The Kynix Blog

ⅠIntroduction A diode is a semiconductor device that functions as a one-way current switch. It allows current to flow freely in one direction while severely limiting current flow in the opposite direction. Because they convert alternating current (ac) to pulsating direct current (dc), diodes are also known as rectifiers (dc). Diodes are classified based on their type, voltage, and current capacity. Diodes have polarity, which is determined by an anode (positive lead) and a cathode (negative lead) (negative lead). Catalog ⅠIntroduction Ⅱ Diode Related Video: Ⅲ How to Tell Which Way Round a Diode Should Be? 3.1 Examining the Markings 3.2 USing a Multimeter Ⅳ How to Check the Direction of a Diode? Ⅴ How to Check if a Diode Is Bad? Ⅵ How to Test a Diode Rectifier? Ⅶ How to Test Diodes with a Digital Multimeter？ 7.1 Diode Test Analysis Ⅷ FAQ     Ⅱ Diode Related Video: Diodes Explained - The basics how diodes work working principle pn junction Diode Video Description: Diodes Explained, in this tutorial we look at how diodes work, where diodes are used, why diodes are used, the different types. We look at diodes in half and full bridge rectifiers to convert AC to DC.   Ⅲ How to Tell Which Way Round a Diode Should Be? A diode is a two-terminal electronic device that conducts current in one direction while blocking current in the other. A diode, also known as a rectifier, is a device that converts alternating current (AC) to direct current (DC). Because diodes are essentially "one-way," it's critical to understand how to tell which end is which. You can usually tell by looking at the markings on the diode, but if they've worn off or don't exist, you can test the diode with a multimeter. 3.1 Examining the Markings     Figure1: P-type   Understand how a diode works. An N-type semiconductor is joined to a P-type semiconductor to form a diode. The N-type semiconductor serves as the negative end of the diode and is referred to as the "cathode." The P-type semiconductor, also known as the "anode," is the diode's positive end. The diode will conduct current if the positive side of a voltage source is connected to the positive end of the diode (the anode) and the negative side is connected to the negative end of the diode (the cathode). The current is blocked if the diode is reversed (up to a limit).   Figure2: schematic symbol   Discover the meaning of the diode schematic symbol. On schematics, diodes are represented by a symbol that explains how to install the diode. An arrow points to a vertical bar with a line extending from it. The arrow represents the diode's positive side, while the vertical bar represents its negative side. Consider the positive side flowing into the negative side, with the arrow indicating the flow direction.   Figure3: large band   Seek out the large band. If the schematic symbol is not printed on it, look for other items such as a ring, band, or line. A bulk of colored bands will be printed near the diode's negative side (cathode) on the majority of diodes. The band will wrap completely around the diode.   Figure4: Recognize the positive end of an LED Recognize the positive end of an LED. An LED is a light-emitting diode, and the legs usually indicate which side is positive. The positive, anode pin is on the longer leg. Examine the LED's outer casing if the pins have been trimmed. The negative, cathode pin is the one closest to the flat edge.     3.2 USing a Multimeter Figure5: Recognize the positive end of an LED Recognize the positive end of an LED. An LED is a light-emitting diode, and the legs usually indicate which side is positive. The positive, anode pin is on the longer leg. Examine the LED's outer casing if the pins have been trimmed. The negative, cathode pin is the one closest to the flat edge.   Figure6: Connect the diode   Connect the diode to the multimeter. Connect the positive lead to the diode's positive end and the negative lead to the diode's negative end. The meter's display should show a reading. If your meter has a Diode mode, the voltage will be displayed on the meter if it is connected positively to positive and negatively to negative. Nothing will be displayed if it is entered incorrectly. If your meter does not have a Diode mode, connecting it positive-to-positive and negative-to-negative will result in very low resistance. If you go the wrong way, you'll encounter a lot of resistance, which is sometimes expressed as "OL."   Figure7: Examine an LED Examine an LED. A light-emitting diode (LED) is a semiconductor that emits light. Set the multimeter to the diode function. Place one of the positive leads on one of the pins and the other on the other. If the LED illuminates, the positive lead is in contact with the positive pin (the anode) and the negative lead is in contact with the negative pin (the cathode). If it doesn't light up, it's because the leads are touching opposite pins.   Ⅳ How to Check the Direction of a Diode? Electronic circuits are designed to collaborate with other circuits to form a unit that performs a specific task. Many circuits, such as power regulation circuits, have to be safeguarded against power "spikes" and accidental polarity reversal. A diode is an electronic component that allows electricity to flow in only one direction while preventing potentially harmful reversals from reaching the sensitive circuit. The current flows into the diode's "cathode" (negative side) and then out the "anode" (positive side) toward the protected circuit. When installing a diode, you must be familiar with electronics standards. Understand the circuit's schematic diagram. Trace the electrical polarity as it passes through the circuit until it reaches the point where the cathode (negative side) of the diode is to be soldered to the board. In a schematic, a diode glyph has a vertical line on one side and a solid black arrow pointing to that line. The diode's cathode is represented by the vertical line. That end of the diode must face the direction of the negative current flow. Examine your diode thoroughly, using a magnifying glass if necessary. On the cathode (negative) end of every diode, there is either a colored dot or a band printed. On the cathode end of a black plastic diode, a white band will be painted, whereas glass diodes will have either a white or a black band. In the absence of polarity markings, use a digital multimeter to test the polarity of a diode. To measure "Ohms," simply turn the meter unit on and turn the dial. Connect the black (negative) test probe to one of the diode's metal legs and the red (positive) test probe to the other. Reverse the probes if there is no reading or only a "1" displayed on the meter. When you get an actual ohm reading on the display, make a note of which side the negative (black) probe is on. That is the diode's cathode (negative) side.   Tips: The small white band on the cathode side of a glass diode may be difficult to see. To make the white band move visible, place the glass diode on a dark piece of paper or fabric if necessary.On some types of diodes, the band colors can vary, but never the positioning. A diode's band is always on the cathode side. The color of the band is unimportant.Additional bands on some specialty diodes, such as Zener diodes, represent tolerance and voltage values. Even so, the polarity band is the first band at the end.   Ⅴ How to Check if a Diode Is Bad? Tools Digital multimeterSoldering ironDesoldering braidPliers     Ⅵ How to Test a Diode Rectifier? Testing a Rectifier With the Diode Function If your multimeter has a diode function, one of the dial settings will have a symbol that looks like a diode. When this option is selected, a voltage exists between the meter leads, and when you touch them to the diode terminals, the meter records the voltage drop. The voltage drop in the forward direction is usually in the range of 0.5 to 0.8 volts. Because no current flows in the opposite direction, the meter either reads 0 or OL, which stands for open loop. To begin the test, ensure that the circuit is unplugged and that all capacitors in the circuit have been discharged. You do not need to remove the diode from the circuit if you do this. Begin by connecting the negative meter lead (usually black) to the cathode of the diode and the positive lead (red) to the anode. Keep a close eye on the meter reading, which should be between 0.5 and 0.8 volts. If it's close to zero, the diode is faulty. Reverse the leads now. If you get a reading of 0 or OL, the diode is fine. If you get nearly the same voltage reading, the diode has shorted and is no longer operational.   Conducting a Diode Test With an Ohmmeter When performing a resistance test, the diode must be removed from the circuit. Before you begin, turn off the power and discharge any capacitors in the circuit. This is especially important when testing a microwave diode because the microwave's high voltage capacitor can cause a severe shock. Set the multimeter to measure resistance () and connect the black (negative) and red (positive) leads to the cathode and anode, respectively. The diode is forward-biased in this configuration, and you should get a resistance reading between 1 K and 10 M. Change the leads to the opposite terminals. Now that the diode has been reverse-biased, the reading should be infinity or OL. If the readings in both directions are the same, the diode is faulty.   Ⅶ How to Test Diodes with a Digital Multimeter？ Figure8: Diode Test mode The Diode Test mode on a multimeter generates a low voltage between the test leads. When the test leads are connected across a forward-biased diode, the multimeter displays the voltage drop. The Diode Test is carried out as follows: Ascertain that a) all power to the circuit is turned off and b) there is no voltage at the diode. Voltage may exist in the circuit as a result of charged capacitors. If this is the case, the capacitors must be discharged. Set the multimeter to measure alternating current or direct current voltage as needed.Set the dial (rotary switch) to Diode Test. It may share a dial position with another function.Connect the diode's test leads. Take note of the displayed measurement.The test leads should be reversed. Take note of the displayed measurement.   7.1 Diode Test Analysis For the most commonly used silicon diodes, a good forward-based diode has a voltage drop of 0.5 to 0.8 volts. The voltage drop in some germanium diodes ranges from 0.2 to 0.3 V. When a good diode is reverse-biased, the multimeter displays OL. The OL value indicates that the diode is operating as an open switch. A faulty (opened) diode prevents current from flowing in either direction. When the diode is opened, a multimeter will show OL in both directions. In both directions, a shorted diode has the same voltage drop reading (approximately 0.4 V). Figure9: Diode test analysis When the positive (red) test lead is on the anode and the negative (black) test lead is on the cathode, the diode is forward biased. A good diode's forward-biased resistance should be between 1000 and 10 M. When the diode is forward-biased, the resistance measurement is high because the current from the multimeter flows through the diode, resulting in the high-resistance measurement required for testing. When the positive (red) test lead is on the cathode and the negative (black) test lead is on the anode, the diode is reverse-biased. On a multimeter, the reverse-biased resistance of a good diode displays OL. If the readings in both directions are the same, the diode is faulty. Figure10: resistance   The resistance mode procedure is conducted as follows: Ascertain that a) all power to the circuit is turned off and b) there is no voltage at the diode. Voltage may exist in the circuit as a result of charged capacitors. If this is the case, the capacitors must be discharged. Set the multimeter to measure alternating current or direct current voltage as needed.Set the dial to Resistance (). It may share a dial position with another function.After the diode has been removed from the circuit, connect the test leads to it. Take note of the displayed measurement.The test leads should be reversed. Take note of the displayed measurement.When testing diodes in the Resistance mode, compare the readings to a known good diode for the best results.   Ⅷ FAQ 1. What are the 3 main uses of diodes? Application of Diode Rectifying a voltage: turning AC into DC voltages.Drawing signals from a supply.Controlling the size of a signal.Mixing (multiplexing) signals.As freewheeling of the inductive energy. 2. Are diodes AC or DC? It allows current to flow easily in one direction, but severely restricts current from flowing in the opposite direction. Diodes are also known as rectifiers because they change alternating current (ac) into pulsating direct current (dc). 3. What is diode made of? Today, most diodes are made of silicon, but other semiconducting materials such as gallium arsenide and germanium are also used. 4. What is diode resistant? Hence, diode resistance can be defined as the effective opposition offered by the diode to the flow of current through it. ... Ideally speaking, a diode is expected to offer zero resistance when forward biased and infinite resistance when reverse biased. 5. How diodes are formed? A diode is formed by joining two equivalently doped P-Type and N-Type semiconductor. ... At the point of contact of the P-Type and N-Type regions, the holes in the P-Type attract electrons in the N-Type material. Hence the electron diffuses and occupies the holes in the P-Type material.

IntroductionIn the era of smart phones, there are two ways to extend battery life, one is to directly use a large-capacity battery, and another is to use quick charge technology. Using large-capacity batteries is a easy way but with bulky piece of phones. Here let’s talk about the quick charge. How can you make the phone charge faster?How Does Fast Charging Work?CatalogIntroductionⅠ Quick Charge FactorsⅡ Battery Charging Basics2.1 Charging Heat2.2 Charging PowerⅢ Quick Charge Development3.1 USB Battery Charge 1.23.2 Qualcomm Quick Charge3.3 OPPO VOOC Charge3.4 Pump Express (PE)3.5 OnePlus Dash Charge3.6 Huawei SuperCharge3.7 Low Voltage Solution3.8 Quick Charge AgreementⅣ FAQ Ⅰ Quick Charge FactorsTo realize the quick charging function on the mobile phone, three elements need to be met: Charger, Battery, Charge IC. Adding a point, the charger needs to meet sufficient output current and voltage, because the wiring of the charger has a large parasitic resistance. If requiring a larger charging current, the on-load output voltage of the charger needs to be higher.Quick charge tech of smartphones is mainly divided into three categories: VOOC flash charge, Qualcomm Quick Charge 2.0, and MediaTek Pump Express Plus.At present, the mainstream modes of quick charge on the market include three modes: High voltage and constant currentLow voltage and high currentHigh voltage and high currentFigure 1. Fast ChargingⅡ Battery Charging Basics2.1 Charging HeatHow does the battery charge and solve the heat?Figure 2. Heating Up While ChargingThe basic condition for battery charging is that the charger voltage must be higher than the battery voltage to generate a charging current and complete the charge transfer process. At present, most of the batteries of mobile phones are composed of single lithium or multiple lithium. Generally, the working voltage of mobile phone batteries is about 3.3V~4.2V. During discharge, the voltage will drop, so the average voltage is about 3.7V-3.8V.When charging, the electric energy enters the mobile phone and is processed by the step-down circuit in the mobile phone, and then outputs a voltage of about 3.3~4.5V to charge the battery. And this voltage drop process is responsible for the charge management IC module in the mobile phone. It is responsible for converting the current output by the power supply into a current through the battery. In this process, there will be a certain loss, which will be transferred out of heat.2.2 Charging PowerIn the case of a certain battery level, power indicates the charging speed, the higher the power, the faster the charging speed.Power (P) = voltage (V) x current (I)In theory, increasing the current and voltage can higher the charging power of the battery, but lithium batteries are prone to battery damage or deflagration due to undervoltage or overvoltage. Thus mobile phones must be equipped with a complete power circuit. Among them, the charging control IC and the power control IC are the most important. Ⅲ Quick Charge DevelopmentAccording to theory, quick charge adjust the input value of the voltage and current, thereby shorten the charging time of the mobile phone. Next, let us take a look at the development history of it.The charging standard of mobile phones can be traced back to the era of feature phones, which can be started from the charging standard USB BC 1.2 (BC is the abbreviation of Battery Charge).3.1 USB Battery Charge 1.2The USB specification was first introduced in 1995. It was developed by USB Implement Forum (USB IF), including Intel, NEC Corporation, Compaq, DEC (American Digital Equipment Corporation), IBM (International Business Machines Corporation), Microsoft, and Northern Telecom.The USB BC1.2 standard was published by the USB IF in 2010. It refers to the ability to directly charge the battery of a portable device, and has become a key standard for establishing the correct way to charge the battery through the USB port. So BC1.2 is a set of official standards that can use USB interface to charge portable devices like mobile phones (including power-off charging). Here you may ask, what is the relationship between the USB specification protocol and fast charging?The emergence of USB BC 1.2 makes simultaneous charging and data transmission a reality. Although the USB interface was originally used by manufacturers to transfer data and connect devices such as keyboard or mouse instead of charging. Just think, wouldn't it be much more convenient if you can use the USB interface to charge these devices? So USB BC 1.2 came into being. Although the maximum voltage of the USB interface was still 5V at that time, and the maximum current of USB charging is 1.5A. Although it did not increase the voltage (mainly to adapt to other portable devices), but the USB interface can reach 7.5W with 1.5A current. At that time, the USB BC 1.2 is enough to cope with the charging of mobile phones.The emergence of USB BC 1.2 not only ended the chaotic scenes of USB charging specifications at that time, but it also has good support for hubs/distributors/HUB. So the USB interface data line has become the hot product of various manufacturers for a while. But there is also a data cable with a MicroUSB 2.0 interface (also known as the Android cable). It has only four wires inside, and its current carrying capacity is very limited (2A is the max).Although the USB BC 1.2 standard was able to meet the charging needs of mobile phones at the time, the development of mobile phones has not stopped. With the time goes by, mobile phones have more and more functions. In order to cope with daily use, the battery capacity has also become larger and larger, and the battery capacity has also exceeded 2000mAh, but with the extension of the charging time. When the cell phone battery capacity reaches 3000mAh or even 4000mAh, does it have to be charged overnight? So the charging speed again meets forward higher requirements.3.2 Qualcomm Quick ChargeIn 2013, it was the chip supplier Qualcomm who discovered this problem. Qualcomm first put forward the concept of "Fast Charge", and Quick Charge 1.0 was born. Improve the charging efficiency by increasing the input current, support 5V/2A, that is, the maximum charging power of 10W, breaking through the 1.5A current upper limit of the USB Battery Charge 1.2. In the same year, Huawei also introduced the "fast charge" concept to the first generation of Mate phones, which also supports 5V/2A input, and can fully charge a 4050mAh battery within 3.5 hours.In 2014, the situation was a little different. Qualcomm overturned the QC1.0 strategy and adopted a high-voltage quick charging solution.As mentioned above, P (power) = V (voltage) * I (current), because the data line of MicroUSB 2.0 can only support up to 2A current. Since it couldn’t to increase the current at that time, only adjust the voltage. For example, a fast charge with 18W power, if you want to use a 5V voltage, the current has exceeded 3A. A normal MicroUSB can never withstand such a high current. Using a voltage of 12V, the current only needs 1.5A, so the problems had be solved.The big advantage of this high-voltage fast charging tech is that the cost is relatively low (no need to buy different data cables), and the disadvantages are also obvious. The voltage of the charger is suddenly increased to twice as much, and the step-down heat is also extremely large for the mobile phone. So a major shortcoming of high-voltage quick charge is that the mobile phone generates serious heat during charging.This fast charging solution is the high-voltage QC2.0. It is the most popular and influential standard in the history of QC. For example, Samsung’s 2018 flagship Galaxy S9 still uses the QC2.0.Figure 3. Qualcomm Quick ChargeQC2.0 has improved the charging voltage from the conventional 5V that has been maintained for many years to 9V/12V/20V. It achieves 18W high-power power transmission at the same 2A current as QC1.0, and does not require special wires.QC2.0 has far-reaching influence because of its powerful compatibility. At that time, Micro USB was the standard configuration of smart phones, but it was restricted by the physical interface. Once the current exceeds 2A, it is prone to damage. The smart part of QC2.0 bypasses the restrictions of the Micro USB interface and the data cable, and only increases the charging speed by directly adjusting the input voltage. What’s more, QC2.0 quick charge tech has given peers a idea for reference.3.3 OPPO VOOC ChargeFor example, OPPO introduced VOOC (Voltage Open Loop Multi-step Constant-Current Charging). What OPPO uses here is another solution. There is a fact that normal MicroUSB data cable can't carry such a large current. Because the usual MicroUSB data cable has only five measuring points and four wires, so just increase their number. Therefore, the original VOOC charging head is extremely big because of integrates IC circuit.In addition, because the circuit is rebuilt, you can only use the official special data cable, and the ordinary MicroUSB data cable cannot achieve the fast charging effect. The shortcoming is obvious that the cost is high. But the biggest problem is that high-current charging has more damages. For example, it has been shortening the battery service life of many mobile phones because of VOOC quick charge a year later.Following the principle of "equivalent exchange", since such a heavy price has been paid, there will certainly be generous returns. The advantage of the first-generation VOOC fast charge is that with the 5V/5A 25W ultra-high power, OPPO mobile phones equipped with VOOC fast charge are extremely fast in charging speed. And it puts the heat source into the charger externally, and the heat generated by the mobile phone during charging is significantly less than that of the high-voltage fast charging solution. As a result, the high-voltage fast charging solution led by Qualcomm QC and the low-voltage and high-current fast charging solution led by OPPO VOOC have parted ways.VersionLaunch TimeVoltage/CurrentDescriptionVOOC 2.020155V/4ASame as the first versionVOOC 3.020195V/5ACharge the phone up to 55% in 30 minutesVOOC 4.0202010V/5A(50W)Charge the phone up to 67% in 30 minutesSuperVOOC20185V/6A (30W)Charge a two-cell battery in seriesSuperVOOC 2.0202010V/6.5A (65W)Successor of Super VOOC with GaN technologyThe key to fast charging of mobile phones is the small micro USB interface. At this time, USB type-C appears. Simply list its advantages, such as: support positive and negative plug compatibility, compatible with USB 3.1 standards, support 10Gbit/s transmission in maximum, support the USB Power Delivery charging protocol, support 5A current, the maximum can provide 100W of power. Therefore, the Type-C interface is inherently friendly to large currents.Qualcomm is a giant in mobile phone chips and communications patents, and by virtue of its dominant position, it can quickly popularize its fast charging standards to gain the standard license fee. However, various manufacturers have also begun to develop their own fast charging standards to share this big cake.3.4 Pump Express (PE)Also in 2014, MediaTek launched its own Pump Express (PE) quick charge tech, and Meizu's mCharge fast charging is based on this, and the later Pump Express Plus (PEP) fast charging. Huawei launched the Fast Charge Protocol (FSP) in the early days. As for Xiaomi and Nubia, many manufacturers that still use Qualcomm QC for their flagship mobile phones. They belong to high-voltage fast charging scheme.3.5 OnePlus Dash ChargeNext, let’s talk about OnePlus. Although OnePlus uses Qualcomm’s SoC, but chose a low-voltage and high-current charging solution, that is, Dash charge. It first debuted with the launch of OnePlus 3, where OnePlus promised 60% of full charge in just 30 minutes of charging.Seeing this, do you think that Qualcomm's high-voltage fast charging solution has won the victory, while the low-voltage solution can survive hardly?Of course not, the turning point is that more and more mobile phones are equipped with USB Type-C interface. By 2016, it has become popular. For example, Android flagship phones basically use this interface.3.6 Huawei SuperChargeIn the same year, Huawei improved its FastCharge (FCP) to SuperCharge (SCP). SCP can be said to be one of the fastest/good compatible fast charging representatives in the world, and is compatible with PD and Qualcomm QC protocols.3.7 Low Voltage SolutionMediaTek has also switched to a low-voltage solution. Pump Express technology has developed to 3.0. Pump Express 3.0 is the world's first fast charging solution that uses Type-C interface for direct charging. This solution can effectively prevent the phone from getting hot during charging. In a word, it is very safe.In 2017, Meizu released Super mCharge quick charge tech. It has a charging power of up to 55W at 11V/5A. Unfortunately, due to the inability to get mass production, this 55w super fast charge is still not applied to mobile phones, and replaced by MCharge4.0 fast charging technology. The earlier mCharge3.0 is a high-voltage fast charging solution (24W), and its charger output voltage can reach up to 12V; while mCharge4.0 (25W) belongs to low-voltage and high-current solution, with 5V output voltage and 5A current.Qualcomm began to discover the advantages of the low-voltage solution, so it uses the low voltage and high current solution in the QC4.0 fast charging protocol. Of course, it also supports high voltage fast charging at the same time.Although low-voltage and high-current solutions have basically ruled fast charging, the fast charging protocols of various companies are not compatible with each other. That is to say, although they all use Type-C, they must use the fast charging function of mobile phones corresponding to their own agreement. In other words, although they are all Type-C interfaces, the fast charge protocol is different.3.8 Quick Charge StandardFortunately, the USB IF has unified the fast charging standard. Mobile phones should employ fast charge according to the USB PD protocol. Adjust voltage and current. This standard is also supported by Google. However, various manufacturers make their own mobile phones, and use their own fast charging protocols. So the USB PD protocol has been put aside.The main reasons why mobile phone manufacturers have become more obsessed with constant voltage and high current over the years are: greater power and less charging heat. The USB PD3.0 has successfully incorporated Qualcomm's QC4 protocol. So far, USB PD3.0 has been the regular rule. In short, manufacturers who want to continue to develop their own charging technology, they only need to be based on the USB PD protocol. Moreover, the latest 100W fast charge has been successfully tested. Although large-scale commercial use is unlikely right now, the technical bottleneck will always be overcome.Every Fast Charging Standard Explained Ⅳ FAQ1. What is considered quick charge?For fast charging, you're looking at something that bumps the voltage up 5V, 9V, 12V, and beyond, or increases amperage to 3A and above. Keep in mind, your device will only take in as much power as its charging circuit is designed for.2. Does Quick Charge work with any cable?Do I need any specific equipment for fast charge? Fast charge requires 3 components – a compatible phone/tablet/laptop or other device, a charger that supports USB Fast charge, and a compatible cable. The cable will have USB-C at least on the charger end, and either USB-C or Apple Lightning on the device end.3. Is fast charging bad?The bottom line is, fast charging won't impact your battery life substantially. But the physics behind the technology means you shouldn't expect the battery to last longer than using a conventional “slow” charging brick.4. What phones use quick charge?Apple, Samsung, Google, OnePlus, LG, Sony, Motorola, Huawei, Xiaomi, OPPO, ViVo and Realme.5. What is the meaning of VOOC?The OPPO VOOC (Voltage Open Loop Multi-step Constant-Current Charging) Flash Charging system is a proprietary rapid-charge technology created by OPPO Electronics, which, at present, is able to charge certain OPPO devices from 0 to 75% in just 30 minutes.6. Which phones support VOOC?Realme Narzo 20 Pro (65W Dart Charging)Realme 7 (30W Dart Charging)Realme 7i (18W)Realme 6 (30W VOOC fast charging)Realme X2 (30W VOOC fast charging)7. What is difference between Dash and Warp Charge?The key difference in the two standards is the increase in wattage on the Warp Charge standard. ... In comparison, Dash Charge uses a 5V / 4A (20W) configuration, and both require dedicated Warp Charge / Dash Charge compatible cables to carry the energy.8. Can you use Dash charge with other phones?Dash charge won't harm the phone.. Yes it can. I don't think OnePlus' type C cables or charger are up to USB Type C specifications. I would advise to not do it and get the proper cables and charger for your other device.9. How fast is Huawei SuperCharge?46 mAh per minuteAn infographic put together by Hometop shows that Huawei Super Charge is the fastest at over 46 mAh per minute.10. What is MediaTek Pump Express?Pump Express 4.0 is the latest advance in MediaTek's family of charging innovations. This next-generation charging technology will change your (battery) life, cutting smartphone battery recharge times by over half, compared to a standard USB charger.11. What is MediaTek Pump Express 2.0?They use the MediaTek Pump Express 2.0 fast charging technology and reach a 35% (1,785mAh) in just 30 minutes giving several hours use. It can fully charge the huge battery via its USB-C connector from 0-100% to give 2 full days use in just 2.5 hrs.12. What is super flash charge?The company introduced its 65W SuperVOOC charging that can charge 4000mAh battery on the Reno Ace / Ace2 fully in about 30 minutes. ... The company's 125W fast charging is rumoured to charge the phone's battery from 0 to 100% in about 10 minutes.13. What is DART charge Realme?The Realme 30W Dart Charge Power Bank is an easy recommendation from our side for anyone who owns a compatible device. It comes with two-way fast charging and support for multiple quick charge protocol support. The power bank is also compatible with multiple smartphones apart from Realme.

Ⅰ IntroductionBNC connectors have a bayonet-style coupling mechanism that allows for quick connection and disconnects while also providing positive locking. Mating takes only a quarter-turn of the coupling nut. BNC RF connectors have a classic, dependable design that allows them to accommodate a wide range of RG and industry-standard coaxial cables in a variety of termination styles.catalogⅠ IntroductionⅡ What is a BNC Connector?Ⅲ BNC Connector Related Video:Ⅳ BNC Connector Features and BenefitsⅤ BNC Connector ApplicationsⅥ Related ProductsⅦ 75 ohm vs 50 ohm7.1 Applications7.2 50 Ohm and 75 Ohm Cables: Differences / Distinctions7.3 Why 50 Ohm and 75 Ohm?7.4 SpecificationsⅧ Other Types of BNC ConnectorⅪ SDI vs BNC9.1 Definition: SDI vs. BNC Cables9.2 BNC Connectors on SDIⅩ FAQ Ⅱ What is a BNC Connector?Paul Neill of Bell Labs and Carl Concelman of Amphenol created The Bayonet Neill Concelman (BNC) connector. The original purpose of the BNC connector was for military applications, but it is now primarily used in the broadcast market. This connector has evolved to keep up with the changing industry landscape, and it now provides the 12G SDI performance required in 4K and Ultra-HD applications. BNC connector types for coaxial cable have been widely adopted and continue to be a popular choice for current and next-generation video technology. Ⅲ BNC Connector Related Video: BNC Connector Video Descirption: This short video demonstrates how to connect a crimp style BNC connector to RG-58 50-ohm coax. Other crimp-style coaxial connectors will be installed in a similar manner. It should be noted that the connectors are specific to the type of coax being used, and having the proper crimping tool is necessary. Optionally (carefully) solder the center pin, and finish with heat shrink tubing for a clean professional look. Ⅳ BNC Connector Features and BenefitsCustomers can match impedance to system requirements using the bayonet coupling mechanism, which provides positive, quick mating and un-mating. 50 and 75 ohm impedance designs are available.Military, industrial, and commercial connectors are available.Many common BNC coaxial cable designs are available.Female and male BNC configurations Ⅴ BNC Connector ApplicationsAntennasBroadcast (75 Ω)TelecommunicationsAutomotiveComputers/LANsMedical EquipmentSatcomBase StationsCable ModemsInstrumentationMilitary/Aerospace Ⅵ Related Products                                                                       BNC Adapters                                                         BNC Accessories                                 BNC Cable Assemblies Ⅶ 75 ohm vs 50 ohmBNC connectors are typically available in 50 ohms and 75-ohm versions, which are matched for use with cables of the same characteristic impedance. The 75-ohm connector is slightly different in dimensions from the 50-ohm variant, but the two can be made to mate.BNC cables and connectors are available in 50 Ohm and 75 Ohm specifications.ohm cables/connectors are designed for high-quality digital video (CCTV) and can scale their output based on the input.75-ohm cables can also be used effectively on older analog video formats, making them more versatile and flexible in any situation.When low signal loss is critical, 75 Ohm BNC cables/connectors are used.50-ohm cables and connectors are compatible with older analog video formats. If you are looking for high-quality video output, 50 Ohm will not provide it.Connecting the two types of connectors is possible, but it is not recommended: mixing will not result in the best output.With 50 Ohm cables, 50 Ohm BNC connectors are used. With 75 Ohm cables, 75 Ohm connectors are used. 7.1 Applications75 Ohm BNC applications include satellite, high-definition televisions, and cable TV receiver boxes.Receivers for AM/FM radio.Police scanners. RG-179 coaxial cable has a 75 Ohm BNC connector and is used in high-temperature environments.Applications of 75 Ohm BNC Cables using RG-179A 75 Ohm BNC connector is used on the RG-179 coaxial cable.Is designed specifically for high-temperature environments: Finished with a TFE taped outer jacket. It can withstand temperatures of up to 200 degrees Celsius.RG-179 is commonly used in high-temperature applications such as:Hospital and clinic medical equipmentVideo surveillance cameras are applied for safety purposes.Audio surveillance systems.  7.2 50 Ohm and 75 Ohm Cables: Differences / DistinctionsThe impedance of 50 Ohm and 75 Ohm coaxial cables is measured in Ohms, the unit that measures electrical resistance. The radio frequency signals sent down these cables are alternating current (AC) rather than direct current (DC) (DC). The magnitude and phase of the transmitted signal are countered and contained by the cable as it flows down its length with AC signals. As a result, the impedance rating for coaxial cable is as follows:Resistance: the amount of resistance to current flow.The amount of voltage generated by the magnetic field of an electrical current is referred to as inductance.Capacitance is the amount of charge contained or retained within a cable while current flows.Coaxial cable is designed specifically for signal transmission and is structured to balance resistance, capacitance, and inductance for consistent performance in radio frequency circuits. The impedance of a specific coaxial cable is determined by its composition, which includes the dielectric constant of the insulating layer and the radii of the outer and inner conductors. 7.3 Why 50 Ohm and 75 Ohm?For most radio frequency applications, the use of 50 and 75 Ohms as standard characteristic impedances for coaxial cable is essentially a compromise between optimal power handling and the lowest possible signal loss. These critical impedances were discovered through extensive testing in the early twentieth century. These experiments discovered that, while 30 Ohm cable provided excellent voltage and power handling, 77 Ohm coax provided the lowest attenuation.As a result, 50 Ohm coaxial cable would have a good power handling profile as well as low attenuation. Over the following decades, 50 Ohm coax emerged as the primary solution for cable with good power handling, particularly for 100 watts or more. It is frequently used for antenna cables in amateur and broadcast radio, cellular and wireless networking applications involving transmitters and transceivers.For applications requiring low signal loss, capacitance, and signal distortion, 75 Ohm cable was preferred. It is the coaxial cable of choice for applications requiring efficient signal transfer with low loss. These cables are frequently used in applications that require a connection to a receiver, primarily video applications that are low power and do not require the power handling of a 50 Ohm cable. Cable television, HDTV, and CCTV are examples of important applications. 75 Ohm coax can also be used for coaxial digital audio, allowing it to transfer audio, for example, in a home theater system. 7.4 SpecificationsElectrical50 Ohm75 OhmImpedance50 Ohm75 OhmFrequency RangeDC - 4 GHz (DC -12 GHz on Extended Range Designs)DC- 4 GHz (DC - 12 GHz on Extended Range Designs)Voltage Rating500 Volts RMS Max Continuous500 Volts RMS Max ContinuousDielectric Withstanding Voltage1500 VRMS Max1500 VRMS MaxVSWR (Return Loss)       DC - 4 GHz1.3 (-18 dB) Max1.5 (-14 dB) Max     12G Products: DC - 6 GHz 1.22 (-20 dB) Max     12G Products: 6 - 12 GHz 1.43 (-15 dB) MaxInsulation Resistance 5000 MΩ Min5000 MΩ MinCenter Contact Resistance1.5 mΩ Min1.5 mΩ MinOuter Contact Resistance0.2 mΩ Min0.2 mΩ MinRF Leakage55 dB Max @ 3 GHz55 dB Max @ 3 GHzInsertion Loss0.2 dB Max @ 3 GHz0.2 dB Max @ 3 GHzPower Handling316 W Max @ 1 GHz @ 25 ºC316 W Max @ 1 GHz @ 25ºCEvironmental  Temperature Range−65°C to +165°C−65°C to +165°CThermal ShockMIL-STD-202, Method 107 (Test Condition G), except high temp test @ +200⁰CMIL-STD-202, Method 107 (Test Condition G), except high temp test @ +200⁰CCorrosionMIL-STD-202, Method 101 (Test Condition B) - 5% Salt SolutionMIL-STD-202, Method 101 (Test Condition B) - 5% Salt SolutionVibrationMIL-STD-202, Method 204 (Test Condition D)MIL-STD-202, Method 204 (Test Condition D)Mechanical ShockMIL-STD-202, Method 213 (Test Condition G) - No Discontinuity PermittedMIL-STD-202, Method 213 (Test Condition G) - No Discontinuity PermittedMoisture ResistanceMIL-STD-202, Method 106MIL-STD-202, Method 106AltitudeMIL-STD-202 Method 105 (Test Condition C)MIL-STD-202 Method 105 (Test Condition C)Mechanical  Mating Cycles500 Min500 MinCoupling MechanismBayonetBayonetInterface SpecificationMIL-STD-348MIL-STD-348    Ⅷ Other Types of BNC ConnectorThere is also a threaded version of the BNC connector known as the TNC connector (Threaded Neil-councilman). The connector has a 50 impedance and works best in the frequency range of 0–11 GHz. When it comes to microwave frequencies, it outperforms the BNC connector. 50-OHM Twin BNC or twinaxTwin BNC (also known as Twinax) connectors have the same bayonet latching shell as regular BNC connectors but have two independent contact points (one male and one female), allowing the connection of a 78 ohm or 95 ohms shielded differential pair such as RG-108A.They have a maximum frequency of 100 MHz and a voltage of 100 volts. They are incompatible with standard BNC connectors. Twinax connectors are ideal for computer network applications because they feature keyway polarization, which ensures system integrity and prevents signals from being mixed.Twin BNC TriaxialTriaxial (or Triax) connectors are a type of BNC connector that carries a signal, a guard, and a ground conductor. Triax connectors are used in applications that require maximum RF shielding and minimal noise radiation. These are used in sensitive electronic measurement systems such as Keithley Instruments. Early triaxial connectors had only an extra inner conductor, but later triaxial connectors have a three-lug arrangement to prevent accidental forced mating with a BNC connector. Adaptors are available to allow some interconnection between triaxial and BNC connectors.Triaxial  Miniature connectorsMini BNC and High-Density BNC are smaller versions of the BNC connector (HD BNC). While retaining the original electrical specifications, they have smaller footprints, allowing for greater packing density on circuit boards and equipment backplanes. Because of their true 75 ohm impedance, these connectors are suitable for HD video applications. These BNC connectors are widely used in electronics, but in some applications, they are being replaced by LEMO-00 miniature connectors, which allow for much higher densities. For higher density products in the video broadcast industry, the DIN 1.0/2.3 and HD-BNC connectors are used. Miniature connectorsⅪ SDI vs BNC9.1 Definition: SDI vs. BNC CablesBayonet or BNC? Neil Concelman connectors are commonly found on coaxial cables. Male-type connectors are attached to the ends of basic BNC cables. It has a pin that connects to the cable conductor in the center.The rotating ring on the outside of the BNC cable tube is capable of locking to female connectors. This type of connector is commonly found on monitors. It aims to improve the accuracy of signals, particularly those sent by the video adapter.Two HD SDI-video cablesSDI, or Serial Digital Interface, on the other hand, is commonly used to transmit uncompressed and unencrypted video signals. This interface type is also used for broadcasting standard and high definition signals. These can be accompanied by audio and video signals.This interface type is primarily used by broadcasting facilities. It also includes closed captions, test signals, and content identification. 9.2 BNC Connectors on SDISDI is a signal transport format, whereas BNC is a connector format. SDI employs coaxial cables, which are typically terminated with a BNC plug.SDI transports 16 channels of pulse-code modulation (PCM) audio and uncompressed digital video. It transmits over a 75 Ohm coaxial cable with a BNC connector.SDI cables can no longer handle signals with bandwidths in the gigahertz range. To handle this digital signal, it must use a proper BNC connector. BNC connectors, on the other hand, can come in a variety of sizes. As a result, we recommend that you locate a BNC connector that is compatible with SDI.Despite its utility, the main disadvantage of using SDI is that it is not supported by a large number of consumer and prosumer devices. Despite this, some manufacturers use converter boxes to convert SDI signals. SDI has a limited number of resolutions that it can support.In general, a supporting BNC connector on your SDI cable is required to allow for greater signal bandwidth. Furthermore, the majority of users connect these two connectors by soldering or securing the locks.In summary, various types of equipment, such as radios and televisions, use BNC coaxial cable connectors. The connector has a single pin in the center. Furthermore, SDI makes use of this cable to accommodate signals that require a large amount of bandwidth. This interface is used by a variety of devices to transmit uncompressed or unencrypted digital signals.SDI alone is not recommended because signals with high bandwidth require a BC connector. As a result, because there are different dimensions for this type, it is critical to find a proper fit of the BNC connector to SDI.Ⅹ FAQ1. What does BNC stand for in connectors?Bayonet Neill–ConcelmanThe BNC (Bayonet Neill–Concelman) connector is a miniature quick connect / disconnect radio frequency connector used for coaxial cable. It features two bayonet lugs on the female connector; mating is fully achieved with a quarter turn of the coupling nut.2. What is the difference between BNC and F connector?BNC connectors are bayonet type connectors, commonly used in CCTV systems. They are the most suitable connector for use with RG59/U cable. ... F-Type connectors are used for CATV, SATV and Digital TV in conjunction with either RG6 or RG11 cables.3. What is BNC?(Bayonet Nut Coupling) A commonly used plug and socket for audio, video and networking applications that provides a tight connection. Using a mount somewhat similar to the way a bayonet (knife) is mounted onto the end of a rifle, BNCs are used to connect a variety of different coaxial cable types.4. Is BNC a media connector?BNC connectors are associated with coaxial media and 10Base2 networks. BNC connectors are not as common as they once were, but still are used on some networks, older network cards, and older hubs. Common BNC connectors include a barrel connector, T-connector, and terminators.5. Are BNC connectors still used?You might remember the BNC connector that was used for component connections in the 2000s and before. It has been used for SD video and HD video, but it's rarely seen in consumer electronics today. ... While N-connectors are still around, the C connector is no longer used.BNC connectors—or Bayonet Neill-Concelman—are a common type of RF connector that utilizes BNC cables. ... A BNC connector connects the analog video components from the camera to a TV monitor or DVR. It snaps firmly into place, providing for a quality and secure connection.

ⅠIntroduction The function of automotive fuses is to protect vehicle wiring and electrical equipment. They are generally rated for circuits with a maximum direct current of 32 volts, but some types are rated for 42-volt electrical systems. They are applied in non-automotive electrical products on occasion. Automotive fuses are typically housed within the vehicle in one or more fuse boxes (also known as an integrated power module (IPM)), typically on one side of the engine compartment and/or under the dash near the steering wheel. In this article, we will explain some items of car fuse.   Catalog ⅠIntroduction Ⅱ What is a Car Fuse? Ⅲ Car Fuse Related Video Ⅳ How a Car Fuse Works? Ⅴ Car Fuse Sizes Ⅵ Types of Car Fuses Ⅶ How to Inspect Car Fuses? 7.1 How to tell if a Car Fuse is blown? Ⅷ How to Replace a Car Fuse? 8.1 Locate Your Car Fuse 8.2  Remove a Car Fuse Ⅸ How to Change a Car Fuse Step by Step? Ⅹ FAQ   Ⅱ What is a Car Fuse? Car fuses are components that protect the electrical wiring in automobiles and trucks. They protect against overcurrent and short-circuiting by disconnecting the circuit if a potentially dangerous level of current occurred. They are considered automotive fuses. There are several types and sizes available, each best suited to specific applications and electrical equipment within a vehicle. The majority of modern car fuses are blade-type fuses. It means they have a similar appearance, with a colored plastic body and two prongs that fit into the socket. Depending on the application, they can be installed in fuse blocks, fuse clips, or fuse holders.   Ⅲ Car Fuse Related Video Your Car's Fuse Box Explained: Everything You Need to Know About The Stuff In Fuse Boxes!   Car Fuse Video Description: Your car's fuse box is not just filled with fuses! The fuse box contains relays, diodes, many different types of fuses, and more components that serve the electrical system and protect it from damage.   Ⅳ How a Car Fuse Works? A modern car's fuse box contains a slew of multi-colored electrical fuses as well as larger, plastic boxes known as relays. Fuses are installed on all of your car's electrical circuits to protect components from power surges. If the current flowing is exceeded ， the fuse will blow, interrupting the circuit and stopping the flow of electricity, protecting the components further down the circuit. Relays are remote switches that allow an electrical circuit to be opened or closed. For example, the headlight switch that turns your headlights on and off requires only a small amount of electricity. When you turn on the switch, instead of sending power directly to the headlights, it activates a relay, which sends a large amount of power to the headlights.   Ⅴ Car Fuse Sizes There are six basic types of automotive blade fuses. They are as follows: Micro2 – the smallest type, distinguished by its tall, thin shape.Micro3 – These are easily distinguished because they are the only type with three terminals rather than two.Minis with a low profile – these are small and compact. The terminals do not protrude far from the main fuse body.Mini fuses have the same body design as low-profile mini fuses, with the main difference being that the terminals are much longer.Regular - these are the most common versions, as well as the second-largest type.Maxi – The largest size available, these are intended for high current applications.   Ⅵ Types of Car Fuses In order to determine the type of fuse used in your vehicle, you will most likely need to inspect the fuse box located inside the vehicle. Certain fuse types, on the other hand, are common to certain vehicles. The following are the most common fuse types found in automobiles. Blade Type Fuses If you own a car built after 1986, it most likely has blade fuses. The plastic body and two metal prongs of these fuses make them easily identifiable. Although nearly all gasoline-powered vehicles use a blade fuse, they are available in six different sizes with current ratings ranging from 1 amp to 100 amps.   Figure1： Blade Type Fuses Bosch Fuses Bosch fuses are commonly found in older European vehicles. The conical ends and physical dimension size of 625mm distinguish a Bosch fuse. These fuses are also known as 6AC fuses, GBC fuses, and Torpedo fuses. The fuse's color indicates the ampere rating, which adheres to DIN 72581/1 standards. If you own a car from the 1980s or earlier, it may have a Bosch fuse. Figure2：Bosch Fuses   Glass Tube Type Fuses Up until 1986, a variety of tube type (cylindrical) glass fuses were commonly used in the manufacture of automobiles in the United States. The majority of these fuses were 1/4 inch in diameter but varied in length and were labeled with the AG suffix for 'automotive glass,' for example, 1AG, 3AG, 7AG, 8AG, SFE fuses, and so on. These glass fuses were typically available in 1A to 30A ratings. Glass Tube Fuses are still manufactured for a variety of different applications, despite the fact that they are no longer commonly used in vehicles. If you own a car manufactured in Northern America in 1986 or earlier, it may have a Glass Tube Type Fuse. Figure3：Glass Tube Type Fuses   Lucas Fuses Lucas Fuses are commonly found in older vehicles assembled or manufactured in the United Kingdom. Lucas Type Fuses are available in both ceramic and glass tube varieties. The ceramic fuse is easily distinguished by its canonical ends and measures 1 or 1.25 inches in length. When compared to American Glass Tube Fuses, Lucas Glass Tube Fuses have different diameter sizes. Many Lucas Fuse Holders, however, can accommodate their American Glass Tube Fuse counterparts. If you own a 1986 or earlier British model car, or a car assembled in Britain, and the fuse type is ceramic, you may need to look for a Lucas Fuse. Figure4：Lucas Fuses   Ⅶ How to Inspect Car Fuses? Car fuses are single-use and should not need to be replaced unless they have blown. As a result, regular maintenance is rarely required, and in most cases, a simple visual check will suffice to determine whether or not the fuse is still in good working order. When a fuse blows or breaks, the wire is disconnected, and it is usually obvious that the continuous connection has broken or melted. When a visual inspection is not possible or additional confirmation is required, you can use a multimeter to check the fuse's status. This can be accomplished in one of two ways: Simply place the probes on either end of the fuse while the multimeter is in continuity mode. It enables the device to perform an electrical test and determine whether the fuse has continuity throughout. If the multimeter shows a high resistance or an error message (depending on the type of multimeter), the fuse is most likely not connected and has blown. It is a great way to use the multimeter's ohmmeter setting to check the fuse's resistance. Before taking this measurement, remember to remove the fuse from the fuse box or housing. Place the probes on both ends of the fuse once more. A low reading, close to zero, usually indicates that the circuit is open and the fuse is working properly. A high reading and resistance value, on the other hand, indicates that there is a problem and the fuse has blown.   Figure5：multimeter's ohmmeter     7.1 How to tell if a Car Fuse is blown? There are a few quick ways to check if a car fuse is blown. To begin, locate the fuse that controls whatever device isn't working. You can find a diagram inside the fuse box lid, in the owner's manual, or online. Then, using fuse pullers, remove the fuse - make sure your car is completely turned off before you do this! Next, look for visible signs of discoloration or broken filaments on the fuse. After that, you can replace the car fuse. Figure6：check if a car fuse is blown   Ⅷ How to Replace a Car Fuse? 8.1 Locate Your Car Fuse The location of the fuse box is very different as different models and types of your vehicles have different locations. There may be multiple Fuse Boxes. Most cars have two fuse boxes, one under the hood and the other beneath the dashboard beneath the steering wheel. Your owner's manual will help you locate your fuse box. If you don't have one for your car, a free copy can usually be found by conducting a Google search. Figure7：Fuse Box Locations 8.2  Remove a Car Fuse Fuse can be small and delicate depending on the type, making it difficult to remove them without causing breakage or damage to neighboring fuses. Many cars include a fuse puller, which is a handy device designed to make removing automotive fuses much easier. Before attempting to remove a fuse, locate the fuse puller – if the vehicle has one – as this will assist you in quickly and cleanly removing the affected fuse. If your vehicle lacks a fuse puller, you can purchase one to complete the task effectively. Figure8：cutter Ⅸ How to Change a Car Fuse Step by Step? In Summery, use the steps below to learn how to easily change an automotive fuse: Locate the fuse panel in your vehicle. You may need to consult the owner's manual, which is usually located under the steering wheel.Remove the cover from the fuse panel. Inside, you'll see a variety of colors and numbers denoting different amperages, as well as a diagram (usually on the reverse of the cover) indicating what each fuse powers in your vehicle.Find the blown fuse. The interior is usually black, and the metal filament may be broken. If it's dark, you might want to use a flashlight to speed up the process.Take out the blown fuse. To extract the blown fuse, you can use a variety of tools (or simply your hands); the important thing is to use caution. Fuses can easily break, and a broken fuse is much more difficult to remove than a fully intact one.Insert a replacement fuse of the appropriate amperage—remember to take note of the fuse panel and your owner's manual on this one. Using the wrong amperage fuse can lead to serious electrical problems.In your glove box, keep a few extra fuses of various amperages.Start the engine to see if your hard work has paid off. Tips: If the same fuse blows soon after you replace it, or if it doesn't work at all, it's time to call a mechanic.   Ⅹ FAQ 1. How does a rectifier diode work? A rectifier is a device that converts an Alternating Current (AC) into a Direct Current (DC) by using one or more contact diodes. ... In simple words, a diode allows current in just one direction. This unique property of the diode allows it to act sort of a rectifier by converting an alternating current to a DC source. 2. What is a rectifier used for? Essentially, a rectifier is an electrical device used to convert alternating current (AC) into direct current (DC) by allowing a current to flow through the device in one direction only. Diodes work like one-way valves within the rectifier to maintain this flow of current. 3. Why diode can be used as a rectifier? An ideal p-n junction diode has zero resistance in forward direction and infinite resistance in reverse bias. This can be used to eliminate the negative cycles in an AC voltage waveform and allow only the positive cycles. This process is called rectification and is useful in many applications like AC to DC conversion. 4. What is rectifier and its types? Rectifiers are used in a variety of devices and can be applied to modify network systems. ... On the whole, rectifiers can be classified into two types – single phase and three phase. Drilling down another level, they can then be separated into half wave, full wave and bridge rectifiers. 5. What is the most widely used rectifier? A widely used rectifier is the three phase, 6 pulse, diode bridge rectifier. It's main use is low voltage motor drive front end. The single phase uncontrolled full wave bridge rectifier circuit configuration (four diodes arranged in a bridge circuit) is the most widely used rectifier configuration today. 6. What are the three types of rectifier? The Different Types of Rectifiers Single Phase & Three Phase Rectifiers. Half Wave & Full Wave Rectifiers. Bridge Rectifiers. Uncontrolled & Controlled Rectifiers.  

2026 Executive SummaryA Rectifier Diode is a critical semiconductor component that acts as a one-way valve for electricity, converting Alternating Current (AC) into Direct Current (DC). In 2026, while silicon-based diodes remain standard for low-voltage electronics, the industry is rapidly shifting toward Silicon Carbide (SiC) and Gallium Nitride (GaN) diodes for high-efficiency power supplies, EV charging, and renewable energy systems due to their superior thermal performance and speed.Ⅰ Introduction: The Role of Rectifier Diodes in 2026Diodes are fundamental semiconductor devices essential for modern electronics. A rectifier diode is a specialized two-lead semiconductor that allows current to flow in only one direction, effectively blocking reverse current. Mechanically, the P-N junction diode is created by fusing n-type and p-type semiconductor materials. The anode represents the positive (P-type) side, while the cathode represents the negative (n-type) side. While generic diodes serve many purposes, rectifier diodes are specifically engineered for power conversion—transforming AC voltage into stable DC voltage for power supplies, battery chargers, and automotive systems. Zener diodes differ as they are primarily used to regulate voltage and prevent unwanted variations in DC supplies within a circuit.Ⅱ What is a Rectifier and How Does It Function?A rectifier is an electrical circuit or device that converts alternating current (AC), which reverses direction periodically, into direct current (DC), which flows in a single direction. The inverter performs the reverse operation (DC to AC).Rectifiers are universally applied to convert household AC mains power into usable DC for electronic devices. As of 2026, classification has evolved beyond simple topologies. The bridge rectifier remains the industry standard for most applications. Contrary to older definitions, a rectifier does not "generate" electricity; it converts voltage types with varying degrees of efficiency. Modern rectifiers are categorized as follows:Primary Rectifier Classifications:Single-phase rectifiers: Common in domestic electronics.Three-phase rectifiers: Used in industrial motors and EV charging stations.Half-wave rectifiers: Low efficiency, used in simple signal applications.Full-wave rectifiers: High efficiency, utilizes the full AC cycle.Controlled rectifiers: Uses SCRs/Thyristors to control voltage output.Active Rectifiers (Synchronous): Uses MOSFETs instead of diodes for >99% efficiency (Standard in 2026 high-end tech).  Ⅲ Rectifier Diode Tutorial: Visual GuideWhat is a Rectifier? (AC to DC): Electronics Basics 7  Rectifier Diode Video Description : This video explains the fundamental physics of the Rectifier Diode and demonstrates basic rectification circuits used in power supply units (PSUs). Ⅳ What Defines a Rectifier Diode in Modern Electronics?A rectifier diode is a high-current semiconductor device specifically optimized to handle the stress of converting AC to DC in bridge configurations. In 2026 digital electronics, Schottky barrier diodes are highly valued for their low forward voltage drop (approx. 0.15V–0.45V) and fast switching speeds. Modern rectifier diodes control currents ranging from milliamperes (mA) to several kilo-Amperes (kA) and block reverse voltages from a few volts up to 10kV in specialized grid applications.While traditional rectifier diodes are designed using Silicon (Si), high-performance sectors now utilize Wide Bandgap (WBG) materials. Germanium (Ge) diodes are largely obsolete in power applications due to heat sensitivity, though they persist in niche RF detection. The modern comparison lies between Silicon and Silicon Carbide (SiC). SiC diodes offer superior thermal conductivity and higher breakdown voltages compared to legacy Silicon diodes.There are two critical technical parameters in a rectifier diode: Absolute Maximum Ratings (permissible limits) and Electrical Characteristics (operational performance). A rectifier diode symbol is shown below, with the arrowhead pointing in the direction of conventional current flow (Anode to Cathode).  Figure 1: Standard Rectifier Diode Symbol  Ⅴ Diode vs. Rectifier: Key Differences ExplainedA rectifier is a circuit application designed to convert AC to DC, whereas a diode is the specific semiconductor component used within that circuit. Think of the diode as the "valve" and the rectifier as the "plumbing system." The diode acts as a switch, allowing current to pass when forward-biased and blocking it when reverse-biased. Ⅵ Technical Parameters (2026 Standards)Silicon remains the most common material for general-purpose rectifier diodes due to cost-effectiveness. However, distinguishing between legacy and modern materials is vital:Silicon (Si): Junction Temperature (Tj) up to 150°C. Forward Voltage Drop ($V_F$) ~0.7V - 1.1V.Germanium (Ge): Rarely used. Low $V_F$ (0.3V) but very low thermal ceiling (Tj = 75°C).Silicon Carbide (SiC): The 2026 standard for EVs and Servers. High Tj (>175°C), high breakdown voltage, and near-zero reverse recovery time. We divide the rectifier diode's technical parameters into two primary groups relevant to engineering data sheets: Ⅶ Rectifier Diode – Current-Voltage (I-V) CharacteristicsThe I-V characteristic curve illustrates how a diode behaves under forward and reverse bias. The "knee voltage" or cut-in voltage is the point where current begins to flow rapidly.Figure 2: Current-Voltage characteristics of the Rectifier Diode   Ⅷ Common Applications in 2026Rectifier diodes are ubiquitous in modern electronics. Their applications have expanded with the rise of renewable energy and electric vehicles:Power Rectification: Converting grid AC (110V/220V) to DC for appliance power supplies.Freewheeling Diodes: Protecting circuits from voltage spikes in inductive loads (motors, relays).Demodulation: Signal isolation in radio receivers (AM radio).Voltage Multipliers: Changing signal amplitude in high-voltage generators.Solar Inverters: Preventing reverse current flow from batteries back to solar panels at night.EV Charging: On-board chargers (OBC) utilizing SiC diodes for rapid battery charging. Ⅸ How a Rectifier Diode Circuit Works (Physics)The functionality of a diode relies on the P-N junction, formed by chemically combining n-type (electron-rich) and p-type (hole-rich) semiconductor materials. The two terminals are the Anode (P) and Cathode (N). "Biasing" refers to applying external voltage to these terminals to control operation.1. Unbiased Rectifier Diode (Equilibrium)When no voltage is applied, the diode is Unbiased. Electrons from the N-side diffuse into the P-side, while holes from the P-side diffuse into the N-side. This recombination creates immobile ions near the junction interface, forming a Depletion Region. A built-in electric field (Barrier Potential) is created, preventing further current flow (approx. 0.7V for Silicon). 2. Forward Biased (Conducting State)When the positive terminal of a source is connected to the Anode and negative to the Cathode, the external voltage overcomes the barrier potential. The depletion region collapses, and current flows freely.3. Reverse Biased (Blocking State)When the positive terminal is connected to the Cathode, the depletion region widens. Ideally, no current flows. However, if the reverse voltage exceeds the diode's Breakdown Voltage, the depletion layer is destroyed (Avalanche Breakdown), allowing massive current flow that typically damages standard rectifier diodes. Figure 4: Circuit configuration for Biasing   Ⅹ Step-by-Step Guide: How to Test a Rectifier DiodeTo determine if a rectifier diode is functional or "blown," you can use a standard digital multimeter. There are two primary methods for testing polarity (Anode vs. Cathode) and health. Method 1: Using Diode Test Mode (Recommended) This is the most accurate method. The function of a diode check injects a small current to measure the forward voltage drop.  Forward-bias Test: Connect the Red probe to Anode and Black to Cathode. A healthy Silicon diode will read between 0.5V and 0.8V.  Reverse-bias Test: Swap the probes. The meter should read "OL" (Over Limit) or "1," indicating infinite resistance. If it reads 0 or emits a continuous beep, the diode is shorted (broken).  Method 2: Using Resistance (Ohmmeter) Mode If your meter lacks a diode mode, use the 2kΩ resistance setting.  Forward-bias: You should see a low resistance reading (typically under 1kΩ, though not strictly 0.7V).  Reverse-bias: The multimeter should show very high resistance or "OL". Note: In practical circuit repair, you must desolder at least one leg of the diode from the PCB to get an accurate reading, otherwise other components will interfere with the measurement. Ⅺ Frequently Asked Questions (FAQ)1. How does a rectifier diode work in simple terms?A rectifier diode acts like a one-way street for electricity. It allows current to flow forward easily (Forward Bias) but blocks it from flowing backward (Reverse Bias). This unique property allows it to "rectify" AC power (which moves back and forth) into DC power (which moves one way).2. What is the primary use of a rectifier in 2026?The primary use remains converting Alternating Current (AC) from the wall outlet into Direct Current (DC) required by virtually all electronic devices, from smartphones to Electric Vehicles.3. Why can a diode be used as a rectifier?An ideal p-n junction diode has zero resistance in the forward direction and infinite resistance in reverse bias. By eliminating the negative half-cycles of an AC waveform, it produces a pulsating DC output.4. What are the main types of rectifiers?Rectifiers are classified by phases (Single-phase vs. Three-phase) and control (Uncontrolled Diodes vs. Controlled Thyristors). In terms of topology, they are separated into half-wave, full-wave center-tapped, and bridge rectifiers.5. What is the most widely used rectifier configuration?The Full-Wave Bridge Rectifier (using four diodes) is the most efficient and widely used configuration for standard power supplies. In high-efficiency modern applications (like server PSUs), "Synchronous Rectifiers" using transistors are becoming dominant.6. How do I know if my rectifier diode is bad?If a multimeter test reads "0" (short circuit) in both directions, or "OL" (open circuit) in both directions, the diode is defective and must be replaced.{ "@context": "https://schema.org", "@type": "Article", "headline": "Rectifier Diodes: The 2026 Guide to Function, Types, and Testing", "datePublished": "2021-11-16", "dateModified": "2026-01-09", "description": "A comprehensive guide to rectifier diodes, covering operation principles, AC to DC conversion, SiC vs Silicon types, and step-by-step testing instructions.", "articleBody": "Diodes are common semiconductor devices. A rectifier diode, a two-lead semiconductor provides only one direction of current to flow...", "mainEntity": [ { "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How does a rectifier diode work?", "acceptedAnswer": { "@type": "Answer", "text": "A rectifier diode works by allowing current to flow in only one direction (forward bias) while blocking it in the opposite direction (reverse bias), effectively converting AC to DC." } }, { "@type": "Question", "name": "What is a rectifier used for?", "acceptedAnswer": { "@type": "Answer", "text": "Rectifiers are used to convert Alternating Current (AC) mains power into Direct Current (DC) for electronic devices, batteries, and motors." } }, { "@type": "Question", "name": "How do you test a rectifier diode?", "acceptedAnswer": { "@type": "Answer", "text": "You can test a diode using a multimeter in 'Diode Mode'. It should show a voltage drop (approx 0.7V for Silicon) in one direction and 'OL' (Over Limit) in the other." } } ] }, { "@type": "HowTo", "name": "How to Test a Rectifier Diode with a Multimeter", "step": [ { "@type": "HowToStep", "name": "Set Multimeter to Diode Mode", "text": "Turn the dial of your digital multimeter to the Diode Check symbol (usually looks like an arrow with a line)." }, { "@type": "HowToStep", "name": "Test Forward Bias", "text": "Connect the red probe to the anode (unmarked end) and the black probe to the cathode (marked with a stripe). A good diode displays between 0.5V and 0.8V." }, { "@type": "HowToStep", "name": "Test Reverse Bias", "text": "Reverse the probes (Red to Cathode, Black to Anode). The meter should display 'OL' or '1', indicating no current flow." } ] } ]}

ⅠIntroduction Motor capacitors temporarily store an electrical charge to provide additional torque and improve the performance and efficiency of a motor. Start capacitors provide added torque during motor startup and then exit the circuit when the motor reaches operating speed. Run capacitors assist the motor in maintaining a consistent charge while it is running. By balancing working power and supplied power, power factor correction capacitors reduce motor power consumption caused by heavy inductive loads. Motor capacitors are most frequently used to power motors in HVAC applications such as fans, blowers, and compressors, but they are also found in pumps, conveyors, and machine tools. What does a run capacitor look like? Catalog ⅠIntroduction Ⅱ Two Types of Motor Capacitor 2.1 What is the run capacitor？ 2.2 What is the starter capacitor? Ⅲ Run Capacitor Related Video Ⅳ Specifications of Run Capacitor Ⅴ Faulty Run Capacitor 5.1 When Is It Time to Replace a Run Capacitor? 5.2 Causes of Failure Ⅵ How To Replace a Start Run Capacitor? Ⅶ How Do They Work In an HVAC System? Ⅷ Dual Capacitors vs. Run Capacitors vs. Run Capacitors   Ⅱ Two Types of Motor Capacitor Motor capacitor include two types: run capacitor and starter capacitor. Let us have a look at the two capacitors.   2.1 What is the run capacitor？ Run capacitors are rated in the 3–70 microfarad range (uF). Voltage classification is also applied to rate run capacitors. The voltage levels are 370V and 440V. Starting capacitors have ratings greater than 70 microfarads (uF). Run capacitors are designed for continuous duty and remain energized throughout the lasting of the motor's operation. A capacitor is required to power a second phase winding in a single-phase electric motor. This is why the sizing is so crucial. The motor will not have an even magnetic field if the incorrect run capacitor is installed.This case will lead to the rotor hesitating at uneven spots. This pause causes the motor to become noisy, increases energy consumption, reduces performance, and causes the motor to overheat.   2.2 What is the starter capacitor? In contrast to run capacitors, which have a specific uF rating, starting capacitors are housed in a black plastic case and have an uF range. Start capacitors (with ratings of 70 microfarads or higher) are classified into three voltage classes: 125V, 250V, and 330V. A 35 uF at 370V run capacitor and an 88–108 uF at 250V start capacitor are two examples. Start capacitors increase motor starting torque and allow a motor to be rapidly cycled on and off. Start capacitors are designed for one-time use only. Start capacitors are energized for a short time, allowing the motor to reach 3/4 of its full speed before being disconnected from the circuit.   Ⅲ Run Capacitor Related Video   Start Capacitors & Run Capacitors for Electric Motors - Differences Explained by TEMCo run capacitor video descriped:  What's the difference between a start capacitor and a run capacitor? Can you use them interchangeably? See why these two types of capacitors cannot always be substituted for one another.   Ⅳ Specifications of Run Capacitor Most run capacitor applications employ capacitance ratings of 2.5-100 uf (microfarads) and voltages of 370 or 440 VAC. They are also usually rated at 50 and 60 Hz. Cases are typically round or oval in shape, with a steel or aluminum shell and cap. Terminals are typically 14" push-on terminals with 2-4 terminals per connection post.   Specifications of Run Capacitor   Ⅴ Faulty Run Capacitor 5.1 When Is It Time to Replace a Run Capacitor? As a general rule, a run capacitor will greatly exceed the start capacitor of the same motor. A run motor capacitor will wear down at different levels, making it more complicated to determine if it needs to be replaced. When a run capacitor begins to perform outside of its allowable range, the rated capacitance value usually drops. A "tolerance" will be specified for most standard motor run capacitors, describing how close the actual value may be to the rated capacitance value. It is usually within +/- 5% to 10%. For most motors, as long as the actual value is within 10% of the rated value, you're good to go. A run capacitor will occasionally bulge from internal pressure due to a flaw in the capacitor's construction or a non-capacitor-related motor issue. Most modern run capacitor designs will open the circuit, disconnecting the internal spiral membrane as a precautionary measure to keep the capacitor from popping. The test is simple: it is time to replace in both cases that it is  bulging and there is  no continuity between the terminals, Run Capacitor   5.2 Causes of Failure Depending on how close the run capacitor is to its design life, there could be several reasons why it failed.   Diagnosing and Replacing a Run Capacitor   Ⅵ How To Replace a Start Run Capacitor? When a new motor is installed, a new fan capacitor should always be installed. It is always a good idea to photograph or write down the wire coloring and connections. Turn off the power to the HVAC unit and use a meter to ensure it is completely off.Locate and remove the side panel where the electricity is fed into the unit.Locate the Stat Run Capacitor;  there will only be one in a Dual Run capacitor. If there are two, only the fan motor capacitor has to be replaced.Check the MFD and voltages, then connect the new connections from the old capacitor to the new capacitor one leg at a time to ensure they are correct. (For example, if you have two capacitors, one is for the compressor and the other is for the fan motor.)   Ⅶ How Do They Work In an HVAC System? A Start or Run Capacitor can be combined into a single capacitor with three leads known as a Dual Capacitor, or it can be split between two separate capacitors. The Start Capacitor gives a fan motor the torque it needs to start spinning and then turns off, whereas the Run Capacitor stays on and provides extra torque to the motor when needed. The motor will most likely not start if the Start Capacitor fails. If a Run capacitor fails, the motor will start, but the running amperage will be higher than usual, causing the motor to run hot and have a short life expectancy. There are three connections on a Dual Capacitor: HERM, FAN, and COM. HERM is for the Hermetically Sealed Compressor, FAN is for the Condenser Fan Motor, and COM is for the Contactor, which powers the Capacitor. If the unit has two capacitors, the larger of the two is the Run Capacitor. Keep in mind that the compressor frequently necessitates the use of a HERM capacitor (compressor). Run Capacitor circuit   Ⅷ Dual Capacitors vs. Run Capacitors vs. Run Capacitors The only benefit we can get from the dual-run capacitor design is that it comes in a small package with only three connections. Aside from that, there is no distinction between run and dual run capacitors. If there is enough space for mounting, it is acceptable to replace your original dual-run capacitor with two separate run capacitors. They typically have "C" connections for "common," "H" or "Herm" connections for "Hermetic Compressor," and "F" connections for "Fan." They'll also have two different capacitor ratings for the two parts. Start capacitors provide a high capacitance value required for motor starting in a very short (seconds) time. They are only designed for intermittent duty and will fail catastrophically if left on for an extended time. Run capacitors are continuous duty because they provide continuous voltage and current control to a motor's windings. They typically have a much lower capacitance value.   Ⅸ FAQ 1. What happens when a run capacitor goes bad? A bad motor capacitor may cause starting problems or could shut off the motor while running. Same principle on the dirty coil. ... If a Run capacitor goes bad then a motor can turn on but the running amperage will be higher than normal causing the motor to run hot and have a short life expectancy. 2. What is the difference between a capacitor and a run capacitor? The start capacitor creates a current to voltage lag in the separate start windings of the motor. The current builds up slowly, and the armature has an opportunity to begin rotating with the field of current. A run capacitor uses the charge in the dielectric to boost the current which provides power to the motor. 3. Can I run my AC without a capacitor? Most of the motors in your air conditioner can't run without a good capacitor. Like I said, they support these motors. They help the motor start and run efficiently. Some people have gone out to their air conditioner and noticed the fan wasn't spinning on their AC as it should be. 4. Can I use a run capacitor in place of a start capacitor? The capacitance and voltage ratings would have to match the original start capacitor specification. A start capacitor can never be used as a run capacitor, because it cannot not handle current continuously. 5. Do I need a start or run capacitor? Run capacitors are designed for continuous duty, and are energized the entire time the motor is running. Single phase electric motors need a capacitor to energize a second phase winding. ... Start capacitors increase motor starting torque and allow a motor to be cycled on and off rapidly. 6. What size run capacitor do I need? The run capacitor should have the exact microfarad (uf) that the motor is rated for. Capacitors rated above 70uf are considered Start Capacitors and are generally removed from the circuit electrically during operation. This is where the rule of +/- 10% of the rating came from, for Start Capacitors ONLY!