The Kynix Blog

  With the evolving times and fast-advancing technologies, smart devices, computerized systems and other industrial applications are heavily relying on miniature computing.  In today’s world, embedded systems are a critical part of the daily average person ranging from their application in homes, offices, industries and even personal gadgets.   These embedded systems have become a crucial part of real life partly due to their ease of use, minimal intervention and availability. The engineering behind these systems is to meet the requirements while being efficient, low powered and meeting essential demands. Some of the devices that we used daily with smart devices include microwaves, smart ovens, refrigerators, washing machines, and smart lighting, to mention but a few.   Artificial intelligence and machine learning in recent days have been in the limelight with many investors and a major key player in the world of technology contributing to its growth. The application of machine learning and artificial intelligence is virtually limitless. The heart of most devices using this technology are embedded systems. As the use of embedded systems continues to grow within every industry and sector, so does technology.   Embedded systems and embedded controllers are often used interchangeably and for the most part, can pass for each other. However, there is a slight difference in meaning. Embedded Systems vs Embedded Controllers An embedded system is a combination of hardware and software designed for a specific purpose, often with real-time constraints. It typically consists of a microcontroller, memory, input/output peripherals, and sometimes additional hardware such as sensors or actuators. Embedded systems are used in a wide range of applications, including consumer electronics, automotive, aerospace, and industrial automation.   An embedded controller is a type of microcontroller, often just referred to as a microcontroller, that is specifically designed for controlling a specific device or system. It is typically used in embedded systems that require precise control over the operation of mechanical or electrical components. Embedded controllers often have specialized features such as analogue-to-digital converters, timers, and communication interfaces that make them well-suited for controlling a specific system.   In general, an embedded controller is a specific type of microcontroller that is designed to perform a specific function within an embedded system. Meanwhile, an embedded system can consist of various components, including microcontrollers, and is designed to perform a specific task or set of tasks. Thus, an embedded system is the device and interface that we interact with daily while the microcontroller is the control unit that gives life to the technology.   Over the years, embedded controllers have evolved significantly with major improvements and advancements from the earliest microprocessors and iterations of a microcontroller to the advanced microcontrollers we use today. Why embedded controllers Embedded controllers are found in a wide variety of devices, products and systems from household appliances and medical devices to industrial machinery and automotive systems. Their application also can be vastly diverse from simple automation applications such as light control to entire industrial automation setups. With the rise of IoT and industrial application of IoT (IIoT), applications in the industrial sector have rapidly expanded.   Aside from their simplicity, inexpensiveness and a vast array of applications, embedded systems are chosen for their other advantages. Compared to traditional computers and microprocessors, embedded controllers are the key enablers of modern automation.   Here are a few key indicators of how embedded systems have evolved and changed the world of automation and modern miniaturized computing: Improved efficiency  Embedded controllers are helping to improve efficiency in a variety of applications, from smart homes to industrial automation. By automating routine tasks and optimizing processes, these controllers can help reduce waste, save energy, and streamline operations.   Enhanced functionality  Embedded controllers are enabling new and innovative features in a wide range of products, from cars and smartphones to medical devices and appliances. These controllers are making it possible to deliver new levels of performance, functionality, and convenience to consumers and businesses.   Increased automation Embedded controllers are helping to drive the automation of many industries, from manufacturing and logistics to agriculture and healthcare. By automating routine tasks, these controllers can help increase productivity, reduce costs, and improve quality control.   Greater precision and accuracy Embedded controllers are enabling greater precision and accuracy in many applications, from medical devices and scientific instruments to automotive systems and consumer electronics. By controlling and monitoring specific functions, these controllers can help ensure that products and systems operate reliably and accurately.   Advancements in technology Embedded controllers are driving advancements in technology, from the Internet of Things (IoT) to autonomous vehicles and smart cities. These controllers are enabling the development of new technologies and systems that are transforming the way we live, work, and interact with the world around us.   Integration of communication interfaces In the mid-2000s, microcontrollers began to integrate communication interfaces, such as Ethernet, Wi-Fi, and Bluetooth, which made it possible to connect devices to the internet and other devices. This paved the way for the development of the Internet of Things (IoT).   Advancements in power efficiency In recent years, microcontrollers have become more power-efficient, with the development of low-power processors, sleep modes, and power management systems. This has enabled the development of battery-powered devices that can operate for extended periods.   Advanced functionality and security Today's microcontrollers offer advanced functionality, such as real-time operating systems, graphics processing, and machine learning capabilities. They also incorporate advanced security features to protect against cyber threats.   Embedded controllers are shaping the world we live in, enabling new levels of efficiency, functionality, and automation across a wide range of industries and applications. As technology continues to advance, microcontrollers are likely to continue to evolve and play an increasingly important role in our lives.   Exploring Embedded Controllers in Real Life As earlier said, the application of embedded controllers has become immense and the potential of further exploration is still underway. With these advancements and vast applications, the impact of this technology is revolutionary and is shaping the future.   Embedded controllers are changing the world in several ways, thanks to their ability to improve efficiency, increase productivity, and enhance functionality in a wide range of applications. Here are a few examples:   Smart Home Automation and Home Appliances In terms of vast applications and the most widely explore uses of embedded controllers, home automation carries the day. This is perhaps due to the simplicity of using embedded controllers and embedded systems, enabling small applications, simple smart devices, DIY projects of automation and other reliable solutions to smart monitoring and even security systems. Embedded controllers are a key component of the smart home revolution, enabling homeowners to remotely monitor and control their appliances, heating and cooling systems, security systems, and more. This allows for greater energy efficiency, convenience, and comfort.   Health Management Systems Embedded controllers are playing an important role in healthcare, enabling the development of advanced medical devices that can monitor and administer medication with greater accuracy and precision. This improves patient outcomes and reduces the risk of errors.   Medical Devices Over the longest time, medical devices and other healthcare-related systems have tried to incorporate embedded systems. This allows for easier monitoring, management and even automation of simple processes. The systems can gather and collect data on a patient’s condition and monitor progress in treatment by monitoring heart rate, pulse rate and other vitals. The information can be relayed to caregivers or doctors via the cloud.   Medical devices, such as pacemakers and insulin pumps, rely on embedded controllers to monitor vital signs and even administer medication. These controllers are designed to operate reliably and accurately in a wide range of conditions Automobiles and Autonomous Vehicles With the advent of the booming exploration in autonomous and self-driving vehicles, such as self-driving cars, autonomous submarines and unmanned drones, the use of embedded controllers has played a key role. Providing navigation systems, IoT modules, battery management systems and other subsystems that relay all the needed data to the users. Embedded controllers are a critical component of autonomous vehicles, enabling them to monitor their surroundings, make decisions, and take action without human intervention. This has the potential to revolutionize transportation and make it safer and more efficient.   In modern automobiles, embedded systems are designed and fitted to provide a better customer experience whilst also providing enhanced safety on the road. The result of this has been realized with lower traffic fatalities over the years.Adaptive speed control, automobile breakdown warning, pedestrian detection, merging assistance, airbags, and other active safety systems are some prominent examples. These are a few of the characteristics that are expected to reduce the risk of accidents and increase demand for embedded systems throughout the world.   Industrial automation With Industry 4.0 on the cusp of fruition, embedded controllers are playing a vital role in its realization being the link between modern technology, IoT and industrial systems. Most industrial systems and setups are adopting machine learning and artificial intelligence to improve work efficiency, accuracy, repeatability, and safety and reduce the cost of labour. This is possible since machines using sophisticated algorithms can identify defects, reduce downtime and diagnose systems before failure.   Embedded controllers are used in industrial automation systems to control machinery and monitor production processes. These controllers can operate in harsh environments and are designed to withstand high temperatures, vibrations, and other stresses. In such applications robots are designed to perform tasks that are considered dangerous. Robots are equipped with embedded systems, employing the use of sensors actuators and feedback from other systems to perform the tasks safely.   Consumer electronics Devices like smartphones, tablets, and smart speakers use embedded controllers to manage their complex functions and interfaces. These controllers help to optimize battery life, reduce power consumption, and enhance user experiences.   Overall, the evolution of microcontrollers has enabled the development of a wide range of devices and systems, from simple household appliances to complex industrial machinery and the Internet of Things. As technology continues to advance, microcontrollers are likely to continue to evolve and play an increasingly important role in our lives.   FAQs What is an embedded controller? An embedded controller, also known as a microcontroller, is a small computer system that is designed to control and manage specific tasks within electronic devices.   Embedded controllers are changing the world in several ways, such as improving efficiency, enhancing functionality, increasing automation, and enabling new technologies and systems.   What are some examples of applications that use embedded controllers? Examples of applications that use embedded controllers include smart homes, medical devices, automotive systems, industrial automation, and the Internet of Things (IoT).   Embedded controllers are playing an important role in healthcare, enabling the development of advanced medical devices that can monitor and administer medication with greater accuracy and precision, leading to improved patient outcomes and reduced risk of errors.   Embedded controllers are a critical component of the IoT, enabling devices to communicate with each other and with the internet, and enabling the development of new technologies and systems that are transforming the way we live and work.   What are some future developments in embedded controllers? Future developments in embedded controllers are likely to include advancements in processing power and memory, integration of communication interfaces, improvements in power efficiency, and advanced functionality such as machine learning and artificial intelligence          

CatalogIntroductionComponents RequiredSoftware RequiredHardwareUltrasonic Sensor (HC-SR04)WorkingCOMPLETE HARDWARESoftwareConclusion Future Enhancement in the Project IntroductionThe aim of this undertaking is to educate ourselves on the creation of a Blind Walking Stick that utilizes an Arduino and an Ultrasonic Sensor HC-SR04. There are Billions of people who are blind in this world. These individuals require assistance from others to navigate and move around as they are unable to do so independently. To address this issue, we have developed a device called the Blind Walking Stick which enables visually impaired individuals to walk more easily without relying on others for assistance. To enhance the device's accuracy and efficiency, two or three Ultrasonic Sensors can be incorporated into the project.  Components Required: Arduino UNO BoardHC-SR04 Ultrasonic SensorBuzzer9 Volt BatterySwitch (Optional) Software Required:Arduino IDE  Hardware: Connection of Ultrasonic Sensor with Arduino.  Vcc pin of Ultrasonic Sensor  is connected to 5-volt pin of ArduinoTrigger pin of Sensor is connected to D9 pin of ArduinoEcho pin of Sensor is connected to the D10 pin of ArduinoThe ground of Sensor is connected to the GND pin of Arduino.The positive terminal of the 9-volt battery is connected to the Vin pin of Arduino and the negative terminal is connected to the GND pin of Arduino.A buzzer is connected between the D9 pin of Arduino and the GND pin Ultrasonic Sensor (HC-SR04)An electronic device known as an ultrasonic sensor is utilized to determine the distance of an object by emitting ultrasonic sound waves and then transforming the reflected sound into an electrical signal. These ultrasonic waves travel at a faster rate than audible sound, which cannot be perceived by humans. The ultrasonic sensor is comprised of two major components: the transmitter, which uses piezoelectric crystals to emit the sound, and the receiver, which detects the sound after it has traveled to and from the object. To compute the distance between the object and the sensor, the sensor calculates the time taken for the sound to travel from the transmitter to the receiver. This calculation is based on the formula D = ½ T x C, where D represents distance, T denotes time, and C is the speed of sound, roughly 343 meters/second. As an illustration, if an ultrasonic sensor is pointed at a box and it takes 0.025 seconds for the sound to return, then the distance between the sensor and the box can be calculated.D = 0.5 x 0.025 x 343  Ultrasonic sensors are used primarily as proximity sensors. They can be found in automobile self-parking technology and anti-collision safety systems. Ultrasonic sensors are also used in robotic obstacle detection systems, as well as manufacturing technology. In comparison to infrared (IR) sensors in proximity sensing applications, ultrasonic sensors are not as susceptible to interference of smoke, gas, and other airborne particles (though the physical components are still affected by variables such as heat).  Ultrasonic sensors are also used as level sensors to detect, monitor, and regulate liquid levels in closed containers (such as vats in chemical factories). Most notably, ultrasonic technology has enabled the medical industry to produce images of internal organs, identify tumors, and ensure the health of babies in the womb. WorkingThe primary aim of this project is to facilitate blind individuals in walking without difficulty and provide them with alerts whenever their path is obstructed by obstacles. The device utilizes a buzzer that emits a warning signal, the frequency of which changes based on the distance of the object. The buzzer will beep more frequently when the obstruction is closer. The core component used in the device is the Ultrasonic Sensor HC-SR04, which functions by transmitting a high-frequency sound pulse and then measuring the time taken to receive the sound echo reflection. The sensor is equipped with a transmitter and a receiver surface, with one transmitting ultrasonic waves and the other receiving the echoed sound signal. The sensor's calibration is based on the speed of sound in air, which is approximately 341 meters per second. After the distance measurement, Arduino makes a beep format using a buzzer also the led glow as well, The frequency of the beep is reduced when the distance is greater, and increased when the distance is shorter. COMPLETE HARDWARE  This is the Complete Hardware of our Project. Since this is a Prototype circuit so we used Selfie stick because it can extend and also We did not used 9V battery but instead we used 2 Lithium Ion cell and one rechargeable circuit to charge these cells, but for simple explanation of the project 9v battery can be used. We used On and Off simple switch to power On and Off the circuit and at the front of the stick we placed our Buzzer, Arduino and Ultrasonic Sensor. You can build the hardware the way you like but the circuit remains same.      Software // defines pins numbersconst int trigPin = 9;const int echoPin = 10;const int buzzer = 11;const int ledPin = 13; // defines variableslong duration;int distance;int safetyDistance;  void setup() {pinMode(trigPin, OUTPUT); // Sets the trigPin as an OutputpinMode(echoPin, INPUT); // Sets the echoPin as an InputpinMode(buzzer, OUTPUT);pinMode(ledPin, OUTPUT);Serial.begin(9600); // Starts the serial communication}  void loop() {// Clears the trigPindigitalWrite(trigPin, LOW);delayMicroseconds(2); // Sets the trigPin on HIGH state for 10 micro secondsdigitalWrite(trigPin, HIGH);delayMicroseconds(10);digitalWrite(trigPin, LOW); // Reads the echoPin, returns the sound wave travel time in microsecondsduration = pulseIn(echoPin, HIGH); // Calculating the distancedistance= duration*0.034/2; safetyDistance = distance;if (safetyDistance <= 5){  digitalWrite(buzzer, HIGH);  digitalWrite(ledPin, HIGH);}else{  digitalWrite(buzzer, LOW);  digitalWrite(ledPin, LOW);} // Prints the distance on the Serial MonitorSerial.print("Distance: ");Serial.println(distance);}   Conclusion Smart Walking Stick is very useful especially for blind people who want to go out for a walk. It helps them to walk smoothly  Future Enhancement in the Project We can add GPS in order to pinpoint the exact location of the personAlso we can add Voice recognition system which can tell where we are going and if any obstacle comes in our way it will let us know

CatalogAC Charging1) 1ϕ On-Board Slow Charging2) 3ϕ On-Board Fast ChargingDC Charging1) Off-Board Fast Charging2) Off-Board Rapid ChargingSummarizing with Key Points Overview: The effectiveness and cost of battery electric vehicles are directly related to the batteries and charging technologies that are employed. Several categories of wired charging technologies for battery electric vehicles are discussed in depth in this article. Based on the input voltage type delivered to the battery electric vehicle (BEV) inlets, the wire-based technologies are divided into two categories: AC-charging technologies and DC-charging technologies. 1ϕ on board (OB) slow charging technology and 3ϕ OB fast charging technology make up the first set. The latter category is divided into two groups: off-board fast charging technologies and off-board rapid charging technologies, as indicated in Fig. 1.Fig. 1. Overall charging system for BEVs using wired/wireless. Source: IEEE Access AC ChargingAC charging indirectly charges the battery via the onboard charger (OBC), which can be classified into two groups: 1ϕ OB slow charging and 3ϕ OB fast charging. 1) 1ϕ On-Board Slow Charging1ϕ OB slow charging usually requires multiple conversions (AC-DC and DC-DC), which leads to low-voltage ripples and a relatively high power rating. So, it is often used as an OBC inside BEVs, such as for level 1 AC charging (input voltage: 1ϕ 120 or 220 V, charging power: below 2 kW, and battery voltage (VB): DC 240–325 V) in a number of BEV models on the market (e.g., Tesla Model 3, Toyota RAV4, etc.). Fig. 2 shows a two-stage 1ϕ OBC that is easy to understand for BEVs. The battery is charged in the following ways: First, the grid voltage is changed so that an AC/DC converter can feed the power factor correction (PFC) circuit. Then, the PFC circuit's output voltage is sent to the intermediate DC-link bus, which is then turned into a controlled DC output voltage by an isolated DC/DC converter (such as a full-bridge (FB), flyback, etc.). This is how safe and effective battery charging is achieved. Note that a galvanic transformer is used at the DC-DC stage to get the galvanic isolation. Fig. 2(a) and 2(b) show unidirectional and bidirectional chargers, which can be set up in two different ways based on how the power flows. The unidirectional charger makes it easier for a utility grid to send power to a heavy load, like multiple BEVs, at the same time. By controlling the phase angle of the supply current, a unidirectional active front-end rectifier can provide power without draining the battery. This is one of the main benefits of this type of rectifier. So, a unidirectional charger is a good way to get a lot of BEVs on the road and actively control the charging current. The bidirectional charger can be used in both grid-to-vehicle (G2V) and vehicle-to-grid (V2G) technologies, unlike the unidirectional charger. A few disadvantages are that the battery lasts less when it is charged and discharged often, and the cost of the charging system goes up. A lot of safety and anti-islanding measures are also built into this type of charging technology. Fig. 2 shows one of the most common ways to charge a 1ϕ OB slowly. This is level 1, which has a power output of about 2 kW and a charging time of 6 hours or more. Fig. 2. 1ϕ on-board slow charging topologies. (a) Unidirectional topology. (b) Bidirectional topology. Source: IEEE Access 2) 3ϕ On-Board Fast Charging The 3ϕ OB fast charging technologies can charge batteries faster than the 1ϕ OB slow charging technologies because they have a medium power rating (about 20 kW). This means that they can charge the battery up to 80% in between 2 - 3.5 hours. So, they can be used for an OBC in BEVs like level 3 (i.e., input voltage: 3ϕ 280–420 V, charging power: up to 50 kW, and battery voltage (VB): DC 320–400 V): (e.g., Smart FortWo ED, Tesla Model 3, Toyota RAV4, etc.). Most of these charging technologies use Dual-Active-Bridge (DAB) topologies. Fig. 3 shows how the current 3ϕ OB fast charging technologies work. Because it is easy to use, this method is better for almost all BEVs on the market.Fig. 3. 3ϕ On-Board Fast Charging. (a) Unidirectional topology. (b) Bidirectional topology. Source: IEEE Access DC ChargingDC charging technologies for BEVs can be put into two groups: off-board fast charging and off-board rapid charging. 1) Off-Board Fast ChargingThe rectifying unit at the charging station makes it possible for these technologies to directly charge the battery of a BEV. Because of this, they can make the driving system smaller and lighter as a whole. Most of the time, these charging technologies use DAB topologies. These kinds of charging technologies are known for how quickly they charge (specifically, for their charging times below one hour). Companies with good reputations, like Tesla, BMW, Nissan, and Hyundai, have recently started to offer fast DC charging stations that can charge batteries in an hour. Fig. 4 shows the off-board fast charging technologies, which mostly use a 3ϕ power source with a power level between 20 - 120 kW, a charging time of less than one hour, and a battery voltage between DC 320 - 450 V. Fig. 4. 3ϕ off-board fast charging topologies. (a) Unidirectional topology (b) Bidirectional topology. Source: IEEE Access 2) Off-Board Rapid ChargingRapid charging technologies, which use more power and charging current, are an extension of fast charging technologies. In these ways of charging, the time it takes to charge is shorter, and a battery of a BEV with a DC 320–500 V can be charged up to 80% in 15 minutes. One of the best-known fast chargers, made by Tesla, is powered by DC 480 V and 250 kW. As of March 2020, Tesla had successfully run 16,013 superchargers at 1,826 charging stations around the world for its Model S, Model 3, Model X, and Model Y BEVs. For example, the Model S has a charging current of 80 A. For 85 kWh, it takes about 20, 40, and 75 minutes to charge the battery to 50%, 80%, and 100%, respectively. Fig. 5 shows the rapid charging topology, in which a high-power DC current that can reach 400 A charges the battery. The figure shows a 3ϕ unidirectional topology and a 3ϕ bidirectional topology, both of which are off-board configurations. Fig. 5. 3ϕ off-board rapid charging topologies. (a) Unidirectional topology. (b) Bidirectional topology. Source: IEEE Access Summarizing with Key Points:Some of the takeaways from the article are as follows:Based on how input voltage is given to the battery vehicle, battery electric vehicles are categorized into two categories: AC-charging technologies and DC-charging technologies.During AC charging, the onboard charger, which can be divided into two groups: 1ϕ OB slow charging and 3ϕ OB fast charging, indirectly charges the battery. And DC charging is divided into two categories: 3ϕ OB fast charging and 3ϕ OB rapid charging.Depending on how the power flows, 1ϕ on-board unidirectional and bidirectional chargers for slow charging can be set up in one of two ways. Level 1 charging, which takes 6 hours or longer to complete and has a power output of around 2 kW, is the most popular method. 3ϕ OB fast charging techniques can charge batteries by up to 80% in just 2 to 3.5 hours. These technologies are superior for practically all available electric since they use dual active bridge topologies and are simple to use.Fast DC charging stations that can charge batteries in an hour are now being offered by reputable firms. DAB topologies are notable for how quickly they charge batteries.Off-board fast charging methods employ a 3ϕ power source with a power output ranging from 20 to 120 kW, a charging time of under an hour, and a battery voltage range of DC 320 to 450 V.Off-board quick charging methods employ greater power and charging current while also speeding up the charging process. 16,013 superchargers at 1,826 charging stations around the world have been successfully used by Tesla. This blog post is part of a full research article from IEEE Access. The featured image is used courtesy of OPEN AI.

Introduction Digital instruments called phasor measurement units (PMUs) detect the magnitude and phase angle of alternating voltage and current on an AC power supply. PMU analyzes the variables using sample rates. It offers an in-system measurement of electrical quantities in real-time. The internet may be used to tag and share information about magnitude and phase angle, making it possible to study the dynamics of power systems over a wide area. One of the most crucial measuring tools for power systems of the future is thought to be the PMU. Algorithms are used in this project to review the PMU specifications. These algorithms aid in computing the sinusoidal signal's magnitude and phase angle.   Materials Required: Arduino UnoCurrent Sensor ACS712DC Regulated Power SupplyLCD DisplayRelay Driver CircuitAC Bulb  220 V 100WLM393 IC   Software Required: Arduino IDELABVIEW   LABVIEW   LabVIEW (Laboratory Virtual Instrument Engineering Workbench), created by National Instruments (www.ni.com)is a graphical programming language that uses icons instead of lines of text to create applications.LabVIEW programs/codes are called Virtual Instruments, or V is for short.LabVIEW is used for Data acquisition, signal Processing (Analysis), and hardware control–a typical instrument configuration based on LabVIEW   Schematic diagram of an instrument system based on LabVIEW   Hardware:   Schematic Diagram   Working   The Entire Project was developed on Arduino Mega 2560.Arduino Mega was used a Controller to perform all the complex calculations. The Results of Arduino was shown on Serial Monitor of Arduino .Then the coding of LabVIEW was done and the entire calculation was done on LabVIEW.   In the Electrical Schematic Diagram, The Input 220V is given to Voltage Transformer and to Current Sensor in Series with Load. The Load could be Inductive of Resistive. The Output of Transformer is given to Analog Pin to Arduino i.e. A0 and Output of Current Sensor is given to A1 pin of Arduino. The LM393 Comparator is being operated by Dual DC Power Supply -9V and +9V.The Output of Comparator is given to Digital Pin of Arduino i.e.8. The Relay is used to with Digital Pin of Arduino. There was some problem while using Relay so we are not showing the Pin no. with Relay but the procedure remains same. The Output of Relay is given to Load.The Output is shown on Computer Monitor Window i.e. Serial Monitor Window and LabVIEW.   Current Sensor (ACS712)   The Allergo ACS712 current sensor is based on the 1879 discovery of Dr. Edwin Hall's Hall-effect. This concept states that when a conductor carrying a current is put in a magnetic field, a voltage is produced across its edges that is perpendicular to both the direction of the current and the direction of the magnetic field. A magnetic field (B) perpendicular to the direction of current flow is applied to a thin strip of semiconductor material (referred to as a Hall element) while it is carrying a current (I). The Hall element's current distribution is no longer uniform due to the Lorentz force, and as a result, a potential difference is formed across its edges that is perpendicular to the directions of the current and the field. Its typical value is in the range of a few microvolts, and it is known as the Hall voltage. The magnitudes of I and B have a direct relationship to the Hall voltage. Hence, the observed Hall voltage can be used to estimate the other if one of them (I and B) is known.   ACS-712 current Sensor Module AC Current Measurement Using ACS712   Two directions of current are measured by the ACS712. Because the ACS712 has a 5 s output rise time in response to step input current, if we sample quickly and extensively enough, we will undoubtedly locate the peak in one direction and the peak in the opposite direction. We obtain about 4000 samples each cycle while monitoring AC current at 50 Hz, or 20 mSec every cycle.   To determine the current, all that is needed is knowledge of the waveform's shape given the location of both peaks. We are aware that the waveform for line or mains power is a SINE wave. Understanding it enables us to use a straightforward electronic formula to produce a respectable result.   RMS Current =  root(2) * Peek Current Circuit Connection for AC Current Measurement FREQUENCY   I used Voltage Comparator LM393N. The Inverting pin is Grounded and the signal is passed through a High Pass filter (removing DC component) and applied to the Non-inverting terminal. The comparator will act as a Zero Cross detector and when the amplitude is greater than 0, it will give a High output.  A zero-crossing detector can be used for the measurement of phase angle between two voltages Zero Crossing detector   PHASE   When capacitors or inductors are involved in AC circuit, the current and voltage do not peak at the same time. This leads to positive phase for inductive circuit since. When two signals differ in phase by -90 or +90 degrees, they are said to be in phase quadrature . When two waves differ in phase by 180 degrees (-180 is technically the same as +180), the waves are said to be in phase opposition . Illustration B shows two waves that are in phase quadrature. The wave depicted by the dashed line leads the wave represented by the solid line by 90 degrees. Phase Difference between Voltage and Current   Calculation Of Phase Angle   Phase is sometimes expressed in radians rather than in degrees. One radian of phase corresponds to approximately 57.3 degrees. Engineers and technicians generally use degrees; physicists more often use radians. The time interval for one degree of phase is inversely proportional to the frequency. If the frequency of a signal (in hertz ) is given by f , then the time t deg (in seconds) corresponding to one degree of phase is: t deg = 1 / (360 f ) The time t rad (in seconds) corresponding to one radian of phase is approximately: t rad = 1 / (6.28 f )   POWER FACTOR   Power factor is a crucial factor to take into account when designing an AC circuit because any power factor below one means that more current must flow through the wiring of the circuit than would be required if there was no reactance in the system in order to supply the same amount of (true) power to the resistive load. To counteract the impacts of the load's inductive reactance, a poor power factor can be ironically addressed by adding a second load to the circuit that draws an equal and opposite quantity of reactive power. The additional load in our example circuit must be a capacitor since inductive reactance can only be cancelled by capacitive reactance. The effect of these two opposing reactance in parallel is to bring the circuit’s total impedance equal to its total resistance (to make the impedance phase angle equal, or at least closer, to zero).   COMPLETE HARDWARE   This is the Complete Hardware of our Project. We used Voltage Transformer for DC Power supply circuit and another Voltage Transformer for making 5V circuit for measurement of AC Power supply in Arduino. Another Circuit for Frequency Measurement is used to measure Frequency of AC Supply. Circuit control is performed using an Arduino Mega. Here we have shown Resistive load for testing but practically we used Inductive load so that Phase can be actually be measured .Current Sensor is used for AC Current measurement.     Software   IDE (Integrated Development Environment)   The Java programming language is used to create the Arduino IDE (Integrated Development Environment). It is primarily utilized for Arduino programming. As the Arduino IDE is open-source software, no specific licensing is necessary. The software opening interface can be shown in figure 5.1 below. The executable code is transformed by the Arduino IDE using the AVR into a text file with hexadecimal encoding, which is then loaded into the Arduino board by a loader program in the firmware of the board. The capabilities supplied in this software are comprehensive and allow for an in-depth usage of this piece of hardware, and I have utilized it extensively in this project to program the Arduino. The Digital I/Os also allow for the reading of live status.   Coding /* Measuring AC Current Using ACS712 www.circuits4you.com */ const int sensorIn = A0; int mVperAmp = 66; // use 100 for 20A Module and 66 for 30A Module   double Voltage = 0; double VRMS = 0; double AmpsRMS = 0;   int mean_value = 0;    //////////////////////////////////////////////// void setup(){  Serial.begin(9600);      pinMode(8, INPUT);           pinMode(9, INPUT);   } long previous_time = 0;  long current_time = 0;  float Time=0; float frequency; float phase; float pf;   //coding for voltage measuring on A1 void loop() {   //measuring frequncy   while(digitalRead(8)==1); while(digitalRead(8)==0); previous_time = millis(); while(digitalRead(8)==1); while(digitalRead(8)==0); current_time = millis(); Time = (current_time) - (previous_time); //Serial.print(Time); //Serial.print("        "); Time=Time*0.001; frequency=1/Time;   //*2.52;/        // measuring voltage   int sensorValue = analogRead(A1);   // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 250V):   float voltage = sensorValue * (260.0 / 1024.0);   // measuring current    Voltage = getVPP();  VRMS = (Voltage/2.0) *0.707;  //root 2 is 0.707  AmpsRMS = (VRMS * 1000)/mVperAmp;   //display phase while(digitalRead(8)==1); while(digitalRead(8)==0); previous_time = micros(); //while(digitalRead(9)==0);  //????????????????????? current_time = micros();  //??????????????????? while(analogRead(sensorIn)<=mean_value);    //////////////////////// current_time = micros();      //////////////////////////////// Time = ((current_time) - (previous_time))/10; //Serial.print(Time); //Serial.print("Sec    "); phase = (360*frequency*Time)/100000;   pf=cos(3.142/3); Serial.print("AC Voltage: "); Serial.print(voltage); Serial.print(" Volts"); Serial.print(AmpsRMS); Serial.print("Amps RMS"); Serial.print(frequency); Serial.print("Hz      "); Serial.print(phase); Serial.print("degree   "); Serial.print("phase:"); Serial.println(pf);     delay(1000); }   float getVPP() {   float result;   int readValue;             //value read from the sensor   int maxValue = 0;          // store max value here   int minValue = 1024;          // store min value here      uint32_t start_time = millis();    while((millis()-start_time) < 1000) //sample for 1 Sec    {        readValue = analogRead(sensorIn);        // see if you have a new maxValue        if (readValue > maxValue)        {            /*record the maximum sensor value*/            maxValue = readValue;        }        if (readValue < minValue)        {            /*record the minimum sensor value*/            minValue = readValue;        }    }        // Subtract min from max    result = ((maxValue - minValue) * 5.0)/1024.0;    mean_value = (maxValue + minValue)/2;    //////////////////////    return result;  }     Conclusion   Phasor Measurement Unit is very applicable for Supply Corporation Companies. We have make it for local monitoring. By installing this system in Power System we can monitor our Phase remotely.

 Overview of flicker noiseFlicker noise in oscillatorsFlicker Noise in SemiconductorFlicker Noise in op AmpHow to eliminate the flicker noise in op AmpThe working mechanism of flicker noiseEquation of flicker noiseThermal Noise vs. Flicker NoisePros of the flicker noiseCons of flicker noiseApplications of flicker noiseFlicker Noise FAQ Overview of flicker noiseElectronic noise known as flicker noise or 1/f noise happens naturally in almost all electronic parts. It can also result from contaminants in conductive channels, creation and recombination noise inside transistors due to base current, and other factors. Pink noise or 1/f noise are common names for this noise. All electrical devices commonly experience this noise, which has a variety of origins but is typically correlated with direct current flow. It is important in a variety of electronic fields and is important for oscillators used as RF sources.Because the power spectral density of this noise increases with frequency, it is sometimes referred to as low-frequency noise. Below a few KHz, this noise is generally visible. The flicker noise bandwidth ranges from 10 MHz to 10 Hz.Figure 1: The relationship between noise voltage and frequency Flicker noise in oscillatorsFlicker noise is inversely proportional to frequency, or 1/f, and in many applications, such as RF oscillators, there are parts where flicker noise, or 1/f noise, dominates, and other regions where white noise from sources like shot noise and thermal noise, or both, dominate. Within the oscillator the flicker noise expresses itself as sidebands that are near to the carrier, the other kinds of noise stretching away from the carrier with a smoother spectrum, however fading the larger the offset from the carrier.As a result, there is a corner frequency, fc, between the regions where the various types of noise predominate. It is typically discovered that the noise outside of the region where flicker noise predominates is phase noise for a system like an oscillator. As the offset from the carrier increases, this decays until flat white noise takes over.MOSFETs have a greater fc (which can reach GHz levels) than JFETs or bipolar transistors, whose fc is typically below 2 kHz. When building RF oscillators, flicker noise, or 1/f noise, is a crucial type of noise. Although it is frequently disregarded, its influence can be reduced by selecting the right gadget.Figure 2: Flicker noise in ocillators Flicker Noise in SemiconductorThe nature of semiconductor noise and how it is specified in semiconductor devices are covered in the section that follows. Since the origin of each semiconductor noise source is a random process, the noise's instantaneous amplitude is unpredictable. The distribution of the amplitude is Gaussian (normal).Figure 3: Flicker Noise in SemiconductorRemember that the RMS value of noise (Vn) equals the standard deviation (σ) of the noise distribution. A random noise source's RMS and peak voltages have the following relationship: VnP-P = 6.6 VnRMS. The crest factor of any signal is the ratio of peak-to-peak to RMS voltage (VnP-P/VnRMS). Because a Gaussian noise source statistically delivers peak-to-peak voltages that are 6.6 times the RMS voltage or higher 0.10% of the time, the crest factor in Equation 1 is 6.6. The likelihood of surpassing 3.3s is 0.001 in this shaded area under the noise voltage density curve in Figure 2. It's crucial to keep in mind that while random signals (like noise) multiply geometrically in a root sum square (RSS) way, associated signals add linearly. Flicker Noise in op AmpSince flicker noise occurs in addition to the thermal noise present in carbon composition resistors, it is frequently referred to as excess noise there. In varied degrees, other resistor types also show flicker noise, with wire coiled having the least. The type of resistor used will not impact the noise in the circuit because flicker noise is proportional to the DC current in the device, thus if the current is kept low enough, thermal noise will predominate. Scaling up resistors to minimize power consumption in an op amp circuit may result in a reduction in 1/f noise at the expense of an increase in thermal noise. Below is the formula to calculate the flicker noise:Figure 4: Flick noise formulaWhere Ke and Ki are proportionality constants (volts or amps) representing En and In at 1 Hz. fMAX and fMIN are the minimum and maximum frequencies in hertz. How to eliminate the flicker noise in op AmpWhat is the best way to deal with this loud, low-frequency noise? With the limited bandwidth, it is almost impossible to try and filter out this noise without changing the important signal. There is yet some hope, though. Although an amplifier's inherent 1/f noise is beyond the control of a system designer, this noise source can be reduced by choosing the right amplifier for the job. The best option is a zero-drift amplifier if 1/f noise is a major problem. Figure 5: zero-drift op amp chartAny amplifier that uses a constantly self-correcting architecture is referred to as "zero-drift" in the industry, regardless of whether it uses an auto-zero topology, a chopper-stabilized topology, or a combination of the two. No matter the specific architecture used, the objective of zero-drift amplifiers is to reduce offset and offset drift. Other dc features, such common-mode and power supply rejection, are also significantly enhanced during the procedure. The fact that the 1/f noise is eliminated during the offset correction procedure is another significant advantage of these self-correcting designs. This noise source occurs at the input and is relatively slow moving, hence it looks to be a component of the amplifiers offset and gets adjusted accordingly.  The working mechanism of flicker noiseBy raising the overall noise level above the thermal noise level, which exists in all resistors, flicker noise is produced. In contrast, wire-wound resistors have the least amount of flicker noise. This noise is merely present in thick-film and carbon-composition resistors, where it is referred to as surplus noise. Charge carriers that are sporadically trapped and released between the interfaces of two materials may be the source of this noise. Because instrumentation amplifiers use semiconductors to record electrical signals, this phenomena is common in those materials.This noise is merely inversely proportional to the frequency. There are various areas in many applications, such as RF oscillators, where noise predominates, and other areas where white noise from sources like shot noise & thermal noise predominates. A correctly constructed system is typically dominated by this low-frequency noise. Equation of flicker noiseSimply put, nearly all electronic components produce flicker noise. In light of this, the noise is discussed in respect to semiconductor devices, notably MOSFET devices. The formula for this noise is S(f) = K/f. Thermal Noise vs. Flicker NoiseThermal NoiseFlicker NoiseIn order to use SAR data both quantitatively and qualitatively, thermal noise must be eliminated by normalizing the backscatter signal throughout the whole SAR image.Several methods, like ac excitation and chopping, can be used to reduce this noise.The lower parasitic resistance components will result in a reduction in the intensity of thermal noise.Wherever the offset voltage of the amplifier is reduced, this noise intensity will be reduced using a chopper or chopper stabilization approach.Anytime current passes through a resistor, thermal noise results.Semiconductors used in instrumentation amplifiers to record various electrical signals typically experience this noise.Johnson noise, Nyquist noise, and Johnson-Nyquist noise are further names for this sound.1/f noise is another name for this noise.Thermal noise is the noise caused by the equilibrium thermal agitation of the electrons in an electrical conductor.Flicker noise is the sound produced by randomly trapped and released charge carriers at the interfaces of two materials. Pros of the flicker noiseAs the noise is low frequency, it will become quieter if the frequency increases.It is an innate noise present in semiconductor devices that is caused by their physics and manufacturing process.The effects are typically seen in electrical components at low frequencies. Cons of flicker noisePerformance can be hampered by this noise in any precision DC signal chain.In all varieties of resistors, the overall noise level can be raised above the thermal noise level.It is frequency dependant. Applications of flicker noiseCertain passive devices and all active electronic components contain this noise.This phenomena typically happens in semiconductors, which are primarily used to store electrical signals in instrumentation amplifiers.The amplifying capabilities of the device are limited by this noise in BJTs.In resistors made of carbon, this noise is present.This noise typically appears in active gadgets because the charge conveys unpredictable behavior. Flicker Noise FAQFlicker noise is measured in what ways?Similar to other types of noise measurement, flicker noise in current or voltage can be measured. The sampling spectrum analyzer instrument extracts a discrete sample from the noise and uses the FFT method to produce the Fourier transform. Low frequencies are beyond the capability of these sensors to accurately measure this noise. Thus, sampling equipment is wideband and has a high noise level. They can reduce the noise by averaging many sample traces. Due to its narrow-band acquisition, conventional-type spectrum analyzer equipment nonetheless have a higher SNR. What should I do to stop the flickering noise?By a chopper stabilization technique that lowers the amplifier's offset voltage, this noise can be effectively eliminated. Flicker Noise: Why Is It Pink?Pink noise, which has a spectral power density reduction of 3 dB per octave, is also known as flicker noise. As a result, the frequency has an inverse relationship with the pink noise band power. Lower power is produced at higher frequencies. Why is flickering called pink noise?One of the most frequently seen signals in biological systems is pink noise. The term originates from the pink appearance of visible light with this power range. White noise, on the other hand, has an equal strength throughout all frequency ranges. How is flicker noise measured?Flicker noise is proportional to the inverse of the frequency, i.e. 1/f and in many applications such as within RF oscillators there are sections in which the flicker noise, 1/f noise dominates and other regions where the white noise from sources such as shot noise and thermal noise dominate.

Overview: The development of lithium-ion batteries as a whole is greatly influenced by their charging systems. The charging technologies, the configuration of the overall charging system, and the charging sequence of electric vehicles are discussed in this article. Evolution of Electric Vehicles The use of electric and hybrid electric vehicles (EVs/HEVs) has grown significantly in recent years, resulting in reduced dependence on fossil fuels and greenhouse gas emissions. This has prompted a wide range of scientific sectors to work on EV/HEV technologies in an effort to replace high-polluting combustion engines. Most research on batteries has been focused on two things: making new chemical compounds to make high-performance batteries and recycling old batteries to avoid big problems with disposal and bad effects on the environment. In engineering equipment, batteries are a frequent source of energy storage. There are many different types of rechargeable batteries with different chemical structures, such as lead acid, nickel cadmium, lithium-ion, etc. These batteries can be chosen based on the design requirements of a storage system, such as capacity, voltage, life, and weight. Rechargeable lithium-ion batteries are used in EVs and HEVs because they have the most power, the highest energy density, and the longest life cycles. This is especially important in light-duty vehicles, where weight is important.  Charging Technologies of Lithium-ion Batteries Lithium-ion batteries are charged optimally with the aid of a battery charger. EV battery chargers are classified as on-board and off-board types based on how fast and how long it takes to charge, as well as when the process starts and ends. On-board chargers are made up of an AC-DC converter for adjusting the voltage and correcting the power factor and a DC-DC converter for regulating the current going into the battery. Because of their size and cost, these chargers only have power levels 1 and 2. Off-board chargers are used to get a high power rate and shorten the time it takes to charge. Fast charging stations use these types of chargers. They have level 3 power and are usually found in public places. A fast charger station is a three-phase grid-connected AC-DC converter. Based on the transformer position for galvanic isolation, there are two common topologies, as shown in Fig. 1. One traditional solution is a big transformer with a line frequency, which makes the charger heavier and less powerful. To solve these problems, a power electronics-based solution is used that uses an isolated DC–DC converter made up of a high-frequency isolated transformer. Most have an active front end (AFE) rectifier that can correct the power factor and an isolated DC-DC converter. A full-bridge DC-DC converter is used to get high power density, efficiency, and reliability. Fig. 1. Fast charger station topologies. Source: IET Power Electronics Most EV control schemes used in fast charge stations are based on the topology of the converter and don't take the chemical structure of the battery into account. But some studies show that charging methods based on electrochemical technologies are more efficient than traditional methods. The constant current–constant voltage (CC–CV) method is one of the most common ways to charge. In CC mode, the battery is charged with a constant current until a certain voltage is reached, at which point the mode changes to CV and stays there until the charge is done. The current drops to a certain value at the end. This method is used most of the time because it is easy to use and cheap. But its performance depends upon the magnitude of the charge current, the time it takes to switch from CC to CV, and the rise in temperature. A high-efficiency charging method that works well can be achieved if these values are properly chosen. System Configuration The power stage and the control unit make up the charger system, as shown in Fig. 2. The power stage has a three-phase AFE rectifier, a full-bridge DC-DC converter, a low-pass filter, and a battery. The control unit has a detect phase unit, an FDA, a current controller, and a modulator unit. A full bridge DC-DC converter is reliable and can control many things at once. This converter is used to charge batteries. It has an H-bridge inverter, a high-frequency transformer, and full-bridge diodes.  Fig. 2. Overall charge system configuration. Source: IET Power Electronics The switching method of a DC-DC converter is based on phase-shifting pulse width modulation. The amplitude of the output voltage is changed by changing the angle between the complementary pulses of the switches. The control unit is made up of four smaller parts: phase difference detection, frequency detection algorithm (FDA), controller, and modulator. By injecting a sinusoidal ripple current with a specific frequency, the phase difference between the current and voltage can be found. Then, the perturb and observe (P and O) algorithm is used to find the FDA unit's optimal frequency, which has the least phase difference. The next step is for the current control unit to make a control signal, which is the duty cycle of the DC-DC converter. In the last step, the modulator uses the control signal to make the right switching pulse. Sinusoidal Ripple Charging Scheme (SRC) A separator and two electrodes make up a Li-ion rechargeable battery, as indicated by the electrochemical model in Fig. 3. Li+ ions are transferred from the cathode to the anode during the charging process. Conventional battery charging schemes, like CV and CC-CV, have problems, such as taking a long time to charge. In the SRC method, an AC current with a DC offset current is used to charge the battery.  Fig. 3. Lithium-ion battery charging process. Source: IET Power Electronics Accordingly, it can cut down on the time it takes to charge a battery by figuring out the optimal ripple current frequency and making sure that the battery's ac impedance is as low as possible. The battery's dynamic model's impedance spectrum backs up this assumption. Compared to the SRC charging method, the square pulse charging method, which is a type of AC ripple current charging, is less efficient, causes the temperature to rise faster, and takes longer to charge.  Summarizing with Key Points: Some of the takeaways from the article are as follows: Rechargeable lithium-ion batteries are used in electric and hybrid electric vehicles because of their high power, high energy density, and prolonged life cycles.Electric vehicle battery chargers are categorized as on-board and off-board, depending on how quickly and how long it takes to charge a battery, as well as when the process begins and ends.On-board chargers only have up to 1 and 2 power levels and are composed of an AC-DC converter and a DC-DC converter. An off-board charger that has a three phase grid-connected AC-DC converter is the fast charging station. They are typically installed in public areas and have level 3 power.An isolated DC–DC converter constructed of an isolated high-frequency transformer solves these concerns with traditional chargers. Full-bridge DC-DC converters provide excellent power density, efficiency, and reliability.The CC–CV charging method is popular because it's cheap and straightforward to use. However, its performance depends on the charge current, time to switch from CC to CV, and temperature rise. The power stage and the control unit make up the charger system. The power stage has a three-phase AFE rectifier, a full-bridge DC-DC converter, a low-pass filter, and a battery. The control unit has a detect phase unit, an FDA, a current controller, and a modulator unit.The control unit has four smaller parts: phase difference detection, frequency detection algorithm, controller, and modulator. The phase difference between the current and voltage can be found by injecting a sinusoidal ripple current with a certain frequency. This blog post is part of a full research article from IET Power Electronics. The featured image is used courtesy of OPEN AI.