Voltage Regulator Circuit

Functions of the Voltage Regulator

Yes, a boost (step-up) voltage regulator can increase voltage from a lower input level to a higher output level.

2. What is the Difference between a Voltage Regulator and a Transformer?

A voltage regulator maintains a constant output voltage electronically, while a transformer changes AC voltage levels without regulating fluctuations.

3. Is a Voltage Regulator the Same as a Power Supply?

No, a voltage regulator is a component that stabilizes voltage, while a power supply converts and provides electrical power to a circuit.

4. Can a Voltage Regulator Protect Against Power Surges?

Yes, some voltage regulators include built-in protection circuits that help guard against power surges and voltage spikes.

5. What are Some Alternatives to Voltage Regulators?

Some alternatives to voltage regulators include Zener diodes, DC-DC converter modules, and battery management circuits. 

What is an Operational Amplifier

AN operational amplifier is a high-gain electronic voltage amplifier that is used in analog and mixed-signal circuit designs. It amplifies the voltage difference between the inverting and the non-inverting terminals. 

It is very useful for signal conditioning, filtering, and mathematical operations like addition, subtraction, integration, and differentiation. Op-amps’ high input impedance and low output impedance enable efficient signal transfer, which is useful in applications like sensor signal amplification, analog-to-digital conversion circuits, active filters, voltage followers, and control systems.

Operational Amplifier Symbol

AN op-amp symbol is typically represented in a triangular shape pointing towards the right, which symbolizes the direction of signal flow from input to output. It has two input terminals at the base of the triangle, i.e., the inverting input (-) and the non-inverting input (+), and one output terminal at the tip of the triangle. 

The inverting input produces a 180-degree phase shift, and the non-inverting input shows that it maintains the input signal’s phase.

Types of Amplifier

1.Voltage Amplifier

This Op-amp amplifies the voltage difference between the inverting and non-inverting inputs and gives a high voltage gain with very high input impedance and low output impedance. It is used in audio amplifiers, signal conditioning, and sensor interfaces.

2.Current Amplifier

Current op-amp converts the small input current into a larger output current and maintains a constant voltage while boosting current. It is used in current sensing, low impedance loads, and driving LEDs or motors.

3.Differential Amplifier

This type of amplifier has high common-mode noise rejection, which is used to amplify the difference between two input signals. They are used in sensor interfaces, instrumentation, and op-amp input stages.

4. Inverting Amplifier

This type of op-amp produces an output that is inverted ( 180 degrees out of phase) relative to the input and has a simple gain just by using two resistors. It is used in signal inversion, active filters, and phase shifters.

5. Non-Inverting Amplifier

Non-inverting amplifier has a very high input impedance, and the gain is easily set by a resistor network. Its output is an amplified signal that is in phase with the input. It is mainly used in buffers, voltage followers, and sensor signal amplification.

6. Differentiator Amplifier

This type of amplifier has high common-mode noise rejection, which is used to amplify the difference between two input signals. They are used in sensor interfaces, instrumentation, and op-amp input stages.

7. Instrumentation Amplifier

Instrumentation Amplifier precisely amplifies low-level differential signals while rejecting common-mode noise. It has a high input impedance, adjustable gain, and has good common-mode rejection ratio. This is used in medical devices (ECG, EEG), industrial measurement, data acquisition systems, etc.

8. Integrator Amplifier

Integrator op-amp provides an output voltage proportional to the integral of the input signal over time and uses a capacitor in the feedback loop. This is used in analog computers, ramp signal generators, active filters, and signal processing.

9. Comparator

Comparator operates in open-loop mode to compare two input voltages and switch the output to high or low, and it acts like a 1-bit ADC. It is used in zero-crossing detectors, voltage level detection, and PWM circuits.

10. Precision op-amps

Precision op-amps are designed for high accuracy with minimal offset voltage and low bias current. It is used in measurement instruments, reference circuits, and accurate signal conditioning.

11. High speed Op-Amps

High-speed Op-amps deliver fast slew rates and high gain-bandwidth product, and they support wide frequency response. It is used in video signal processing, RF circuits, and fast data acquisition.

12. Low Power Op-Amps

Low-power op-amps consume minimal power while providing essential amplification. This op-amp is optimized for battery-operated and portable devices and is used in IoT devices, wearables, remote sensors, and wireless modules.

Working Principle of an Operational Amplifier

An operational amplifier works by amplifying the voltage difference between its inverting (-) and non-inverting (+) inputs.

When there is a small differential input voltage is applied, the op-amp’s internal differential amplifier stage senses the difference.

The differential amplifier feeds its output to an internal gain stage, which boosts the signal by a very large open-loop gain, typically 10,000 to 1,000,000 times.

Negative feedback is usually applied externally through resistors or capacitors to control and stabilize the gain.

Due to negative feedback, the op-amp automatically adjusts its output so that the voltage difference between the inverting and non-inverting inputs becomes nearly zero.

This self-balancing action allows the op-amp to maintain a linear output response for varying input conditions.

The output voltage is proportional to the difference between the inputs multiplied by the closed-loop gain determined by the external feedback network.

The power supply rails connected to the op-amp provide the necessary energy for amplification, but do not affect the input signal directly.

Because of high input impedance, the op-amp draws minimal current from the input source, ensuring accurate signal processing.

The low output impedance allows the op-amp to deliver significant current to the load without significant voltage drop.

This working principle makes the operational amplifier ideal for applications like amplification, filtering, integration, differentiation, and analog computation.

Applications of Operational Amplifiers

1.      Operational amplifier is used as a voltage amplifier in audio, sensor, and instrumentation circuits to boost weak signals.

2.      For filtering, amplifying, and modifying input signals for ADCs and microcontrollers, an op-amp is used as a signal conditioner.

3.      For precise frequency selection op-amp is used in active filters (low pass, high pass, band pass, and band stop).

4.      Op-amps are essential in comparator circuits for voltage level detection, zero-crossing detection, and pulse generation.

Frequently Asked Questions

1.What is the function of an operational amplifier?

The function of an operational amplifier is to amplify the voltage difference between its inverting and non-inverting inputs.

2. What are the 3 main characteristics of an op-amp?

The three main characteristics of an op-amp are high input impedance, low output impedance, and very high open-loop voltage gain.

3.What is the difference between an inverting and non-inverting op-amp?

An inverting op-amp produces an output that is 180 degrees out of phase with the input, while a non-inverting op-amp outputs a signal that is in phase with the input.

4. Can an op-amp be used as a comparator?

Yes, an op-amp can be used as a comparator by operating it in open-loop mode to compare two input voltages.

5.Why is feedback used in op-amp circuits?

Feedback is used in op-amp circuits to control gain, stabilize the output, and improve accuracy and bandwidth

What is an Inductor?

An inductor is an electronic device that stores electrical energy when current flows through it, in the form of a magnetic field. inductor is made of a coil of conducting wire, usually made of copper and wound around a core, which can be air, iron, or ferrite. 

The main function of an inductor is to resist sudden changes in current. L is the symbol of an inductor in a circuit diagram, and its unit is Henry (H). Inductors play an important role in power management, noise filtering, signal integrity, and electromagnetic interference (EMI) suppression.

Inductor Working Principle

An inductor works on the principle that it stores energy in the form of a magnetic field when an electrical current passes through it. This behaviour is governed by Faraday’s Law of Electromagnetic Induction and Lenz’s Law.

Resistance against the sudden change in current makes the inductor useful for filtering and smoothing electrical signals.

The voltage across the inductor is derived by the formula:

 V(L) = L (dl/dt)

Where:

• V(L) is the voltage across the inductor.

• L is the inductance (Henrys)

• dl/dt is the rate of change of current

Types of Inductors

Inductors are classified based on the core material, construction, and application. Following are the types of inductors:

1. Air Core Inductor

This type of inductor uses non-magnetic material like plastic or ceramic as the core, as this inductor has no magnetic core.

This inductor has low inductance values and has no core saturation, which is ideal for high-frequency applications.

Air inductors are used in RF circuits, high-frequency filters, and communication devices.

2. Iron Core Inductor

To enhance the inductance, these inductor uses laminated iron as the core material.

This inductor has a high inductance value, and core saturation is possible in that inductor.

Used in audio equipment and power supplies (low-frequency applications).

 3.Ferrite Core Inductor

To provide the high magnetic permeability and low electrical conductivity, these inductor uses ferrite (a ceramic compound) as the core.

This inductor has high inductance and can reduce eddy current loss, and is effective in high-frequency circuits.

These inductor is used in switch-mode power supplies, RF transformers, and EMI filters.

4. Toroidal Inductor

A toroidal inductor is usually made of ferrite or powdered iron and is wound on a ring-shaped magnetic core.

It is a compact-sized sized having low electromagnetic interference and has efficient magnetic flux containment.

It is used in power electronics, medical devices, and industrial control systems.

5.Laminated Core Inductor

To reduce eddy current losses, these inductors are constructed using stacked layers of magnetic material like silicon steel.

These inductors are suitable for high power applications, which reduce core losses.

Laminated core inductors are used in transformers, power amplifiers and electric drives.

6.Variable Inductor

The name itself suggests that its inductance can be adjusted manually or electronically.

Used in frequency-selective circuits like radio tuners, oscillators, and signal generators because of its tunable inductance.

7.Multi-layer Chip Inductor (SMD)

This is a compact-sized surface mount device inductor that is built using multilayer technology.

This is a surface mountable device with high frequency performance.

Used in mobile phones, IoT modules, and microcontroller-based PCBs.

Functions of an Inductor

1.      When the current flows through the inductor, the electrical energy stored in the form of a magnetic field.

2.      To pass the specific frequency ranges, inductors are used in filter circuits.

3.      Inductors allow DC current to pass easily by opposing high-frequency AC signals.

4.      Inductors create inductive reactance in AC circuits, used for impedance matching and signal tuning.

5.      They are used in circuits for shaping digital pulses and delaying signals.

6.      Inductors suppress unwanted high-frequency electromagnetic noise in sensitive circuits.

Inductors in Series

When we connect inductors in series,

The total inductance is the sum of the individual inductances, and the inductance increases.

The same current flows through all inductors.

The formula for deriving the total inductance when there is no mutual inductance is:

  L(total) = L1 + L2 + L3 + … + Ln

If the inductors are magnetically coupled, then we consider the mutual inductance as:

 L(total) = L1 + L2 + 2M    (if aiding is there)

 L(total) = L1 + L2 – 2M    (if opposing is there)

M is the mutual inductance between the coils.

The inductors in a series configuration are mostly used in power supplies, filter design, tuned circuits, and choke circuits.

Inductors in Parallel

When inductors are in parallel, the inductors are connected across the same two points, which provides multiple paths for current to flow. When we connect the inductors ina  parallel configuration,

 The voltage across each inductor is the same.

 The total current is the sum of individual currents.

 The formula for deriving the total inductance when there is no mutual inductance is,

    (1/ L(total)) = (1/L1) + (1/L2) + (1/L3) + … + (1/Ln)

If there is mutual coupling, mutual inductance M is considered for deriving total inductance.

 L(total) = (L1L2 – M^2) / (L1 + L2 – 2M)              (when there is aiding)

Mutual inductance can either increase or decrease total inductance based on magnetic coupling orientation.

The inductors in a parallel configuration are used in current sharing, lower inductance requirements, compact power filtering, and impedance control.

 Applications of Inductors

1.      For smooth current flow and filtering, voltage inductors are used in switch-mode power supplies.

2.      For controlling signal frequency, inductors are essential in low-pass, high pass, band pass, and band stop filters.

3.      Inductors are used in transformers to transfer energy between circuits via magnetic coupling.

4.      Inductors are used in RF filters, oscillators, and antenna tuning circuits.

Frequently Asked Questions

1.What is the function of an inductor?

The function of an inductor is to store energy in a magnetic field and oppose changes in current in an electrical circuit.

2.Can an inductor store energy?

Yes, an inductor can store energy in the form of a magnetic field when current flows  through it.

3.Is an inductor used in AC or DC?

An inductor is used in both AC and DC circuits, but it mainly affects AC by opposing changes in current.

4.What is the SI unit of inductance?

The SI unit of inductance is the henry (H).

5.Where are inductors commonly used?

Inductors are commonly used in power supplies, filters, transformers, RF circuits, and energy storage systems.

Traditional power supplies often rely on transformers to step-up or step-down voltage levels. However, in low current applications, transformers can be bulky and inefficient. Using Transformerless power supplies solves this issue by using capacitors and resistors to achieve the desired voltage regulation without the need for a transformer. In this article we will learn how to build a Transformerless Power Supply for Low Current Applications. So let's get started.

Overview of Our Project

In this project, we will be designing a Transformerless Power Supply for low current applications. A transformerless power supply functions as a voltage divider network that takes 220V AC as input and reduces it to the desired lower DC voltage. The AC voltage is rectified through diodes and regulated to a maximum voltage.

Transformerless Power Supply systems are particularly cost-effective alternatives to traditional transformer-based products. By eliminating the need for a transformer, these systems offer a more affordable solution. Transformers are known for being bulky and expensive, making them less practical for certain applications. Many everyday electrical devices, such as LED lights, lamps, laptop and phone chargers, operate at lower DC voltages like 5V, 9V, 12V. Therefore, it is essential to reduce the 220V AC to a lower DC voltage without compromising circuit size or PCB dimensions.

Transformerless Power Supply systems are especially well-suited for powering low current logic circuits and microprocessor circuits. Their compact design and efficient operation make them an ideal solution for a variety of applications.

Lets get onto building our Transformerless Power Supply by getting the required components.

There are usually Capacitive and Resistive types of transformerless power supply. The Capacitive type is more efficient due to its low heat dissipation and minimal power loss. This makes it an ideal solution for circuits which requires very low current, typically in the range of a few milliamperes. 

Considering some factors is essential before designing a power supply:

• Placing a non-polarized capacitor and a resistor in series with the AC power line, a constant current can be maintained through the resistor. In this scenario, the reactance of the capacitor must exceed the resistance of the resistor used.

• The current flowing through resistor R is dependent on the value of capacitor C. The higher the capacitance, the greater the current supplied to the circuit. The current passing through the X-Rated capacitor is determined by the following formula: IRMS = VIN / X

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• The selection of the voltage dropping capacitor is critical and is based on the Reactance of the capacitor and the required current withdrawal.

• The Reactance of the capacitor can be calculated using the formula provided X = 1 / (2 * π * f * C)

• For example, using a 0.47uF capacitor and a mains frequency of 50 Hz, the Reactance X is calculated as follows X = 1 / (2 * 3.14 * 50 * 0.47 * 10^-6) = 6.77 K ohm

• With this information, the current (I) in the circuit can be determined by I = V / X = 230 / 6775 = 34mA

Understanding the principles behind transformerless power supplies and carefully selecting the components involved are crucial steps in designing an efficient and reliable power supply system.

Transformerless Power Supply Circuit

The above circuit shows the implementation of the Transformerless Power Supply

Circuit Explanation

A 0.47uF voltage-dropping capacitor is connected in series with the phase line of an AC power source. This capacitor is non-polarized, meaning it can be connected from either side. In parallel with the capacitor, a 470k ohm resistor is connected to discharge any stored current in the capacitor when the circuit is switched off. This serves to prevent electric shock. This resistor is commonly referred to as a bleeder resistor.

220V AC main is given as the input voltage for our circuit. For safety purposes, it is advisable to connect a fuse. The 220V AC is then rectified through a pair of diodes, specifically 1N4007, functioning as a half-bridge rectifier. The DC voltage dividers are constructed using a combination of resistors to regulate the current flow within the circuit.

To limit the voltage output to 9V, we used a 9V Zener Diode 1N4739A. If a different output voltage such as 5V or 12V is desired, a Zener diode with the appropriate voltage rating must be selected.

The circuit simulation is shown below in Proteus software. Here you can see we are getting a 9V DC output from 220V AC, without using.

Thus we have successfully built and implemented Transformerless Power Supply for Low Current Applications.

Advantages

Let's discuss some Advantages of this Power supply:

1. Compactness: Eliminating the transformer reduces the size and weight of the power supply.

2. Cost-Effectiveness: Transformerless power supply requires fewer components, which reduces the manufacturing cost.

3. Efficiency: Transformerless power supplies can achieve high efficiency levels in low power applications.

Applications

Transformerless power supplies are suitable for powering various low-power devices such as:

• LED lighting circuits

• Small sensors and IOT device

• Battery charging circuits

• Low-power audio applications.

Some Safety Measures To Take While Building This Power Supply

• Please proceed with caution when working with AC mains as it can be extremely dangerous without the proper experience and precautions. Take extreme care when constructing this circuit.

• Ensure that you only use a resistor and Zener diode with a rating of 1 Watt or above (5W). For added safety, consider using a 1 ampere fuse before the X-Rated capacitor, in series with the phase line.

• Do not substitute an X-Rated capacitor with a normal capacitor, as it may result in bursting. If you require more output voltage and current, use a different value of X-Rated capacitor as indicated in the table.

• If needed, an IC voltage regulator can be used instead of a Zener diode for voltage regulation.

• Install a fuse in series with the circuit to protect against overcurrent situations.

• Enclose the circuit in a non-conductive housing to prevent accidental contact with live components.

Conclusion

Finally we have designed and learned how to build a Transformerless Power Supply for our current needs and applications, while building you must follow the safety measures discussed in the article. This Power supply can be used in all low current requirement applications. If you are looking for components like Resistor, Capacitor, Diode to build this Power Supply then Campus Component is the one stop solution for electronic components online, also you can checkout different Power Supply Module and IC from top brands like Mornsun and Abilton at Campus Component.

In this article we will learn how we can build a 5V 3A charger using Solar panel. You can use this charger at any place where power supply is not available. If you are traveling to some remote place and your phone's battery starts to die, but with this your very own DIY solar phone charger, you can use the sun's energy and keep your devices powered, even off the grid.

Let's Start By Gathering The Required Components

Required Components:

• Solar Panel: Choose a 5V solar panel with a proper wattage(usually 3W works fine) that meets your desired charging speed. Higher watts solar panel charges faster.

• TP4056 Module: The TP4056 1A Li-Ion Battery Charging Board Type C with Current Protection is a compact module, specifically designed for the charging of individual 3.7V 1 Ah or higher lithium-ion (Li-Ion) cells. Utilizing the TP4056 charger IC and DW01 battery protection IC, this module delivers a charge current of 1A before automatically ceasing the charging process upon completion. Moreover, if the battery voltage falls below 2.4V, the protection IC intervenes by disconnecting the load, safeguarding the cell from operating at excessively low voltages. The module also acts as a shield against overvoltage and reverse polarity connections. This module regulates the charging process for your lithium-ion battery.

• Lithium-ion (Li-ion) Battery: Select a 3.7V Li-ion battery with a capacity (mAh) that determines how long you can charge your devices.

• DC-DC 5V 3A USB Boost Converter Module: This fast Charge Module features USB and Type-C ports, accommodating a voltage input range of 10.5-32V while consistently delivering a 5V/3A output. This versatile module supports multiple charging protocols, making it an ideal choice for diverse applications such as fast mobile phone charging, solar charging setups, etc. With a long operation and resilience against voltage fluctuations, it ensures stable and reliable performance over time. This module increases the voltage from the battery to the required 5V for USB charging.

• Connecting Wires

Let's Start Making The Connections

Begin by connecting the components as follows:

1. Battery to TP4056 Module:

Connect the positive terminal of the battery to the "B+" pin of the TP4056 module and Connect the negative terminal to the "B-" pin.

2. Solar Panel and TP4056 Module:

Connect the positive and negative terminals of the solar panel to the "IN+" and "IN-" pins of the TP4056 module, respectively.

3. TP4056 and USB Output(Boost Converter):

Connect the positive output pin of the TP4046 module (usually labeled "OUT+") to the positive pin of a USB A female connector. Connect the negative output pin ("OUT-") to the negative pin of the USB connector.

Lets Now Test our Circuit

• Place the solar panel under sunlight and observe the charging LED on the TP4056 module.

• Confirm the LiPo battery is charging by checking its voltage.

• Connect a device(smart phone) to the USB output and check the output voltage using a Multimeter.

Safety Measures

• Choose components compatible with each other and based on your desired charging speed and battery life.

• Prioritize safety by following proper handling and disposal guidelines for Li-ion batteries.

• Consider seeking help from a qualified electronics professional. Our team at Campus Component provides end to end service for your project.

Applications

• Charge your phone, tablet, or other USB-powered devices in the car.

• Power small electronics like cameras, speakers, or portable LED lights.

• Create a sustainable charging solution for emergency kits.

• Emergency power backup

• Energy solutions for remote areas.

Conclusion

Thus by following the above simple steps you can build your own solar power portable USB charger. By some more tweaking you can even make a wireless charger from this setup. Experiment with different solar panel sizes and battery capacities for optimal results. Building your own solar phone charger is rewarding and has multiple practical applications.

Campus Component is your one stop solution for all the electronic components online requirements in building 5V 3A USB Charger. To know more visit at our website today!

Power Supply for ESP32

We will discuss the integration of a power supply for the ESP32 Board. Additionally, we will add a Boost Converter Circuit to enable the use of a 3.7V Lithium-Ion Battery for powering the ESP32. Since Lithium-Ion Batteries can discharge, we will integrate a Battery Charger Circuit along with a Battery Management System. Many Lithium-Ion/Lithium Polymer Batteries can only charge up to 4.2V, which is low for the ESP32 Board. 

Therefore, we need to increase the battery voltage from 2.8V-3.7V to 5V. This necessitates the use of a compact Boost Converter Module build with inductors, ICs, and resistors. To facilitate battery charging and management, we will use the TP4056 Battery Charger Module. Alternatively, we can also power the circuit using a 9V/12V DC Adapter. The LM7805 Voltage Regulator IC restricts the voltage to 5V. If you are not going to use a battery for power, you can utilize the DC Power Adapter or a 9V Battery.

ESP32 Power Requirement

The ESP32 Board’s operating voltage is between 2.2V to 3.6V. But we can supply 5V from the Micro-USB port. For applying 3.3V there is already an LDO voltage regulator on the module to keep the voltage steady at 3.3V. ESP32 can be powered using Micro USB port and VIN pin (from external supply).

The power requirement of ESP32 is 600mA of that ESP32 pulls only 250mA during the RF transmissions. When it is performing boot or wifi operation it’s drawing more than 200mA current. Thus supplying power from Micro-USB Cable is not enough for ESP32 Board when we need to add multiple sensors or modules to the Board. This is because Computer USB port can provide less than 500mA of current. Check more on power requirements of ESP32 here ESP32 Datasheet.

Hardware Requirements for ESP Power Supply Project

Following are the components required for making this ESP32 Power Supply project. You can get all the components from our Campus Component store.

The above shown is the Step-Up DC-DC Boost converter module which provides 5V DC stable voltage output for various input ranges between 1.5V to 5V. This small tiny circuit boosts the voltage level and provides the amplified stabilized 5V output. This module operates at a frequency of 150KHZ. It utilizes varying amounts of current to generate a balanced output for different input ranges.

Read more about Boost Converter

TP4056 Battery Charger Module

The TP4056 module is designed specifically for charging rechargeable lithium batteries through the constant-current/constant-voltage (CC/CV) charging technique. Apart from ensuring the safe charging of lithium batteries, the TP4056 BMS Board incorporates essential protection mechanisms for lithium batteries. It is compatible with both USB power and adapter power supplies. Also because of its internal PMOSFET architecture and anti-reverse charging path, there is no need for external isolation diodes. 

TP4056 Module Datasheet.

Power Supply for ESP32 with Battery Charger & Boost Converter

The circuit can be powered by using two methods, one with 9V/12V DC Adapter and other with 3.7V Lithium-Ion Battery.

To power the board through the DC Jack, we've added here a DCJ0202 Female Jack. Also we have added 470uF and 100uF Electrolytic Capacitors that serve to lower the DC fluctuations and eliminate voltage spikes. The LM7805 Voltage Regulator IC is capable of handling input voltages ranging from 7V to 35V, although it's advisable to stay within the 15V limit. Higher input voltages result in increase in heat dissipation thus we have to add a larger heat sink. Connecting the Voltage regulator's output to the Vin pin of the ESP32 and grounding it ensures the module can be powered using a 9V/12V DC Adapter or a 9V Battery.

Alternatively, if opting not to utilize a DC Adapter for ESP32 power, a 3.7V Lithium-Ion or Lithium Polymer Battery can be used. Utilizing the Boost Converter Module, the 3.7V is increased to 5V, operating within the 2.8V to 4.2V input range. The boosted 5V is connected to a switch, and the switch is linked to the 5V Vin pin of the ESP32. The Battery terminal is also connected to the output terminal of the TP4056 Battery Charger Module, allowing the battery to be charged using a 5V MicroUSB Data Cable. 

Conclusion

Thus by including a Battery Charger and Boost Converter to power up the esp32, we can create a flexible and efficient power for the unique requirements of the ESP32 platform. Reach out to the Campus Component- an electronics parts suppliers today, if you are building a Battery charger, Boost converter and looking for electronic components such as ESP32 and other microcontrollers from trusted brands such as Mornsun, Espressif, AIT, IKSEMI other components.

A buck-boost converter is a switch-mode DC-DC converter that provides an output voltage greater than or less than the input voltage. The process of reducing the voltage then its input voltage is called Buck and where the output voltage is increased in terms of its input voltage then it is called as Boost. The arrangement of a buck-boost converter circuit is similar to that of the buck converter and boost converter circuits; it’s a combination of both buck and boost circuit.

This blog post will guide you through the process of building a Buck-Boost Converter, also we will implement an Error correction feedback loop using ESP32.

Objectives

To build a controller to switch between the Buck-Boost operations 

Control the output voltage by varying the Duty cycle by providing required PWM value from microcontroller.

Fundamentals of Buck-Boost Converter

Buck Converter

Buck converter is a dc-to-dc converter designed to perform the step down conversion to perform the step down conversion of applied dc input.

Boost Converter

Boost converter performs the step up conversion of voltage from its input to load.

• So as per the working of Buck and Boost Converter the Step down and Step-up of the voltage at the output depends on the Duty Cycle(square wave)  applied to the switch (i.e.  mosfet ) by varying PWM value.

Formula for Voltage Calculation

For Buck Converter

Vo = Vin * Duty Cycle 

For Boost Converter

Vo =11-Duty Cycle*Vin

• As shown in the block diagram, we will integrate ESP32’s PWM to change the Duty cycle which is applied to the switch(mosfet) to control the switching frequency. 

• This PWM pin will take the input from the Potentiometer which is connected to one of the Analog pins of ESP32 Microcontroller, this varied analog value will be fed to the PWM pin through the code, and this value will be mapped according to the required PWM.

Hardware Requirements

2. Potentiometer

3. Inductors and Capacitors

4. MOSFETs

5. Diodes

6. Jumper Wires

System Flowchart

In the ever-evolving landscape of electronics, the demand for efficient and compact power supplies has led to the widespread use of Switch Mode Power Supplies (SMPS). SMPS offers higher energy efficiency and smaller form factors compared to traditional linear power supplies. In the following article, we will see how to build a switch mode power supply for practical use for various applications.

Before moving to the building of SMPS, let us understand what is an SMPS?

What is SMPS?

SMPS, which is called Switch Mode Power Supply is an electronic circuit that converts Electrical power from one voltage to another. SMPSs are also known as switching power supplies or switchers. 

Operating Principle of Switch Mode Power Supplies

• SMPS utilizes sophisticated switching devices like MOSFETs, which continually switch on and off at high frequencies.

• Energy storage components such as capacitors and inductors play a crucial role in supplying power during the non-conduction state of the switching device.

• The operational principle of Switch Mode Power Supplies involves the rapid switching of a power semiconductor device on and off.

• This distinctive approach to energy flow control results in a more efficient conversion of electrical energy, marking a departure from the continuous operation seen in linear power supplies.

Efficiency and Size

• SMPS boasts higher efficiencies, reaching up to 90%, making them a preferred choice for various applications.

• Their compact size is a notable characteristic, contributing to their widespread use in computers and other sensitive electronic equipment.

How to Build a Switch Mode Power Supply and its Working

Let us now understand the building of Switch mode Power Supply

The design and working of SMPS is divided into various sections and stages:

Input Stage (Stage 1)

• The AC input supply with a frequency of (50-60) Hz is directed to the rectifier and filter circuit.

• The output, characterized by various fluctuations, requires a capacitor with sufficient capacitance to handle input variations.

• The unregulated DC output is then fed into the central switching section of the SMPS for regulation; this section operates without a transformer for the step-down in input voltage supply.

Switching Section (Stage 2)

• Comprising fast-switching devices such as a Power transistor or a MOSFET, this section toggles ON and OFF in response to voltage variations.

• The resulting output is directed to the primary of a smaller, lighter, and highly effective transformer, facilitating voltage step-down.

• The efficiency of this transformer surpasses alternative step-down methods, contributing to a higher power conversion ratio.

Output Stage (Stage 3)

• The output from the switching section undergoes rectification and filtering to achieve the desired DC voltage.

• The regulated output voltage is then supplied to the control circuit.

Control Unit (Stage 4)

• The control unit is primarily focused on feedback and encompasses various sections.

• The internal control unit includes an oscillator, amplifier, sensor, etc.

• The sensor detects the output signal and provides feedback to the control unit, ensuring isolation of signals to prevent sudden spikes from affecting the circuitry.

• A reference voltage and the signal are input into the error amplifier, which functions as a comparator, comparing the signal with the required signal level.

• The subsequent stage involves controlling the chopping frequency, with the final voltage level adjusted based on the inputs to the error amplifier.

• The oscillator generates a standard PWM wave with a fixed frequency.

 Applications of Switched Mode Power Supply (SMPS)

• Deployment in servers, power stations, and personal computers for diverse electronic applications.

• Integration into vehicles for battery charging purposes.

• Application in factories and industries to meet power requirements.

• Implementation within the railway system and security systems for efficient power management.

Advantages of Switched Mode Power Supply

• Smaller physical footprint and reduced weight compared to alternative power supply options.

• Demonstrates superior power efficiency, typically ranging from 60 to 70 percent.

• Possesses strong resistance against external interference, ensuring stable performance.

• Offers a wide range of output options, catering to diverse voltage requirements.

• Generates minimal heat during operation, contributing to improved energy efficiency.

Disadvantages of Switched Mode Power Supply

• The design and operation of SMPS are more intricate and may require specialized knowledge.

• Tends to exhibit higher output ripple, and regulation may fall short of expectations.

• Primarily limited to applications requiring step-down regulation.

• May introduce high-frequency electrical noise into the system, potentially impacting other components.

• Leads to harmonic distortion, which can be a concern in certain applications.

Conclusion:

By following the above guidelines you will be able to make your own Switch Mode Power Supply. If you are looking for SMPS from brands such as Mornsun reach out to Electronic component supplier - Campus Component today!. We have an exciting range of SMPS as per your application needs such as Mornsun LM50 SMPS, Mornsun LM150 SMPS, Mornsun LI120 SMPS and much  more.

As the world shifts towards more greener and more sustainable transportation, electric vehicles(EVs) are rapidly gaining popularity. We can see a rapid transition happening around us as people are turning more towards electric vehicles, the demand for EV charging stations is growing rapidly.

To cater the need, EV charging stations play an important role, and Mornsun, a leading power supply solutions provider has emerged as a partner in powering the future of EV charging stations.

Mornsun’s power supply solutions for EV charging stations are designed to be high-efficiency, reliable, and cost-effective. They’re also designed to meet the latest safety standards.

Importance of Power Supply Solutions in EV Charging Stations

Electric vehicle charging stations are complex systems that require a steady and efficient power supply. The charging process demands high reliability, safety, and the ability to handle varying charging demands. Mornsun provides state-of-the-art power supply solutions that ensure seamless operation and enhanced user experience for EV owners. 

AC/DC Power Supply Design Requirements for EV Charging Stations

There are Two Different Types of EV Charging Stations:

1. AC Charging Station

Further AC chargers are divided into AC level 1 EVSE and AC level 2 EVSE which deliver AC power to the charger of the vehicle. AC charging stations are generally small, flexibly installed, and it takes up to 2-8 hours for a full charge depending on the vehicle. They are very suited for small passenger electric vehicles, mostly used for residential applications, as well as fleet, multifamily, shopping malls, offices and other commercial space.

2. DC Charging Station

DC charging station is a high-powered Level 3 charger. It delivers DC power to the battery. A DC charging station is usually able to charge the battery to 80% of the charging state within 30 minutes. DC charging stations are suitable for fast DC charging of private electric vehicles, electric buses, hybrid buses, taxis, engineering vehicles, etc., and are mostly used in the public and workplaces.

Mornsun Offers a Variety of Power Supply Solutions for EV Charging Stations, including:

• AC-DC power supplies for Level 1 and Level 2 charging.

• DC-DC power supplies for DC fast charging.

• Isolated power supplies for safety.

• Enclosed power supplies for outdoor applications.

1. Mornsun's Isolated Power Modules

Safety is the most important parameter in EV charging stations. Mornsun's isolated power modules are designed to provide galvanic isolation, preventing electrical hazards and ensuring the safety of users and vehicles. 

2. Mornsun's AC-DC Converters

Mornsun's AC-DC converters offer unmatched flexibility and scalability, catering to the diverse needs of EV charging stations. Whether it's a public charging station or a private charging facility, Mornsun's power supply solutions are able to suit different power levels and charging station sizes. Their flexible and scalable approach allows for easy expansion as the demand for EV charging infrastructure grows.

AC/DC Converter for Electric Vehicle Charging Stations

Below Table shows Type of charging stations and required AC/DC power modules and DC/DC power modules which are provided by Mornsun to meet the power demands of Different Ev chargers.

The 1-15W AC-DC converter LS series and 3-30W AC-DC converter LD-R2 series offer compact size, a wide input voltage range of 85~305VAC that help meet the key requirements of power design for the EV control system. High efficiency up to 90% coupled with the extended -40℃ to +85 ℃ operating temperature range. They also deliver good EMC protection with conducted emission and radiated emission meeting CISPR32/EN55032 CLASS B, which makes them highly reliable in some extreme conditions when charging.

Benefits of Using Mornsun's Power Supply Solutions for EV Charging Stations

• High Efficiency: Mornsun's power supplies are highly efficient, which can help you save money on energy costs.

• Reliability: Mornsun's power supplies are designed to be reliable and durable resulting in function for long duration.

• Cost-Effectiveness: Mornsun's power supplies are competitively priced, so you can get the best value for your money.

• Safety: Mornsun's power supplies are designed to meet the latest safety standards, so they are safe for use in EV charging stations.

Conclusion

As electric vehicles revolutionize the automotive industry, the need for robust and efficient EV charging stations becomes increasingly evident. Mornsun's power supply solutions for EV charging stations offer high reliability, safety, efficiency, and scalability. By choosing Mornsun's solutions, charging station operators can contribute to a sustainable future while providing EV owners with a seamless charging experience.

If you are building an EV charging station and looking for best in class power supply solutions for the system from Mornsun, reach out to us at Campus Component today, and get latest updates on Mornsun’s products!