A flyback configuration is the preferred topology in SMPS application designs mainly because it guarantees complete isolation of the output DC from the input mains AC. Other features include low manufacturing cost, simpler design and uncomplicated implementation. The low current DCM version of flyback converters which include output specification lower than 50 watt are more […]
Power Electronics
How to Repair a Switch-Mode-Power-Supply (SMPS)
In this post we try to diagnose a burnt SMPS circuit and try to troubleshoot and repair the circuit. The shown unit is a cheap readymade Chinese make SMPS circuit. This article is written as per the request made by Mr. Kesava. My SMPS got Burnt The below attachment is 12v 1.3 amps SMPS for […]
Learn to Make Buck Converter Using Arduino
In this project we are going to step down 12v D.C to any D.C value between 2 and 11volts. The circuit which steps down the D.C voltage is known as buck converter. The output voltage or step down voltage needed is controlled using a potentiometer connected to arduino. By Ankit Negi INTRODUCTION TO CONVERTERS: There […]
110V, 14V, 5V SMPS – Detailed Diagrams with Illustrations
In this post we learn how to apply the IC L6565 for making a compact multi purpose 110V, 14V, 5V SMPS circuit using minimum number of external components. Implementing quasi-resonant ZVS flyback The IC L6565 from ST Microelectronics is designed as a current-mode primary controller chip, to specifically suit quasi-resonant ZVS flyback converter applications. The quasi-resonant […]
LC Oscillator Working and Circuit Diagram Details
In this post we are going to understand how LC oscillator circuits functions and we will be constructing one of the popular LC based oscillator – Colpitts oscillator. By Girish Radhakrishnan What are Oscillators Electronic oscillators are used in most of our daily used electronic gadgets ranging from digital clock to high end core i7 […]
Power Factor Correction (PFC) Circuit – Tutorial
The post details the different methods of configuring a power factor correction circuit or a PFC circuit in SMPS designs, and explains the best practice options for these topologies so that it complies with the modern PFC restriction guidelines. Designing efficient power supply circuits have never been easy, however in the course of time researchers […]
Electronic Ballast for Twin 40 Watt Fluorescent Tubes
In this article we learn how to build a simple yet extremely reliable electronic ballast circuit for driving or operating two 40 watt fluorescent tubes, with an active power correction. Courtesy: https://www.irf.com/technical-info/appnotes/an-995a.pdf Main Electrical Features of the IC International Rectifier Control ICs are monolithic power integrated circuits suitable for operating low-side and high-side MOSFETs or […]
Calculating Inductors in Buck Boost Converters
In this post we try to understand the method of dimensioning or calculating inductors in buck boost SMPS circuits in order to ensure an optimal performance from these devices. In a few of my earlier posts we comprehensively studied regarding how SMPS buck and boost converters work, and we also deduced a few fundamental formulas […]
How Boost Converters Work
A boost converter (also called step-up converter) is a DC to DC converter circuit which is designed to convert an input DC voltage into an output DC voltage with a level that may be much higher than the input voltage level. However the process always conserves the relation P = I x V, which means […]
Ferrite Core Material Selection Guide for SMPS
In this post we learn how to select ferrite core material with the correct specifications for ensuring proper compatibility with a given SMPS circuit design Why Ferrite Core Ferrite is a wonderful core substance for transformers, inverters and inductors in the frequency spectrum 20 kHz to 3 MHz, owing to the benefits of reduced core […]
What’s PWM, How to Measure it
PWM stands for pulse width modulation which signifies the variable nature of the pulse widths that may be generated from a particular source such as a discrete IC, MCU, or a transistorized circuit. What’s PWM In simple terms a PWM process is nothing but switching ON and OFF a supply voltage at a particular rate […]
6V to 220V Boost UPS for Satellite TV Modems
The post explains a simple boost converter UPS circuit for supplying an uninterruptible power to satellite TV set top boxes so that the offline recording is never allowed to fail during power outages. The idea was requested by Mr. Aniruddha Mukherji. Technical Specifications I think you are a fellow bong like me, I am an […]
SMPS for Powering LCD Monitors
This power supply functions with a broad input voltage range from 90 to 265 V AC and produces a dual output in the form of 5 V / 2.5 A, and 14.5 V / 1 A. The Circuit Layout The great aspect of this source is its minimal power consumption, optimized power consumption in idle […]