Simple Inverter Circuit Diagram with Multivibrator

Introduction

There are many applications where a 230 V a.c. at 50 Hz is needed to operate an appliance in the absence of mains supply. Devices to supply this kind of power are known as inverters. They draw electrical energy from a battery (a rechargeable battery in most cases), chop the d.c. and then step up the a.c. voltage by a step-up transformer. The chopping frequency in most cases, is about 50 Hz. Frequency accuracy and stability is not important so long the device is not used to power a frequency sensitive appliance such as a synchronous motor of a clock. In this article, we will discuss about a simple inverter circuit diagram with symmetrical multivibrator using a pair of 2n3055 transistors.

Medium size inverters are used to operate things such as emergency lights, TV receivers and computers. High capacity units are used to power lights and fans in a house during failure of the mains supply. These inverters are designed to start up automatically and immediately as soon as the failure of mains supply occurs, and switch off themselves when the mains supply is restored. When the mains supply is available, a built-in charger circuit keeps the battery in its fully charged state.

Simple Inverter Circuit Diagram

This project can be designed using a few basic components. The circuit diagram of this project is shown below.

Simple Inverter using Symmetrical Multivibrator Circuit Diagram — **Simple Inverter using Symmetrical Multivibrator**

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Components List of Simple Inverter Circuit Diagram

Following is the list of all components used in this project:

2N3055 Transistor = 2
SL100 Transistor = 2
4.7uf Capacitor = 1
0.47uf Capacitor = 1
15k Resister = 2
220 Ohms Resister = 2
6-0-6V x 230V Transformer = 1

Working Explanation of Simple Inverter Circuit Diagram

Previously the inverters uses a mechanical vibrator. Today, most inverters use a 50 Hz square wave generator ( e.g., a multivibrator), which drives switching transistors. One example of this kind of inverter is shown in the above given circuit diagram.

Transistors T1 and T2 form a free-running multivibrator. Their outputs are given as base drives to transistors T3 and T4. The collector currents of these transistors feed the two halves of the center-tapped primary winding of the power transformer.

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