This document will show you the basic theory of DC to AC inverters, about the circuit’s works, the calculation to build DC to AC inverter and more. The sample of inverter circuit diagram also included in this document.

INTRODUCTION

Transistor dc to ac inverters are useful in a wide variety of applications. They power the complicated electronic systems of orbiting satellites and cool astronaut’s suits. They are widely used to operate gyros and other airborne instruments. They provide AC power to operate the electric shaver in your car. Inverters may become increasingly important and widely used with the further development of economic low voltage DC power sources such as solar cells, nuclear cells, fuel cells, etc.

It should be noted that rectifications of the inverter output results in DC to DC convertion. Transistor inverters as described here in are, therefore, the “heart” of transistor DC to DC converters. However, when used as converter, to provide rectified output the frequency and waveshape of the transistor circuit are unimportant, except as they relate to the efficienty and smoothing of the rectified output.

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The ABC's of DC to AC Inverters

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This is a basic and very simple low power inverter to convert 12V DC to 120V AC. How much power this simple inverter can handle the load depends the transformer current value and transistors you use for Q1 and Q2.

Inverter 12V DC to 120V AC Component List:
C1, C2 : 68 uf, 25 V Tantalum Capacitor
R1, R2 : 10 Ohm, 5 Watt Resistor
R3, R4 : 180 Ohm, 1 Watt Resistor
D1, D2 : HEP 154 Silicon Diode
Q1, Q2 : 2N3055 NPN Transistor (see “Notes”)
T1 : 24V, Center Tapped Transformer
Misc:
Wire, Case, Receptacle (for output)
Fuses, Heatsinks, etc.

Note: Don’t try to run inductive loads (motors) using this inverter.
More explanation about how its work and the component list about this simple power inverter, visit this page

Circuit Notes:

• A 12 V car battery can be used as the 12V source.
• Use the POT R1 to set the output frequency to 50Hz.
• For the transformer get a 12-0-12 V, 10A step down transformer. But here the 12-0-12 V winding will be the primary and 220V winding will be the secondary.
• If you could not get a 10A rated transformer , don”t worry a 5A one will be just enough. But the allowed out put power will be reduced to 60W.
• Use a 10 A fuse in series with the battery as shown in circuit.
• Mount the IC on a IC holder.
• Remember, this circuit is nothing when compared to advanced PWM inverters.This is a low cost circuit meant for low scale applications.

More explanation about this inverter circuit, please visit this page