Recently, it becomes imperative to have a circuit that covert the DC to AC due to the growing need of transferring the power from a DC supply to an AC load. The Inverter is an electrical device that converts direct current (DC) to alternating current (AC). the converted AC can be at any required voltage by using step up or step down transformers. The output frequency of the inverter also can be controlled by the rate at which the switching devices are turned on or off, in the other words by the pulse frequency of the base, or gate.
Inverters are used for many applications as in situations where low DC sources such as batteries, solar panels or fuel cells must be converted so that devices can run off of AC power. One example of such a situation would be converting electrical power from car battery to run a laptop, TV or cell phone.
In this project, a single phase bridge inverter is used. As you can see from the schematic Q1 and Q3 are triggered simultaneously and so are Q2 and Q4 respectively. The triggering circuit is Astable Multivibrator with transistors switching at frequency of 50HZ. The output of the inverter is connected to a step up transformer to boost the input voltage from 12v to 110v, then a filtered is followed the transformer to remove the harmonics.