What is an Inverter? Let’s have some industry spice….

What is an Inverter? Let’s have some industry spice…. J


Power inverter is a device which converts the electrical power from DC form to AC form using electronic circuit. Its typical application is to convert battery voltage in to conventional AC voltage allowing you to use electronic devices when an AC power is not available.

There are basically three types of inverters:

Square wave

Modified sine wave

 And      pure sine wave inverters


The square wave inverter is simplest and least expensive type of inverter, but nowadays it is practically not being used commercially because of poor quality of power.

The modified sine wave topology (which is actually modified square wave topology) produces a square wave with some dead time bands between positive ad negative half cycles. They are suitable for many electronic loads and these are the most popular low-cost inverters in the market today.

Pure sine wave inverter produces AC voltage with less harmonic distortion (typically below 3%). This kind of inverters have been used when there is a need for clean sine wave outputs for some sensitive devices such as medical equipment, laser printers and stereos etc.


Most commercial DC-AC inverter circuits use the same basic concept: a low DC voltage from the input source is stepped-up to a higher dc link corresponding to the peak value of the desired AC voltage. The second power stage then generates an AC voltage by using full bridge or half-bridge configuration. Least cost square wave circuits may also use push pull converter with step-up transformer. Output voltage can controlled either in square wave mode or in pulse width modulation (PWM) mode.  In PWM pure sine wave circuits, the output voltage and frequency are controlled by varying the duty cycles of high frequency pulses and the chopped voltage passes through an output low-pass LC filter to produce a clean sinusoidal output.



1. Power inverters- Theory of operation and analysis.




2. DC-AC isolated inverter with quasi square wave output- Reference Design




3. DC/AC converter unit for LCD unit




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