Full Bridge Inverter and Half Bridge Inverter

why there are harmonics component available in the output inverter ?

Hi Ali,

The question is a little too open ended. The topology in itself doesn't dictate the harmonic content of the output. It comes down to how you are inverting the output.

If you go the el-cheapo route and do a simple square wave inversion, you would end up with the whole spectrum of harmonics associated with a square wave(do a Fourier series on square wave for the exact harmonics). If you go the quasi-square wave route, you will eliminate the third harmonic making it easier to filter the output(smaller components) before feeding your load. If you go the Sine modulated PWM approach, your harmonics go down even further and will essentially be shifted to your modulating frequency.

It all comes down to how closely your modulated wave 'fits' a true Sine wave

Best,
Sree Harsha