Filters play a key role in the inverter driven loads. It is mainly used for two reasons. They are necessary to convert the inverter output (i.e., square wave) into pure sinusoidal wave and to eliminate the higher order harmonics. Conversion of square wave in to sine wave. Here Filters are used to eliminate higher order harmonic where as lower order harmonics are eliminated by using SPWM technique. The basic design of the LC filter is shown in the figure 5.1