Changing the dc sgnal to ac signal is done for te purpose of load regulations, such as motor speed, heater and lamp. Inverter work by rectification first then converted again a 1 phase signal. The output sinosoidal PWM (SPWM) type unipolar 220 volts from input 24 volt voltage. Unipolar SPWM generation microcontroller with programming. number counts (resolutions) period are set amount in ...