This a pwm circuit. pwm circuit is very necessary part for the control of the semiconductor switches like IGBT, MOSFET etc. to make converters like ac-dc, dc-dc, dc-ac, several types of converters are necessary. in all converters control circuit this pwm circuit can be used. -This is a pwm circuit. pwm circuit is very necessary part for the control of the semiconductor switches like IGBT, MOSFET etc. to make converters like ac-dc, dc-dc, dc-ac, several types of converters are necessary. in all converters control circuit this pwm circuit can be used.