IMPROVED POWER SUPPLY FOR I TO V CONVERTER

摘要

Disclosed isan improved microcontroller based pulse width modulation circuit and method thereof for a circuit breaker.The proposed invention is used for supply voltage regulation in microcontroller based electronic trip unit of circuit breakers. The microcontroller used has an internal analog comparator and digital to analog converter (DAC). The potential divider circuit is used to step down the supply voltage and this is given to the positive terminal of the comparator. The internal DAC of microcontroller is used to generate a threshold voltage and it is given as input to the negative terminal of the comparator. The output of the comparator is given to MOSFET gate. The Pulse Width Modulation (PWM) pulses generated by comparator are used for power supply regulation.