IN2014MU01132AIN1132MU2014AIN2014MU01132AIN 2014MU01132 AIN2014MU01132 AIN 2014MU01132AIN 1132MU2014 AIN1132MU2014 AIN 1132MU2014AIN 2014MU01132 AIN2014MU01132 AIN 2014MU01132A
Authority
IN
India
Prior art keywords
comparator
microcontroller
given
circuit
pulse width
Prior art date
Application number
Inventor
Usufe Shaikh
Shweta U Shetty
Vinod Deshmukh
Original Assignee
Larsen & Toubro Ltd
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Publication date
Application filed by Larsen & Toubro LtdfiledCriticalLarsen & Toubro Ltd
Priority to IN1132MU2014priorityCriticalpatent/IN2014MU01132A/en
Publication of IN2014MU01132ApublicationCriticalpatent/IN2014MU01132A/en
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.