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High Frequency SPWM generation with PIC16F876A

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Hello every body,can somebody please help me to generate the SPWM signal at high frequency (28KHz) which I have to use for controlling an H-Bridge made up by MOSFET in DC-AC Converters.

I read Tahmid's blog but the frequency of the signals Which I am generating are making the MOSFET very hot because I replaced the board which was used previously and this were operating at 28KHz,so can anybody help me to generate the SPWM with high frequency?

Thanks.
 

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