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AC Power Control with Thyristor – Pulse Skipping using triac with PIC16F877A

AC Power Control with Thyristor – Pulse Skipping using triac with PIC16F877A

Here’s the output with 5 complete cycles on out of every 7 complete cycles:

Fig. 5 – PSM – 5 cycles on out of 7 complete cycles
Green: Input AC
Yellow: AC Output after pulse skipping modulation
Pink: Gate Drive signal
Here’s the output with 1 complete cycle on out of every 3 complete cycles:
Fig. 6 – PSM – 1 cycle on out of 3 complete cycles
Green: Input AC
Yellow: AC Output after pulse skipping modulation
Pink: Gate Drive signal

Here’s the output with all complete cycles on:



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 Fig. 7 – PSM – all cycles on
Green: Input AC
Yellow: AC Output after pulse skipping modulation
Pink: Gate Drive signal
Here in this article, I’ve talked about pulse skipping modulation – also known as cycle control or burst fire – with some background information on triacs. I’ve shown how to implement pulse skipping modulation / cycle control / burst fire with a PIC and also how to calculate the RMS voltage of the output. I hope I’ve been able to explain this important topic to you clearly and hope that you can now successfully build your own power control circuits using pulse skipping modulation (or cycle control or burst fire) with triacs.

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