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Three phase three-wire system phase failure protection circu

2016-09-26 09:58  
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Three phase three-wire system phase failure protection circuit
This is a three phase three-wire system power supply phase failure protection circuit, if lacking any phase of A, B, C, the optic coupler output level is lower than the reference voltage of comparator reverse-phase input terminal, comparator outputs low level, to lock PWM drive singal, cuting off the power supply. If changing the comparator input polarity, it also can use high level to lock PWM singal. This phase failure protection circuit adopts optical coupler to isolate heavy current, it is secure and reliable, RP1, RP2 is used to adjust phase failure protection motion threshold value.