Three phases of phase lack protection circuit

Published:2011/3/27 22:45:00 Author:Jessie | Keyword: Three phases, phase lack protection | From:SeekIC

This is a kind of protection circuit used for three-phase three-wirepower phase lack, A, B and C lack any phase, light-coupler output level is lower than comparator's reversed-phase input terminal's benchmark voltage, comparator output low level, blockade PWM drive signal, andcut offpower. Comparator input polarity fluctuant, also can use a high level blockade PWM signal. This phase lack protection circuit uses high light-coupler isolation, safe and reliable, RP2, RP1 used to adjust phase lack protection movement threshold.



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