Detection and isolation circuit for a failed bridge power rectif

Details Detection and isolation circuit for a failed bridge power rectif Detection and isolation circuit for a failed bridge power rectif

1994-10-21

1996-09-03

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 47, 361 52, H02H 300

Patent

active

055529526

ABSTRACT:
A protection circuit for a bridge rectifier having a plurality of ac inputs coupled to a plurality of line voltages, and a dc output, comprises monitoring circuits coupled to the line voltages for monitoring the line voltages and generating sequential line-to-line voltage signals, conduction circuits coupled to the monitoring circuits for conducting that portion of each of the sequential line-to-line voltage signals having a given polarity, the conducting circuits generating sequential half wave voltage signals having a given polarity magnitude, and discriminating circuits coupled to the conducting circuits for discriminating a faulted rectifier by monitoring the given polarity magnitude of each of the sequential half wave voltage signals. The discriminating circuits generate a protection signal in response to one of the magnitudes of the sequential half wave voltages signals being less than a threshold.

REFERENCES:
patent: 3986103 (1976-10-01), Frankenberg et al.
patent: 4376968 (1983-03-01), Wueschinski et al.
patent: 4442396 (1984-04-01), Hucker
patent: 4475150 (1984-10-01), D'Atre et al.
patent: 4620272 (1986-10-01), Fulton et al.

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