Apparatus for discerning faulty switching device

Details Apparatus for discerning faulty switching device Apparatus for discerning faulty switching device

1989-05-04

1990-04-10

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 56, H02H 7125

Patent

active

049165984

ABSTRACT:
An apparatus for detecting a faulty switching device of a current-supply type full-bridge inverter includes current transformers connected to each pair of series connected switching devices of the inverter. A differential amplifier is provided for subtracting one detected current value output by one current transformer from another detected current value output by another current transformer. A rectifier is provided for smoothing and rectifying the output of the differential amplifier, and a comparator is provided for comparing the smoothed and rectified output of the rectifier with a reference value.

REFERENCES:
patent: 3611108 (1971-10-01), Susumu et al.
patent: 4126819 (1978-11-01), Stobbe et al.
patent: 4777579 (1988-10-01), Jahns et al.

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