Fault protection for a multiphase bridge power converter

Details Fault protection for a multiphase bridge power converter Fault protection for a multiphase bridge power converter

1991-09-10

1993-11-23

Sterrett, J. L.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 87, 363129, H02H 7125

Patent

active

052650022

ABSTRACT:
A semiconductor power conversion system comprising a multiphase bridge circuit which includes semiconductor devices having a controllable firing function and a reverse blocking characteristic, a gate control circuit which gives firing commands to the semiconductor devices, a short circuiting switch in which switching devices having a controllable firing function and a reverse blocking characteristic are connected in parallel with a DC output side of the multiphase bridge circuit, and a protection control device for performing a control for protecting the multiphase bridge circuit. The protection control device includes a device for detecting a commutation failure of the multiphase bridge circuit, and a device in response to the detection of the commutation failure for producing a blocking command for blocking the firing of the semiconductor devices of the multiphase bridge circuit and producing a short-circuiting command for firing the switching device which is short-circuited which bypasses current of the commutation failure. The protection control device further includes a device for detecting ending of a short-circuit based on the ceasing of current conduction of the short circuiting switch and for halting the blocking of the firing of the semiconductor devices of the multiphase bridge circuit.

REFERENCES:
patent: 4429357 (1984-01-01), Hausler et al.
patent: 4670827 (1987-06-01), Schneider
patent: 4757435 (1988-07-01), Wood et al.
patent: 4812729 (1989-03-01), Ito et al.
patent: 5099409 (1992-03-01), Bando et al.

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