H - Electricity – 02 – M
Patent
H - Electricity
02
M
H02M 7/219 (2006.01) H02H 7/125 (2006.01) H02M 7/23 (2006.01)
Patent
CA 2051030
Disclosed is 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 a reverse parallel relationship to each other and are connected in parallel with a DC output side of the multiphase bridge circuit, and 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 for operating upon the detection of the commutation failure, to produce a blocking command for blocking the firing of the semiconductor devices of the multiphase bridge circuit and to produce a short-circuiting command for firing that one of the switching devices constituting the short-circuiting switch which bypasses current of the commutation failure. The protection control device further includes a device for detecting a short-circuit release 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.
Bando Akira
Kawai Tadao
Kita Eizo
Mitsuhashi Keiichi
Nakagawa Hiroto
Hitachi Ltd.
Kirby Eades Gale Baker
The Kansai Electric Power Co. Inc.
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