Power converter with emergency operating mode for three phase in

Details Power converter with emergency operating mode for three phase in Power converter with emergency operating mode for three phase in

1994-01-07

1996-02-13

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 98, 363132, H02H 7122

Patent

active

054916224

ABSTRACT:
A DC-to-AC power converter that is used to drive a three-phase motor while providing for fail soft and emergency operation. The power converter employs a conventional three half-bridge arrangement of power poles and adds a fourth pole to provide for an emergency operation in the event of failure of one of the three normal poles. The fourth (emergency operation) pole is coupled between a pulse width modulated controller and the neutral wire of the motor and is powered by first and second DC power busses. The controller is configured to disable a failed one of the three normal poles, and to control the fourth pole subsequent to disabling of the failed pole. Fuses or other disconnect devices are also added between the three normal poles and the respective windings of the motor. The present power converter allows continued motor operation at a reduced power level in the event of a failure of one of the power poles. The present invention has application to electric vehicle power systems and may be used in a critical process where temporary operation must be maintained.

REFERENCES:
patent: 4507724 (1985-03-01), Glennon
patent: 4567553 (1986-01-01), Foch et al.
patent: 4959596 (1990-09-01), MacMinn et al.
patent: 5008801 (1991-04-01), Glennon
patent: 5136452 (1992-08-01), Orton
patent: 5280421 (1994-01-01), De Doncker et al.
patent: 5298848 (1994-03-01), Ueda et al.

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