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Title: Electric vehicle drive train with contactor protection

A drive train for an electric vehicle includes a traction battery, a power drive circuit, a main contactor for connecting and disconnecting the traction battery and the power drive circuit, a voltage detector across contacts of the main contactor, and a controller for controlling the main contactor to prevent movement of its contacts to the closed position when the voltage across the contacts exceeds a predetermined threshold, to thereby protect the contacts of the contactor. The power drive circuit includes an electric traction motor and a DC-to-AC inverter with a capacitive input filter. The controller also inhibits the power drive circuit from driving the motor and thereby discharging the input capacitor if the contacts are inadvertently opened during motoring. A precharging contactor is controlled to charge the input filter capacitor prior to closing the main contactor to further protect the contacts of the main contactor.
 [1];  [1]
  1. (Roanoke, VA)
Issue Date:
OSTI Identifier:
General Electric Company (Schenectady, NY) IDO
Patent Number(s):
US 5369540
Contract Number:
Research Org:
Ford Motor Co
Country of Publication:
United States
electric; vehicle; drive; train; contactor; protection; traction; battery; power; circuit; main; connecting; disconnecting; voltage; detector; contacts; controller; controlling; prevent; movement; closed; position; exceeds; predetermined; threshold; protect; motor; dc-to-ac; inverter; capacitive; input; filter; inhibits; driving; discharging; capacitor; inadvertently; motoring; precharging; controlled; charge; prior; closing; vehicle drive; traction motor; power drive; electric traction; predetermined threshold; electric vehicle; closed position; drive circuit; drive train; main contact; traction battery; /361/