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Battery charging system for electric vehicles

  • US 5,633,577 A
  • Filed: 06/06/1995
  • Issued: 05/27/1997
  • Est. Priority Date: 06/06/1994
  • Status: Expired due to Fees
First Claim
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1. A battery charging system comprising:

  • a main battery for driving a vehicle;

    an auxiliary battery for driving an auxiliary device of the vehicle, the battery charging system charging the main battery and the auxiliary battery when a supply of electric power is received from a commercial AC power source;

    a rectification circuit for rectifying electric power from the commercial AC power source;

    a converter for converting the rectified electric power to AC input power;

    a transformer to transform the AC input power, the transformer including an output winding having a first part to output first AC power and a second part to output second AC power;

    a first output part, connected to the first part of the output winding of the transformer, to rectify the first AC power and to supply the first AC power to the main battery; and

    a second output part, connected to the second part of the output winding of the transformer, to rectify the second AC power and to supply the second AC power to the auxiliary battery; and

    a converting Circuit, included in the first output part, to convert, when the battery charging system does not receive the electric power from the commercial AC power source, electric power of the main battery to the second AC power to provide electric power from the main battery to the auxiliary battery through the first part and the second part of the output winding.

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