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Battery charger for charging a plurality of batteries

  • US 5,003,244 A
  • Filed: 05/09/1989
  • Issued: 03/26/1991
  • Est. Priority Date: 05/09/1989
  • Status: Expired due to Term
First Claim
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1. A battery charging apparatus for charging a plurality of batteries, comprising:

  • a charging voltage supply source;

    a transformer coupled to the charging voltage supply source, said transformer having a primary winding and a plurality of secondary winding circuits;

    wherein each secondary winding circuit is coupled across a different one of a plurality of batteries and includes a secondary winding and a semiconductor switching element;

    wherein all the secondary windings have an equal number of turns;

    a transistor coupled to the primary winding, and a voltage sensor and charger control coupled across one of the secondary windings and to the transistor, said voltage sensor and charger control controlling the switching of the transistor in dependence on voltage sensed across said secondary winding; and

    wherein said voltage supply supplies DC voltage, such that the transformer acts as a flyback circuit.

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