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Method and apparatus for hi-Z mode battery charging

  • US 6,225,782 B1
  • Filed: 11/04/1998
  • Issued: 05/01/2001
  • Est. Priority Date: 11/04/1998
  • Status: Expired due to Term
First Claim
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1. A battery charger for charging a secondary battery connected thereto, comprising:

  • a load simulator circuit for providing a variable load resistance to said battery;

    a current control circuit for regulating a charge current through said battery; and

    a voltage control circuit for regulating a charging voltage across said battery and said load simulator circuit;

    wherein when a battery voltage of said battery is less than a predefined minimum voltage level and said charger activates a high-Z charge mode, said current control circuit regulates said charge current to a first current value by modulating the load resistance of said load simulator circuit, and said voltage control circuit regulates said charging voltage to a first voltage value greater than said battery voltage.

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