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Method and apparatus for monitoring the self discharge of a secondary battery upon completion of a charge cycle

  • US 5,982,148 A
  • Filed: 06/22/1998
  • Issued: 11/09/1999
  • Est. Priority Date: 06/22/1998
  • Status: Expired due to Term
First Claim
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1. A battery charger for charging a secondary battery connected thereto, comprising:

  • a charger controller having a high side sense input terminal connected to a high side of said battery, a low side sense input terminal connected to a low side of said battery, and a switch control output terminal; and

    a first switch connected to said low side of said battery and a ground node, said first switch controlled by said switch control output terminal of said charger controller;

    wherein after fully charging said battery, said charger controller monitors a terminal voltage of said battery by creating a high impedance node at said low side of said battery, regulating a battery high side voltage to a predetermined value lower than a maximum allowable terminal voltage for said battery, and measuring a battery low side voltage.

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