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Battery charging system employing multi-mode low power fast charge process

  • US 6,215,282 B1
  • Filed: 06/19/2000
  • Issued: 04/10/2001
  • Est. Priority Date: 06/19/2000
  • Status: Expired due to Term
First Claim
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1. A battery charging method, comprising operations of:

  • applying a constant current to the battery at a first time;

    determining when battery voltage has risen to a target voltage, and substantially thereupon applying a fast charge voltage to the battery;

    determining a second time when battery charge current has decreased to a target charge current;

    substantially at the second time, determining an elapsed time between the first and second times;

    computing a proposed overcharge time comprising a multiplicative product of the elapsed time and an adjustment factor;

    computing an actual overcharge time comprising the proposed overcharge time, limited to a prescribed maximum time; and

    applying an overcharge voltage to the battery for a length of time substantially equal to the actual overcharge time.

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