Apparatus and method for step-charging batteries to optimize charge acceptance

  • US 5,589,757 A
  • Filed: 06/07/1995
  • Issued: 12/31/1996
  • Est. Priority Date: 01/26/1994
  • Status: Expired due to Term
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First Claim
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1. A method of charging a battery, comprising the steps of:

  • applying an electrical charging output to the battery in dependence on a base charging level;

    adjusting the charging output to provide a plurality of charging levels comprising an upper pair and a lower pair of charging levels, each of the charging levels in the upper pair distinct in magnitude from one another and each of the charging levels in the lower pair distinct in magnitude from one another;

    measuring a charge input to the battery at each of the charging levels comprising the upper pair and at each of the charging levels comprising the lower pair;

    calculating a lower differential from the difference in the charge inputs at the two charging levels comprising the lower pair of charging levels, and calculating an upper differential from the difference in the charge inputs at the two charging levels comprising the upper pair of charging levelscomparing the lower differential and the upper differential; and

    adjusting the base charging level based on the differential comparison.

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