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Switch mode battery charging system

  • US 5,166,595 A
  • Filed: 09/17/1990
  • Issued: 11/24/1992
  • Est. Priority Date: 09/17/1990
  • Status: Expired due to Fees
First Claim
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1. A battery charger for a battery, comprisinga controllable power supply means for providing a variable output voltage at varying charging currents;

  • equalize mode sensing means connected to control the power supply means such that when a charging current is sensed which is above a predetermined minimum values, the power supply means causes the charging voltage to begin a continuing increase from an existing voltage to which the battery was charged up to a higher desired target surface charge equalizing voltage for desulfating the battery, said power supply means providing a decreasing charging current at the same time the charging voltage is approaching said equalizing voltage, and when said decreasing charging current drops below said minimum value, said equalize mode sensing means causes, without a controlled time delay, the power supply means to drop down to a charging float voltage for just maintaining a full charge, said equalizing voltage when said charging current reaches the minimum value being higher than said charging float voltage.

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