Battery chargers

  • US 3,890,556 A
  • Filed: 09/24/1973
  • Issued: 06/17/1975
  • Est. Priority Date: 10/14/1972
  • Status: Expired due to Term
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First Claim
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1. A battery charging control circuit in which the state of battery charge is assessed by measurement when the battery charging current is interrupted and including means operative during an interruption to time a period of time, means responsive to the end of said period to register the battery voltage, means to compare the registered battery voltage with the battery voltage registered earlier during an interruption of charging current and means responsive to the result of said comparison to control the charging current thereafter applied to the connected battery.

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