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Automatic battery charger

  • US 4,207,513 A
  • Filed: 02/10/1978
  • Issued: 06/10/1980
  • Est. Priority Date: 02/10/1978
  • Status: Expired due to Term
First Claim
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1. A battery charging system for charging storage batteries of any ampere-hour rating without adjustment, said system comprising a power source for applying a charging voltage to a battery to be charged, first means responsive to battery charging current for initially controlling said charging voltage to maintain a predetermined maximum charging current until the battery cell voltage has reached a predetermined value, means responsive to battery voltage per cell for thereafter controlling said charging voltage to maintain the battery cell voltage at said predetermined value until the charging current falls to a predetermined minimum value, second means responsive to the charging current for controlling the charging voltage to maintain said minimum charging current, timer means for terminating the charging operation after the minimum charging current has been maintained for a predetermined time, and means actuable in response to a rise in battery current above said minimum current value for resetting said timer means whereby the minimum charging current will be maintained for said predetermined time after charging current again falls to said predetermined minimum value.

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