Battery charger

  • US 5,179,335 A
  • Filed: 10/06/1988
  • Issued: 01/12/1993
  • Est. Priority Date: 10/09/1987
  • Status: Expired due to Term
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First Claim
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1. A charger for charging rechargeable batteries including:

  • (a) means for supplying an electrical charging power at an initial constant predetermined current level to a rechargeable battery initially at a rate in amperes greater than the capacity in ampere-hours of the battery (i.e., greater than 1 C), so as to rapidly charge said rechargeable battery;

    (b) means for detecting the internal resistance free voltage of said rechargeable battery;

    (c) means independent of the battery being charged for providing a preselected reference voltage;

    (d) means for repeatedly interrupting said electrical charging power to said rechargeable battery for a preselected time interval so as to permit the instantaneous detection of the internal resistance free voltage of said battery at a point in time during said interruption of said electrical charging power;

    (e) comparator means for comparing said internal resistance free voltage of said battery with said preselected reference voltage at said point in time and for producing an output logical error signal which is indicative of the value of said internal resistance free voltage compared to said reference voltage;

    (f) logical memory means wherein said output logical error signal from the output of the said comparator means is entered during each preselected time interval; and

    (g) means for gradually reducing said electrical charging power when said internal resistance free voltage of said battery exceeds said preselected reference voltage as indicated by said output logical error signal, whereby the rate of charging of said rechargeable battery at said point in time is reduced so as to maintain said internal resistance free voltage at said preselected reference voltage.

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