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Battery charging circuit for charging NIMH and NICD batteries

  • US 5,489,836 A
  • Filed: 02/03/1994
  • Issued: 02/06/1996
  • Est. Priority Date: 05/05/1993
  • Status: Expired due to Fees
First Claim
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1. A battery charging circuit for charging a battery, comprising:

  • a voltage drop detection circuit for producing a first detection signal on detecting a drop in battery voltage with respect to time;

    a peak voltage detection circuit for producing a second detection signal on detecting a period of constant battery voltage with respect to time;

    means for enabling said detection circuits to operate simultaneously and to enable both of said detection circuits to be responsive to the battery voltage from a battery to be charged; and

    battery charging means connected to receive said first and second detection signals, said battery charging means being arranged to charge the battery until either one of said first and second detection signals is generated and to terminate fast charging on receipt of either one of said first and second signals.

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