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Battery charging operation and a detection of a fully charged condition of the charged battery

  • US 5,998,970 A
  • Filed: 06/29/1998
  • Issued: 12/07/1999
  • Est. Priority Date: 07/04/1997
  • Status: Expired due to Term
First Claim
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1. A battery charging method comprising the steps of:

  • performing a plurality of sampling actions for obtaining a plurality of battery voltage data during a predetermined sampling period when a battery is charged;

    storing a minimum value and a maximum value among said battery voltage data in each sampling period;

    renewing a peak value by a largest data among the sampled minimum values;

    obtaining a difference between said peak value and said maximum value at the end of each sampling period; and

    making a judgement that the battery is fully charged when said obtained difference exceeds a predetermined value.

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