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Power supply charger and method of charging

  • US 7,786,699 B2
  • Filed: 01/25/2006
  • Issued: 08/31/2010
  • Est. Priority Date: 01/25/2005
  • Status: Active Grant
First Claim
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1. A method of charging battery cells divided into at least two battery cell groups, each battery cell group having an associated protector circuit module, the method comprising the steps of:

  • (a) for each battery cell group, applying a voltage across the battery cell group until one condition selected from the group consisting of the voltage of one of the battery cells exceeding a first threshold and the current across the battery cell group dropping below a second threshold, is met;

    (b) for each battery cell group, verifying that each of the of battery cells of the battery cell group has a similar voltage;

    (c) when the verification of the battery cells voltage in step b determines that at least one battery cell of the battery cell group has a voltage departing from the voltage of the other battery cells of the battery cell group by more than a predetermine value, decreasing the voltage of the other battery cells and returning to step a.

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