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Set battery charging condition detecting apparatus

  • US 20030015995A1
  • Filed: 07/01/2002
  • Published: 01/23/2003
  • Est. Priority Date: 07/12/2001
  • Status: Active Grant
First Claim
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1. A charging condition detecting apparatus comprising:

  • a first voltage comparator which is provided for every unit cell forming a chargeable/dischargeable set battery to provide an output of an active level when a cell voltage across the unit cell is higher than a first threshold value voltage set to an upper limit value of an allowable voltage range of the cell voltage;

    a second voltage comparator which is provided for every unit cell to provide an output of the active level when the cell voltage of the unit cell is lower than a second threshold value voltage set to a lower limit value of the allowable voltage range;

    a first logical sum calculation circuit for generating an over-charge detection signal by obtaining a logical sum of the outputs of the first voltage comparator;

    a second logical sum calculation circuit for generating an over-discharge detection signal by obtaining a logical sum of the outputs of the second voltage comparator;

    a threshold value voltage changing circuit for changing, depending on an external command, the first threshold value voltage to a first inspection value lower than the lower limit value of the allowable voltage range and also changing the second threshold value voltage to a second inspection value higher than the upper limit value of the allowable voltage range;

    a first logical product calculation circuit for generating a first fault detection signal by obtaining a logical product of outputs of the first voltage comparator; and

    a second logical product calculation circuit for generating a second fault detection signal by obtaining a logical product of outputs of the second voltage comparator.

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