Set battery charging condition detecting apparatus
First Claim
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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Accused Products
Abstract
An over-charge determining circuit provided for every unit cell generates, a cell over-charge detection signal which becomes high level when a cell voltage is higher than an upper limit value of an allowable voltage range thereof which is set as the threshold value voltage. The threshold value voltage is changed to a lower limit value of the allowable voltage range with which the cell over-charge detection signal surely becomes high level. Even when an output of an AND circuit for obtaining a logical product of the cell over-charge detection signals should become high, if an over-charge determining circuit of which output is fixed to the low level due to a fault of the like exists, the output of the AND circuit becomes low.
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Citations
8 Claims
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1. A charging condition detecting apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A charging condition detecting apparatus comprising:
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a voltage comparator 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 exceeds, in a side going out of an allowable voltage range, a threshold value voltage which is set to a boundary value of the allowable voltage range of the cell voltage;
a logical sum calculation circuit for obtaining a logical sum of outputs of voltage comparator provided for every unit cell;
a threshold value voltage changing circuit for changing, depending on an external command, the threshold value voltage to an inspection value with which the comparator provides an output of the active level from the boundary value when the unit cell voltage is within the allowable voltage range; and
a logical product calculation circuit for obtaining a logical product of the outputs of the voltage comparator provided for every unit cell. - View Dependent Claims (8)
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Specification