PROTECTIVE SEMICONDUCTOR APPARATUS FOR AN ASSEMBLED BATTERY, A BATTERY PACK INCLUDING THE PROTECTIVE SEMICONDUCTOR APPARATUS, AND AN ELECTRONIC DEVICE
First Claim
1. A protective semiconductor apparatus for protecting an assembled battery including N secondary cells connected in series, the protective semiconductor apparatus comprising:
- a disconnection detecting circuit including, for each of the N secondary cells, a voltage-sensing resistor configured to divide a voltage of the secondary cells;
a reference voltage; and
a first comparator configured to compare a voltage obtained by the voltage-sensing resistor with the reference voltage; and
a circuit configured to connect an internal resistor having a resistance value smaller than a resistance value of a corresponding one of the voltage-sensing resistors in parallel to the corresponding voltage-sensing resistors successively and selectively at predetermined time intervals,wherein the disconnection detecting circuit is configured to detect disconnection between the N secondary cells and the protective semiconductor apparatus based on an output from the first comparator when the internal resistor is connected in parallel to the corresponding voltage-sensing resistor.
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Accused Products
Abstract
A protective semiconductor apparatus for protecting an assembled battery including N secondary cells connected in series includes a disconnection detecting circuit including, for each of the N secondary cells, a voltage-sensing resistor dividing a voltage of a corresponding one of the secondary cells, a reference voltage, and a first comparator comparing a voltage obtained by the voltage-sensing resistor with the reference voltage. The protection semiconductor apparatus also includes a circuit connecting an internal resistor having a resistance value smaller than a resistance value of a corresponding one of the voltage-sensing resistors in parallel to the corresponding voltage-sensing resistors successively and selectively at predetermined time intervals. The disconnection detecting circuit detects disconnection between the N secondary cells and the protective semiconductor apparatus based on an output from the first comparator when the internal resistor is connected in parallel to the corresponding voltage-sensing resistor.
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Citations
18 Claims
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1. A protective semiconductor apparatus for protecting an assembled battery including N secondary cells connected in series, the protective semiconductor apparatus comprising:
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a disconnection detecting circuit including, for each of the N secondary cells, a voltage-sensing resistor configured to divide a voltage of the secondary cells; a reference voltage; and a first comparator configured to compare a voltage obtained by the voltage-sensing resistor with the reference voltage; and a circuit configured to connect an internal resistor having a resistance value smaller than a resistance value of a corresponding one of the voltage-sensing resistors in parallel to the corresponding voltage-sensing resistors successively and selectively at predetermined time intervals, wherein the disconnection detecting circuit is configured to detect disconnection between the N secondary cells and the protective semiconductor apparatus based on an output from the first comparator when the internal resistor is connected in parallel to the corresponding voltage-sensing resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification