SEMICONDUCTOR UNIT FOR PROTECTING SECONDARY BATTERY, BATTERY PACK HAVING THE SEMICONDUCTOR UNIT BUILT-IN AND ELECTRONIC APPARATUS USING IT
First Claim
1. A semiconductor unit for protecting a secondary battery by detecting overcharge, overdischarge, charging overcurrent, discharging overcurrent or short circuit current, comprising:
- a current detecting terminal converting a charging current into a negative voltage with respect to a negative electrode potential (ground potential) of the secondary battery when the secondary battery is charged, converting a discharging current into a positive voltage with respect to the negative electrode potential of the secondary battery when the secondary battery is discharged, and detecting the charging/discharging current; and
a test signal generating circuit generating a first test signal when a voltage of the current detecting terminal is reduced to a first negative voltage which does not occur in a normal operation state of the semiconductor unit, and generating a second test signal when the voltage of the current detecting terminal is reduced to a second negative voltage which is lower than the first negative voltage.
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Accused Products
Abstract
A semiconductor unit for protecting a secondary battery has a current detecting terminal converting a charging current to a negative voltage with respect to a negative electrode potential (ground potential) of the secondary battery when the secondary battery is charged, converting the charging current to a positive voltage with respect to the negative electrode potential (ground potential) of the secondary battery when the secondary battery is discharged, and detecting the charging/discharging current; and a test signal generating circuit generating a first test signal when the voltage of the current detecting terminal lowers to a first negative voltage which does not occur in a normal operation state of the semiconductor unit, and generating a second test signal when the voltage of the current detecting terminal lowers to a second negative voltage lower than the first negative voltage.
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Citations
13 Claims
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1. A semiconductor unit for protecting a secondary battery by detecting overcharge, overdischarge, charging overcurrent, discharging overcurrent or short circuit current, comprising:
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a current detecting terminal converting a charging current into a negative voltage with respect to a negative electrode potential (ground potential) of the secondary battery when the secondary battery is charged, converting a discharging current into a positive voltage with respect to the negative electrode potential of the secondary battery when the secondary battery is discharged, and detecting the charging/discharging current; and a test signal generating circuit generating a first test signal when a voltage of the current detecting terminal is reduced to a first negative voltage which does not occur in a normal operation state of the semiconductor unit, and generating a second test signal when the voltage of the current detecting terminal is reduced to a second negative voltage which is lower than the first negative voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification