Semiconductor unit for protecting secondary battery, battery...

Details Semiconductor unit for protecting secondary battery, battery... Semiconductor unit for protecting secondary battery, battery...

2007-08-31

2010-10-19

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

Reexamination Certificate

active

07816890

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.

REFERENCES:
patent: 6373227 (2002-04-01), Nakashimo
patent: 7486051 (2009-02-01), Zhang
patent: 2001/0026147 (2001-10-01), Nakashimo
patent: 2005/0180067 (2005-08-01), Zhang
patent: 2008/0061743 (2008-03-01), Goto
patent: 2002-186173 (2002-06-01), None
patent: 2005-12852 (2005-01-01), None
patent: 2005-229742 (2005-08-01), None

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