Battery protective device and semiconductor integrated...

Details Battery protective device and semiconductor integrated... Battery protective device and semiconductor integrated...

2008-05-07

2010-06-15

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C361S090000, C320S136000

Reexamination Certificate

active

07737664

ABSTRACT:
A battery protective device that protects against battery damage and semiconductor destruction from overdischarge and overcharge of the battery. Resistance across switching elements is controllable to prevent current leakage through parasitic dipole elements in the integrated circuit. Current is detected with an overdischarge detecting circuit and an overcharge detecting circuit. Direction of the current to/from the battery is detected by discharge overcurrent and charge overcurrent detecting circuits. Switching discharge FETs and charge FETs are enabled as independently controlled, ON-OFF parallel switching elements, interposed in series in the charge/discharge current path of the battery. Only a part of the discharge or charge switching FETs can be turned ON and OFF for accurate current control in accordance with the detected current and its direction.

REFERENCES:
patent: 6320355 (2001-11-01), Terada
patent: 6977513 (2005-12-01), Matsunaga
patent: 7068012 (2006-06-01), Geren et al.
patent: 7190148 (2007-03-01), Ooshita et al.
patent: 2006/0139006 (2006-06-01), Wang et al.
patent: 10290530 (1998-10-01), None
patent: 2002204534 (2002-07-01), None

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