Semiconductor device for protecting rechargeable battery

Details Semiconductor device for protecting rechargeable battery Semiconductor device for protecting rechargeable battery

2006-07-31

2010-06-01

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S135000, C320S136000

Reexamination Certificate

active

07728556

ABSTRACT:
A semiconductor device for protecting a rechargeable cell at least from excessive discharge current due to over discharge of the rechargeable cell, includes (a) a first excessive discharge current detection circuit configured to detect first excess of a voltage at an electric current detection terminal exceeding a first voltage level (Vs3), (b) a second excessive discharge current detection circuit configured to detect second excess of the absolute voltage at the electric current detection terminal exceeding a second voltage level (Vs4) higher than the first voltage level, (c) a delay circuit configured to cause each of the first and second excessive discharge current detection circuits to delay output by a predetermined delay time, and (d) a delay reducing circuit configured to produce a delay time reducing signal for reducing the delay time at a predetermined ratio.

REFERENCES:
patent: 2002/0050806 (2002-05-01), Fujiwara
patent: 2003/0137883 (2003-07-01), Chun
patent: 2005/0068008 (2005-03-01), Zhang
patent: 2002-176730 (2002-06-01), None
patent: 2002-186173 (2002-06-01), None
patent: 3597618 (2004-09-01), None
patent: 2005-12852 (2005-01-01), None

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