Battery unit having means for preventing over-discharge

Details Battery unit having means for preventing over-discharge Battery unit having means for preventing over-discharge

2005-04-26

2005-04-26

Tibbits, Pia (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

Reexamination Certificate

active

06885168

ABSTRACT:
A protection method for preventing battery cells from over-discharging and being overcharged, a control circuit, and a battery unit are provided. In the protection method, when a set signal “1” is supplied to a set terminal, a flip-flop outputs “1”. The gate of a discharge control FET then becomes “1”, so that the discharge control FET is OFF regardless of a discharge control signal supplied from a voltage monitor circuit. When a reset signal “1” is supplied to a reset terminal, the flip-flop outputs “0”. The discharge control FET is then switched on and off in accordance with the output of a discharge control circuit of the voltage monitor circuit. In this manner, battery cells connected to an electronic device do not over-discharge, even when they are left unused for a long period of time. Thus, the battery unit can be prevented from deteriorating and shortening the life thereof.

REFERENCES:
patent: 5155428 (1992-10-01), Kang
patent: 5304915 (1994-04-01), Sanpei et al.
patent: 5477130 (1995-12-01), Hashimoto et al.
patent: 5477133 (1995-12-01), Earle
patent: 5493197 (1996-02-01), Eguchi et al.
patent: 5547775 (1996-08-01), Eguchi et al.
patent: 5612616 (1997-03-01), Earle
patent: 5617018 (1997-04-01), Earle
patent: 5619126 (1997-04-01), Lang
patent: 5680027 (1997-10-01), Hiratsuka et al.
patent: 5801514 (1998-09-01), Saeki et al.
patent: 5808444 (1998-09-01), Saeki et al.
patent: 5905361 (1999-05-01), Saeki et al.
patent: 5963019 (1999-10-01), Cheon
patent: 6008629 (1999-12-01), Saeki et al.
patent: 6046575 (2000-04-01), Demuro
patent: 6172485 (2001-01-01), Fujita et al.
patent: 6492791 (2002-12-01), Saeki et al.
patent: 3611484 (1986-04-01), None
patent: 36 11 484 (1987-10-01), None
patent: 93 19 881 (1994-08-01), None
patent: 19618236 (1996-12-01), None
patent: 0 622 863 (1994-02-01), None
patent: 2 279 802 (1995-01-01), None
patent: 2 292 845 (1996-03-01), None
patent: 2 308 024 (1997-06-01), None
patent: 2 308 025 (1997-06-01), None
patent: 2 308 026 (1997-06-01), None
patent: 5-3635 (1993-01-01), None
patent: 5-81756 (1993-11-01), None
patent: 07-029554 (1995-01-01), None
patent: 08-079982 (1996-03-01), None
patent: 09-017455 (1997-01-01), None
patent: 09-050826 (1997-02-01), None
patent: 10-215524 (1998-08-01), None
patent: 11-242966 (1999-09-01), None
patent: 11-339862 (1999-12-01), None
patent: WO 9410718 (1994-05-01), None
patent: WO 9834316 (1998-08-01), None
patent: WO 9834316 (1998-08-01), None
MAXIM Cost-Saving Multichemistry Battery-Charger System MAX846A; Maxim Integrated Products, Sunnyvale, CA; Sep. 1996: 12 pages.
Chinese Office Action dated Sep. 5, 2003.

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