Charge protection circuit with timing function

Details Charge protection circuit with timing function Charge protection circuit with timing function

2011-03-29

2011-03-29

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S149000, C320S155000, C324S426000, C324S532000, C340S636100, C340S636210

Reexamination Certificate

active

07915863

ABSTRACT:
A charge protection circuit with a timing function is disclosed. The circuit includes a charge protection module constituting of a second switch, a second capacitor and a control integrated circuit (IC). The second switch Q2is switched to turn on or turn off to charge or discharge the lithium-ion battery. The second capacitor configured for setting a delay time of a Ct terminal of the control IC, thus to prevent the battery from being overcharged. The circuit further includes a charge timing circuit configured for predetermining a time threshold value. When the charge time reaches the time threshold value, the charge timing circuit outputs a second high level signal to charge the second capacitor. The second capacitor triggers the control IC to turn off the second switch, thereby terminating the charge of the battery body.

REFERENCES:
patent: 6285165 (2001-09-01), Terada
patent: 6340880 (2002-01-01), Higashijima et al.
patent: 6642694 (2003-11-01), Yamanaka et al.
patent: 6768289 (2004-07-01), Fujiwara
patent: 2006/0164041 (2006-07-01), Ooshita et al.

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