Single-power-transistor battery-charging circuit using...

Details Single-power-transistor battery-charging circuit using... Single-power-transistor battery-charging circuit using...

2011-08-16

2011-08-16

Koval, Melissa (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

Reexamination Certificate

active

07999512

ABSTRACT:
A charge/discharge protection circuit protects a battery from inadvertent shorting on a charger node that can connect to a charger or to a power supply of a portable electronic device. A single n-channel power transistor has a gate that controls a channel between the battery and the charger node. The gate is connected to the charger node by a gate-coupling transistor to turn off the power transistor, providing battery isolation. The gate is driven by a voltage-boosted clock through a switch activated by an enable signal. The enable signal also activates a grounding transistor to ground a gate of the gate-coupling transistor. A comparator compares voltages of the charger and battery nodes, and the compare output is latched to generate the enable signal. An inverse enable signal activates a second switch that drives the voltage-boosted clock to the gate of the gate-coupling transistor to turn off the power transistor.

REFERENCES:
patent: 5789900 (1998-08-01), Hasegawa et al.
patent: 6246214 (2001-06-01), Oglesbee
patent: 6670790 (2003-12-01), Stellberger
patent: 2004/0174142 (2004-09-01), Olson
patent: 2007/0035278 (2007-02-01), Mullett et al.

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