Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Reexamination Certificate
2007-12-04
2010-11-23
Tso, Edward (Department: 2858)
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
C320S106000, C320S107000, C320S137000
Reexamination Certificate
active
07839122
ABSTRACT:
There is provided a charging apparatus that, even when an AC adapter is connected and there is heavy load, makes it possible to reduce heat produced due to the power loss of a control transistor, reduce cost and area for implementation, and improve safety. Charging apparatus100has: P-channel MOS transistors M1and M2that control charging current; current detecting resistance Rs that is connected to current output terminals of P-channel MOS transistors M1and M2and detects the charging current; switch130that is arranged on a path that bypasses current detecting resistance Rs; and load300that receives power supply from battery200without involving current detecting resistance Rs when switch130is closed. Current difference amplifier120amplifies the detected voltage of current detecting resistance Rs, comparator160compares the output voltage of current difference amplifier129with the reference voltage, and thereby, when current flowing into battery200is equal to or less than a predetermined value, switch130is closed and current detecting resistance Rs is short-circuited.
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English language Abstract of JP 2003-348766.
Arai Shigenori
Takada Kazuhisa
Watabe Ryou
Yoshida Masato
Diao M'Baye
Greenblum & Bernstein P.L.C.
Panasonic Corporation
Tso Edward
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