Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1996-10-07
1998-02-03
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 2, 320 61, H02J 704
Patent
active
057148694
ABSTRACT:
A power source apparatus includes a power generation device, a battery and an overcharge protection circuit. The overcharge protection circuit includes a shunt circuit, including a switching device for short-circuiting the power generation device when an input signal is at an `L` level. A reverse current protection circuit prevents an electric current from reversely flowing to the power generation device and/or the shunt circuit. A voltage detection section detects the voltage of the load or between the poles of the battery. An overcharge judgement section outputs an `L` level to the switching device when the voltage value detected by the voltage detection section surpasses a preset voltage value. When the voltage across the battery surpasses a predetermined value, the power source apparatus is short-circuited by the overcharge protection circuit, and therefore it is possible to prevent overvoltage from being applied to the load. In addition, even when the battery is disconnected, oscillation of the overcharge protection circuit can be prevented.
REFERENCES:
patent: 4266178 (1981-05-01), Asakawa
patent: 4382211 (1983-05-01), Staler
patent: 5153497 (1992-10-01), Eiden
patent: 5585991 (1996-12-01), Williams
Fukae Kimitoshi
Takehara Nobuyoshi
Tamechika Masanari
Canon Kabushiki Kaisha
Law Patrick B.
Wong Peter S.
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