Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Patent
1998-11-20
2000-04-25
Tso, Edward H.
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
320136, H01M 1046
Patent
active
06054841&
ABSTRACT:
A charge/discharge control circuit is provided for an electric power source apparatus in which a service life is prolonged. A voltage dividing circuit, an overcharge voltage detection circuit, an overdischarge voltage detection circuit and a control circuit are connected in parallel to a secondary cell which is an electric power source, wherein the control circuit detects a condition of the secondary cell from the overcharge/overdischarge voltage detection circuits and outputs a signal Vs for controlling a power supply to an external equipment and a charge by an external power source and controls a switching element provided in series with the voltage dividing circuit and reduces a current which flows through the voltage dividing circuit.
REFERENCES:
patent: 5493197 (1996-02-01), Eguchi et al.
patent: 5602481 (1997-02-01), Fukuyama
patent: 5760570 (1998-06-01), Nagai et al.
Kojima Yoshikazu
Mukainakano Hiroshi
Shimoda Sadashi
Sudo Minoru
Takashina Takayuki
Seiko Instruments Inc.
Tso Edward H.
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