Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1993-11-17
1998-04-21
Tso, Edward
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 19, 320 39, H01M 1046
Patent
active
057421480
ABSTRACT:
A chargeable power supply which has a charge/discharge control circuit is provided in which the service life of a secondary cell is prolonged. A voltage dividing circuit, an overcharge voltage detection circuit, an overdischarge detection circuit and a control circuit are connected in parallel to the secondary cell. The control circuit receives signals indicating the condition of the secondary cell from the overcharge/overdischarge voltage detection circuits and outputs a signal for controlling a switch circuit for disconnecting the secondary cell from external equipment, or to stop a charging operation by an external power source. The control circuit also controls a switching element provided in series with the voltage dividing circuit and reduces a current which flows through the dividing circuit. A current limiting means is provided to limit the current consumption of the charge/discharge control circuit. In one embodiment, a the current limiting device is a switching element provided in series with the voltage dividing circuit. In another embodiment, the current limiting device is an error amplifier with a latching function provided in an overcharge detecting circuit.
REFERENCES:
patent: 3543043 (1970-11-01), Dunn
patent: 5142215 (1992-08-01), Mathison
Patent Abstracts of Japan, vol. 17, No. 473 (E-1423) 27 Aug. 1993.
Patent Abstracts of Japan, vol. 17, No. 13 (E-1304) 11 Jan. 1993.
Ruska, "MicroElectronic Processing: An Intro to the Manufacture of Integrated Circuit", 1987, pp. 105-108.
Mead et al., "Intro to VLSI Systems," 1980 p. 51.
Grebene, "Bipolar and MOS Analog Integrated Circuit Design," p. 142, no date.
Kojima Yoshikazu
Mukainakano Hiroshi
Shimoda Sadashi
Sudo Minoru
Takashina Takayuki
Seiko Instruments Inc.
Tso Edward
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