Charge/discharge control circuit and chargeable electric power s

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries

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320 19, 320 39, H01M 1046

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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.

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