Charge/discharge circuit having a simple circuit for protecting

Details Charge/discharge circuit having a simple circuit for protecting Charge/discharge circuit having a simple circuit for protecting

1994-02-17

1996-09-10

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 39, 320 5, H01M 1044, H02J 700

Patent

active

055549195

ABSTRACT:
A charge/discharge circuit includes a charge/discharge path consisting of only an N-channel MOS transistor connected between a first terminal to be connected to a secondary ceil and a second terminal to be connected to an external DC voltage supply and a load. A first comparator is connected to the first terminal for detecting whether or not the secondary cell is in an overdischarged condition. A second comparator is also connected to the first terminal for detecting whether or not the secondary cell is in an overcharged condition. A third comparator is connected to the second terminal for detecting whether or not a voltage is supplied from the external DC voltage supply. A control logic circuit is connected to the first, second and third comparators so as to bring the MOS transistor into an OFF condition when no voltage is supplied from the external DC voltage supply and the secondary cell is in the overdischarged condition, or when the secondary cell is in the overcharged condition.

REFERENCES:
patent: 5073837 (1991-12-01), Baek
patent: 5155428 (1992-10-01), Kang
patent: 5287053 (1994-02-01), Hutchinson
patent: 5304915 (1994-04-01), Sanpei et al.

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