Charge and discharge control circuit having low voltage detectin

Details Charge and discharge control circuit having low voltage detectin Charge and discharge control circuit having low voltage detectin

1998-02-03

1999-09-28

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

320136, H01M 1046

Patent

active

059594365

ABSTRACT:
A charge/discharge control circuit cuts off a current path to stop charging of an abnormal secondary cell when the voltage of the secondary cell is less than the threshold voltage of a MOS transistor. The charge/discharge control circuit includes a charge and discharge control circuit for monitoring the voltage of a secondary cell and outputting a signal for controlling the charging and discharging of the secondary cell, a switch circuit for receiving the output signal of the charge and discharge control circuit to stop the charging of the secondary cell in an overcharged or overdischarged state, and a low voltage detecting circuit for receiving the output signal of the charge and discharge control circuit, detecting whether the voltage of the secondary cell is below a predetermined voltage, which is below the overdischarge voltage and which is equal to the threshold voltage of a MOS transistor, and for controlling the switch circuit to prevent charging of the secondary cell if the voltage thereof is below the predetermined voltage.

REFERENCES:
patent: 5502629 (1996-03-01), Ito et al.
patent: 5547775 (1996-08-01), Eguchi et al.
patent: 5554919 (1996-09-01), Uchida
patent: 5783998 (1998-07-01), Nakajou et al.

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