Battery charging and discharging control circuit which charges a

Details Battery charging and discharging control circuit which charges a Battery charging and discharging control circuit which charges a

1998-09-29

2000-02-29

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With individual charging of plural batteries or cells

H01M 1046

Patent

active

060313560

ABSTRACT:
An electronic device including an internal battery and an expansion battery can not be operated when the charge in both batteries is drained. Accordingly, when charging the batteries, a control circuit, after confirming that the internal battery is not fully charged, sets an FET to a conductive state and an FET to a non-conductive state. The result is that charging occurs from the internal battery provided the internal battery is not fully charged. After the internal battery is fully charged, the control circuit sets the FET to a non-conductive state and the FET to a conductive state so that this time the expansion battery is charged. Thus, if a short operating time is sufficient, the internal battery can be rapidly charged so that the electronic equipment can be operated by itself after charging for only a short period.

REFERENCES:
patent: 3928791 (1975-12-01), Mullersman
patent: 4851756 (1989-07-01), Schaller et al.
patent: 5122722 (1992-06-01), Goedken et al.
patent: 5818200 (1998-10-01), Cummings et al.
patent: 5867007 (1999-02-01), Kim

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