Electronic equipment having automatic power-off function

Details Electronic equipment having automatic power-off function Electronic equipment having automatic power-off function

1992-03-23

1993-07-20

Stephan, Steven L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 11, 307 66, H02J 710, H02J 734

Patent

active

052297063

ABSTRACT:
Electronic equipment, such as a word processor or personal computer, is capable of preventing a battery from being overcharged. When no information is entered to the equipment via keys for a specified period of time, such as ten minutes or longer, in a state in which an AC adaptor is electrically connected to an adaptor connecting terminal, a transistor TR1 is turned on to start the charging of the battery. The battery is continuously charged until another period of time, such as six hours, elapses from the time of the initiation of its charging. When six hours have elapsed, the transistor TR1 is turned off to stop the supply of a charging current to the battery. As a result, the battery has been fully charged and a switching device is turned off, whereby the supply of electric power to a control unit and a load is stopped.

REFERENCES:
patent: 4670703 (1987-06-01), Williams
patent: 4709202 (1987-11-01), Koenck et al.
patent: 4737702 (1988-04-01), Koenck

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