Power supply apparatus for efficient power conservation of a bat

Details Power supply apparatus for efficient power conservation of a bat Power supply apparatus for efficient power conservation of a bat

1993-04-20

1996-06-18

Wong, Peter S.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

323224, 320 23, H02M 700

Patent

active

055280870

ABSTRACT:
A power supply apparatus suitable for a hand-held terminal or the like. In response to a power supply switch turning on, a voltage of a battery is supplied to a boosting voltage circuit and maintained through a diode at a charge capacitor and then applied to a memory, thereby allowing the hand-held terminal to operate normally. While the power supply switch is turned off, the supply voltage stored in the capacitor and applied to the memory is compared with a reference voltage in a comparator. When the supply voltage is lower than the reference voltage, the comparator outputs a signal to a control circuit couple the battery to the boosting circuit for a predetermined time so as to re-charge the capacitor and therefore guarantee back-up of the memory. This arrangement allows the use of the hand-held terminal for a longer time than is normally achieved concurrently with a normal operation of the hand-held device.

REFERENCES:
patent: 4816862 (1988-03-01), Taniguchi et al.
patent: 4845419 (1989-07-01), Hacker
patent: 5021679 (1991-06-01), Fairbanks et al.
patent: 5151645 (1992-09-01), Murata
patent: 5304916 (1994-04-01), Le et al.

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