Power supply device having low internal power consumption and el

Details Power supply device having low internal power consumption and el Power supply device having low internal power consumption and el

1995-08-04

1999-02-16

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

320107, 320DIG12, 320163, H02J 700, H02J 704

Patent

active

058724451

ABSTRACT:
A power supply device includes a secondary battery and a charger, and can further utilize an external D.C. power supply. A switch is interposed between a negative electrode of the secondary battery and the ground. This switch is turned OFF when the external D.C. power supply is connected to the power supply device, and is turned ON when the external D.C. power supply is removed from the power supply device. The charger controls the charge of the secondary battery from the external D.C. power supply by regulating the potential of the negative electrode of the battery. A contact remains OFF while the external D.C. power supply is connected to the power supply device. In consequence, a current does not directly flow from the external D.C. power supply to the secondary battery. Therefore, a back-flow prevention diode, which otherwise results in power consumption, need not be disposed between the secondary battery and the load.

REFERENCES:
patent: 5150031 (1992-09-01), James et al.
patent: 5150032 (1992-09-01), Ho
patent: 5185565 (1993-02-01), Uchida
patent: 5317249 (1994-05-01), Ford
patent: 5493197 (1996-02-01), Eguchi et al.
patent: 5504411 (1996-04-01), McCaleb et al.

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