Power supply unit and an electronic apparatus having same

Details Power supply unit and an electronic apparatus having same Power supply unit and an electronic apparatus having same

1997-09-10

1998-10-06

Tso, Edward

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

H01M 1046

Patent

active

058182039

ABSTRACT:
Disclosed is an electronic apparatus which includes a power supply unit and a constant voltage rechargeable battery. The power supply unit activates a dedicated charging circuit, which is located near the battery, only at the charging end stage after the terminal voltage of the battery has attained a predetermined value, and provides constant voltage control for a charge current by using the charging circuit. The charging circuit, however, is not employed at the initial charging stage, where precise constant voltage control is not required. The output current, for which constant current control is performed by the AC adaptor, is employed unchanged as a charge current, with which quick charging is performed. That is, since a transformer in the charging circuit is not activated at the initial charging stage, a power loss, which accompanies the operation of the transformer, and heat generation and the occurrence of magnetic noise in the electronic apparatus can be reduced to a minimum.

REFERENCES:
patent: 5028860 (1991-07-01), Amano
patent: 5541490 (1996-07-01), Sengupta et al.
patent: 5557738 (1996-09-01), Townsley et al.
patent: 5563493 (1996-10-01), Matsuda et al.
patent: 5572110 (1996-11-01), Dunstan
patent: 5583417 (1996-12-01), Yuen
patent: 5721481 (1998-02-01), Narita et al.

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