Power sharing detector for use with a battery charger and an aux

Details Power sharing detector for use with a battery charger and an aux Power sharing detector for use with a battery charger and an aux

1994-02-03

1996-12-10

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

307 39, H01M 1046

Patent

active

055834175

ABSTRACT:
A technique for detecting power demand to provide efficient power sharing. The technique is particularly but not exclusively concerned with providing a power sharing detector for use in a portable computer which requires battery charging to be done concurrently with computer usage, and preferably provides three different rates of charging. A power sharing detector is provided for use with this technique. The power sharing detector is used in a circuit which has a power supply which supplies power both to an auxiliary device and a battery charger. The detector has a voltage detection circuit which is connected to receive a voltage representative of the power supplied to the auxiliary device and to determine therefrom a state of the auxiliary device. The detector also has means for selecting one of two charging rates for charging a battery in dependence on the voltage detected by the voltage detection circuit whereby a lower charging rate for charging the battery is selected when it is determined that said auxiliary device is in an on state so that the total power required by the auxiliary circuit and the battery charger does not exceed the maximum power which the power supply can provide.

REFERENCES:
patent: 5122722 (1992-06-01), Goedken et al.
patent: 5130634 (1992-07-01), Kasai
patent: 5157269 (1992-10-01), Jordan et al.
patent: 5317249 (1994-05-01), Ford
patent: 5325040 (1994-06-01), Bogut et al.
patent: 5489836 (1996-02-01), Yuen

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