Fast-charging device for rechargeable batteries

Details Fast-charging device for rechargeable batteries Fast-charging device for rechargeable batteries

1996-04-24

1998-02-10

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 21, 320 23, 320 27, 320 32, H02J 704, H01M 1046

Patent

active

057173117

ABSTRACT:
A battery charging device for providing a fast charging a rechargeable battery and controlling the charging process to prevent overcharging. The battery charging device detects a decrease in the voltage of the rechargeable battery as it is being charged and approaches a full charge, and modulates the switching of a switching power supply supplying current to the rechargeable battery in response thereto. The battery charging device has a first resistor in series with the rechargeable battery which is to be charged, a power supply which charges the rechargeable battery, a charging control unit which detects a decrease in the voltage across the rechargeable battery using capacitors and which outputs battery condition signals and battery error signals in response thereto, and a power supply control unit which accepts a mode change signal and a battery error signal from the charging control unit and outputs a control signals for controlling the power supply.

REFERENCES:
patent: 5477125 (1995-12-01), Ettel et al .
patent: 5541490 (1996-07-01), Sengupta et al.

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