Current-to-voltage transition control of a battery charger

Details Current-to-voltage transition control of a battery charger Current-to-voltage transition control of a battery charger

2000-04-17

2000-12-26

Riley, Shawn

Electricity: battery or capacitor charging or discharging

Diverse charging or discharging rates for plural batteries

320161, 320162, H02J 700, H02J 714

Patent

active

061665215

ABSTRACT:
A control circuit is provided to minimize the charging cycle time of a battery charging system by maximizing the length of time that high constant charging current is applied to a discharged battery. The control circuit includes a constant current (CC) error amplifier, a constant voltage (CV) error amplifier, an output amplifier, and two pole-splitting compensation networks. The control circuit works in conjunction with a power source to charge a secondary battery. The pole-splitting compensation networks allow the CC, CV, and output amplifiers to be configured for high gain, without sacrificing output stability. The control circuit provides a sharp transition between the CC mode and CV mode of operation. In the CC mode, fast bulk battery charging is provided. In the CV mode, the control circuit initially provides a "top-off" charge to the battery and subsequently safely maintains the battery at its fully charged state. By using bi-directional transconductance error amplifiers as the CC and CV error amplifiers, the control circuit can be optimized for pole-splitting compensation. The control circuit can be operated with a constant internal reference voltage or a variable internal reference voltage. When a variable internal reference voltage is applied, the charging cycle time of the control circuit is further minimized through a charge current compensation technique.

REFERENCES:
patent: 5923150 (1999-07-01), Umetsu
patent: 6028415 (2000-02-01), Nagai et al.
patent: 6087810 (2000-07-01), Yoshida

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