Accurate, compact, and power-efficient Li-ion battery charger circuit

被引:120
作者
Chen, Min [1 ]
Rincon-Mora, Gabriel A.
机构
[1] Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA
[2] Georgia Tech Res Inst, Analog & Power IC Design Lab, Atlanta, GA 30332 USA
关键词
adaptive power supply; constant current (CC) charger; constant voltage (CV) charger; lithium-ion (Li-ion) battery; linear charger; switching charger;
D O I
10.1109/TCSII.2006.883220
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A novel, accurate, compact, and power-efficient lithium-ion (Li-Ion) battery charger designed to yield maximum capacity, cycle life, and therefore runtime is presented and experimentally verified. The proposed charger uses a diode to, smoothly (i.e., continuously) -transition between two high-gain linear feedback loops and control a single power MOS device, automatically charging the battery with constant current and then constant voltage. An adaptive power-efficient charging scheme in the form of a cascaded switching regulator supply ensures the voltage across the charging power-intensive pMOS remains low, thereby reducing its power losses and yielding up to 27% better overall power efficiency. An 83% power-efficient printed circuit board prototype was built and used to charge several Li-lon batteries to within 0.43% of their optimum full-charge voltage and therefore within a negligibly small fraction of their full capacity.
引用
收藏
页码:1180 / 1184
页数:5
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