A High-Efficiency Multimode Li–Ion Battery Charger With Variable Current Source and Controlling Previous-Stage Supply Voltage
Jiann-Jong Chen
Fong-Cheng Yang
Chien-Chih Lai
Yuh-Shyan Hwang
Ren-Guey Lee
Dept. of Electron. Eng., Nat. Taipei Univ. of Technol., Taipei;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: July 2009
Volume: 56,
Issue: 7
On page(s): 2469-2478
ISSN: 0278-0046
INSPEC Accession Number: 10736231
Digital Object Identifier: 10.1109/TIE.2009.2018435
First Published: 2009-04-07
Current Version Published: 2009-06-30
Abstract
A high-efficiency multimode Li-ion battery charger with variable current source and controlling previous-stage supply voltage is presented in this paper. Using variable current source can achieve the goal of constant-current mode to charge the battery and control previous-stage supply voltage which could increase the efficiency of the multimode battery charger. Moreover, the charging mode adopted in this charger is applied by two types of dual-mode strategy decided by the value of the equivalent series resistance of the Li-ion battery. This technique will reduce the damage of Li-ion battery. The Li-ion battery charger is designed with 0.35-mum CMOS double-poly four-metal processes. The experimental results show that the charger works well and the theoretical analysis can be confirmed. The average power efficiency of the multimode Li-Ion battery charger can be up to 91.2% under the average power of 1.24 W, and the accuracy of the adaptive reference voltage is up to 97.3%. The chip area is only 1.32 times 0.95 mm2.
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