Research on Single-Stage Lithium Battery Charger Featuring High Power Factor and Charge Equalization

• Main Authors: Yu-Hsiang Shen, 沈郁翔
• Other Authors: Yong-Nong Chang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/425b28

碩士 === 國立虎尾科技大學 === 電機工程研究所 === 102 === This thesis proposes an interleaved single-stage high power factor full-bridge resonant circuit as the main electric structure of equalization charger for lithium battery. Besides, from full-bridge resonant structure, by using appropriate trigger signal interleaving control for the design of combined application of two inductors. Not only power factor correction can be achieved, with two complementary storage inductors, power consumptions can be equally shared. This thesis uses multiple transformers combine with equalization switches. LabVIEW digital control coordinates with equalization switches, which performs higher efficiency in energy transfer during equalization. In this thesis, battery packs can be charged independently, the charging switches are also automatically stop transfer energy when the battery packs are fully charged. Leakage inductance is used as resonant component; therefore, the numbers of component can be minimized. In addition, leakage inductance can be adjusted to implement different loading current by change the value of leakage inductance and switching frequency. In this thesis, power switches of resonant circuit achieve Zero-Voltage Switching (ZVS) function, can effetely reduces power losses of equalization charging circuit. Finally, the practical application of equalization charging experiments on Lifepo4 battery pack 48V/2.3AH, the experimental results verification of the charge equalizer attached high power factor, high efficiency and equalizing charging function.