A battery charger with maximum power point
tracking function for low-power photovoltaic system applications



Huang-Jen Chiu1, Yu-Kang Lo1, Ting-Peng Lee1, Qing Su Chen1, Wen Long Yu1,
Jian-Xing Lee1, Frank Shih2 and Shann-Chyi Mou3
1Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
2Macroblock, Inc., Taiwan
3Department of Mechanical Engineering, Ching-Yun University, Taipei, Taiwan

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ABSTRACT
A battery charger with MPPT function for low-power PV system applications is presented in this study. For effective
miniaturization, the battery charger is designed with high-frequency operation. Some current-sensing techniques are studied,
and theirMPPT implementation is compared. A battery charging method is also designed to prolong battery lifetimewithout
the use of battery current sensors. The operation principles and design considerations of the proposed PV charger are
analyzed and discussed in detail. A laboratory prototype is implemented and tested to verify the feasibility of the proposed
scheme. Experimental results show that high MPPT accuracy and conversion efficiency can be simultaneously achieved
under high-frequency operation


http://ieeexplore.ieeeiel5/5374437/53856...er=5385709