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Comparative study on power conversion methods for wireless battery charging platform

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4 Author(s)
W. P. Choi ; Convenientpower HK Ltd., Hong Kong, China ; W. C. Ho ; X. Liu ; S. Y. R. Hui

In this paper, four different power conversion methods (voltage control, duty-cycle control, frequency control and phase-shift control) are compared for wireless power transfer applications by considering the energy transfer efficiency, electromagnetic interference, stability, and implementation complexity. The phase-shift control is found to be the optimal scheme with good efficiency and low electromagnetic interference. Its constant frequency feature is also within the framework of the new international wireless charging standard called `Qi'. A high system efficiency of 72% for 5W wireless charging applications has been achieved practically.

Published in:

Power Electronics and Motion Control Conference (EPE/PEMC), 2010 14th International

Date of Conference:

6-8 Sept. 2010