Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 29, Issue 3, Pages 1058-1063Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2013.2277783
Keywords
Decreasing frequency; magnetic resonance; quality factor; transfer efficiency; wireless power transfer
Categories
Funding
- National High Technology Research and Development Program of China under 863 Program [2011AA050402]
- State Key Laboratory of Power System in Tsinghua University [SKLD11M03]
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Recent years have witnessed the booming development of resonant wireless power transfer (RWPT). Compared with conventional inductive power transfer, the frequency of RWPT is usually much higher. To reduce the resonant frequency while maintaining the transfer efficiency constant at the same transfer distances, two solutions are proposed and realized in this letter. Two fundamental structures for RWPT are analyzed and the expressions of the transfer efficiency are deduced. It is pointed out that the transfer quality factor and the load matching factor are two important factors of achieving high transfer efficiency. The larger the transfer quality factor, the higher the transfer efficiency. There is an optimal load matching factor to reach the highest transfer efficiency. The transfer efficiency can remain constant at the same distances if the transfer quality factor is kept at the same level and the load is matched. Theoretical calculations and experimental results provide a sound basis for decreasing frequency.
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