期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 62, 期 5, 页码 2807-2813出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2014.2365751
关键词
Capacitive impedance matching; cross coupling; loosely coupled coils; multiple devices; wireless power transfer (WPT)
资金
- Primary Research Program of the Korea Electrotechnology Research Institute - Ministry of Science, ICT and Future Planning [14-12-N0101-08]
- National Research Council of Science & Technology (NST), Republic of Korea [14-12-N0101-08] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This paper presents wireless power transfer (WPT) characteristics according to load variation in multi-device WPT systems using capacitive impedance matching networks (IMNs). Two basis IMNs of using series-parallel (SP) capacitors and parallel-series (PS) capacitors are used. Four combinations of capacitive IMNs are considered, i.e., SP in a transmitting side and SP in a receiving (Rx) side (SP-SP), SP-PS, PS-SP, and PS-PS. The optimum capacitance values for each IMN are also derived by circuit analysis. For verification, three cases based on the number of Rx coils are considered, and the calculated results are compared with the simulated and measured results for each case. A WPT system for only a single device has identical power transfer efficiency for four combinations of the IMNs. Multidevice WPT systems with the PS IMN in Rx sides are found to transfer more power toward the Rx coil with lower load impedance according to the load variation. On the other hand, using the SP IMN in Rx sides is less sensitive to load variation than using the PS IMN. In addition, a WPT system using the PS-PS IMN combination is less responsive to the cross coupling between Rx coils than that using the SP-SP IMN combination.
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