Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 32, Issue 5, Pages 3297-3300Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2017.2651155
Keywords
Equivalent circuit model (ECM); relay; stability; wireless power transfer (WPT)
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Funding
- Institute for Information and Communications Technology Promotion grant - Korea government (Ministry of Science, ICT and Future Planning) [R7117-16-0146]
- Institute for Information & Communication Technology Planning & Evaluation (IITP), Republic of Korea [R7117-16-0146, 2016-0-00114-002] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We investigate the stability of the transmission efficiency (TE) in nonradiative wireless power transfer (WPT) using a relay resonator. An equivalent circuit model is used to show mathematically that two suppositions are satisfied in an overcoupled region: first, the TE of relay-based WPT systems is always larger than that of conventional two-coil-basedWPT systems, and second, as the coupling coefficient increases, the TE of two-coil-basedWPT systems decreases severely, while the TE of relay-based WPT systems increases slightly. Consequently, we surmise that an intermediate relay can be used to achieve higher TE and stability, compared with conventional two-coil-based WPT systems. We verify that our analytical results are in good agreement with the experimental ones.
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