{"title":"High Efficiency Three-Coil Wireless Power Transfer for EV Battery Charging Through Negative-Polarity Partial Power Conversion","authors":"Muxing Wu;Io-Wa Iam;Chi-Seng Lam","doi":"10.1109/TPEL.2025.3538756","DOIUrl":null,"url":null,"abstract":"As electric vehicles (EVs) become increasingly prevalent, the need for efficient wireless charging solutions grows more pressing. Herein, an innovative wireless charging system is proposed for EVs that achieves high efficiency through a negative-polarity partial power conversion (NP-PPC) approach. While conventional PPC methods are constrained by series-connected relationships, our proposed NP-PPC approach inverts the voltage polarity of the dc/dc regulation converter that enables a redesign of power flow paths. This breakthrough allows a significantly larger portion of power to be unregulated, thus substantially improving the overall system efficiency. Moreover, the system implements a novel three-coil loosely-coupled transformer structure that creates two noninterfering power paths that can eliminate the complexity of conventional coil designs. On this basis, a synchronous checking and mode-switching control strategy achieves both constant current and constant voltage charging without wireless communication. Finally, experimental results from a 1200 W prototype demonstrate the system's effectiveness, achieving a peak efficiency of 94.156%.","PeriodicalId":13267,"journal":{"name":"IEEE Transactions on Power Electronics","volume":"40 6","pages":"8834-8846"},"PeriodicalIF":6.5000,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Power Electronics","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/10870404/","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
As electric vehicles (EVs) become increasingly prevalent, the need for efficient wireless charging solutions grows more pressing. Herein, an innovative wireless charging system is proposed for EVs that achieves high efficiency through a negative-polarity partial power conversion (NP-PPC) approach. While conventional PPC methods are constrained by series-connected relationships, our proposed NP-PPC approach inverts the voltage polarity of the dc/dc regulation converter that enables a redesign of power flow paths. This breakthrough allows a significantly larger portion of power to be unregulated, thus substantially improving the overall system efficiency. Moreover, the system implements a novel three-coil loosely-coupled transformer structure that creates two noninterfering power paths that can eliminate the complexity of conventional coil designs. On this basis, a synchronous checking and mode-switching control strategy achieves both constant current and constant voltage charging without wireless communication. Finally, experimental results from a 1200 W prototype demonstrate the system's effectiveness, achieving a peak efficiency of 94.156%.
期刊介绍：
The IEEE Transactions on Power Electronics journal covers all issues of widespread or generic interest to engineers who work in the field of power electronics. The Journal editors will enforce standards and a review policy equivalent to the IEEE Transactions, and only papers of high technical quality will be accepted. Papers which treat new and novel device, circuit or system issues which are of generic interest to power electronics engineers are published. Papers which are not within the scope of this Journal will be forwarded to the appropriate IEEE Journal or Transactions editors. Examples of papers which would be more appropriately published in other Journals or Transactions include: 1) Papers describing semiconductor or electron device physics. These papers would be more appropriate for the IEEE Transactions on Electron Devices. 2) Papers describing applications in specific areas: e.g., industry, instrumentation, utility power systems, aerospace, industrial electronics, etc. These papers would be more appropriate for the Transactions of the Society which is concerned with these applications. 3) Papers describing magnetic materials and magnetic device physics. These papers would be more appropriate for the IEEE Transactions on Magnetics. 4) Papers on machine theory. These papers would be more appropriate for the IEEE Transactions on Power Systems. While original papers of significant technical content will comprise the major portion of the Journal, tutorial papers and papers of historical value are also reviewed for publication.
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