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PANG Haiping,QIU Yi,CHEN Haoran.Maximum Efficiency Tracking of WPT System Based on Optimal Load Matching[J].JOURNAL OF POWER SUPPLY,2021,19(2):153-159
Maximum Efficiency Tracking of WPT System Based on Optimal Load Matching
Received:February 26, 2019  Revised:February 05, 2021
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DOI:10.13234/j.issn.2095-2805.2021.2.153
Keywords:magnetically-coupled resonant (MCR)  wireless power transmission (WPT)  optimal load  efficiency tra-cking  phaselocked loop tuning
Fund Project:Supported by Shandong Provincial Natural Science Foundation, China (ZR2018LF008);Shandong province undergraduate university teaching reform research project (ZR2018LF008) ; National College Students' innovation and entrepreneurship training program (201610426041)
        
AuthorInstitutionEmail
PANG Haiping College of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao , China panghp123@163.com
QIU Yi College of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao , China
CHEN Haoran College of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao , China
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Abstract:
      Owing to its advantage of transferring relatively larger power over medium and long distances, magnetically-coupled resonant wireless power transmission (MCR-WPT) has high potential application value. In this paper, the transmis-sion efficiency of a type of MCR-WPT system with series-series equivalent circuit is analyzed, and it is concluded that both of the transmitting and receiving circuits being in resonance state at the same frequency simultaneously is only a necessary condition to achieve the system's maximum efficiency. Through further analysis, it is proved that under the condition of a given coil mutual inductance, there exists an optimal load that can make the system's transmission efficiency reach its maximum possible value. Afterwards, a DC-DC impedance conversion circuit is introduced to make the system obtain equ-ivalent optimal load under any actual load, and a maximum efficiency tracking scheme with resonance frequency tracking by phase-locked loop is proposed and designed, which is based on optimal impedance matching. Finally, the effectiveness and feasibility of the proposed scheme were verified by simulation and experimental results.
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