A METHOD OF TRACKING OPTIMUM EFFICIENCY FOR FOUR-COIL WIRELESS POWER TRANSFER SYSTEM | Zendy

Zhongqi Li | Zendy; Yixiong Lai | Zendy; Jiliang Yi | Zendy; Junjun Li | Zendy

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A METHOD OF TRACKING OPTIMUM EFFICIENCY FOR FOUR-COIL WIRELESS POWER TRANSFER SYSTEM

Author(s) -

Zhongqi Li,

Yixiong Lai,

Jiliang Yi,

Junjun Li

Publication year - 2017

Publication title -

progress in electromagnetics research b

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.208

H-Index - 47

ISSN - 1937-6472

DOI - 10.2528/pierb17040303

Subject(s) - wireless power transfer , electromagnetic coil , tracking (education) , computer science , power (physics) , transfer (computing) , wireless , control theory (sociology) , electrical engineering , telecommunications , physics , artificial intelligence , control (management) , engineering , thermodynamics , psychology , pedagogy , parallel computing

Magnetic resonant wireless power transfer (WPT) is an emerging technology that may create new applications for wireless power charging. However, low efficiency resulting from the change of the transfer distance is a main obstructing factor for promoting this technology. In this paper, a method of fast tracking optimum efficiency is proposed. The input impedance value is obtained by measuring the input current. Then the transfer distance is estimated by the input impedance value. The optimum load resistor is obtained under a given transfer distance. In addition, the extended Lmatching network is proposed in order to automatically adjust the load resistor. The key parameters of the matching network are also given. The optimum efficiency can be fast tracked by the proposed method as the transfer distance varies. The WPT system and the extended L-matching network are designed. Simulated and experimental results validating the proposed method are given.

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