Impedance Matching Method for 6.78 MHz Class-E2-Based WPT System

Yi Zhang, Yue Feng, Sheng Liu, Jiande Wu and Xiangning He
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Yi Zhang: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Yue Feng: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Sheng Liu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Jiande Wu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Xiangning He: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Energies, 2021, vol. 14, issue 14, 1-15

Abstract: The performance of a conventional Class-E2-based WPT system is sensitive to system parameters such as the coil coupling coefficient and load variation. System efficiency decreases rapidly when the coil coupling coefficient and load deviate from their optimum values. In this paper, an impedance matching method and a design procedure are proposed to maintain high system efficiency over a wider range of coupling coefficient and load variations. The load-pull technique is adopted to identify the high-efficiency load region of a Class-E power amplifier (PA), and a double-L-type impedance matching network (IMN) is proposed to transform the load impedance of a Class-E PA into a high-efficiency working region. Compared to a single L-type IMN, a double-L-type IMN is more flexible and has better tuning performance. A 6.78 MHz Class-E2-based WPT system was built to validate the proposed design method. The experimental results show that the proposed double-L-type IMN can significantly attenuate the decline in Class-E PA efficiency when system parameters dynamically change. With a double-L-type IMN, the WPT system could maintain high efficiency (over 55%) under a wider range of coil coupling coefficient and load variations. The peak system efficiency reached 83.2% with 13.7 W output power. The impedance matching method and design procedure in this paper could provide a practical solution for building a high-efficiency WPT system with strong robustness.

Keywords: impedance matching method; double-L-type IMN; class-E2-based WPT system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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