A Short-Current Control Method for Constant Frequency Current-Fed Wireless Power Transfer Systems

Yanling Li, Qichang Duan and Weiyi Li
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Yanling Li: School of Automation, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing 400030, China
Qichang Duan: School of Automation, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing 400030, China
Weiyi Li: School of Automation, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing 400030, China

Energies, 2017, vol. 10, issue 5, 1-21

Abstract: Frequency drift is a serious problem in Current-Fed Wireless Power Transfer (WPT) systems. When the operating frequency is drifting from the inherent Zero Voltage Switching (ZVS) frequency of resonant network, large short currents will appear and damage the switches. In this paper, an inductance-dampening method is proposed to inhibit short currents and achieve constant-frequency operation. By adding a small auxiliary series inductance in the primary resonant network, short currents are greatly attenuated to a safe level. The operation principle and steady-state analysis of the system are provided. An overlapping time self-regulating circuit is designed to guarantee ZVS running. The range of auxiliary inductances is discussed and its critical value is calculated exactly. The design methodology is described and a design example is presented. Finally, a prototype is built and the experimental results verify the proposed method.

Keywords: frequency drift; current-fed; wireless power transfer; short current; inductance damping (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: 2017
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