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Energies 2017, 10(5), 585; doi:10.3390/en10050585

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

School of Automation, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing 400030, China
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Academic Editor: Aiguo Patrick Hu
Received: 24 February 2017 / Revised: 15 April 2017 / Accepted: 20 April 2017 / Published: 25 April 2017
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)

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. View Full-Text
Keywords: frequency drift; current-fed; wireless power transfer; short current; inductance damping frequency drift; current-fed; wireless power transfer; short current; inductance damping
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, Y.; Duan, Q.; Li, W. A Short-Current Control Method for Constant Frequency Current-Fed Wireless Power Transfer Systems. Energies 2017, 10, 585.

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