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Energies 2017, 10(10), 1665; https://doi.org/10.3390/en10101665

A Maximum Power Transfer Tracking Method for WPT Systems with Coupling Coefficient Identification Considering Two-Value Problem

College of Automation, Chongqing University, Chongqing 400044, China
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Received: 4 September 2017 / Revised: 4 October 2017 / Accepted: 12 October 2017 / Published: 20 October 2017
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Abstract

Maximum power transfer tracking (MPTT) is meant to track the maximum power point during the system operation of wireless power transfer (WPT) systems. Traditionally, MPTT is achieved by impedance matching at the secondary side when the load resistance is varied. However, due to a loosely coupling characteristic, the variation of coupling coefficient will certainly affect the performance of impedance matching, therefore MPTT will fail accordingly. This paper presents an identification method of coupling coefficient for MPTT in WPT systems. Especially, the two-value issue during the identification is considered. The identification approach is easy to implement because it does not require additional circuit. Furthermore, MPTT is easy to realize because only two easily measured DC parameters are needed. The detailed identification procedure corresponding to the two-value issue and the maximum power transfer tracking process are presented, and both the simulation analysis and experimental results verified the identification method and MPTT. View Full-Text
Keywords: maximum power transfer tracking (MPTT); wireless power transfer (WPT); coupling coefficient; identification; impedance matching maximum power transfer tracking (MPTT); wireless power transfer (WPT); coupling coefficient; identification; impedance matching
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Dai, X.; Li, X.; Li, Y.; Deng, P.; Tang, C. A Maximum Power Transfer Tracking Method for WPT Systems with Coupling Coefficient Identification Considering Two-Value Problem. Energies 2017, 10, 1665.

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