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.
Highlights
Wireless power transfer (WPT) has made a great development in the past few decades
Since the load resistance of a practical WPT system varies with time, using DC/DC converters to do the impedance matching is more suitable for the frequent load variations [19]
2, systemare parameters the simulation analysis are shown in Section 3, experimental verification of the proposed coupling coefficient identification and the maximum power transfer tracking (MPTT) are shown in Section 4, 2
Summary
Wireless power transfer (WPT) has made a great development in the past few decades. It has been used in many occasions without the direct electrical contact (e.g., smart phone charging, implantable device charging, and electric vehicle (EV) charging, etc.) [1,2,3,4,5,6,7,8]. One thing about the impedance matching using DC/DC converters is that it cannot be realized when unknowing the parameters, such as coupling coefficient and load resistance [22,23]. Reference [14] presents a coupling coefficient and load identification method, with two equations derived by switching the compensation capacitors, the two variables can be calculated. Reference [24] studies the identification mutual of coupling coefficient, and it need to measure the parameters on the secondary side. As long as to theimplement coupling coefficient and load arethe determined, the Theidentification method does process not require any other circuit the identification and identification maximum power transfer tracking is realized by impedance matching. Issue during follows: system topology, identification, MPTT description is presented in the identification process coupling is solved.coefficient. 2, systemare parameters the simulation analysis are shown in Section 3, experimental verification of the proposed coupling coefficient identification and the MPTT are shown in Section 4, Coupling
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