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Title: Compensation topologies in wireless power transfer converters
Authors: Liu, Ying
Degree: Ph.D.
Issue Date: 2021
Abstract: This thesis aims to study second and higher order compensation topologies for wireless power transfer (WPT) covering inductive power transfer (IPT) and capacitive power transfer (CPT) systems, and to provide design guidelines for various types of compensation circuits for addressing the common and inevitable issues arising from wide variations of coupling and compensation parameters. This thesis first presents a unified T-type two-port network model for IPT and CPT converters, contributing to offer direct insights into the choice of appropriate compensation topologies and their relationship with performance. General transfer characteristics and corresponding operating conditions of the presented T-model IPT and CPT converters are summarized. On this basis, all possible second-order compensation topologies are systematically analyzed in depth. A systematic extension of the basic second-order compensated IPT and CPT converters is then presented for achieving load-independent current (LIC) or load-independent voltage (LIV) output, to higher order compensated converters through adding an inductor or capacitor at the input or output side. Conditions on the parameters to achieve the required output performance are given. Then, the system's sensitivity to various parameters' fluctuation is analyzed. Results from sensitivity analysis provide a convenient design guide for selecting parameters and compensation topologies to achieve the required LIV and LIC operation for IPT and CPT systems with fewer design constraints. Moreover, the analysis effectively reveals the roles of extra input-side or output-side inductors and capacitors in making the whole system less sensitive, and hence provides a fast understanding of the choice of various compensation circuits for applications addressing wide ranges of coupling and compensation parameter values. Finally, to highlight the advantages of different compensation topologies for WPT systems, specific configurations of IPT systems for multi-load applications are further developed. Since the versatility of the coupling structure and the choice of parameter values are crucial due to the diversity of load appliance types and operating conditions, the features of four coupling structures, namely single-input single-output (SISO), single-input multiple-output (SIMO), multiple-input single-output (MISO) and multiple-input multiple-output (MIMO), are analyzed in depth, from which general transfer characteristics are obtained. Based on the series-series compensation topology, a set of design principles for IPT circuits satisfying various output requirements in a multi-load environment is presented. Control strategies to address the impedance matching issue are also proposed. Moreover, a third-order compensation scheme is presented to improve the performance of IPT systems with multiple outputs and to facilitate the control process.
Subjects: Wireless power transmission
Electric current converters
Switching circuits
Hong Kong Polytechnic University -- Dissertations
Pages: xxii, 126 pages : color illustrations
Appears in Collections:Thesis

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