Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 8, Pages 10045-10060Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3159129
Keywords
Damping; RLC circuits; Receivers; Wireless power transfer; Multilevel inverters; Control systems; Topology; Compensation network; multilevel inverter (MLI); multiple power channel; wireless power transfer (WPT)
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Funding
- Science Technology and Innovation Committee of Shenzhen Municipality, Shenzhen, China [JCYJ20180307123918658]
- Innovation and Technology Commission, Hong Kong SAR [ITP/027/19AP]
- Collaboration Research Fund from Research Grants Council, Hong Kong SAR [CRF: C1052-21GF]
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This article presents the design and control methods of a decoupled multichannel wireless power transfer system based on multilevel inverters. The system solves the problems of complex system structure and cross-interference among receivers. By utilizing a single-phase multilevel inverter, the system is able to transmit power to multiple loads simultaneously without mutual interference.
Traditional multichannel wireless power transfer (WPT) systems suffer from the complex system structure and cross-interference among receivers. To solve such problems, this article presents the design and control methods of a decoupled multichannel WPT system based on multilevel inverters. A single-phase multilevel inverter is utilized to drive the transmitter circuit with a voltage waveform consisting of multiple components. Particularly, these components are independent in the frequency spectrum, and their amplitudes can be controlled independently. Moreover, primary compensation is used to offer multiple frequencies for the primary circuit. Additional damping filters are used in the secondary circuits to reduce the cross-interference between the receivers. In addition, the features of the system topology are analyzed, and an exact parameter design method is presented. Furthermore, combined with the neutral point voltage balance strategy, a simple vector-based control method is proposed to regulate the transmitted power in each power channel. As a result, the power can be transferred to loads through the designed power channels simultaneously without mutual interference. Finally, both simulation and experiment of a 1-kW experimental prototype with SIC-MOSFET are given to verify the feasibility of the proposed multichannel WPT system and the control strategy.
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