Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 36, Issue 8, Pages 8835-8848Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3055963
Keywords
Rectifiers; Zero voltage switching; Inverters; Switches; Impedance; Control systems; Voltage control; Mode switching; optimal load impedance; wireless power transfer (WPT); zero-voltage switching (ZVS)
Categories
Funding
- National Natural Science Foundation of China [51977175]
- China Postdoctoral Science Foundation [2020TQ0237]
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A dual-sided control strategy based on mode switching is proposed to approach an optimal load impedance and achieve the required output in this article. The control strategy adjusts the output voltage of the inverter by switching the operation mode of the inverter in a wide range to approach the optimal load impedance. Additionally, a novel phase-locked method is proposed for the semi-bridgeless active rectifier control, which is simpler compared with traditional methods.
Transfer efficiency of a wireless power transfer (WPT) system is tightly related to the load, which varies greatly in a wide range during the charging process. Generally speaking, dual-sided control strategies are commonly applied to overcome the load variation and improve system efficiency. However, the system may suffer from hard switching, high control complexity, and auxiliary dc/dc converters. In this article, a dual-sided control strategy based on mode switching is proposed to approach an optimal load impedance, zero-voltage switching of all mosfets in WPT system, and a required output. In this control strategy, the output voltage of the inverter is adjusted in a wide range by switching the operation mode of the inverter to approach the optimal load impedance. The output current/voltage is regulated by the active rectifier control. Besides, a novel phase-locked method is proposed for the semi-bridgeless active rectifier control, which is simpler compared with the traditional phase-locked method. Finally, a 500-W prototype is built to verify the theoretical analysis, and the peak system efficiency of 93.9% is gained with k = 0.23.
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