Abstract Due to the limitation of the operating frequency of switching devices, the output frequency converted by conventional high-frequency inverters is difficult to increase.In order to meet the requirements of high-frequency operation of wireless power transfer (WPT) systems, an inverter and its driving strategy, whose output square wave frequency is three times the operating frequency of the switching device, are proposed based on conventional phase-shifting full-bridge inverters in this paper.The operating modes of the proposed inverter withan equivalent WPT model are also analyzed. Compared with other high-frequency inverters, the output frequency of the inverter is increased by three times, the current stress of the switches is reduced to one third of the original, and the heat loss of the switches is also decreased, and it has the potential to output higher frequency. Meanwhile, soft switching is realized to ensure the high efficiency of the inverter, and asimple and mature phase-shifting or variable-frequency control scheme can be adopted to adjust the output power. Finally, a WPT experimental prototypebased on the triple-frequency inverter is built to verify the correctness and feasibility of the theoretical analysis and design of the triple-frequency inverter.
Zhao Jiansong,Wang Junhua,Cai Changsong等. Triple Frequency Inverter Based on Time-Sharing Composite for Wireless Power Transfer System[J]. Transactions of China Electrotechnical Society, 2022, 37(21): 5513-5525.
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2022, Vol. 37 
