期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 69, 期 7, 页码 6870-6880出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3102411
关键词
Rectifiers; Inverters; Zero voltage switching; Voltage control; Reactive power; DC-DC power converters; Optimization; Efficiency; light-load; triple-phase-shift (TPS); wireless power transfer (WPT); zero-voltage-switching (ZVS)
资金
- National Natural Science Foundation of China [51907169]
- Sichuan Science and Technology Program [2020YFH0031]
- Fundamental Research Funds for the Central Universities [2682020CX16]
- Star of Science and Technology in Southwest Jiaotong University [2682021CG018]
This article addresses the issue of high reactive power leading to low efficiency in traditional wireless power transfer systems. A mathematical model is established to reveal how reactive power decreases system efficiency. A hybrid modulation control strategy is proposed and validated through experimental results, showing high efficiencies up to 94.29% in a wide load range.
Traditional wireless power transfer (WPT) systems usually adopt the triple-phase-shift control method to maintain a constant output voltage, track the maximum system efficiency point (MEPT), and achieve zero-voltage-switching (ZVS) operation for various applications. However, these three targets are achieved at the cost of high reactive power on both primary and secondary sides, especially under light-load conditions, leading to low efficiency. This has become one of the challenges that hinder a further deployment of WPT technologies in practice. To address this vital problem, in this article, how the reactive power lowers the system efficiency is revealed based on a mathematical model established. Then, a hybrid modulation control strategy based on a proper selection between the full-bridge and half-bridge modes of the inverter and active rectifier is developed. An experimental prototype is constructed to verify the effectiveness of the proposed control method. Experimental results show that the proposed method can reduce the reactive power, maintain a constant output voltage, and realize the MEPT and ZVS operation, with high efficiencies up to 94.29% in a wide load range.
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