Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 35, Issue 7, Pages 7123-7133Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2019.2954078
Keywords
Class-E converter; soft switching; voltage stress; wireless power transfer
Categories
Funding
- Fujian Province Outstanding Youth Fund [2018J06016]
- Natural Science Foundation of China [61671400]
- Xiamen University Nanqiang Young Top Talents Program
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The class-E converter with soft-switching has been widely used in high-frequency wireless power transfer (WPT) system. However, the high voltage stress on the switch limits its application. In this article, a compound voltage-clamped class-E converter, consisting of an auxiliary clamped circuit and class-E converter, is proposed in the WPT system to solve the issue. Through impedance analysis, SP (series-parallel) resonance network is employed for the proposed converter to reach high transfer efficiency. Meanwhile, based on the analysis of voltage stress on the switches and the boundary condition for zero-voltage-switch (ZVS) operation, the optimal operation region could be obtained, leading to a reduced voltage stress and switching loss together. Moreover, as the conduction duty-cycle becomes a controllable freedom in the proposed converter, the relationship between conduction duty cycle and output power is given out, which makes power transfer more flexible while maintaining ZVS operation synchronously. Finally, a prototype was built to verify the performance of the proposed topology, and the experiments agreed well with the calculation.
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