Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 11, Pages 13978-13988Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3187459
Keywords
Zero voltage switching; Switches; Inverters; Electromagnetic interference; Voltage control; Control systems; Voltage; Dynamic process; frequency regulation strategy (FRS); switching noise; wireless power transfer (WPT); zero voltage switching (ZVS)
Categories
Funding
- National Natural Science Foundation of China [52007012]
- Fundamental Research Funds for the Central Universities [2020CDJYGZDH005]
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This article proposes a frequency regulation strategy (FRS) to achieve zero voltage switching (ZVS) in LCC-S wireless power transfer systems, aiming to suppress switching noise during system startup. By detecting the magnitude and direction of the inverter's output current, a delayed turn-on signal is applied to ensure ZVS under various operating conditions. Experimental results validate the effectiveness of the proposed control strategy.
This article proposed a frequency regulation strategy (FRS) to realize zero voltage switching (ZVS) in the dynamic process of LCC-S wireless power transfer systems, which aims at suppressing serious switching noise in the starting-up phase of the inverter. By detecting the magnitude and direction of the output current of the inverter, a delayed turn-on signal is timely applied to ensure that the inverter can achieve ZVS in all operating conditions. The origins of the mechanism of switching noise are presented, and the closed-loop stability of the system under the proposed control strategy is analyzed. The correctness of the theoretical analysis and the effectiveness of the control strategy is verified by both simulation and experiment results. This control strategy is technically effective for all resonant converters in the switching noise suppression. Finally, the method is verified in a 1.5 kW, 85 kHz, 310V LCC-S WPT system, and the experimental results show that the FRS can reduce electromagnetic interference by 13 dB in one dynamic starting-up cycle.
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