A Frequency Regulation Strategy for Dynamic Process Noise Suppression in LCC-S WPT Systems

Abstract

This article proposed a frequency regulation strategy (FRS) to realize zero voltage switching (ZVS) in the dynamic process of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC</i> -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- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> 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 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC</i> -S WPT system, and the experimental results show that the FRS can reduce electromagnetic interference by 13 dB in one dynamic starting-up cycle.