Accurate Design of Very-High-Frequency Resonant Converter Based on Gradient Descent and Considering Multiple Harmonics

Abstract

Due to the inherent strong coupling and nonlinearity in typical very-high-frequency (VHF, 30–300 MHz) resonant converters, conventional design methods face challenges in considering multiple harmonics and identifying their complex coupling relationships, which limits the design accuracy of resonant parameters. In order to solve this issue, this article presents a new design method, which involves considering multiple harmonics for the separate design of the inverter and rectifier stages and identify their coupling relationships by using the gradient descent algorithm. The simulation result shows that the output power, particularly the soft-switching feature are very consistent with the design requirement. Compared to the conventional design methods, the proposed one in theoretical design has higher accuracy and reduces dependence on simulation tools, which helps to guide the further consideration of parasitic parameters in practical design and develop it into a computer program for easier application. Finally, the feasibility and effectiveness of the proposed method are experimentally verified by a 30 MHz prototype with a rated input power of 20W.