An integrated controller for high-frequency LCLC resonant inverter with phase-shifted control and frequency regulation

摘要

High-frequency alternating current has an extensive application as a result of outstanding advantages. The aim of the study is to develop a high-frequency power source to feed the auxiliary loads of vehicle application such as electric fans, blower motors, and lighting. A feasible implementation of high-frequency power source is examined by a full-bridge LCLC resonant inverter. The corresponding control scheme is proposed for the fourth-order resonant inverter to confront the control challenges of low output harmonics and dynamic nonlinear load. Firstly, an analysis parameter S-r is defined to address the possible impacts of the varying operational frequency to output THD and ZVS features. Secondly, an integrated control scheme is presented to implement pulse-width control at heavy load and frequency regulation at light load. Lastly, an experimental prototype is accomplished with the peak voltage of 35V and the output power of 120W. The accordance of experimental results and theoretical analysis testifies that the proposed control scheme can achieve the low harmonics and high conversion efficiency over a wide scope of operational conditions. Copyright (c) 2016 John Wiley & Sons, Ltd.