T39.4 - A Novel 500-kHz LLC-T Resonant Converter with Wide Output Range

Thursday, March 20, 2025

11:10 AM – 11:30 AM ET

Location: Level Three, A314

Technical Lecture Presenter(s)

Zhengming Hou

Virginia Polytechnic Institute and State University

Presentation Paper

Co-Author(s)

Dong Jiao, PhD candidate

Virginia Polytechnic Institute and State University
JL

Jih-Sheng Lai

Virginia Polytechnic Institute and State University

The LLC resonant converter is attractive for the electric vehicle charging application due to its high efficiency and high power density. Nevertheless, the efficiency of the conventional LLC converter suffers from the wide switching frequency for the wide output range applications. In this paper, a novel LLC-T resonant converter, an extra auxiliary transformer in parallel with the L-C resonant tank, is proposed to narrow the switching frequency range for the EV charging application. A 500-kHz, 1.35-kW, 400-V/250-450-V prototype is built to verify the merits of the proposed converter and demonstrates 97.82% peak efficiency.