T11.5 - Class-Er Inverter: High-Frequency Inverter with Varicap-Based Lossless Voltage-Stress Reduction

Wednesday, March 25, 2026

9:50 AM - 10:10 AM CT

Location: 214C

Technical Lecture Presenter(s)

Wenqi Zhu (he/him/his)

Tokyo University of Science

Presentation

Co-Author(s)

YX

Yinchen Xie

Chiba University
AK

Ayano Komanaka

Chiba University
Yutaro Komiyama

Chiba University
Xiuqin Wei

Chiba Institute of Technology
HK

Hirotaka Koizumi

Tokyo University of Science
HS

Hiroo Sekiya

Graduate School of Mathematics and Information Science, Chiba University

This paper proposes a novel high-frequency single-switch inverter: the class-ER inverter. The proposed topology leverages the nonlinear capacitance of a varicap diode to suppress switch voltage stress. Notably, the varicap diode remains reverse-biased during steady-state operation, thereby avoiding the additional losses associated with switch-clamping-based or harmonic-injection-based methods. Circuit analysis and design guidelines are presented to ensure ZVS operation. A 25 V, 2 MHz experimental prototype was implemented and tested. The measured peak switch voltage was 71.1 V, representing a 20.1% reduction compared to a conventional class-E inverter. ZVS operation was successfully achieved, validating the proposed analysis and demonstrating the effectiveness of the class-ER inverter.