T13.5 - Design of a GaN-Based Two-Stage Full-Bridge 1MHz High-Frequency Electrosurgical Generator

Wednesday, March 25, 2026

9:50 AM - 10:10 AM CT

Location: 217A

Technical Lecture Presenter(s)

Ziyue Guo (he/him/his)

College of Electrical Engineering Zhejiang University

Presentation

Co-Author(s)

XF

Xinchun Feng

College of Electrical Engineering Zhejiang University
FS

Feishuang Sun

College of Electrical Engineering Zhejiang University
YD

Yu Dou

ZJU-UIUC Institute Zhejiang University
CL

Chushan Li

Zhejiang University
WL

Wuhua Li

Zhejiang University

The Electrosurgical Generator (ESG) is a high-frequency inverter that delivers surgical cutting and coagulation power. In this work, we present the design, implementation and validation of a gallium nitride (GaN) based, two-stage full-bridge ESG operating at 1MHz. By modeling tissue load impedance, we identified an optimal switching frequency. Then we performed a detailed analysis of the two-stage topology—comprising a synchronous buck stage followed by a full-bridge inverter with output isolation capacitance. The characteristics of the resonant tank were analyzed, and corresponding operating modes along with tailored control strategies were developed to enable precise power modulation. Experiments on resistive loads confirmed the theoretical analyses and demonstrated that the prototype achieves all targeted performance metrics.