Efficiency Performance Evaluation of A Second Stage GaN Based High Frequency Inverter for Electrosurgery

Electrosurgery is a medical device that provides a thermal effect using high frequency current. When the tissue load changes over a broad scale during surgery, it should maintain a constant output power, that mean the broad output and high frequency voltage must be supplied by electrosurgery. In this study, class D resonant inverter design based on GaN is presented for electrosurgery. Due to its resonant nature, the inverter is convenient for broad scale voltage regulation and inverter switches provide ZVS (Zero Voltage Switching) operation. The technical analysis and simulation result of the proposed class D resonant inverter for different cutting modes are given. As a result, it is aimed to design an electrosurgery with high efficiency and high frequency.