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Dual-Frequency Ultra-Wide-Load Resonant Inverter for Electrosurgical Generator System
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DOI：10.1109/TPEL.2025.3625568.png)
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Abstract
En 中文
This letter presents a dual-frequency electrosurgical generator (ESG) based on a Class EF inverter, designed to accommodate ultra-wide impedance variations encountered during surgical procedures. The inherent load-insensitive characteristics of the Class EF inverter at a single frequency are further enhanced through the adoption of a dual-frequency operation strategy. To explore the design potential, inequality constraints and an impedance-based analysis method are employed. High operational efficiency is established as the primary design goal, and a simple dual-frequency and current control scheme is implemented to maintain stable output power. In the experimental validation, a 3/4-MHz ESG system is developed, achieving an efficiency above 63% and delivering 20 W of output power across a wide load range of 50–1500 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\Omega$</tex-math></inline-formula>.
Keywords:
Dual-frequency design
electrosurgical generator (ESG)
inequality constraints
ultra-wide load variation
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