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Multiresonant-Frequency Filter for an Electrosurgery Inverter
Congbo Bao1, Sudip K Mazumder1
1Electrical and Computer Engineering Department, University of Illinois at Chicago, Chicago, IL, USA.
Abstract:
This paper presents a multi-resonant-frequency (MRF) filter for a high-frequency inverter (HFI) used in electrosurgery. The fundamental (sinusoidal) output frequency of the HFI is 390 kHz and is the same as the switching frequency of the HFI. The MRF is designed to extract the fundamental frequency of the tri-state bipolar waveform, generated by the HFI operating with phase-shift control. The structure and operation of the MRF are outlined. An experimental 300 W GaN-FET-based HFI prototype is developed to validate the feasibility of the proposed MRF under closed-loop control.
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