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Parallel Resonance

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:

Resonance in an AC Circuit

Resonance in an AC Circuit

The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...

Series Resonance

Series Resonance

The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...

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Characteristics of Series Resonant Circuit

Characteristics of Series Resonant Circuit

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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Published on: February 4, 2018

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.

IEEE Transactions on Power Electronics

|March 18, 2022

Summary

This summary is machine-generated.

A novel multi-resonant-frequency (MRF) filter effectively extracts the fundamental frequency from high-frequency inverter (HFI) waveforms in electrosurgery. This filter enables precise control for advanced surgical applications.

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Area of Science:

Electrical Engineering
Medical Devices
Power Electronics

Background:

High-frequency inverters (HFIs) are crucial for modern electrosurgery.
Existing HFI designs often produce non-sinusoidal waveforms, complicating precise frequency extraction.
Phase-shift control in HFIs generates tri-state bipolar waveforms requiring specialized filtering.

Purpose of the Study:

To introduce and detail a multi-resonant-frequency (MRF) filter specifically designed for HFIs in electrosurgery.
To demonstrate the MRF filter's capability in extracting the fundamental frequency from tri-state bipolar waveforms.
To validate the MRF filter's performance in a practical, closed-loop controlled HFI system.

Main Methods:

Design and theoretical analysis of the multi-resonant-frequency (MRF) filter structure.
Implementation of phase-shift control for the high-frequency inverter (HFI).
Development of a 300 W Gallium Nitride Field-Effect Transistor (GaN-FET)-based HFI prototype.
Experimental validation of the MRF filter under closed-loop control conditions.

Main Results:

The MRF filter successfully extracts the fundamental output frequency (390 kHz) from the HFI's tri-state bipolar waveform.
The proposed MRF filter operates effectively with the HFI's switching frequency.
Experimental results confirm the feasibility and performance of the MRF filter in a GaN-FET based HFI prototype.

Conclusions:

The developed multi-resonant-frequency (MRF) filter is a viable solution for precise fundamental frequency extraction in high-frequency inverters for electrosurgery.
The MRF filter enables improved waveform quality and control for electrosurgical devices.
This work validates the integration of the MRF filter with advanced GaN-FET based HFI technology.