High-Frequency Magnetic Pulse Generator for Low-Intensity Transcranial Magnetic Stimulation

This paper presents a high-frequency (HF) magnetic pulse generator designed for low-intensity transcranial magnetic stimulation (LI-TMS) applications. HF pulse stimulation can induce a strong electric field with minimal current and enhance the penetration depth of the electric field in human tissue....

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Bibliographic Details
Published in:Electronics (Basel) 2024-08, Vol.13 (16), p.3160
Main Authors: Shin, Seungjae, Kim, Hyungeun, Jeong, Jinho
Format: Article
Language:English
Subjects:
Achievement tests
Coils
Design
Electric fields
Electric potential
Energy dissipation
Human tissues
Magnetic fields
Nervous system diseases
Penetration depth
Pulse generators
Resonant frequencies
Semiconductor industry
Transcranial magnetic stimulation
Transistors
Voltage
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Summary:This paper presents a high-frequency (HF) magnetic pulse generator designed for low-intensity transcranial magnetic stimulation (LI-TMS) applications. HF pulse stimulation can induce a strong electric field with minimal current and enhance the penetration depth of the electric field in human tissue. The HF magnetic pulse generator was designed and fabricated using a microcontroller unit, gate driver, full-bridge coil driver, and stimulation coil. Measurements with a full-bridge circuit supply voltage of 10 V demonstrated an electric field intensity of 6.8 Vpp/m at a frequency of 1 MHz with a power dissipation of 2.45 W. Achieving a similar electric field intensity at a frequency of 100 kHz required approximately ten times the coil current. Additionally, a quasi-resonant LC load was introduced by connecting a capacitor in series with the stimulation coil, which set the resonant frequency to approximately 10% higher than the frequency of 1 MHz. This approach reduced the coil impedance, achieving higher current with the same bias supply voltage. Experimental results showed an enhanced electric field intensity of 19.1 Vpp/m with a supply voltage of only 1.8 V and reduced power dissipation of 1.11 W. The proposed HF pulse train with quasi-resonant coil system is expected to enable a low-power LI-TMS system.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics13163160