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Chopper Application for Magnetic Stimulation

Journal of Magnetics, Volume 15, Number 4, 31 Dec 2010, Pages 213-220
Sun-Seob Choi (Department of Radiology/Neuro Radiology Section, Dong-A University Medical Center), Sun-min Lee (Department of Occupational Theraphy, Dong-ju College University), Jun-Hyoung Kim (Hye Kwang High School), Whi-Young Kim * (Department of Biomedical Engineering, Dong-ju College University)
Abstract

Since the hypothalamus immediately reacts to a nerve by processing all the information from the human body and the external stimulus being conducted, it performs a significant role in internal secretion; thus, a diverse and rapid stimulus pulse is required. By detecting Zero Detector accurately via the application of AVR on-Chip (ATMEL) using commercial electricity, chopping generates a stimulus pulse to the brain using an IGBT gate to designate a new magnetic stimulation following treatment and diagnosis. To simplify and generate a diverse range of stimuli for the brain, chopping can be used as a free magnetic stimulator. Then, commercial frequency (60Hz) is chopped precisely at the first level of the leakage transformer to deliver an appropriate stimulus pulse towards the hypothalamus when necessary. Discharge becomes stable, and the chopping frequency and duty-ratio provide variety after authorizing a high-pressure chopping voltage at the second level of the magnetic stimulator. These methods have several aims. The first is to apply a variable stimulus pulse via accurate switching frequency control by a voltaic pulse or a pulse repetition rate, according to the diagnostic purpose for a given hypothalamus. Consequently, the efficiency tends to increase. This experiment was conducted at a maximum of 210 W, a magnetic induced amplitude of 0.1~2.5 Tesla, a pulse duration of 200~350 μs, magnetic inducement of 5 Hz, stimulus frequency of 0.1~60 Hz, and a duration of stimulus train of 1~10 sec.

 

Keywords: stimulus pulse; detecting zero detector; commercial frequency; duty-ratio; chopping
DOI: 10.4283/JMAG.2010.15.4.213
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