• Title/Summary/Keyword: Magnetic Power Supply

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The Magnetic Nerve Stimulator Using a Switching Mode Power Supply (스위칭전원을 이용한 자기신경자극기)

  • Lee, Su-Yeol;Lee, Seong-Geun;Lee, Jeong-Han
    • Journal of Biomedical Engineering Research
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    • v.16 no.3
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    • pp.265-270
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    • 1995
  • An implementation scheme of the magnetic nerve stimulator using a switching mode power supply is proposed. By using a switching mode power supply rather than a conventional linear power supply for chArging high voltage cApacitors, the weight and size of the magnetic net've stimulator can be considerably reduced. Maximum output voltage of the developed magnetic nerve stimulator using the switching mode power supply is 3,000 volts and switching time is about 100 msec Experimental results of human nerve stimulations using the developed stimulator are presented.

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Design and Implementation of AC-PDP Power Supply using Planar Magnetic Components (박형 자기소자를 이용한 AC-PDP 전원회로의 설계 및 제작)

  • Kim Myoungsoo;Choi Byungcho
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.677-681
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    • 2004
  • This paper presents the design and implementation of a low-profile power supply developed for AC-PDP application systems. In the proposed power supply, planar magnetics and SMD devices are integrated into advanced power conversion techniques to implement a low-profile power supply applicable to most AC-PDP application systems. Engineering details on the design and fabrication of planar magnetic components are presented. The performance of the prototype power supply is also demonstrated to validate the application potentials of the proposed power supply.

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Magnetic Switch Auto Control Method of the High-Voltage Pulse Power Supply (고전압 펄스 전원장치용 자기스위치 자동제어 방법)

  • Kim, Soo-Hong;Lee, Jeong-Hum;Kim, Byong-Seob;Kwon, Byung-Ki;Choi, Chang-Ho
    • The Transactions of the Korean Institute of Power Electronics
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    • v.16 no.4
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    • pp.366-373
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    • 2011
  • The magnetic switch used in pulsed-power applications is superior in its high repetition rate, high stability, and long lifetime. But magnetic switch was optimized switching operation by manual control. When the load changes, the switching state can not be optimized automatically. In this paper, the auto control method of magnetic switch for high pulsed-power proposed. The magnetic switch is used capacitor charging power supply for high-voltage compressor. The proposed method can be optimized an efficiency of the system by magnetic switch auto control according to load variation. And the proposed method verify the experimental results.

Development of Medical System using Time-varying Magnetic field (시변 펄스형 자기장 의료기기 시스템)

  • Kim, In-Soo S.;Hong, Jung-Hwang
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.11 no.12
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    • pp.2343-2351
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    • 2007
  • In this paper, we describe the design and implementation of time-varying magnetic field stimulator. Novel design for power supply part to generate high repetitive magnetic field for very short time(less than $300{\mu}s$) was achieved. Using the novel designed power supply part and the circular type coil probe, we've achieved high magnetic field up to 1.2 Tesla in 20Hz repetition rate.

Starting Current Application for Magnetic Stimulation

  • Choi, Sun-Seob;Bo, Gak-Hwang;Kim, Whi-Young
    • Journal of Magnetics
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    • v.16 no.1
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    • pp.51-57
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    • 2011
  • A power supply for magnetic-stimulation devices was designed via a control algorithm that involved a start current application based on a resonant converter. In this study, a new power supply for magnetic-stimulation devices was designed by controlling the pulse repetition frequency and pulse width. The power density could be controlled using the start-current-compensation and ZCS (zero-current switching) resonant converter. The results revealed a high-repetition-frequency, high-power magnetic-stimulation device. It was found that the stimulation coil current pulse width and that pulse repetition frequency could be controlled within the range of 200-450 ${\mu}S$ and 200-900 pps, respectively. The magnetic-stimulation device in this study consisted of a stimulation coil device and a power supply system. The maximum power of the stimulation coil from one discharge was 130 W, which was increased to 260 W using an additional reciprocating discharge. The output voltage was kept stable in a sinusoidal waveform regardless of the load fluctuations by forming voltage and current control using a deadbeat controller without increasing the current rating at the starting time. This paper describes this magnetic-stimulation device to which the start current was applied.

3-D Magnetostatic Finite Element Simulation of a Low-Tc Superconducting Power Supply with Respect to the Excitation Current (여자전류에 따른 저온초전도전원장치의 3차원 정자계 유한요소 시뮬레이션)

  • Bae, Deok-Gwon;Kim, Ho-Min;Lee, Chan-Ju;Yun, Yeong-Su;Lee, Sang-Jin
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.7
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    • pp.364-369
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    • 2002
  • In this paper, 3-D magnetostatic finite element simulation of a rotux type Low-Tc superconducing (LTS) superconducting power supply, finite element method, cryogenic system, superconducting foil by generated magnetic flux from the rotating pole. The magnetic flux density on the superconducting foil caused by two exciters is therefore sufficiently greater than its critical magnetic flux density and it is an essential point in LTS power supply design. To establish the sufficient flux path of this machine, ferromagnetic materials is used in this power supply. When ferromagnetic materials is used at extremely low temperature, its characteristic of magnetization differs to that at room temperature. For this reason, special consideration is needed in the magnetic analysis of cryogenic systems. When the excitation current is 10A, the normal spot appears on superconducting foil. The results of this analysis are calculated and compared with the experimental results. The linkage flux due to the excitation current of 10, 20, 30, 40 and 50A are respectively $1.30{\times}10-4$, $2.67{\times}10-4$, $5.08{\times}10-4$ and $6.15{\times}10-4Wb$.

The characteristic analysis of contact-less Power supply by 3D finite element method

  • Park, Han-Seok;Cho, Yun-Hyun;Jung, Hong-Sub;Woo, Kyung-il;Kim, Kyung-Ho
    • Journal of Advanced Marine Engineering and Technology
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    • v.28 no.1
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    • pp.145-151
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    • 2004
  • This paper proposes the calculation method of magnetic coupling coefficient of contact-less power supply by the 3D finite element method with a variation of the secondary core position. The primary, secondary self and leakage inductances and the capacitances of a resonant circuit are calculated by the finite element analysis results. The magnetic coupling coefficients are obtained also. The power factors are obtained by simulation for the magnetic coupling coefficients and compared.

A Pulse Power Supply for Metal Vapor Lasers (금속 증기 레이저용 펄스 전원 장치)

  • Cha Byung Heon;Lee Heung Ho;Jin Jeong Tae
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.54 no.5
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    • pp.190-197
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    • 2005
  • A reliable and compact pulse power supply using a thyratron and a magnetic pulse compression (MPC) circuit was developed for a metal vapor laser. The life time of the pulse power supply is expected to be much longer than that of a conventional thyratron-discharge type pulse power supply. A thyratron generated a long pulse of its conduction pulse width 500 ns and then it was compressed to less than 80 ns of its output voltage rise time by a three stage MPC circuit. This pulse power supply was applied to a laser plasma tube of 30 mm inner diameter and 1.5 m discharge length. It was operated several hundreds hours without any troubles.

Functional Neuromuscular Stimulation for Paraplegic Standing (FNS를 사용한 하반신마비자의 일어서기)

  • Khang, Gon
    • Journal of Biomedical Engineering Research
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    • v.11 no.1
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    • pp.1-4
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    • 1990
  • An implementation scheme of the magnetic nerve stimulator using a switching mode power supply is proposed. By using a switching mode power supply rather than a conventional linear power supply for charging high voltage capacitors, the weight and size of the magnetic nerve stimulator can be considerably reduced. Maximum output voltage of the developed magnetic nerve stimulator using the switching mode power supply is 3,000 volts and switching time is about 100 msec. Experimental results or human nerve stimulations using the developed stimulator are presented.

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Modeling for Power Supply Substation in Maglev Train System (자기부상열차 급전변전소의 모델링)

  • Lee, Yun-Seong;Kim, Jin-O;Kim, Hyung-Chul;Kim, Ju-Rak;Lee, Jun-Kyung
    • Journal of the Korean Society for Railway
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    • v.13 no.3
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    • pp.278-282
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    • 2010
  • Since a power supply substation of the magnetic levitation train system includes a inverter which is necessary to change the frequency of power, it has a different characteristic comparing to any other railway system. Nowaday a study for determining rating of facilities constituting a power supply system and modeling that system is undergoing. In this paper, a analysis model for the power supply system of the magnetic levitation train using the 3-level inverter is proposed. And the analysis for output characteristic is performed using the PSCAD/EMTDC program. The control method about the output of 3-level inverter for supplying power to loads in magnetic levitation train system is also described.