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Design of Alternating Magnetic Field Stimulator Using Duty Factor

  • Jang, Tae-Sun (Department of Oriental Biomedical Engineering, Sangji University) ;
  • Lee, Jin-Yong (Department of Oriental Biomedical Engineering, Sangji University) ;
  • Lee, Hyun-Sook (Department of Oriental Biomedical Engineering, Sangji University) ;
  • Kim, Sun-Wook (Department of Oriental Biomedical Engineering, Sangji University) ;
  • Hwang, Do-Guwn (Department of Oriental Biomedical Engineering, Sangji University)
  • Received : 2011.09.19
  • Accepted : 2012.02.27
  • Published : 2012.03.31

Abstract

We have developed an alternating magnetic field stimulation system consisting of a switched-mode power supply and a digital control circuit which modulates a duty ratio to maintain a magnetic field intensity of a few mT even while the frequency increases up to 4 kHz with a controllable coil temperature below $30^{\circ}C$ in air. This duty ratio modulation and water circulation are advantageous for cell culture under ac-magnetic field stimulation by preventing the incubator from exceeding a cell-viable temperature of $37^{\circ}C$. Although the temperature of the coil when subjected to a sinusoidal voltage rapidly increased, that of our system modulated by the duty factor did not change. This is a potentially valuable method to investigate the effects of intermediate frequency magnetic field stimulation on biological entities such as cells, tissues and organs.

Keywords

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