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http://dx.doi.org/10.5302/J.ICROS.2002.8.2.097

Study on the Implementation of the Digital Controller of High-Speed PWM Current Amplifier  

Ko, Deog-Hwa (Dept.of Electronics Engineering, Busan National University)
Baek, Kwang-Ryul (Dept.of Electronics Engineering, Busan National University)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.8, no.2, 2002 , pp. 97-103 More about this Journal
Abstract
This paper deals with a PWM(Pulse Width Modulation) current amplifier using digital controller in order to generate a gradient magnetic field far the MRI(Magnetic Resonance Image) system. Because of tolerance of discrete devices, it is difficult to set accurate values of the control parameters and to make an analog-controlling circuit. However, using digital controller, it is possible to set exact control parameters and to adopt a modern control techniques. It is shown that the digital controller will highly enhance the output current response and it will improve the quality of the MRI.
Keywords
PWM; MRI; digital controller; gradient coil;
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