Browsing by Author "Lin, Yu-Ching"

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Delayed branch retinal artery occlusion in infectious endocarditis
(2020-07-01)
Lo, Kang-Jung
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Lin, Yu-Ching
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Li, Hsing-Yuan
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Chou, Yu-Bai
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生物科技學系
DSP-Based Current Control for Inverter-fed Permanent-Magnet Electrodynamic Shaker
(2010)
Chen, Hung-Chi
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Lin, Yu-Ching
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Liao, Jhen-Yu
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電機工程學系
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Department of Electrical and Computer Engineering
Compared to the conventional analog-circuit control and linear power amplifier for permanent-magnet electrodynamic shaker (PMEDS), a DSP-based digital current control with switched-mode power amplifier is proposed in this paper. A full-bridge converter is connected directly to PMEDS without LC filter in order to directly regulate the shaker current and simplify the digital current control. To meet the vibration requirement of wide operating range (typically 5 similar to 2kHz), the frequency of the unipolar switching scheme is increased to 50kHz PWM frequency in order to reduce the aliasing effect of the induced voltage and current harmonic sidebands. At the same time, dead-time compensation loop is also included in the digital current control to decrease the harmonics due to the dead-time in gate signals. The effectiveness of the proposed current control is verified by the provided simulation and measured results.
DSP-Based Current Control with Dead-Time Compensation for Full-Bridge-Fed Permanent-Magnet Electrodynamic Shaker
(2012)
Chen, Hung-Chi
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Lin, Yu-Ching
;
Liao, Jhen-Yu
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電機工程學系
;
Department of Electrical and Computer Engineering
Permanent-magnet electrodynamic shaker (PMEDS) can be seen as a single-phase reciprocating machine and its equivalent circuit model are an inductance, a resistance and an induced voltage in series. The induced voltage of PMEDS is near zero as the current frequency is far from the resonant frequency and its maximum operating frequency is several kHz near ten times larger than that of rotating AC machine. From the result of analysis, the dead time in gate signals has large effect on the high-frequency current tracking performance. In this paper, the PI-type controller and simple dead-time compensation loop are used to improve the current tracking performance during the range from 10Hz to 2kHz. The proposed current control is implemented in the digital DSP-based system and the full-bridge converter is connected directly to PMEDS without any LC filter. The effectiveness of the proposed current control is verified by the provided simulation and measured results.