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Evaluation of Total Harmonic Distortion of Input Power between Single- and Three-Phase Flyback Converters in Capacitor Discharge Application

Soon-Cheol Chung1, Ji-Hun Jo 1, Mi-Hyun Choi1, Pil Kee Min2, Jeong-Han Yi1, and Hyung-Sik Kim1
1. Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, School of ICT Convergence Engineering, College of Science and Technology, Konkuk University, Chungju, South Korea
2. Human Life Design, Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology (JAIST), Nomi, Ishikawa 923-1292, Japan
Abstract—In this study, we evaluated a three-phase power supply to improve input power quality for the capacitive charging and discharging application. The power supply consisted of three flyback inductors, and microcontroller to generate switching pulses and film capacitor for high-energy charging and discharging. Two of three discrete power switches successively switched on with overlapped 60° of phase to make the current flows continuously. From the computer simulation, we confirmed this method achieves 1.3% of Total Harmonic Distortion (THD) and power factor of 0.96. Also, the input current waveform follows the input voltage waveform. To verify the proposed method, we implemented and tested the prototype system. Through the experiments, we confirmed the total harmonic distortion was 2.7% and the power factor was 0.94 in 50 Hz discharge condition with maintaining 1,200 charged voltages in high-voltage capacitor.
 
Index Terms—Total Harmonic Distortion (THD), power supply, three-phase, dc-dc converter, capacitor discharge

Cite: Soon-Cheol Chung, Ji-Hun Jo, Mi-Hyun Choi, Pil Kee Min, Jeong-Han Yi, and Hyung-Sik Kim, "Evaluation of Total Harmonic Distortion of Input Power between Single- and Three-Phase Flyback Converters in Capacitor Discharge Application," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 8, No. 5, pp. 254-261, September 2019. Doi: 10.18178/ijeetc.8.5.254-261
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