A Study on the Conducted Interference of Capacitor Charging Power Supply

Xiao Han, Yinghui Gao, Yaohong Sun, Ping Yan

2Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, China 3Key Laboratory of Power Electronics and Electric Drive, CAS, Beijing, China.
University of Chinese Academy of Sciences, Beijing, China.

DOI: 10.4236/epe.2013.54B216                

Abstract

In this paper, a mathematical analysis of the EMI (Electromagnetic Interference) for a 20 kHz/10 kV capacitor charging power supply in frequency-domain is presented, and a related circuit model considering the transient switching interference is proposed. Due to the high working frequency and the device-switching transitions, the conducted EMI caused by the charging circuit which includes the harmonics of grid frequency, working frequency and device-switching transition frequencies. Thus under certain working situations or loads parallel power supply, the interference may cause charging failure. To solve this problem, a high frequency transformer modeled with stray capacitances and an approximation of the device-switching transition is applied in the Spice-based simulation model, and a mathematical analysis in frequency-domain is presented.

Keywords

Capacitor Charging Power Supply; Electromagnetic Transient; Distributed Parameter Circuits; High Frequency and High Voltage Transformer; Frequency Domain Analysis

Conflicts of Interest

The authors declare no conflicts of interest.

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