TITLE:
A Study on the Conducted Interference of Capacitor Charging Power Supply
AUTHORS:
Xiao Han, Yinghui Gao, Yaohong Sun, Ping Yan
KEYWORDS:
Capacitor Charging Power Supply; Electromagnetic Transient; Distributed Parameter Circuits; High Frequency and High Voltage Transformer; Frequency Domain Analysis
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
November
14,
2013
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.