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.
Highlights
The capacitor charging power supply (CCPS) is an important power charging means for industrial and military applications such as distribution energy storage in capacitors
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
The compact structure of high power density CCPS complicates stray parameters, which cannot be ignored in high-frequency domain
Summary
The capacitor charging power supply (CCPS) is an important power charging means for industrial and military applications such as distribution energy storage in capacitors. Because increasing the switching frequency is a common manner to obtain high power density, which means shorter transition time during turn-on and off for semiconductor devices and leads to greater high-frequency interference. The compact structure of high power density CCPS complicates stray parameters, which cannot be ignored in high-frequency domain. The conducted EMI (Electromagnetic Interference) in high power density CCPS is exacerbated and it often causes charging failure under certain working situations or loads such as parallel power supply. Most of the present models for CCPS do not take into account of the transient switching interference, and the stray parameter obtaining methods are complicated [1]. Analysis of the power supply operation process was conducted and afterwards the required noninear elements were modeled, mainly considering the stray parameters in high frequency transformer and the interference of the transient switching harmonics. The study of the EMI in CCPS can improve its performance and provide guidelines for further power supply design of higher power density
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