反激式开关电源的电磁干扰建模及抑制方法分析

doi:10.19784/j.cnki.issn1672-0172.2021.02.0011

Abstract

Abstract: Switching power supply has been widely used in many fields, and the high frequency characteristics of switching power supply lead to serious interference problems. If the relationship between single component and EMI can be made clear in design, and then EMI control of switching power supply can be achieved by parameter control, it will play a great role in the development and design of switching power supply. In this paper, the author takes EMI modeling and suppression method analysis of flyback switching power supply as the breakthrough point, analyzes the equivalent model of transformer, obtains the influence mechanism of transformer parasitic capacitance on disturbance voltage, proposes an EMI suppression method to compensate transformer parasitic capacitance by adding capacitance, and verifies the effectiveness of this method by experiments.

Key words: Flyback switching power supply, Electromagnetic interference modeling, Inhibition method

CLC Number:

WANG Jing, HUANG Meng, FENG Shangxian, CHEN Ningning. EMI modeling and suppression method analysis of flyback switching power supply[J]. Journal of Appliance Science & Technology, 2021, 0(2): 78-82.

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EMI modeling and suppression method analysis of flyback switching power supply

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