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http://dx.doi.org/10.18770/KEPCO.2020.06.04.473

High-Frequency Equivalent Circuit Model for Differential Mode Noise Analysis of DC-DC Buck Converter  

Shin, Juhyun (Department of Electrical Engineering, Chung Nam National University)
Kim, Woojung (SK Innovation)
Cha, Hanju (Department of Electrical Engineering, Chung Nam National University)
Publication Information
KEPCO Journal on Electric Power and Energy / v.6, no.4, 2020 , pp. 473-480 More about this Journal
Abstract
In this paper, we proposed a high frequency equivalent circuit considering parasitic impedance components for differential noise analysis on the input stage during DC-DC buck converter switching operation. Based on the proposed equivalent circuit model, we presented a method to measure parasitic impedance parameters included in DC bus plate, IGBT, and PCB track using the gain phase method of a network analyzer. In order to verify the validity of this model, a DC-DC prototype consisting of a buck converter, a signal analyzer, and a LISN device, and then resonance frequency was measured in the frequency range between 150 kHz and 30 MHz. The validity of the parasitic impedance measurement method and the proposed equivalent model is verified by deriving that the measured resonance frequency and the resonance frequency of the proposed high frequency equivalent model are the same.
Keywords
Differential Mode Noise; High Frequency Equivalent Circuit; Parasitic Impedance; EMI; Impedance Measurement Method; Resonance Frequency;
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