Optimized separation method for conducted EMI noise based on Mardiguian network and common mode choke
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ORIGINAL ARTICLE
Optimized separation method for conducted EMI noise based on Mardiguian network and common mode choke Mengxia Zhou1 · Zhao Yang1 · Xingfa Liu2 · Yongan Wang1 · Xianqiang Wu1 · Cheng Zhang1 · Yan Wei1,2 Received: 10 May 2020 / Revised: 6 October 2020 / Accepted: 8 October 2020 © The Korean Institute of Power Electronics 2020
Abstract Based on the characteristic parameters of a noise discrimination network (NDN), the Mardiguian network is used as an example to investigate the influence of stray capacitance on the performance of the NDN. The obtained results show that stray capacitance has a significant effect on the performance of the NDN. Considering the influence of stray capacitance, this paper proposes a network optimization method based on the Mardiguian network. The optimization method is superior to the Mardiguian network in performance, and it improves the separation accuracy of differential mode noise. Keywords EMI · NDN · DMRR · DMIL · Stray capacitance
1 Introduction With the continuous increase of the operating frequency and output power of power electronic equipment, the problem of conducted electromagnetic interference (EMI) is becoming more and more serious. Therefore, the diagnosis of conducted EMI noise has become a hot issue in electromagnetic compatibility research [1–5]. A noise discrimination network (NDN) is an effective device for EMI noise diagnosis. Therefore, there have been a large number of investigations on NDNs. Radio frequency (RF) transformers have been employed to improve the performance of NDNs by Paul Clayton, See, Mardiguian, Kersten, Caponet and others [6–10]. Clayton first proposed an NDN that employs a pair of simple RF transformers with a center tap and a ratio of 1:1. However, the mechanical switches of an NDN are used to select the output signal of the common mode/differential mode (CM/DM), which leads to network imbalance and affects the performance of the NDN [6]. The switches of * Yan Wei [email protected] 1
Jiangsu Engineering Key Lab of Electrical Equipment and Electromagnetic Compatibility, Nanjing Normal University, Nanjing, China
State Key Laboratory of Power Grid Environmental Protection, China Electric Power Research Institute, Wuhan, China
2
an NDN were eliminated by See, which can achieve separated CM/DM noise simultaneously while improving the performance of the network [7]. Furthermore, a simpler NDN was designed by Mardiguian, which employs only one transformer with a ratio of 2:1 to achieve CM/DM noise separation simultaneously [8]. The NDN proposed by Ting Guo employs a 0°/180° RF power mixer, which reduces the influence of stray parameters and improves the separation performance. However, the high cost of a RF power mixer has limited its wide application [9]. Caponet et al. employed two different NDNs to diagnose conducted EMI noise [10]. However, the structure and diagnostic methods are complex. Although great progress has been made in the investigations of NDNs [11–17], comprehensive technology research of NDNs is still insu
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