Abstract：As power electronic power converters move towards higher frequencies, it exacerbates the electromagnetic interference (EMI) issues in power electronic systems. Accurate modeling of common-mode chokes is crucial in designing EMI filters and predicting EMI noise in power converter systems. However, existing models struggle to represent the complex parasitic parameter structure inside common-mode chokes accurately. It leads to significant discrepancies between the actual filtering characteristics of common-mode chokes operating at high frequencies and their ideal designs. Particularly concerning are the insertion loss characteristics at multiple resonance points, where existing models struggle to fit the multi-resonance characteristics of common-mode chokes and exhibit entirely different insertion loss trends at high frequencies. Common-mode chokes can be divided into common-mode and differential-mode components based on the flow path of their magnetic flux. This paper primarily focuses on the analysis and modeling of the differential-mode component. The impedance testing method of traditional common-mode choke differential- mode models does not comply with the EN55017 testing standard. The main difference is that traditional impedance testing typically involves shorting one port of the common-mode choke to measure the differential- mode component. However, shorting the port alters the actual path of the differential-mode current, thereby failing to accurately characterize the complete inter-winding capacitance distribution of common-mode chokes, resulting in different trends between the two testing methods above 10 MHz. Additionally, the traditional common-mode choke differential-mode model assumes ideal inductance. However, when connected in series with the common-mode component at high frequencies, this idealization alters the filtering characteristics of the model's common-mode component. Therefore, the proposed differential-mode model should not exhibit a counteracting effect on common-mode current. Firstly, by analyzing the electromagnetic field distribution inside common-mode chokes, a new high-frequency model is proposed. This new model, when considering inter-winding capacitance, divides the inductance of the differential-mode component of one winding into two equal parts based on existing terminal capacitance. Furthermore, a new inter-winding parasitic capacitance branch is added between the two parts of the inductance, in conjunction with the existing terminal capacitance branch, to simulate the complete inter-winding electric field characteristics. Setting the differential-mode inductance as a coupled inductance with a coupling coefficient of -1 can fully counteract its influence on the common-mode component. This proposed model accurately fits the insertion loss characteristics of the differential-mode component of common-mode chokes under the EN55017 testing standard's multiple resonance points. Secondly, an equivalent circuit model is established under different insertion loss tests. Utilizing principles such as star-to-delta transformation and the Wheatstone bridge balance principle, the equivalent circuit is simplified, and circuit expressions are derived. Then, a comprehensive process for extracting parasitic parameters within the new model is proposed. Experimental conclusions are as follows. (1) Setting the inductance model of the differential-mode component as a coupled inductance with k =-1 does not attenuate common-mode current. (2) Compared with traditional models, the proposed new model exhibits good fitting accuracy within the frequency range of 150 kHz to 30 MHz and effectively represents the multi-resonance characteristics of common-mode chokes.
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