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http://dx.doi.org/10.5515/KJKIEES.2014.25.3.319

Evaluation of Y-Cap Capacitance in EMI Filter Design Using Measured S-Parameter  

Kim, Jonghyeon (Department of Electronic and Computer Engineering, Sungkyunkwan University)
Jeon, Jiwoon (Department of Electronic and Computer Engineering, Sungkyunkwan University)
Kim, Taeho (Department of Electronic and Computer Engineering, Sungkyunkwan University)
Kim, Sungjun (Department of Electronic and Computer Engineering, Sungkyunkwan University)
Nah, Wansoo (Department of Electronic and Computer Engineering, Sungkyunkwan University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.25, no.3, 2014 , pp. 319-332 More about this Journal
Abstract
Insertion loss is used as the character to express the efficiency of EMI filter. In this paper, we studied the better method that can measure the insertion loss of EMI filter exactly than the original method. For the achievement of this, the method measuring both common mode(CM) and differential mode(DM) insertion loss with arbitrary input/output impedance is accomplished using a 4-ports S-parameters system for consideration of unbalanced factor. Using this method, when input/output used in specific system is known, CM/DM insertion loss of EMI filter inserted in the system can be calculated. Finally, we applied 4-ports modeling method to 'X/Y capacitor part' and suggested the algorithm for selecting suitable the value of Y-capacitor using mixed mode S-parameters and mixed mode chain S-parameters.
Keywords
EMI Filter; S-Parameter; Insertion Loss; Mixed Mode S-Parameter; 4 Port Equivalent Model;
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