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Modal Characterization of Power-Line Filter Capacitors

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6 Author(s)
Sanchez, A.M. ; Grup de Recerca en Electromagn. i Comunicacions (GRECO), Univ. Ramon Llull (URL), Barcelona, Spain ; Perez, A. ; Regue, J.R. ; Ribo, M.
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A typical power-line filter is composed, essentially, by common-mode chokes, X-class and Y-class capacitors. A good characterization of these components is needed to develop a technique to design the optimal power-line filter for an electric or electronic device by finding their best values. In this paper, a new methodology to characterize the behavior of power-line filter capacitors is presented. This methodology is based on a model where common-mode and differential-mode interference are separated into different ports in order to facilitate the study of the propagation phenomena. The methodology is used to explain modal conversion inside impedance networks with X-class and Y-class capacitors, to predict the common-mode and differential-mode emissions when these capacitors are connected to electric or electronic devices, and to improve the classical methodology of power-line filter implementation finding the optimal capacitances of the impedance networks. This new methodology has been successfully tested by using real measurements from capacitors and electric devices.

Published in:

Power Delivery, IEEE Transactions on  (Volume:25 ,  Issue: 1 )