Effects of X Capacitors on EMI Filter Effectiveness
Hung-I Hsieh
Jhong-Shu Li
Dan Chen
Nat. Taiwan Univ., Taipei;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb. 2008
Volume: 55,
Issue: 2
On page(s): 949-955
ISSN: 0278-0046
INSPEC Accession Number: 9748405
Digital Object Identifier: 10.1109/TIE.2007.896258
Current Version Published: 2008-01-31
Abstract
The suppression mechanism of the differential-mode noise of an X capacitor in offline power supplies is, for the first time, attributed to two distinct concepts: 1) impedance mismatch (regarding a line impedance stabilization network or mains and the equivalent power supply noise source impedance) and 2) C(dv/dt) noise current balancing (to suppress mix-mode noise). The effectiveness of X capacitors is investigated with this theory, along with experimental supports. Understanding of the two aforementioned mechanisms gives better insight into filter effectiveness, which may lead to a more compact filter design.
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