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Use of a Cz Common-Mode Capacitor in 2-Wire and 3-Wire Off-Line Power Supplies
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| Author(s) |
Hung-I Hsieh, Tien-Chi Lin, Dan Chen |
| Abstract |
In a two-wire (no chassis ground) input off-line
power supply system, a capacitor is often connected between
the primary and the secondary side of the transformer for
common-mode EMI reduction. For a three-wire off-line
power supplies, such a capacitor, is also used sometime for
the same purpose. It’s unclear how this capacitor works. In
this paper, explanation of the noise suppression mechanism
and effectiveness of such a capacitor is given. From the
understanding of the mechanism, suggestions were made for
the use of such a capacitor and output inductor placement to
avoid the pitfalls and achieve desirable effects. |
| Download |
| Filename: | T8-301.pdf |
| Filesize: | 757.4 KB |
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| Type |
Members Only |
| Date |
Last modified 2007-03-08 by System |
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