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In this paper a transformer construction technique is proposed that effectively cut off the Common Mode (CM) noise voltage passing across the isolated primary and secondary windings. This technique employs the Zero Equipotential Line theory to construct an anti-phase winding. It effectively cuts down CM noise by eliminating the noise voltage across the isolated primary and secondary windings. The...
It is known to all that parasitic capacitances in a transformer is very critical for EMI CM noise. Generally, Faraday shielding connected at primary minus is used in most transformers to shield the induced charge and block the CM noise path. Based on CM noise balance concept, a novel noise balance configuration by adding an extra capacitor between shielding foil and primary minus was proposed to reduce...
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...
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