Abstract
Sandwich winding is usually used for low conduction loss and low leakage inductance in insolated converters. But it also tends to deteriorate the common mode (CM) EMI noise because of the bigger parasitic capacitances between primary and secondary windings. This paper analyzes the CM noise transferring path for typical isolated converters. Influence of different ground point location of the shielding on CM noise is investigated. A novel CM noise reduction method by optimizing the spacing between shielding and windings is proposed. The advantages of the proposed concepts and strategies are verified and demonstrated on a Fly-back converter. More than 20dB CM noise attenuation is achieved.
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