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논문 기본 정보

자료유형
학술저널
저자정보
Kaining Fu (Fuzhou University) Wei Chen (Fuzhou University)
저널정보
전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.19 No.1
발행연도
2019.1
수록면
296 - 306 (11page)

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The flyback topology is being widely used in power adapters. The coupling capacitance between primary and secondary windings of a flyback transformer is the main path for common-mode (CM) noise conduction. A Y-cap is usually used to effectively suppress EMI noise. However, this results in problems in space, cost, and the danger of safety leakage current. In this paper, the CM noise behaviors due to the electric field coupling of the transformer windings in a flyback adapter with synchronous rectification are analyzed. Then a scheme with balance winding is proposed to reduce the CM noise with a transformer winding design that eliminates the Y-cap. The planar transformer has advantages in terms of its low profile, good heat dissipation and good stray parameter consistency. Based on the proposed scheme, with the help of a full-wave simulation tool, the key parameter influences of the transformer PCB winding design on CM noise are further analyzed. Finally, a PCB transformer for an 18W adapter is designed and tested to verify the effectiveness of the balance winding scheme.

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Abstract
Ⅰ. INTRODUCTION
Ⅱ. CM NOISE CONDUCTION PATHS AND NOISE CANCELATION MECHANICS
Ⅲ. CM CURRENT THROUGH A FLYBACK TRANSFORMER
Ⅳ. CONSIDERING THE INFLUENCE OF THE GAP BETWEEN PCB WINDING TRACES
Ⅴ. TRANSFORMER EVALUATION
Ⅵ. EXPERIMENTAL RESULTS
Ⅶ. CONCLUSIONS
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