反激变换器共模噪声的抑制

doi:10.19595/j.cnki.1000-6753.tces.181625

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Abstract As the frequency of the switching mode power supply (SMPS) tends to be higher and the size of SMPS tends to be smaller, the electromagnetic interference (EMI), which is caused by the switching of power semiconductor device, has become more serious. The common mode (CM) noise source and CM noise propagation path of flyback converter are analyzed, then the CM noise model of converter is established. Based on the distributed capacitance model of transformer, the influence of the CM noise through the path of the ferrite core is analyzed quantitatively. A quantitative analysis method for two kinds of CM noise suppression measures, incomplete shielding layer and balanced winding, is proposed. The incomplete shielding layer can be further divided into incomplete-width and incomplete-length shielding layer for different structural parameters. The x-y axis coordinate system of the transformer is established, then the expression of electric potential distribution along winding is obtained. Based on the cancellation of common mode displacement current, the calculation method of width or length of the incomplete shielding layer and the turns of the balanced winding is given. Experimental results verify the effectiveness of proposed method and the accuracy of the calculation method.

Key words： Common mode noise flyback converter distributed capacitance incomplete shielding layer balanced winding

Received: 09 October 2018 Published: 28 November 2019

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TM46

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	Articles by authors
	Liu Yan
	Dong Guangdong
	Zhang Fanghua

Cite this article:

Liu Yan,Dong Guangdong,Zhang Fanghua. Reducing Common Mode Noise in Flyback Converter[J]. Transactions of China Electrotechnical Society, 2019, 34(22): 4795-4803.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.181625 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I22/4795

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