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RISS 인기검색어
- 검색키워드
- 저자 : Kaining Fu (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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High side flyback circuit configuration for CM noise cancellation
Fu, Kaining,Chen, Wei The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.5
Flyback topologies have advantages in terms of low cost, fewer electrical components, and simple circuit design. Semiconductor devices in the primary and secondary sides are regarded as major EMI noise sources in EMI propagation paths. However, the same transformers under different circuit configurations can bring different noise cancellation effects due to a change of the electric potential distribution in transformer windings as well as the phases of the EMI noise sources in the primary and secondary sides. In this paper, a CM noise cancellation mechanism is investigated. In addition, a flyback topology with high side gate driving in the primary side is proposed to form a CM noise cancellation mechanism. Based on the proposed flyback topology, the capacitor compensation cancellation technique can be applied to lower the electromagnetic interference (EMI) noise level of the designed converter. Finally, the experimental noise spectrums are used to verify the effectiveness of the proposed flyback circuit configuration scheme.
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Balance Winding Scheme to Reduce Common-Mode Noise in Flyback Transformers
Kaining Fu,Wei Chen 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
The flyback topology is being widely used in power adapters. The coupling capacitance between primary and secondarywindings of a flyback transformer is the main path for common-mode (CM) noise conduction. A Y-cap is usually used toeffectively suppress EMI noise. However, this results in problems in space, cost, and the danger of safety leakage current. In thispaper, the CM noise behaviors due to the electric field coupling of the transformer windings in a flyback adapter withsynchronous rectification are analyzed. Then a scheme with balance winding is proposed to reduce the CM noise with atransformer winding design that eliminates the Y-cap. The planar transformer has advantages in terms of its low profile, goodheat dissipation and good stray parameter consistency. Based on the proposed scheme, with the help of a full-wave simulationtool, the key parameter influences of the transformer PCB winding design on CM noise are further analyzed. Finally, a PCBtransformer for an 18W adapter is designed and tested to verify the effectiveness of the balance winding scheme.
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Balance Winding Scheme to Reduce Common-Mode Noise in Flyback Transformers
Fu, Kaining,Chen, Wei The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
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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Improving differential mode inductance in toroidal common mode inductors
Kaining Fu,Zhenzhu Lian,Wei Lan,Damin Zhang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.12
Toroidal inductors are widely used in switch mode power supplies to attenuate electromagnetic interference (EMI). However, conventional common mode (CM) inductors have limitations in achieving diff erential mode (DM) noise attenuation and may introduce near-field coupling. In this paper, the advantage and disadvantage of conventional CM inductors are investigated. An integrated inductor scheme is proposed to overcome the limitation. The proposed scheme maintains the same CM inductance as conventional toroidal CM inductors while significantly increasing the DM inductance and reducing leakage flux. This leads to reduced weight and size of discrete DM inductors and enables higher power density of the converter. The theoretical analysis is conducted using the equivalent magnetic reluctance model. Further validation is performed through 3D finite element method simulations, insertion loss measurements, and CM and DM noise spectrum measurements. Results demonstrate that the proposed integrated inductor scheme offers superior EMI performance compared with conventional CM inductors.
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