Common-Mode Noise Cancellation by an Antiphase Winding in Multilayer Isolated Planar Transformer

Chan, Yick Po; Pong, Bryan Man Hay; Poon, N.K.; Liu, Joe Chui Pong

doi:10.1109/temc.2013.2272580

Cited by 28 publications

(10 citation statements)

References 16 publications

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“…Besides, the Litz wire is with the insulation and twisting effects. The analytical model with (7,8) does not consider all the skin and proximity effects in strand and bundle level [16].…”

Section: B Casementioning

confidence: 99%

See 1 more Smart Citation

The Faraday Shields Loss of Transformers

Shen

Kaymak

Wang

et al. 2020

IEEE Trans. Power Electron.

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“…Besides, the Litz wire is with the insulation and twisting effects. The analytical model with (7,8) does not consider all the skin and proximity effects in strand and bundle level [16].…”

Section: B Casementioning

confidence: 99%

“…So, the capacitive coupling between the primary and secondary is significantly reduced. The Faraday shield is widely used in sensitive electronics such as audio circuits, electric vehicles [3,4], PV systems [5], and high-frequency transformers in converters [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Faraday Shields Loss of Transformers

Shen

Kaymak

Wang

et al. 2020

IEEE Trans. Power Electron.

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“…The shield technology is combined with the potential matching method in [11], but there are still the common shortcomings of the shield technology. The third method is to optimize the transformer architecture, mainly including the balanced winding method [4,[12][13][14][15] and the potential matching method [16][17][18][19][20][21]. The balanced winding method in [15] optimizes CM noise by canceling out the two opposite displacement currents from the primary and secondary sides to the balanced winding.…”

Section: Introductionmentioning

confidence: 99%

“…The third method is to optimize the transformer architecture, mainly including the balanced winding method [4,[12][13][14][15] and the potential matching method [16][17][18][19][20][21]. The balanced winding method in [15] optimizes CM noise by canceling out the two opposite displacement currents from the primary and secondary sides to the balanced winding. However, the lack of accurate modeling [12] makes the suppression effect unable to be quantitatively evaluated.…”

Section: Introductionmentioning

confidence: 99%

An EMI‐Optimized Transformer for De‐Y Flyback Converter with Low Common‐Mode Noise

Wang

Shao

Liu

et al. 2021

IEEJ Transactions Elec Engng

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member Y-capacitors are widely used in flyback converters to suppress common-mode (CM) noise to comply with the strict electromagnetic interference (EMI) standards. However, Y-capacitors increase the leakage current between the primary and secondary side, which is not allowed in the applications with high safety requirements. In this paper, the displacement current models of two conventional De-Y methods are quantitatively established to analyze their limitations for the flyback converter. Then, a hybrid EMI-optimized transformer is proposed to improve the limitations. The proposed structure can completely balance the CM noise between the primary and secondary sides, making the flyback converter comply with the EMI standard under the conditions of no Y-capacitor. Compared with the traditional methods, the proposed method has a better capability for CM noise suppression, higher universality and the same cost. Finally, the simulation and experimental results verify that the CM noise of the new transformer structure decreases about 10 dB compared with that of the conventional one.

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“…Various CM Conducted noise reduction techniques for switched mode converters have been proposed in the literature [9][10][11][12][13][14][15]. One such noise reduction technique [9] has been proposed by D. Cochrane et.al.…”

Section: Introductionmentioning

confidence: 99%

CM Conducted EMI mitigation in flyback PFC converter

Ashritha

Sudheer

2019

Electr Eng

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The switched mode power supplies offer many advantages in power conversion. But they offer low power factor and generate electromagnetic interference (EMI). The low power factor can be improved by a front-end power factor correction (PFC) unit. However, they also generate EMI in both differential mode and common mode (CM). The interwinding capacitance of the transformer and parasitic capacitance between the heat sink and ground are major contributors to CM noise. The traditional method to minimize the CM noise by using a line filter consists of CM choke and Y capacitor. But, CM noise causes leakage current to flow to the ground through the Y capacitor. This leakage current has to be restricted as per the standards for commercially used equipment and medical instruments. The technique proposed here reduces the values of Y capacitor thereby reducing the leakage current. This can be reduced by minimizing the predominant parasitic capacitances of the HF transformer used in the PFC converter. This paper presents a technique for reducing these parasitic capacitances by incorporating an additional parasitic capacitance noise cancellation winding (PCW). A flyback transformer winding capacitance model depicting the parasitic capacitances is considered, and a novel method to determine this parasitic capacitance is presented. Using this model, the CM Conducted EMI in a flyback PFC is determined by simulation and experimentation. These simulation and experimentation results are used to design an EMI line filter to reduce the Conducted CM noise to complaint levels. The value of Y capacitor now is reduced due to the addition of PCW thereby reducing the size and cost of the filter. This technique has been validated experimentally on a 30-W power factor correction flyback converter working in critical conduction mode.

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Common-Mode Noise Cancellation by an Antiphase Winding in Multilayer Isolated Planar Transformer

Cited by 28 publications

References 16 publications

The Faraday Shields Loss of Transformers

The Faraday Shields Loss of Transformers

An EMI‐Optimized Transformer for De‐Y Flyback Converter with Low Common‐Mode Noise

CM Conducted EMI mitigation in flyback PFC converter

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