Mitigation of High-Frequency CM Conducted EMI in Offline Switching Power Supplies

Ashritha, M; Sudheer, M. L.

doi:10.1109/emcsi.2018.8495332

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…(see equation below) Table 2 shows the estimated values of parasitic parameters which are recorded from the datasheet, used for calculation of frequency responses. The estimated value of parasitic parameters is substituted in (8) to (10) and (12) to (14). The resonant frequencies f cm1 and f cm4 are equal and calculated to be 5.2 MHz.…”

Section: Noise Modelmentioning

confidence: 99%

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Mitigation of CM conducted EMI in flyback converter using balancing capacitors

Manjunath

Sudheer

2020

IET power electron.

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The offline Switched Mode Power Supply (SMPS) draw non-sinusoidal line current from the utility power supply, thereby introducing unwanted harmonics and also generate significant electromagnetic interference (EMI). Power factor correction (PFC) converters can be used to improve the power factor. But they also generate EMI in both Differential Mode (DM) and Common Mode (CM). In this paper, the EMI generated by the flyback PFC converter is addressed. A lumped circuit model for CM conducted EMI generated in a flyback converter, including the HF transformer's parasitics and the components, is considered. The parasitics of the HF transformer are calculated and measured experimentally. Using them, the resonant frequencies of the flyback converter are calculated for validation. A technique for determining the required balancing capacitor to mitigate CM conducted EMI is presented. A novel technique by splitting this balancing capacitor with their mid-point grounded for further reduction of this EMI is presented. This technique can eliminate the C y capacitors of the EMI line filter connected between line/neutral to the ground. Hence for the same amount of CM conducted EMI mitigation, the size and the cost of EMI line filters are reduced. Theoretical analysis, simulation results, and experimental verifications are presented.

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Section: Noise Modelmentioning

confidence: 99%

“…Some of the literature's balancing winding technique is cancellation winding [10,11] and shielding layers [12]. The second category is by adding a balancing capacitor [13][14][15][16]. There has not been a clear explanation in the literature about calculating the balancing capacitor's value.…”

Section: Introductionmentioning

confidence: 99%