Modeling of conducted EMI in flyback switching power converters

Britto, K. R. Aravind; Dhanasekaran, R.; Vimala, R.; Saranya, B.

doi:10.1109/iconraeece.2011.6129801

Cited by 11 publications

(6 citation statements)

References 16 publications

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“…7b shows the V X LISN port conducted emission noise spectrum from 10 kHz to 200 MHz. The V X port noise is a combination of DM and CM noises, and from (2) and (4) it is obtained as…”

Section: Device Heatsink Impedance Propertiesmentioning

confidence: 99%

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Analysis, modelling and measurement of the effects of aluminium and polymer heatsinks on conducted electromagnetic compatibility in DC–DC converters

Grobler

Gitau

2017

IET Science, Measurement & Technology

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Abstract-Effects of polymer heatsink materials on EMI noise in converters have not been adequately investigated. Heatsinks provide a path to ground for the common-mode noise. Selecting an appropriate heatsink material can therefore help reduce common-mode noise by increasing noise path impedance.Effects of heatsinks on EMI noise over the conducted frequency band will be investigated. The critical parameter is the heatsink-to-device capacitance and accurate models of the heatsink impedance need to be developed. This is necessary for results that are accurate enough to allow prequalification of a converter as would happen in an accredited environment. However, simplified common-mode and differential-mode models of the step-down DC-DC converter circuit are adequate to predict the effects of the heatsink on the conducted noise. This paper will demonstrate that compared to a solid aluminium material, using polymer material incorporating conductive fillers in low power converters can greatly lower the device-to-heatsink capacitance, and still be adequate for heat dissipation in lower powered converters. This in turn reduces common-mode noise in the frequency band below 30 MHz. The measurement test setup is configured according to the MIL-STD-461F accredited test environment. It consists of a wideband two-port LISN, a properly grounded copper sheet as required by the standard, a suspended feed-line from the LISN to the DUT and an oscilloscope recording the data.

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“…7b shows the V X LISN port conducted emission noise spectrum from 10 kHz to 200 MHz. The V X port noise is a combination of DM and CM noises, and from (2) and (4) it is obtained as…”

Section: Device Heatsink Impedance Propertiesmentioning

confidence: 99%

“…This improves the design efficiency and shortens the crucial time to market period [1], [2]. It is also beneficial to be able to model the electromagnetic compatibility (EMC) issues concurrently with the power components as well as thermal management design phase [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis, modelling and measurement of the effects of aluminium and polymer heatsinks on conducted electromagnetic compatibility in DC–DC converters

Grobler

Gitau

2017

IET Science, Measurement & Technology

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“…Managing electromagnetic interference (EMI) in a power converter should be made an integral part of the design process in order to optimise the overall system design. This improves the design efficiency and shortens the crucial time to market period [1][2][3][4]. It is also beneficial to be able to model the electromagnetic compatibility (EMC) issues concurrently with the power processor hardware and the thermal management design phase.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, power feed-line and load are not considered. Another circuit model reported in [3] uses ORCAD circuit analysis, showing 1-port results ignoring the ground return as well as the power feed-line effect. In [5] a good predictive conducted EMC modelling method is presented, using an expensive software tool SABER, not readily available in a development laboratory.…”

Section: Introductionmentioning

confidence: 99%

“…It is also beneficial to be able to model the electromagnetic compatibility (EMC) issues concurrently with the power processor hardware and the thermal management design phase. There is a need therefore, for an affordable, accurate, practical and intuitive EMI modelling and prediction technique suitable for use as an easy design tool [3]. The results obtained using the model should be accurate enough compared to the actual accredited facility measurements [5], building confidence that the converter designed will pass the qualification tests [2], [4].…”

Section: Introductionmentioning

confidence: 99%

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Modelling and measurement of high‐frequency conducted electromagnetic interference in DC–DC converters

Grobler

Gitau

2017

IET Science, Measurement & Technology

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Abstract-Conducted EMC noise qualification tests are normally carried out after a prototype has been designed, built and tested and the process is repeated in the event of non-compliance. The ability to determine compliance with EMI standards at the design stage is therefore desirable. This paper will present conducted EMC noise modelling and measurement techniques, yielding simulated and measurement noise results accurate enough to serve as a prequalification test at the design and prototyping stages respectively.Accurate models of the power feed-line connecting the LISN to the DUT (converter), including the load are developed. Predictive conducted EMC modelling is accomplished using detailed active level 3 SPICE-based models, creating a real-time circuit model consisting of a complete converter in its operational state, without the need to separate into equivalent models. Effects of the power feed-line length on EMI noise measurements are investigated as currently available literature has not dealt adequately with this issue. To detect possible radiating frequencies that might emerge with the conducted noise and are detectable in the conducted emission test, results have to be accurate not just in the prescribed frequency band, but all the way up to 100 MHz. The modelling and measurements are performed using software and instruments available in a development laboratory.

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Electromagnetic interference frequencies prediction model of flyback converter for snubber design

Rucinski

Musznicki

Chrzan

2015

IET Power Electronics

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Snubber design for flyback converters usually requires experimental prototype measurements or simulation based on accurate and complex models. In this study simplified circuit modelling of a flyback converter has been described to dimension snubbers in early stage of design process. Simulation based prediction of the transistor and diode ringing frequencies has been validated by measurements in a prototype setup. In that way obtained simulation data enabled fast and precise snubbers dimensioning. Application example has illustrated effectiveness of the proposed methodology by line impedance stabilisation network (LISN) spectra evaluation of the experimental flyback converter resulting from snubbers dimensioning.

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Modeling of conducted EMI in flyback switching power converters

Cited by 11 publications

References 16 publications

Analysis, modelling and measurement of the effects of aluminium and polymer heatsinks on conducted electromagnetic compatibility in DC–DC converters

Analysis, modelling and measurement of the effects of aluminium and polymer heatsinks on conducted electromagnetic compatibility in DC–DC converters

Modelling and measurement of high‐frequency conducted electromagnetic interference in DC–DC converters

Electromagnetic interference frequencies prediction model of flyback converter for snubber design

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