Low cost power lead extended pre-compliance conducted EMI measurement setup and diagnostics with compact LISN

Grobler, I.; Gitau, Michael Njoroge

doi:10.1109/ecce-asia.2013.6579252

Cited by 13 publications

(9 citation statements)

References 9 publications

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“…Above 50 MHz, the accredited measurement shows a lower value, due to the high-power dual LISN at the accredited laboratory that is specified only up to 50 MHz. The laboratory LISN on the other hand, is manufactured for up to 100 MHz [6]. A very good agreement exists between the two measurement techniques confirming that the proposed conducted EMC pre-qualification technique is capable of yielding acceptable results.…”

Section: B Wideband Fft Laboratory Verificationmentioning

confidence: 75%

“…The complete conducted emission SPICE model is created and simulations carried out followed by verifications using practical measurements. A small high-frequency 50 µH/50 Ω ring-core LISN calibrated to 100 MHz [6] and earthed copper sheet bench setup, according to MIL-STD-461F specifications [27], is manufactured and implemented. These are used to verify all simulated data.…”

Section: Measurementsmentioning

confidence: 99%

“…Extending conducted emission tests into the Very High Frequency (VHF) band, up to at least 100 MHz utilising a high frequency Line Impedance Stabilisation Network (LISN) [6], should help reveal possible radiating effects generated by the converter using the conducted emission test. It is a far easier test to perform in the laboratory than radiated testing.…”

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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Section: B Wideband Fft Laboratory Verificationmentioning

confidence: 75%

Section: Measurementsmentioning

confidence: 99%

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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“…Furthermore, common-mode and differential-mode noise signals are digitally separated from the LISN measurements [22]. The thermal image measurements are performed with a Fluke Thermal Imager, model Ti10.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…The effects of polymer heatsinks on common-mode noise is investigated using a MIL-STD-461F based measurement setup. A small high-frequency 50 µH/50Ω ring-core LISN calibrated up to 100 MHz [22] and earthed copper sheet bench setup, according to MIL-STD-461-F specifications [23], are manufactured and implemented to verify all simulated data. Time-domain broadband conducted EMC measurements are recorded with a Tektronix MDO4034B oscilloscope with four 11-bit analogue channels at 2.5 GS/s.…”

Section: Experiments and Resultsmentioning

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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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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Feature Extraction of Conducted Electromagnetic Noise Based on KPCA and Its Application in Main Network

Lü¹,

Huang

Sun

2019

IOP Conf. Ser.: Mater. Sci. Eng.

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In this paper, a new method for conducting EMI noise source identification is proposed. Firstly, the basic principle of the classical KPCA method is analyzed. Then, the core principal component (KPCA) data is selected, and the input space is transformed into the feature space through nonlinear transformation. This method analyzes the relationship between the time and frequency of the electromagnetic interference signal from the frequency domain, so as to extract the time-domain characteristics of the noise signal, and finally diagnose the characteristics that cause the conduction of excessive signal, and according to the characteristics of the noise signal targeted suppression experiment.

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Low cost power lead extended pre-compliance conducted EMI measurement setup and diagnostics with compact LISN

Cited by 13 publications

References 9 publications

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

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

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

Feature Extraction of Conducted Electromagnetic Noise Based on KPCA and Its Application in Main Network

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