Analysis and practical relevance of CM/DM EMI noise separator characteristics

Schroth, Sebastian; Krismer, Florian; Kolar, Johann W.; Ertl, H.

doi:10.1109/epe.2014.6910867

Cited by 3 publications

(21 citation statements)

References 13 publications

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“…Unfortunately, the circuit suggested by the standard does not have the input impedance necessary for accurate CM and DM noise measurement. The same can be said for many of the noise separators proposed in the literature [5]- [17]. This paper shows what the impedance z-parameters of a single-phase CM/DM separator must be equal to in order to have the input impedances with the appropriate value and independent of the noise voltages and noise source impedances.…”

Section: Introductionmentioning

confidence: 78%

“…Table I shows the impedance z-parameters of all passive and active single-phase noise separators known to the authors. It includes the Δ-network suggested in [4], the passive circuits proposed in [5]- [13], the active noise separators from [16] and [17], and one commercial Δ-network [22]. The HF transformers were assumed to be ideal.…”

Section: Resultsmentioning

confidence: 99%

“…This is why the designer has to find a way to obtain the CM and DM noise content from the unsymmetrical noise voltages. There are many publications suggesting different noise separator circuits that use resistor networks [5], [6], high frequency (HF) transformers [7]- [15], op-amps [16], [17], or current probes [21]. The most natural choice, however, would be to use a CISPR-compliant Δ-type AMN because that is what should be used according to subclause 3.4 in CISPR 16-1-2.…”

Section: Noise Separatorsmentioning

confidence: 99%

“…Only the circuits given in [9], [10], [13], [16], and [17] fulfill the input impedance requirement because they have the impedance parameters given in (A6) in Appendix II. Their practical performance can be objectively assessed from the measurements of their z-parameters, TRs, and RRs.…”

Section: A Theoretical Comparison Of Noise Separatorsmentioning

confidence: 99%

“…This paper shows what the impedance z-parameters of a single-phase CM/DM separator must be equal to in order to have the input impedances with the appropriate value and independent of the noise voltages and noise source impedances. Among the singlephase separators, only the circuits from [9], [10], [13], [16], and [17] have the required z-parameters and would give reliable CM and/or DM results, provided they are properly built and used.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The Input Impedance of Common-Mode and Differential-Mode Noise Separators

Kostov

Schroth

Krismer

et al. 2015

IEEE Trans. on Ind. Applicat.

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This paper discusses the Δ-networks and other circuits designed to separate the conducted electromagnetic interference (EMI) into its common mode (CM) and differential mode (DM) components. The input impedances of CM/DM separators must be 50 Ω resistive in the measurement frequency range, and they must be independent of the values of the noise signals and noise source impedances. The conditions for achieving such input impedances are derived. It is shown that many of the proposed separators, including the Δ-network suggested in the International Special Committee on Radio Interference (CISPR) 16-1-2 standard, do not fulfill the input impedance requirement. This leads to unreliable CM and DM measurements and, consequently, to the oversizing of EMI filters and design by trial and error.Index Terms-Common mode (CM), delta network, differential mode (DM), electromagnetic compatibility (EMC), electromagnetic interference (EMI), International Electrotechnical Commission (IEC), measurement, noise separator, power filters.

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Section: Introductionmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Noise Separatorsmentioning

confidence: 99%

Section: A Theoretical Comparison Of Noise Separatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Input Impedance of Common-Mode and Differential-Mode Noise Separators

Kostov

Schroth

Krismer

et al. 2015

IEEE Trans. on Ind. Applicat.

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The input impedance of common mode and differential mode noise separators

Kostov

Nee

Priecinsky

2013

2013 IEEE Energy Conversion Congress and Exposition

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Analysis and Practical Relevance of CM/DM EMI Noise Separator Characteristics

Krismer

Schroth

Ertl

et al. 2017

IEEE Trans. Power Electron.

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This work investigates sources of measurement errors that result for CM/DM separators in a practical measurement environment, with a particular focus on the recently presented input impedance criterion for CM/DM separators, derives the respective analytical expressions, and employs a detailed analytical model to verify the obtained findings. Furthermore, a method is derived, which determines the worstcase measurement error by reason of cross coupling for given measured DM and CM output voltage components. Based on an example, this work illustrates how the obtained expressions can be advantageously used in a computer program to automatically decide whether a particular spectral measurement component represents a useful measurement result or if it is strongly affected by cross coupling (CM to DM and DM to CM). Finally, the paper presents the realization and accompanying experimental results of an active CM/DM separator, which allows for low realization effort and features competitive separation capabilities (DMTR/CMRR > 50 dB and CMTR/DMRR > 42 dB for frequencies up to 10 MHz). Keywords-Analog processing circuits, electromagnetic compatibility, electromagnetic interference, frequency domain analysis, measurement errors, power electronics, voltage measurement. NOMENCLATUREV rms value of a considered voltage, V = V e jϕ phasor corresponding to a sinusoidal voltage, v(t) = √ 2 V cos(ωt + ϕ), at given angular frequency, ω (alternative time-domain signals are considered by means of Fourier analysis), Z = R + jX complex impedance, V sep,l , V sep,n phasors of the input voltages of the CM/DM separator, V sep,DM , V sep,CM phasors of the DM and CM components corresponding to the separator's input voltages, V out,DM , V out,CM phasors of the output voltages of the separator, DMTR = | V out,DM V sep,DM | Differential Mode Transmission Ratio, CMTR = | V out,CM V sep,CM | Common Mode Transmission Ratio, CMRR = | V out,DM V sep,CM | Common Mode Rejection Ratio, DMRR = | V out,CM V sep,DM | Differential Mode Rejection Ratio, e DM , e CM DM and CM gain errors due to CM/DM separator's input impedances, F. Krismer and J. W. Kolar are with the Power

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Analysis and practical relevance of CM/DM EMI noise separator characteristics

Cited by 3 publications

References 13 publications

The Input Impedance of Common-Mode and Differential-Mode Noise Separators

The Input Impedance of Common-Mode and Differential-Mode Noise Separators

The input impedance of common mode and differential mode noise separators

Analysis and Practical Relevance of CM/DM EMI Noise Separator Characteristics

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