Practical characterization of EMI filters replacing CISPR 17 approximate worst case measurements

Kovačević, Ivana F.; Krismer, Florian; Schroth, Sebastian; Kolar, Johann W.

doi:10.1109/compel.2013.6626457

Cited by 6 publications

(6 citation statements)

References 15 publications

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“…Thus, in order to meet the specified requirements, an EMI filter, e.g. designed according to [3], is inserted between the mains connection and the power converter as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

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

Schroth

Krismer

Kolar

et al. 2014

2014 16th European Conference on Power Electronics and Applications

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This Paper details two different contributions related to practical CM/DM EMI measurements. A first part investigates sources and implications 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. Furthermore, the realization of an active CM/DM separator, which features competitive separation capabilities (DMTR/CMRR > 51 dB and CMTR/DMRR > 47 dB for frequencies up to 10 MHz), is presented.

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“…Thus, in order to meet the specified requirements, an EMI filter, e.g. designed according to [3], is inserted between the mains connection and the power converter as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

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

Schroth

Krismer

Kolar

et al. 2014

2014 16th European Conference on Power Electronics and Applications

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“…for Z s,a being considerably different to Z s,b in Fig. 8) serves as a basis for configuring the EMI noise source (from [6], [7]):…”

Section: (B)mentioning

confidence: 99%

“…In (12) the noise source is modeled according to [7], which is based on the EMI noise source model proposed and investigated in [24]. For the derivations of the expressions for V s,DM , V s,CM , Z s,a , Z s,b , and Z s,c , ideal diodes and MOSFET, infinite dc-link capacitance, and operation in the positive mains halfperiod are assumed.…”

Section: (B)mentioning

confidence: 99%

“…With the results obtained from these measurements it is possible to trace reasons for insufficient filter attenuations, cf. [7], inspect the effectiveness of a novel filter topology [8] or design strategy [9] by means of experiments, or specifically verify analytical methods related to investigations of conducted EMI noise, e.g. [ with resistor networks [11], broadband transformers [2], [12]- [14], or power combiners [15].…”

Section: Introductionmentioning

confidence: 99%

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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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“…For instance, the theoretical minimum IL of the filter derived from its network parameters under extreme reference impedances revealed a substantially lower level than the so-called 'approximate worst case' in the CISPR 17 setup, which considers only two scenarios of mismatched load/source impedances (100 Ω/0.1 Ω and 0.1 Ω/100 Ω) [8]. Taking into account the impedance of the EMI source, a more realistic IL was predicted, which, at some frequencies, was smaller than the approximate worst-case estimated by CISPR 17 [9]. Some works are devoted to thorough characterization of filters intended for IL prediction.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Impedance Measurement to Predict Electromagnetic Interference Attenuation Provided by EMI Filters in Systems with AC/DC Converters

et al. 2022

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Due to the widespread integration of renewable energy sources connected to AC and DC power systems by means of power electronics converters, electromagnetic noise propagates along lines, and metallic earth-return structures. EMI filters are commonly used to mitigate the common mode and differential mode noise at the interface of distribution lines, and their suppression characteristics are usually assessed in standard test setups, the impedances of which are, however, scarcely representative of real-world applications. In this paper, an online, inductively coupled impedance measurement method is proposed. A sensitivity analysis to highlight the benefits of the proposed setup and experimental verification is performed. The proposed method enables non-intrusive impedance measurement in energized systems, including power converters. These measures, in turn, allow the evaluation of modal insertion losses of EMI filters in real-world operating conditions. The three-phase example considered in this study shows significant deviations from manufacturer specifications, thus justifying the need for more advanced estimation techniques.

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Practical characterization of EMI filters replacing CISPR 17 approximate worst case measurements

Cited by 6 publications

References 15 publications

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

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

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

Enhanced Impedance Measurement to Predict Electromagnetic Interference Attenuation Provided by EMI Filters in Systems with AC/DC Converters

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