A novel differential mode rejection network for conducted emissions diagnostics

Nave, M.J.

doi:10.1109/nsemc.1989.37184

Cited by 40 publications

(14 citation statements)

References 1 publication

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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: 64%

“…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%

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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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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: 64%

Section: Noise Separatorsmentioning

confidence: 99%

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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“…These separation methods for CM and DM interference have the characteristic of lower cost and are easy to operate. But the junctions between the resistances of differential-mode rejection network (DMRN) [14] and the ports connected to coaxial lines must be manufactured meticulously to conform wide-band response. This is time consuming.…”

Section: Introductionmentioning

confidence: 99%

A Novel Measurement System for the Common-Mode- And Differential-Mode- Conducted Electromagnetic Interference

Feng¹,

Liao²,

Xiong³

2014

PIER Letters

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Abstract-Electromagnetic Interference (EMI) test is an important part for the manufacture of power electronic equipment, which helps us not only analyze the noise characteristics of the Equipment Under Test (EUT) but also design EMI filters. The previous separation method for the Common Mode (CM) and Differential Mode (DM) noise was time consuming or costly. In this paper, a novel measurement system for CM and DM conducted EMI is described showing a good performance. The system consists of two parts, part 1: getting CM noise or DM noise through a current probe; part 2: obtaining another mode noise from a software-based method. A 150 w switch mode power supply is measured to verify the proposed measurement system. The noise spectra of CM and DM signal is shown, and the results obtained by software program are compared with those obtained from a current probe measurement showing a good concordance in terms of peak value.

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“…Separation of conducted emission is a subject which has intrigue authors within the area of power electronics for many years [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11]. Conducted emission can be divided into the categories of CM (Common Mode) and DM (Differential Mode).…”

Section: Introductionmentioning

confidence: 99%

“…Wide-band transformer are found in [9], [2], [3], [4], [12], while a combination of purely resistive networks and transformers are used in [6], [7], [8]. Current probes is another alternative as suggested in [1] and [11], while a software approach is introduced in [10].…”

Section: Introductionmentioning

confidence: 99%

Separation of common and differential mode conducted emission: Power combiner/splitters

Andersen¹,

Nielsen²,

Thomsen³

2012

REPQJ

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Abstract-A conducted emission measurement contains a common and a differential mode component. Accurate separation of these two components is critical, when designing the input filter of a switch mode power supply. Many techniques exists for performing such separation. Some authors suggested the use of wideband transformers, while other prefer current probes. In this paper the use of commercial power splitters/combiners as noise separators are considered. The performance of the noise separators are analyzed and validated based on scattering parameters (S-parameters). Impedance and rejection ratios (common and differential mode) are shown. The results based on S-parameters are used to propose a complete noise separator design. This separator is verified through experimental measurements. Finally an example on how to use the separator, when measuring conducted noise is given.

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A novel differential mode rejection network for conducted emissions diagnostics

Cited by 40 publications

References 1 publication

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

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

A Novel Measurement System for the Common-Mode- And Differential-Mode- Conducted Electromagnetic Interference

Separation of common and differential mode conducted emission: Power combiner/splitters

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