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New simplified model for predicting conducted EMI in DC/DC converters

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Abstract

EMI modeling of power converters is crucial to develop EMI attenuation solutions. Recently, more and more modeling and mathematical analysis of electromagnetic interference (EMI) sources and propagation path had allowed a better understanding of EMI generation mechanism. Calculation times and accuracy determine the efficiency of EMI models in the studied circuit frequency range. In this paper, a priori model (circuit-based model) for predicting the spectra of conducted interferences in a DC/DC converter was developed in the scope of reducing calculation times of temporal simulations. The proposed new approach for high-frequency disturbance estimation is based on the knowledge of circuit parasitic elements and semiconductor devices parameters. A good tradeoff between simulation time and accuracy was registered; this is considered as an interesting step for power converters design.

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Abbreviations

\({C}_\mathrm{p}\) :

The CM propagation path

\({\mathrm{d}I}_\mathrm{F}/{\mathrm{d}t}\) :

Direct current slope

\({\mathrm{d}V}_\mathrm{ds}/{\mathrm{d}t}\) :

MOSFET voltage slope

\({e}_\mathrm{g}\) :

Driving signal

\({I}_\mathrm{F}\) :

Direct current in active devices

\({I}_\mathrm{mos}\) :

MOSFET current

\({t}_\mathrm{fim}\) :

MOSFET current fall time

\({t}_\mathrm{fvd}\) :

Diode voltage fall time during switch on

\({t}_\mathrm{rim}\) :

MOSFET current rise time

\({t}_\mathrm{rvd}\) :

Diode voltage rise time during switch-off phase

\({V}_\mathrm{1}\) :

Voltage across the LISN branch

\({V}_{2}\) :

Voltage across the LISN branch

\({V}_\mathrm{CM}\) :

Common mode noise voltage

\({V}_\mathrm{CM}\_{\mathrm{class}}\) :

Common-mode voltage of the classical model

\({V}_\mathrm{CM}\_{\mathrm{HF}}\) :

Common mode voltage of the turn-off circuits

\({V}_\mathrm{CM}\_{\mathrm{model}}\) :

Common-mode voltage of the complete proposed model

\({V}_\mathrm{d}\) :

Voltage across the diode

\({V}_\mathrm{DM}\) :

Differential-mode noise Voltage

\({V}_\mathrm{DM}\_{\mathrm{class}}\) :

Differential-mode voltage of the classical model

\({V}_\mathrm{DM}\_{\mathrm{HF}}\) :

Differential-mode voltage of the turn-off circuits

\({V}_\mathrm{DM}\_{\mathrm{model}}\) :

Differential-mode voltage of the complete proposed model

\({V}_\mathrm{ds}\) :

Voltage across the MOSFET

\({V}_\mathrm{e}\) :

DC input voltage source

CM:

Common mode

DM:

Differential mode

EMC:

Electromagnetic compatibility

EMI:

Electromagnetic interference

FFT:

Fast Fourier transform

LISN:

Line impedance stabilized network

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Authors and Affiliations

  1. PEG-ENIS, University of Sfax, Sfax, Tunisia

    Leila Fakhfakh & Anis Ammous

  2. DEE, Umm Al Qura University, Makkah, Saudi Arabia

    Anis Ammous

Authors
  1. Leila Fakhfakh
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  2. Anis Ammous
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Correspondence to Leila Fakhfakh.

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Fakhfakh, L., Ammous, A. New simplified model for predicting conducted EMI in DC/DC converters. Electr Eng 99, 1087–1097 (2017). https://doi.org/10.1007/s00202-016-0474-2

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  • DOI: https://doi.org/10.1007/s00202-016-0474-2

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