- Volume 17 Issue 5
To separate the CM and DM noise in the EMI generated in various electrical electronic systems, passive and active separators have been researched. These separators are an important part of an effective active EMI-filter. The passive separator has some advantages, in that it is easy to realize at a low price and its structure is very simple. However, its major drawback is that its accurate inductor realization and accurate core selection are very difficult. The active separator is smaller in size and more accurate, but its main drawback is that an op-amp which has a broad band frequency response is necessary, its cost is high, and a DC power circuit is required. This paper compares the characteristics of EMI filters which apply the existing passive separator and proposed active separator. It was concluded that an active separator is needed for expensive and accurate equipment, whereas a passive separator is sufficient for inexpensive and general purpose EMI filters.
active noise separator;passive noise separator;CM;DM;EMI-filter
- L. LaWhite and M. Schlecht. Active filters for high frequency power circuits under strict ripple limitations, IEEE PESC Rrc., pp. 255. 1986.
- L. LaWhite, Active filters for 1 MHz power circuits under strict ripple limitation, M.S. thesis, Massachusetts Institute of Technology, 1987.
- LaWhite, Leif E., and Martin F. Schlecht. Design of active ripple filters for power circuits operating in the 1-10 MHz range. Power Electronics Specialists Conference, 1987 IEEE. IEEE, 1987. DOI: http://dx.doi.org/10.1109/63.17949 https://doi.org/10.1109/63.17949
- Son, Yo-Chan, and Seung-Ki Sul. Conducted EMI in PWM inverter for household electric appliance. Industry Applications, IEEE Transactions on 38.5 (2002): pp. 1370-1379. DOI: http://dx.doi.org/10.1109/TIA.2002.802915 https://doi.org/10.1109/TIA.2002.802915
- Yo-Chan Son and Seung-Ki Sul, A Novel Active Common-mode EMI Filter for PWM Inverter, in Conf. Rec. IEEE-APEC, 2002, pp. 545-549. DOI: http://dx.doi.org/10.1109/APEC.2002.989297 https://doi.org/10.1109/APEC.2002.989297
- Paul, Clayton R., and Keith B. Hardin. Diagnosis and reduction of conducted noise emissions, Electromagnetic Compatibility, IEEE Transactions on 30.4 (1988): pp. 553-560. DOI: http://dx.doi.org/10.1109/15.8769 https://doi.org/10.1109/15.8769
- S. Wang, F. C. Lee, and W. G. Odendaal, Characterization, evaluation, and design of noise sepa-rator for conducted EMI noise diagnosis. IEEE Transaction on Power Electronics, vol. 20, no. 4, pp. 974-982, July 2005. DOI: http://dx.doi.org/10.1109/TPEL.2005.850978 https://doi.org/10.1109/TPEL.2005.850978
- A. Nagel and R. W. De Doncker, Separating common mode and differential mode noise in EMI measurements. Proc. of the 8th EPE 1999, Sept. 1999.
- KC CISPR 17 and CISPR 17, Methods of measurement of the suppression characteristics of passive radio interference filters and suppression components, 2007.
- Guo. T, Dan Y. Chen, and Fred C. Lee. Diagnosis of power supply conducted EMI using a noise separator. IEEE APEC Conf. Rec. Vol. 1. 1995. DOI: http://dx.doi.org/10.1109/APEC.1995.469028 https://doi.org/10.1109/APEC.1995.469028
- I. Kovacevic, F. Krismer, S. Schroth, and J. W. Kolar: Practical characterization of EMI filters replacing CISPR 17 approximate worst case measurements, Proc. of the IEEE 14th COMPEL 2013, pp. 1-10. DOI: http://dx.doi.org/10.1109/COMPEL.2013.6626457 https://doi.org/10.1109/COMPEL.2013.6626457