[1] Qiu Xiaohui, Zhao Yang, Xie Shaojun, et al. A novel approach to conductive EMI noise source modeling [J]. Journal of Southeast University (English Edition), 2009, 25 (2): 161-166. [doi:10.3969/j.issn.1003-7985.2009.02.004]

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A novel approach to conductive EMI noise source modeling()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

25

Issue:

2009 2

Page:

161-166

Research Field:

Electrical Engineering

Publishing date:

2009-06-30

Info

Title:

A novel approach to conductive EMI noise source modeling

Author(s):

Qiu Xiaohui¹;  2;  Zhao Yang³;  4;  Xie Shaojun⁵;  Chu Jiamei³;  Jiang Ningqiu⁴

¹ College of Communications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
² School of Information and Electrical Engineering, China University of Mining and Technology, Xuzhou 221008, China
³ State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
⁴ School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing 210042, China
⁵ Defense Science Key Laboratory of Aeronautical Power Supply, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Keywords:

noise source modeling;  impedance estimation;  electromagnetic interference

PACS:

TM461;TN03

DOI:

10.3969/j.issn.1003-7985.2009.02.004

Abstract:

A new approach to conductive electromagnetic interference(EMI)noise source modeling, i.e.the source internal impedance extraction, is presented.First, the impedance magnitude is achieved through an exciting probe and a detecting probe, or through calculations based on insertion loss measurement results when inserting a series high-value known impedance or a shunt low-value known impedance in the circuit.Then the impedance phase is extracted by the Hilbert transform(HT)of the logarithm of the obtained impedance magnitude.Performance studies show that the estimated phase error can increase greatly at a zero frequency in the Hilbert transform because of the existence of a singular point, and this effect can be eliminated by introducing a zero-point when the noise source does not include a series-connected capacitive component.It is also found that when the frequency is higher than 150 kHz, the estimated phase error is not sensitive to the inductive source but sensitive to the capacitive source.Finally, under the conditions of the same measurement accuracies for impedance magnitude, the accuracy of complex impedance based on the HT can be improved about 10 times when compared with the accuracy of estimated parameters based on the impedance magnitude fitting method(IMFM).

References:

[1] Meng J, Ma W M.A new technique for modeling and analysis of mixed-mode conducted EMI noise [J].IEEE Transactions on Power Electronics, 2004, 19(6):1679-1687.
[2] Meng J, Ma W M, Zhang L.Method for analysis and modeling of conducted EMI in switching power converters [J].Proceedings of the CSEE, 2005, 25(5):49-54.(in Chinese)
[3] Ran L, Gokani S, Clare J, et al.Conducted electromagnetic emission in induction motor drive systems, part 1:time domain analysis and identification of dominant modes [J].IEEE Transactions on Power Electronics, 1998, 13(4):757-767.
[4] Ran L, Gokani S, Clare J, et al.Conducted electromagnetic emission in induction motor drive systems, part 2:frequency domain modes [J].IEEE Transactions on Power Electronics, 1998, 13(4):768-776.
[5] Zhu H, Lai J-S, Hefner A R Jr, et al.Modeling-based examination of conducted EMI emissions from hard-and soft-switching PWM inverters [J].IEEE Transactions on Industry Applications, 2001, 37(5):1383-1393.
[6] Qu S, Chen D.Mixed-mode EMI noise and its implications to filter design in offline switching power supplies [J].IEEE Transactions on Power Electronics, 2002, 17(4):502-507.
[7] See K Y, Deng J H.Measurement of noise source impedance of SMPS using a two probes approach [J].IEEE Transactions on Power Electronics, 2004, 19(3):862-868.
[8] Zhang D, Chen D, Nave J M, et al.Measurement of noise source impedance of off-line converters [J].IEEE Transactions on Power Electronics, 2000, 15(5):820-825.
[9] Tesche F M.On the use of Hilbert transform for processing measured CW data [J].IEEE Transactions on EMC, 1992, 34(3):259-266.
[10] Oppenheim A V, Willsky A S.Signals and systems[M].2nd ed.Beijing:Publishing House of Electronic Industry, 2004:351.

Memo

Memo:

Biography: Qiu Xiaohui(1968—), female, associate professor, qiuxh@njupt.edu.cn.
Foundation items: The Natural Science Foundation of Jiangsu Province(No.BK2008429), Open Research Foundation of State Key Laboratory of Millimeter Waves of Southeast University(No.K200603), China Postdoctoral Science Foundation(No.20080431126), Jiangsu Postdoctoral Science Foundation(No.2007-337).
Citation: Qiu Xiaohui, Zhao Yang, Xie Shaojun, et al.A novel approach to conductive EMI noise source modeling[J].Journal of Southeast University(English Edition), 2009, 25(2):161-166.

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