A Method-of-Moments Model for Determination of Radiated Magnetic Field from Switch-Mode Power Supplies Components using Near-Field Measurement Data
Keywords:
Electromagnetic compatibility, method-of-moments, near-field measurement, switch-mode power supplyAbstract
Electromagnetic interference due to switching-mode power supplies (SMPSs) is a great concern for the designers of electrical and electronic equipment. In this paper, we propose a method-of-moments model for efficient determination of radiated magnetic field due to SMPSs mounted on printed circuit boards (PCBs). This model involves three stages. First, the magnetic field distribution on a given rectangular plan in the vicinity of the board is measured. The measured data are then used to identify the equivalent source currents on the surface of the radiating board by the method-of-moments. Having determined the radiating sources, the magnetic field distribution at a desired distance from the PCB can be computed. The main feature of the proposed model is its direct approach for reconstruction of the radiating current sources, which makes it much faster than the conventional techniques, involving heuristic optimization algorithms. The validity of the proposed technique is demonstrated by comparing the actual and predicted far-field magnetic field radiations due to a small electrical loop, a high frequency inductor as a typical radiating magnetic field component of SMPSs, and a microstrip transmission line, which simulating conduction paths on the PCB.
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References
G. Antonini, S. Cristina, and A. Orlandi, “EMC characterization of SMPS device circuit and radiated emission model,” IEEE Trans. Electromagn. Compat., vol. 38, no. 3, pp. 300-309, 1996.
A. M. Sitzia, A. E. Baker, T. W. Preston, A. Puzo, and A. Pons, “Finite element analysis for power electronics EMC applications,” IEEE Trans. Magn., vol. 32, no. 3, pp. 1517-1520, 1996.
N. J. Ryan, B. Chambers, and D. A. Stone, “FDTD modeling of heat sink RF characteristics for EMC mitigation,” IEEE Trans. Electromagn. Compat., vol. 44, no. 3, pp. 458-465, Aug. 2002.
M. M. Hernando, A. Fernandez, M. Arias, M. Rodriguez, Y. Alvarez, and F. Las-Heras, “EMI radiated noise measurement system using the source reconstruction technique,” IEEE Trans. Ind. Electron., vol. 55, no. 9, pp. 3258-3265, 2008.
L. Beghou, B. Liu, L. Pichon, and F. Costa, “Synthesis of equivalent 3-D models from near field measurements-application to the EMC of power printed circuit boards,” IEEE Trans. Magn., vol. 45, no. 3, pp. 1650-1653, Mar. 2009.
M. Barzegaran and O. Mohammed, “Near field evaluation of electromagnetic signatures from wound rotor synchronous generators using wire modeling by finite elements,” 28th Annual Review of Progress in Applied Computational Electromagnetics (ACES), pp. 774-779, Columbus, Ohio, April 2012.
A. Nejadpak, M. R. Barzegaran, and O. A. Mohammed, “Evaluation of high frequency electromagnetic behavior of planar inductor designs for resonant circuits in switching power converters,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 26, no. 9, pp. 737-748, September 2011.
K. Mainali and R. Oruganti, “Conducted EMI mitigation techniques for switch-mode power converters: A survey,” IEEE Trans. Power Electron., vol. 25, no. 9, pp. 2344 -2356, 2010.
S. M. M. Mirtalaei, S. H. H. Sadeghi, and R. Moini, “Modeling the electric field emission of switch mode Power supplies using magnetic nearfield measurement and method of moments,” Journal of Basic and Applied Science (JBASR), vol. 3, no. 2, pp. 597-602, February 2013.
S. M. M. Mirtalaei, S. H. H. Sadeghi, and R. Moini, “Radiated emission determination from near field measurements for EMI evaluation of switch mode power supplies components by method of moments,” Power Electronics, Drive Systems and Technologies Conference (PEDSTC), pp. 421-425, Tehran, Iran, February 2013.
S. M. M. Mirtalaei, S. H. H. Sadeghi, and R. Moini, “A combined method-of-moments and near field measurements for EMI evaluation of switchmode power supplies,” Accepted for Publication in IEEE Trans. Ind. Electron, 2013.
R. F. Harrington, Time-Harmonic Electromagnetic Fields, McGraw-Hill, New York, 1961.
Y. A. Lopez, F. L. Andrs, M. R. Pino, and T. K. Sarkar, “An improved super-resolution source reconstruction method,” IEEE Trans. Instrum. and Meas., vol. 58, no. 11, pp. 3855-3866, 2009.
A. Balanis, Antenna Theory: Analysis and Design, John Wiley & Sons, 2005.
Roger F. Harrington, Field Computation by Moment Methods, Macmillan, 1968.
C. Paige and M. A. Saunders, “LSQR: An algorithm for sparse linear equations and sparse least squares,” ACM Trans. Math. Soft., vol. 8, pp. 43-71, 1981.
K. Srinivasan, H. Sasaki, M. Swaminathan, and R. Tummala , “Calibration of near field measurements using microstrip line for noise predictions,” Proceedings of 54th Electronic Components and Technology Conference, 2004.
