Posted by Ekki Kurniawan (33212019) on December 16, 2014 in Uncategorized |


The growth of electronics technology is followed by increasing some kinds of frequency that circulating on the environment. The presence of those frequencies will decrease immunity and reliability of electronic equipments that should be improved by installation of filters. This paper is intended to look for a new filter topology, which is the most efficient from the various possible combinations. The filters installed before the equipments rectification system is called Electromagnetic Interference (EMI) filter. EMI filters are analyzed consists of harmonic filter and Low Pass Broadband Filter (LPBF). Single tone harmonic filter is used to dampen the additional grids frequency that appear ranging from 100 Hz to 2 kHz. LPBF will be combined to dampen the frequencies that higher than 2 kHz due to the effect of capacitance, induction or radiation of electromagnetic pulse from the events of Electrostatic Discharge (ESD), Electrical Fast Transient (EFT) and Surges. Some EMC  standards for transient immunity and harmonic current as set out in the standard IEC 61000-4-2, IEC61000-4-4, IEC 61000-4-5 and IEC 61000-3-2 were elaborated to determine the parameters of the filter. Analysis for the performance of the filter in the form of insertion loss (IL) uses the parameters of impedance,  admittance and transmission in in two port network. The results of calculations based on the standard values ofthe source and load impedance, with a cut-off frequency for harmonic filter is 150 Hz and 6.37 kHz for LPBF  shows that the parallel combination of the type a1 harmonic filter (series with the grid) with LPBF is the most  efficient.

Keywords: electronic equipment, EMC standards, EMI filter, harmonics, LPBF, IL

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