No.7（2012）20.Implementing a program for selecting EMI suppression components against conducted noise

Hiroyuki Ohashi

  This study proposes how to effectively select EMC-suppression components against conducted noise.
  The following three items were performed by the authors to focus on conductive noise derived from the primary side of a switching power supply. The first is to study techniques for measuring power line noise. The second is to create computer models of a suppression components selection program. The third is to verify the noise reduction effects of selected parts on conducted noise.
  Comparing measured values with simulated values, we found frequency band widths that have good relations with each type of EMC-suppression component. The next step is to obtain a measurement method and a simulation method for higher frequencies.

Keywords
EMC, Noise reduction technology, Switching power supplies, Conducted emissions

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