Transcription of UNDERSTANDING AND CONTROLLING COMMON …
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UNDERSTANDING AND CONTROLLING COMMON …
Henry W. OttHOCELECTROMAGNETICCOMPATIBILITY2001 ByHenry W. OttHenry Ott ConsultantsLivingston, NJ 07039(973) AND CONTROLLINGCOMMON-MODE EMISSIONSIN HIGH- power ELECTRONICSPage 1 Henry W. OttHOCELECTROMAGNETICCOMPATIBILITYTHE BASIC PROBLEM!Switching power Supplies and Variable Speed Motor DrivesProduce Large Noise Currents Which are Conducted Out tothe Load, as Well as Conducted Back to The power Source!These COMMON -Mode Noise Currents are the Cause of: Low Frequency Conducted Emission, and High Frequency Radiated Emission!Once One Has an UNDERSTANDING of the Noise Source andCoupling Mechanism, a Solution Can be Determined! power Line Filters in Combination With Proper Load SideFiltering, Grounding, and/or Shielding Will Usually SolveMost COMMON -Mode Emission 22001 Henry W.
©Henry W. Ott HOC ELECTROMAGNETIC COMPATIBILITY THE BASIC PROBLEM! Switching Power Supplies and Variable Speed Motor Drives Produce Large Noise Currents Which are Conducted Out to
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