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EMC Engineering: Ferrite Chokes Block Common-Mode Currents and AC Line Cord Emissions



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Ferrite Chokes Block Common-Mode Currents

  • Commonly used on keyboard, mouse or video cables
  • Extremely useful for troubleshooting
  • Manufactures frequently have free evaluation kits
  • Best used on low-impedance cables

AC Line Cord Emissions

  • If AC line cord is suspected of emitting high-frequency harmonics, insert an external line filter in series. If the emission level (or measured common-mode current) drops, then improved line filtering is required.
  • An external filter can be constructed with an extra power line filter module and spare AC line cord.
  • Cut the cord down to minimal size and carefully solder the stripped ends to the filter, observing the correct connections. Wrap with electrical tape.


       

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Updated: Wednesday, 2007-10-03 1:45 PST