D-ES - current compensated chokes on EE, EF type core.

Current compensated chokes used in input filters

Current compensated chokes used in SMPS power supplies and other electronic devices emitting interference into the power mains. They have very good interference suppression parameters because they are equipped with cores of very high permeability. Due to the bobbin structure it takes very little space on the PCB.

D-ES current compensated chokes
Type Bobbin Core
  D-ES-16/5-H   EF-16/5-K-H-6P-DSformat pdf   EF 16/5
  D-ES-20/6-V   EF-20/6-K-V-6P-DSformat pdf   EF 20/6

  • suppression of interference in electrical equipment
  • suppression of interference in electrical and electronic distribution boards
  • suppression of interference in data transmission cables
  • suppression of interference in electrical control systems for engine-driven mechanical vehicles
  • suppression of interference in ISDN network terminals and broadband ISDN devices with asynchronous data exchange

Due to such arrangement of windings, changes of induction caused by symmetrically operating currents are completely equalized or leveled out. This effect works for high currents, therefore these chokes can be used to suppress interference in electrical equipment causing asymmetric interference. Symmetric voltage interference are suppressed only to some extent.

The risk of over-modulation and reduction of effective core permeability is eliminated by the specific structure of windings and through adequate dimensions of the core designed to match the specific application.

To manufacture cores of current compensated toroidal chokes we use ferrite materials with high initial permeability (mi=4000¸10000).

Depending on the way windings are wound the stray field of these chokes can be maintained on a low level. Chokes with split winding have better winding insulation, but also stronger stray field in comparison with chokes with windings would in the bifilar pattern, whose stray field is reduced to the maximum extent.

see also: DUS, DTS

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