03130315| Datasheet

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Chokes for Power Lines Ring Core Chokes with Iron Powder Core
General
Magnetic flux induced in core by operating current

Operating current

Core

Line

Windings through which current flows

Source of interference

Magnetic flux induced in core by interference current

Differential-mode interference current, symmetrical interference

Fig. 1

Ring core choke with powder core Double choke shown as an example

Ring core chokes with iron powder core are primarily used to attenuate differential-mode interference voltages and currents in cases where the use of X capacitors is ineffective, inadequate or undesired. In order to avoid saturation, these chokes are equipped with a closed ring core of iron powder with low permeability. They are often installed together with current-compensated chokes to improve differential-mode interference attenuation, especially at low frequencies. Single chokes with powder core attenuate common-mode and differential-mode RF interference on the connected line. Both windings of double chokes act as if they were connected in series, their effect on differentialmode interference corresponds, in practice, to roughly 3,5 times their rated inductance. Common-mode interference is also attenuated by double chokes with powder core; maximally half the rated inductance of one winding is effective. As with I core chokes the rated inductance is only minimally affected by operating current bias. Due
to the closed core, the stray field, however, is substantially lower than that of a corresponding I core choke.

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