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Choke (electronics) - Wikipedia
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Don't see what you're looking for? There was a problem completing your request. Please try your search again later. These are often seen on computer cables. A typical RF choke value could be 2 milli henries. The common-mode choke, where two coils are wound on a single core, is useful for suppression of electromagnetic interference EMI and radio frequency interference RFI from power supply lines and for prevention of malfunctioning of power electronics device. It passes differential currents equal but opposite , while blocking common-mode currents.
Thus, the choke presents little inductance or impedance to DM currents. Normally this also means that the core will not saturate for large DM currents and the maximum current rating is instead determined by the heating effect of the winding resistance.
Product Sheet: Digital Choke Console
The CM currents, however, see a high impedance because of the combined inductance of the positive coupled windings. CM chokes are commonly used in industrial, electrical and telecommunications applications to remove or decrease noise and related electromagnetic interference. When the CM choke is conducting CM current, most of the magnetic flux generated by the windings is confined with the inductor core because of its high permeability. In this case, the leakage flux, which is also the near magnetic field emission of the CM choke is low.
However, the DM current flowing through the windings will generate high emitted near magnetic field since the windings are negative coupled in this case. To reduce the near magnetic field emission, a twisted winding structure can be applied to the CM choke. The difference between the balanced twisted windings CM choke and conventional balanced two winding CM choke is that the windings interact in the center of the core open window. When it is conducting DM current, the equivalent current loops will generate inversed direction magnetic fields in space so that they tend to cancel each other.
We need to conduct a current to the inductor and use a probe to measure the near field emission. Customers who viewed this item also viewed. Don't see what you're looking for? There was a problem completing your request.
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