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Coupled inductor as common mode choke

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Selvam_Perumal

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Shall I use coupled inductor instead of common mode choke for common mode noise attenuation?
Is there any difference between Coupled inductor and Common mode choke?
 

Re: Coupled inductor as common mode chode

Is there any difference between Coupled inductor and Common mode choke?
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The CMC does not store energy.
 

To be more specific, a CM choke is not designed to store energy. "Coupled inductors" usually are meant for energy storage (flyback converters, etc).
 

Common mode choke is different from coupled inductor

Winding directions are opposite in common mode choke but same direction in coupled inductor

You can convert coupled inductor in to common mode choke by interchanging any one of the winding

Keep in mind that common mode choke will be cheaper than coupled inductor
 

common mode chokes sometimes have a separation between pri and sec......specially if for mains use.

Also, the separation in a "CMC" means pri:sec stray capacitance is low which means noise can't couple between them
 

A common mode choke IS a coupled inductor, the windings are on the same core and the dot notations indicate the phasing, they are designed such that the current from one terminal through will also flow back in the other winding to cancel out the net flux in the core - but the COMMON mode impedance still stands...! i.e. the impedance seen as if both dots were joined and both non dots were joined - however they are usually commercially constructed to have some leakage inductance to give a bit of DM or differential mode impedance, also the self resonant freq of each winding is important as this can be used to filter spikes of frequencies in the same range..
 

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