The Differential Mode Choke

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Papabravo

Joined Feb 24, 2006
17,296
To answer a question posed by a TS, whose thread was closed for an unidentified reason.

The differential mode choke consists of a pair of inductors with the phase dots out of phase. Like this:

1635177446790.png

The action of a differential mode choke is to attenuate high frequency AC noise on either line, while allowing low frequency and DC current to pass. It's cousin the common mode choke has the phase dots in the same orientation. Like this:

1635177756272.png

The action of the common mode choke is to attenuate high frequency AC signals common to both lines, while allowing low frequency and DC current to pass.

You may find the following YT videos from Robert Bolanos's series on the Analysis & Design of a Flyback Converter useful.


The three together are over an hour, but they are worth it IMHO.
 
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