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Here is what I get from your 'teaching'.

Hi.

Great artworks, no double. But these artworks with your explanation lead me the impression this is a general description of winding capacitance in general, subject to verification. The last drawing on layered winding already confirm very clearly this is a coil or transformer winding distributed capacitance rather than CM chokes which you insist it is for.

You would have got full marks from me if you simply told me this is a general description of a coil & multi-layerd winding of a transformer. But you still insist that these are for CM chokes which, IMO, are not.

If this is what you know about CM chokes, may I suggest you to read more relevant theories on coil & winding capacitance. I quoted you my source of my posts & you can't come up from any substantiation on your drawings. Someone just quoted my posts as "wild claims" despite I already quoted the texts I borrowed from (for whatever motive is so apparent). Your drawings without source of references can hardly be convincing as I found them so confusing when applied to a CM choke.

My expected answer from you for my quiz: why "TWO" coils are used in typically designed CM chokes is simply the basic principle how a CM choke works, & I am so surprised you can't even tell us this. You really let me down despite the long years knowlege/experience you claim to possess.

Why two coils? These coils are of identical built so that both have identical inductance. When the common mode signal passes through the coils via the load, the inductance of the first coil on L line, being equal & opposite to that of the second coil on the N line, is cancelled out completely. So the common mode signal can pass through the load without any AC resistance as the inductance in the L & N lines are cancelled. The way the coils are built typically with only a few turns loosely wound is to yield minimum DCR & distributed capacitance to the common mode signal. So minium loss or resistance to the common mode signals to & from the load.

But for the common mode noises, the situation is just opposite. Since only the common mode noise signal generated to the L line goes through the coil on L line while the common mode noise generated on the N line passing through the CM choke coil on N line will be drained off via the load grounding circuit, so no cancellation of inductance can be effected & the common mode noises on both the L & N lines face large inductive reactance in the CM chokes, which subtantially reduces or effectively eliminated.

c-J


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