我也一直不解為何 Silk DIY Common Mode Choke N, L 同向繞法，所以有用DASK Filter 2mH 現成Common Mode Choke代替土炮的想法。
從學理來說，Common Mode Choke 繞線應為正反方向：
How do Common Mode Chokes Work?
In normal or differential mode (single choke), current travels on one line in one direction from the source to the load, and in the opposite direction on the return line that completes the circuit. In common mode, the noise current travels on both lines in the same direction.
Common mode chokes have the two or more windings arranged such that the common mode current creates a magnetic field that opposes any increase in common mode current. This is similar to how single line (differential) inductors function. Inductors create magnetic fields that oppose changes in current.
In common mode, the current in a group of lines travels in the same direction so the combined magnetic flux adds to create an opposing field to block the noise, as illustrated by the red and green arrows in the toroid core shown in Figure 1. In differential mode, the current travels in opposite directions and the flux subtracts or cancels out so that the field does not oppose the normal mode signal.
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發表於 2019-8-10 09:56
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