cupoftea
Advanced Member level 5
Hi,
Why on page 5 do they show the diff mode inductor upstream of the common mode choke?...this is obviously wrong......at least from an EMC point of view, some kind of transient protection feature?
LD AC module
And why on page 4 do they show the Y caps connected to the "less-optimal" side of the common mode choke?
...those y caps on page 4 will fail to offer the emissions the low impedance path to get back into the mains line and neutral...... from the earth surrounding....any emissions going through those y caps would not have gone through both branches of the common mode choke, and so would not be likely to take that particular path anyway....whats the point in a y cap if emissions do not traverse it?
The whole point of a common mode choke is that you give escaping emissions a high impedance path if they dont go through both branches of the common mode choke......thats why the y caps are needed downstream of the common mode choke....because then you are offering the emissions the low impedance path....back through the common mode choke......if the y caps are upstream of the CM Choke.....then you are "shutting the stable door after the horse has bolted."
Why on page 5 do they show the diff mode inductor upstream of the common mode choke?...this is obviously wrong......at least from an EMC point of view, some kind of transient protection feature?
LD AC module
And why on page 4 do they show the Y caps connected to the "less-optimal" side of the common mode choke?
...those y caps on page 4 will fail to offer the emissions the low impedance path to get back into the mains line and neutral...... from the earth surrounding....any emissions going through those y caps would not have gone through both branches of the common mode choke, and so would not be likely to take that particular path anyway....whats the point in a y cap if emissions do not traverse it?
The whole point of a common mode choke is that you give escaping emissions a high impedance path if they dont go through both branches of the common mode choke......thats why the y caps are needed downstream of the common mode choke....because then you are offering the emissions the low impedance path....back through the common mode choke......if the y caps are upstream of the CM Choke.....then you are "shutting the stable door after the horse has bolted."
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