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Smps Toroids on a Ground Plane

D

D from BC

Jan 1, 1970
0
Sorry to have come across this thread late, but what is the "crossover
turn" technique?

I've been trying two methods to minimize susceptibility to axial
fields in Rogowski sensors and tranformers (toroids with non-magnetic
cores):
1) start with a circumferential turn in a groove machined into the
former, then wind on a single layer winding in the opposite direction,
or
2) wind two layers, reversing the feed for the second layer.

Both seem to be OK at reducing axial flux sensitivity, but still
having trouble getting sufficient winding uniformity (another
subject).

But in general, I'd like to know about anything that could raise
self-resonant frequency 2 octaves.

Regards,
Tony

I'm a newbie on this one but here's my explanation on the crossover
technique..

2 ways....

Way 1:
Wind 1/2 the core..then yank that wire back over to the starting
point.
What results is a stupid looking wire that crosses the middle of the
core.
Wind the rest (properly).

Way 2: Have 2 windings on the core. Make the cross connection with a
piece of wire so it's like way 1...(Sorry if that's sounds dopey..)

There were PDF's somewhere along this thread that had drawings that
illustrated the form.

Normally on a fully wound single layer toroid the wire ends meet..(of
course not short out.)
Depending on the cct, there can be a large electric field hot spot...
Arcing at the extreme.
Alternative winding such as the crossover technique reduces the
electric field strength at this spot.
Sometime soon I'll be examining under what conditions the inductor
resonance increases..

As someone mentioned...It's artsy...
D from BC
 
J

John Popelish

Jan 1, 1970
0
D said:
I'm a newbie on this one but here's my explanation on the crossover
technique..

2 ways....

Way 1:
Wind 1/2 the core..then yank that wire back over to the starting
point.
What results is a stupid looking wire that crosses the middle of the
core.
Wind the rest (properly).

Way 2: Have 2 windings on the core. Make the cross connection with a
piece of wire so it's like way 1...(Sorry if that's sounds dopey..)

There were PDF's somewhere along this thread that had drawings that
illustrated the form.

Normally on a fully wound single layer toroid the wire ends meet..(of
course not short out.)
Depending on the cct, there can be a large electric field hot spot...
Arcing at the extreme.
Alternative winding such as the crossover technique reduces the
electric field strength at this spot.
Sometime soon I'll be examining under what conditions the inductor
resonance increases..
Here is the date sheet for commercial toroids wound with a
cross over.
http://www.bourns.com/pdfs/2300_series.pdf
 
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