Author Topic: Winding direction of SMPS output filter inductors?  (Read 583 times)

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Offline MathWizardTopic starter

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Winding direction of SMPS output filter inductors?
« on: July 08, 2021, 06:44:51 pm »
I took apart another computer PSU to measure all the values I could with an LCR meter. But I forgot to check the winding direction for the various output filter inductors, which are un-coupled, single coil inductors. But there's currents going everywhere, magnetic fields going everywhere, so IDK if it matter's or not, if I put them back CW or CCW, relative to each other and any thing else. A couple are close together, but they are all close to other things, and traces and currents going everywhere.

I haven't done near enough physics/math for SMPS analysis with magnetics, besides the most basic. I would assume just have both 12V rail inductors CW or CCW, same for the 2 on the 5Vstby rail, and the 2 on the -12V rail.
 

Offline Benta

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Re: Winding direction of SMPS output filter inductors?
« Reply #1 on: July 08, 2021, 07:38:28 pm »
Erm... a coil has the same winding direction, irrespective of whether they are turned 180 degrees. You know, like a screw thread. Reversing a screw's orientation doesn't change the thread.


 

Offline MathWizardTopic starter

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Re: Winding direction of SMPS output filter inductors?
« Reply #2 on: July 08, 2021, 09:32:43 pm »
Ok good point, and it doesn't flip the z-axis mag field anyways, so just don't put them on the bottom side of the PCB

Now I just need a machine to sort my backwards colored resistors
 
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