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Old 12th January 2006, 12:57 AM   #1
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Default proper choke placement

Is there anything that a power supply choke should (or should not) be near?
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Old 12th January 2006, 02:16 AM   #2
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Chokes, especially ones that are on a choke input LC filter, can radiate EMI just like a transformer.
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Old 12th January 2006, 02:37 AM   #3
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Hmmm. It's a CLCRC filter. So should I keep them away from the clean B+? or is it better to keep them away from the power transformers?
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Old 12th January 2006, 03:36 AM   #4
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Rotate the core of the choke 90 from the power transformer core so they don't couple. You can try this before drilling your mounting holes. Treat the choke as if it's a power transformer when laying the circuits out.

-Chris
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Old 12th January 2006, 03:41 AM   #5
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Choke EMI output is a product of the ripple current in the choke, it wont be nearly as much in a capacitor input CLC filter as a choke input LC filter. How much I cant say.

It is also possible for the choke to pick up EMI, how susceptible it is and how much it matters I cant say either, but the above advice is solid.
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Old 12th January 2006, 03:51 AM   #6
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Just rotating may do no good if you're rotating about the pole. Be sure all of the coils (in power, output and chokes) are othogonal if possible so the magentic circuits don't couple.
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Old 12th January 2006, 10:50 PM   #7
anatech is offline anatech  Canada
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Hi Brian,
Thanks, that's what I was getting at.

-Chris
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