proper choke placement

dsavitsk · 11th January 2006, 11:57 PM

Is there anything that a power supply choke should (or should not) be near?

Tweeker · 12th January 2006, 01:16 AM

Chokes, especially ones that are on a choke input LC filter, can radiate EMI just like a transformer.

dsavitsk · 12th January 2006, 01:37 AM

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?

anatech · 12th January 2006, 02:36 AM

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

Tweeker · 12th January 2006, 02:41 AM

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.

Brian Donaldson · 12th January 2006, 02:51 AM

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.

anatech · 12th January 2006, 09:50 PM

Hi Brian,
Thanks, that's what I was getting at.

-Chris

11th January 2006, 11:57 PM	#1
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	proper choke placement Is there anything that a power supply choke should (or should not) be near?

12th January 2006, 01:16 AM	#2
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	Chokes, especially ones that are on a choke input LC filter, can radiate EMI just like a transformer. __________________ Be sure your foil hat has a good low impedance ground.

12th January 2006, 02:41 AM	#5
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	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. __________________ Be sure your foil hat has a good low impedance ground.

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12th January 2006, 01:37 AM	#3
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	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?

12th January 2006, 02:36 AM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

12th January 2006, 02:51 AM	#6
Brian Donaldson diyAudio Member Join Date: Jan 2003 Location: Texas, Love it or leave it	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.

12th January 2006, 09:50 PM	#7
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Brian, Thanks, that's what I was getting at. -Chris

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