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Low EMI Noise Power Supplies

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Eric M. Jones

Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts

Posted: Tue Feb 26, 2013 8:00 am Post subject: Low EMI Noise Power Supplies

Here is a dyn-o-mite course on how to make low-noise power supplies. This is not applicable to everyone, but the key point he discusses is that the PCB layout is a key ingredient in making low noise designs. 



http://cds.linear.com/docs/en/application-note/an139f.pdf



Why should you care? Because:



Stopping the EMI after you've caused it is the wrong (expensive!) way to go.

A power supply with noise is usually easier to avoid or replace or redesign than filter and muffle. Making do with any-olde cheapo supply you find on Ebay or Radio Shack will usually turn out to be the most expensive. Remember what Clique and Claque say, "It's the stingey man who pays the most."



do not archive

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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net

nuckolls.bob(at)aeroelect
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Posted: Tue Feb 26, 2013 8:39 am Post subject: Low EMI Noise Power Supplies

At 10:00 AM 2/26/2013, you wrote:

 	  Quote: 	
		  



Here is a dyn-o-mite course on how to make low-noise power supplies. 

This is not applicable to everyone, but the key point he discusses 

is that the PCB layout is a key ingredient in making low noise designs.



http://cds.linear.com/docs/en/application-note/an139f.pdf



Why should you care? Because:



Stopping the EMI after you've caused it is the wrong (expensive!) way to go.


	


    Exactly. HBC sent me to a Kimmle-Gerke seminar

    some years ago.



http://tinyurl.com/b3ojtcp



    Got to spend two days at the feet of Bill Kimmel hisself.

    Most of the class time was expended on chasing horses

    already escaped from the barn . . . because those situations

    predominate in the wild. But a significant effort was

    invested on keeping the barn doors shut tighter in the

    first place. Much of what's offered in the application

    note above was core to Bill's presentation.



    The really cool thing about technology advances are

    higher operating frequencies which give opportunity to

    craft smaller devices (tighter geometry equals smaller

    radiation apertures) and a reduction in the size of

    components needed for attenuating conducted energies.



    These are lessons learned that new kids on the block

    would do well to explore. Unfortunately, much of what

    we're trying to integrate into the uniquely demanding

    arena of airplanes comes from less demanding markets.

    Suppliers of those markets would much rather we did

    not bolt their electro-whizzy to an airplane.

    Increases in sales numbers are trivial and risks rise

    exponentially.



    For years, the best maker of v-belts in the world

    specifically stated in their literature that their

    products were institutionally unapproved for use

    on airplanes . . . while boxes of said belts routinely

    arrived in the warehouses at BePipCesMo.



    It's a crazy world out there . . . and risks

    for escaping gremlins to fiddle with your GPS

    readings are not necessarily consistent with

    either claims or disclaimers in the sales literature!

   Bob . . .

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