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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: A good question... posted by real_jj on April 24, 2006 at 12:55:46:
Things like switching supplies do all of that and .../...
Not really. The only (switching) power supplies above 50W that are legal (in EU at least) have a PFC in frontstage. The current stay approximatively a sine in quite any load condition. So, strong harmonics in PS will soon be a thing of the past.then stuff the switching frequencies and harmonics back up line if the line filtering isn't good.
You mean if the power supply is correctly designed. Regulations do exist (and well, many of them do exist!) to address the problem of EMI/RFI perturbations and susceptibility. I don't know why you can find on the market pieces of gear that do not comply with the standard. It should not be possible.
A correctly designed switching power supply dont pollute the mains above the standards levels (which not only are rather low, but were tweaked in order that it doesn't bother any other piece of equipement that comply to the susceptbility standards.) So...
But I must admit that designing a switching PS is not really easy. You cannot just trust the controller chip's application notes,where the real application engineer, with his hands-on, is pressurized by the liarmen (marketing) to spray rose water over the hard job of using their product.
You need 3 steps: calculation (yes, real, analytic calculations) then simulation, than build not a mock-up, but a real prototype with a real(expensive) board, well laid-out and estimated. Then compare the three, and hunt the reasons of the difference; Then back again. 2 runs is common. Your boss need to be patient. If he is not, fire him. If you don't dare, let him fire you...
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Follow Ups
- yet a bad answer... - Jacques 14:40:03 04/24/06 (12)
- Sorry, chap, and a right answer. - real_jj 20:32:17 04/24/06 (11)
- Re: Sorry, chap, and a right answer. - Jacques 01:48:08 04/25/06 (10)
- Thanks for a new (to me) word: keraunic - Al Sekela 12:38:30 04/26/06 (2)
- Re: Thanks for a new (to me) word: keraunic - Jacques 03:50:57 04/29/06 (1)
- Re: Thanks for a new (to me) word: keraunic - ernstr@xs4all.nl 06:10:23 05/01/06 (0)
- Thare's a good article by Jim Hagerman here... - andy_c 19:35:24 04/25/06 (5)
- Good article indded, but with some caveats - Jacques 01:26:20 04/26/06 (4)
- Thank you... - real_jj 10:20:35 04/26/06 (3)
- About the very wide load range of PA and switching PS - Jacques 12:42:00 04/26/06 (2)
- Reread and found a typo - Jacques 03:00:14 04/29/06 (1)
- Very minor... - real_jj 12:40:58 04/29/06 (0)
- Why, now there you go - real_jj 03:34:43 04/25/06 (0)
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