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#1 |
diyAudio Member
Join Date: Oct 2003
Location: Denmark, Viborg
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Whats the current status on SMPS ?
During the last couple of weeks ive read a few comments like "no big deal" and "ive made several that works fine". I need a lot of power, like 40A 12 to 30V. Anybody made something like that that actually works? AND with a reasonable reliability and expected life to it??? Circlotron you mentioned that SMPS is a nogo no matter what, since i know theyre part of your profession, id like to have a short explanation why it is so. Magura
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#2 |
diyAudio Member
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All I've heard is that they are noisy as all hell but nobody's yet given me a reason why this noise can't be filtered, so go for it. I've tried a little work with flyback supplies and have had up to 10W output, I need a larger "spring"...
Tim
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#3 |
diyAudio Member
Join Date: Oct 2003
Location: Denmark, Viborg
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well...monster size inductors are is the smallest problem. I havnt got much clue about the rest, and at 40A this is dangerous i guess
![]() Magura
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#4 |
diyAudio Member
Join Date: Dec 2003
Location: Cold country (Wisconsin)
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I did an off-line, 30V/1kw supply for a customer. It was a 200khz, full bridge forward converter. Full bridge is a bit complicated, but the transformer was so small. I used a small PQ transformer with a center-tapped foil secondary. The primary was wound with triple insulated wire - great for meeting safety requirements. Rubadue, Furukawa and others make this kind of wire.
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#5 |
diyAudio Member
Join Date: Oct 2003
Location: Denmark, Viborg
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Sounds interesting, got schematics for it?
How big is such a thing?....expensive??....reliable?? Magura
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Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com |
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#6 |
diyAudio Member
Join Date: Dec 2003
Location: Cold country (Wisconsin)
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I can get it to you in a few days. Yes, a bit expensive. It was part of a much bigger system: 1kW PFC front end, four independent full bridge outputs (for driving thermo-electric coolers). Basically a big pain in the ***, but also a great learning exerience. Each pice of the system was pretty straight forward, but making them all play together on one board was tough. It did meet class B conducted emissions though.
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#7 |
diyAudio Member
Join Date: Oct 2003
Location: Denmark, Viborg
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what is the expected life of such a monster?
Magura
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Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com |
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#8 |
diyAudio Member
Join Date: Dec 2003
Location: Cold country (Wisconsin)
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I don't know what should 'wear out'. Should last years.
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#9 | |
diyAudio Member
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Quote:
take a look at Application Note 70 on Linear Tech's website -- they have the noise down to where it can be used in hydrophones, medical applications, etc. You can order the parts from Linear directly, they have a low noise gate driver using the same slew-control technology. |
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#10 |
diyAudio Member
Join Date: Oct 2003
Location: Denmark, Viborg
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How about getting +30-0- -30V, is that possible in a reasonable way?
How about an option to regulate the output voltage, lets say from 12V to 30V ? Magura
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