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Old 13th April 2003, 07:36 AM   #1
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Default power supply question

Well, after looking around the internet for a couple of hours and getting nowhere, I turn to here

I am looking for a way to generate +/- 15VDC and +/- 42VDC from a car power source (12VDC-15VDC). I found a couple of commercial products that will do this, but my guess is they are switching power supplies which I don't want to use. The purpose of this power supply is for a DAC. Can someone please point me in the right direction in making something along these lines? Thank you very much.
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Old 13th April 2003, 08:32 AM   #2
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Default Re: power supply question

Quote:
Originally posted by Mach_Y
I am looking for a way to generate +/- 15VDC and +/- 42VDC from a car power source (12VDC-15VDC). I found a couple of commercial products that will do this, but my guess is they are switching power supplies which I don't want to use.
That's about the only way you'll be able to get those voltages from a 12-15 volt DC source. You basically have to chop up the DC into AC so you can run it through a step-up transformer and then rectify and filter it from there.

I'm not aware of anything which will directly convert a DC voltage to a higher DC voltage without converting it into AC somwhere in between.

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Old 13th April 2003, 08:43 AM   #3
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If that is the only route, then I'll go that way. I guess I'll just have to use a good deal of buffering / filtering on the power supply. Any ideas on designs for doing the conversion? Thanks again.

Mark
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Old 13th April 2003, 09:52 AM   #4
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hmm, well you could try your local library. the campus libary has about 5 books on switching power supplies.
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Old 13th April 2003, 11:29 AM   #5
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Default DIY Switching?

I can make a microcontroller dance however i want to. If I can find a big fast ( see: expensive ) optocoupler ( i dont even know if they exist... couldnt use use a triac since source isnt AC to start with, right? ) , and use pulse width modulation against some high speed multiple of 60 hz, with two signals becoming something resembling a sine wave, and then throw a whole bunch of capacitors at the result, i get an "AC" signal? Should I filter before or after step up transformer, or do i need to do both?

Ugg. I dont know how to do this in either pure mathematica or pure pspice. i finally understand why matlab might be the better alternative. a pity i never really learned it.

How well does this scale? For high powered and/or truly good quality sound, how good of a substitute is this for a true AC signal? It would be convenient to bypass the gargantuan transformers with some silicon, but i can easily see the added distortion making it not worth it if you have the choice...

New hairbrained plan of the century.

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Old 13th April 2003, 11:38 PM   #6
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Quote:
Originally posted by theChris
hmm, well you could try your local library. the campus libary has about 5 books on switching power supplies.
Great idea.... except that currently I am deployed to a desert. I'll check into it when I get home though.

Oh well... guess I'll just toss out the idea. Maybe I'll order the schematics for some car stereos and see how they do it.
Thanks all for the help.

Mark
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Old 14th April 2003, 12:58 AM   #7
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oh, BTW. i think sound.westhost.com had an article on a scalable switching powersupply that may be relevent.
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Old 14th April 2003, 08:13 AM   #8
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theChris: perfect!! Thanks!
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