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24-30v dc power supply schematic

Started by chas October 29, 2012
I need a schematic for a non regulated 24 or 20v dc power supply.
I will be running high amps (15?) for a homebuilt induction furnace.
. . . in advance to one and all. . .thanks. .. chas.


On Sun, 28 Oct 2012 23:44:16 -0600, "chas" <footboarder@bresnan.net>
wrote:

>I need a schematic for a non regulated 24 or 20v dc power supply. >I will be running high amps (15?) for a homebuilt induction furnace. >. . . in advance to one and all. . .thanks. .. chas. >
--- View using a fixed-pitch font: +-[BFD>]----------+-->OUT+ MAINS>-----+ +-+ | BFT | | +-[<BFD]-+--------|-->OUT- \ P||S | | R||E +-[BFC+]-+ I||C | | | | +-[<BFD]-+ | MAINS>-----+ +-+ | +-[BFD>]----------+ BFT: http://www.signaltransformer.com/sites/all/pdf/Rectifiers.pdf BFC: http://www.cde.com/catalogs/CGS.pdf BFD: http://www.vishay.com/docs/88612/gbpc12.pdf -- JF
"John Fields" <jfields@austininstruments.com> wrote in message 
news:2ads88lji0meb9nqrpucig9bh7kbhvpkrb@4ax.com...
> On Sun, 28 Oct 2012 23:44:16 -0600, "chas" <footboarder@bresnan.net> > wrote: > >>I need a schematic for a non regulated 24 or 20v dc power supply. >>I will be running high amps (15?) for a homebuilt induction furnace. >>. . . in advance to one and all. . .thanks. .. chas. >> > > --- > View using a fixed-pitch font: > > > +-[BFD>]----------+-->OUT+ > MAINS>-----+ +-+ | > BFT | | +-[<BFD]-+--------|-->OUT- > \ P||S | | > R||E +-[BFC+]-+ > I||C | | > | | +-[<BFD]-+ | > MAINS>-----+ +-+ | > +-[BFD>]----------+ > > BFT: > http://www.signaltransformer.com/sites/all/pdf/Rectifiers.pdf > > BFC: > http://www.cde.com/catalogs/CGS.pdf > > BFD: > http://www.vishay.com/docs/88612/gbpc12.pdf > > > -- > JF
For high current designs a full wave using a center tap transformer is more efficient, it makes better use of the iron in the transformer and you only have one diode drop. http://www.hammondmfg.com/pdf/5c007.pdf
chas wrote:
> I need a schematic for a non regulated 24 or 20v dc power supply. > I will be running high amps (15?) for a homebuilt induction furnace. > . . . in advance to one and all. . .thanks. .. chas. > >
Let me get this correct here, you'd be happy with a 24V AC or 20v DC supply? Jamie
120 v AC imput and either 24 or 30 v DC output. Need higher output amps for 
the furnace.
******************************************
"Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote in message 
news:sGujs.4256$iq6.3428@newsfe21.iad...
> chas wrote: >> I need a schematic for a non regulated 24 or 20v dc power supply. >> I will be running high amps (15?) for a homebuilt induction furnace. >> . . . in advance to one and all. . .thanks. .. chas. >> >> > > Let me get this correct here, you'd be happy with a 24V AC or > 20v DC supply? > > > Jamie >
I'm at a loss on how to view this.
************************************
"John Fields" <jfields@austininstruments.com> wrote in message 
news:2ads88lji0meb9nqrpucig9bh7kbhvpkrb@4ax.com...
> On Sun, 28 Oct 2012 23:44:16 -0600, "chas" <footboarder@bresnan.net> > wrote: > >>I need a schematic for a non regulated 24 or 20v dc power supply. >>I will be running high amps (15?) for a homebuilt induction furnace. >>. . . in advance to one and all. . .thanks. .. chas. >> > > --- > View using a fixed-pitch font: > > > +-[BFD>]----------+-->OUT+ > MAINS>-----+ +-+ | > BFT | | +-[<BFD]-+--------|-->OUT- > \ P||S | | > R||E +-[BFC+]-+ > I||C | | > | | +-[<BFD]-+ | > MAINS>-----+ +-+ | > +-[BFD>]----------+ > > BFT: > http://www.signaltransformer.com/sites/all/pdf/Rectifiers.pdf > > BFC: > http://www.cde.com/catalogs/CGS.pdf > > BFD: > http://www.vishay.com/docs/88612/gbpc12.pdf > > > -- > JF
On Mon, 29 Oct 2012 09:52:53 -0600, "chas" <footboarder@bresnan.net>
wrote:

>I'm at a loss on how to view this. >************************************
--- Please bottom-post. Fixed-pitch fonts are ones that have equal spacing between characters, like Courier. Variable-pitch fonts are ones that don't have equal spacing between characters, like Times Roman. If you view ASCII art with a variable-pitch font, the result will generally be an unintelligible mess. Also, it's a good idea to start each line of an ASCIImatic with a character other than a space in order to keep some newsreaders from deleting a space if the first character in the line is a space. I forgot to and my drawing got messed up; here's how it's supposed to look: . +-[BFD>]----------+-->OUT+ .MAINS>-----+ +-+ | . BFT | | +-[<BFD]-+--------|-->OUT- . \ P||S | | . R||E +-[BFC+]-+ . I||C | | . | | +-[<BFD]-+ | .MAINS>-----+ +-+ | . +-[BFD>]----------+ -- JF
On Mon, 29 Oct 2012 06:02:18 -0500, "Rick" <rike22@bellsouth.net>
wrote:

> >"John Fields" <jfields@austininstruments.com> wrote in message >news:2ads88lji0meb9nqrpucig9bh7kbhvpkrb@4ax.com... >> On Sun, 28 Oct 2012 23:44:16 -0600, "chas" <footboarder@bresnan.net> >> wrote: >> >>>I need a schematic for a non regulated 24 or 20v dc power supply. >>>I will be running high amps (15?) for a homebuilt induction furnace. >>>. . . in advance to one and all. . .thanks. .. chas. >>> >> >> --- >> View using a fixed-pitch font: >> >> >> +-[BFD>]----------+-->OUT+ >> MAINS>-----+ +-+ | >> BFT | | +-[<BFD]-+--------|-->OUT- >> \ P||S | | >> R||E +-[BFC+]-+ >> I||C | | >> | | +-[<BFD]-+ | >> MAINS>-----+ +-+ | >> +-[BFD>]----------+ >> >> BFT: >> http://www.signaltransformer.com/sites/all/pdf/Rectifiers.pdf >> >> BFC: >> http://www.cde.com/catalogs/CGS.pdf >> >> BFD: >> http://www.vishay.com/docs/88612/gbpc12.pdf >> >> >> -- >> JF > >For high current designs a full wave using a center tap transformer is more >efficient, it makes better use of the iron in the transformer and you only >have one diode drop.
--- I disagree. With a bridge you're using all of the secondary all of the time, while with FWCT you're using half of the secondary half of the time and the other half of the secondary the other half of the time. Also, FWCT takes twice the number of turns on the secondary and the rectifiers have to stand off twice the reverse voltage. -- JF
chas <footboarder@bresnan.net> wrote:
> I need a schematic for a non regulated 24 or 20v dc power supply. > I will be running high amps (15?) for a homebuilt induction furnace. > . . . in advance to one and all. . .thanks. .. chas.
you're going to make an induction furnace, but need help with the brute force power supply? a plain bridge rectifier and some giant caps is probably fine for what you need. something around 20VAC from the transformer will be about right.
"chas"  wrote in message news:TIojs.28$Ns4.1@newsfe09.iad...

> I need a schematic for a non regulated 24 or 20v dc power supply. > I will be running high amps (15?) for a homebuilt induction furnace. > . . . in advance to one and all. . .thanks. .. chas.
Since you only need about 300 watts you might be able to use the 12 VDC = from=20 a couple of old computer power supplies, in series. A 400W supply = usually=20 has 12V at 15 amps or more. You may even be able to hack it to get what = you=20 need with one unit, and if you can use the frequency of the supply for = the=20 induction furnace, you may be able to tap off before the output = rectifier=20 and use it directly on your induction coil. http://www.mpja.com/Dual-250Watt-Reundant-Computer-Power-Supply/productin= fo/17094+PS/=20 (12V 14A, $10) http://www.mpja.com/650Watt-ATX-Echo-Star-Computer-Power-Supply/productin= fo/17980+PS/=20 (12V 22A, $16) You can also get single output switching power supplies for 15 amps or = more: http://www.mpja.com/12V-17A-Phihong-Power-Supply/productinfo/18091+PS/ = ($15) Paul