Author: rkremserDate: 01:55 02-03-07
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Hello as the topic says i'm looking for a simple design for a 12 to 24 volt
convereter. I have been looking around and realize that there are charge
pumps, transfomer methods and inductor methods to use. When it comes down
to it i need up to .5 amps at the 24 volts and it needs to be reliable and
not sensitive to mechanical vibrations (to be mounted on something similar
to a gocart and run off of the 12 volt system) The smaller the package the
better no more than two cubic inches or so. This will be used to drive two
air solenoid valves for shifting and clutching. Any recomendations are
welcome. I know there are many maxim chips that are very much suitable for
the application but for some reason i feel somewhat hesitant to go the route
of a single IC. thanks in advance
--
Posted via a free Usenet account from http://www.teranews.com
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Author: Homer J SimpsonDate: 20:48 02-03-07
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"rkremser" <rkremser@rkremser.endjunk.com> wrote in message
news:45e7bdc5$0$16409$88260bb3@free.teranews.com...
> Hello as the topic says i'm looking for a simple design for a 12 to 24
> volt convereter. I have been looking around and realize that there are
> charge pumps, transfomer methods and inductor methods to use. When it
> comes down to it i need up to .5 amps at the 24 volts
Then you need to use a transformer - preferably with push pull drive.
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Author: budgieDate: 22:45 02-03-07
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On Fri, 2 Mar 2007 01:55:22 -0500, "rkremser"
<rkremser@rkremser.endjunk.com>
wrote:
>Hello as the topic says i'm looking for a simple design for a 12 to 24 volt
>convereter. I have been looking around and realize that there are charge
>pumps, transfomer methods and inductor methods to use. When it comes down
>to it i need up to .5 amps at the 24 volts and it needs to be reliable and
>not sensitive to mechanical vibrations (to be mounted on something similar
>to a gocart and run off of the 12 volt system) The smaller the package the
>better no more than two cubic inches or so. This will be used to drive two
>air solenoid valves for shifting and clutching. Any recomendations are
>welcome. I know there are many maxim chips that are very much suitable for
>the application but for some reason i feel somewhat hesitant to go the route
>of a single IC. thanks in advance
As your air solenoids presumably wouldn't require a regualted 24V, you may find
this off-the-shelf unit meets your requirements (unless you have compelling
reasons to build your own).
http://www.kemo-electronic.com/en/module/m029/index.htm
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Author: John FieldsDate: 00:22 03-03-07
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On Sat, 03 Mar 2007 01:48:26 GMT, "Homer J Simpson"
<nobody@nowhere.com> wrote:
>
>"rkremser" <rkremser@rkremser.endjunk.com> wrote in message
>news:45e7bdc5$0$16409$88260bb3@free.teranews.com...
>> Hello as the topic says i'm looking for a simple design for a 12 to 24
>> volt convereter. I have been looking around and realize that there are
>> charge pumps, transfomer methods and inductor methods to use. When it
>> comes down to it i need up to .5 amps at the 24 volts
>
>Then you need to use a transformer - preferably with push pull drive.
---
Like you know something about it? "Charge pump" _requires_ a DC
output, so post a schematic instead of just flapping your jaws,
bonehead.
Come to think of it, I don't think I've ever seen you post anything
other than your self-serving run-of-the-mill drivel.
Geez, I wonder why???
Could it be because you're still the same (idiot electrician
licensed in Canada because you managed to bullshit your way through
the test) simple shit who couldn't figure out how to use a current
transformer?
More than likely.
--
JF
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Author: John BarrettDate: 02:15 03-03-07
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"rkremser" <rkremser@rkremser.endjunk.com> wrote in message
news:45e7bdc5$0$16409$88260bb3@free.teranews.com...
> Hello as the topic says i'm looking for a simple design for a 12 to 24
> volt convereter. I have been looking around and realize that there are
> charge pumps, transfomer methods and inductor methods to use. When it
> comes down to it i need up to .5 amps at the 24 volts and it needs to be
> reliable and not sensitive to mechanical vibrations (to be mounted on
> something similar to a gocart and run off of the 12 volt system) The
> smaller the package the better no more than two cubic inches or so. This
> will be used to drive two air solenoid valves for shifting and clutching.
> Any recomendations are welcome. I know there are many maxim chips that
> are very much suitable for the application but for some reason i feel
> somewhat hesitant to go the route of a single IC. thanks in advance
>
>
> --
> Posted via a free Usenet account from http://www.teranews.com
>
I have some 24v hydraulic valves that work just fine at 12v -- so just for
grins -- try tripping the solenoid on 12v -- its just an electromagnet and
may pull suffciently to operate on the lower voltage
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Author: PeterDDate: 09:14 03-03-07
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On Fri, 2 Mar 2007 01:55:22 -0500, "rkremser"
<rkremser@rkremser.endjunk.com> wrote:
> I know there are many maxim chips that are very much suitable for
>the application but for some reason i feel somewhat hesitant to go the route
>of a single IC. thanks in advance
Use the Maxim solutions. THey are the best possible solution. Sure,
you could 'roll your own' with discrete components, but that's the
hard way, will be less reliable, and probably be *much* larger in the
end.
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Author: Ken SmithDate: 10:55 03-03-07
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In article <ok0ju21e7qjqf004fj44tn703eb5jvffol@4ax.com>,
PeterD <peter2@hipson.net> wrote:
>On Fri, 2 Mar 2007 01:55:22 -0500, "rkremser"
><rkremser@rkremser.endjunk.com> wrote:
>
>> I know there are many maxim chips that are very much suitable for
>>the application but for some reason i feel somewhat hesitant to go the route
>>of a single IC. thanks in advance
>
>Use the Maxim solutions. THey are the best possible solution. Sure,
>you could 'roll your own' with discrete components, but that's the
>hard way, will be less reliable, and probably be *much* larger in the
>end.
I assume you work for Maxim.
The OP can get a DC-DC convert from almost anyone else for the job. Look
in Digikey.
--
--
kensmith@rahul.net forging knowledge
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Author: rickmanDate: 12:02 03-03-07
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On Mar 3, 9:14 am, PeterD <pet...@hipson.net> wrote:
> On Fri, 2 Mar 2007 01:55:22 -0500, "rkremser"
>
> <rkrem...@rkremser.endjunk.com> wrote:
> > I know there are many maxim chips that are very much suitable for
> >the application but for some reason i feel somewhat hesitant to go the route
> >of a single IC. thanks in advance
>
> Use the Maxim solutions. THey are the best possible solution. Sure,
> you could 'roll your own' with discrete components, but that's the
> hard way, will be less reliable, and probably be *much* larger in the
> end.
Sure rolling your own may be more work, but I doubt that it will be
any larger and is ,in fact, likely to be smaller. I have done a
number of PS designs and they mostly were smaller than off the shelf
designs, also cheaper. But the work is not trivial, even with a
design example. In automotive apps (not sure how similar go-carts are
to autos in this regard) you need a lot of input protection way beyond
anything you see in other environments. Unless a module is designed
for that it is likely to fail at a high rate. This applies to both
bought modules and self designed ones.
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Author: jasenDate: 16:15 03-03-07
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On 2007-03-03, Homer J Simpson <nobody@nowhere.com> wrote:
>
> "rkremser" <rkremser@rkremser.endjunk.com> wrote in message
> news:45e7bdc5$0$16409$88260bb3@free.teranews.com...
>> Hello as the topic says i'm looking for a simple design for a 12 to 24
>> volt convereter. I have been looking around and realize that there are
>> charge pumps, transfomer methods and inductor methods to use. When it
>> comes down to it i need up to .5 amps at the 24 volts
>
> Then you need to use a transformer - preferably with push pull drive.
huh? a charge pump needs push-pull but no transformer.
and a boost converter needs only a single ended drive on the inductor
--
Bye.
Jasen
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Author: Homer J SimpsonDate: 19:51 03-03-07
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"jasen" <jasen@free.net.nz> wrote in message
news:escohr$fmt$1@jasen.is-a-geek.org...
>> Then you need to use a transformer - preferably with push pull drive.
>
> huh? a charge pump needs push-pull but no transformer.
> and a boost converter needs only a single ended drive on the inductor
for 12 W?
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Author: jasenDate: 03:04 05-03-07
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On 2007-03-04, Homer J Simpson <nobody@nowhere.com> wrote:
>
> "jasen" <jasen@free.net.nz> wrote in message
> news:escohr$fmt$1@jasen.is-a-geek.org...
>
>>> Then you need to use a transformer - preferably with push pull drive.
>>
>> huh? a charge pump needs push-pull but no transformer.
>> and a boost converter needs only a single ended drive on the inductor
>
> for 12 W?
sure.
Bye.
Jasen
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Author: rickmanDate: 09:52 05-03-07
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On Mar 3, 7:51 pm, "Homer J Simpson" <nob...@nowhere.com> wrote:
> "jasen" <j...@free.net.nz> wrote in message
>
> news:escohr$fmt$1@jasen.is-a-geek.org...
>
> >> Then you need to use a transformer - preferably with push pull drive.
>
> > huh? a charge pump needs push-pull but no transformer.
> > and a boost converter needs only a single ended drive on the inductor
>
> for 12 W?
You can use a diode to replace the the other transistor. You actually
don't need a transformer, just a coil. The coil is between the
battery voltage and the load with the diode in series after the coil.
The transistor pulls the coil-diode connection to ground long enough
to put enough current into the coil, then it releases. While the
transistor is turned on, the diode is reverse biased. When the
transistor opens up the coil field collapses and the voltage on it
reverses boosting the output voltage. With this wiring the coil
voltage adds to the battery voltage. A controller modulates the pulse
width of the transistor drive in order to maintain a set output
voltage.
These circuits are not hard to understand, but they are closed loop
feedback controllers and attention must be paid to all the details.
So it would be easier to use one off the shelf or to change the
solenoids to work on a 12 volt drive.
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