changing DC voltage

[Fritz Oppliger]

I want to regulate a peltier cooler. Manufacturer says they don't like to
be switched on and off alot, they prefer changing input voltage.
On the controller I have available a DAC output 0...2.5 VDC .
What is the most elegant way to turn this into 0...14VDC at 6 amps max?
Thanks-

 

[Bennet Williams]

A power MOSFET circuit would do the job nicely. You may need to drive
the gate via an amplifying transistor (like a simple 2N2222) to get
the voltage range you need.

BRW

On Mon, 23 Aug 2004 15:56:02 -0700, "Fritz Oppliger"
<fritzo_two_@direcway.com> wrote:

I want to regulate a peltier cooler. Manufacturer says they don't like to
be switched on and off alot, they prefer changing input voltage.
On the controller I have available a DAC output 0...2.5 VDC .
What is the most elegant way to turn this into 0...14VDC at 6 amps max?
Thanks-

 

[Andyb]

"Fritz Oppliger" <fritzo_two_@direcway.com> wrote in message
newspsc7jboefkwe1hx@free.teranews.com...

I want to regulate a peltier cooler. Manufacturer says they don't like to
be switched on and off alot, they prefer changing input voltage.
On the controller I have available a DAC output 0...2.5 VDC .
What is the most elegant way to turn this into 0...14VDC at 6 amps max?

I built something to control one of these things a while back. The
manufacturer said that it is okay to use pulse width modulation at
frequencies above 1kHz, so that's what I did and it worked fine! If you
don't get any joy with an analogue solution, you could think along the lines
of 555 - H-Bridge.

Good luck!

Andy

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[Fritz Oppliger]

On Tue, 24 Aug 2004 18:47:00 GMT, Andyb <andrew.blakeney@ntlworld.com>
wrote:

"Fritz Oppliger" <fritzo_two_@direcway.com> wrote in message
newspsc7jboefkwe1hx@free.teranews.com...
I want to regulate a peltier cooler. Manufacturer says they don't like
to
be switched on and off alot, they prefer changing input voltage.
On the controller I have available a DAC output 0...2.5 VDC .
What is the most elegant way to turn this into 0...14VDC at 6 amps max?

I built something to control one of these things a while back. The
manufacturer said that it is okay to use pulse width modulation at
frequencies above 1kHz, so that's what I did and it worked fine! If you
don't get any joy with an analogue solution, you could think along the
lines
of 555 - H-Bridge.

Good luck!

Thanks-

One of my dilemmas is that I have run out of digital output lines but have
these DACs sitting idle.
So I'll try that first.