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From: "Bill Sloman"
Subject: Re: Peltier Tempature Controller using a AVR/PIC
Date: Tue, 24 Dec 2002 19:38:25 +0100
Organization: Planet Internet
NNTP-Posting-Date: 24 Dec 2002 18:38:41 GMT
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
"Helmut Sennewald" wrote in message
> "Grahame Kelly" schrieb im Newsbeitrag
> > Hi All.
> > I have a need to build a peltier controller. Reading the source specs it
> > seems that I need to apply a greater than 2Khz signal to power the
> > units as DC will cause thermo stress and lower MTBF.
> Hello Grahame,
> I would say you have interpreted wrong the data sheet.
> I have never heard that peltier coolers are driven with AC-current.
> What should be the advantage of AC current here?
> I am shure they wanted to tell you, that if you drive it with AC current,
> the frequency should be at least 2kHz.
> Can you give a link to that data sheet or send it to me?
> Nowadays there are fully integrated TEC(=Peltier) controllers on the
> They all use PWM with external filters. The PWM frequency is in the range
> of some hundred kHz. The filter is an inductor and a capacitor.
> So they effectively drive with pure DC-current.
> Here are to integrated circuits for Peltier-coolers.
> Linear Technology: LTC1923
> Analog Devices: ADN8830
> It's only for xDSL users, because the this file is over 5MByte.
> MAXIM: Max1978, Max1979
> Microsemi: LX1810
> TI: ?
> Their website is awfully slow today. I gave up.
I wrote up a similar project for Measurement Science and Technology in 1996.
If you have got access to the publishers (the U.K. institute of physics)
web site http://www.iop.org/EJ/S/UNREG/GWzzvSxk9A9WVlbzQZsexg/journal/MST
you could downloaded the 202kbyte .pdf file.
Or you could ask for "A microcontroller-based driver to stabilize the
temeprature of an opticla stage to within 1mK in the range 4-38C, using a
Peltier heat pump and a thermistor sensor" by A W Sloman, Paul Buggs, James
Molloy and Douglas Stewart, published in Meas.Sci.Technol. volume 7, pages
1653-64 (1996) from an academic library near you.
Our paper gives better design equations than the Linear Technology
application note, and spends some time discussing the PWM drive to the
Peltier element and the filtering we used, which turned out to be pretty
E-mail me if you can't get hold of a copy - I've got a few reprints left.
Bill Sloman, Nijmegen
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