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From: "Helmut Sennewald"
Subject: Re: Peltier Tempature Controller using a AVR/PIC
Date: Tue, 24 Dec 2002 18:25:35 +0100
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
"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 peltier
> units as DC will cause thermo stress and lower MTBF.
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 market.
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
Their website is awfully slow today. I gave up.
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