Hello,
I would use the peltier only in cooling mode and a heater foil for heating.
(as you can see in eevblog)
One reason is that you have to switch off the peltier for about 5
minutes to cool down before reversing.
otherwise it works as a generator and possibly may shoot through your
power stage.
The other is that its simpler to control the temperature by a PWM heater
than
with a peltier which needs clean DC voltage for maximum lifetime and
efficiency.
with best regards
Andreas
Am 15.11.2014 um 22:48 schrieb Richard Moore:
Thanks for the replies — I have all I need except an environmental test chamber
to control temp. Of course, right now, I could stick the box outside and drop
its temp by 20C — but I really only need a range of 20C +/- 5C. But as it turns
out, I have a little portable insulated cooler/heater box for holding drinks
and food in the car that has a big reversible Peltier block in it, so maybe I
can finesse this temp testing…
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