02-18-2009 10:46 PM
Thank you guys,
I am looking into your suggestions.
Thanks Aaron for taking your time to modifying the program.
Things are working now, am just experimenting with the parameters and such.
Will surely ask if I have questions in this thread.
06-04-2009 07:43 AM
I am also trying to drive a Peltier element using NI modules
I found no driver module that can drive mine, which eats 5V at a maximum of 1.25A.
Any idea of which module can do the trick, NI guys do not manage to find a proper one. Whichoutput module are you ousing to drive the Peltier ?
Álvaro
06-04-2009 10:51 AM
Jean-Marc
07-23-2009 10:14 AM
Interesting ...
I am actually designing a system for the same kind of application: control the temperature of a sensor inside a vacuum thermal chamber.
However, I am not still sure of which is the best way to drive my HEATER (+/5V @ 1.25A). I thought about different solutions:
- PXI 4110 power supply module
- CRIO 9505 motion driver module
- General purpose AO + current amplifier
After your experience, which one would you recommend? My concern is minimizing the amount of external elements in the system.
07-23-2009 11:50 AM
acanivell wrote:Interesting ...
I am actually designing a system for the same kind of application: control the temperature of a sensor inside a vacuum thermal chamber.
However, I am not still sure of which is the best way to drive my HEATER (+/5V @ 1.25A). I thought about different solutions:
- PXI 4110 power supply module
- CRIO 9505 motion driver module
- General purpose AO + current amplifier
After your experience, which one would you recommend? My concern is minimizing the amount of external elements in the system.
I used a big HP power supply and an external relay to flip the polarity controlled via GPIB.
Ben
07-23-2009 06:08 PM
I use two FieldPoint DO channels, one to control a solid-state relay (using software-timed pulse-width modulation) for the power, and the other to set a mechanical relay to switch polarity for heat/cool. Power comes from a standard brick power supply (12V at 6A in my case).
-- James
07-24-2009 02:55 AM
Thanks for the ideas
drjdpowell : I can not though drive the Peltier on PWM, as it would interfere my system readings.
Ben : a HP supply would be nice, but way too big for my system, which is supposed to be portable
So I was just dreaming that I could use the 9505 to drive my heater, but I am not sure I can use he 9505 in DCand that the voltage is reversable.
Otherwise, I think I should go for an AO plus an voltage follower
Any more ideas, suggestions or whatever, very welcome!
07-24-2009 11:06 AM
Oh yeah, I guess a sensor on the peltier would rule out PWM.
There must be a way, though, as I also work with a sensitive CCD camera that uses Peltier cooling that is reasonably small and just runs on a small brick DC power supply.
-- James
05-14-2010 09:17 PM
Hey,
Did you succeed eventually to control your thermocouple, I have the same set up and need help
05-15-2010 06:59 AM
I finally did not implement the thing, as the project was cut down, but I think the way to go is:
- Voltage follower
- Voltage inverter
At the output of a digital output
Hope it helps