Thanks.
Quote:
Originally posted by Geoff
Theres two problems that I see might occur with this, too big of a DT and the rectangular integral method gets inaccurate. Too small of a DT and your program won't crunch the numbers out fast enough.
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I'd guess that with a TEC cooled CPU, a 1KHz sampling rate would give both a small enough dT to give an accurate enough integral, and plenty of time for most microcontrollers you'd want to use to get the calcs done. (I'm assuming the input signal is coming from a sensor on the coldplate and not directly on the CPU. I'm guessing that the copper of the coldplate, 'low pass filters' the fast changes in power dissipation that may be going on in the CPU.) There's a lot to learn in trying to really fine tune a system like this.
I'm looking at getting my employer to buy me an Altera Cyclone FPGA development board that can run a 'soft' 32 bit processor at about 100 MIPS. I don't expect processing power to be an issue. (Major overkill I know, but it would give me a chance to learn the Altera tools and learn my way around the 'soft' processor which we are considering using at work. I'm doing mostly Xilinx development lately.)