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TEC PWM controllers - Page 4

post #31 of 46
Quote:
Originally Posted by Alea iacta est View Post

I mean...if you can list the Y column first and then the X column seperately for each batch..I could plug that into excel and get some simple graphs... you were graphing flow vs temp, yes?
well, it was more like how thick does it get at various temperatures. for example, standard antifreeze at -18C is like 90 weight oil at room temperature, at a 70% antifreeze to 30% water mix, where as the Dex cool at the same temperature of - 18C with the same mixture, was like zoom oil at room temperature. (zoom oil is a really light weight oil almost like water) my final decision was to do a 60% dex cool antifreeze to 40% water as this was even a little more thin.
post #32 of 46
Thread Starter 
Quote:
Originally Posted by toolmaker03 View Post

well, it was more like how thick does it get at various temperatures. for example, standard antifreeze at -18C is like 90 weight oil at room temperature, at a 70% antifreeze to 30% water mix, where as the Dex cool at the same temperature of - 18C with the same mixture, was like zoom oil at room temperature. (zoom oil is a really light weight oil almost like water) my final decision was to do a 60% dex cool antifreeze to 40% water as this was even a little more thin.


what did you use to judge the thickness/viscosity? just like a Popsicle stick or something or did you do the pour point test like they do for diesel fuel? Either way would have been fine, but if that's true, I see how it might not lend itself to a very nice graph.
post #33 of 46
Quote:
Originally Posted by Master Chicken View Post

If I did a small control add-on I would probably use the SiLabs USBee coupled with the TI HDC100 temp and humidity sensor.

I'm just very familiar with the SiLabs 8051 based stuff (originally Cygnal) and have a lot of existing code I could pull from.

Yes, you are correct. You set the Umax on the regulator and feed it a PWM signal on the fan header and it makes the voltage you're looking for by moving between Buck, Buck-Boost, and Boost DC-DC converter modes as the PWM percentage moves. It monitors input voltage, input current, output voltage (obviously) and output current and will fold back if any of these get out of line.

Of course, if you set a Umax to something like 6v, it never leaves the Buck mode.

That is awesome! Can't wait to see some working models.

I have everything I need to install my Thermonamic TEC + foxrena block upgrade except a syringe of CLP and the time to solder on the connector lead...been crazy busy and have one more project I need to finish for a friend before I can go back to it. Once I get it all installed I will definitely be on the lookout for a more robust controller biggrin.gif.
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Behemoth
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post #34 of 46
Quote:
Originally Posted by Master Chicken View Post

I do the schematics in the free ExpressPCB tool but do the layout in Copper Connection. I used to use PADSpcb but the annual maintenance got to be too much for just doing occasional boards. I should probably bite the bullet and move to Eagle CAD but it's hard at first if you have a bunch of custom footprints and schematic symbols in other tools. I SO hate doing footprints.

I will spit out the Gerber files in Copper Connection and send them off to be built by a board house in 5oz, double sided, 62mil, FR-4 material ... probably TG180 due to the heat generated.

wow, that is so cool.
so you design it and subcontract out the build, now that is a professional way of doing it. I have never taken my own projects that seriously, I have always just looked for something that would meet my needs, or something close that would only need minor adjustments to make it work.
post #35 of 46
Quote:
Originally Posted by Alea iacta est View Post

what did you use to judge the thickness/viscosity? just like a Popsicle stick or something or did you do the pour point test like they do for diesel fuel? Either way would have been fine, but if that's true, I see how it might not lend itself to a very nice graph.

yes, I poured the contents of the antifreeze mix from one container into another empty container, and then I did the same thing with different weights of oil like 5 weight, 10 weight, and so on, all the way up to 90 weight oil, until I found a thickness of oil that poured in a similar fashion.
post #36 of 46
Quote:
Originally Posted by toolmaker03 View Post

yes, I poured the contents of the antifreeze mix from one container into another empty container, and then I did the same thing with different weights of oil like 5 weight, 10 weight, and so on, all the way up to 90 weight oil, until I found a thickness of oil that poured in a similar fashion.

I would love to get a hand of your notes and put it in an easy to reference form/chart/graph.

Would save a lot of time and grief - and maybe even a couple pumps and systems - from new builders using the wrong coolant for their goals.
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post #37 of 46
Quote:
Originally Posted by Alea iacta est View Post

Quick question. what Is Umax? it is it the same as Vmax? That's certainly how you seem to be using it.

Yeah, some datasheets use Vmax and some Umax ... same.

I will do at least 5 of the first build and they will go out to people who want to test them out. Most of the cost is actually in the FETs. I'm trying to use the best FETs I can get for the job at hand but the best are expensive. Using the best will keep the efficiency high and hopefully allow me to dissipate the waste heat in this smaller size.
Edited by Master Chicken - 6/23/16 at 6:04pm
post #38 of 46
Thread Starter 
Quote:
Originally Posted by Master Chicken View Post

Yeah, some datasheets use Vmax and some Umax ... same.

I will do at least 5 of the first build and they will go out to people who want to test them out. Most of the cost is actually in the FETs. I'm trying to use the best FETs I can get for the job at hand but the best are expensive. Using the best will keep the efficiency high and hopefully allow me to dissipate the waste heat in this smaller size.

That's fine, I understand the need for doing things in steps. These are also kinda overkill for my smaller TEC's and work out to power an odd number of them based on my current scheme ( I think I can only get 3 per your controller which leaves me 2 shy. The real problem is how many PCIE connectors I have available, (I have 6, and two CPU connecetors) so it would be a little wonky. But otherwise, I'm very interested. If you do another batch would you mind if I message you about it in the future?
post #39 of 46
Aquaero is not capable of humidty sensing (despite it being mentioned in the manual as an option under digital sensors, the humidity sensors even use the same bus as the aquabus but something isn't compatible and it's not capable of computing dew point anyway) after a few PM's with shoggy we worked out it would need to be a special add in board to get it to work with aquaero. Only option is to set a nominal figure below ambient for the controller to hold, risky though as dew point fluctuates so much, would still need insulation for safety. Its perfect if you don;t mind going under dew point in combo with an RSP-xxxx PSU.

So arduino or the USBee thing with a temp, humidity sensor that can do the dew point calculation and ideally has software monitoring and control with that driver board that you are making master chicken would be great. Foxrena has done most of the hard work with arduino control already so if you did the driver and he did the control and you sold it as a package we'd finally have an easy solution like the old arqtik setup.

for $45 it's hard to compete with that tiny controller I have, but no software control or monitoring, and no dew point control. I do my monitoring with XSPC LCD's and aquasuite through sensors on cold, hot, water etc.
post #40 of 46
Quote:
Originally Posted by Alea iacta est View Post

That's fine, I understand the need for doing things in steps. These are also kinda overkill for my smaller TEC's and work out to power an odd number of them based on my current scheme ( I think I can only get 3 per your controller which leaves me 2 shy. The real problem is how many PCIE connectors I have available, (I have 6, and two CPU connecetors) so it would be a little wonky. But otherwise, I'm very interested. If you do another batch would you mind if I message you about it in the future?

Sure. If I do a custom inductor at some point I can probably get to 72 amps on the output instead of the 60 amp limit I have now. Maybe reach 1000 watts instead of the 850 I'm currently targeting.
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