anyone see any high wattage(>75w) PWM fan controllers?

Discussion in 'Electronics' started by Zero_Distortion, Dec 27, 2009.

  1. Zero_Distortion

    Zero_Distortion Gawd

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    frozencpu used to have them, no longer. Would prefer a 3.5" but will settle for a 5.25". no need for a four fan unit as two would be enough.

    This is for a custom application (heated clothing for a motorcycle) which is why it needs to be able to handle a high load.
     
  2. Mohonri

    Mohonri [H]ardness Supreme

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    This might be a good situation to build your own. It's actually quite easy to build a 75W PWM controller, especially for a purely resistive load (which heated motorcycle clothing would be).
     
  3. keenan

    keenan 2[H]4U

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    Yeah, a basic PWM controller is pretty simple to make. A few $0.50 parts are all that's required.

    There are a few other options though, cheap controllers are all over eBay, just search for 'PWM controller' and look at the bare boards available, from about 50W to 1000W should be easy to find. You could take one of the simple potentiometer-controlled PWM circuits out there and build it yourself, such as the one over at Bit Tech (this design may need to be adjusted for ~0-100% output, but it was the simplest I found in a quick search), and modify it slightly for higher power. Add a low Rds-on MOSFET instead of the TIP transistor and possibly a heatsink (do some Pd calculations to be sure) and you should be able to get to a couple hundred watts pretty easily. Or you can just design it yourself from scratch, pretty easy with something as basic as a 555 timer, or any of the hundreds of switch mode controller ICs out there.

    Or you can go completely over the top and get a full microcontroller to run PWM on, and just tack on a low threshold MOSFET or BJT. Add a temperature sensor and you can do full PID control for your heated clothing, doesn't get any more comfortable than that!
     
    Last edited: Dec 29, 2009
  4. Mohonri

    Mohonri [H]ardness Supreme

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    ROFL. Overkill, yes, but I like the way you think! :D
     
  5. Hypernova

    Hypernova [H]ard|Gawd

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    Currently working on a buck converter based 6 channel controller

    You can see the test circuit controlling a 2.9A Delta TFB1212GHE
    [​IMG]

    Still got a lot to do, especially as it appears I can't get the EA-DIP204-4 LCD working. Need to get something UART based.
     
  6. Mohonri

    Mohonri [H]ardness Supreme

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    I love how you have the SPCR forums up in the background when you're running a 3A Delta.
     
  7. Hypernova

    Hypernova [H]ard|Gawd

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    Heh I'm actually silence oriented, my own build uses a triple fan sandwich to get airflow at low rpm
    http://www.hardforum.com/showthread.php?t=1415697

    The only reason I'm trying to build a 0.1~4A (actual limit at 6A for margin) controller is purely for kicks and extra auto control options.
     
  8. Zero_Distortion

    Zero_Distortion Gawd

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    thanks, I ended up throwing a few things together for a few friends bikes. I have a slightly different setup on some of mine. However, now (figures) they have wireless heat controllers! Around a hundred bucks for a dual wireless heat controller. Although the ones on my bikes are permanent mounts, the dual wireless would be nice for a quick connect for borrowed bikes as well as for those bikes I don't normally ride when the temps drop. (No windshields or fairings to block the wind).