FEATURED Building PWM Controller for 4 wires PWM fan

Arkade · Oct 31, 2013

Hey Jason, Sorry to bug you on this, but how are the production PWM controllers coming along? I'd Love to guinea pig one in my bigger machine, as I have hundereds of different PWM fans, all different freq's and some even reverse pwm, some are picky and don't even work with mobo PWM, but do with a controller O_O

Jasonaaronfox · Oct 31, 2013

Arkade said:
Hey Jason, Sorry to bug you on this, but how are the production PWM controllers coming along? I'd Love to guinea pig one in my bigger machine, as I have hundereds of different PWM fans, all different freq's and some even reverse pwm, some are picky and don't even work with mobo PWM, but do with a controller O_O

Prototype 1 finished, concept proven. Negotiating production numbers with a distributor. Patent pending on my specific code and circuit. Fully isolated from motherboard.

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Arkade · Oct 31, 2013

Oh... this won't help me sadly, I need a 3 Independent channel controller(and adjustable freq). And it has to hold 10 fans(all high amperage, however i could just splice the power to molex)

neonkev · Oct 31, 2013

Jasonaaronfox said:
It was from some obscure data sheet I read for one of their products. Damn thing was half in mandarin.

The regulator you're looking at wastes energy as heat. You need to build a switching regulator for your purposes. A switching regulator doesn't waste energy as heat. The fan is inefficient enough with power as is. The quickest and easiest way is often the wrong way.

I need the unit to be DC powered. Every 48v switching psu I've looked up is AC/DC. Could you refer a unit to me to run off if a 12 volt DC source and be more efficient than what I have?

Arkade · Oct 31, 2013

Joseph Stalin said:
I need the unit to be DC powered. Every 48v switching psu I've looked up is AC/DC. Could you refer a unit to me to run off if a 12 volt DC source and be more efficient than what I have?

eBay

pages.ebay.com

This??

neonkev · Oct 31, 2013

Arkade said:
eBay

pages.ebay.com

This??

That's pretty much what I have now, just without the aluminum housing. Judging by the heatsink-like enclosure I'd imagine this unit gets rather warm as does the boost converter I'm using. Jason was suggesting a switiching psu, which I can infer does not lose copious amounts of energy to heat..

Jasonaaronfox · Oct 31, 2013

Arkade said:
Oh... this won't help me sadly, I need a 3 Independent channel controller(and adjustable freq). And it has to hold 10 fans(all high amperage, however i could just splice the power to molex)

Server rack?

Jasonaaronfox · Oct 31, 2013

Joseph Stalin said:
That's pretty much what I have now, just without the aluminum housing. Judging by the heatsink-like enclosure I'd imagine this unit gets rather warm as does the boost converter I'm using. Jason was suggesting a switiching psu, which I can infer does not lose copious amounts of energy to heat..

You need to build a small circuit with one of these. The data sheet has the instructions for the circuit.

http://www.linear.com/product/LTC3805

Arkade · Oct 31, 2013

Jasonaaronfox said:
Server rack?

No, My Big Rig

Bobnova · Oct 31, 2013

That is a switching regulator, it's a boost regulator. The real question is whether it can put out that many ams with a 12v input.

neonkev · Oct 31, 2013

Bobnova said:
That is a switching regulator, it's a boost regulator. The real question is whether it can put out that many ams with a 12v input.

Yea, it can power the fan at full speed quite effortlessly, drawing about 9.81 amps from the 12 volt supply.

neonkev · Nov 3, 2013

I did it

. Its my first breadboard, so it ain't pretty... but is sure as heck works!

bing · Nov 4, 2013

Joseph Stalin said:
... but is sure as heck works!

Thats the only thing that matter, congrats ! :clap:

Did you try it on your beast THA1248BE ? What a crazy & brute fan you got there. :attn:

Shoot & share the video here when its controlled by that circuit, please.

neonkev · Nov 4, 2013

bing said:
Thats the only thing that matter, congrats !

Did you try it on your beast THA1248BE ? What a crazy & brute fan you got there.

Shoot & share the video here when its controlled by that circuit, please.

No prob, I'll get the video up when I get home from work tomorrow. Thanks for the schematic once again!

neonkev · Nov 4, 2013

Here's the proof

Jasonaaronfox · Nov 4, 2013

neonkev · Nov 4, 2013

Update:

I mounted the controller and 12-48 volt booster in a box, and added an LED power indicator and a small yet powerful 40mm 12v fan to cool the power supply.

Jasonaaronfox · Nov 4, 2013

You seem pretty handy with electronics so far. You should make a microchip based controller for more accurate control signal frequency. It's a super fun project and will teach you a lot.

inVain · Nov 5, 2013

Joseph Stalin said:
Update:

I mounted the controller and 12-48 volt booster in a box, and added an LED power indicator and a small yet powerful 40mm 12v fan to cool the power supply.

you even put a little screamer on the box :clap:

does it another 4 wire fan :drool:

neonkev · Nov 5, 2013

inVain said:
you even put a little screamer on the box

does it another 4 wire fan

It's only a 3 wire fan, but it is a pretty nice quality fan:

This is where I bought the fan from:

http://www.allelectronics.com/make-a-store/item/CF-398/12-VDC-40MM-SQUARE-X-28MM-FAN/1.html

FEATURED Building PWM Controller for 4 wires PWM fan

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