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Need advice! 4x0.21A fans on 1amp pr ch controller. (Solved) - Page 5

post #41 of 45
And can you be sure he's right? smile.gif Who knows if he's from marketing I don't know him but.
Thing is you are terribly wrong about "voltage regulators" used in fan controllers. They aren't and there aren't. They're used to chop up the voltage in smaller sections (kind of like PWM but that's done to the voltage not the fan circuitry) BUT NOT TO REGULATE VOLTAGE.
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Ayase Eli
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post #42 of 45
Quote:
Originally Posted by kpoeticg View Post

If you've ever read a review on the Aquaero, it's pretty much mandatory that you buy a waterblock for it if you wanna load up the fan channels. I'm not an engineer. But i know that when you undervolt your fans, you don't wanna have too many on a channel.

The reason for overheating at lower volts is it is going to take so much power at a minimum for the fan to turn. to explain this better I am going to use some figures.

fan uses 12 watts at max speed and work. But the minimum for the fan to run is 3 watts. so 3 watts at 12v is .25 amps. but if you lower the speed and use only 25% of the volts then 3 watts is 1 amp at 4 volts. so yes this is how you can overload a circuit bu running at low RPM.

Actually like you mentioned heat is the problem more than the amount of amps..

Something to remember

in a DC motor or fan

volts = speed
amps = work
a fan or motor will run at a basic minimum amount of power (power is watts) the air and restrictions like a radiator or having to much air in a case ( positive pressure ) can cause a fan to do more work that the minimum.

As long as the fan is turning you will not damage it. by running at a lower speed. (not an exact statement but good enough for these purposes)
Having power going to the fan and it not turning will damage it fast.. that is why when using a speed controller as soon as you see or hear the fan stop either you need to turn it up until fan turns or turn it off..

I may have went in circles but I hope you are able to understand what I am saying.
post #43 of 45
Thank you seross. I have no background in electronics so it can be hard for me to explain things. I get confused between amps/watts/volts. Only thing i use it for is Ohm's law for calculating resistors needed. I wasn't in any way saying it was bad for the fans. I was talking about the heat that gets dissipated through the fan controller +rep

DaveLT, The Aquaero 5 does have VRM's on it. I believe channels 1+2 share one and 3+4 share one. I have spent countless hours researching this particular topic. I just grabbed that quote by doing a 2 second search on this forum when you said no fan controllers have vrm's.
    
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post #44 of 45
Quote:
Originally Posted by kpoeticg View Post

Thank you seross. I have no background in electronics so it can be hard for me to explain things. I get confused between amps/watts/volts. Only thing i use it for is Ohm's law for calculating resistors needed. I wasn't in any way saying it was bad for the fans. I was talking about the heat that gets dissipated through the fan controller +rep

DaveLT, The Aquaero 5 does have VRM's on it. I believe channels 1+2 share one and 3+4 share one. I have spent countless hours researching this particular topic. I just grabbed that quote by doing a 2 second search on this forum when you said no fan controllers have vrm's.

kpoeticg I would not reply or argue with anything DaveLT says because either he dose not know what he is talking about or he does not know how to explain his self..

Also To me with the manual fan controllers I dont know why they dont just use resistors it is more dependable and more robust..
post #45 of 45
Quote:
Originally Posted by seross69 View Post

kpoeticg I would not reply or argue with anything DaveLT says because either he dose not know what he is talking about or he does not know how to explain his self..

Also To me with the manual fan controllers I dont know why they dont just use resistors it is more dependable and more robust..
It would need to be the size of mars then.
Quote:
Originally Posted by kpoeticg View Post

Thank you seross. I have no background in electronics so it can be hard for me to explain things. I get confused between amps/watts/volts. Only thing i use it for is Ohm's law for calculating resistors needed. I wasn't in any way saying it was bad for the fans. I was talking about the heat that gets dissipated through the fan controller +rep

DaveLT, The Aquaero 5 does have VRM's on it. I believe channels 1+2 share one and 3+4 share one. I have spent countless hours researching this particular topic. I just grabbed that quote by doing a 2 second search on this forum when you said no fan controllers have vrm's.
Great to see them filtering the output but my fan controller has 6 independent high side + low side low On Resistance mosfets

Fan controllers only dissipate heat due to switching inefficiency and mosfet losses, they can't possibly use transistors because they would need to heatsink every single part for a mere 0.5amp fan
Transistor voltage loss due to diode drop : 0.7V*0.5 is 350mW but most single bay fan controllers are so packed the only things i know that would handle 350mW dissipation at 35C delta are TO220 transistors

Putting that aside they DO NOT DISSIPATE any other heat than switching inefficiency and mosfet losses. Same way a motherboard VRMs AND PSUs reason why they dissipate heat(they are pretty much the same thing but VRMs are intended FOR CPUs. The alternate word is "PPM" unless they decided otherwise.)

Other than that i shall reiterate that fan controllers "chop up the voltage" but they DO NOT regulate voltage, they certainly don't. The real definition of a VRM is Voltage Regulator Module and voltage regulators are different since voltage regulators are all-in-one devices that take in DC and produce regulated DC that is not filtered. VRMs are power sections on PC motherboards that take in 12VDC that gets chopped up by a controller AND THEN FILTERED FOR CPUs.
So the Aquaero for a lack of better definition have VRMs but they really are just mosfets not controlled by a "power management chip" AFAIK but still VRMs if you google them are for processors

http://en.wikipedia.org/wiki/Voltage_regulator_module

Like i said again, i am instrument engineer, there is no way i don't know what i'm talking about. I research and develop lab power supplies and bench multimeters so yeah ...
Ayase Eli
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Ayase Eli
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