How are my computer fans working without a system file controlling it? Or it doesnt have a file controlling the fans?

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dler27

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Jan 28, 2018
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I know how they work. but...
How are computer fans working if they dont have a system file. Or is there a system file for these computer fans function?

But is there something in the disk drive folder like a file that controlls the fans functions??
And if you delete the files that controlls the fans. Will the fans eventually stops working without that computer fan file?
 
Solution
Eximo
If you could delete that part of the BIOS I have a feeling you would have a brick. Easier ways to make a computer stop working.

What are you trying to accomplish? Or are you just trying to understand fan controlling?
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dler27

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Uhm, so if you delete the file or delete all that BIOS thing will the fans stop work?
 
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Eximo

Eximo

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If you could delete that part of the BIOS I have a feeling you would have a brick. Easier ways to make a computer stop working.

What are you trying to accomplish? Or are you just trying to understand fan controlling?
 
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dler27

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Jan 28, 2018
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Yes, im trying to understand the fan controlling so I get more knowledge and stuff and more understanding...
Im not trying to delete anything or so.

 
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Eximo

Eximo

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Here is some reading material then: https://en.wikipedia.org/wiki/Computer_fan_control

Of the mentioned methods, the common ones will be the resistive load, linear voltage control, and PWM.

Resistive loads are putting a potentiometer (variable resistor) in line with the fan. Basically the voltage drop across the resistance is subtracted from the voltage being supplied. This is wasteful, as the excess energy is turned directly into heat.

Linear voltage control is basically have a variable voltage on the fans input. If you send 10 volts it won't spin as fast as at 12v.

PWM (Pulse Width Modulation) is more complicated to explain, but essentially you are sending 12V to a fan which has internal circuitry in the form of the typical coils and some added transistors. Short pulses are sent to the transistors and these allow current to flow, so effectively acting as a valve to control voltage to the fan.

Software interfaces with the firmware which interfaces with the hardware, thus giving you control of the fans from the BIOS, OS, or what have you. I assume the default failure mode of this equipment would be fans to maximum since the other way would lead to disaster.
 
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