Današnja pitanja o pitanjima i odgovorima daju nam zahvaljujući SuperUser, podjela Škole razmjene, zajednice-driven grupiranje Q & A web stranica.
Pitanje
Čitač SuperUser darkAsPitch čudi:
What happens if I do not plug it into the motherboard and it does not have a switch?
I have seen fans before with an “off/low/high” switch that allows you to manually set their speed.
I have seen fans that plug into the motherboard and are controlled by the OS.
I am curious… what does a fan do by default when plugged into a PSU? Does it run at 100% unless otherwise told to go slower? This is what I would expect…
Pa kako oni rade? Pun je rasplodan ako nije naređeno?
Odgovor
Sudionik SuperUser Journeyman Geek nudi sljedeće uvide:
Well, kind of. Fan speed control is done by varying voltage or through Pulse Width Modulation (using a constant voltage and cutting it up into pulses to vary speed). If you’re plugged into a motherboard, that’s what it does. If it has 3 wires, the third wire tells the motherboard what’s the speed the fan is running as. If you have a 4th wire, fan speed control is done via PWM rather than voltage control.
You can plug in a 2 wire fan to a 3 or 4 wire connector (though you lose speed feed back), and a 3 wire to a 4 wire connector (where you lose PWM control). You can also use a fan controller to control speeds.
Else, assuming the power source is unaware it’s a fan (as it would be connected through molex for example), and is at a fixed voltage, yes, it goes at full speed all the time.
Kolega suradnik Hyperslug naglašava kako se izuzimaju iznimke:
Like the other guys said, pretty much yes, but I can think of 3 exceptions:
1. A few fans have a built in thermistor that will adjust speed depending on temperature.
2. PSU’s with specially marked Fan-Only PSU connectors (Antec TruePower 550W) can adjust the speed of the fan:
I tamo ga imate: izvan vanjske kontrole nekim mehanizmom (bilo da je ulazna matična ploča, slučajni termometar ili inteligentni PSU), ventilatori će raditi na najvećoj brzini koju će izvor napajanja omogućiti.
Imate li nešto za objašnjenje? Zvuči u komentarima. Želite li pročitati više odgovora od drugih tehnoloških korisnika Stack Exchangea? Pogledajte ovdje cijelu raspravu.