Täna, see küsimuste ja vastuste seanss tuleb meile viisakalt Super-kasutaja, Stowe Exchange'i alamrubriigist, Q & A veebisaitide kogukonnapõhiseks rühmituseks.
Küsimus
SuperUser lugeja darkAsPitch imestab:
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…
Kuidas nad siis töötavad? Täielik, kui pole teisiti käskinud?
Vastus
SuperUseri toetaja Journeyman Geek pakub järgmist teavet:
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.
Teine kaasautor Hyperslug rõhutab, kuidas erandid mängivad:
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:
Ja seal on see: välise kontrolli all mõne mehhanismiga (olgu see siis emaplaadi sisend, juhtmõõtur või intelligentne toiteallikas), töötavad ventilaatorid maksimaalse kiirusega, mida toiteallikas võimaldab.
Kas teil on seletamiseks midagi lisada? Helistage kommentaarides. Kas soovite lugeda rohkem vastuseid teistelt tech-savvy Stack Exchange'i kasutajatelt? Tutvu täieliku arutelu teemaga siit.