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Old 09-02-2020, 12:29 PM   #8
PeteS in CA
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Default Re: HiPro HP-P3017F3 rev:03 [Dell H057N] - capacitor repair

Originally Posted by upgradestations View Post
Is the fan controller a software-based controller within the PCB somewhere? It still blows my mind how complex these systems can appear, but really it's just cleverly manipulating the flow of electricity.
In server-grade PSUs fan speed is often controlled by a microcontroller that also controls the output regulation and supervisory functions such as over-current and UVP/OVP protection.

In the case of desktop PSUs such as the one discussed in this thread, fan speed is usually adjusted using a thermistor and opamp to control the DC voltage to the fan.
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