Originally posted by the-burrito-triangle
View Post
I think the ADC is on the CPU, but don't quote me on that. That'd be the most obvious place, given the intended purpose of allowing the CPU to throttle to avoid overpower trips.
Power factor is very close to 1 at all reasonable loads for anything made since like, 2010, because it's legally required approximately everywhere.
And your "single rail" isn't true--ever. What is true is that modern PSUs use a single AC-to-DC SMPS for the primary 12V output and then _multiple_ DC-to-DC SMPS for the remaining supply voltages (3.3V, 5V, etc.). No matter how you slice the pie, there are multiple "power rails". It's just an argument of topology. Turns out a single AC-DC SMPS for the primary voltage and secondary DC-DC SMPS for the others is more efficient overall.
Check out any integrated graphics OEM desktop from the last 10 years. They all have single-voltage PSUs, and most idle under 10 W.
Leave a comment: