You are absolute right about the first part but the second part is not quite right.superczar said:Anyway, a typical home will always have a few bulbs/fans and other non switching supply based devices, so a straight correlation between power consuption and voltage
also, even for your PC, your SMPS would dissipate extra heat so still a correlation between higher voltages and higher power consumption ...
The SMPS works on a PWM principle and therefore, the input current decreases almost as an inverse proportion to the supply voltage, maintaining the input power essentially constant for a given load. The actual variation in input power is caused by two effects; switching and static losses. The two losses move in opposite directions with change in voltage.
Measurements on SMPS I did years ago showed the losses balance each other over almost the entire usable input voltage range. But that was with the half-bridge design common in those days (mid-80s). The losses do go up significantly near the low voltage end for a different reason. That accounted for what we used to call low voltage brown-out in SMPS.
In any case, this entire discussion is purely academic and I don't see it having any bearing on Puns' problem.