Plugging a simple ac-ac transformer (wall power pack) into an inexpensive UPS
Plugging a simple ac-ac transformer (wall power pack) into an inexpensive UPS
(OP)
A little out of my league here but I would think harmonics would cause the power transformer to heat more and possibly fail prematurely.
The UPS is a simple, personal computer style unit (such as an APS) and is not true sine wave. We are talking maybe 30% distortion.
The power pack is about 2A 120VAC.
The UPS is a simple, personal computer style unit (such as an APS) and is not true sine wave. We are talking maybe 30% distortion.
The power pack is about 2A 120VAC.
RE: Plugging a simple ac-ac transformer (wall power pack) into an inexpensive UPS
The AC resistance of the coil (mostly due to skin effect but also proximity effects) may be a bit higher at the harmonics causing additional winding losses. I doubt this will be particularly significant since the frequencies are probably still quite low. The other source of loss is core loss mainly due to hysteresis loss and eddy current loss. The severity of this loss has a lot to do with the transformer core construction and is to estimate. Again, I suspect the effect might be low.
So to be sure you'd need to carefully inspect the voltage spectrum at the output of the UPS and carefully consider the specifications of the transformer. Or you could just measure it. My hunch is that there would be a small but noticeable difference in heat produced. Curious to know more.
RE: Plugging a simple ac-ac transformer (wall power pack) into an inexpensive UPS