|> > There are a handful of 12V to 120V AC inverter that uses a low |> > frequency switcher and an iron core transformer, but most of them are |> > two staged high frequency type. The first stage is a DC-DC converter |> > that makes high voltage DC and the second stages chops this into AC. |> >
|> > I've yet to see a computer UPS utilizing the high frequency inverter. |> > Even the very inexpensive ones uses a low frequency switcher and an |> > iron core transformer. |> >
|> > Is there any reason a high frequency inverter couldn't be used? |> |> when you are going to rectify to DC high freq is nice because it is easier |> and cheaper to filter. |> |> when you are going to drive equipment designed for 60 Hz the output needs |> to be 60 Hz. | | The output IS 60Hz either way. | The typical 12V to 120V travel inverter have more steps: | DC 12V --> hundreds of KHz AC-->stepped up to HF AC using light weight | ferrite transformer--->rectified to high voltage DC--->MOSFETs chops | it into 60Hz AC | | The typical UPS inverter: | DC 12V--> chopped into 60Hz AC-->iron core transformer steps it up to | line voltage
You are expected to carry the travel inverter around. This is not commonly done with a UPS. So the weight likely the relevant issue.