Some advice wanted please.

Can modern VFD's generate 380v 3 phase from single phase 220v?

I'd assumed that they usually run at the same output voltage as the input so 220v 1ph in and 220v 3ph out, so to run a standard 3ph motor, you have to rewire it from delta to star.

I was looking at some of the VFD's on ebay and came across some that suggest they do some sort of voltage doubling to give 380v 3 phase ouput.

Are the specs bogus?

A 4kw VFD was priced at £170, so more expnsive than the 220v 1ph to 220v 3ph models.