Does a PS3 have a universal voltage?

Yes, but I can not speak for ALL PS3s, I own 4 PS3s. Two are the old "fat" one 40g and one 80g both hooked up to voltage converters. The other two are the newer slim 120g, both of which are plugged directly into 220-240v outlets. All four of my PS3s were purchased from the US, and they all say 110v on the back.