This is the USB charger I really like. It has a so call "surge" protecter as you can see . It has a regelated power so if that is even a black out it will off its power input slowly. It is kind of a viceversa thing. 
It is also a 2 port USB charger, for iPhone and iPad. 0.5A and 2.1A. Anyway it does not come cheap. But it is better than damaging my stuff.