Going from 230 V (Europe) to 110 V (US) is not a big problem for a limited time - like 1 minute. See if it works, if it doesn't turn it off quickly. Then get a transformer to go from 110 'v to 230 and plug the laptop to it.

The opposite might fry a laptop though (going from 110 to 230 V). So don't try your laptop in Europe

PS: Brazilian heh ? Same here