Seeking help for selecting Ph.D. university

Hello Everyone,

I am a recent graduate (An international student in the USA) and planning to pursue my Doctoral studies after 3 to 5 years(gaining some industrial experience in this time frame). To begin with, what are the criteria that I Should Look for in selecting a university? Also, a list of good universities for power electronics specialization will be a lot helpful.
Thank you for your time and help
I especially enjoyed my time at the University of Illinois with my electrical engineering degree taking me a long way through life.