1. Center of Power Electronics Systems, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
2. Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, USA
3. Oak Ridge National Laboratory, Oak Ridge, TN, USA
4. Department of Engineering, University of Cambridge, Cambridge, U.K
5. U.S. Naval Research Laboratory, Washington, DC, USA
6. Department of Electrical and Electronic Engineering, University of Hong Kong, Hong Kong, SAR, China