Medium Voltage Power Electronics Converters and Methods: Increased efficiency and reliability with reduced footprint Overview Lead Inventor Hamid A. Toliyat, PhD Electrical & Computer Engineering Research Interests Power converters for electric machines including multilevels Fault tolerant control & detection Magnetic gears & machines Fractional Slot Concentrated Winding (FSCW) Conversion of one form of electric power to another is frequently required in various applications. This conversion often requires an approach with multiple stages, large electrolytic capacitors, and bulky isolation transformers. Multiple power electronic converter topologies (ac-ac, ac-dc, dc-ac, and dc-dc) were developed with a single-stage power conversion system to offer galvanic isolation and soft switching in order to provide greater efficiency and reliability in a much smaller than conventional form-factor. Technology These soft-switching topologies exploit the concept of stacking switch modules so that the converter terminals can accept a high or medium voltage level. The power converters incorporate a high frequency transformer to provide galvanic isolation, the incorporation of a high frequency transformer v. a low frequency transformer reducing space and weight, thereby enabling the converter to be smaller. Benefits Reduced voltage stress Use of faster switching devices High frequency transformer smaller, lighter converters No electrolytic capacitor higher reliability and longevity and smaller size Zero-voltage switching (ZVS) lower dv/dt and EMI, higher efficiency, simpler cooling measures Current shaping at input and output terminals Lower distortions and THD Applications Photovoltaic grid-connected/stand-alone converters, battery chargers, LED lighting systems, light-to-light systems, switch-mode power supplies and UPS, motor and generator drives, interface between ac systems with equal or unequal voltage ratings, HVDC Stage of Development Contact Xiaomin Yang, PhD, MBA Senior Licensing Manager Texas A&M University Technology Commercialization (979)-845-0907 [email protected] Docket: 4320 Theoretical concept and simulations testing Design and test of various disclosed topologies Patent Status Patent Pending Publications H. Toliyat, et al, “Ultra-sparse AC-link converters.” IEEE Transactions on Industry Application, 51.1, 2015. H. Toliyat, et al, “Sparse AC-link buck-booster inverter.” IEEE Transactions on Power Electronics, 29.8, 2014. H. Toliyat, M. Amirabadi, “Sparse parallel partial resonant AC-link converter.” IEEE Applied Power Electronics Conference & Exposition (APEC), 17-21/03/2013.