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Medium Voltage Power Electronics Converters and Methods:
Increased efficiency and reliability with reduced footprint
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.
Lead Inventor
Hamid A. Toliyat, Ph.D.
Electrical & Computer
Research Interests
 Power converters for
electric machines including
 Fault tolerant control &
 Magnetic gears & machines
 Fractional Slot Concentrated
Winding (FSCW)
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.
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
 Current shaping at input and output terminals  Lower distortions and THD
 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
 Theoretical concept and simulations testing
 Design and test of various disclosed topologies
Xiaomin Yang, PhD, MBA
Senior Licensing Manager
Texas A&M University
Technology Commercialization
(979) 845-0907
[email protected]
Patent Status
Docket: TAMUS 4320
H. Toliyat, et al, “Ultra-sparse AC-link converters.” IEEE Transactions on Industry Application,
51.1, 2015.
Patent Pending
H. Toliyat, et al, “Sparse AC-link buck-boost 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.