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Prof. Alireza Khaligh is the Director of the Maryland
Power Electronics Laboratory (MPEL) at the Electrical and
Computer Engineering (ECE) Department and the Institute for
Systems Research (ISR) in the University of Maryland at College
Park (UMCP).
Prof. Khaligh’s major research interests include modeling,
analysis, design, and control of power electronic converters. He
is an author/co-author of more than 130 journal and conference
papers as well as two books including Energy Harvesting: Solar,
Wind, and Ocean Energy Conversion Systems (CRC Press, Dec. 2009), and Integrated
Power Electronics Converters and Digital Control (CRC Press, May 2009).
He is the recipient of various awards and recognitions including the 2015 ISR Junior
Faculty Fellowship from the Institute for Systems Research in UMCP, 2013 George
Corcoran Memorial Award from the ECE Department of UMCP, a three-times recipient
(2015, 2013, 2012) of the Best Vehicular Electronics Awards from IEEE Vehicular
Electronics Society (VTS), 2010 Ralph R. Teetor Educational Award from Society of
Automotive Engineers (SAE), and 2009 Excellence in Teaching Award from IIT.
Prof. Khaligh has had leading positions in many IEEE sponsored conferences. He was the
General Chair of the 2013 IEEE Transportation Electrification Conference and Expo
(ITEC), Dearborn, MI. Prof. Khaligh was the Program Chair of the 2015 IEEE Applied
Power Electronic Conference and Expo (APEC), Charlotte, NC. He was the Assistant
Program Chair of the 2013 APEC, Fort Worth, TX. He was also the Program Chair of the
2011 IEEE Vehicle Power and Propulsion Conference, Chicago, IL and the Program CoChair of the 2012 ITEC as well as the Grants and Awards Chair for the 2012-2013
Prof. Khaligh is an Editor of IEEE Transactions on Vehicular Technology (TVT). He is
an Associate Editor of IEEE Transactions on Transportation Electrification. Prof. Khaligh
was a Guest Editor for the Special Section of IEEE TVT on Sustainable Transportation
Systems, a Guest Associate Editor for the Special Issue of IEEE Transactions on Power
Electronics on Transportation Electrification and Vehicle Systems, a Guest Editor for
Special Section of IEEE TVT on Vehicular Energy Storage Systems and also a Guest
Editor for Special Section of IEEE Transactions on Industrial Electronics on Energy
Harvesting. Prof. Khaligh is a member of the Power Sources Manufacturers Association
(PSMA) University Resources. Prof. Khaligh is a Member of IEEE Power Electronics
Society (PELS), Industry Applications Society (IAS), Industrial Electronics Society
(IES), IEEE Power and Energy Society (PES), and IEEE Education Society.
Prof. Khaligh is the General Chair of the 2016 IEEE Applied Power Electronic
Conference and Expo (APEC), the most Premier Conference in Applied Power
Electronics. He is a Distinguished Lecturer of the IEEE Vehicular Technology Society.
Contact information:
Director of the Maryland Power Electronics Laboratory, University of Maryland, USA
Lecture topics
1. High-efficiency, Isolated Onboard Electric Vehicle Battery Chargers with Ultrawide DC Link Voltage Ranges
In LLC based onboard battery charging architectures used in Plug-in Electric Vehicle
(PEV), the DC link voltage can be actively regulated to follow the battery pack voltage so
that the LLC converter can operate in proximity of resonant frequency and achieve high
efficiencies over the wide range of battery pack voltage. However, conventional boosttype power factor correction (PFC) converters are unable to provide ultra-wide DC link
voltages since their output voltages should always be larger than their input voltages.
This talk proposes various methodologies for onboard PEV charger using boost-type and
single-ended primary-inductor converter (SEPIC) type PFC converters followed by
isolated resonant converters. With the proposed charger architectures, the PFC converter
is able to provide an ultra-wide range for DC link voltage, and consequently enhance the
efficiency of the LLC stage by ensuring operation in proximity of resonant frequency. A
1 kW SiC-based prototype is designed to validate the proposed idea. The experimental
result shows that the proposed converter achieves unity power factor, 2.72% total
harmonic distortion (THD), and 95.3% peak conversion efficiency. The LLC converter
achieves 97.1% peak efficiency and always demonstrates the very high efficiency across
the ultra-wide DC link voltage range. The overall efficiency of the charger is 88.5% to
93.5% from 20% of the rated load to full load.
2. Regulated Transformer Rectifier Units for More Electric Aircrafts
Forthcoming trends in enhancing power quality, power density, and conversion efficiency
of auxiliary power units (APUs) of next generation more-electric-aircrafts (MEA) have
enabled numerous opportunities for advanced power electronic interfaces in avionic
industry. Traditional transformer rectifier units (TRU), designed for APUs in MEA, have
been replaced by actively controlled regulated transformer rectifier units (RTRU) to
remove bulky and heavy low frequency transformer, improve power quality and create a
tightly regulated DC voltage. This talk proposes a novel and computationally-fast control
algorithm, which enables an AC-DC three-phase boost rectifier power factor correction
(PFC) converter in a RTRU, to run at high-end switching frequencies in a DSP-based
digital control platform. The proposed control logic is an alternative to the advanced
modulation strategies like Space Vector Pulse Width Modulation (SVPWM); with an
additional advantage of being significantly less complex and computationally faster in
execution than SVPWM implementation. Thus, it enhances the accuracy of discrete-time
domain controller, improves the power quality and conversion efficiency of the threephase PFC. A 5 kW/10kW continuous power/peak power three-phase boost PFC
prototype is designed and developed to validate the proposed control algorithm. The
experimental results show that an input power factor of 0.999 with conversion efficiency
of 98.2%, THD as low as 4% and a tightly regulated DC link voltage with 1% ripple can
be achieved with the proposed control.
3. Miniaturization of Power Electronic Interfaces for Microrobots
Electroactive polymer (EAP) actuators have been investigated to convert electrical
energy into mechanical deformation in autonomous microrobots. The use of dielectric
EAP actuators comes with several challenges to address requirements such as high
excitation voltages, explicit driving signals, and low conversion efficiency. External
bulky and heavy power sources are used to generate and provide required excitation
voltages. The development of a miniature, high-voltage-gain and highly efficient power
electronic interface (PEI) is required to overcome such challenges and enable
autonomous operation of miniature robots. In this talk, a bidirectional single-stage
resonant dc-dc step-up converter will be introduced which is capable of efficiently
driving high-voltage EAP actuators in mobile microrobots. The converter utilizes
resonant capacitors and a coupled-inductor as a soft-switched LC network to step up low
input voltage. High-frequency soft-switching operation owing to LC resonance allows
small footprint of the circuit without suffering from switching losses, which in turn
increases the efficiency. The circuit is capable of generating explicit high-voltage
actuation signals, with capability of recovering unused energy from EAP actuators. A 4mm × 8-mm, 100-mg and 600-mW prototype has been designed and fabricated to drive
an in-plane gap-closing electrostatic inchworm motor. Experimental validations have
been carried out to verify the circuit’s ability to step up voltage from 2 V to 100 V and
generate two 1-kHz, 100-V driving voltages at 2-nF capacitive loads.