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 APEC. 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 e-mail: [email protected] 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.