@article{rezaei_lee_huang_2016, title={A High-Efficiency Flyback Micro-inverter With a New Adaptive Snubber for Photovoltaic Applications}, volume={31}, ISSN={["1941-0107"]}, DOI={10.1109/tpel.2015.2407405}, abstractNote={Based on the hybrid operation of interleaved flyback micro-inverter in Discontinuous and Boundary Conduction Modes (DCM and BCM), a novel adaptive snubber is proposed in this paper. The proposed snubber limits the drain-to-source voltage overshoot of the flyback's main switch during the turn-off process, enabling the use of lower voltage MOSFETs. It also recovers the stored energy in the leakage inductance of the flyback transformer and provides soft switching for the main flyback switch by limiting the rising slope of the MOSFET voltage during the turn off process resulting in higher efficiency. Exploiting the natural resonant of the flyback converter in BCM the adopted controller provides ZVS and ZCS for the main switch during the BCM operation. The operation of the flyback micro-inverter with associated controllers is analytically studied, and considerations for an optimum design aiming to higher efficiency are presented. Performance of the flyback micro-inverter with the proposed adaptive snubber and the corresponding controllers are experimentally verified based on a 250W interleaved flyback micro-inverter hardware setup.}, number={1}, journal={IEEE TRANSACTIONS ON POWER ELECTRONICS}, author={Rezaei, Mohammad Ali and Lee, Kui-Jun and Huang, Alex Q.}, year={2016}, month={Jan}, pages={318–327} }
 @inproceedings{rezaei_lee_huang_2015, title={A high efficiency flyback micro-inverter with a new adaptive snubber for photovoltaic applications}, DOI={10.1109/ecce.2015.7310126}, abstractNote={Based on the hybrid operation of interleaved flyback micro-inverter in discontinuous and boundary conduction modes (DCM and BCM), a novel adaptive snubber is proposed in this paper. The proposed snubber limits the drain-to-source voltage overshoot of the flyback's main switch during the turn-off process, enabling the use of lower voltage MOSFETs. It also recovers the stored energy in the leakage inductance of the flyback transformer and provides soft switching for the main flyback switch by limiting the rising slope of the MOSFET voltage during the turn-off process resulting in higher efficiency. Exploiting the natural resonant of the flyback converter in BCM, the adopted controller provides ZVS and ZCS for the main switch during the BCM operation. The operation of the flyback micro-inverter with associated controllers is analytically studied, and considerations for an optimum design aiming to higher efficiency are presented. Performance of the flyback micro-inverter with the proposed adaptive snubber and the corresponding controllers is experimentally verified based on a 250W interleaved flyback micro-inverter hardware setup.}, booktitle={2015 ieee energy conversion congress and exposition (ecce)}, author={Rezaei, M. A. and Lee, K. J. and Huang, A. Q.}, year={2015}, pages={3308–3313} }
 @article{rezaei_wang_huang_cheng_palmour_scozzie_2014, title={Static and Dynamic Performance Evaluation of > 13 kV SiC-ETO and Its Application as A Solid-State Circuit Breaker}, volume={778-780}, ISBN={["*****************"]}, ISSN={["0255-5476"]}, DOI={10.4028/www.scientific.net/msf.778-780.1025}, abstractNote={This study addresses the transient and steady-state performance of a >13 kV SiC ETO as a Solid-State Circuit Breaker (SSCB). The developed SiC-ETO is based on a 1 cm2, 15 kV SiC p-GTO with an extremely low differential resistance. Static performance of the device, including the on-state voltage drop at different temperatures and different currents has been carried out in this paper. Furthermore, transient performance of the device, including the turn off energy of the device has been studied. Also, the superior performance of the p-type SiC-ETO has been exploited to design and implement a solid-state circuit breaker. The studies verify the superiority of the SiC p-ETO compared to other solid state devices for this application.}, journal={SILICON CARBIDE AND RELATED MATERIALS 2013, PTS 1 AND 2}, author={Rezaei, Mohammad Ali and Wang, Gangyao and Huang, Alex Q. and Cheng, Lin and Palmour, John W. and Scozzie, Charles}, year={2014}, pages={1025-+} }
 @inproceedings{rezaei_wang_huang_cheng_scozzie_2014, title={Static and dynamic characterization of a > 13kV SiC p-ETO device}, DOI={10.1109/ispsd.2014.6856049}, abstractNote={This study addresses the transient and steady-state performance of a >13 kV SiC p-ETO. The developed SiC p-ETO is based on a 1 cm2, 15 kV SiC p-GTO with an extremely low differential resistance. Static performance of the device, including the on-state voltage drop at different temperatures and different currents is carried out in this paper. Furthermore, transient performance of the device, including the turn off energy and also the Safe Operating Area (SOA) of the device has been studied. Also, the superior performance of the p-type SiC-ETO has been exploited to design and implement a solid-state circuit breaker. The studies verify the superiority of the SiC pETO compared to other solid state devices for this application.}, booktitle={Proceedings of the international symposium on power semiconductor}, author={Rezaei, M. A. and Wang, G. Y. and Huang, A. Q. and Cheng, L. and Scozzie, C.}, year={2014}, pages={354–357} }
 @inproceedings{rezaei_huang_2012, title={Ultra fast protection of radial and looped electric power grid using a novel solid-state protection device}, DOI={10.1109/ecce.2012.6342765}, abstractNote={Exploiting the fast operation of solid-state Fault Isolation Devices (FIDs), this paper presents a novel over-current protection scheme for radial and looped electric power distribution systems. The main feature of the proposed protection scheme is that it ensures the maximum restoration of the system in less than a quarter of the electric cycle. Due to the inherent characteristics of the solid-state devices, the FID is also able to limit the fault current to the maximum allowable fault current level of the system, thus reducing the thermal and mechanical stress on transformers and other power system equipments. Using the inherent characteristics of the solid state devices, a novel fault detection criteria is also proposed that eliminates the necessity of the current sensor or transformer (CT) for detecting the over-current fault. These advantages are all achieved without requiring communication between FIDs. Performance of the FID with the proposed protection scheme is demonstrated based on an all-analog logic-level grid-voltage scale experimental setup. The experiments demonstrate the capability of the proposed protection scheme to fulfill the demands of highly inter-connected electric power distribution systems.}, booktitle={2012 IEEE Energy Conversion Congress and Exposition (ECCE)}, author={Rezaei, M. A. and Huang, A.}, year={2012}, pages={610–614} }