Article
Computer Science, Information Systems
Behnam Koushki, Praveen Jain, Alireza Bakhshai
Summary: A new topology and controller for bi-directional EV battery chargers based on single-stage AC-DC resonant converter is proposed. The topology is a Half-Bridge (HB)-Full-Bridge (FB) resonant converter with MOSFET's connected in series and in opposite direction, and an active filter on the DC-side. The use of an appropriate control scheme enables a wide range of power control under different voltage levels, and the absence of electrolytic capacitors increases the reliability of the converter. The controller allows Zero Voltage Switching (ZVS) for all switching instances, reducing conduction losses and improving efficiency, while the active filter absorbs low frequency current ripple to prevent it from affecting the battery and increasing its lifespan.
Article
Automation & Control Systems
Amin Ashraf Gandomi, Leila Parsa, Keith A. Corzine
Summary: This article proposes a bidirectional isolated dc-dc converter for shipboard power systems. It utilizes an active 5-level T-type converter and a high-frequency transformer. The converter is optimized to minimize power losses by considering transformer core loss, reactive power, and rms current. Wide band gap devices are used to minimize switching losses. A control method based on Fourier series and decomposition theorem is proposed. The converter features higher efficiency, fault tolerance, and smaller filter size compared to common dual active bridge converters. Experimental results verify its step-up and step-down operations.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Yimin Lu, Xuefei Wei, Xianfeng Huang, Zhihong Yin
Summary: This article investigates the dynamics of a power electronic circuit, specifically the PI control system of an LLC resonant dc-dc converter, by establishing an equivalent memristor model for the system. The study utilizes mathematical methods such as Floquet theory, bifurcation diagrams, and Poincare maps to analyze the system's behavior. The results confirm the presence of various nonlinear phenomena and increased uncertainty in the system due to changes in parameters. Understanding the dynamical characteristics of power electronics systems from the perspective of transient transition and multistability is crucial for ensuring safe and reliable operation.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Multidisciplinary
Shuang Zhao, Asantha Kempitiya, Wibawa T. Chou, Veljko Palija, Carl Bonfiglio
Summary: The article demonstrates the design process of a high-frequency wide-range LLC resonant dc/dc converter using wide bandgap power devices. Variable dc-link voltage control is used to increase the operation range, and a power loss model based on characterization results is presented and validated. The experimental prototype verifies the proposed design process and shows that variable dc-link voltage control can increase the power efficiency of the LLC converter throughout the operation range.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2022)
Article
Computer Science, Information Systems
Hussein Mahdi, Ahmed M. Ammar, Yasser Nour, Michael A. E. Andersen
Summary: This paper investigates the use of the class-E inverter for power factor correction (PFC) applications, presenting a converter design capable of achieving inherent PFC operation. Experimental results demonstrate that the design performs well at different output powers, with high efficiency and low total harmonic distortion (THD).
Article
Automation & Control Systems
Pawel Gorecki, Daniel Wojciechowski
Summary: This article presents a novel and improved method for computing the IGBT junction temperature in PLECS simulation software. The method aims to improve accuracy by using a more sophisticated model of transistor losses and accounting for the variability of transistor thermal resistance with temperature. The proposed method is experimentally verified for a dc-dc boost converter, and any discrepancies between simulations and measurements are discussed. It is well-suited for accurate electrothermal circuit-level simulations of power electronics converters.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Suhua Luo, Fengjiang Wu, Guizhong Wang
Summary: In this article, a novel topology with a three-level half-bridge matrix converter and a resonant tank is proposed to improve the current characteristics of the single-stage dual active bridge type isolated ac-dc converter. The operation principle and steady-state characteristics are analyzed based on PWM plus phase shift modulation. The proposed converter reduces voltage stress and current stress on power switches, and is valuable in medium-voltage applications for high-frequency power conversion. Detailed experimental results verify the correctness and feasibility of the proposed topology and theoretical analysis.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2022)
Article
Engineering, Electrical & Electronic
Pawel Gorecki
Summary: This article proposes an electrothermal model of a diode-insulated gate bipolar transistor switch for modeling dc-dc converters. The model can compute both the electrical characteristics of the converter and the junction temperatures of the semiconductor devices. The model's equations allow for modeling the converter's operation in both continuous conduction mode and discontinuous conduction mode. The correctness of the model is experimentally verified for the boost converter, showing good accuracy in modeling the converter's characteristics. An active .cir file based on the model for analysis in the SPICE program is attached to the article.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Multidisciplinary
Amin Ashraf Gandomi, Leila Parsa, Keith A. Corzine, Vahid Dargahi
Summary: In this paper, a fault-tolerant isolated dc-dc converter is proposed for shipboard power applications. The converter is optimized based on minimizing the losses and features better fault tolerance options. Experimental results verify its operation in both normal and faulty conditions.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2023)
Article
Automation & Control Systems
Myeong-Hwan Kim, Jae-Woong Park, Minsung Kim
Summary: In this article, a bridgeless filterless neutral-point-clamped (NPC) resonant ac/dc converter is presented. The proposed converter utilizes the push-pull transformer to achieve theoretically zero input-current ripple, eliminating the need for an extra input filter. The combination of semibridgeless configuration and resonant NPC structure significantly reduces conduction loss and voltage stress, achieving low cost, high power density, and high efficiency. A 1-kW prototype is implemented to validate the superior properties of the proposed ac/dc converter.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Review
Engineering, Electrical & Electronic
Joseph Peter Kozak, Ruizhe Zhang, Matthew Porter, Qihao Song, Jingcun Liu, Bixuan Wang, Rudy Wang, Wataru Saito, Yuhao Zhang
Summary: This article reviews the current understanding of the stability, reliability, and robustness issues of GaN power devices, particularly those related to dynamic switching, and their impacts on system performance. It aims to provide power electronics engineers with the necessary information for deploying GaN devices in existing and emerging applications, as well as references for qualification evaluations. The issues covered include the dynamic instability of device parameters, the device's robustness in avalanche, overvoltage and short-circuit conditions, its switching reliability and lifetime, and its ruggedness under radiation and extreme temperatures.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Yunting Liu, Fang Z. Peng
Summary: This article presents a DC capacitor-less Solid State Variable Capacitor (SSVC) which removes bulky DC capacitors used in traditional systems, simplifying the structure and improving reliability. By utilizing AC-side voltage to support DC voltage, this innovative approach only requires a small capacitor for filtering, enabling the removal of other capacitors from the DC link busbar.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Computer Science, Information Systems
Yuanmao Ye, Teke Hua, Xiaolin Wang
Summary: A new 9-level inverter is developed by using a single dc voltage source to feed both a 4-level switched-capacitor unit and a 3-level NPP/NPC unit simultaneously, with the advantages of simpler structure and lower cost per level compared to existing solutions. The proposed inverter is highly suitable for low voltage applications such as PV and fuel cells, and detailed analysis of circuit configuration, operation, and system characteristics under POD-PWM modulation is provided in the study. Feasibility and dynamic performance are also experimentally demonstrated.
Article
Energy & Fuels
Daniel L. Gerber, Fariborz Musavi, Omkar A. Ghatpande, Stephen M. Frank, Jason Poon, Richard E. Brown, Wei Feng
Summary: This study derived loss models of DC/DC and AC/DC PFC boost converters with identical components, showing that DC boost converters are more efficient than AC boost converters. Though boost converters are a small fraction of electronics in buildings, these loss models can lay the foundation for a comprehensive analysis based on full-building models.
Article
Engineering, Electrical & Electronic
Injun Hwang, Soogine Chong, Younghwan Park, Sun-Kyu Hwang, Boram Kim, Joonyong Kim, Jaejoon Oh, Jun Hyuk Park, Dong-Chul Shin, Min Chul Yu, Jai Kwang Shin, Jongseob Kim
Summary: This study focuses on the transient measurement of the drift region potential in AlGaN/GaN HEMT under high power state, revealing that the propagation speed of high electric field in the device is influenced by the drift region voltage, and proposing that trapping of hot channel electrons is causing this effect.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Computer Science, Information Systems
Michael Haider, Dominik Bortis, Grayson Zulauf, Johann W. Kolar, Yasuo Ono
Summary: This study focuses on the motor integration of single-phase-supplied Variable-Speed Drives (VSDs), proposing the concept of using the kinetic energy of the motor as a buffer. It presents a detailed control technique and structure that meet the requirements for nominal and faulted operation. The hardware demonstrator validates the proposed concept, achieving high power density and efficiency.
Article
Engineering, Electrical & Electronic
Zikang Tong, Zhechi Ye, Juan Rivas-Davila
IEEE MICROWAVE MAGAZINE
(2022)
Article
Automation & Control Systems
Zikang Tong, Lei Gu, Juan Rivas-Davila
Summary: Class Phi(2) is a suitable power amplifier (PA) topology for low device voltage stress and simple gate driving applications. By incorporating phase-switched impedance modulation variable capacitor and reactance compensation network, this architecture can operate efficiently across a wide bandwidth.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Jason Poon, Mohit Sinha, Sairaj V. Dhople, Juan Rivas-Davila
Summary: A hybrid analog/digital computing circuit is proposed to solve a selective harmonic minimization problem, leveraging the advantages of digital and analog controllers. The circuit can quickly converge to the optimal solution with low power consumption in hardware implementation.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
David Menzi, Saransh Chhawchharia, Grayson Zulauf, Dominik Bortis, Hans-Peter Nee, Johann W. Kolar
Summary: Phase-modular buck-boost dc/ac inverters are advantageous for variable-speed motor drives powered from dc sources. This letter introduces two new modulation schemes and demonstrates their efficiency improvement compared to conventional schemes.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Kawin Surakitbovorn, Juan M. Rivas-Davila
Summary: This article presents an alternative approach to designing a high-efficiency high-power RF amplifier system by directly combining the output powers of multiple amplifiers without the need for a power combiner network. The method is demonstrated with a kilowatt-class power amplifier design.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
David Menzi, Jonas E. Huber, Lorenz Kappeler, Grayson Zulauf, Johann W. Kolar
Summary: Variable speed drives (VSDs) are crucial for global electrification, and the proposed RPI-YI concept in this article significantly reduces inductor stress and volume in VSD systems, enabling more compact and efficient motor drive systems.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Tuofei Chen, Lei Gu, William J. Dally, Juan Rivas-Davila, John Fox
Summary: In this article, a novel three-phase multilevel inverter (MLI) design is presented for photovoltaic applications. This design eliminates the need for large dc-link capacitors to buffer the 120-Hz power ripple and allows individual inverter modules to process trapezoidal power. The trapezoidal operation significantly improves the system's efficiency by enabling the inverter modules to output peak or zero power for most of the ac cycle. Experimental results show that the proposed design achieves a high efficiency of over 95%, outperforming the conventional MLI design by reducing losses by more than 20% at light load conditions.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Acoustics
Kristi Nguyen, Vakhtang Chulukhadze, Eric Stolt, Weston Braun, Jeronimo Segovia-Fernandez, Sombuddha Chakraborty, Juan Rivas, Ruochen Lu
Summary: This study presents a near-spurious-free lithium niobate thickness shear resonator with high Q and kt(2). By optimizing the design and using a novel acoustic design for spurious suppression, this resonator could potentially empower a new design space for low-loss and compact power converters.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Zhechi Ye, Kawin Surakitbovorn, Sanghyeon Park, Juan Rivas-Davila
Summary: This paper presents a 2 to 7 kV DC power supply with less than 10 Vpp voltage ripple designed for ion pumps. The circuit utilizes high-frequency inverters, planar PCB transformers, Dickson voltage multipliers, and ripple cancellation. The implemented prototype can maintain 0.1% ripple at light load while achieving 84% peak efficiency at 80 W.
2023 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, APEC
(2023)
Proceedings Paper
Acoustics
Kristi Nguyen, Eric Stolt, Weston Braun, Jeronimo Segovia-Fernandez, Sombuddha Chakraborty, Juan Rivas, Ruochen Lu
Summary: Piezoelectric power converters offer higher power density and efficiency compared to conventional circuits. This study introduces a near-spurious-free lithium niobate (LiNbO3) thickness shear resonator with high Q and k(t)(2) values, along with a spurious suppression region. The optimized LiNbO3 TS resonators have the potential to enable new design possibilities for low-loss and compact power converters.
2022 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS)
(2022)
Article
Engineering, Electrical & Electronic
Jiale Xu, Kawin Surakitbovorn, Benjamin Wang, Mark A. Cappelli, Juan Rivas-Davila
Summary: This paper presents a MHz Class E power amplifier with frequency selection to generate DBD plasma at two distinct frequencies, achieving high efficiency and output.
IEEE OPEN JOURNAL OF POWER ELECTRONICS
(2022)
Proceedings Paper
Automation & Control Systems
Eric A. Stolt, Weston D. Braun, Juan M. Rivas-Davila
Summary: This paper presents a closed-loop control method that regulates voltage through forward-zero cycle modulation. The technique uses a fixed-frequency, requires only one sensing operation per resonant period, and enables a fast transient response.
2022 IEEE 23RD WORKSHOP ON CONTROL AND MODELING FOR POWER ELECTRONICS (COMPEL 2022)
(2022)
Article
Engineering, Electrical & Electronic
Michael Haider, Simon Fuchs, Grayson Zulauf, Dominik Bortis, Johann W. Kolar, Yasuo Ono
Summary: Next-generation Variable Speed Drive (VSD) systems use SiC MOSFETs to achieve high efficiency and power density, but face challenges with high voltage slew rate. This study evaluates the attractiveness of using an external Miller capacitor to limit the maximum voltage slew rate and proposes models to assess this technique. The proposed technique achieves lower losses compared to a gate resistor-only approach under dv(DS)/dt-limited conditions.
IEEE OPEN JOURNAL OF POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Jiale Xu, Zikang Tong, Juan Rivas-Davila
Summary: This paper presents a 1 kW wideband Class E power amplifier using Silicon Carbide (SiC) MOSFETs. The amplifier achieves 93% efficiency and a bandwidth of +/- 1 MHz, with the incorporation of a reactance compensation network and a custom gate drive circuit.
IEEE OPEN JOURNAL OF POWER ELECTRONICS
(2022)