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A New Active Power Controller in Dual Active Bridge DC-DC Converter With a Minimum-Current-Point-Tracking Technique

ieee journal OF emerging AND selected topics IN POWER ELECTRONICS 2021年第2期9卷 1328-1338页

作者： Hebala, Osama M. Aboushady, Ahmed A. Ahmed, Khaled H. Abdelsalam, Ibrahim Burgess, Samuel J. Arab Acad Sci & Technol & Maritime Transport Elect & Control Engn Dept Alexandria 1029 Egypt Glasgow Caledonian Univ Sch Comp Engn & Built Environm Glasgow G4 0BA Lanark Scotland Univ Strathclyde Dept Elect & Elect Engn Glasgow G1 1XW Lanark Scotland Alexandria Univ Fac Engn Dept Elect Engn Alexandria 21544 Egypt Arab Acad Sci & Technol & Maritime Transport Elect Engn Dept Alexandria 1029 Egypt Robert Gordon Univ Sch Engn Aberdeen AB10 7AQ Scotland

This article proposes a new controller for power regulation in dual active bridge (DAB) dc-dc converter based on a new scheme that tracks minimum RMS current to ensure minimum losses. The proposed controller is based on an implementation of perturb and observe (P&O) tracking method that enables minimum current point tracking (MCPT) at any desired level of active power transfer and dc voltage ratio. The P&O is embedded in a closed-loop control scheme which simultaneously regulates active power in DAB converter. The nonlinear I-V characteristic of DAB presents the basis for this proposed controller and the rationale of using P&O algorithm. The proposed controller does not require complex nonlinear converter modeling and is not circuit parameter dependent. Design procedure of the proposed controller is presented, and extensive simulation is carried out using MATLAB/Simulink to validate the effectiveness of the proposed MCPT closed-loop controller. An experimental prototype also substantiates the results achieved.

关键词： Bridge circuits Power electronics Voltage control Minimization Switches Stress Optimization Dual active bridge (DAB) minimum current point tracking (MCPT) perturb and observe (P&O) RMS current stress

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Introducing ieee Collabratec

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ieee journal on emerging and selected topics in circuits and systems 2024年第3期14卷 576-576页

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Introducing ieee Collabratec

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ieee journal on emerging and selected topics in circuits and systems 2024年第4期14卷 836-836页

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Introducing ieee Collabratec

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ieee journal on emerging and selected topics in circuits and systems 2024年第1期14卷 144-144页

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Bidirectional Bootstrapped Gate Driver for High-Density SiC-Based Automotive DC/DC Converters

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ieee journal OF emerging AND selected topics IN POWER ELECTRONICS 2020年第1期8卷 475-485页

作者： Soldati, Alessandro Imamovic, Emir Concart, Carlo Univ Parma Dept Engn & Architecture I-43124 Parma Italy

Bootstrap-based gate drivers are one of the simplest and cheapest solutions for driving the high-side devices in half-bridge-based power converters. Unfortunately, bootstrapped gate drivers are unable, on their own, to supply the negative gate-source voltage needed for safe turn off of SiC MOSFETs. This article proposes a novel and simple level shifter, applied to bootstrap-based gate drivers, able to supply a negative gate voltage to isolated-gate power devices during turn off. A fully analytical model of the proposed circuit is given, targeting both steady-state and transient performance. Modeling of the power loss connected to the driver is included as well. Performance of the gate driver with a level shifter is assessed experimentally, and the circuit layout for the power stage of a dual active bridge automotive dc/dc converter, set on an insulated metal substrate, is presented, comprising the power devices together with the proposed gate drivers and ancillary circuits.

关键词： Gate drivers Batteries Logic gates Silicon carbide MOSFET Bridge circuits Capacitors Automotive electronics dc-dc power converters driver circuits switching circuits wide bandgap semiconductors

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A Method to Eliminate Discrete Inductors in a Class-E Inverter Used in Wireless Power Transfer Applications

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ieee journal OF emerging AND selected topics IN POWER ELECTRONICS 2020年第3期8卷 2167-2178页

作者： Surakitbovorn, Kawin Rivas-Davila, Juan M. Stanford Univ Dept Elect Engn Stanford CA 94305 USA

Wireless power transfer (WPT) systems have attracted tremendous attention over the past decade. Most compact, low-power, WPT systems, however, utilize ferrites to shield and redirect the magnetic fields. Using a magnetic material adds the weight and system bulk. In this article, we present a method to design the WPT coils in which the leakage and magnetizing inductances are utilized in other parts of the circuit. This eliminates the need for discrete inductors commonly required in a resonant inverter, which additionally improves overall efficiency. Utilizing this technique, we demonstrate a small and lightweight 300-W 48-to-48-V WPT system with above 90% efficiency. We further propose a method to eliminate the input inductor required by the class-E inverter by utilizing the input power supply wires. Employing this method, we demonstrate a printed circuit board (PCB)-based WPT circuit operating at 40.68 MHz, utilizing no discrete inductors other than the WPT coils themselves and weighing only 7 g. This article describes the design methodology as well as the procedure to eliminate the discrete resonant inductors used in the implementation of our designs.

关键词： Coils Inductors Inverters Inductance Magnetic resonance Magnetic circuits RLC circuits Class-E amplifier gallium nitride (GaN) high frequency (HF) inductor elimination printed circuit board (PCB)-based circuit very high frequency (VHF) wireless power transfer (WPT)

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Advanced Transfer Printing With In-Situ Optical Monitoring for the Integration of Micron-Scale Devices

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ieee journal OF selected topics IN QUANTUM ELECTRONICS 2023年第3期29卷 1页

作者： Guilhabert, Benoit Bommer, Sean P. Wessling, Nils K. Jevtics, Dimitars Smith, Jack A. Xia, Zhongyi Ghosh, Saptarsi Kappers, Menno Watson, Ian M. Oliver, Rachel A. Dawson, Martin D. Strain, Michael J. Univ Strathclyde Inst Photon Glasgow G1 1RD Scotland Univ Cambridge Cambridge Ctr Gallium Nitride Cambridge CB3 0FS England

Transfer printing integration of planar membrane devices on photonic and electronic circuits is becoming a well established technology. Typical systems incorporate a single planar layer printed into full contact with the host substrate. In this work we present an advanced transfer print system that enables printing of optical devices in non-planar geometries and allows in-situ optical monitoring of devices. We show micro-resonators with air-clad whispering gallery modes coupled to on-chip waveguides, inverted device printing and three dimensionally assembled micro-cavities incorporating semiconductor micro-lenses and nanowire lasers. We demonstrate printing onto non-standard substrates including optical chip facets and single-mode fibre ends. The optical fibre printing was carried out with alignment assistance from in-situ optical coupling through the transfer printing system in real-time allowing active alignment of the system.

关键词： Integrated optics optical waveguide components hybrid integrated circuits semiconductor device fabrication transfer printing photonic integration

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Optical and Electrical Memories for Analog Optical Computing

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ieee journal OF selected topics IN QUANTUM ELECTRONICS 2023年第2期29卷 1页

作者： Kari, Sadra Rahimi Ocampo, Carlos A. Rios A. Jiang, Lei Meng, Jiawei Peserico, Nicola Sorger, Volker J. J. Hu, Juejun Youngblood, Nathan Univ Pittsburgh Swanson Sch Engn Dept Elect & Comp Engn Pittsburgh PA 15261 USA Univ Maryland Dept Mat Sci College Pk MD 20742 USA Univ Maryland Inst Res Elect & Appl Phys College Pk MD 20742 USA Indiana Univ Bloomington Dept Intelligent Syst Engn Bloomington IN 47408 USA George Washington Univ Sch Engn & Appl Sci Dept Elect & Comp Engn Washington DC 20052 USA Optelligence LLC Upper Marlboro MD 20772 USA MIT Dept Mat Sci & Engn Cambridge MA 02139 USA

Key to recent successes in the field of artificial intelligence (AI) has been the ability to train a growing number of parameters which form fixed connectivity matrices between layers of nonlinear nodes. This "deep learning " approach to AI has historically required an exponential growth in processing power which far exceeds the growth in computational throughput of digital hardware as well as trends in processing efficiency. New computing paradigms are therefore required to enable efficient processing of information while drastically improving computational throughput. emerging strategies for analog computing in the photonic domain have the potential to drastically reduce latency but require the ability to modify optical processing elements according to the learned parameters of the neural network. In this point-of-view article, we provide a forward-looking perspective on both optical and electrical memories coupled to integrated photonic hardware in the context of AI. We also show that for programmed memories, the READ energy-latency-product of photonic random-access memory (PRAM) can be orders of magnitude lower compared to electronic SRAMs. Our intent is to outline path for PRAMs to become an integral part of future foundry processes and give these promising devices relevance for emerging AI hardware.

关键词： Optical computing Memory management Photonics Ultrafast optics Optical noise Computer architecture Optical crosstalk Artificial intelligence neural network hardware analog computers optical computing analog processing circuits

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Multi Objective Modulated Model Predictive Control of Stand-Alone Voltage Source Converters

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ieee journal OF emerging AND selected topics IN POWER ELECTRONICS 2020年第3期8卷 2559-2571页

作者： Majmunovic, Branko Dragicevic, Tomislav Blaabjerg, Frede Univ Colorado Dept Elect Comp & Energy Engn Boulder CO 80309 USA Aalborg Univ Dept Energy Technol DK-9100 Aalborg Denmark

This paper introduces a novel model predictive control (MPC) strategy for stand-alone voltage source converters (VSCs) with constant switching frequency. Multiple control targets are incorporated in a single cost function. This allows fulfilling all the requirements for an uninterruptible power supply (UPS) inverter in terms of fast dynamic response, elimination of steady-state error, and harmonic compensation capability. The control output vector is determined as an analytical solution that corresponds to the minimum value of the cost function. The space vector modulation (SVM) is then used to synthesize the corresponding switching sequence. Therefore, this control strategy is equivalent to the linear state feedback control, which allows the usage of linear theory for tuning the parameters. The superior characteristics of this control strategy compared to cascaded linear control and finite control set MPC are, finally, demonstrated experimentally.

关键词： Uninterruptible power systems Voltage control Switches Cost function Integrated circuits Inverters Voltage measurement Constant switching frequency model predictive control (MPC) stand-alone voltage source converters (VSCs) uninterruptible power supply (UPS)

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High-Current Switched Capacitor Converter for On-Package VR With PDN Impedance Modeling

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ieee journal OF emerging AND selected topics IN POWER ELECTRONICS 2020年第2期8卷 1633-1643页

作者： Ursino, Mario Saggini, Stefano Jiang, Shuai Nan, Chenhao Rinaldo, Roberto Rizzolatti, Roberto Univ Udine Polytech Dept Engn & Architecture DPIA I-33100 Udine Italy Google Inc Sunnyvale CA 94089 USA Infineon Technol Austria AG Villach Austria

Digital ASIC devices are widely used in networking and computing applications. This kind of devices is implemented with a short-channel technology requiring high peak currents for high complexity systems and a low supply voltage. Digital ASICs are powered by an external voltage regulator with specifications similar to modern microprocessorsx2019;power supply [voltage regulation modules (VRMs)]. In order to reduce the number of power pins and to reduce the power distribution network (PDN) issue, Intelx2019;s Fourth-Generation Core integrates the voltage regulators. Moreover, many on-package conversion systems are present in the literature. In this article, a conversion solution based on a switched resonant tank is presented, yielding currents up to 300 A at 0.8 V, in an area of 10 cm(2), with a resonant-driving technique. The novel converter is used to validate a new linear time-periodic (LTP) system modeling approach that can be applied to generic switched topologies;this contribution yields a mathematical description of the conversion chain, in particular enabling the precise calculation of the output impedance when a switched topology is used as the last stage.

关键词： Impedance Capacitors Switches Resonant frequency Resistance Voltage control Inductance DC-DC power converters impedance matching linear systems switched capacitor circuits zero voltage switching

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