A5056853238- Electromagnetic Compatibility and Noise Suppression
- Electrostatic Discharge in Electronics
- Advanced DC-DC Converters
- Multilevel Inverters and Converters
- Silicon Carbide Semiconductor Technologies
- Microgrid Control and Optimization
- Semiconductor materials and devices
- Integrated Circuits and Semiconductor Failure Analysis
- Radio Frequency Integrated Circuit Design
- Advancements in Semiconductor Devices and Circuit Design
- Metamaterials and Metasurfaces Applications
- Analog and Mixed-Signal Circuit Design
- HVDC Systems and Fault Protection
- Quantum and electron transport phenomena
- Electromagnetic Compatibility and Measurements
- Low-power high-performance VLSI design
- Advanced Antenna and Metasurface Technologies
- Advanced Optical Sensing Technologies
- Magnetic properties of thin films
- Microwave Engineering and Waveguides
- Plasmonic and Surface Plasmon Research
- Physics of Superconductivity and Magnetism
- Semiconductor Quantum Structures and Devices
- Analytical Chemistry and Sensors
- Terahertz technology and applications
Yangtze University
2025
Fudan University
2006-2024
Jinzhou Medical University
2024
Jiangnan University
2012-2024
Tongji University
2024
Dongfeng Motor (China)
2024
Nantong University
2023
State Key Laboratory of Remote Sensing Science
2023
Marvell (United States)
2013-2022
University of Florida
1995-2022
Single-phase pulsewidth modulation rectifiers suffer from ripple power pulsating at twice the line frequency. The is usually filtered by a bulky capacitor bank or an LC branch, resulting in lower density. alternative way active decoupling, which uses circuit to direct into another energy-storage component. main dc-link filter can, therefore, be reduced substantially. This paper proposed new scheme of decoupling. consists third leg, and smoothing inductor. topology combined advantages high...
In this paper, a selective harmonic current mitigation pulsewidth modulation (SHCM-PWM) technique with low switching frequencies is proposed for grid-connected cascaded H-bridge multilevel rectifiers to fully meet requirements within extended spectrum. the technique, instead of using voltage references calculate angles rectifier as in conventional elimination-PWM (SHE-PWM) or mitigation-PWM (SHM-PWM), are used compensate harmonics due both grid and input so total demand distortion whole...
We present a constrained membrane-type acoustic metamaterial (CMAM) that employs constraint sticks to add out-of-plane dimensions in the design space of MAM. A CMAM sample, which adopts suppress vibrations at membrane center, was fabricated achieve sound transmission loss (STL) peak 26 dB 140 Hz, with static areal density 6.0 kg/m2. The working mechanism as an is elucidated by calculating averaged normal displacement, equivalent density, and effective dynamic mass unit cell through finite...
We report the mechanism for simultaneous realization of acoustic perfect absorption (PA) and broadband insulation (BI) in free field by a layered metamaterial (LAM). The proposed LAM comprises two critically coupled membrane-type metamaterials sandwiching porous material layer. Both theoretical experimental results verify that sample can achieve nearly PA (98.4% experiments) at 312 Hz with thickness 15 mm (1/73 wavelength) BI frequency range 200–1000 an areal density 2.2 kg/m2. In addition,...
Applying the selective harmonic elimination (SHE) technique to grid-connected-cascaded modular multilevel inverters has been widely discussed in literature. However, due difficulties of solving high-order nonlinear transcendental equations, SHE cannot be implemented real time so its applications are limited. This paper presents a convert equations specific control system and use look-up table, integral controllers decoupling controller help converge zero-error steady state. An inner...
Battery/supercapacitor (SC) hybrid energy storage system (HESS) is an effective way to suppress the power fluctuation of photovoltaic (PV) generation during radiation change. This study focuses on sharing between different components with two optimisation objectives: loss and state charge SC. First, topology HESS its connection PV are analysed. Second, control targets have been organised as objectives. A linear weighted summation algorithm based variable weights proposed solve...
Miniature power semiconductor devices mounted on printed circuit boards (PCBs) are normally cooled by means of PCB vias, copper pads, and/or heatsinks. Various reference thermal designs have been provided manufacturers and researchers. However, the recommendations not optimal, there some discrepancies among them, which may confuse electrical engineers. This paper aims to develop analytical resistance models for vias further obtain optimal design minimization. First, via array is thermally...
Gallium nitride enhancement-mode high electron mobility transistors (GaN E-HEMTs) can achieve frequency and efficiency due to its excellent switching performance compared with conventional Si transistors. Nevertheless, GaN HEMTs exhibit a more pronounced dynamic ON-state resistance R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">DS(ON)</sub> than silicon The variation of is caused by both the static junction temperature rise RDS(ON) trapping....
Soft magnetic composites (SMCs) based cores are attractive in high-frequency inductor design. The desired overall core permeability of SMC can be achieved by adjusting the powder size, addition insulation material and phosphoric acid, pressure during preparation process to reduce air gap loss ease nanocrystalline alloy (Fe-Cu-Nb-Si-B) is an emerging with high saturation flux density low hysteresis loss, showing potential suitability for SMC-based cores. To date, alloys mostly used form...
A one-step two-electron oxygen reduction pathway is crucial for the stable and efficient photosynthesis of hydrogen peroxide.
Using a pair of weakly coupled drift-diffusion equations for spin-up and spin-down electrons, we compute the signal recent spin-injection experiments by Johnson on ferromagnetic-paramagnetic-ferromagnetic films. In limit large junction resistance, our results coincide with those earlier calculations. As resistance decreases, there are correction terms which provide cutoff to size films much thinner than spin-diffusion length. The physical origin this is leakage nonequilibrium magnetization...
EMC spectrum analyzers are popularly used for electromagnetic interference (EMI) measurement in power electronics systems. Depending on the specifications of EMI standards, could be very time consuming. Conventionally, fast Fourier transform is to derive from measured time-domain waveforms. However, these results may not agree with analyzers, and sometimes difference significant. In this paper, a technique quickly accurately predict analyze waveforms proposed. The developed based analyzer's...
This article proposes a voltage-source converter for an on-board electric vehicle charger, which is compatible with both the single- and three-phase (1-φ 3-φ) grids. The classic 3-φ active ac–dc rectifier circuit used 1-φ connections, but new control scheme <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCL</i> filter are designed to address double-line frequency power pulsation issue caused by grid without using bulky dc capacitors. third...
For the radiated electromagnetic interference pre-compliance diagnosis in power electronics systems, measurement of common mode (CM) currents, impedances, and voltages are essentially important. In this article, two issues first identified CM current impedance measurement. The is coupling between cables attached to a converter coaxial cable connected equipment. It degrades accuracy. second converter's ac grid. repeatability measurements. To improve accuracy repeatability, article proposes an...
The intersection of hydraulic fractures and thin interlayers presents a prevalent challenge in stimulating unconventional reservoirs. This paper introduces novel method for simultaneous pouring multiple cement materials to create fracturing specimens within interlayers, which are better integrated with the reservoir due their smooth natural cementation. We conduct experiments on various across different well types assess efficacy inclined bending emanates from highly deviated penetrating...
The orbital mechanism of negative magnetoresistance variable-range-hopping conductivity is reconsidered by numerical simulations and qualitative arguments. At small magnetic fields the positive magnetic-field corrections to localization length in two-dimensional samples are universal sense that they independent details scattering potential (impurity concentration, amplitude scattering, proximity metal-insulator transition). Implications these results transport properties on dielectric side...
Cascaded multilevel converter (CMC)-based energy storage system, which consists of cascaded H-bridge converters and components, is a promising option to compensate fluctuating electric power renewable energy. This paper proposes novel single-phase CMC-based battery includes an <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LC</i> branch. The cells the branch form auxiliary loop, could realize active exchange between different with proposed...
Synthetic aperture radar (SAR) can measure the phase with antenna and microwave, which cannot be directly extended to visible light imaging due lost. In this letter, we reported an active remote sensing via reflective Fourier ptychography (FP), termed coherent synthetic (CSAI), achieving high resolution, wide field-of-view (FOV) recovery. A proof-of-concept experiment was laser scanning a collimator for infinite object. Both smooth rough objects are tested, spatial resolution increased from...
With increasing demand in next-generation data centers and high-performance computing networking, wireline transceivers are required to operate at 112Gb/s provide high bandwidth [1]–[3], meanwhile it is necessary handle >40dB insertion loss support legacy channels large package designs [4]. Low-power design also critical for the integration of multiple [5]. To advance state-of-the-art design, this work presents an ADC/DAC-DSP based PAM-4 transceiver capable equalizing >50dB lossy achieving...
The parasitic capacitance of magnetic components, i.e., inductors and transformers, are crucial, because it dominates the high-frequency impedance, causes voltage / current spikes, arouses electromagnetic interference issues. existing methods characterize from all five parts (turn-to-turn, layer-to-layer, winding-to-magnetic core, winding-to-electrostatic screen, interwinding). However, calculated results always less than measured capacitance, especially for with few winding turns. This...