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The slow recovery in pulsed drain current in AlGaN/GaN power HEMTs caused by high voltage stress during off-state becomes an important research topic in power electronic switching applications. To further investigate this phenomenon, the influence of gate drive towards the drain current recovery is investigated in this paper. The gate drive current can influence the de-trapping process along the AlGaN...
Normally-off operation is strongly desired for safety and efficient power switching in order to make the HEMT devices compatible with the currently used Si based IGBT and MOSFET devices. Combination of partially gate recess etching and gate insulator interface or floating gate charges in MIS structures is proposed and demonstrated for the first time to realize the normally-off mode. Partially gate...
Kirigami is a Japanese art-form by making cuts on paper together with geometric folding to form three-dimensional structures. This technique enables one to create visual presentation of an object in good and simple analogy. For the first time, the paper model of kirigami was applied in the classroom teaching of silicon MEMS (micro-electro-mechanical systems) course. These MEMS structures are in reality...
The AlGaN/GaN high electron mobility transistor (HEMT) has drawn great interest in high power and high frequency applications owing to its outstanding material advantages, such as large critical electric field, high electron saturation velocity and the ability to form the high-density two dimensional electron gas (2DEG) conduction channel at the hetero interface. In this paper, a topical review on...
In this paper, the influences of Al mole fraction and AlGaN layer strain relaxation on the bound polarization charges and the 2DEG concentration are investigated by theoretical calculation. The calculated sheet polarization charge data is used to preset Sentaurus TCAD to simulate the performance characteristics of the GaN HEMT device. The proposed method is proven to be a simple, equally accurate...
The demand for Photovoltaic (PV) energy system has been on the growth. A system planning software has been developed using C# and Windows Presentation Foundation (WPF) to aid the photovoltaic system design engineer to plan a standalone PV system with battery backup, taking into account of various key design parameters. It calculates the PV tilted angle, potential energy output from PV arrays, storage...
This paper presents an efficient solar energy harvesting circuit for mobile phone battery chargers which can also be easily adapted for other mobile devices. The energy harvesting circuit is capable of making Maximum Power Point Tracking (MPPT) and also has a built-in battery protection function. A polycrystalline solar panel which supplies an average of 400mW (under 1 sun solar insolation) of power...
Industrial process tomography is a non-invasive visualisation technique to obtain cross-sectional images of dynamic industrial processes. Electrical capacitance tomography (ECT) is the first developed and the most mature tomographic imaging technique used for industrial applications. Comparing with other tomographic techniques, it is relatively cheap, fast and safe. This paper describes the process...
This paper presents a practical methodology for realistic simulation on reverse characteristics of Wide Bandgap (WBG) SiC/GaN p-n junctions. The adjustment on certain physic-based model parameters, such as the trap density and photo-generation for SiC junction, and impact ionization coefficients and critical field for GaN junction are described. The adjusted parameters were used in Synopsys Medici...
The usage of power MOSFET functioning as a synchronous rectifier is a much preferred choice in switched-mode converters, especially for those of high-frequency and high-power density with low output voltage, for minimization of power loss and efficient energy management. However, its scope of application and integration as a replacement of diode rectifier is handicapped by the compulsory requirement...
The direct methanol fuel cell (DMFC) is considered as a potential power source candidate for portable electronics due to its high power density, efficient and environmental friendly operation. However, the fixed concentration fuel supply in existing DMFC systems relies on either the diluted methanol solution carrying or the active delivery driven by attached pump. Both approaches limit the power density...
This paper presents a methodology to simulate the reverse characteristics of realistic 4H-SiC pn junctions. The physical bases behind methodology of the simulation have been analyzed. The extensive collection of reported 4H-SiC pn junction diode data formed the basis of calibration of SYNOPSYS MEDICI for 4H-SiC pn junction simulation. Relevant parameters in the trap and photogeneration models are...
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