Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 108 for “"Breakdown Voltage"”.
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Spark Breakdown Voltage Sampling During Early Stage Compression
… between the value of Spark Break-Down Voltage (SBDV) to gas density and speciation. The methodology presented, applied pulses of voltage to the spark plug, which is normally used only to initiate ignition, to also function as a non-intrusive in-cylinder sensor. Experimental results were …
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ΕΠΙΔΡΑΣΗ ΤΗΣ ΜΟΡΦΗΣ ΘΕΤΙΚΗΣ ΚΡΟΥΣΤΙΚΗΣ ΤΑΣΗΣ ΚΑΙ ΤΩΝ ΠΑΡΑΜΕΤΡΩΝ ΤΟΥ ΔΙΑΚΕΝΟΥ ΣΤΗΝ ΕΞΕΛΙΞΗ ΤΗΣ ΔΙΑΣΠΑΣΗΣ ΣΕ ΜΙΚΡΑ ΔΙΑΚΕΝΑ ΑΕΡΑ
… OF THE IMPULSE FORM AND PARAMETERS ON THE BREAKDOWN VOLTAGE OF ROD-PLANE AIR-GAPS BETWEEN ONE AND FIFTY FIVE CENTIMETERS WAS INVESTIGATED A 12 MM CYLINDRICAL ROD WITH THE FOLLOWING TERMINATION: - 30 DEGREE CONE, - HEMISPHERE, - SQUARE-CUT AND IMPULSE VOLTAGES OF THE FOLLOWING FORMS: 1/36 …
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Breakdown characteristic of palm oil and coconut oil under AC and DC voltage with different moisture rate
… in the oil must be at a low level. Therefore, breakdown voltage tests using direct current and alternating current with the addition of different water content were performed to identify the potential of palm oil and coconut oil in the transformer isolation system. Refined, Bleached and …
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Performance enhancement of GaN-based high-power hemts by selective-area growth using plasma-assisted molecular beam epitaxy
… higher peak drain currents and higher breakdown voltages. Since the results indicated that SAG is effective in fabricating HEMTs for high power applications, it was then employed to fabricate large-periphery AlGaN/GaN HEMTs for high current operation. A high saturation current of 1.75A …
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Air breakdown under lightning impulse with plane-plane electrode
Breakdown voltage is a phenomenon where the quantity of an electrical force is required to transform the electrical properties of an object. In other words, breakdown voltage is also called the striking voltage. This breakdown voltage of an insulator is the minimum voltage that can cause some part …
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Lightning impulse tests on air-breakdown level in point-plane electrode configuration
… fundamental characteristics of the electrical breakdown. Breakdown voltage is a phenomenon where the quantity of an electrical force is required to transform the electrical properties of an object. Many factors that lead to the breakdown voltage are still not fully discovered. These factors are …
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Power Module with Series-connected MOSFETs in Flip-chip Configuration
… power module with high efficiency and improved breakdown voltage, this thesis proposes a novel series-connected power MOSFETs module. Three IRF7832 MOSFETs (30 V breakdown voltage) in series are simulated in a chopper circuit. The drain-source voltage sharing in switching off-mode shows that the …
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AlGaN/GaN-based power semiconductor switches
… semiconductor switches, thanks to their high breakdown electric field, mobility and charge density. The ability to grow these devices on large-diameter Si wafers also reduces device cost and makes them easier for wide market adoption. However, the development of AlGaN/GaN-based power switches …
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Simulation and fabrication of GaN-based vertical and lateral normally-off power transistors
… transistors (HEMTs) designed for different breakdown voltage application and at different size scaling levels. The comparison between two structures revealed that the vertical MOSFETs have the potential to achieve an up to 50% higher thermal performance, especially for higher breakdown …
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High-performance compact gas filled spark switches
… closing times with low jitter, and their high voltage and current capability. Recently there has been a renewed interest in designing spark switches that can operate with environmentally friendly gases such as air. This thesis presents an investigation into gas filled plasma closing (spark) …
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A study of carbon and iron charged point defects in gallium nitride: electronic structure implications for high-power photoconductive solid state switch applications
… TCAD tool to compute trans- port properties and breakdown voltage of GaN, C-doped GaN, and Fe-GaN. Result shows that all material properties such as mechanical, optical, polar- ization, transport properties, and the breakdown transport properties and breakdown voltage changed due to the presence …
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LATERAL POWER DEVICES AND TECHNOLOGIES FOR HIGH VOLTAGE INTEGRATED CIRCUITS
The prime objective of a High Voltage Power Integrated Circuit (HVPIC) is to integrate high power and low power devices on the same wafer. Such a Power Integrated Circuit (PIC) benefits in cost, weight, functionality and reliability. A Lateral MOS controlled Power Device is a key component in such …
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Thin Film Polymer Dielectrics for High-Voltage Applications under Severe Environments
… thermal stability, low moisture uptake, high breakdown voltage (low leakage current), low dielectric constant, low loss tangent, high glass transition temperature, and low surface roughness. The use of these polymers allows for advanced electronic packaging techniques, resulting in improved …
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Junction Based Gallium Nitride Power Devices
… device is to achieve low on-resistance and high breakdown voltage. Although GaN high electron mobility transistor (HEMT) is commercially available in a voltage class from 15 V to 900 V, the performance of GaN devices is still far below the GaN material limit, due to several reasons: 1) To achieve …
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Vertical gallium nitride power devices on bulk native substrates
… power range applications. However for higher voltage higher current switches, a vertical structure is preferred since its die area does not depend on the breakdown voltage. This thesis studies vertical GaN power diodes and transistors grown on bulk GaN substrates. The first part of the thesis …
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Technology assessment and market analysis of solid state ultracapacitors
… engineering dielectric materials to possess high breakdown voltage and/or DC permittivity. Among the available SSU models, Electrical Energy Storage Units (EESUs) have been reported to possess energy density as high as 280 Wh/kg with the permittivity and breakdown voltage enhancements achieved …
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Molecular Beam Epitaxy of Gallium Arsenide Antimonide-Based Ultra-High-Speed Double Heterojunction Bipolar Transistors and Light Emitting Transistors
… GaAs0.5Sb 0.5 DHBT, while maintaining a high breakdown voltage BVCEO ∼ 4V. The cutoff frequency---breakdown voltage product, fT·BVCEO, of over 2000 GHz-V, is the record value for DHBTs of any material system. Incorporating graded InAs-InGaAs emitter contact layer is also shown to …
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Development of high-performance GaN-based power transistors
… reduce the gate leakage current and enhance the breakdown voltage, gate-SiO2 deposited by radiofrequency magnetron sputtering is investigated. The routinely occurring degradation of the two-dimensional electron gas properties due to the sputtering-induced surface damage is effectively removed by …
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A Low Power Pulsed Arcjet Thruster for Spacecraft Propulsion
… the capacitor terminals is used to eliminate voltage reversals in the current. The experimental breakdown voltage of the helium gas between the electrodes is found to follow a Paschen relationship where the minimum electrode separation distance is used in evaluating the data.
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Development of In-Plane Compliant Bistable Microrelays
… time measurements, insertion loss, AC isolation, breakdown voltage, and DC isolation. This document also includes recommendations for further research.
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