Browsing by Subject "Breakdown voltage -- Mathematical models"
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Item Electrical characteristics of breakdown phenomena(Texas Tech University, 2003-12) Haustein, Mark AThe phenomenology of breakdown in gases and liquids, and surface flashover at atmospheric pressures are investigated with high-speed electrical and optical diagnostics. The experiments utilize a 50Q coaxial transmission line system with an axial discharge and a load line to simulate a matched terminating impedance. DC breakdown, and in part pulsed breakdown, are characterized for argon gas, subcooled liquid nitrogen, biodegradable oil and vacuum. The discharge current and voltage are measured via transmission line current sensors and capacitive voltage dividers, which have a working range of 0.1 mA to IkA with temporal resolutions of 300 ps. Light emission is measured by photomultiplier tubes (800 ps risetime) and high speed photography. Some results indicate the presence of prebreakdown events preceding the main self-breakdown. These events occur microseconds before the main breakdown as nanosecond current and luminosity spikes.Item High voltage line pulser for pulsed power testing(Texas Tech University, 2003-05) Keene, HeathNot availableItem Limitations of switching voltage regulators(Texas Tech University, 2004-05) Vallamkonda, SathishNearly almost every electronic system utilizes a regulated power supply as an essential requirement for its proper operation. Switching voltage regulation is the technique by which an unregulated source power is efficiently converted to regulated load power through the use of controlled power switching devices and energy transfer elements. These switching voltage regulators uses magnetic components like inductors, for storing and transferring energy, which are bulky in size and often suffers from EMI, winding and core losses. Depending on the power level, modem IC switching regulators may integrate the entire converter except for the main magnetic element and the input/output capacitors. Presence of inductor in the converter means the converter size is bulky even at higher frequencies. These are the major limitations for a switching regulator to take an integrated circuit (IC) form. Switched-mode voltage converter circuits that utilize 'capacitors only' as the energy transfer elements are called switched capacitor voltage converters or charge pump voltage converters. Switched-capacitor voltage converters are attractive because they use no magnetic components and are easily amenable to monolithic integration. At the beginning, this thesis describes about the operation, design and simulation of various techniques used in voltage conversion using switching voltage regulators aiming at decreasing the size of the reactive elements. Finally, it describes about the new kind of switching voltage regulators having no inductors called switched-capacitor voltage regulators or charge-pump voltage regulators.