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 12 of 12 for “"Gate driving"”.
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Advancements in resonant and current source gate driving techniques for fast switching Wide Band Gap (WBG) Metal Oxide Field Effect Transistors (MOSFETs)
Traditional methods for driving the Metal Oxide Field Effect Transistor, like the Voltage Source Gate Driver (VSGD), prove to be inefficient for high-frequency operation, especially in applications where Wide-Bandgap devices are used. This is because of their losses and poor control over the …
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Device Selection Criteria--Based on Loss Modeling and Figure of Merit
… model, which includes the factor of Qgs2, the gate-driving voltage and the packaging parasitics. Furthermore, a simple method is proposed to select the right device and gate-driving voltage for different circuit conditions. A new simple and accurate closeform model for device loss with packing …
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High Frequency, High Current Density Voltage Regulators
… and the self-driven technique recycles the gate driving energy by making use of the input capacitor of the secondary- side synchronous rectifier (SR) as the snubber capacitor of the primary-side switches. Compared to the external driver, the proposed converter can save driving loss and …
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Fault detection design for three-phase voltage source inverter in power train applications
… the proposed algorithm to compare the reference gate-driving signal with the actual output voltage of the voltage source inverter (VSI) to detect the occurrences of faults. Furthermore, to facilitate this investigative journey, intricate simulation models are thoughtfully crafted utilizing the …
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Optically Controlled Vertical GaN finFET for Power Applications
… made of such devices often require complicated gate-driving circuits and are susceptible to electromagnetic interference (EMI). Optically triggered power devices can significantly improve circuit complexity, EMI susceptibility, and system reliability. This thesis presents the first demonstration …
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A Constant ON-Time 3-Level Buck Converter for Low Power Applications
… the buck converter. This thesis research investigated the first stage converter of a car black box to provide power to a microprocessor, camera, and several other peripherals. The input voltage of the converter is 12 V, and the output voltage is 5 V with the load range being 20 mA (100 mW) to …
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EFFICIENT VOLTAGE REGULATION USING SWITCHED CAPACITOR DC/DC CONVERTER FROM BATTERY AND ENERGY HARVESTING POWER SOURCES
… portable technologies. This dissertation investigates different circuit techniques and SC converter topologies to make the SC converters fully adapt to the portable system requirements. To make the SC converter efficient over a wide range of input and output voltages, a family of SC power stages …
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Investigation of a GaN-Based Power Supply Topology Utilizing Solid State Transformer for Low Power Applications
… nitride (GaN) power devices exhibit a much lower gate capacitance for a similar on-resistance than its silicon counterparts, making it highly desirable for high-frequency operation in switching converters, which leads to their significant benefits on power density, cost, and system volume. …
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Investigation of Power Semiconductor Devices for High Frequency High Density Power Converters
… power converter applications have been investigated. Firstly, the methodology is developed to evaluate the power semiconductor devices for high power density applications. The power density figure of merit (PDFOM) for power MOSFET and IGBT are derived from the junction temperature rise, power …
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State-Trajectory Analysis and Control of LLC Resonant Converters
… operate at a high switching frequency. Thus the driving of the synchronous rectifier (SR) poses a design challenge as well. To analyze the fast dynamic characteristic, a graphic state-plane technique has been adopted for a class of resonant converters. In this work, it has been extended to the …
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High Voltage Synchronous Rectifier Design Considerations
… on the rectifier architecture: (1) multilevel gate driving for single switch rectifiers; (2) sequential parallel switching for parallel switch rectifiers. In summary, this dissertation focuses on developing a practical and reliable high voltage SR solution for LLC-DCX converters. Three main …
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Robustness of Gallium Nitride Power Devices
… (UIS) test on two mainstream commercial p-gate GaN HEMTs with the Ohmic- and Schottky-type gate contacts, where the GaN HEMT is found to withstand surge energy through a resonant energy transfer between the device capacitance and the loop inductance. The failure mechanism is identified to …