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 “"Large-Signal model"”.
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Digital control based on both small and large signal model based approaches for high switching frequency switched mode power converters
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Systematic Optimization Technique for MESFET Modeling
Accurate small and large-signal models of metal-semiconductor field effect transistor (MESFET) devices are essential in all modern microwave and millimeter wave applications. Those models are used for robust designs and fabrication development. The sophistication of modern communication systems …
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Gallium Nitride-Based HEMT Devices Modeling and Performance Characterization
… (MMICs). Power AlGaN/GaN MMIC design requires large signal modeling of the device. In bottom-up modeling techniques, the large signal model is based on small signal models derived at different bias conditions. In addition, noise performance analyses also require the knowledge of the small …
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Inverter design and analysis using multiple reference frame theory
… theory allows for periodically time varying signals to be represented as a set of dc signals. In other words, every periodic signal can be expanded into a Fourier series representation. By modeling an inverter connected to a boost maximum power point tracker (MPPT) in this manner, frequency …
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High linearity broad-band helix TWTs
… been identified. The main simulation tool for modelling the interaction processes in a generic helix TWT was a large-signal model (LSM). A helix slow-wave structure is normally tapered to maintain its phase relationship with the electron beam and to maximise its output RF power. By determining …
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Power Interface Design and System Stability Analysis for 400 V DC-Powered Data Centers
… are developed for the power converters. First, a model predictive control is developed for the cascaded totem-pole bridgeless PFC converter. This control provides stable transient performance and high power efficiency. Second, a power loss model based dual-phase-shift control is applied for the …
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Composite load modeling for power systems: Model reduction, identification, and application to conservation voltage reduction
Load modeling is essential to power system stability analysis, optimization, and controller design as shown in many research. Although the importance of load modeling is recognized by power system researchers and engineers, obtaining an accurate load model remains challenging due to the large …
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CMOS Power Device Modeling and Amplifier Circuits
… foundries. However, the foundry-provided BSIM-RF model is unable to accurately predict the I-V characteristics and RF behaviors (ft and fmax) of power devices with widths of several hundred microns. Therefore, an advanced large-signal model which is able to predict distributed nonlinear effects is …
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On the Circuit Oriented Average Large Signal Modeling of Power Converters and its Applications
… derive accurate and efficient Circuit Oriented Large Signal Average Models (COLSAMs) that approximate the slow dynamics manifold of the moving average values of the relevant state variables for Pulse-Width Modulated (PWM) dc to dc and three-phase to dc power converters is developed. These …
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Design, Modeling and Control of Bidirectional Resonant Converter for Vehicle-to-Grid (V2G) Applications
… energy can be transferred wirelessly over a large air-gap through inductive coupling, eliminating the physical connection between the charger and the grid. A typical on-board battery charger consists of a boost power factor correction (PFC) converter followed by a dc-dc converter. This …
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Theoretical Analysis and Design for the Series-Resonator Buck Converter
… This work develops a steady-state model of the SRB converter to calculate voltage gain, component peak voltages, and resonant inductor peak current. Each switching cycle is modeled based on the concept of generalized state-space averaging. The soft-switching condition of the …
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Active Source Management to Maintain High Efficiency in Resonant Conversion over Wide Load Range
High-frequency and large amplitude current is a driving requirement for applications such as induction heating, wireless power transfer, power amplifier for magnetic resonant imaging, electronic ballasts, and ozone generators. Voltage-fed resonant inverters are normally employed, however, …