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.
Results
Showing 1 to 20 of 33 for “"small-signal analysis"”.
-
Small-signal analysis of parallel power converters
A small-signal analysis and modelling approach is developed for parallel power converter modules. The small-signal model of parallel buck converter modules is developed in detail to demonstrate the modelling approach. It is shown that a multiple power converter module system can be reduced to an …
-
Small signal analysis of nonlinear systems with periodic operating trajectories
A new method for small-signal analysis of switching power converters is developed and implemented in a computer program. The method is derived for systems where the nonlinearities can be described by elements that can take on one of two values, based upon a controlling variable. Another requirement …
-
Small-signal analysis and design of a distributed power system
A small-signal analysis of a two-stage distributed power system is performed. Although the distributed power system is composed of conventional PWM converters, the analysis methods can be extended to systems using other converter topologies. The analysis focuses on two important features of a …
-
Small-signal analysis of the phase-shifted zero-voltage switched PWM converter
… on the converter dynamics are analyzed. The small-signal model is derived incorporating the effects of phase-shift control and the utilization of transformer leakage inductance and power FETs junction capacitances to achieve zero-voltage resonant switching. The thesis explains the differences …
-
Small-signal Analysis and Design of Constant-on-time V2 Control for Ceramic Caps
… such as ceramic caps are preferred due to small size and small output voltage ripple requirement. However, for the converters with ceramic caps, the conventional V2 control suffers from the sub-harmonic oscillation due to the lagging phase of the capacitor voltage ripple relative to the …
-
Small signal analysis of power systems: Eigenvalue tracking method and eigenvalue estimation contingency screening for DSA
Two aspects of small signal analysis of power systems are investigated in this dissertation. The first part presents the eigenvalue tracking method for power system stabilizer (PSS) placement. Traditional methods for determining PSS placements are based on the analysis of the interconnected system. …
-
Computer-aided modeling and simulation of switching regulators
… can be configured. Unified models for large-signal and small-signal analysis are developed in user-friendly manner. Analysis capabilities of switching regulator model are demonstrated using EASYS software program.
-
Theory and Modelling of Wavelength Tunable Laser Transmitters With Enhanced Tuning Range and Their Modulation Performance
… tuning and direct Intensity Modulation (IM) (small-signal analysis). Two software simulation tools were used to model the TLDs and investigate their operation, Crosslight PICS3D and VPI (Virtual Photonics Incorporated). Two different Free-Carrier (FC) contributions to the refractive index …
-
Switching Dynamics in Ferroelectric Hf₀.₅Zr₀.₅O₂ Devices: Experiments and Models
… over a broad range of frequencies using large-signal and small-signal analysis. In large-signal analysis, a Finite-Difference implementation of the Nucleation Limited Switching model (FD-NLS) is introduced, which accurately predicts the FE circuit dynamics across a wide range of time scales. …
-
A Comprehensive Study of Hybrid Vertical -Cavity Surface -Emitting Lasers
… response of the VCSEL derived through small signal analysis, with good agreement. For the two single mode structure wafers measured, the VCSELs with the implant aperture located farther away from the active region had the better response. The capacitance of the high speed structure …
-
Active power ancillary service provision of commercial building energy storage resources
… the proposed control methods are evaluated using small-signal analysis, simulation case studies, and experimental verifications. An alternative power system for commercial buildings is designed using steady-state and dynamic models of power converters and corresponding controllers. A dynamic model …
-
Comparative analysis of analog LDO design
… compensation schemes and power supply rejection analysis. This thesis discusses different analog LDO topologies and analyzes how they achieve stability using small signal analysis and related equations. The power supply rejection (PSR) of a different error amplifier and pass device has been …
-
Modeling and Control of a Synchronous Generator With Electronic Load
Design and analysis of a system consisting of a variable-speed synchronous generator that supplies an active dc load (inverter) through a three-phase diode rectifier requires adequate modeling in both time and frequency domain. In particular, the system's control-loops, responsible for stability …
-
Modeling and Design of a Monolithic High Frequency Synchronous Buck with Fast Transient Response
… Efficient performance, high functionality, small profile, fast transient and low cost are the most wanted features for modern power management ICs, especially for mobile power. In order to reduce profile, the number of external components should be as small as possible, which means that …
-
Extended describing function method for small-signal modeling of resonant and multi-resonant converters
… function method is proposed as a systematic small-signal modeling approach to nonlinear switching circuits. This method offers significant simplification upon the previous work on using the multi-variable describing functions to treat the circuit nonlinearities. As an extension to the …
-
Zero voltage switching flyback and forward converter topologies
… employ an auxiliary circuit, with only a few small components and switching devices, to achieve ZVS of the main switch. Steady state analyses are performed and show that the proposed topologies have the following merits: lossless switching of the main switch independent of the line and load …
-
Design, Analysis and Implementation of Multiphase Synchronous Buck DC-DC Converter for Transportable Processor
… voltage to the processor. In this thesis, an analysis of power loss is derived to estimate the efficiency and switching frequency, three widely current sensing methods are discussed, two methods to compensate for the thermal resistance in loss less current sense methods are proposed, the …
-
Modeling and Analysis of a Dc Power Distribution System in 21st Century Airlifters
… from the nonlinear PDS model for stability analysis and control design. The PDS model was used to examine the system stability and the DC bus power quality under bidirectional power flow conditions. Small-signal analysis techniques were employed to study stability issues resulting from …
-
Computer Modeling and Simulation of Power Electronics Systems for Stability Analysis
… set conditions for safe operation. The stability analysis of this type of power systems has been approached using time domain simulations. There are three types of stability analysis that are studied: steady-state, small-signal analysis and large signal analysis. The steady-state stability …
-
Output Impedance Modeling and Measurement of a 28 kW Synchronous Generator
… for studying their stability. In this thesis, a small-signal analysis is done on the d-q frame for the AC SM. Starting from formulating the SM's abc frame equations, a d-q transformation is done based on the SM rotor frame so that the inductance from the abc frame representation will be fixed. …
Page 1 of 2