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 67 for “"small signal model"”.
-
A new small-signal model for current-mode control
A new small-signal model is developed for pulse-width-modulated converters operating with current-mode control. Four different control schemes are analyzed, all of which use the instantaneous value of the inductor current as part of the control modulation. Continuous-conduction mode and …
-
Modeling and Implementation of Controller for Switched Reluctance Motor With Ac Small Signal Model
… nature of the SRM. In this thesis, the ac small signal modeling technique is proposed for linearization of the SRM model such that a conventional PI controller can be designed accordingly for the PWM current controller. With the linearized SRM model, the duty-cycle to output transfer …
-
Design and implementation of Silicon-Carbide-based Four-Switch Buck-Boost DCDC Converter for DC Microgrid Applications
… current mode(DCM) control. Although the small signal model has been derived for FSBB under CCM control, the small ripple approximation that was previously used in the CCM model no longer applies in the QCM model and causing the model to be different. To aid the control system compensator …
-
Analysis and design of multiple-output forward converter with weighted voltage control
This work presents the modeling and analyses of multiple-output forward converters with weighted voltage control. Based upon the analyses, the systematic design methodologies and design tools are provided. A power stage de model including all the major parasitics, which are detrimental to the …
-
Gallium Nitride-Based HEMT Devices Modeling and Performance Characterization
… 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 signal …
-
Small -Signal Distributed FET Modeling
… a distributed field-effect transistor (FET) small-signal model that is accurate from do to 110 GHz for a wide range of bias conditions. The distributed model is intended to be compatible with a large-signal implementation. The distributed model performance is compared with that of a standard …
-
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 …
-
Harmonic Reduction IN a Single-Switch Three-Phase Boost Rectifier With Harmonic-Injected PWM
… and EMI filter design are discussed. An average small- signal model based on the equivalent multi-module model is developed and experimentally verified. The variations of the small-signal model against load are demonstrated, and the compensator design is discussed. The results show that at no …
-
Some design consideration of switching regulator using current-injected control
… switching regulator is performed using a small signal model containing a power stage, an error processor and a duty cycle pulse modulator. Two design constraints and the effects of various critical control circuit parameters are pinpointed and the analysis-based design guidelines are …
-
Single-switch three-phase zero-current-transition rectifier with power factor correction
… detail, and design guidelines are provided. The small signal model of the circuit is developed, and voltage mode control is designed. The results are verified on a 4 kW, 50 kHz, experimental ZCT rectifier with an IGBT; total harmonic distortion below 9% and efficiency above 95% were obtained.
-
Modeling and control of zero-voltage transition three-phase PWM boost rectifier
Average and small signal modeling of zero-voltage transition three-phase boost rectifier is performed. The effect of ZVT is introduced in the existing model for the three-phase boost rectifier using the time-averaging equivalent circuit approach. The small signal model is derived from the average …
-
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 …
-
Submicron Scaling in Indium Phosphide/indium Gallium Arsenide Single Heterojunction Bipolar Transistors
… regime were identified and analyzed. A unique small-signal model extraction procedure was developed and used to study base resistance scaling in submicron HBTs. A measurement-based analysis technique was developed to quantitatively describe the current spreading phenomenon in submicron InP HBTs …
-
Modeling and control of three-phase PWM converters
Switching and average models are developed for major three-phase PWM converters. The models are correct for the case when the voltage sources or capacitors with nonzero parasitic resistances are placed across the converter dc port or ac terminals. The effects of the parasitic resistances are …
-
Development of high-speed P-i-N photodetector for 50Gb/s optical link in data centers
… work is the design, fabrication, measurement and modeling of high-speed GaAs P-i-N photodiodes operating at 50Gb/s. The material structure and device scaling are determined through microwave analysis and simulation. Photodiodes of 20um aperture diameter is fabricated and subsequently …
-
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 …
-
Analysis and design of a novel controller architecture and design methodology for speed control of switched reluctance motors
… established and analyzed based on the linearized small signal model of the switched reluctance motor. This unique control methodology is simple and provides a starting point for further research into speed/current controller parameter design for switched reluctance motors. The analysis, design and …
-
Unified Large And Small Signal Discrete-space Modeling For Pwm Converters In Ccm
In this Thesis a Unified Discrete State-Space Model for power converters in CCM is presented. Two main approaches to arriving at the discrete model are used. The first approach involves an impulse function approximation of the duty cycle modulations of the converter switches , and this approach …
-
Analysis and Design of High-Intensity-Discharge Lamp Ballast for Automotive Headlamp
… halogen headlamps with the newly introduced small-wattage metal halide HID lamps. However, this lamp demands a highly efficient ballast and very complex control circuitry that can achieve fast turn-on and different regulation modes during the lamp start-up process. Due to the complex lamp v-i …
-
Modeling and Design of Digitially Controlled Voltage Regulator Modules
… There are several papers talking about the small signal models of the digital voltage mode control. These models are valid only if all the delay terms are known exactly since each delay is considered separately. Actually, this process is not easy. Moreover, there is no literature talking …
Page 1 of 4