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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 39875 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Tahami, Farzad
- Abstract:
- Nowadays, power electronics converters with pulse width modulation (PWM) are widely used in different power circuits. Operation of semi-conductive switches during on and off conditions causes switching dissipation and consequently decreases the efficiency of the PWMs. Recently, by increasing the required power for power electronics applications, quasi-resonant converters attract attentions. Quasi-resonant converters, by adding resonant circuits to the PWM converters causes the soft switching operation (switching with zero current or voltage) and decreases the energy loss. In conventional control methods of these converters, the nonlinear average circuit model is linearized around the operational conditions and a linear controller is designed for the system. This method does not work well for high amplitude perturbations and high variations of the input and the load. The goal of this dissertation is to design a controller that is applicable to a wide range of operational conditions and guaranties the system’s stability. In this study, by choosing a soft model and combining various linear and quasi-linear models, a more precise model in comparison with quasi-resonant models is obtained and an appropriate controller for these converters are designed
- Keywords:
- Pulse Width Modulation (PWM) ; Quasi-Resonant Converter ; Multiple Modeling ; Soft Selection ; Models Fusion
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