Marian K. Kazimierczuk, Ph.D. (Advisor); Yan Zhuang, Ph.D. (Committee Member); Saiyu Ren, Ph.D. (Committee Member); Henry Chen, Ph.D. (Committee Member); Ray Siferd, Ph.D. (Committee Member)
Doctor of Philosophy (PhD)
In the future, renewable energy sources will be the primary energy sources due to non-renewable energy resources depletion. Having a sustainable energy source as an input voltage source for the electrical system is essential. Its applications can be widely used in hybrid solar-wind energy systems, electric vehicles, etc. This converter is invented and named after by Slobodan Cuk. An analysis describing a detailed steady-state operation of the non-isolated Cuk converter operating in continuous-conduction mode (CCM) is provided. The expected steady-state current and voltage waveforms across different components of the converter are analytically derived. Design equations for the converter are provided. The power loss of various converter components is predicted. The overall converter efficiency is derived. By using circuit averaging technique, the dc and the small-signal ac models of the non-isolated Cuk dc-dc converter operating in CCM are derived. The transfer functions of the non-isolated Cuk dc-dc converter power-stage are duty cycle-to-output voltage, input voltage-to-output voltage, output impedance, and input impedance. The component parasitics of the converter are included. Output voltage step responses to the duty cycle and input voltage step changes are provided. The time-domain and frequency-domain characteristics of the converter are analyzed by using a design example. Simulation and experimental results are provided, validating the theoretical results. This verified model responses from simulations are also validated through hardware implementation. A closed-loop voltage-mode controller for the non-isolated Cuk dc-dc converter is designed. Various frequency-domain parameters affecting the system responses are measured and compared to the open-loop system. All the theoretically obtained responses are implemented using MATLAB and experimentation.
Department or Program
Ph.D. in Engineering
Year Degree Awarded
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