| Summary: | 碩士 === 淡江大學 === 電機工程學系碩士班 === 97 === The main purpose of this thesis is concerned with the design of fuzzy controllers for two different kinds of DC-DC converters. Facing that the fossil fuels are exhausting on the earth and the rising agreement on environmental protection, the green energy source is considered as a part of substitution because it is environmentally-friendly and has less ecological impact than many conventional energy sources. However, the green energy is unstable and low power energy, a DC-DC converter is required to stabilize its output for further use. Therefore, this thesis deals with the design and implementation of fuzzy controllers for buck converters in parallel and boost converters. Concerning the former, a multi-phase interleaved technology is adopted so as to provide higher power output. A fuzzy controller is designed to adjust the output voltage and output current of each phase in order to obtain a stable output voltage and output currents of equal amount, which in turn prevents the circuit elements from damaging by large electric current. On the other hand, we propose a fuzzy controller design for a novel boost converter name as 2nd-order KY converter. The output voltage is stabilized and the prescribed performance specifications are satisfied. In general, the effectiveness of the proposed fuzzy controllers is verified by means of numerical simulation and experiments.
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