| Summary: | 碩士 === 國立成功大學 === 系統及船舶機電工程學系碩博士班 === 93 === Abstract
An H∞-Control design of the Pulse Width Modulator (PWM) switch buck DC-DC converter is studied in this thesis. The AC small-signal mathematical model for the PWM switch buck DC-DC converter is derived in this research and the state space equation of a topological circuit through a DC perturbation operating point is then established and linearized around the operating point. The composite model to be controlled is then composed of a AC small-signal model , a PWM transfer function and a switch transfer function. To minimize the ill-effects of the noises , disturbances and the parameter variations , the H∞-control methodolody is applied on the composite model to achieve the desired performance. Finally , computer simulations results are made to verify the feasibility and the robustness of the proposed control design under the presence of system parameter uncertainties and noises.
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