| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 92 === Current sensorless control for converters is an observer-based method that provides
the output regulation without using current sensors. At beginning, we utilize Averaging
Method for One-Time-Scale Discontinuous System (AM-OTS-DS) to derive the models of
buck converters and
flyback converters. In order to achieve zero steady-state regulation
error and robust performance, an integral-type controller is proposed. In this thesis, we
propose three observer-based control schemes to deal with regulation problem of buck
converter and
flyback converter. These schemes include i) Basic fuzzy tracking control;
ii) Tracking control scheme with simpli ed design method; and iii) Stabilization scheme
via coordinate translation. The stability of the overall closed-loop systems is rigorously
analyzed using Lyapunov method. Based on a mild assumption, the separation principle
still succeeds in these control problems. Hence, the control gains and observer gains can
be separately obtained by solving LMIs. The hardware of the conventional PWM buck
converter and
yback converter are implemented. The fuzzy observer-based controller
is realized by DS1103 and SIMULINK. Experiment results verify the feasibility of the
proposed schemes and illustrate nice performance for the power converters.
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