| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 90 === In recent years, there are two different approaches to fulfill functions of an AC/AC converter for producing variable AC outputs in power electronics. The first one is to rectify the AC input into DC quantity then to invert the DC quantity into an AC wave. Because of involving two power-stage conversions, the energy loss is high and the controller circuit is complex. The second one is a single power-stage conversion that can obtain an adjustable AC output directly. The method we used in the thesis is based on the latter approach.
The principle of single power-stage conversion is to control the switches of the converter by PWM to produce AC outputs with a fundamental frequency. A filter is used to eliminate the high-frequency noise. In this thesis, we propose an AC/AC boost converter consisting of two bi-directional AC switches, one storage inductor and one output filter capacitor. By adopting the PWM control, it can achieve the goal of an adjustable, fixed-frequency AC sine wave output from the main AC source directly. Also, we have derived a mathematical model of the steady-state equivalent circuit and proposed a novel switching technique. The proposed switching technique can avoid current spikes and provide an inductive current path to avoid voltage spikes for the communication problem. In the end, we present the simulation results and implement a single-phase AC/AC boost converter prototype circuit to verify the theoretical analysis.
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