| Summary: | 碩士 === 朝陽科技大學 === 資訊工程系 === 102 === A new closed-loop scheme of 2-stage 4-phase switched-capacitor (SC) boost DC-AC inverter is proposed by combining 4-phase phase generator and sinusoidal pulse-frequency-modulation (SPFM) controller for low-power step-up inversion and regulation. In this SC inverter, the power part of the inverter is composed of 2-stage 4-phase SC booster and DC-link inverter. This SC booster contains 2 pumping capacitors and 4 switches operation for boosting the step-up gain up to 22 = 4 at most. For improving total harmonic distortion (THD), a 4x/3x/2x/1x selector is presented to select a proper gain in order to make the maximum of the practical output close to the desired output voltage as much as possible. The DC-link inverter like H-bridge structure consists of 4 switches controlled by SPFM to realize full-wave DC-AC operation. Besides, the SPFM is employed for the closed-loop realization to enhance the output realization capability for the different output peak and frequency. Finally, the 2-stage 4-phase SC boost inverter is simulated by OrCAD, and all results are illustrated to show the efficacy of the proposed scheme.
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