本文旨在研製一多階步進電壓之變流器系統，此系統可應用在非接觸式電能傳輸之激勵電源上。由一降壓轉換器產生多組直流電壓，作為後級七階變流器之輸入源，隨後轉成高頻交流類正弦之輸出電壓，此變流器優點在於輸出諧波失真與dv/dt低。由於全橋諧振變流器會因為次級側反射至初級側的反射阻抗，導致諧振槽特性改變，因而難以操作在諧振點上。若是由步進電壓變流器產生類正弦交流電，可直接驅動初級側線圈，也不需要採用諧振電路。此變流器以諧波控制之觀念設計輸入電壓源比例，消除部分諧波成份，且當階數越高，消除諧波成份越多。本文實作變流器之控制端以數位信號處理器dsPIC30F4011做控制。五階變流器與七階變流器，驗證其輸出與頻譜是否符合理論分析。

This thesis is aimed to investigate a multi-level step-voltage inverter, which can be applied to the exciting system of contactless power transmission. Multiple DC voltages are generated as the input sources for the seven-level stepped-voltage inverter by a buck converter, and then the inverter can obtain high-frequency AC output voltage. The advantages of the inverter are low output harmonic distortion and low dv/dt. Since the full-bridge resonant inverter is too difficult to operate at resonant frequency due to the reflection impedance that reflected to the primary side. The system utilizes stepped-voltage inverter. It can drive the primary side coil directly, and the resonant circuit is no necessary. The input voltage source ratios of the multilevel inverter have been designed with the concept of harmonic control. It eliminates certain harmonics, and more harmonics are eliminated as the step increases. It utilizes the digital signal processor(DSP) as the controller. This thesis is implemented a five-level stepped-voltage inverter and a seven-level stepped-voltage inverter to verify whether the output and spectrum are consistent with the analysis.

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