本論文擬研製一應用於感應加熱之全橋相移式負載並聯諧振換流器，其電路架構為傳統全橋換流器結合相移式脈波寬度調變技術，並利用功率變壓器之漏感及功率開關元件上之寄生電容產生諧振，設計出具零電壓切換特性之感應加熱器。而諧振電容與加熱負載形成一等效R-L-C並聯諧振電路，當電路發生諧振時，會有最大功率轉移之效果，致使加熱負載達到加熱處理之目的。本文首先介紹感應加熱之基本理論，接著對本文研究之電路之動作模式進行分析，並設計主電路功率元件之參數。最後實作出一輸入電壓500 Vdc、輸出電壓50 Vrms,ac、輸出功率2 kW及切換頻率50 kHz之雛型電路，並由實驗結果驗證本文之理論分析。

The main purpose of this thesis is to study and implement a full-bridge phase-shifted load-parallel-resonant inverter for induction heating. Zero-voltage-switching operation of all switches can be achieved with stray components of the power transformer and four power switches. Parallel resonance occurs between the load and the resonant capacitor at a resonant frequency equal to the switching frequency, which results in maximum power transfer for induction heating. In this thesis, first, the basic theory of induction heating is introduced. Second, the analysis of operating principles of full-bridge phase-shifted load-parallel-resonant inverter is performed. Then, the design procedure is described. Finally, a prototype of the inverter with input voltage 500 Vdc, output voltage 50 Vrms,ac, and output power 2 kW is implemented to verify the theoretical analysis.

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