- 學位論文
應用於感應加熱的串聯共振反流器設計
Design of Series Resonant Inverter for Induction Heating System
摘要
摘 要 由於環保意識抬頭，感應加熱相較於傳統直接加熱具備無環境污染及加熱速度快、安全性高…等許多優點；另一方面，隨著半導體元件製成的進步，使轉換器上的功率開關能夠操作在更高頻率的範圍，致使高頻感應加熱裝置具備了輕、薄、短、小、效率高的特色。 本篇論文採全橋式電路建構一電壓饋入式電源轉換裝置，應用於負載串聯共振式感應加熱系統之上，功率開關具備零電壓切換之性能，以達降低功率開關之切換應力、切換損失及改善電磁干擾現象，成功達到提高加熱效率之目的。加熱過程中負載之電氣特性伴隨加熱溫度的變化而改變，有鑑於此，本研究採用鎖相迴路控制技術追隨共振頻率，確保加熱系統於運作期間之效率為最佳狀態；此外，利用熱電耦之溫度感測器配合相移技術，設計出溫度回授控制功能，藉由調整工作週期來改變轉換器之輸出功率，進而精確控制加熱溫度。 最後，對本研究的感應加熱系統之其操作特性與整體效率進行說明與量測，同時成功的對多個加工物件進行加熱，並在加熱溫度變化下，負載電氣特性改變對於加熱效果做一併探討。
並列摘要
Abstract Because of improvement of environmental consciousness, compared with conventional direct heating, the induction heating has many advantages such as cleanliness, high-speed heating, safety and better heating quality . On the other aspect, with advances of the latest power semiconductor devices, the switches of inverter can operate in higher frequency ranges. Therefore, the induction-heating systems can reach small, compact, and efficient properties. In this study, a load series resonant induction heating system with voltage source full bridge inverter has been constructed and tested. The system can reach reducing switching losses, component stress, and electromagnetic interference of power semiconductor devices. Since the characteristics of load change with variations of temperature, a Phase Locked Loop (PLL) technology has adopted. By this, the heating system can operate in the most efficient state. Additionally, this research proposes a temperature control by temperature-sensing incorporating with phase-shift Pulse-Width-Modulated (PWM) technology. Finally, the operation characteristics and efficiency of the induction heating system are measured and analyzed. Besides, the change of heating efficiency under variations of load parameters due to temperature change is also studied.