在多負載下的感應加熱系統研究設計

Design of Induction Heating System under Multi-loads Condition

許榮宗(Rong-Zong Syu)

指導教授 ： 何金滿

中原大學/工學院/電機工程研究所/碩士(2007年)

https://doi.org/10.6840/cycu200700250

摘要

摘 要

由於現今環保意識提升，感應加熱相較於一般傳統電熱或瓦斯加熱方式，大部份的熱能會散溢至周圍，熱轉換效率不高，而感應加熱器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，隨著半導體晶體元件製成的進步，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操作特性與整體效率進行說明與量測，對多個加工物件同時進行加熱做測試，以單顆變壓器即可達到輸出多負載之功能，減少電路構件數目，使功率關關達到柔性切換，大幅降低開關的切換損失，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。

關鍵字

感應加熱 ； 零電壓切換

並列摘要

Abstract

Because of environmental consciousness, compared with conventional electric heating and gas heating which a large part of heat energy is lost, the induction heating has many advantages such as cleanliness, high-speed heating, high 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, this bring the induction-heating systems to reach small, compact, and high efficient .

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 stresses, and electromagnetic interference of power semiconductor devices. Since the characteristics of load change with variations of temperature, a Phase Locked Loop (PLL) technology has been 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.

並列關鍵字

induction heating ； Phase Locked Loop

參考文獻

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