實現具定電流之相移全橋串聯諧振式感應加熱器

Implementation a Phase-Shift Full-Bridge Series Resonant for Induction Heater with Constant Current

林冠勳(Guan-Syun Lin)

指導教授 ： 陳政裕

國立虎尾科技大學/電機資訊學院/電機工程系碩士班/碩士(2017年)

摘要

隨著科技發展各種工業產品品質要求日趨嚴謹，感應加熱系統相較於傳統加熱技術以可燃物質作為媒介對物體直接加熱，具有精準的溫度控制、加熱過程迅速、局部加熱且集中、不受環境限制、汙染指數降低、加熱系統簡單及高效率、低成本而備受矚目，並逐漸被廣泛應用在金屬加工、焊接、溶解及半導體表面處理等製程工業上。隨著電路中操作頻率的提高，開關元件在切換時所產生的切換損失問題會更加嚴重，為了減少高頻操作下所導致的開關損耗，諧振式轉換器引起人們的興趣與關注。本論文實現具定電流之相移全橋串聯諧振式感應加熱器，其電路架構由電壓饋入式直流電源及全橋串聯諧振式感應加熱所構成。藉由相移式脈波寬度調變技術達到零電壓之切換，以減少開關元件承受應力及切換損失，將可延長開關元件之壽命、改善整體系統的可靠度及效率。因應加熱物件變動時所造成的輸出電流變化，藉由負回授電流控制方式，使系統操作頻率追隨諧振頻率做變化，確保開關功率元件為零電壓之切換，並達成輸出電流恆定之目標。並採用UCC3895相移式脈波寬度調變控制IC可送出所需的控制訊號，以產生兩組上下臂互補項移 角度之開關驅動訊號。最後，藉由實驗波形的驗證，證明所提之感應加熱器於加熱物件變動下，藉由變頻控制，確保開關元件皆能完成零電壓之切換並維持恆定電流輸出。

關鍵字

感應加熱 ； 串聯諧振換流器 ； 相移式脈波寬度調變 ； 零電壓切換諧振換流

並列摘要

Recently, the induction heater has been widely used and rapidly developed for industrial applications. It has a lot of advantages, including more accurate and user-friendly temperature control system, better heating performance, cleaner heating environment with higher efficiency and lower cost. In addition, it is desirable to reduce the size of reactive components within power supplies for modem computing systems. The solution to reducing high switching losses resulting from higher frequency operation, may lie in resonant power conversion. Here, we propose an implementation for induction heater with constant current using a phase-shift full-bridge series resonant. This induction heater consists of a DC voltage-fed power supply for full-bridge series resonant induction heating system. Compared with the traditional pulse width modulation induction heater, our proposed induction heater uses a phase-shift pulse width modulation technology with zero-voltage switching to reduce the switching stress and loss. A negative feedback current control system was used to achieve a high-efficient power converter to cope with loading changes of output current. Furthermore, an UCC3895 phase shift pulse width modulation control IC was used for switching signals generated from two complementary phase shift of angle α. Finally, the circuit of this project used a negative feedback control system with constant output current to regulate loading changes. The experimental results were presented to verify the feasibility of the proposed induction heater.

並列關鍵字

Induction heating ； series resonant inverter ； phase-shift pulse width modulation ； zero-voltage switching resonant inverter

參考文獻

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