- 學位論文
感應加熱電路之頻率與加工物件直徑大小對於加熱速度之探討
The Study of Influence of Frequency and Work-Piece Diameter on Heating Speed for Induction Heating
摘要
由於感應加熱相較於傳統直接加熱，具備有加熱速度快、安全性高、產品品質好、幾乎無環境污染等許多優點；另一方面，隨著功率半導體元件製作技術的進步，使轉換器上的功率開關能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。 感應加熱的原理主要是利用利用電磁感應現象對金屬物件進行加熱的方式。高頻交流電源供應加熱線圈產生正負交替變化的磁場，再將磁性之導電加工物件置入加熱線圈所建立的交變磁場內，由於磁力線的切割，加工物件將於不同深淺層面產生感應渦電流，因此產生Ic2．R的電功率熱消耗，致使加工物件溫度升高。 本文採用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，並藉由相移式脈波寬度調變技術及功率變壓器漏電感之運用，讓開關元件達到零電壓切換，減少開關元件熱的消耗，提升整體電路效率。 電路各元件的選用方面：功率開關選用IRFP31N50L、PWM控制IC選用UCC3895、隔離驅動IC選用IR2110、變壓器鐵芯部分選TDK公司所生產的PC40EE55 鐵芯。 最後，探討感應加熱系統在不同加熱頻率與不同加工物件直徑之下，其操作特性與加熱速度之影響。
並列摘要
Compared with conventional direct heating, the induction heating has been widely used and rapidly developed for industrial applications, because it has many advantages such as high-speed heating, safety, high quality, cleanliness, and etc. On the other aspect, with tremendous advantage 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. The principle of the induction heating is based on a main way of utilizing a phenomenon of electromagnetic induction to heat metal devices. High-frequency alternating current feed in heating coils in order to produce an alternating magnetic field. Then, the work-piece in the magnetic field will induce eddy current to heat itself. In this study, a load series resonant induction heating system with voltage source full bridge inverter has been constructed and use phase-shift pulse width modulation to incorporate leakage inductance of the transformer to achieve zero-voltage-switching, therefore reduce the loss in switches and increase the efficiency of the system. Finally, the operation characteristics and heating performance of the induction heating system are analyzed and discussed.