本文選題：感應加熱 + 頻率跟蹤　； 參考：《遼寧工業(yè)大學》2014年碩士論文

【摘要】：感應加熱技術是利用交變磁場在加熱工件內部產生渦流對金屬器件加熱的一種熱處理技術。感應加熱電源作為感應加熱設備的主要電能轉換裝置，其輸出功率隨著生產的需要越來越大，其頻率調節(jié)也越來越智能化。感應加熱電源一方面要求其功率器件的損耗盡量小，另一方面要求其功率和頻率具有快速調節(jié)的能力。本文分別針對頻率跟蹤技術和功率調節(jié)技術這兩方面做了大量研究。 高頻感應加熱電源的逆變器工作頻率需要實時跟蹤負載固有諧振頻率。本文首先分析了感應加熱電源負載的等效電路，計算了不同諧振電路中的負載固有諧振頻率。然后基于電壓型串聯諧振逆變器，分析了感應加熱電源在容性、感性和阻性不同工作狀態(tài)下的逆變器運行情況，確定了小感性準諧振工作狀態(tài)作為感應加熱電源的可實現的理想工作狀態(tài)。在小感性準諧振工作狀態(tài)下，逆變器的頻率需要實時跟蹤負載諧振固有頻率，工程中采用鎖相環(huán)來實現這一功能，本文利用MATLAB/simulink搭建了定時鎖相技術和定角鎖相技術的模型，對兩種鎖相控制技術進行了分析比較，確定了以定角鎖相控制技術實現電源逆變器頻率對負載固有諧振頻率的追蹤。 傳統(tǒng)的模擬鎖相環(huán)跟蹤性能差，，鎖相范圍小，電路精度低，不能實現逆變器死區(qū)時間的實時調節(jié)。數字處理芯片不僅具有處理速度快，數據精度高的優(yōu)點，而且其內部集成了多個PWM波形生成模塊，能夠同時產生多路PWM信號。本文利用數字信號處理芯片搭建基于PI調節(jié)的數字鎖相環(huán)（PI-DPLL）模塊使逆變器能夠更快地追蹤負載諧振頻率，實現逆變器死區(qū)時間的在線調整。同時對基于Buck斬波的雙閉環(huán)功率調節(jié)方式進行了研究，通過調節(jié)Buck電路的導通占空比調節(jié)逆變器輸入電壓，進而調節(jié)電源的輸出功率。
[Abstract]:Induction heating is a kind of heat treatment technology which uses alternating magnetic field to produce eddy current inside the heating workpiece to heat metal device. As the main power conversion device of induction heating equipment, the output power of induction heating power supply is increasing with the need of production, and its frequency regulation is becoming more and more intelligent. On the one hand, the power loss of induction heating power supply is required to be as small as possible, on the other hand, the power and frequency of induction heating power supply are required to be adjusted quickly. In this paper, the frequency tracking technology and the power regulation technology have done a lot of research. The inverter frequency of high frequency induction heating power supply needs to track the inherent resonance frequency of load in real time. In this paper, the equivalent circuit of the load of induction heating power supply is analyzed, and the inherent resonant frequency of the load in different resonant circuits is calculated. Then, based on the voltage source series resonant inverter, the operation of induction heating power supply under different working conditions, such as capacitive, inductive and resistive, is analyzed. The small inductive quasi-resonant working state is determined as the ideal working state of induction heating power supply. In the condition of small inductive quasi-resonant operation, the frequency of inverter needs to track the natural frequency of load resonance in real time. In engineering, the phase-locked loop is used to realize this function. In this paper, the models of timing phase-locked technology and fixed-angle phase-locking technology are built by using MATLAB/simulink. The two kinds of phase-locked control techniques are analyzed and compared, and the fixed angle phase-locked control technology is used to track the natural resonant frequency of the load by the frequency of the inverter. The traditional analog PLL has poor tracking performance, small phase-locked range and low circuit precision, so it can not realize the real-time adjustment of dead time of inverter. Digital processing chip not only has the advantages of fast processing speed and high data precision, but also integrates several PWM waveform generation modules, which can generate multiple PWM signals simultaneously. In this paper, the PI-DPLL module based on Pi regulation is built by using digital signal processing chip to make the inverter track the resonant frequency of the load more quickly and realize the on-line adjustment of the dead time of the inverter. At the same time, the dual-closed-loop power regulation method based on Buck chopper is studied. The input voltage of inverter is adjusted by adjusting the turn-on ratio of Buck circuit, and then the output power of power supply is adjusted.
【學位授予單位】：遼寧工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM924.01

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