本文選題：感應(yīng)加熱 + 同步雙頻��； 參考：《清華大學(xué)》2015年碩士論文

【摘要】：感應(yīng)加熱是利用電磁感應(yīng)原理,使得金屬工件在通以交流的感應(yīng)線圈中產(chǎn)生渦流從而自身表面發(fā)熱升溫,達到對工件加熱的目的。感應(yīng)加熱技術(shù)自20世紀(jì)初應(yīng)用于工業(yè)生產(chǎn)以來,以其低能耗、高效率、清潔程度好、自動化程度高等優(yōu)點在我國的各個行業(yè)里得到了廣泛的應(yīng)用。隨著電力半導(dǎo)體器件、電路拓?fù)浣Y(jié)構(gòu)以及微處理器技術(shù)的迅速發(fā)展,感應(yīng)加熱技術(shù)不斷向大容量、高效率和智能化方向發(fā)展,目前工業(yè)領(lǐng)域中廣泛應(yīng)用的感應(yīng)加熱裝置多采用模擬控制,由于其系統(tǒng)具有可靠性低、拓展性弱的缺點,因此具有較高可靠性的全數(shù)字式控制方式成為感應(yīng)加熱領(lǐng)域一個重要的研究方向,為此本文在單逆變橋雙頻感應(yīng)加熱結(jié)構(gòu)的電源基礎(chǔ)上,研究了其數(shù)字化逆變的控制策略和方法。本文首先介紹了感應(yīng)加熱的基本原理和應(yīng)用領(lǐng)域,闡述了感應(yīng)加熱電源的發(fā)展現(xiàn)狀和未來的發(fā)展方向,并分析了單逆變橋雙頻感應(yīng)加熱結(jié)構(gòu)的工作原理和工作特性,確定了本文研究同步雙頻感應(yīng)加熱數(shù)字化逆變控制的內(nèi)容和目的。針對傳統(tǒng)模擬電路控制的缺點,本文設(shè)計了基于FPGA的全數(shù)字化逆變控制方式,確立了以數(shù)字鎖相環(huán)和數(shù)字SPWM為核心的逆變主控制電路,詳細(xì)分析了數(shù)字鎖相環(huán)的構(gòu)成及各個模塊的設(shè)計方式和原理,研究了正弦脈沖調(diào)制中數(shù)字波形發(fā)生器、比較器和死區(qū)時延的設(shè)計原理,最終形成了在復(fù)合諧振電路基礎(chǔ)上進行雙頻頻率跟蹤的控制策略。在理論分析的基礎(chǔ)上,文中應(yīng)用Verilog HDL軟件語言在Quartus II仿真平臺上對數(shù)字鎖相環(huán)和數(shù)字SPWM進行了底層模塊設(shè)計與仿真驗證,通過仿真波形驗證了鎖相環(huán)和SPWM設(shè)計方法的正確性。同時,在現(xiàn)有的MOSFET高頻感應(yīng)加熱電源樣機實驗平臺上,搭建了同步雙頻感應(yīng)加熱的開環(huán)電路和閉環(huán)電路,分析和討論了實驗結(jié)果,驗證了數(shù)字化逆變控制的可行性。最后,從理論研究、仿真分析、實驗驗證三個方面對單逆變橋同步雙頻感應(yīng)加熱電源的數(shù)字化逆變控制策略進行了總結(jié)和討論,針對數(shù)字化逆變控制模塊設(shè)計中存在的逆變工作頻率跟蹤精度不夠的問題進行了說明,也對未來研究中可改進的方面進行了探討。
[Abstract]:Induction heating is based on the principle of electromagnetic induction, which makes metal workpiece produce eddy current in the inductive coil with alternating current, thus heating up the surface of the metal workpiece to achieve the purpose of heating the workpiece. Since its application in industrial production in the early 20th century, induction heating technology has been widely used in various industries in China because of its advantages of low energy consumption, high efficiency, good degree of cleanliness and high degree of automation. With the rapid development of power semiconductor devices, circuit topology and microprocessor technology, induction heating technology continues to develop in the direction of large capacity, high efficiency and intelligence. At present, the induction heating devices widely used in the industrial field mostly adopt analog control. Because of its low reliability and weak expansibility, Therefore, full digital control with high reliability has become an important research direction in the field of induction heating. The control strategy and method of digital inverter are studied. In this paper, the basic principle and application field of induction heating are introduced, the present situation and future development direction of induction heating power supply are described, and the working principle and characteristics of single-inverter bridge dual-frequency induction heating structure are analyzed. The content and purpose of digital inverter control of synchronous dual frequency induction heating are determined in this paper. Aiming at the shortcoming of the traditional analog circuit control, this paper designs the full-digital inverter control mode based on FPGA, and establishes the main inverter control circuit with digital phase-locked loop and digital SPWM as the core. The structure of digital phase-locked loop (DPLL) and the design methods and principles of each module are analyzed in detail. The design principles of digital waveform generator, comparator and dead-time delay in sinusoidal pulse modulation are studied. Finally, the control strategy of dual frequency tracking based on compound resonant circuit is formed. On the basis of theoretical analysis, the digital phase-locked loop and digital SPWM are designed and verified by using Verilog HDL on Quartus II simulation platform. The correctness of the design method of phase-locked loop and SPWM is verified by simulation waveform. At the same time, the open loop circuit and closed loop circuit of synchronous dual frequency induction heating are built on the experimental platform of MOSFET high frequency induction heating power supply. The experimental results are analyzed and discussed, and the feasibility of digital inverter control is verified. Finally, the digital inverter control strategy of synchronous dual-frequency induction heating power supply with single inverter bridge is summarized and discussed from three aspects: theoretical research, simulation analysis and experimental verification. In this paper, the problem that the tracking accuracy of the inverter working frequency is not enough in the design of the digital inverter control module is explained, and the improvement aspects in the future research are also discussed.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM464

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