【摘要】：感應(yīng)加熱電源因其節(jié)能、高效、易于控制等優(yōu)勢在工業(yè)領(lǐng)域應(yīng)用越來越廣泛。隨著電力電子技術(shù)的發(fā)展,高頻化、高精度、高效率、高功率因數(shù)和數(shù)字智能化成為了感應(yīng)加熱電源發(fā)展趨勢。本文以基于IGBT的感應(yīng)加熱電源為研究對象,完成一臺20kHz/30kW串聯(lián)型感應(yīng)加熱電源。 本文首先介紹了感應(yīng)加熱的物理基礎(chǔ)和感應(yīng)加熱電源的發(fā)展現(xiàn)狀及趨勢,對比感應(yīng)加熱電源各種調(diào)功方式和兩種典型感應(yīng)加熱電源逆變拓?fù)涞膬?yōu)缺點(diǎn),確定了Buck斬波調(diào)功和串聯(lián)諧振電壓型逆變拓?fù)涞南到y(tǒng)方案。本文重點(diǎn)對串聯(lián)諧振電壓型逆變橋控制時序、逆變橋的死區(qū)時間和功率因數(shù)角進(jìn)行研究設(shè)計(jì),采用控制逆變器工作在最佳死區(qū)時間保證電源可靠運(yùn)行,負(fù)載工作在弱感性狀態(tài)；同時,對串聯(lián)諧振負(fù)載匹配進(jìn)行了研究分析,采用可降低補(bǔ)償電容諧振電壓的電磁耦合法進(jìn)行電源負(fù)載匹配,并完成匹配變壓器的方案設(shè)計(jì)。在控制策略上,采用基于DSP控制器TMS320F28335的電壓、電流和功率閉環(huán)調(diào)功方式,實(shí)現(xiàn)更準(zhǔn)確快速的功率調(diào)節(jié)；采用電流過零檢測和數(shù)字PI控制調(diào)節(jié)方式,實(shí)現(xiàn)對負(fù)載固有頻率的自動跟蹤,從而確保在整個加熱過程中負(fù)載保持在弱感性諧振狀態(tài)。 在上述分析基礎(chǔ)之上,本文詳細(xì)闡述了串聯(lián)諧振型感應(yīng)加熱電源工作原理及設(shè)計(jì)方法,分析了主電路拓?fù)湓O(shè)計(jì)和關(guān)鍵器件選型、負(fù)載匹配方案以及系統(tǒng)損耗等關(guān)鍵問題。最終成功研制出了一臺高性能的30kW/20kHz的串聯(lián)諧振型感應(yīng)加熱電源,試驗(yàn)結(jié)果及現(xiàn)場運(yùn)行情況表明,該電源的電氣性能達(dá)到了預(yù)期目標(biāo)要求,輸出性能穩(wěn)定,功率因數(shù)高,熱穩(wěn)定性好,滿足藍(lán)寶石現(xiàn)場應(yīng)用要求。
[Abstract]:Induction heating power supply is more and more widely used in industrial field because of its advantages of energy saving, high efficiency and easy control. With the development of power electronics, high frequency, high precision, high efficiency, high power factor and digital intelligence have become the development trend of induction heating power supply. In this paper, the induction heating power supply based on IGBT is taken as the research object, and a 20kHz/30kW series induction heating power supply is completed. This paper first introduces the physical basis of induction heating and the development status and trend of induction heating power supply, and compares the advantages and disadvantages of various power regulation modes and two typical inverter topologies of induction heating power supply. The system scheme of Buck chopper power modulation and series resonant voltage source inverter topology is determined. In this paper, the control sequence of series resonant voltage type inverter bridge, the dead time and power factor angle of the inverter bridge are studied and designed. The control inverter is used to work at the best dead time to ensure the reliable operation of the power supply and the load to work in the weak inductive state. At the same time, the load matching of series resonance is studied and analyzed. The electromagnetic coupling method, which can reduce the resonant voltage of compensating capacitor, is used to match the load of power supply, and the scheme design of matching transformer is completed. In the control strategy, the voltage, current and power closed-loop power regulation mode based on DSP controller TMS320F28335 is adopted to realize more accurate and fast power regulation. The zero-crossing current detection and digital PI control are adopted to realize the automatic tracking of the natural frequency of the load so as to ensure that the load remains in a weak resonant state during the whole heating process. Based on the above analysis, the working principle and design method of series resonant induction heating power supply are described in detail. The main circuit topology design and key device selection, load matching scheme and system loss are analyzed. Finally, a series resonant induction heating power supply of high performance 30kW/20kHz is successfully developed. The test results and field operation show that the electrical performance of the power supply meets the expected requirements, the output performance is stable, and the power factor is high. Good thermal stability, meet the site application requirements of sapphire.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46;TM924.01

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