基于IGBT的串联谐振式感应加热电源的研究

发布时间：2018-11-17 14:52

【摘要】：感应加热电源因其节能、高效、易于控制等优势在工业领域应用越来越广泛。随着电力电子技术的发展,高频化、高精度、高效率、高功率因数和数字智能化成为了感应加热电源发展趋势。本文以基于IGBT的感应加热电源为研究对象,完成一台20kHz/30kW串联型感应加热电源。本文首先介绍了感应加热的物理基础和感应加热电源的发展现状及趋势,对比感应加热电源各种调功方式和两种典型感应加热电源逆变拓扑的优缺点,确定了Buck斩波调功和串联谐振电压型逆变拓扑的系统方案。本文重点对串联谐振电压型逆变桥控制时序、逆变桥的死区时间和功率因数角进行研究设计,采用控制逆变器工作在最佳死区时间保证电源可靠运行,负载工作在弱感性状态；同时,对串联谐振负载匹配进行了研究分析,采用可降低补偿电容谐振电压的电磁耦合法进行电源负载匹配,并完成匹配变压器的方案设计。在控制策略上,采用基于DSP控制器TMS320F28335的电压、电流和功率闭环调功方式,实现更准确快速的功率调节；采用电流过零检测和数字PI控制调节方式,实现对负载固有频率的自动跟踪,从而确保在整个加热过程中负载保持在弱感性谐振状态。在上述分析基础之上,本文详细阐述了串联谐振型感应加热电源工作原理及设计方法,分析了主电路拓扑设计和关键器件选型、负载匹配方案以及系统损耗等关键问题。最终成功研制出了一台高性能的30kW/20kHz的串联谐振型感应加热电源,试验结果及现场运行情况表明,该电源的电气性能达到了预期目标要求,输出性能稳定,功率因数高,热稳定性好,满足蓝宝石现场应用要求。
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46;TM924.01

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