基于IGBT的大功率变频感应式加热电源

发布时间：2018-01-19 10:10

本文关键词： 感应加热电源串联谐振软开关定导通时间控制大功率　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：感应加热电源广泛应用于各种热处理场合,但传统大功率感应加热电源多存在效率低,功率因数低等缺点,给用户和电网带来较大损失。本文以基于IGBT(Insulated Gate Bipolar Transistor,绝缘栅双极型晶体管)设计的感应加热电源为研究对象,简要阐述了其工作原理和最新发展趋势,着重分析了串联和并联两种谐振方式。通过对比分析得出,在大功率工作条件下,串联谐振能更加稳定可靠的工作。也着重分析了整流调功、斩波调功、逆变调功三种不同的功率调节方式,定性的指出,采用斩波调功对负载的适应度更高,应用更广泛。对于感应加热电源而言,工作效率是最重要的设计指标之一。然而大功率电源往往效率低下,本文针对此缺点,创新性的采用基于COT(Constant On Time,定导通时间)调制模式的软开关技术设计了电源的DC/DC部分。实验表明,此方法降低了开关损耗,并且电路能够在软开关状态下稳定工作,从而大大提高了电源的工作效率本文最终完成了10k W/20k H的工程样机的试制,达到实验预期。
[Abstract]:Induction heating power supply is widely used in various heat treatment situations, but the traditional high-power induction heating power supply has many shortcomings, such as low efficiency, low power factor and so on. This paper is based on IGBT(Insulated Gate Bipolar Transistor. The induction heating power supply designed by insulated gate bipolar transistor (IGBT) is the object of study. The working principle and the latest development trend are briefly described, and the resonant modes of series and parallel connection are emphatically analyzed. Under the condition of high power operation, series resonance can work more stably and reliably. Three different power regulation modes, rectifier, chopper and inverter, are also analyzed qualitatively. For induction heating power supply, the working efficiency is one of the most important design indicators. However, the efficiency of high-power power supply is often low. In view of this shortcoming, this paper innovatively adopts COT(Constant on Time. The DC/DC part of the power supply is designed by the soft-switching technology of fixed on-time) modulation mode. The experiment shows that the method can reduce the switching loss and the circuit can work stably in the soft-switching state. Therefore, the efficiency of the power supply is greatly improved. In this paper, the prototype of 10kW / 20kH is finished, and the experimental expectation is reached.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM924.01;TN322.8

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