基于IGBT的并联谐振感应加热电源的研究

发布时间：2018-09-19 17:31

【摘要】：感应加热电源的工业发展趋势是高频化、高效率、体积小、数字智能化、控制精确化,研究开发基于IGBT的感应加热电源已十分必要。本文以中频感应加热电源为研究对象,以IGBT为主功率开关器件,采用并联型谐振逆变拓扑,完成2kHz/60kW并联型中频感应加热电源的设计。本文首先对感应加热电源的发展现状及前景作了分析,并阐述了感应加热的基本原理。从适用于大功率应用场合的电流型并联负载谐振逆变器出发,对比了并联谐振逆变器各种调功方式的优缺点,提出采用高频Buck斩波器做为调节电源输出功率的手段。文中重点对并联谐振逆变器进行分析,对比其各工作状态,指出为保证逆变器可靠运行采用固定重叠角的控制策略,逆变器谐振负载工作在容性准谐振状态；采用基于DSP的数字锁相、频率自动跟踪控制策略,逆变器开关频率快速跟随负载固有频率的变化,谐振负载工作在所期望的弱容性准谐振状态。文中提出了一种精确计算输出功率的方法,提高了电源的输出控制精确度。本文详细阐述了并联型感应加热电源的设计过程,分析了主电路的设计方法以及关键器件的选型,控制系统采用TI公司的TMS320LF2407A DSP作为控制核心,设计了一种可靠的运行保护机制,并对电源的散热系统进行了仿真设计。在上述分析的基础上,本文成功研制出了一台功率为60kW的高性能的并联型中频感应加热电源。试验结果表明,该电源的电气性能达到了预期的指标要求,有利于提高感应加热热场的稳定性,有利于提高感应加热的谐振频率。
[Abstract]:The industrial development trend of induction heating power supply is high frequency, high efficiency, small volume, digital intelligence and accurate control. It is necessary to develop induction heating power supply based on IGBT. In this paper, if induction heating power supply is taken as research object, IGBT as main power switch device and parallel resonant inverter topology adopted to complete the design of 2kHz/60kW parallel intermediate frequency induction heating power supply. In this paper, the present situation and prospect of induction heating power supply are analyzed, and the basic principle of induction heating is expounded. Starting from the current-mode parallel load resonant inverter suitable for high power applications, the advantages and disadvantages of various power regulation modes of parallel resonant inverter are compared, and a high frequency Buck chopper is proposed as a means to adjust the output power of the power supply. In this paper, the parallel resonant inverter is analyzed, and its working states are compared. It is pointed out that the resonant load of the inverter works in the capacitive quasi-resonant state in order to ensure the reliable operation of the inverter using the control strategy of fixed overlap angle. Digital phase-locking based on DSP and frequency automatic tracking control strategy are adopted. The switching frequency of inverter follows the change of natural frequency of load quickly. The resonant load works in the expected weak capacitive quasi-resonant state. In this paper, a method to calculate the output power accurately is presented, which improves the output control accuracy of the power supply. In this paper, the design process of parallel induction heating power supply is described in detail, and the design method of main circuit and the selection of key devices are analyzed. The control system adopts TMS320LF2407A DSP of TI Company as the control core, and designs a reliable operation protection mechanism. And the emulation design of the heat dissipation system of the power supply is carried out. Based on the above analysis, a high performance parallel intermediate frequency induction heating power supply with power of 60kW has been successfully developed. The experimental results show that the electrical performance of the power supply meets the expected requirements, which is conducive to improving the stability of the induction heating heat field and the resonant frequency of the induction heating.
【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】：TM924.01

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