基于DSP的高频感应加热电源的仿真研究

发布时间：2018-05-27 06:24

本文选题：感应加热 + 频率跟踪　；参考：《辽宁工业大学》2014年硕士论文

【摘要】：感应加热技术是利用交变磁场在加热工件内部产生涡流对金属器件加热的一种热处理技术。感应加热电源作为感应加热设备的主要电能转换装置，其输出功率随着生产的需要越来越大，其频率调节也越来越智能化。感应加热电源一方面要求其功率器件的损耗尽量小，另一方面要求其功率和频率具有快速调节的能力。本文分别针对频率跟踪技术和功率调节技术这两方面做了大量研究。高频感应加热电源的逆变器工作频率需要实时跟踪负载固有谐振频率。本文首先分析了感应加热电源负载的等效电路，计算了不同谐振电路中的负载固有谐振频率。然后基于电压型串联谐振逆变器，分析了感应加热电源在容性、感性和阻性不同工作状态下的逆变器运行情况，确定了小感性准谐振工作状态作为感应加热电源的可实现的理想工作状态。在小感性准谐振工作状态下，逆变器的频率需要实时跟踪负载谐振固有频率，工程中采用锁相环来实现这一功能，本文利用MATLAB/simulink搭建了定时锁相技术和定角锁相技术的模型，对两种锁相控制技术进行了分析比较，确定了以定角锁相控制技术实现电源逆变器频率对负载固有谐振频率的追踪。传统的模拟锁相环跟踪性能差，，锁相范围小，电路精度低，不能实现逆变器死区时间的实时调节。数字处理芯片不仅具有处理速度快，数据精度高的优点，而且其内部集成了多个PWM波形生成模块，能够同时产生多路PWM信号。本文利用数字信号处理芯片搭建基于PI调节的数字锁相环（PI-DPLL）模块使逆变器能够更快地追踪负载谐振频率，实现逆变器死区时间的在线调整。同时对基于Buck斩波的双闭环功率调节方式进行了研究，通过调节Buck电路的导通占空比调节逆变器输入电压，进而调节电源的输出功率。
[Abstract]:Induction heating is a kind of heat treatment technology which uses alternating magnetic field to produce eddy current inside the heating workpiece to heat metal device. As the main power conversion device of induction heating equipment, the output power of induction heating power supply is increasing with the need of production, and its frequency regulation is becoming more and more intelligent. On the one hand, the power loss of induction heating power supply is required to be as small as possible, on the other hand, the power and frequency of induction heating power supply are required to be adjusted quickly. In this paper, the frequency tracking technology and the power regulation technology have done a lot of research. The inverter frequency of high frequency induction heating power supply needs to track the inherent resonance frequency of load in real time. In this paper, the equivalent circuit of the load of induction heating power supply is analyzed, and the inherent resonant frequency of the load in different resonant circuits is calculated. Then, based on the voltage source series resonant inverter, the operation of induction heating power supply under different working conditions, such as capacitive, inductive and resistive, is analyzed. The small inductive quasi-resonant working state is determined as the ideal working state of induction heating power supply. In the condition of small inductive quasi-resonant operation, the frequency of inverter needs to track the natural frequency of load resonance in real time. In engineering, the phase-locked loop is used to realize this function. In this paper, the models of timing phase-locked technology and fixed-angle phase-locking technology are built by using MATLAB/simulink. The two kinds of phase-locked control techniques are analyzed and compared, and the fixed angle phase-locked control technology is used to track the natural resonant frequency of the load by the frequency of the inverter. The traditional analog PLL has poor tracking performance, small phase-locked range and low circuit precision, so it can not realize the real-time adjustment of dead time of inverter. Digital processing chip not only has the advantages of fast processing speed and high data precision, but also integrates several PWM waveform generation modules, which can generate multiple PWM signals simultaneously. In this paper, the PI-DPLL module based on Pi regulation is built by using digital signal processing chip to make the inverter track the resonant frequency of the load more quickly and realize the on-line adjustment of the dead time of the inverter. At the same time, the dual-closed-loop power regulation method based on Buck chopper is studied. The input voltage of inverter is adjusted by adjusting the turn-on ratio of Buck circuit, and then the output power of power supply is adjusted.
【学位授予单位】：辽宁工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM924.01

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