基于dsPIC的串聯(lián)諧振式中頻感應(yīng)加熱電源研究
[Abstract]:With the development of power electronic technology, induction heating has been widely used in industry. At the same time, the requirement of reliability and efficiency of induction heating power supply is also increasing. Digital control is an important means to improve the performance of induction heating power supply. In this paper, the digital control of series resonant intermediate frequency induction heating power supply is studied with dsPIC as the control core. This paper introduces the basic principle, application and advantages of induction heating, its development status and trend. Based on the analysis and comparison of the main circuit structure and control scheme of several kinds of common induction heating power supply, The system structure of series resonant intermediate frequency induction heating power supply is determined. The rectifier circuit adopts three-phase non-controlled rectifier and the inverter circuit adopts single-phase full-bridge inverter structure. The working characteristics of series resonant load, phase-shifted PWM power modulation and the working mode and process of inverter circuit are studied. The working principle of phase-locked loop and the method of phase difference measurement in frequency tracking technology are explained. The common realization methods of power source startup are analyzed. The defects of conventional digital PID control in induction heating power supply system are analyzed. Based on the fuzzy control principle, two kinds of compound control strategies, FUZZY-DPLL and FUZZY-PI, are adopted. In the realization of frequency tracking, frequency and phase correction are carried out according to the measured phase difference and the FUZZY-DPLL piecewise composite control. The phase difference is obtained by the input capture module of dsPIC and the fast Fourier transform (FFT). In the realization of power regulation, according to the principle of phase-shifted PWM power regulation, the phase shift angle is calculated by using the FUZZY-PI piecewise composite control, and the fuzzy adaptive PID tuning control is used in the digital PI control to adjust the control parameters. In addition, according to the load current detection value and DDS technology, the power source startup problem is solved by frequency sweep program. Finally, the hardware design and software design of the series resonant intermediate frequency induction heating power supply are carried out based on dsPIC33EP32MC202, and the simulation model and experimental platform are built according to the design content. The control strategy for the key problems such as system frequency tracking and power regulation is debugged and analyzed. The simulation and experimental results show that the design of the control system is reasonable and feasible, which lays a good foundation for the further digital research of the induction heating power supply in the future.
【學(xué)位授予單位】:蘭州理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM924.01;TM46
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