Research Of 50kHz IGBT Series Resonance Induction Heating Power Supply

At present take IGBT as the switch component's series resonance induction heating power source in the high efficiency and the high frequency under research is a hot spot and the difficulty. To cover the control system's insufficiency which uses the analogous circuit, the research of induction heating power digital control is the inevitable trend. In this article take the series resonance induction heating power supply as the object of study, mainly realizes the power source control system's digitization using TMS320F2812 of TI Corporation.The phase control rectifier as the power control mode and the system safety reliable running status had been determined in the article through the analysis. The overall system had been built under the simulation environment of Matlab/Simulink in this article. The series resonance induction heating under power half voltage start pattern and phase-locked loop frequency track capacity and the power control had been analyzed though the simulation.In view of induction heating power's digital control system, the work principle and the research present situation of phase control trigger of thyristor and phase-locked loop had been discussed in this article. Thyristor digital pulse triggering and the digital phase-locked loop (DPLL) in detail based on the DSP had been analyzed, and obtains them respective superiority. The induction heating power supply control strategy had been analyzed, and the control method of the digital PI the integral separation had been used. In this article TI Corporation's TMS320F2812 to take system's control chip had been used, control system's DSP periphery hardware circuit had been built, and overall system's procedure had been compiled though analyzed the system's work process. Finally the experiment of the control system has been carried, and confirmed the theoretical analysis accuracy and the control strategy feasibility.