Base On UC3879 High Frequency Induction Heating Power Source's Design

In this paper, the series resonant induction heating power supply was mainly discussed. By analyzing its load characteristics and power regulation scheme, an induction heating power supply structure with uncontrolled rectifier and phase-shift PWM power regulation strategy was selected, in which the inductive phase-shift PWM power regulation method and it's application in MOSFET power supply was particularly studied. The characteristics of phase-shift PWM control method and its full bridge soft switch realization was lucubrated. In the meantime, aiming at the complicated time-variant parameter and non-linear structure of the induction heating power supply, the close loop simulink model of phase-shift PWM induction heating power supply was established under MATALB/Simulink environment, and the system simulation research was implemented with the established model.In theory on the basis of the analysis, design 200 W/100kHz sentimental induction heating phase-shifting circuit and the main power control circuit. By the learning and understanding of the full bridge soft-switching controller UC3879, a novel phase-shifting the lock-in induction heating power shift-phase power control method, that is phase-locked loop based on UC3879 design circuit and the shift-phase power circuit matching program. Design and repeat its shock exciton Sweep switched from the start, greatly improving the success rate of the start-up power. At the same time build a 200 W/100kHz phase-shifting induction heating power experimental platform, completed a closed-loop control system, the experimental results show the correctness of this theoretical analysis and control the feasibility of the program.