At present, the research on series resonant induction heating power supply with IGBT as switching device under high power and high frequency is a hot spot and difficulty. In order to make up for the shortcomings of the control system built by analog circuit, the research on digital control of induction heating power supply is an inevitable trend. This paper takes series resonant induction heating power supply as the research object, and uses TI\'s TMS320F2812 as the control chip to realize the digitization of power control system. Firstly, the load characteristics and power regulation mode of series resonant induction heating power supply are analyzed, and the phase-controlled rectifier power regulation control mode is determined. Then, the working process of series resonant inverter under inductive and capacitive state is analyzed to determine the safe and reliable operation state of the system. This paper designs the main circuit parameters of the power supply and builds the whole system in Matlab/Simulink simulation environment. The half-voltage start-up mode, phase-locked loop frequency tracking capability and power regulation control of series resonant induction heating power supply are simulated and analyzed. Aiming at the digital control system of induction heating power supply, after discussing the working principle and research status of thyristor phase-controlled trigger and phase-locked loop, this paper analyzes in detail the realization of DSP thyristor phase-controlled pulse digital trigger and digital phase-locked loop (DPLL) based on this topic, and draws their respective advantages. At the same time, the power control strategy of induction heating power supply is analyzed, and the control method using digital PI integral separation is obtained. This paper uses TI\'s TMS320F2812 as the control chip of the system, builds the DSP peripheral hardware circuit of the control system, analyzes the operation process of the system and writes the program of the entire control system. Finally, the control system is tested to verify the correctness of the theoretical analysis and the feasibility of the control scheme.
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