Study on application and realization of integrated control to medium-frequency induction heating

A integrated control strategy for medium-frequency (ME) induction heating system is presented in this paper. The output power regulation of ME-induction heating system used repetitive-Fuzzy PID integrated control, which can enhance the ability of the control system to withstand the parameter variations and nonlinear uncertain disturbances, and improve the dynamic characteristic of the control system; the digital phase-locked loop (DPLL) was applied to control the output frequency of ME-induction heating, which reduce the losses of switching components and improve the efficiency of the overall control system. The experimental results show that the proposed control scheme can endow the ME-induction heating power supply system with good steady state and dynamic performance and the power modulation control system can keep better precise control quality, output power adjustment quickly, high output power factor and verify the validity of the proposed integrated control strategy.