ALGORITHM OF FREQUENCY REGULATION OF THE TRANSISTOR INVERTER FOR INDUCTION HEATING

An algorithm for frequency control of a resonant voltage inverter is presented when operating at an inductive load, taking into account the limitation of the frequency range by the inductive detuning necessary for the safe switching of the inverter power transistors. The structure of the analog control system of the serial generator for induction heating is considered. The links of the software implementation of the excitation and control algorithm, a mathematical model of an inverter with a resonant circuit, have been developed. The results of modeling the dynamics of the excitation and control algorithm are presented; the effect of the frequency limiting mechanism near the resonance is shown. The choice of a microcontroller with a hardware implementation of excitation and measurement nodes required for the digital implementation of the algorithm is substantiated. The structure of the software nodes of the implementation of the algorithm based on the STM32F334 microcontroller, a diagram of the laboratory layout of a half-bridge transistor inverter with control from the STM32 Nucleo-64 board, the results of debugging and testing are presented.

Authors: D. N. Bondarenko, F. V. Chmilenko, V. Y. Parmenov

Direction: Electrical Engineering

Keywords: Induction heating, transistor generator, frequency regulation, microcontroller, algorithm

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