Abstract
The medium frequency induction furnace power control system of industrial grade includes the microcontroller STC89C52RC, power converters, data amplifiers, analog to digital converter, stepper motor and excitation regulator, etc. The medium frequency generator’s output voltage and current signals are passed to the power converter to transform the millivolt DC signal into a linear relationship. The outputs from the power amplifier controlled by the data conversion single-chip are input through the ADC. The signals are compared with the power base value set by the user to calculate the control commands, to control the stepper motor action and control the stepper motor to forward or reverse, as well as to adjust the excitation current. Therefore, the medium frequency generator output power is stable. The heating temperature of the work pieces are precise controlled. A detailed description of the system's hardware and software composition and design methods are illustrated in this paper.
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