SYSTEM FOR CONTROLLING RESONANT VOLTAGE OF INDUCTION HEATING DEVICE

摘要

A system and a method for controlling a resonant voltage of an induction heating device are provided to safely protect a driving circuit by lowering the resonant voltage when the resonant voltage is over a reference value. A system for controlling a resonant voltage of an induction heating device includes an LC resonant and induction heating unit, a peak resonant voltage detecting circuit, and a digital signal processing unit. The digital signal processing unit compares a peak value of the resonant voltage detected at the peak resonant voltage detecting circuit with a preset reference voltage, and lowers the peak value of the resonant voltage by reducing the output power of the induction heating device when the peak value is higher than the reference voltage. The peak resonant voltage detecting circuit includes a resonant voltage dividing unit composed of a first resistor(R1) and a second resistor(R2) serially connected, a diode(D) of which one end is connected to a connecting node between the first resistor(R1) and the second resistor(R2), a capacitor(C) connected at the other end of the diode(D), and a resistor(R3) connected to the other end of the diode(D) and parallel connected with the capacitor(C).