HIGH SPEED RESONANCE TRACKING METHOD FOR INDUCTION HEATING SYSTEM AND INDUCTION HEATING SYSTEM USING HIGH SPEED RESONANCE TRACKING METHOD

摘要

PURPOSE: A high-speed resonance point tracking method and an induction heating system using the method provide the maximum efficiency of induction heating by rapidly tracking a resonant frequency. CONSTITUTION: Power is supplied to a load terminal (40) by operating an inverter part (30) according to a predetermined frequency during a predetermined time. A sensing part (50) detects the voltage waveform and current waveform of the load terminal and transmits a detection signal to a control part (20). The control part generates a square wave pulse signal according to the comparison of the voltage waveform and current waveform transmitted from the control part and the ground. The inverter part is operated according to an arbitrary frequency during a predetermined time before the square wave pulse signal is generated by the comparison of the detection signal and the ground. The inverter part is operated by a switching signal according to the square wave pulse signal caused by the comparison of the sensed detection signal and the ground after a predetermined time passes. [Reference numerals] (12) Rectification part AC/DC; (20) Control part (MCU, FPGA); (21) Basic signal generator; (22) Resonance signal generator; (23) Conversion signal processing part; (24) Switching signal generation part; (30) Inverter part DC/AC; (40) R-L-C load terminal; (50) Voltage/current sensing part