Design of LLC Resonance Low-frequency Induction Heating System
Theoretical analysis was conducted on the voltage gain and current gain characteristics of the LLC resonant circuit.A low-frequency induction heating power supply based on the LLC resonant circuit was constructed by Simulink.The structures such as the pre-charging filter circuit,rectification circuit,PID closed-loop control circuit,and sinusoidal pulse width modulation control circuit were sim-ulated and analyzed.A parallel-type low-frequency induction heating power supply based on LLC reso-nance was built,and tests were conducted on the insulated gate bipolar transistor driving signals,output current and voltage,operating frequency,and power factor.The test results show that the output voltage of the heating power supply reaches around 200 V,and the output current is around 310 A.When alu-minum alloy bars are heated to above 450℃,the power factor reaches 0.97.
万方数据
维普
