Study on Starting Characteristic of Synchronized Dual Frequency Gear Quenching Power Supply

Synchronized dual-frequency induction hardening machine tool is widely used in gear surface heat treatment because of its characters such as saving energy, no pollution in environment, high processing efficiency, small deformation of workpiece and so on. In view of the poor load adaptability of the dual frequency induction heating power supply; the high frequency and intermediate frequency connected to the same transformer, the crosstalk current will bring interference to the stable start of the power supply and so on, the high frequency and intermediate frequency in the synchronous dual frequency topology are modeled and simulated respectively. Based on the resonance points of medium and high frequency circuits, the phase difference angle of the inverting side current is studied at different frequencies, and the effect of crosstalk current is analyzed and verified by experiments. The results show that setting the start-up parameters near the resonance point and setting the phase difference angle threshold can ensure the efficient and stable start-up of dual-frequency power supply. Keywords-Synchronous Dual Frequency; Model Reconstruction; Phase Difference Angle; Crosstalk Current