Research On Crystal Growth Inverter Power Supply Based On Phase Shift Control

Induction heating power supply with its simple,reliable operation,has been widely used in industry and life,among them,the intermediate frequency induction heating power supply with energy saving,high efficiency advantages,such as a proportion bigger market.Due to the crystal growth needs strict temperature field control,so the induction heating power supply need to be accurate when it is applied in crystal growth of power control.This paper designed and developed a 60kW/2.5kHz medium frequency induction heating power supply in the form of phase shift power adjustment.This paper first introduces the present situation and development trend of induction heating power supply,selecting medium frequency induction heating power supply as the main research object of this article.Then the background and principle of crystal growth.And induction heating power supply in series and parallel connection induction heating power supply topology structure and load characteristics was analyzed and compared,and introduced in detail the advantages and disadvantages of two kinds of topology,the series resonant inverter is selected as the scheme of the main topology;Based on the current control mode in the induction heating power supply series,for different power control strategy gives a comparative analysis,selected the most appropriate phase shift work for this power control strategy,and the work mode of resonant inverter from the perspective of conduction and frequency tracking has carried on the detailed analysis and research,based on TMS320F28335 as control core to realize the power and current double closed loop regulation.The peripheral circuit and main function of TMS320F28335 are introduced.In addition,the proper load matching is carried out for the series resonator inverter,and the main power device is calculated and selected.Finally,the electric parameters of the medium frequency induction heating power are simulated and analyzed by PSIM,and the design of the intermediate frequency induction heating power supply is verified according to the theory.The experiment proves the correctness of the above theory and realizes the load frequency tracking.The experiment data was tested,and the power supply was evaluated from efficiency and power factor and output power,indicating that the power supply was in good condition and basically met the expected target.