Design And Research Of High-power Magnetron Drive Power Supply

This paper designs a drive power solution for high power magnetrons,magnetron is an electric vacuum device for microwave source,the electrons in the magnetron interact with the high-frequency electromagnetic field under the control of a constant magnetic field and a constant electric field that are perpendicular to each other,and convert the electric energy obtained from the constant electric field into microwave energy.The interaction of the electric and magnetic fields complicates the load characteristics of the magnetron,at the same time,problems such as harmonic interference at high frequencies make the previous technology unable to meet new design requirements.In this paper,the technology of switching power supply is used in the design of high power magnetron driving power supply.The design scheme makes the driving problem of high power magnetron effectively solved.According to the rated parameters and load characteristics of the high-power magnetron,the overall performance index of the design was formulated,and the driving circuit schemes of the cathode and anode of the magnetron were designed respectively.From the perspective of reducing harmonic interference and reducing switching losses,the scheme selected the T-type three-level inverter as the core link of the design,established a mathematical model of the T-type three-level inverter,and selected the voltage space vector algorithm as the drive signal of the inverter,the mathematical implementation of the voltage space vector algorithm was implemented,and a model was built in the simulation software for testing.Using T-type three-level inverter with voltage space vector modulation to make up for the shortcomings in traditional design solutions,not only can the influence of harmonics on the drive circuit be eliminated,but the utilization of voltage can be improved.The hardware circuit of high-power magnetron anode drive circuit is analyzed.In the inverter module,not only the calculation and selection of the IGBT parameters are completed,but also the IGBT driver is designed.The addition of a front-stage drive interlock circuit and a rear-stage power drive circuit can improve the performance of the driver.According to the output parameters of the inverter module and the input parameters required by the anode of the magnetron as the main conditions for designing the high-frequency transformer,the main parameters of the high-frequency transformer are calculated.The output end of the high-frequency transformer is externally connected with a three-phase double voltage rectifier circuit to complete the calculation,selection and selection of the parameters of the rectifier circuit device,and the actual parameters are simulated in the simulation software.Using a three-phase double voltage rectifier circuit instead of the traditional design scheme not only greatly reduces the number of components,but also reduces the number of winding turns of the high-frequency transformer.Completed the software process design of the main system of the magnetron drive power supply.For the important subsystems in the main system software flow: SVPWM waveform generation,overcurrent detection and high-frequency transformer fault detection,the corresponding software flow chart is given to explain.