Research And Design Of High Power Phase-shifted Full-bridge Soft-switching Power Supply

Gyrotron is a new kind of millimeter wave device,which has the characteristics of high power and wide frequency band.It has a wide range of applications in millimeter wave radar,communications and electronic warfare,controlled nuclear fusion,microwave directed energy weapon and so on.With the improvement of switching power supply topology,soft switching technology,automatic control and other theories and technologies,as well as the development of solid state high power switching devices,magnetic materials,control technology,high power switching power supply can be realized and widely used.In the development of high-power high-voltage power supply,the switching power supply technology and the application of soft-switching technology,making the high-power high-voltage power supply volume and weight decrease,power density continues to increase;the degree of digitization is also getting higher and higher.This paper introduces the application background of phase-shifted full-bridge ZVS-PWM inverter in the work of high-power microwave gyrotron,the high-power and high-voltage switching power supply based on phase-shifting control and soft switching are designed and realized.Firstly,this paper introduces the background knowledge of gyrotron and full bridge inverter,expounds the development process and technical development trend of switching power supply and related technologies.This paper introduces the theory of soft switching and phase shifting control.After analyzing the basic principle and comparing its advantages and disadvantages,the significance of phase-shifted full-bridge ZVS-PWM inverter in high power phase-shifted full-bridge soft-switching power supply is expounded.And the application of the power system in the work of high power revolving device is introduced.The significance of this research is indicated.Secondly,the working principle of PWM ZVS inverter based on auxiliary network is introduced.The working principle and equivalent circuit structure and the corresponding circuit equation of the phase shift full-bridge PWM ZVS inverter in a switching cycle are analyzed comprehensively.Through the analysis and calculation of the parameters about the resonant circuit,the dead time of the switch tube on two different lags and the condition of zero-voltage-switching are obtained.Finally,basing on the theoretical analysis of the phase shifted full bridge PWM ZVS inverter,a design scheme of a high power phase shifted full bridge soft switching power supply is proposed.The full range of ZVS can be achieved by increasing the auxiliary network to help the leading lag switch tube and the lagging lag switch tube.Through the design of the peripheral circuit of the phase shift control chip and the design of the corresponding PID closed loop control circuit,the protection circuit is designed,and the reliability of the inverter circuit is improved.This paper gives the basis for the selection of the models and parameters of the main circuit.According to these parameters,the circuit is simulated.Finally,the test waveform of the power supply experiment platform is given,and the feasibility of the scheme design and the accuracy of the parameter selection are verified.