Research On High Power Millimeter Wave Power Supply Module

Because gyro TWT(gyrotron traveling wave tube)can get high power output signal in millimeter wave and above frequency band,and also has the advantages of wide working band and high gain,it is often used to develop high power microwave signal source,which is widely used in military,industrial,satellite and many other fields.The electron gun is one of the important parts of gyrotron traveling wave tube,which needs high voltage pulse power supply for its normal operation,so the research of high voltage pulse power supply is essential.High-voltage pulse power supply can be divided into two parts: high-voltage power supply and pulse modulator.The high-voltage power supply part is often designed with switching power supply technology,and the phase-shifted full-bridge topology is the best choice in the field of high-voltage and high-power power supplies.At the same time,in order to improve the efficiency of the power supply and reduce the pressure of the high-voltage power supply transformer and switch tube,soft switching technology and power supply modular design methods have been successively applied to power supply design.The pulse modulator part is often designed with solid-state switch series modulation technology.The specific design process of this article is as follows:First of all,this article introduces the development history and trends of high-voltage power supply and pulse power technology,and determines the design methods of each part of the high-voltage pulse power supply,namely,phase-shifted full-bridge topology and solid-state switch series modulation technology.In terms of high-voltage power supply,in order to realize the soft-switching technology,this article adds auxiliary networks to the leading and lagging arms of the phase-shifted full-bridge topology,and introduces its working principle and small-signal model.According to the power supply index,a modular design scheme is adopted,and the components of the power supply module are designed and selected through design theory.Select the corresponding device according to the device parameter calculation formula and the safety margin,and design the transformer through the AP method.Design the remaining auxiliary circuits of the power module,mainly including switch control,drive circuit,feedback control circuit,fault detection circuit,protection and reset circuit.The pulse modulator adopts a multi-layer design,each layer is made up of multiple IGBTs in series,and the consistency of the switch is ensured through the driving method of magnetic coupling,so as to ensure the balance of the voltage between the IGBTs;the high-frequency modulation mode is used to replace the pulse modulation Mode to prevent saturation of the transformer core;add over-current protection circuit and reset circuit design to prevent damage to the modulator.Then,through the PSpice simulation software to verify the principle of the circuit designed in this article,to ensure that various functions can operate normally.Finally,the pulse power supply designed in this article is tested experimentally.The test content mainly includes the verification of the phase-shifted full-bridge theory,the verification of the soft switch,the verification of the modulator drive signal,the protection function,and finally the overall pulse waveform of the high-voltage pulse power supply.Verification and verification of the ignition protection function ensure that the high-voltage pulse power supply designed in this article can meet the needs of the gyro TWT.