Research And Control Of Plasma Thruster Power Source

With the continuous improvement of technological level and the further advancement of aerospace technology,people’s research on aerodynamic propulsor is gradually deepened.How to overcome the problems of high fuel consumption and high noise of traditional thrusters has become an important aspect of thruster research.In recent years,due to the continuous innovation of plasma technology,plasma thrusters have gradually entered people’s field of vision,and developed into a research hotspot.Firstly,this thesis discusses the working mechanism of the plasma thruster,analyzes the microscopic process of ion movement in the case of positive and negative corona discharge,explains the physical process of thrust formation,designs the corresponding circuit topology,describes the working principles and modes of the voltage regulator circuit,LLC resonant circuit,and voltage doubler rectifier circuit selected by the system,introduces PWM control and PFM control into the circuit system to ensure the stable output of the high voltage of the whole circuit after the stage.Then it models and analyzes the large-signal of the system voltage regulator Buck circuit,designs the Buck circuit parameters and double closed-loop control to ensure the stable output of the voltage regulator circuit.It also uses the fundamental wave equivalent method to analyze the full-bridge LLC resonant circuit and calculate its parameters to ensure that the LLC resonant circuit achieves frequency adjustment control.Secondly,this design selects STM32F103RCT6 single chip microcomputer as the system main control chip,the overall system is divided into two parts:remote control and main control.According to the circuit diagram topology and actual operation requirements,this design performs hardware design on the power management circuit,drive circuit,sampling circuit,auxiliary circuit and other modules for the different voltage levels and different functions of the overall system,and elaborates the system work process.In addition,this design uses LabVIEW to write the host computer software to realize the real-time monitoring of the system operation.Finally,the paper carries out simulation and experimental verification of the overall system,verifies the correctness of the topology design of this circuit,and draws the schematic diagram and PCB diagram of the corresponding topology.Then this design builds an experimental platform and experimental prototype,uses a variety of control methods such as remote control,upper computer control,lower computer active control to achieve the adjustment of the required high-voltage system,Finally,this paper uses the needle-mesh electrode structure to test the feasibility of the overall circuit,draws the relationship between voltage and thrust,and verifies the correctness of the overall design.