Design And Experimental Study Of A High-voltage Converter Under Small-scale Constraints

In-line security system is developing towards miniaturization and integration.In order to meet the requirements of high pulse energy initiation of exploding foil under small volume constraints,this paper studies the topology design method of transformerless high-voltage converter.The influence of parameters in the high voltage pulse discharge circuit is discussed,the electromagnetic radiation in the circuit and the space electromagnetic radiation in the high voltage environment are analyzed,and the corresponding electromagnetic radiation protection measures are taken.Firstly,aiming at the small volume constraints,the topology of boost converter is proposed,its working principle and critical conditions are analyzed,and the calculation method under critical conditions is obtained.According to the control requirements of high-voltage converter,the open-loop transfer function is derived and the small signal model is established,and a highvoltage feedback circuit design is proposed for the high-voltage feedback state.In order to reduce the stress and improve the output gain of the converter,the topological structure of the boost converter is proposed.Secondly,the theoretical model of the pulse discharge circuit is established,and the functional relationship between the parameters of ideal components and the main indexes in the pulse discharge test is derived.The common discharge test parameters are calculated and the simulation is designed.The simulation results verify the correctness of the function relationship,and show that reducing the equivalent capacitance and resistance in the discharge circuit can effectively improve the peak value of pulse current.Aiming at the main electromagnetic interference sources in the small volume working environment of the high voltage converter,the interference path is analyzed and the circuit is optimized to reduce the common mode and differential mode interference.This paper analyzes the causes of two kinds of electromagnetic radiation when the high-voltage converter is working,establishes the model and carries on the simulation,obtains the distribution and the size of the electromagnetic interference field,and designs the electromagnetic shielding measures.The results show that electromagnetic shielding measures can effectively reduce electromagnetic interference and ensure the safe operation of low-voltage devices.Finally,the designed topology of the high-voltage converter is simulated with Simulink software,and the simulation results show that the method achieves the expected results.According to the principle and topology,the circuit board is made,the system is tested and the discharge test is carried out with the exploding foil.The test results show that the high-voltage converter can detonate the exploding foil smoothly under the small volume constraints.