Research On The High Floating Voltage Test Technology

The technology of Pulse Power Supply(PPS)is one of the key technologies of electromagnetic launch system.The PPS system has the characteristics of a large volume,a complex structure and far distance among modules.The long connecting wires are used to measure electric potential.However,this traditional test method has a couple of limits.For example,the test accuracy could be affected by the strong magnetic field and the distortion could be caused by the stray parameter on wire.Besides,the electromagnetic interference among modules and the distribution parameter between test point and the ground could increase the difficulties of the test.To monitor and control the working status of the power modules and to study the influence of spatial distribution parameters on power output,the research on the high voltage floating test technology need to be carried on.The major researches are as follows:First of all,the working principle of single module and multi-modules is introduced.Furthermore,the state equations of PFN are established in different discharge stages.The time-frequency characteristics of the target signal are gotten by circuit simulations and spectrum analysis.Several existing methods of floating test are taken to analyze the feasibility.Secondly,the divider device and the hardware compensation circuit are designed to reduce the response time of the voltage divider and to improve the deficiencies of the differential probe under high voltage.Besides,the capacitor energy storage PPS experimental platform is established to test the high floating voltage.The results show that waveform distortion of dynamic voltage signal is decreased by using the hardware compensation circuit.Also,an acceptable error in the voltage test is caused by distribution parameters.Finally,the causes of the error are analysed,and the secondary filtering method is adopted to compensate the dynamic voltage error.Then the transfer function of the test device is computed and a system simulation model in MATLAB is established.The results of the voltage test are corrected,and then compared with the calculated waveform.The conclusion is that the waveform is closer to the theoretical value after secondary filter correction.