Design and performance analysis of two-stage MPC system

A thorough theoretical analysis of a two-stage magnetic pulse compression (MPC) system is presented. The MPC system suffices to form 20kV, 70ns pulses across a 207¿ resistive load. Equivalent circuits for two consecutive operation stages of the compressor accounting for nonlinear processes in magnetic switches are analyzed. Both experiment and simulation results illustrated pre-pulse and reverse oscillation waveform on the resistive load. A thorough theoretical analysis of the cause of the pre-pulse and reverse oscillation waveform is presented. Equivalent circuits for final operation stage of the compressor accounting for pre-pulse and reverse oscillation waveform in magnetic switch (MS) are presented and analyzed. Simulation results illustrated how unsaturated inductance of MS and resistive load affected the amplitude of pre-pulse. To diminish the pre-pulse, unsaturated inductance of MS must be aggrandized which means a better ferrite core with higher differential permeability should be considered. Reverse oscillation waveform can be damped by increasing the inductance of freewheeling inductor which connected in parallel with the load. If a fast-recovering diode is applied as a substitute for the freewheeling inductor, current would mostly flow through the diode while charging, and almost no pre-pulse appears on the load, also the final operation stage matching improves, so that the pulse voltage reverse amplitude and damped oscillation duration are reduced drastically. The experimental results obtained with a resistive load are in fair agreement with the circuit calculation.