SPICE analysis of an innovative solid-state Marx topology utilizing a boost regulator circuit to generate millisecond pulses with low droop

SPICE simulations indicate that a solid-state Marx modulator utilizing a novel boost circuit topology can generate a 5 ms long megawatt pulse at 10 Hz with a voltage droop of less than 1%. The boost regulator operates by charging the discharge capacitor voltage with energy stored in a boost inductor. Both the discharge and boost capacitors are charged to the same pre-pulse voltage, so a simple power supply structure is required. A feedback circuit controls the operation of the boost IGBTs, increasing the efficiency of the circuit by limiting the current through the boost inductor. Additional controls prevent overcharging of the discharge capacitor in the case of fluctuating load impedance. Techniques are introduced to mitigate the output voltage ripple generated by the switching transients.