Research Of Rectangular Pulse Marx Generator And Triggered-gap Switch

Pulsed power technology has been widely used in the domain of national defense and civil industry. Compact pulse power system is of promising future. Rectangular pulse Marx generator has the trait of exporting rectangular pulse with its energy stored only once. It is small in size, simple in structure but it can export longer high voltage pulse compared with pulse forming line (PFL). According to the analysis of the there key technologies of rectangular pulse Marx generator: Marx generator theory, pre-trigger theory and triggered gap-switch theory in detail we finally made a 400 kV rectangular pulse Marx generator. The results of this paper lay a foundation for the design and construction of rectangular pulse Marx generator.To begin with, we analyzed the rectangular pulse Marx generator theory, triggered gap-switch theory and different charging ways of Marx generator. By the deducing of the analytical solution of constant current charging of Marx generator we illustrate the advantage of constant current charging in detail and the relationship of the charging speed and efficiency with the charging parameters. The analytical solution is coincident with the result of the circuit simulation by Spice. Then triggered gap-switch theory is analyzed, and a Spice model for this switch is build. Moreover we analyzed the pre-trigger theory. By using the Marx generator circuit to trigger the LC circuit we can avoid the difficulty to control the trigger timing series, reduce the jitter of Marx generator, guarantee the superposition of the two output voltage.Based on the above analysis we designed a 400 kV rectangular pulse Marx generator and build its SolidWorks model. With its SolidWorks model we calculated the parasitic parameters of this Marx generator. According to the calculation of the parasitic parameters we made a circuit simulation of this Marx generator by Spice. The results of the simulation show that it can export rectangular pulse as we designed and it has some special advantages such as a wider range of matching impedance and longer pulse.Furthermore, we analyzed the electric field distribution and tested the self-breakdown voltage, delay, jitter of the 200 kV triggered gap-switch. The results of the self-breakdown voltage test remarkably consist with the former calculation. Before the triggered test we have designed a pulse trigger with a 68 ns rise time and a 100 kV output voltage. The triggered test result manifest that the time delay and jitter of the switch will drop with the increasing of the pressure in the switch with the same percent of breakdown voltage。The test shows that the switch can fulfill the task.Finally we build up a rectangular pulse Marx generator as we designed and tasted its output. When the charging voltage is±20 kV in air we can get 70 kV, 0.8 us output with 40 ns rise time. We got the result we have designed.