All Solid-state Repetition Rate Marx Generator Key Technologies

In this paper, the history of pulsed power technology was outline. The development and demand of all solid state repetitive Marx generator was pointed out, and an overview about this research was presented. The circuit topology and key technologies was also discussed. Since the development of all solid state repetitive Marx generator is required, the high power switch using IGBT and the passive pulse forming technology (that is, PFN or PFL) are the keystones of this paper.The technology of voltage sharing and current balancing crossing the switch using IGBT in series and parallel was researched on simulator. An IGBT stack which contains eight low power devices connected in series was designed. To equalize the voltage across every device, the technology of gate signal delay controlling and passive snuuber networks RCD were used. The trigger system is composed of ten pieces of chip with a simple circuit, in which the delay time and pulse width of the trigger optical signal can be adjusted respectively. The drivers of IGBT based on a professional IGBT driver chip were designed and tested. The IGBT stack is tested at the resistive load of 10Ωwith the operation voltage of 4 kV, pulsed current of 360 A has been obtained at the repetition rate of 1 kHz.Several types of PFN design was optimized using circuit simulation software, which considering both the requirements of engineering and electrical characteristic, and three kinds of PFN was obtained. It can be selected to use either of them according to actual conditions and need. A type of PFN which is easier to install and has better pulse was tested. When PFN is charged to 4 kV, the output current is 200A with the ripple coefficient of 4.5%, width of 1100ns, rising time of 100ns, failing time of 290ns. The experimental results verify the simulation results. The PFL was also tested and a preliminary experimental data was obtained.A number of Marx generator circuit was studied on simulator, and an appropriate circuit which is based on PFN was picked up. The charging and discharging path of PFN in the Marx generator was improved by using high voltage diode which can protect the broken-down switch. A preliminary design of all systems was completed and a module of Marx generator was designed in this paper.