| Pulsed power technology has been used extensively in the fields of scientific experiments, national defense, biomedicine and environmental protection etc. As one of the crucial components, a high-energy switch with high pulse repetition rate, high voltage, high current, long life-time, fast turn-on time and low jitter is greatly expected to meet the rapid development of pulsed power system.This thesis initiates with the review of different types of high power pulse closing switches including the operating principles, electrical parameters, advantages, disadvantages and the recent development trend of high power pulse closing switches. Especially the working mechanisms and the classification of the gas spark switch are introduced here.The two-electrodes switch has no trigger electrode ,which can improve the life of switch, and in the structure, size, weight, cost and other aspects, the advantages of the two-electrodes switch are fairly obvious. This paper discusses the design of the two electrodes switch in the aspects of the electrode material, electrode shape, insulation shell, and the insulation gas.The two-electrodes switch must to be triggered by output voltage of 75kV. To protect other key components of the system, magnetic switch is required in the main circuit. In this paper, we discuss the basic magnetic characteristics, the principle of magnetic switch. and then complete the design of the magnetic switch according to the actual requirements.The elementary experiments indicate that the self-breakdown voltage of the switch is little dispersive because of machining, the average self-breakdown voltage can be adjusted the filling pressure of switch.According to actual case, the self-breakdown voltage of the switch is setted at about D.C. 50kV. The high current circuit has been designed. Experiments has been done with and without the magnetic switch. The results show that the magnetic switch has obvious effect in improving the reliability of the circuit parameters and triggering.The switch has been demonstrated to discharge a 20kV with peak currents of 300kA, and charge transfers of 50C/shot.Highly reliability and long lifetime, the trigger pulse sharpener etc.are going to be developed in the future. |
