Research On Characteristics And Controller Of Triggered Vacuum Switch

The switch is the kernel component and the main technical obstruction of the pulsed power system (PPS). As an energy fast closing (releasing) switch, the TVS is considered as the most prospective switch in PPS. In this paper the fundamental characteristics of the TVS are theoretically and experimentally researched.The field-breakdown mechanism in TVS was analyzed. Based on introducing the behavior of heat in solids, the heat conduction model was set up for describing the heating process of the spots on the cathode, which occur in the TVS when triggered. The models can be used for explaining the initial plasma's production and expansion mechanism and calculating the breakdown delay time on the improvement of the initial plasma produced by the trigger electrodes. For the TVS whose dielectric was coated with the TiH layer, the calculation using the heat conduction model was carried out. The calculation results confirm with Lafferty and Farrall's experimental data very well.From the structure of the field-breakdown triggered vacuum switch (TVS) pole, a novel design for controlling the trigged vacuum switch is proposed. The field-breakdown triggered vacuum switch and its control system are constructed. Trigger a new source of the controller design, from the design of basic high-voltage pulses loop and basic trigger signal generating loop, steepened high voltage pulse generating loop is proposed in the novel controller of trigged source. In the TVS triggering circuit, a three-electrode-gap is used for providing steepened high voltage triggering pulse to improve the triggering precision (within 1 us). Then a main loop with LC and a system used to collect vacuum arc image are established.A lot of research is used to study their basic working characteristics, such as the trigger reliability, the delay time and its scatter decrease with the different triggered power, the characteristic of the main gap communicated and the image of the TVS arc. The experimental results show that the field-breakdown triggered vacuum switch delay time is close to the calculation model. Through visual observation on the changes of the TVS arc the analysis of the TVS arc image is a new experiment method.