Figure 5 Schematic of a prototypical IAT-based trigger generator.
Related Figures (16)
FIG. 1. Equivalent circuit of an IAT-based pulse generator. FIG. 2. Practical circuit of a basic pulse-generating unit. According to the Kirchhoff law, before the impedance is high before the discharge happens, the output-end of the IAT-based generator is close to open-circuit and the following equations are obtained as: FIG. 4. Analysis of IAT-based generator. (a) Open-circuit. (b) Short-circuit. In summary, t he design philosophy of the proposed pulsed-power generator is a two-stage inductive adder. For high impedance load, i.e., open-circuit, the generator is a volt- age adder; if a low-impedance load (short-circuit) exists, it will automatically change into a current adder. Via chang- ing the partial com ponents’ parameters, e.g., Rj, Ro, turns ratio and dotted terminals, the output characteristics of this generator will be ad compatibly provide jjustable. Therefore, this generator could the pulsed-voltage effect and pulsed- current effect. Section III, an example application for general triggered switches will be described. FIG. 3. Proposed pulsed-power generator using inductive adder. TABLE I. Main operating parameters of the trigger generator. The main parameters of this device are listed in Table I. If this trigger uses AC-powered, an isolation transformer-fed ®The output current is affected by the load impedance in use. FIG. 9. Photograph of the bottom layer. FIG. 7. Photograph of the top layer. TABLE II. Key parameters of test switches. FIG. 10. Application for two kinds of trigatron switches. (a) Gas-insulated spark switch. (b) Vacuum-insulated switch. Test circuit is shown in Fig. 11. The closure or break- down of the trigatron switches involves two gaps: The trigger gap and the main gap. Fig. 12 represents the typical output waveforms of the trigger. It is seen clearly that the trigger can generate a rapidly rising voltage pulse applied to the trig- ger pin in the earthen electrode at first. Once the trigger gap breaks down, the trigger voltage will fall and a hundreds of current pulse will follow. The closure of the main gap lies on the physical process caused by trigger pulse. In this appli- cation illustrated by this paper, the trigger gap is for surface flashover. FIG. 12. Typical output waveforms of the trigger. FIG. 14. Typical voltage waveforms related to vacuum-insulated switch. To sum up, the proposed trigger supports two relevant pulsed-outputs through the voltage and current adders. This superiority makes the pulse-accepter meet the requirements of both the break-voltage and sustained-current effect. This means compatibility or versatility. FIG. 13. Typical voltage waveforms related to gas-insulated spark switch.
