Fig 4 Under different Utcp2 (0.5kV, 1kV, 1.5kV), the PRF changes with the Utcp1
When the main trigger voltage Utcp1≤0.3kV, PRF performance significantly improves with the increasing of Utcp2 (from 0.5kV to 1.5kV), while when the Utcp1 ≥0.8kV, the Utcp2 has little effect on the PRF. It can be seen that the lower Utcp2is, a higher Utcp1 is needed to improve the initial plasma concentration. Conversely, when the Utcp2increase, the initial plasma concentration is large enough, and it will just need a very small Utcp1 to pump the initial plasma to the main gap. For example, under the Utcp2=1.5kV, only 100V main trigger voltage allows the switch to operate stably at 400Hz. After testing and verification, the Utcp1 can maintain the 400Hz PRF in the larger range of 0.1~5kV.
Conclusion: In this paper, the double-pulse triggering glow discharge structure is used to realize the high PRF pseudospark, and the test is carried out under different gas pressure, pre-trigger voltage and main-trigger voltage respectively. The results shows the minimum trigger voltage required to achieve stable trigger is about 100V, according to the test results, the simulations, about under different gas pressures, the influence of two trigger voltages on the current, carried out. Finally, combined with the simulation and test results, the influence of pre-trigger and main trigger voltage on the discharge process is summarized respectively, that is, the initial plasma is generated by pre-trigger voltage, and the main trigger pulse is responsible for pumping plasma into the main gap.