| Pulsed power technology as the key technology of high-power closing switch, its development and application are more and more widely. Rotary Arc Gap-Switch (RAG) has the new type of high-power closing switch performance, because of its current large coulomb transfer and switching capacity and long life advantages. In the high current working environment, as the two electrodes without a special trigger electrode structure, making the switch's stability of the turn-on trigger must be studied as a problem.In accordance with the RAG's voltage requirements, the paper designs a three-tier charging bilateral Marx generator device as a trigger switch. Its theoretical output voltage reaches above 120kV. And the loop inductance controls 2uH, the capacitance is only about 0.1nF, the overall device is smaller and lighter. In experiments, the trigger voltage of second-level spark-gap is small and the ignition of Marx impacts on the voltage of the ground. The paper put forward a better method at the two problems.This article also analyses the Marx generator for charge-discharge mechanism of a detailed. Through mathematical analysis to compare the different charging cases of charging efficiency and the speed of charging, we get the rectifier charging is slow and the efficiency is low, but the output voltage is high, the device is simple. And this device is suitable for a single generator of Marx. DC charging has the performance of exactly the opposite, it is more suitable for repetition Marx generator. And the paper uses the circuit simulation software of ATP to verify the correctness of the theoretical analysis. Through creating Mathematical model of a Marx of the discharge circuit, we get that the output voltage of Marx is mainly related to the main capacitor, inductor and load on the circuit, and the distributed capacitance has nothing to do with the circuit. Circuit simulation using the above four parameters analyses the effects of the discharge voltage of authentication, the main circuit capacitors and inductors can affect the output voltage, but the changes in the scope of its own is small. When the load impedance is big enough, the distributed capacitance can play a larger role in oscillation of the voltage. So, in order to get good output voltage waveform, we can accord Marx designed to adjust the load impedance.For the principle of the trigger turn-on of RAG, this paper use ANSYS to simulate the electrode region of the radial electric field strength, analyze the theory of gas breakdown of nanosecond pulse under a slightly non-uniform field. Through the trigger test and the small current trigger on-trial test, the paper studies the characteristics of the trigger of RAG. The voltage amplitude and the rising edge of the trigger pulse affecting turn-on the stability of the trigger was not obvious. When the amplitude reaches a certain value, the major role is the pulse width of the first half-wave pulse. That is, in the initial stage, the moment output energy is great enough to make a stable turn-on switch. This article through the test results rough estimating the trigger delay of the RAG, but the frequency response of the high-voltage pulse measuring instrument is low, and the time delay is also not precise enough. The article also based on the actual work compares the two trigger methods, getting that the method of triggering the anode side of the switch is much better than triggering the load side of the switch, and then using in the high current experiment.In the high-current environment, the device is also through the switch's t high current test to verify its stability. All three tests have a smooth turn-on trigger, and the trigger device is relatively satisfied with stability. |
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