Research On Triggered System Of Main Switch Of Sg-Ⅲ Energy Module

Due to the merits of two-electrode gas gap that its ability to transfer the charge with a great through-flow capacity, the gap is widely used in the high-power pulsed power supply system. This switch requires a steep rising edge of the trigger pulse, so the trigger system that can precise control of the gas switch break over is a prerequisite for a good run.Based on the requirements of output pulse voltage waveform (Amplitude>100kV, Rise time<30ns), the paper mainly researched on the trigger system with the pulse transformer. Since that the rise time of output voltage waveform of pulse transformer is order ofμs magnitude, the peaking circuit must be set follow the transformer; the capacitance should be parallel connected to the secondary winding of transformer for enough energy to break over the switch; and the block condenser is necessary to avoid the delivery of energy between discharge circuit and trigger circuit after switch break over.Rested on the theory of electromagnetic, the paper simulated the voltage waveform on secondary capacitance with the transformer parallel connected to capacitance and analyzed the effects of parameters. A high voltage pulse transformer has been designed, and the materials and sizes of various parts are determined. In order to decrease the leak inductance, windings have been produced with coaxial construction. According to the no-load test of pulse transformer, the insulated problem of high output port has been solved to assure that the amplitude of output voltage can be 100kV. In the experiments of trigger system, the rise time of trigger voltage is about 30ns, but the measurement of amplitude lower since the lack of high voltage divider. The chopped wave will appear in the windings of transformer after the gap switch break over, therefore, the paper studied the process of steep wave intrudes into the windings. The existence of distributed capacitance is the main reason that the initial voltage distribution of winding is non-uniform, the paper discussed the methods to calculate the distributed capacitance and found that the calculated results of Maxwell2D soft are accurate enough with considering various influencing factors. Finally, the paper analyzed the influence of conductor distribution, insulated materials of windings on the distributed capacitance and initial voltage distribution, the conclusion of discussion should be the guide direction to transformer improvement.