Development of a long-lifetime spark gap switch and its trigger generator for 2.0 MJ capacitive pulsed power supply module
Development of a long-lifetime spark gap switch and its trigger generator for 2.0 MJ capacitive pulsed power supply module
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DOI：
10.1109/tps.2013.2248390
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
Lee Li;Bao Chaobin;Feng Xibo;Q. Xiangdong;L. Fuchang
中科院分区：
文献类型：
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作者：
Lee Li;Bao Chaobin;Feng Xibo;Q. Xiangdong;L. Fuchang
从先进激光系统的最新要求出发，研制了2.0MJ脉冲电源模块的开关触发系统。本文讨论了这种开关触发系统的设计、结构和试验。火花间隙开关采用双电极结构，具有工作寿命长、高峰电流大、上升时间快等优点。构建了基于脉冲变压器谐振充电的触发发生器Transformer。磁隔离器和压力控制器是该系统的辅助设备。在数学原理部分，给出了石墨电极火花间隙开关寿命和稳定性的计算公式。这些表达式可作为同类型开关的设计依据。对于触发发生器，分析指出，采用基于磁芯式脉冲Transformer的谐振充电方式，可以获得合适的比例。充电时间取决于初级和次级电容器的漏电感和电容。广泛的测试证明了开关和触发发生器的工作参数。实测2.0MJ电容式脉冲电源模块的放电电流波形，峰值电流大于500kA，脉宽大于500 μs。寿命试验表明，该开关触发系统能够承受200 kC以上的转移电荷。通过更换电极，可以进一步延长开关的使用寿命。
Starting from the updated requirements of an advanced laser system, a switch-trigger system for a 2.0 MJ pulsed power supply module has been developed. This paper discusses the design, construction and testing of this switch-trigger system. The two-electrode construction for the spark gap switch was selected due to the superiority in long working life, high peak currents and fast rise-time of currents. The trigger generator based on resonant charging of pulse transformer was constructed. A magnetic isolator and a pressure controller were the auxiliary equipments of this system. In the section about the mathematical principles, the equations of the lifetime and stability of this spark gap switch with graphite electrodes are given. These expressions can be regarded as the design basis of the same type switch. As for the trigger generator, the analysis states that an appropriate ratio can be obtained when using the resonant charging based on core-type pulse transformer. The charging time is dependent on the leakage inductance and the capacitance of the primary and secondary capacitors. Extensive testing has proved the operating parameters of the switches and trigger generator. The measured discharge current waveform of 2.0 MJ capacitive pulsed power supply module is demonstrated to be over 500 kA peak-current and 500 μs pulse-width. And the life test has proved that the switch-trigger system can support more than 200 kC transfer charge. Via replacing the electrodes, the lifetime of this switch can be extended more.