Measurement and Characteristic Research of Laser Triggered Vacuum Switch On-Inductance
Ou Jian1, Liao Minfu2, Lu Gang2, Zhang Yunliang1, Han Xiaotao3
1. School of Hydraulic Engineering Dalian University of Technology Dalian 116024 China; 2. School of Electrical Engineering Dalian University of Technology Dalian 116024 China; 3. National High Magnetic Field Center Huazhong University of Science and Technology Wuhan 430074 China
Abstract：Laser Triggered Vacuum Switch (LTVS) is a pulse power switch. As the core structure of the pulse power system, LTVS has high accuracy, reliability, and short delay, which is promising in pulse power systems. LTVS on-inductance is closely related to LTVS structures and plasma properties. LTVS on-inductance can be reduced by optimizing the switch structure, electrode structure, and trigger condition, thus improving the current rise rate and the working performance. Therefore, it has become an important research direction for reducing and measuring the inductance of LTVS, and finding the development of discharge channels. This paper proposes an improved RLC oscillation circuit to measure LTVS on-inductance. Using proper line impedance and the voltage of LTVS, this method eliminates the influence of circuit impedance on the measurement and reduces the error caused by the arc during the discharge process. The experiment platform of LTVS conduction was built. The current and voltage waveforms were obtained under different operating voltage and laser energy. LTVS on-inductance was calculated based on theoretical analysis and experimental data. Experimental results show that the operating voltage increases from 1.6 kV to 3.0 kV, and LTVS on-inductance increases from 240 nH to 400 nH in the first two cycles. LTVS on-inductance is 40~100 nH in the third cycle, less than in the first two cycles. Additionally, the laser energy has little influence on the arc during the LTVS discharge process. When LTVS is closed, there is a balance between the force from arc shrinkage and particle diffusion during the first two decay cycles. The force of particle diffusion is stronger than arc shrinkage due to insufficient energy input, resulting in a decrease in LTVS on-inductance. With the increased operating voltage, the arc shrinkage caused by self-generated magnetic becomes stronger. Hence, LTVS on-inductance increases. The laser trigger energy can affect the trigger delay time of LTVS, while the operating voltage determines the arc shape. Therefore, the laser energy is not a strong variable in LTVS on-inductance. According to the theoretical analysis, the smaller the gap distance, the smaller the LTVS on-inductance. Therefore, LTVS with a smaller gap distance has a smaller on-inductance based on fulfilling the performance restriction. Moreover, electrode distance and magnetic control can effectively reduce LTVS on-inductance. Different types of electrodes can produce different arc shapes. The development characteristics and diffusion mechanism of the LTVS discharge channel are not clear enough. The adjustment measures of the vacuum arc and the improvement methods of reducing LTVS on-inductance need to be improved. Reducing the LTVS on-inductance can meet the requirements of pulse power systems for high-power and high-performance LTVS, which provides a reference value for designing low-inductance LTVS and developing discharge channels.
欧健, 廖敏夫, 卢刚, 张运良, 韩小涛. 激光触发真空开关导通电感测量及特性研究[J]. 电工技术学报, 2023, 38(16): 4499-4506.
Ou Jian, Liao Minfu, Lu Gang, Zhang Yunliang, Han Xiaotao. Measurement and Characteristic Research of Laser Triggered Vacuum Switch On-Inductance. Transactions of China Electrotechnical Society, 2023, 38(16): 4499-4506.
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