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160 kV，10 ns上升沿脉冲触发器的研制
Development of Pulsed Trigger in 160 kV and 10 ns Raise Time
DOI: 10.12677/APP.2018.89051, PDF , HTML, XML, 下载: 929  浏览: 1,780

Abstract: In order to study the key technology of early diagnosis of breast cancer in medical system, a trigger for the X-ray phase-contract imaging system is developed. The output pulse of the trigger is required: the peak voltage = 160 kV, the rise time ≤ 10 ns, and the pulse width ≤ 100 ns. The flip-flop consists of Marx generator, spark gap switch, capacitive voltage divider and output section. The Marx generator is composed of 8 stages of coaxial positive and negative electrode charge, each level is composed of 6 40 kV 3800 pF ceramic capacitors in parallel, and the design of compact loop low inductance is adopted; and the 4 spark gap switches use the cross stage trigger discharge. At the end of the output section, a ring capacitance divider is designed as a high voltage probe for triggers. The Simplorer simulation results show that when the actual load is blocked, the output voltage is 169 kV, the rise time is less than 10 ns, and the pulse width is less than 100 ns, which meets the design requirements.

1. 引言

2. 结构设计

Figure 1. Machine drawing of Marx generator

2.1. Marx发生器

2.2. 电容分压器

Figure 2. Circuit diagram of Marx generator

Figure 3. Circuit diagram of Marx generator

3. 电路模拟

${L}_{m}={L}_{sp}+{L}_{e}$

${L}_{sp}=2{l}_{sp}\mathrm{ln}\left(R/{r}_{g}\right)$

${L}_{e}=2{l}_{e}\mathrm{ln}\left(R/{r}_{e}\right)$

${R}_{m}=\frac{2}{{V}_{m}}\sqrt{\frac{P{d}^{2}}{\text{π}a}}\sqrt[4]{\frac{{L}_{m}}{{C}^{3}}}$

$C=\frac{{C}_{m}{C}_{f}}{{C}_{m}+{C}_{f}}$

${Z}_{d}=136{\left(d/r\right)}^{2}{U}_{d}^{-1/2}$

Figure 4. Circuit diagram of Marx generator

Figure 5. Circuit diagram of Marx generator

4. 总结

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