Development of large current pulse generator based on thyristor
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摘要: 采用串并联结合的Marx发生器结构，以晶闸管作为开关元件，设计了大电流脉冲发生器。通过导通回路电流分析了脉冲发生器的自触发原理，并模拟了输出脉冲电流激励磁透镜产生磁场的变化曲线。进行实物电路的研制，采用充电电容参数为600 V/2200 μF，充电电压为550 V。在负载电阻为6 Ω，负载电感为31.5 mH的条件下，获得输出电压峰值为−2.1 kV，半高宽为7.34 ms，脉冲前沿为450 ns；输出电流峰值为−225 A，半高宽为6.3 ms，脉冲前沿为4.11 ms。Abstract: Applying series and parallel structure, a high current pulse generator was designed with thyristor. By analyzing the conducting current in circuit, the self triggering principle of the pulse generator is described. The variation of magnetic field in lens excited by output pulse current is simulated. The output characteristics of the circuit were measured. Using capacitors with parameters of 600 V/2200 μF and DC voltage of 550 V, under load resistance of 6 Ω and load inductance of 31.5 MH, a pulse with amplitude of −2.1 kV, FWHM of 7.34 ms, and pulse front of 450 ns was obtained. The pulse current is −225 A in amplitude, 6.3 ms in FWHM, 4.11 ms in pulse front.
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Key words:
- Marx generator /
- series and parallel structure /
- self-triggering /
- thyristor /
- magnetic lens
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图 4 四级串联二路并联自触发Marx发生器仿真电路
Figure 4. Simulation circuit of four-stage series and two-path parallel self triggering Marx generator
图 5 四级串联二路并联Marx发生器输出电压
Figure 5. Output voltage of four-stage series and two-path parallel self-triggering Marx generator
图 6 四级串联二路并联Marx发生器输出电流
Figure 6. Output current of four-stage series and two-path parallel self-triggering Marx generator
图 7 磁透镜产生磁场强度变化曲线
Figure 7. Curve of magnetic field strength produced by magnetic lens
图 8 四级串联、两路并联Marx脉冲发生器
Figure 8. Four stage series and two-path parallel Marx pulse generator
图 9 不同串联级数输出电流峰值与充电电压关系
Figure 9. Relationship between peak value and charging voltage under different series stages
图 10 不同串联级数输出脉冲宽度与充电电压关系
Figure 10. Relationship between output pulse width with charging voltage under different series stages
图 11 不同并联级数输出电流峰值与充电电压关系
Figure 11. Relationship between output current peak value and charging voltage under different parallel stages
图 12 不同并联级数输出脉冲宽度与充电电压关系
Figure 12. Relationship between the output pulse width and charging voltage under different parallel stages
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