80 kV adjustable high-voltage rectangle-wave pulsed power supply
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摘要: 研制了80 kV可调节高压脉冲方波电源系统以对ZnO样品特性进行测试，实现电源输出脉宽、重复频率、运行时间可调。系统采用人工形成线、脉冲变压器加可调节负载电阻等技术路线，实现了高压方波脉冲的输出；采用高速数据I/O卡产生序列脉冲信号控制两个火花间隙开关的通断，对人工形成线形成的方波进行截尾，实现了输出方波宽度可调；利用Labview中的图形化控件，编写友好简洁的计算机控制界面；采用光电隔离、光纤传输和供电隔离等一系列措施，提高触发控制系统的抗干扰能力。实验结果表明，最终电源输出电压幅值超过80 kV，输出方波脉冲宽度超过25 s，脉冲前沿小于0.7 s，并且输出电压幅值可调，脉冲宽度在输出范围内可连续调节。利用该电源对ZnO压敏电阻样品进行了测试，得到了较好的ZnO压敏电阻非线性伏安特性曲线。Abstract: A high-voltage pulsed power supply for testing the character of ZnO varistor, with adjustable pulse width, repetition frequency and running time, and most 80 kV rectangle wave-output voltage, is developed. Rectangle-wave voltage pulse is produced by pulse forming line, pulse transformer and adjustable load. Two spark gap switches work under the control of the program which generates sequence pulses by a high speed I/O data card. All control and sample signals are transmitted by optical fiber in order to reduce the influence of electromagnetic interference on the whole control system. A user-friend human-machine interface has been built on LabVIEW platform. The experimental result shows that the automatic control system runs stably, reliably, and has a strong anti-interference ability. The output voltage of the supply power is over 80 kV, pulse width over 25 s, rise time less than 0.7 s. The output voltage and pulse width can be adjusted within the anticipant range. The output current is adjustable from 0 up to 40 A in ZnO varistor testing.
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Key words:
- ZnO varistor /
- continuously adjustable /
- testing /
- control /
- rectangle-wave pulsed power supply
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