Analysis and design improvement of MCP-PMT high-voltage breakdown fault based on high voltage module power supply
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摘要: 为克服MCP-PMT传统高压供电设备体积大、便携性差的问题，采用了基于小型化高压模块的高压供电方式。该系统在实际使用过程中发生了一起MCP-PMT高压击穿故障。详细分析了该系统的故障原因，将问题定位为MCP-PMT内部真空度下降导致的耐压性能下降，同时还发现了导致故障发生的诱因是高压模块在加电时刻存在的高压过冲现象。针对高压模块的过冲问题，本文提出了较为巧妙的设计改进方法并取得了良好的效果，进一步提高了MCP-PMT系统的工程应用可靠性。Abstract: To overcome the large size and poor portability of MCP-PMT traditional high-voltage power supply equipment, a high-voltage power supply mode based on miniaturized high-voltage module is adopted. During the practical use of the system, a high-voltage breakdown fault of MCP-PMT occurred. In this paper, the fault causes of the system are analyzed in detail, and the problem is identified as the decline of withstand voltage performance caused by the decline of internal vacuum of MCP-PMT, and it is also found that the high voltage overshoot of the high voltage module at the time of power-up is the cause of this fault. Aiming at the overshoot problem of high-voltage module, this paper puts forward a more ingenious design improvement method and achieves good results, which further improves the engineering application reliability of MCP-PMT system.
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Key words:
- MCP-PMT /
- high-voltage module /
- high-voltage breakdown
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图 5 C-M级（a）和M-M级（b）在耐压试验的不同时刻出现的高压击穿波形
Figure 5. High-voltage breakdown waveform at different times of voltage withstand test
图 6 故障PMT在耐压试验中出现的连续击穿波形
Figure 6. Continuous breakdown waveforms of faulty PMT in withstand voltage test
图 7 加电初始时刻各极高压变化情况
Figure 7. Changes of each extreme high-voltage at the initial time of power on
图 8 故障PMT在加电时刻的高压击穿波形
Figure 8. High-voltage breakdown waveforms of faulty PMT at power on time
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