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故障现象一Philips BV 25 C型臂X线机开机后(未选任何检查程序)即闻及增强器部位发出清脆的“叭叭”放电声。故障分析与检修影像增强器是一个有多极高压的真空元件。开机后增强器的电源即为其提供10～30 kV的多级不同高压,通过电缆供给各个极。该电源的输入取自机内110 Vac经降压、整流输出±15 Vdc,再经逆变倍压电路产生高电压输出。由此原理分析并结合故障现象可初步判断:(1)增强器高压插头、插座绝缘破坏放电。(2)增强器的供电电源漏电打火所致。
Symptoms After the Philips BV 25 C-arm X-ray machine is powered on (without any checking procedure), a clear “horn” discharge sound is heard and intensified. Fault Analysis and Overhaul Image Enhancer is a multi-pole high-pressure vacuum components. The booster power supply after power on provides multi-level high voltage of 10-30 kV, which is supplied to each pole via cable. The power input from the machine 110 Vac step-down, rectified output ± 15 Vdc, and then by the inverter voltage doubler circuit to produce high-voltage output. This principle analysis and combined with the fault phenomenon can be initially judged: (1) enhancer high voltage plug, socket insulation damage discharge. (2) enhancer power supply leakage caused by fire.