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一、必要性ＸＧ－５００型Ｘ线机的管电压控制是用一对反向并联的主可控硅搭成一个交流双向无触点开关来控制高压初级的通、断。具有控制敏捷，可在０～２００次／ｓ的频率范围内与其它控制电路协调地工作。电路压降很小，可完全避免电孤放电，并具有在电源电压零相位附近接通
I. Necessity The tube voltage control of the XG-500 X-ray machine uses a pair of anti-parallel main thyristors to form an AC two-way non-contact switch to control the high voltage primary on and off. With agile control, it can work in coordination with other control circuits in the frequency range of 0 to 200 times/s. The circuit voltage drop is very small, it can completely avoid electrical discharge, and it has to turn on near zero phase of power voltage.