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1 必要性 :KB 5 0 0型X线机采用无触点控制元件 :可控硅控制摄影高压初级电路 ,并通过限时电路产生零序脉冲控制主可控硅在电源电压零相位时导通 ,以防止突波电压对高压部件的损坏。当任何 1只或 2只主可控硅击穿、短路或误导通时 ,高压初级就不一定在电源电压零相位时得电 ,因
1 Necessity: The KB500 type X-ray machine adopts a non-contact control element: the thyristor controls the high-voltage primary circuit of photography, and the zero-sequence pulse generated by the time-limited circuit controls the conduction of the main thyristor at zero phase of the power supply voltage. To prevent surge voltage damage to high voltage components. When any one or two main thyristors break down, short-circuit or mis-conduct, the high voltage primary is not necessarily powered at zero phase of the power supply voltage.