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图7是“X射线”保护电路,该保护电路又可分为两个工作部分:一是当行输出变压器T402因故使阳极高压过高而产生“x射线”时,T402的④-⑤绕组感应电压也相应升高,通过电阻R428、R429、VD319整流、C332滤波后,击穿稳压二极管VD317。又使“X射线”保护可控硅VS302触发导通.使光电耦合器N302的②脚接地,使N302的①、②脚内的发光二极管就会通过VD618和R693,从副电源+12 V获取工作电压而发光,N302的③、④脚内的光敏三极管饱和导通,c、e
Figure 7 is the “X-ray” protection circuit, the protection circuit can be divided into two working parts: First, when the line output transformer T402 so that the anode voltage is too high to produce “x-ray”, T402 ④-⑤ winding induction The voltage is also increased accordingly, through the resistors R428, R429, VD319 rectifier, C332 filter, breakdown regulator diode VD317. Turn on the “X-ray” protection thyristor VS302 to turn on, so that the ② pin of the photocoupler N302 is grounded so that the LEDs in the N302’s ① and ② feet will pass through the VD618 and R693 from the secondary power supply +12 V Working voltage and light, N302 ③, ④ feet photosensitive transistor saturation conduction, c, e