(2)场扫描保护电路是对场输出电流大小的检测,通过保护驱动电路来完成。在场输出电路工作正常时,ICl50l的5脚的静态电位为0 V(即A点电位),此时设计使Q150l正偏导通,其集电极呈低电平,该电平经D1501加到图中B点,同时Q1503也正偏导通,其集电极呈低电平,由于Q1502的发射极通过R1506按的15 V电压,故Q1502正偏导通,集电极呈低电平,通过D1506 (2) field scan protection circuit is the size of the field output current detection, through the protection of the drive circuit to complete. In the presence of output circuit is working properly, ICl50l the 5 feet of the static potential of 0 V (ie, A point potential), this design is Q150l forward bias, the collector was low, the level of D1501 added to the map In the B point, while Q1503 also partial conduction, the collector was low, because the emitter of Q1502 by R1506 by the 15 V voltage, so Q1502 is partial conduction, the collector was low, through the D1506