一、电子延时开关电路原理分析由附图可知该电路由桥式整流电路,BG1、BG2等阻容元件组成的电子延时开关电路和白炽灯泡(X)等部件构成。1.静态分析在静态时 ZF 触发开关弹起,D 点的电压不能通过 R6、ZF和 R7加到 BG2的基极,BG2因基极得不到偏压而截止,BG1因 BG2的截止而不能导通,相当于开关被断开,所以白炽灯泡(X)不能被点亮。此时 A、B 两点间的电压等于市电电压。由于 A、B 两点间的电压较高,故有微小电流通过 First, the electronic delay switch circuit schematic analysis shows that the circuit by the bridge rectifier circuit, BG1, BG2 and other RC elements consisting of electronic delay switch circuit and incandescent bulbs (X) and other components. 1. Static Analysis When the static ZF trigger switch pops up, the voltage at point D can not be applied to the base of BG2 through R6, ZF and R7. BG2 is not biased by the base and ends. BG1 can not be turned off by BG2 On, the equivalent switch is off, so the incandescent bulb (X) can not be lit. At this point A, B voltage between two points is equal to the mains voltage. As A, B between the two high voltage, so there is a slight current through