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图5(a()见10期)和图5(b)采用NPN二极管作为检测管,图5(c)和图5(d)采用晶闸管作为检测管。由于所检测的电压较低,大多通过稳压二极管和限流电阻对被检测的电路进行检测,图中的VDl为取样基准二极管,R1为限流电阻,Vl或VT1为检测管(三极管V1或晶闸管VT1)。被检测电压正常时,低于基
Figure 5 (a () see 10) and Figure 5 (b) using NPN diode as the detection tube, Figure 5 (c) and Figure 5 (d) using thyristor as the detection tube. Since the detected voltage is low, most of the detection circuit is detected by a Zener diode and a current limiting resistor. In the figure, VD1 is a sampling reference diode, R1 is a current-limiting resistor, Vl or VT1 is a detection transistor (transistor V1 or Thyristor VT1). When the detected voltage is normal, lower than the base