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晶体三极管是电子电路的基础元件之一。设计人员根据电路要求,将电路中的晶体管分别设计工作于放大状态、饱和状态或截止状态。一旦这些晶体管因某种原因非正常地改变了工作状态,就会引起电路工作失常,导致电子产品发生故障。因此,通过检查电路中相关晶体管的工作状态,对故障进行分析,进而查找故障发生的部位,是维修人员的常用方法,也是电子技术初学者必须掌握的基本功之一。晶体管放大状态的判断晶体管工作于放大状态时,其最基本的特点是发射结(b、e极)为正向偏置,而集电结(b、c极)为反向偏置。以小功率NPN型硅管为例,表现为V_(bc)=0.6～0.7V,而V_(bc)<0V(具体数
Transistor is one of the basic components of electronic circuits. Designers according to the circuit requirements, the circuit transistors were designed to work in the enlarged state, saturated or off state. Once these transistors for some reason abnormal changes in the working state, it will cause circuit malfunction, resulting in electronic products failure. Therefore, by examining the working state of the related transistors in the circuit, analyzing the fault and then locating the fault occurs, it is a common method for maintenance personnel and one of the basic skills that the beginner of electronic technology must master. Transistor amplifier to determine the state of the transistor is working in the enlarged state, its most basic characteristic is the emitter junction (b, e pole) is forward biased, and collector junction (b, c pole) is reverse bias. Taking low power NPN type silicon tube as an example, it shows that V bc = 0.6-0.7 V and V bc <0 V (the specific number