The problem here is that one control port supplies power to the bases of three PNP transistors. When one transistor fails, it cannot enter the saturation zone. Due to the different initial values of VBE and HFE for each transistor, which vary greatly with temperature changes, the three transistors cannot be biased correctly. The transistor with lower VBE has the highest bias resistance current, while the bias current of the other two transistors appears smaller.
The basic working principles of PNP semiconductor transistor and NPN semiconductor transistor are exactly the same. Taking NPN semiconductor transistor as an example, we will explain its internal current transmission process and then introduce its working principle.
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