Original title: Principle of triode
Introduction: Triode is called semiconductor triode, also called bipolar transistor and crystal triode. It is a semiconductor device for controlling current. Its function is to amplify weak signals into large electrical signals and use contactless switches. Transistor is one of the basic components of semiconductor, which has the function of current amplification and is the core component of electronic circuit. Triode is to make two PN junctions close to each other on the substrate of a semiconductor. The two PN junctions divide the whole semiconductor into three parts, the middle part is the substrate, and the two sides are the emitter and collector regions. The arrangement modes are PNP and NPN.
The working principle of triode is explained as follows
The following figure (a) is a schematic diagram of pnp transistor in the bias region. E, the blank area of the joint surface is narrowed in forward bias, the potential barrier seen by the carrier becomes smaller, and the electric hole of the emitter is injected into the base. Electrons from the base are also injected into the BC junction of the emitter, and the consumption area becomes wider, and the position seen by the carrier becomes larger, so it does not pass by itself. The following figure (b) depicts the distribution of hole and electron potential energy in the forward active region without bias and bias.
What is the difference between a triode and two pn diodes connected in everse? The biggest difference is that the two junctions of the triode are quite close. Taking the pnp triode biased in the forward active region as an example, the electric hole of the emitter is injected into the N-type neutral region of the base, immediately surrounded by many carrier electrons, diffused towards the collector, and recombined by electrons. When the composite hole does not reach the depletion region of BC junction, the electric field in this region will accelerate to sweep into the collector. The electrical hole is the most carrier in the collector, which quickly reaches the ohmic contact connected to the outside through the drift current to form the collector current integrated circuit.
The above content mainly introduces the working principle and schematic diagram of triode. If you need triode and other related products, please leave a message or call: 0755-28100016; Massive triodes are in stock with complete specifications. Welcome to consult the price or take samples for testing.
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Label: Triode Principle, Triode Principle, Triode Working Principle, Triode Working Principle 
