Application of diode

1. Rectification

Rectifier diodes are mainly used in rectifying circuits, that is, converting alternating current into pulsating direct current. Rectifier diodes are all surface junction type, so the junction capacitance is large, so that its operating frequency is lower, generally below 3kHZ.
2. Switch
Under the action of the forward voltage, the diode has a small resistance and is in the on state, which is equivalent to an on switch; under the action of the reverse voltage, the resistance is very large and is in the off state, just like an off switch. Using the switching characteristics of diodes, various logic circuits can be formed.
3. Limit
After the diode is turned on, its forward voltage drop basically remains unchanged (0.7V for silicon tube and 0.3V for germanium tube). Using this feature, as a limiting element in the circuit, the signal amplitude can be limited within a certain range.
4. Freewheeling
It plays a role of freewheeling in the inductance of switching power supplies and inductive loads such as relays.
5. Detection
The main function of the detector diode is to detect the low frequency signal in the high frequency signal. Their structure is point contact type. The junction capacitance is small and the operating frequency is high, and it is generally made of germanium material.
6. Damping
Damping diodes are mostly used in high-frequency voltage circuits, which can withstand higher reverse breakdown voltage and larger peak currents. They are generally used in TV circuits. Commonly used damping diodes are 2CN1, 2CN2, BSBS44, etc.
7. Display
Used on VCD, DVD, calculator and other monitors.
8. Voltage stabilization
This kind of tube is made by using the reverse breakdown characteristic of the diode, and the voltage at both ends of the circuit remains basically unchanged, which plays a role in stabilizing the voltage. Commonly used voltage regulator tubes are 2CW55, 2CW56, etc. [1]
9. Trigger
Trigger diode, also known as bidirectional trigger diode (DIAC), is a two-terminal semiconductor device with three-layer structure and symmetry. It is often used to trigger a triac; used in circuits for overvoltage protection and other purposes.


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