With the development of the lighting industry in recent decades, various lighting industries are booming. Today, I will briefly introduce the related applications of diodes:

1. Rectification

Utilizing the unidirectional conductivity of the diode, alternating current with alternating directions can be converted into a single-direction pulsed direct current.

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 remains basically unchanged (silicon tube is 0.7V, germanium tube is 0.3V). 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

It plays a role of detecting in the radio.

6. Deformation

Used in the tuner of the TV.

7. Display

Used on monitors such as VCD, DVD, calculator, etc.

8. Voltage stabilization

The Zener diode is essentially a surface junction silicon diode, and the Zener diode works in a reverse breakdown state. In the manufacturing process of the diode, it has low-voltage breakdown characteristics. The reverse breakdown voltage of the Zener diode is constant, and a current-limiting resistor is connected in series in the voltage regulator circuit to make the current after the Zener diode breakdown does not exceed the allowable value, so the breakdown state can last for a long time without damage.

9. Trigger

Trigger diode, also known as bidirectional trigger diode (DIAC), is a two-terminal semiconductor device with a three-layer structure and a symmetry. It is often used to trigger triacs and used for overvoltage protection in circuits.