Diode application

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Diode application

Rectification

The rectifier diode is mainly used for the rectifier circuit, that is, the alternating current is converted into the pulsating direct current. The rectifier diodes are all junction-type, so the junction capacitance is large, which makes the operating frequency low, generally below 3kHZ.

2. Switch

The diode has a small resistance under the action of the forward voltage and is in a conducting state, which is equivalent to a switch that is turned on; under the action of the reverse voltage, the resistance is large and is in an off state, like an open switch. Various switching logic circuits can be used to form various logic circuits.

3. Limiting

After the diode is forwarded, its forward voltage drop remains essentially the same (0.7V for the silicon tube and 0.3V for the manifold). Using this feature, as a limiting component in the circuit, the signal amplitude can be limited to a certain range.

4. Freewheeling

It acts as a freewheeling in the inductance of the switching power supply and in inductive loads such as relays.

5. Detection

The main function of the detector diode is to detect low frequency signals in the high frequency signal. Their structure is point contact type. Its junction capacitance is small, the operating frequency is high, and it is generally made of tantalum material.

6. Damping

Damping diodes are often used in high-frequency voltage circuits to withstand high reverse breakdown voltages and large peak currents. They are commonly used in TV circuits. Commonly used damping diodes are 2CN1, 2CN2, and BSBS44.

7. Display

Used on VCD, DVD, calculator and other displays.

8. Voltage regulation

The tube is made using the reverse breakdown characteristics of the diode, and the voltage across the circuit remains substantially constant, which acts to stabilize the voltage. Commonly used voltage regulators are 2CW55, 2CW56 and so on. [1]

9. Trigger

The trigger diode, also known as the bidirectional trigger diode (DIAC), is a three-layer structure with a symmetrical two-terminal semiconductor device. Often used to trigger two-way thyristor; for overvoltage protection in the circuit.