What are the diodes and what are they employed to?

Diodes are subdivided into many types. It can be stated that in addition to a variety of components used in addition to resistors and capacitors, what types of diodes are there?

1. Voltage regulator diode

Zener diodes, sometimes called Zener diodes. The principle is to use the reverse breakdown state of the pn junction. The current varies over a wide range but the voltage remains substantially unchanged. Zener diodes are graded by breakdown voltage. If you wish to obtain a higher voltage, you can use them in series to get a higher output constant voltage. For example, 1N4620 regulator 3.3V, 1N4625 regulator 5.1V, etc., power ranging from 200mW to 100W.

2. LED

It is composed of a compound containing gallium (Ga), arsenic (As), phosphorus (P) or the like. The gallium arsenide diode emits red light, and the silicon carbide diode emits yellow light. The diode is driven forward, has a low operating voltage, and has a relatively small current, especially for a patch type, which has a long life and can emit light of various colors, and is widely used for billboards and digital screen displays and other needs. The occasion of lighting.

3. rectifier diode

Rectifier diodes are conceivable for rectification, using a single-directional conduction to rectify the AC into a DC output. For the rectifier power supply in the ordinary regulated power supply, the reverse recovery time of the cutoff frequency is not really strict. Generally, the maximum rectified current and the maximum reverse operating voltage can be satisfied. Such rectifier diodes include 1NXX series and 2CZ series. For high-frequency switching power supplies, rectifier diodes with higher operating frequency and shorter reverse recovery time are utilized. These diodes are available in RU series, V series, 1SR series, and so on. Higher ones can be considered for rectification with Schottky diodes.

4. detection diode

Detection is to extract the modulation signal from the input signal to correct the current. Generally, 100mA is the demarcation point. Usually, the output current is lower than 100mA. The diode for detection is usually used in a small signal circuit such as a semiconductor radio or a television.

5. Schottky diode

Schottky diodes are low power, ultra high speed diodes. Its main feature is that the reverse recovery time is extremely short. The minimum can reach a few nS, and its forward conduction voltage drop is only about 0.4V. Widely used in high current rectifier diodes, freewheeling diodes, protection diodes. Some switching power supplies require a Schottky diode.

The above five is often used, and is classified according to the purpose of the diode. In addition to these, there are many other classifications of diodes, which do not appear here. In addition, diodes can be ranked according to their configuration and characteristics.