What are the types of power diodes and what are the types of diodes?

Power diodes were used in the early 50s of the 20th century, when they were also known as semiconductor rectifiers; Its basic structure and working principle are the same as those of diodes in information electronic circuits, which are based on semiconductor PN junctions to achieve the functions of forward conduction and reverse cut-off; Power diodes are uncontrollable devices, and their turn-on and turn-off are determined solely by the voltage and current they experience in the main circuit. The power diode is actually composed of a large area of PN junction, both ends of the lead and the package, from the appearance of the main two types of packages: bolt type and flat plate type. Physical diagram of the power diode.

Diode Classification:

1. Point-contact diode.

The point contact diode has a small contact area of the PN junction, and cannot pass through a large forward current and withstand a high reverse voltage, but it has good high-frequency performance and is suitable for use in high-frequency detection circuits and switching circuits.

2. Surface contact diode.

The surface contact diode has a large contact area of the PN junction, which can withstand a large current and a high reverse voltage, making it suitable for use in rectifier circuits.

3. Planar diode.

Planar diodes are used as switches in pulsed digital circuits with a small pn junction area, and large when used for high-power rectification.

4. Stabilizer tube.

The voltage regulator tube is a special surface contact semiconductor silicon diode, which has the function of stabilizing the voltage. The main difference between a regulator tube and an ordinary diode is that the regulator tube works in the reverse breakdown state of the PN junction. By limiting the size of the reverse current during the manufacturing process and use, the regulator tube will not be damaged due to overheating in the reverse breakdown state.

5. Photodiode.

Photodiodes are also known as photodiodes. It has a glass window on the tube shell to allow it to receive light. Its characteristic is that when light hits its PN junction, free electrons and holes can be generated in pairs, so that the concentration of a few carriers in the semiconductor increases, and the reverse current increases under the action of a certain reverse bias voltage.

Therefore, its reverse current increases linearly with increasing light intensity.

6. Light-emitting diodes.

Light-emitting diode is a semiconductor solid-state display device that converts electrical energy directly into light energy, abbreviated as LED. Similar to ordinary diodes, light-emitting diodes are made up of a PN structure. The PN junction of the light-emitting diode is encapsulated in a transparent plastic shell and is available in square, rectangular and round shapes.

The light-emitting diode has the advantages of low driving voltage, small working current, strong anti-vibration and shock ability, small size, high reliability, low power consumption and long life, and is widely used in signal indication circuits.

(1) Classification by material.

Diodes can be divided into two categories: germanium tubes and silicon tubes according to the classification of materials. The difference between the performance of the two is: the forward voltage drop of the germanium tube is smaller than that of the silicon tube, the reverse leakage current of the germanium tube is larger than that of the silicon tube, and the temperature that the PN junction of the germanium tube can withstand is lower than that of the silicon tube.

2) Classification by use.

Diodes can be divided into ordinary diodes and special diodes according to their uses. Ordinary diodes include detection diodes, rectifier diodes, switching diodes and voltage regulator diodes; Special industrial electrodes include varactor diodes, photodiodes, and light-emitting diodes.

Diodes are divided into: rectification, detection, triggering, voltage regulation, photoelectricity, light emitting,

It is divided into rectification, voltage regulation, and detection.

There are many types of diodes, which can be divided into germanium diodes (GE tubes) and silicon diodes (Si tubes) according to the semiconductor materials used. According to its different uses, it can be divided into detection diodes, rectifier diodes, voltage regulator diodes, switching diodes, isolation diodes, Schottky diodes, light-emitting diodes, silicon power switching diodes, rotary diodes, etc. According to the die structure, it can be divided into point contact diode, surface contact diode and planar diode.

The point-contact diode is pressed on the surface of a smooth semiconductor wafer with a very thin metal wire, and a pulse current is passed to make one end of the contact wire and the wafer firmly sintered together to form a "p-n junction". Because it is a point contact, only a small current (no more than a few tens of milliampes) is allowed to pass through, which is suitable for high-frequency and low-current circuits, such as radio detection. The large area of the "p-n" junction of the surface contact diode allows a large current (a few amps to tens of amps) to pass through, and is mainly used in "rectification" circuits that convert alternating current into direct current.

Planar diode is a special silicon diode, which can not only pass large currents, but also has stable and reliable performance, and is mostly used in switching, pulse and high-frequency circuits.

There are many classifications of diodes; Let's find out!

There are four major categories and 20 sub-categories of diodes.

Classification by material: There are two kinds of classification by material, the first is (germanium diode); The second is (silicon diodes).

Classification by structure: There are two kinds of classification according to structure, the first is (electrical contact diode); The second type is (surface contact diode).

Classification by package: There are four types of classification by package, the first is (glass case diode); the second is (metal case diode); the third is (plastic case diode); The fourth is (epoxy case diode).

Classification by use: There are eleven kinds of classification according to use, the first is (ordinary diode); the second is (rectifier diode); the third is (high-voltage rectifier diode); the fourth is (silicon stack); the fifth is (Zener diode); the sixth is (switching diodes); The seventh is (light-emitting diode); the eighth is (photodiode); the ninth is (magnetodiode); the tenth is (varactor diode); The eleventh is (tunnel diode).

Commonly used are:

Rectifier diodes, detection diodes, photosensitive diodes, light-emitting diodes, constant current diodes, voltage regulator diodes, etc.

There are also special uses:

1. Constant current diode.

1 The role of a constant current diode A constant current diode (CRD) is a diode used to stabilize the current, which can provide a constant current over a wide range of voltage changes. Constant current diodes are mainly used in various amplification circuits (such as audio power amplifier circuits), oscillation circuits and regulated power supply circuits, and are used as constant current sources or constant current bias components in circuits.

A diode is a semiconductor device with a p-n junction. It is composed of a p-type semiconductor and an n-type semiconductor inside the hood, which leads out the corresponding electrode leads at both ends of the pn junction, and the tube shell is sealed to make a diode.

There are many types of diodes, which can be divided into rectifier diodes, voltage regulator diodes, light-emitting diodes, photosensitive diodes, detection diodes, varactor diodes, bidirectional trigger diodes, etc.

There are many types of diodes, which can be divided into rectifier diodes, voltage regulator diodes, light-emitting diodes, photosensitive diodes, sleepy detector diodes, varactor diodes, bidirectional trigger diodes, etc.

There are many types of diodes, and the specific types are: TVS transient (variable) voltage suppression diodes, ESD electrostatic diodes, voltage regulator (Zener) pre-spring call diodes, Schottky diodes, rectifier diodes, switching diodes, fast recovery diodes, ultra-fast recovery diodes, trigger diodes, high-efficiency diodes, constant current diodes, avalanche diodes, power diodes, modulation diodes, mixing diodes, high-frequency diodes, high-voltage diodes, detector diodes, damping diodes, varactor diodes, Amplification diodes, trigger diodes, light-emitting diodes, laser diodes, photosensitive diodes, color-sensitive diodes, magneto-sensitive diodes, thermal diodes, microwave diodes, infrared emitting diodes, dual-base diodes, rotating diodes, fiber-coupled diodes, pin diodes, TVP tubes, diode chips, other diodes, etc.

Diode.

The main types of electric two-source sock electrodes are good traces () hail brothers.

a.Ordinary diodes.

b.Fast recovery diodes.

c.Schottky diodes.

Correct answer: ABC

A diode is an electronic device made of semiconductor materials (silicon, selenium, germanium, etc.). It has unidirectional conductivity, i.e., the diode is turned on when a forward voltage is applied to the diode anode and cathode. When a reverse voltage is applied to the anode and cathode, the diode is cut off.

Therefore, the conduction and cut-off of the diode are equivalent to the switching on and off.