How does a diode work, what does a diode work like?

The working principle of the diode (forward conduction, reverse non-conductive).

The crystal diode is a p-n junction formed by a p-type semiconductor and an n-type semiconductor, which forms a space charge layer on both sides of its interface, and has a self-built electric field, when there is no applied voltage, it is in an electro-equilibrium state because the diffusion current caused by the carrier concentration difference on both sides of the p-n junction and the drift current caused by the self-built electric field are equal. When the forward voltage bias is generated, the mutual suppression of the external electric field and the self-built electric field increases the diffusion current of the carriers and causes the forward current (that is, the reason for the conduction). When the reverse voltage bias is generated, the external electric field and the self-built electric field are further strengthened, forming a reverse saturation current i0 that is independent of the reverse bias voltage value in a certain reverse voltage range (which is the reason for non-conductivity).

When the applied reverse voltage is high to a certain extent, the electric field strength in the charge layer of the p-n junction space reaches a critical value, resulting in the multiplication process of carriers, resulting in a large number of electron-hole pairs, and a large reverse breakdown current is generated, which is called the breakdown phenomenon of the diode.

Hello. A diode is a semiconductor electronic component that conducts electricity unidirectionally.

The diode is made of a semiconductor called a p-n junction, and the wire that leads from the p-type semiconductor is called the positive electrode, and the wire that leads out of the n-type semiconductor is called the negative electrode.

The diode has the characteristics of current only forward conduction and reverse cut-off (i.e., forward and reverse). The forward resistance of the diode is very small, generally in a few ohms to hundreds of ohms, or even smaller, and the reverse resistance is very large, generally in the tens of thousands of ohms to tens of megaohms.

The diode works on:

The main principle of the diode is to use the unidirectional conductivity of the PN junction, and add leads and packages to the PN junction to become a diode. A crystal diode is a p-n junction formed by a p-type semiconductor and an n-type semiconductor.

A space charge layer is formed on both sides of its interface, and a self-built electric field is built. In the absence of an applied voltage, the diffusion current caused by the difference in carrier concentration on both sides of the PN junction and the drift current caused by the self-generated electric field are equal.

When there is a forward voltage bias in the external area, the mutual suppression effect of the external electric field and the self-built electric field increases the diffusion current of the carriers and causes the forward current. When there is a reverse voltage bias in the outside world, the external electric field and the self-built electric field are further strengthened to form a reverse saturation current that is independent of the reverse bias voltage value within a certain reverse voltage range.

Main applications of diodes:

Semiconductor diodes are used in almost all electronic circuits. The use of semiconductor diodes in circuits can play a role in protecting circuits and extending the life of circuits.

The development of semiconductor diodes has made integrated circuits more optimized and has played a positive role in various fields. Diodes play many roles in integrated circuits, maintaining the normal operation of integrated circuits. Here's a brief look at the role of diodes in the following four types of circuits.

I don't know.,Recently, I've learned a variety of electronic knowledge on the core check.,If you plan to get started, you can also work together.,You can greatly improve yourself.。

A diode, a device with two electrodes that allows current to flow in a single direction, and is used in many ways to rectify the current flow. and varactor diodes (varicaps

diode) is used as an electronic tunable capacitor. The current directivity of most diodes is often referred to as "rectifying". The most common function of a diode is to allow only current to pass through a single direction (known as forward bias) and block it in the opposite direction.

This is called reverse bias). Therefore, the diode can be thought of as an electronic version of the check valve.

a) VD cut-off, UO=3V.

Procedure: Assuming VD cut-off, the cathode is 6V, the anode is 3V, and the diode is subjected to a reverse voltage, cut-off. Output voltage UO = 3V.

b) VD1 cut-off, VD2 on, assuming VD1, VD2 is the ideal diode, then the output voltage UO=0V

Procedure: Assuming VD1, VD2 cut-off, then VD1 cathode 6V, anode -12V, back pressure, cut-off. VD2 anode 0V, cathode -12V, forward voltage on, assuming that the diode management, no voltage drop, then the cathode is 0V, VD1 is still subjected to back pressure, maintain the cut-off state.

The final output voltage is short-circuited by VD2 and the output is 0V.

c) VD1 is turned on, VD2 is cut-off, and the output voltage UO=-3V is assumed to be managed by the diode.

Process: Assuming VD1 and VD2 cut-off, then VD1 cathode -3V, anode +12V, conduction, its anode is embedded at -3V, so VD2 anode -3V, cathode 0V, backpressure cut-off. Output voltage UO = 3V.