What is the difference between a switching diode and a rectifier diode?

First, the nature is different.

1. Switching diodes.

Properties: A type of semiconductor diode, which is made to be carried out on the circuit"On"、"off"A type of diode that is specially designed and manufactured.

2. Rectifier diode.

Properties: One will alternate current.

A semiconductor device that can be converted into direct current energy.

Second, the characteristics are different.

1. Characteristics of switching diode: the time from cut-off (high-resistance state) to on-conducting (low-resistance state) of the switching diode is called the opening time; The time from turn-on to cut-off is called the reverse recovery time; The sum of the two is called the switching time. In general, the reverse recovery time is greater than the turn-on time, so only the reverse recovery time is given in the switching diode usage parameters.

The switching speed of a switching diode is quite fast. For example, a silicon switching diode has a reverse recovery time of only a few nanoseconds.

Even germanium switching diodes are only a few hundred nanoseconds.

2. Rectifier diode characteristics: using PN junction.

The unidirectional conductivity of the alternating current turns the alternating current into a pulsating direct current. The rectifier diode has a large leakage current, and most of the rectifier diodes are sealed with surface contact materials. The shape of the rectifier diode is shown in Figure 1.

In addition, the parameters of the rectifier diode include the maximum rectifier current, which refers to the maximum current that the rectifier diode can pass through for a long time. It is the main parameter of the rectifier diode and the main basis for the selection of the rectifier diode.

The high-frequency performance of the switching diode is good, and it is mainly used for the switching circuit as an electronic switch, while the rectifier tube is generally not very high-frequency performance (the high-frequency performance of the rectifier tube in the switching power supply is also very good), and it is mainly used for the rectification of the power frequency current. It usually operates at high voltages and high currents.

Switching diodes:

1. The switching speed of the switching diode is high, that is, the application frequency is high.

2. The switching diode has good high-frequency performance and is mainly used as an electronic switch in the switching circuit.

Rectifier Diode:

1. Rectifier diodes are used in the field of power frequency and high current.

2. The general high-frequency performance of the rectifier tube is not very good (the high-frequency performance of the rectifier tube in the switching power supply is also very good), which is mainly used for rectifying the power frequency current. It usually operates at high voltages and high currents.

A switching diode is a type of semiconductor diode that is designed to be carried out on an electrical circuit"On"、"off"A type of diode that is specially designed and manufactured. It takes less time than the general diode to change from on-to cut-off or from cut-off to on, and the common ones are 2AK, 2DK and other series, which are mainly used in electronic computers, pulse and switching circuits.

A rectifier diode is a semiconductor device used to convert alternating current into direct current.

The role of switching diodes for people who are not familiar with electrical knowledge, and do not know what the diode is, the switching diode plays a great role in the circuit, the following I have collected some relevant information about the role of the switching diode, I hope it can help you!

1. It is used as a switching circuit. In the on-state state, the resistance of the diode under the action of forward voltage is very small, which is equivalent to a switch-on; In the cut-off state, the resistance is large, like an open switch. With this characteristic, various logic circuits can be composed.

2. As a temperature detection device. Because of the pn junction of the diode.

It has negative temperature characteristics, and its positive pressure drop decreases by about 3mV for every degree C increase in temperature. As long as a resistor and diode are connected in series, the resistor acts as a current limiter, and the temperature of the appliance can be detected.

Uses of switching diodes:

In addition to meeting the requirements of ordinary diodes and performance indicators, switching diodes also have good high-frequency switching characteristics (short reverse recovery time), and are widely used in home appliances, computers, televisions, communication equipment, household audio, DVD players, instrumentation, control circuits and various high-frequency circuits.

Classification of switching diodes:

Switching diodes are divided into ordinary switching diodes, high-speed switching diodes, ultra-high-speed switching diodes, low-power switching diodes, high-backvoltage switching diodes, silicon voltage switching diodes, and so on.

1. Switching diode concept

A switching diode is a type of semiconductor diode that is designed to be carried out on an electrical circuit"On"、"off"A type of diode that is specially designed and manufactured.

2. The role of switching diodes

In fact, to put it simply, it plays "on" and "off" in the circuit'Function. So how is this role achieved? Since the on-resistance of the semiconductor diode is very small under the forward bias voltage, and when the reverse bias cut-off is applied, the one-way conductivity of the semiconductor diode can be used to turn the current on and off in the switching circuit.

3. The parameters required when selecting the specific model

When selecting a switching diode, the main parameters that need to be paid attention to are: forward current, maximum response voltage, reverse recovery time, etc.

4. How to choose a switch diode

The medium-speed switching current and detection circuit can be selected with 2AK series ordinary switching diodes. High-speed switching diodes of the RLS series, ISS series, 1N series and 2CK series can be selected for high-speed switching circuits.

5. The main application of switching diodes

Switching diodes are mainly used in radios.

Household appliances and electronic equipment such as televisions and DVD players have switching circuits, detection circuits, high-frequency pulse rectifier circuits, etc.

The choice of rectifier diode mainly depends on the required withstand voltage and current, in addition to the package shape, the most important thing is the withstand voltage and current of the rectifier diode.

If it is within 1A, the 1N400X series can be selected, including 1NN4002 and 1N4007, and the rectifier diodes with withstand voltages of 30V, 50V, 100V, 200V, 400V, 600V, 800V, and 1000V are selected.

If the current is greater than 1A but not more than 3A, the 1N580X series can be selected, including 1N N N5402 1N5408, and the withstand voltage is 50V, 100V, 200V, 300V, 400V, 500V, 600V, 800V, and 1000V respectively.

If the current is more than 3A, a Schottky diode with a high current (the maximum current is more than 100A.) There are too many specific models of Schottky diodes to list them one by one).

Rectifier diodes can take advantage of the unidirectional conductivity of the PN junction to turn alternating current into pulsating direct current.

Rectifier diodes have significant unidirectional conductivity. Rectifier diodes can be manufactured from materials such as semiconductor germanium or silicon. The silicon rectifier diode has a high breakdown voltage, low reverse leakage current, and good high-temperature performance.

Rectifier diodes are mainly used in various low-frequency half-wave rectifier circuits, and need to be connected to a rectifier bridge to achieve full-wave rectification.

A rectifier diode is a semiconductor device that converts alternating current energy into direct current energy. Usually it contains a PN junction with two terminals, a positive and a negative. Rectifier diodes are generally planar silicon diodes, which are used in various power supply rectifier circuits.

A rectifier diode allows current to flow in only one direction, and it can convert alternating current into pulsed direct current. For example, if the household mains is alternating current, after connecting a rectifier diode and a light bulb in series, the current flowing through the light bulb is in one direction.

Using this principle, it can be made into mobile phone chargers and so on.

By using the unidirectional conductivity of the diode, it is possible to convert alternating current in alternating directions into pulsating direct current in a single direction.

Rectifier diodes, as the name suggests, are used to convert alternating current into direct current and filter negative waves.

Rectifier rectification, AC to DC.

AC->DC conversion; At the same time, the switch function is started.

It's the rectification effect, which is to turn the alternating current into a positive pulsed direct current.

Because the switching diode has a small current and a high operating frequency, it cannot pass through all VDs, but only a positive half-circumferential waveform can pass through. In the case of low voltage and high current output, the switching diode has a low on-voltage drop and cannot rectify the current.

A diode is an electronic device made of semiconductor materials. 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.

Diodes are one of the earliest semiconductor devices and are used in a wide range of applications. Especially in various electronic circuits, diodes and resistors, capacitors, inductors and other components are reasonably connected to form circuits with different functions, which can realize a variety of functions such as alternating current rectification, modulation signal detection, limiting and clamping, and voltage stabilization of power supply voltage.

How it works. 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.

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, 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-built electric field are equal and are in an equilibrium state.

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 outer and middle bounds, the external electric field and the self-built electric field are further strengthened, forming a reverse saturation current that is independent of the reverse bias voltage value within a certain reverse voltage range.

The above content refers to Encyclopedia-Diode.