What does a bidirectional diode do? How to determine the quality of a bidirectional diode?

Bidirectional diodes have a triggering effect, that is, the voltage is high to a certain threshold.

When it is on, it will be turned off quickly, and it will be quickly shut down when it is low. Bidirectional diodes have voltage regulation in both directions.

It's like two Zener diodes.

In reverse series, the reverse breakdown voltage of the stable voltage (i.e., one of the regulator electrodes) can keep the voltage at both ends basically unchanged (within its allowable current range) regardless of whether it is forward or negative.

How to judge the quality of a bidirectional diode: use a multimeter.

A simple estimate shows that it is normal to have no conduction in both directions.

Diode. A diode, a device with two electrodes that allows current to flow in a single direction, is used in many electronic components to apply its rectification function.

I'm in the business of repairs.

How does it work and what does it do?

Answer: When the A termination voltage of the bidirectional Zener diode is positive and the B termination voltage is negative, the Zener diode on the left is forward conduction, which is equivalent to an ordinary diode, the voltage drop on the top is, and the right one is used as the Zener diode. Therefore, the voltage stabilized by this bidirectional Zener diode is the right Zener value.

Conversely, the B termination voltage of the bidirectional Zener diode is positive, and the A termination voltage is negative. The regulator diode on the right is forward conducted, and the regulator diode on the left acts as a regulator diode.

How many volts is a bidirectional regulator?

Answer: I don't know how many volts you want to use in both directions. You string a resistor, like 1k, on your bidirectional regulator and connect it to a regulated power supply, which is slightly higher than the regulator diode voltage.

Then use a multimeter to measure the voltage of the voltage regulator diode, adjust the voltage regulator diode to connect it to the next measure, if the voltage stabilization value is right, the voltage can be stabilized, then the bidirectional voltage regulation is good.

It's too simple to judge whether it's good or bad: as long as you use a higher resistance gear, the resistance value of the pen is infinite, [because there is always a diode that is reversed], if you find that there is a short circuit, it means that it is broken! The one that opens the road rarely appears unless it is burned, it will be burned black, just look at it.

Bidirectional diodes exhibit negative resistance when the applied voltage exceeds a certain value. Learn to use it as a trigger circuit for thyristors in circuits. Its characteristics are in layman's terms:

That is, when the voltage is high to a certain threshold, it will be turned on, and when it is low, it will be quickly turned off. The bidirectional diode can only be simply estimated with a multimeter, and it is normal for the bidirectional non-conduction to be normal.

The two opposing diodes are transient voltage suppression diodes.

A TVS diode, also known as a TVS diode, is a protective electronic component that protects electrical equipment from voltage spikes introduced by wires.

TVS diodes are available in unidirectional and bidirectional directions. Unidirectional TVS diodes resemble commutators when operating in the forward direction, but are designed to withstand large peak currents, and the instantaneous power of the series can reach 1500 W.

A bidirectional TVS diode can be thought of as two avalanche diodes of opposite polarity connected in series and in parallel with the circuit to be protected. Although it is marked as two diodes in the circuit, the actual component is that the two diodes are packaged in the same package.

Principle:

The overvoltage reaction of the TVS diode is faster than that of other overvoltage protection components. The actual clamping is only about one picosecond, but because of the inductance of the wires in the actual circuit, the protective components need to tolerate high voltages for a longer period of time.

As a result, TVS diodes are better suited than other components to protect circuits from fast and damaging voltage surges. Like many distributed circuits, there are such fast overvoltage surges, which can be caused by internal or external factors, such as lightning or short circuits in the motor.

Diode symbols and meanings.

Figure 1 ordinary diode, the first is the domestic standard drawing method;

Figure 2: Bidirectional transient rejection diode;

Figure 3 is a photosensitive or photodiode and a light-emitting diode;

Figure 4 shows a varactor diode;

Figure 5 is a Schottky diode;

Figure 6 is a constant-current diode;

Figure 7 is a regulator diode;

The "Transient Voltage Suppression Diode" actually consists of two regulator tubes, which play the role of "transient high voltage suppression".

However, if it must be emphasized that the original diagram is not wrong, then it is a half-bridge rectifier composed of 2 rectifier diodes, but the middle connection must be wired, otherwise the drawing is also incomplete.

Application of bidirectional two-buried Tanchai pole tube; It is commonly used to trigger bidirectional thyristors, and can also form overvoltage protection circuits, bidirectional trigger diode structure, symbol and equivalent circuits.

Often in the amplification circuit with larger power, the base B of the power tube and the emitter E are connected in parallel with two reverse diodes of the transmitting junction, which is to play a protective role by the shunt effect of the input current of the transmitting junction, and the two diodes can play the role of overvoltage credit protection after the reverse series connection to the circuit in parallel, and when the circuit is overvoltaged, the diode first breaks down and short-circuits.

Bidirectional overvoltage protection, this bidirectional TVS, bidirectional overvoltage protection circuit is generally used in electronic circuits, and the protected PN junction is connected in parallel to protect the PN from the harm of reverse overvoltage, the role is overvoltage protection, electrostatic protection, voltage clamping, damping effect.

If two regulator diodes are connected in reverse series, when the forward and reverse voltage reaches the stable value, the voltage is clamped, and if the two regulator diodes are connected in reverse series, when the forward and reverse voltage reaches the stable value, the current increases sharply, the electrodynamic force increases, and the damping effect is played.

Bidirectional diodes are widely used in the lighting industry, but what is the specific role in lamps? Many people are not particularly clear, after all, they usually don't deal with bidirectional diodes, so what is the role of bidirectional diodes? Today, I will introduce to you the knowledge points about the role of bidirectional diodes.

1. What is the function of a bidirectional diode?

For example, when the voltage in the circuit exceeds the load voltage, the diode will automatically penetrate and short circuit, which can prevent the line from burning, and can also protect some other equipment in the line.

2. What is a bidirectional diode?

3. How to detect the quality of bidirectional diodes.

At present, the resistance of the bidirectional diode can be detected by using the Vientiane meter, if the forward resistance reaches 1k, and the reverse resistance energy is infinite, then it means that the diode is better, if the forward and reverse resistance are infinite, then it means that the diode has been damaged.

When using a multimeter to detect the resistance of a diode, it is possible to use a 2000m resistance unit for detection.

Fourth, what are the models and functions of bidirectional diodes?

One of the more commonly used models is DB3, which has a trigger voltage between 28 volts and 36 volts and an output current of two amps, which is often used in triggering circuits.

5. What are the products of bidirectional diodes?

There are still many bidirectional diode products, people are more familiar with SMD diodes, SMD inductors, SMD light-emitting tubes, when buying bidirectional diode products, we should pay attention to the problem of voltage and current, if the selected voltage and current are not suitable, then the later stage may lead to the product can not shine normally.

Tips: When choosing a bidirectional diode, you must buy the right model according to the occasion, and when connecting the circuit, it is best to choose series or parallel, which can play a protective role.

Hello, dear, glad to answer for you! A bidirectional diode is a special type of diode, also known as a dual-conducting diode or TVS diode. It can operate in both forward and reverse bias and is used to protect circuits from overvoltage and current shocks.

To detect if a bidirectional diode is working properly, you can take the following steps:1Prepare the test circuit:

Use a circuit board or lab bench to connect bidirectional diodes with other electronic components to simulate real-world application environments. 2.Test Forward Bias:

The forward voltage is applied to the forward pin of the bidirectional diode with an appropriate current-limiting resistor. Use an oscilloscope or multimeter to measure the voltage across the bidirectional diode, making sure that it is properly turned on when it is forward biased, and that the voltage crossing it is small and should usually be close to the nominal on-voltage. 3.

Test Reverse Bias: Apply the reverse voltage to the reverse pin of the bidirectional diode, using an appropriate power supply or signal generator. Again, use an oscilloscope or multimeter to measure the voltage across the bidirectional diode, making sure it responds correctly when reverse biased and limits the overvoltage protection voltage to a safe range.

Use an oscilloscope to observe its response speed and protection to ensure that it can quickly turn on and absorb overvoltages in the event of an overvoltage. 5.Check Parameters and Specifications:

Refer to the specification sheet of the bidirectional diode to ensure that the test results match the nominal values, such as forward conduction voltage, reverse breakdown voltage, rated power, etc. Hello, the above is mine for your reference. I hope it will be helpful to you, if you have other questions, you can continue to consult me, I will do my best to answer for you!

Happy life on your land!

A diode is a device with two electrodes that allows only a single direction of current to flow through it, and many are used to apply its rectification function. 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 to block it in reverse direction (known as reverse bias).

Therefore, the diode can be thought of as an electronic version of the check valve.

early vacuum electron diodes; It is an electronic device capable of conducting electrical diversion in one direction. Inside the semiconductor diode, there is a PN junction with two lead terminals, and this electronic device has the conductivity of unidirectional current in the direction of the applied voltage. Generally speaking, a crystal diode is a p-n junction interface formed by the sintering of p-type semiconductors and n-type semiconductors.

A space charge layer is formed on both sides of its interface, which constitutes a self-built electric field. When the applied voltage is equal to zero, the diffusion current caused by the concentration difference between the carriers on both sides of the p-n junction and the drift current caused by the self-created electric field are equal and are in an equilibrium state, which is also a diode characteristic under normal conditions.

There are many types of diodes, which can be divided into detection diodes, rectifier diodes, voltage regulator diodes, switching diodes, isolation diodes, Schottky diodes, light-emitting diodes, etc., according to their different uses. According to the die structure, it can be divided into point contact diode, surface contact diode and planar diode.

Depending on the semiconductor material used, most of today's most common diodes are made using semiconductor materials such as silicon or germanium. It can be divided into silicon diodes (Si tubes) and germanium diodes (GE tubes). Theoretically, semiconductor elements, silicon, germanium, gallium and other elements, plus a small amount of doping, can be made into diode filial piety.