What is the dead zone voltage and what is the dead zone voltage of a diode? Why does the dead zone v

The dead-zone voltage of the diode.

1. Definition: Dead zone voltage refers to when the diode is applied in a specific circuit, due to its own voltage drop, that is, the power supply voltage is less than a certain range when it is not conductive, resulting in the output waveform is defective, from the power supply voltage through the zero point to the output waveform defect disappears, this section of voltage is the dead zone voltage.

2. Application: Dead zone voltage, also known as turn-on voltage, is two names used in different occasions.

1. Add voltage between the positive and negative poles of the diode, and when the voltage is greater than a certain range, the diode begins to turn on, and this voltage is called the turning voltage. Germanium tubes are left and right, silicon tubes are left and right. Dead zone voltage refers to when the diode is applied in a specific circuit, due to its own voltage drop, that is, the power supply voltage is less than a certain range when it is not conductive, resulting in the output waveform is defective, from the power supply voltage through the zero point until the output waveform is defective and disappears, this section of voltage is the dead zone voltage, which is essentially the diode's on-on voltage.

2. When the diode is added with forward voltage, there is a forward current passing through. However, when the forward voltage is very low, the external electric field cannot overcome the resistance formed by the electric field in the PN junction to the diffusion motion of most carriers, and the forward current is very small, and the diode presents a large resistance. When the forward voltage exceeds a certain value (about silicon tube, about germanium tube), the diode resistance becomes very small, and the current increases rapidly.

This voltage is often referred to as the dead zone voltage.

Dead time voltage refers to the range in an AC motor where there is a motor rotor position that prevents the motor from starting or turning at zero speed. In this position, the two adjacent electrodes are turned off at the same time, so that the motor is free of driving force and torque. In other words, the dead voltage is the voltage range that makes the motor need to continue to supply voltage to ensure that the motor can continue to operate during the transition period and the electrode is converted to each other.

The existence of dead zone voltage is caused by the inherent characteristics of the electric drive system of the motor, including the circuit structure and control system of the motor. The dead-zone voltage is especially obvious when the motor is started, because the motor needs to rotate at zero speed, and the dead-zone voltage will make it difficult for the motor to start, and then produce a large starting current and starting time. Dead-time voltages can also cause problems such as oscillation, unsteadyness, and noise while the motor is running.

Therefore, in the design of the motor and the control system, the effect of reducing the dead zone voltage needs to be considered.

In the AC motor control system, the commonly used methods to reduce the dead zone voltage include: changing the circuit structure, increasing the number of thyristors, increasing the PWM modulation frequency, and improving the control accuracy. By erecting these technical means, the influence of dead zone voltage can be effectively reduced, and the operation efficiency and stability of the motor can be improved.

In short, dead zone voltage is an inherent characteristic of the AC motor electric drive system, which can easily lead to problems such as difficulty in motor start-up and unstable lead before torque retention. Methods to reduce the dead-zone voltage include changing the circuit structure, increasing the PWM modulation frequency, etc. By adopting these technical means, the operating efficiency and stability of the motor can be improved, so as to meet the needs of different applications.

Dead zone voltage refers to the fact that even if the forward voltage is added, it must reach a certain size before it starts to be conducted, and this noisy threshold is called dead zone voltage.

When the applied forward voltage UK is very low, the forward current is very small, almost zero, because the external electric field cannot overcome the resistance of the electric field in the PN junction to the diffusion motion of most carriers. When the forward voltage exceeds a certain value, the internal electric field is greatly weakened, and the current grows rapidly.

This forward voltage of a certain value is called the dead zone voltage; Its size is related to the material and the ambient temperature. Usually the dead zone voltage of germanium tubes is about 0 2V, and the dead zone voltage of silicon tubes is about 0 5V.

Dead zone voltage, also known as turn-on voltage and breakdown voltage, are two names used in different occasions. Dead zone voltage refers to the fact that even if the forward voltage is added, it must reach a certain size before it can start to be conducted, and this threshold is called dead zone voltage, silicon tube about, germanium tube about. (Silicon and germanium are the two most commonly used semiconductor materials for making transistors, with more silicon tubes and fewer germanium tubes).

Breakdown mechanism of PN junction.

When the reverse bias of the PN junction is high, an electrical breakdown due to collisional ionization, known as avalanche breakdown, occurs. The free carriers present in the semiconductor crystal are accelerated under the action of the construction of the electric field in the depletion region, and their energy increases until they collide with the semiconductor lattice, and the energy released during the collision process may break the valence bond and generate new electron-hole pairs. If the average electron-hole pairs per electron (or hole) can produce more than 1 pair of electron-hole pairs in the process of passing through the depletion region, then the process can be continuously strengthened, and finally the number of carriers in the depletion region will increase and the pn junction will avalanche breakdown.

It's the same with life.

The pain of the vast majority of people lies in the fact that although they have a good heart, but they are good, but the degree of good is too low, they have not crossed the [dead zone], the adjustment system is still in the [dead zone], they cannot generate great power, they have not really broken down, and they have not really opened up and [opened] a stable and obvious good person causal cycle. So it's very tangled ......

The dead voltage means that if the forward voltage applied to the diode does not exceed that certain value, the diode will not turn on.

The on-voltage of different diodes is not the same, and the on-voltage of LEDs of different colors is also different.

If you want to explain the reason for the appearance of this thing, you probably have to explain it from the molecule, the electron, but I can't explain it.

Dead zone voltage: simply put, it is the voltage that cannot be turned on by the tube below this voltage, and the typical value of the silicon tube is:

Typical values for germanium tubes are:

Dead zone voltage: Because the PN junction has a self-built electric field, the drift of electrons and holes, its internal itself has a certain amount of electrical energy, that is to say, its internal itself has a charge, we use its unidirectional conductivity, in fact, it is to add external voltage to the PN junction, destroying the balance of its internal self-built electric field, of course! This requires a certain voltage value, at least higher than the self-built electric field inside the PN junction.

Also since the material inside the diode is a semiconductor, it has a certain resistance to the voltage. If the voltage is too low, it will not be able to destroy the self-built field inside the PN junction, so the tubes of different materials will have different dead-zone voltages.

[Introduction]:

It is often referred to as deadtime and is often used to avoid false triggering when the power switch control signal is flipped.

Many power management chips will control one or more external power devices, such as MOSFETs or IGBTs, by detecting feedback currents or voltages. These feedback current or voltage signals are often affected by the noise generated when the power device is switched and switched, resulting in the input signal inside the chip superimposed by some spikes caused by the parasitic inductance of the wire and the parasitic capacitance of the chip, which will cause false triggering inside the chip and output wrong control signals.

In order to avoid the influence of spike noise, the operation circuit of the feedback signal is usually shielded during the time from the time when the control signal is flipped over to the end when the feedback signal is stable, which is the dead time.

Design Method]: The dead zone is mainly for the IGBT switch, ideally, the IGBT of the single bridge arm of the inverter is always complementary to the IGBT on and off. However, due to the tailing effect of IGBT during the shutdown process, the shutdown time is relatively longer than the turn-on time.

If the IGBT on the same bridge arm is turned on immediately during the shutdown process, it will inevitably cause the DC bus voltage to be turned on and damage the IGBT. This is more significant in high-frequency switching circuits, therefore, in practical applications, the conduction and shutdown of the upper and lower IGBTs of the same bridge arm are staggered for a certain time, that is, the dead time, to ensure that the upper and lower IGBTs of the same bridge arm are always turned off first and then on.

There are a variety of methods for injecting dead time, such as symmetrical, hybrid, delayed turn-on, and advance turn-on compensation. But the simplest way to do this is time-delay turn-on. Hardware can take an RC delay and an OR gate to achieve; The software can directly call the delay program to achieve it; For the 2000 series DSP, the dead time can be set directly.

The dead-zone voltage of the diode.

The speed of a DC motor is proportional to the armature voltage, but when the voltage is very low, the motor cannot start.

The armature voltage starts from zero, and when it is raised to the point where the motor can rotate, it becomes a "dead zone voltage", meaning that below this voltage, the motor cannot rotate.