If a constant current source is added at both ends of the diode, can the diode be turned on? 30

The diode has unidirectional conductivity, so as long as a positive voltage is applied at both ends of the diode, it will be turned on, and there will be a current flowing through the diode after it is turned on, and the tube voltage drop after the diode is normally turned on will be very small, if the tube voltage drop is large, it means that the conduction characteristics of the diode are not very good, if the diode is broken down, the tube has been turned on without applying a forward voltage, and the control characteristics have been lost. If the forward voltage is applied and it does not turn on, it is possible that the tube will be disconnected.

The diode is unidirectional, not bidirectional, so when using the diode, you must pay attention to the direction of the current and the direction of the diode.

Diodes are also known as crystal diodes, referred to as diodes, in addition, there are early vacuum electron diodes; It is an electronic device that conducts current 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 according to 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. Semiconductor diodes are used in almost all electronic circuits, which play an important role in many circuits and are also widely used.

Diodes are unidirectional and independent of the current source. If the direction of the current is the same as the direction of the diode, it can be turned on, otherwise there is a possibility of breakdown.

It depends on the direction of the current, if the direction of the current is the same as the direction of the diode's unidirectional conduction, it can be turned on, otherwise it will not work.

Not conductive, the conduction of any crystal diode must have a voltage drop, according to the material, germanium tube, silicon tube voltage at both ends will only be conductive when it reaches and exceeds this, in the same way, the voltage obtained in the rectifier circuit should also be subtracted from the number of tubes used and the product of the voltage drop of a single tube.

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.

Varactor diodes (VAFIC diodes) are used as electronic tunable capacitors. 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.

Only in the case of a short circuit in this diode damage will the voltage be the same.

Diode on-voltage: After the diode is turned on forward, its forward voltage drop remains basically unchanged (silicon tube, germanium tube.

Under normal circumstances, the forward conduction voltage drop of the diode cannot be 0V. The diode is generally composed of two materials, silicon and germanium, the forward conduction voltage drop of silicon material diode is generally about about that, and the forward conduction voltage drop of germanium material diode is generally about about that, but it cannot be achieved at zero volts (ideal state).

Diodes are one of the earliest semiconductor devices and are used in a wide range of applications. In particular, in various electronic circuits, diodes are used to make appropriate connections with resistors, capacitors, inductors, and other components.

Circuits with different functions can realize a variety of functions such as AC rectification, modulation signal detection, limiting and clamping, and voltage regulation of power supply voltage. Diodes can be found in common radio circuits or in other household appliances or industrial control circuits.

The diode on-voltage is that after the diode is turned on forward, its forward voltage drop remains basically unchanged. Forward CharacteristicsIn electronic circuits, the positive pole of the diode is connected to the high potential end and the negative terminal is connected to the low potential end, and the diode will be turned on, and this connection method is called forward bias. It must be noted that when the forward voltage applied to both ends of the diode is very small, the diode still cannot be conducted, and the forward current flowing through the diode is very weak.

Characteristics of the diodeThe biggest characteristic of diodes is that they are unidirectional, so they are widely used in rectifier circuits, switching circuits, protection circuits, etc. The so-called unidirectional conductivity means that when the reverse voltage is connected to both ends of the pn junction of the diode, the diode is cut off, and the diode can be turned on when a certain value of forward voltage is connected to both ends of the pn junction. This certain value of forward voltage is the forward conduction voltage drop of the diode.

In college, the diode conduction voltage drop is often identified, but in fact, the forward conduction voltage drop of the diode is not fixed, but is related to the current and ambient temperature flowing through the diode.

Summary. Pro-<>

Hello, I am glad to answer [ ] It is not possible to add diodes directly to both ends of the power supply. An important feature of diodes is that they are unidirectional conductive. The forward conduction voltage drop of the diode made of silicon material is generally not exceeded, and that of germanium material is even lower.

The current experienced by the diode is equivalent to the short-circuit current of the power supply. If the power supply is low, the power supply is pulled down to near shutdown and the circuit stops working. If the power supply capacity is large, the diode will burst out in an instant.

Of course, if it is connected to a signal circuit for clamping purposes, the potential of the backstage component is limited to its forward voltage drop. Only in this case is a purely forward connection permissible.

Is it possible to add diodes directly to both ends of the power supply?

Hello dear<> I'm glad to answer for you [ ] You can't add diodes directly to both ends of the power supply. An important feature of diodes is that they are unidirectional conductive. The forward conduction voltage drop of the diode made of silicon material is generally not exceeded, and that of germanium material is even lower.

The current experienced by the diode is equivalent to the short-circuit current of the power supply. If the power supply is low, the power supply is pulled down to near shutdown and the circuit stops working. If the power supply capacity is large, the diode will burst out in an instant.

Of course, if it is connected to the letter and dismantle circuit for clamping, the potential of the post-amp element will be limited to its forward travel mill slip voltage drop. Only in this case is a purely forward connection permissible.

The correct connection of the diode: The positive connection of the diode is that the positive potential is connected to the positive pole of the soak diode, and the negative potential is connected to the negative pole of the diode. In terms of circuit principle, the positive electrode of the two-volume denier electrode is at a high potential and the negative electrode is at a low potential, which is the positive connection of the diode.

The diode has the limitation of high current in the forward direction; There is a Zui limit of the reverse voltage; Today's diodes are basically found in rectifier circuits and integrated circuits. <>

a.That's right. b.Mistake.

Correct Answer: a

The diode in the title is on.

First of all, assuming that the diode is cut-off, with the 0 end as the reference point, the anode (positive) voltage of the diode is 10V, the cathode (negative end) is 8V, and the anode voltage is higher than the cathode voltage, the assumption is not true, so the diode is on. The voltage at both ends of the ideal diode is 0 when it is turned on, so the potential at point A is 8V and the output voltage is 8V.

Ordinary diodes are generally forward conduction and reverse cut-off, which is determined by the action of p n junction, for specific reference.

Using different doping processes, p-type semiconductors and n-type semiconductors are fabricated on the same semiconductor (usually silicon or germanium) substrate through diffusion, and a space charge region called pn junction is formed at their interface. The PN junction is unidirectionally conductive. P is the abbreviation of positive, and n is the abbreviation of negative, indicating the characteristics of the positive load and the load on the function.

P-type semiconductor (P refers to positive, positively charged): It is composed of monocrystalline silicon doped with a small amount of trivalent elements through a special process, which will form positively charged holes inside the semiconductor; N-type semiconductor (n refers to negative, negatively charged): It is composed of monocrystalline silicon mixed with a small amount of pentavalent elements through a special process, which will form negatively charged free electrons inside the semiconductor.

In p-type semiconductors, there are many positively charged holes and negatively charged ionized impurities. Under the action of an electric field, the holes are movable, while the ionized impurities (ions) are immobile. There are many movable negative electrons and fixed positive ions in n-type semiconductors.

When p-type and n-type semiconductors come into contact, holes near the interface diffuse from p-type semiconductors to n-type semiconductors, and electrons diffuse from n-type semiconductors to p-type semiconductors. Holes and electrons meet and reunite, and carriers disappear. Therefore, there is a distance in the junction region near the interface where there are no carriers, but there are charged fixed ions distributed in space, which is called the space charge region.

The space charge on one side of the p-type semiconductor is a negative ion, and the space charge on the side of the n-type semiconductor is a positive ion. The positive and negative ions generate an electric field near the interface, which prevents the carriers from spreading further and reaches equilibrium. If a voltage is added to the pn junction, if the p-type is connected to the positive pole on one side and the n-type is connected to the negative electrode on the other side, the current will flow from the p-type side to the n-type side, and the holes and electrons will move towards the interface, so that the space charge region will be narrowed, and the current can pass through smoothly.

If the n-type is connected to the positive pole of the applied voltage on one side and the p-type is connected to the negative pole on the other, both the holes and the electrons move away from the interface, so that the space charge region is widened and the current cannot flow through. This is the unidirectional conductivity of the PN junction. When the reverse voltage is applied to the PN junction, the space charge region becomes wider, and the electric field in the region is enhanced.

When the reverse voltage increases to a certain level, the reverse current increases suddenly. If the external circuit does not limit the current, the current will be so large that the PN junction will be burned. The voltage when the reverse current increases suddenly is called the breakdown voltage.

There are two basic breakdown mechanisms, namely tunnel breakdown (also called Zener breakdown) and avalanche breakdown, the former has a breakdown voltage of less than 6V and has a negative temperature coefficient, and the latter has a breakdown voltage greater than 6V and has a positive temperature coefficient. When the PN junction is reverse, the positive and negative charges in the space charge region constitute a capacitive device. Its capacitance varies with the applied voltage.