What is the pressure drop of a transistor and what is the saturation pressure drop in a transistor

The tube voltage drop UCE means that the voltage between the collector and the emitter is normal.

The saturation voltage drop is that the current base current of the triode is greater than the maximum saturation current of the base stage, and we call the judgment circuit in a saturated state.

The specific judgment method is as follows:

In practice, ib* =v r is often used as a condition for judging critical saturation. The IB value calculated according to IB* =V R only makes the transistor enter the initial saturation state, which should actually be taken several times more than this value to achieve true saturation; The greater the multiplier, the deeper the saturation.

2.The greater the collector resistance of the transistor, the easier it is to reach saturation.

3.There are two types of phenomena in the saturation region: both PN junctions are positively biased, and the IC is not controlled by IB.

4.When judging saturation, the maximum saturation current of the base stage should be calculated, and then the current base current should be calculated according to the actual circuit.

In fact, the tube voltage drop is the voltage difference between the two poles of the tube.

The tube voltage drop is understood as the voltage at both ends as the current passes through. The change in potential of the current after it has passed through the load relative to the same reference point is called the voltage drop, or voltage drop for short. The potential difference between the two ends of the load can be considered as the voltage drop.

The voltage drop is the driving force behind the flow of current. If there is no voltage drop, there is no flow of current.

The method of detecting the pressure drop of the compressor tube of the air conditioner is as follows: positive destruction.

1. Turn on the switch of the pressure gauge and connect the hoses to the maintenance valve joints on the air conditioner.

2. After connection, you can see that there are two rows of circular numbers on the dial, divided into red and blue, plus a pointer.

3. The red is the degree of high pressure, and the blue is the degree of low pressure, and the numbers generally said are low pressure.

4. When any air conditioner using Freon 22 is running in the state of refrigeration, the pressure at the ambient temperature of 25 degrees to 45 degrees should be reached.

5. The scale on the table is the pressure, and the exhaust pressure and inlet pressure of the compression width machine can be known through the pressure display. <>

The tube voltage drop of the diode is still a resistance in its essence, but the resistance is very small when it is on, and it is close to infinity when it is not conducted, and the resistance when it is on will share a certain voltage, so it is called the tube voltage drop.

The voltage drop of the diode is that the diode will not turn on below this voltage, and will turn on above this voltage. The forward voltage drop of the diode at a specified forward current.

The forward lowest voltage that enables the diode to be turned on, the forward voltage drop of the low-current silicon diode is at a moderate current level, about V; Germanium diodes are about v. The forward voltage drop of high-power silicon diodes often reaches 1V.

The tube pressure drop of the diode: the forward tube pressure drop of the silicon diode (non-light-emitting type), the forward tube pressure drop of the germanium tube is, and the forward tube pressure drop of the light-emitting diode will be different with different light emitting colors.

There are three main colors, and the specific voltage drop reference values are as follows: the voltage drop of the red LED is, the voltage drop of the yellow LED is, and the voltage drop of the green LED is, and the rated current is about 20mA when emitting light normally.

It is an electron tube such as 2-transistor, 3-transist.

To put it simply, it is equal to the on-voltage of the tube, if a diode is connected in series in a circuit, if the current of this circuit passes through the sliding diode, the circuit is on. At this time, the voltage at both ends of the diode is its on-voltage, such as the empirical value.

The voltage drop of the diode is mainly to guide the on-voltage drop, and after the diode is turned on, its forward voltage drop basically remains unchanged (silicon tube, germanium tube.

Forward characteristics: In 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, which 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.

Only when the forward voltage reaches a certain value (this value is called the "threshold voltage", also known as the "dead zone voltage", the germanium tube is about, the silicon tube is about the same), the diode can really be turned on. The voltage across the diode remains essentially the same after turn-on (about germanium tubes, about silicon tubes, and is called the "forward voltage drop" of the diode).

Reverse trait Banquet Bucket:

In electronic circuits, the positive pole of the diode is connected to the low potential end, and the negative terminal is connected to the high potential end, at this time there is almost no current flowing through the diode, and the diode is in a cut-off state at this time, this connection method is called reverse bias.

When the diode is in reverse bias, there is still a weak reverse current flowing through the diode, which is called leakage current. When the reverse voltage at both ends of the diode increases to a certain value, the reverse current will increase sharply, and the diode will lose its unidirectional conductivity, which is called the breakdown of the diode.

Conduction voltage drop: The electrical voltage corresponding to the diode when it starts to be conducted.

Forward characteristics: When the forward voltage is applied to the diode, the forward voltage is small at the beginning of the forward characteristic, which is not enough to overcome the blocking effect of the electric field in the PN junction, and the forward current is almost zero. When the forward voltage is large enough to overcome the PN junction electric field, the diode conducts hail and the current rises rapidly as the voltage increases.

Reverse characteristic: When the applied reverse voltage does not exceed a certain range, the current through the diode is the reverse current formed by the drifting motion of several carriers of the low-source type. Since the reverse current is small, the diode is in a cut-off state.

When the reverse voltage increases to a certain extent, the diode reverses through breakdown.