The working principle of the voltage stabilizing diode

Stabilizing diodeis also called zener diode. This diode is a semiconductor device with high resistance up to the critical reverse breakdown voltage at which the reverse resistance is reduced to a small value in which the current increases Voltage is maintained constant, Zener diodes are based on the breakdown voltage to sub-file, because of this characteristic, the regulator tube is mainly used as a voltage regulator or voltage reference components. Its voltage characteristics shown in Figure 1, Zener diodes can In series in order to use the higher voltage, through the series can be more stable voltage.

Working principle of voltage stabilizing diode

The regulator is regulated by reverse strike zone characteristics of the work, when the zener diode access circuit, if the power supply voltage fluctuations, or other causes in the circuit the voltage changes, voltage across the load will remain basically unchanged. Therefore, the voltage regulator tube in the circuit to reverse connection. The reverse breakdown voltage of the voltage regulator tube is called the stable voltage, and the stable voltage of different types of voltage stabilizer is different, the fixed value of a certain type of voltage stabilizing tube is fixed on the fixed range of the port.

If the power grid voltage rises, the output voltage of the rectifier circuit Usr also increases, which causes the load voltage Usc to rise. Because of the DW regulator and Rfz Usc load in parallel, as long as there is a little less root growth, the Zener Current will increase sharply, the I1 also increased, limiting resistance voltage drop on R1 increases, thus offsetting the increase of Usr, the load voltage Usc basically remained unchanged. Conversely, if the voltage is reduced, cause Usr decreased by Usc also decreased, the current regulator in the I1 decreases sharply decreased, the R1 pressure drop decreases, which offset the decline in Usr, load voltage Usc basic remain unchanged. If the Usr constant and the load current increases, the voltage drop on the R1 increases, resulting in a decrease in the load voltage Usc. Usc as long as a little down, the current in the voltage regulator tube is rapidly reduced, so that the pressure drop on the R1 to be reduced again, so as to maintain the voltage drop on the R1 basically unchanged, so that the load voltage Usc to stable.
Diode reverse series

The funtion of zener diodes reverse series

1. usually in the power amplifier circuit, the base of the power tube b and emitter e is the emitter junction in parallel with the two reverse Zener diode, which is through the transmitter junction input current shunt role of the role of protection.

2. two Zener diodes in series with the anti-parallel circuit can play an over-voltage protection, when the circuit over-voltage, the first breakdown of short-circuit Zener diode.

3. two-way over-voltage protection. This two-way tvs, two-way over-voltage protection circuit is generally used for electronic circuits, in parallel with the protected PN junction to protect the PN from reverse over-voltage hazards.
Role: overvoltage protection, electrostatic protection, voltage clamping, damping effect.

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