Application of Zener Diode

 Zener diode (also called Zener diode) its circuit symbol is: This diode is a semiconductor device with high resistance until the critical reverse breakdown voltage. At this critical breakdown point, the reverse resistance decreases To a very small value, the current increases while the voltage remains constant in this low resistance region. Zener diodes are divided according to the breakdown voltage. Because of this characteristic, the Zener tube is mainly used as a regulator or voltage The reference component is used. Its volt-ampere characteristics are shown in Figure 1. Zener diodes can be connected in series for use at higher voltages, and more stable voltages can be obtained by connecting them in series.

 


　　 Zener tube application:

 

1. Surge protection circuit: Zener tube breakdowns under accurate voltage, which makes it can be used as a limiting or protective element. Because Zener diodes of various voltages are available, it is especially suitable for this application. Appropriate. The voltage stabilizer diode D in the figure is used as an overvoltage protection device. As long as the power supply voltage VS exceeds the diode voltage regulation value D, it will be turned on, so that the relay J pulls in and the load RL is separated from the power supply.


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2. The over-voltage protection circuit in the TV: EC is the main supply voltage of the TV. When the EC voltage is too high, D is turned on, and the transistor BG is turned on, and its collector potential will change from the original high level (5V) to Low level, the TV enters the standby protection state through the control of the standby control line.

 

3. Arc suppression circuit: Connect a suitable zener diode in parallel to the inductance coil (or a common diode can also be connected in the same principle), when the coil is cut off in the conducting state, it will be generated by the release of its electromagnetic energy The high voltage is absorbed by the diode, so when the switch is turned off, the arc of the switch is also eliminated. This application circuit is used more in the industry, such as some higher power electromagnetic attraction control circuits.

 

4. Series voltage stabilizing circuit; in this circuit, the base of the series zener tube BG is clamped at 13V by the zener diode D, then its emitter outputs a constant 12V voltage. This circuit is used in many occasions There are applications.

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