4 application circuits of voltage regulator tube



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, in this low resistance region, the current increases while the voltage remains constant. 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 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, in this low resistance region, the current increases while the voltage remains constant. 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.

Application of voltage regulator tube:

1. Surge protection circuit (as shown in Figure 2): The Zener diode breaks down under an accurate voltage, which makes it can be used as a limiting or protective element, because Zener diodes of various voltages are available, so It is particularly suitable for this application. The Zener diode D in the figure is used as an overvoltage protection device. As long as the power supply voltage VS exceeds the diode’s voltage regulation value D, it will be turned on, so that the Relay J pulls the load RL and separates it from the power supply.

4 application circuits of voltage regulator tube

2. The overvoltage protection circuit in the TV (see Figure 3): 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 be changed from the original high level. (5V) becomes low level, and the TV enters the standby protection state through the control of the standby control line.

4 application circuits of voltage regulator tube

3. The arc suppression circuit is shown in Figure 4: If a suitable Zener diode is connected in parallel to the inductance coil (the principle of an ordinary diode can also be connected), when the coil is cut off in the conducting state, due to its electromagnetic energy The high voltage generated by the release 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 industry, such as some higher power electromagnetic suction control circuits. To it.

4 application circuits of voltage regulator tube

4. Series voltage regulator circuit (Figure 5): In this circuit, the base of the series regulator tube BG is clamped at 13V by the Zener diode D, and then its emitter outputs a constant 12V voltage. This circuit Used in many occasions

4 application circuits of voltage regulator tube

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, in this low resistance region, the current increases while the voltage remains constant. 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.

Application of voltage regulator tube:

1. Surge protection circuit (as shown in Figure 2): The Zener diode breaks down under an accurate voltage, which makes it can be used as a limiting or protective element, because Zener diodes of various voltages are available, so It is particularly suitable for this application. The Zener diode D in the figure is used as an overvoltage protection device. As long as the power supply voltage VS exceeds the diode’s voltage regulation value D, it will be turned on, so that the relay J pulls the load RL and separates it from the power supply.

4 application circuits of voltage regulator tube

2. The overvoltage protection circuit in the TV (see Figure 3): 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 be changed from the original high level. (5V) becomes low level, and the TV enters the standby protection state through the control of the standby control line.

4 application circuits of voltage regulator tube

3. The arc suppression circuit is shown in Figure 4: If a suitable Zener diode is connected in parallel to the inductance coil (the principle of an ordinary diode can also be connected), when the coil is cut off in the conducting state, due to its electromagnetic energy The high voltage generated by the release 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 industry, such as some higher power electromagnetic suction control circuits. To it.

4 application circuits of voltage regulator tube

4. Series voltage regulator circuit (as shown in Figure 5): In this circuit, the base of the series regulator tube BG is clamped at 13V by the Zener diode D, and then its emitter outputs a constant 12V voltage. This circuit Used in many occasions

4 application circuits of voltage regulator tube

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