Zener diode knowledge introduction introduction topic
A Zener diode (also known as a Zener diode) has the symbol: This diode is a device that is high until the critical reverse breakdown voltage. At this critical breakdown point, the reverse resistance is reduced to a small value. In this low resistance region, the current increases and the voltage remains constant. The Zener diode is binned according to the breakdown voltage because of this characteristic. The Zener diode is mainly used as a voltage reference component. 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 series connection.
Application of Zener:
1. Surge protection circuit (Figure 2): The voltage regulator is broken down at an accurate voltage, which makes it a component that can be used as a limit or protection. Because voltage regulator diodes of various voltages are available, Particularly suitable for this application. The Zener diode D in the figure acts as an overvoltage protection device. As long as the voltage VS exceeds the diode's regulated value D, it is turned on, so that the J-pushing load RL is separated from the power supply.
2, the overvoltage protection circuit in the TV (Figure 3): EC is the main supply voltage of the TV. When the EC voltage is too high, D is turned on, BG is turned on, and its collector potential will be from the original high level ( 5V) goes low, and the TV enters the standby protection state by the control of the standby control line.
3, the arc suppression circuit shown in Figure 4: parallel connection to a suitable Zener diode on the coil (can also be connected to a common diode principle), when the coil is turned off in the conduction state, due to its electromagnetic energy release The generated is absorbed by the diode, so when disconnected, the arc of the switch is eliminated. This application circuit is used more in the industry, such as some higher power electromagnetic control circuits.
4, series regulator circuit (Figure 5): In this circuit, the base of the series regulator BG is clamped at 13V by the Zener diode D, then its emitter will output a constant 12V voltage. This circuit is used in many situations.
A Zener diode (also known as a Zener diode) has the symbol: This diode is a device that is high until the critical reverse breakdown voltage. At this critical breakdown point, the reverse resistance is reduced to a small value. In this low resistance region, the current increases and the voltage remains constant. The Zener diode is binned according to the breakdown voltage because of this characteristic. The Zener diode is mainly used as a voltage reference component. 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 series connection.
Application of Zener:
1. Surge protection circuit (Figure 2): The voltage regulator is broken down at an accurate voltage, which makes it a component that can be used as a limit or protection. Because voltage regulator diodes of various voltages are available, Particularly suitable for this application. The Zener diode D in the figure acts as an overvoltage protection device. As long as the voltage VS exceeds the diode's regulated value D, it is turned on, so that the J-pushing load RL is separated from the power supply.
2, the overvoltage protection circuit in the TV (Figure 3): EC is the main supply voltage of the TV. When the EC voltage is too high, D is turned on, BG is turned on, and its collector potential will be from the original high level ( 5V) goes low, and the TV enters the standby protection state by the control of the standby control line.
3, the arc suppression circuit shown in Figure 4: parallel connection to a suitable Zener diode on the coil (can also be connected to a common diode principle), when the coil is turned off in the conduction state, due to its electromagnetic energy release The generated is absorbed by the diode, so when disconnected, the arc of the switch is eliminated. This application circuit is used more in the industry, such as some higher power electromagnetic control circuits.
4, series regulator circuit (Figure 5): In this circuit, the base of the series regulator BG is clamped at 13V by the Zener diode D, then its emitter will output a constant 12V voltage. This circuit is used in many situations.
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