Zener diode overvoltage protection circuit is a kind of protection circuit commonly used in electronic equipment. Its main function is to protect the components in the circuit from overvoltage damage. In the circuit, when the voltage exceeds a certain set value, the zener diode overvoltage protection circuit will automatically cut off the circuit to prevent damage to other electronic components caused by excessive voltage.
The zener diode overvoltage protection circuit is usually composed of SAA7113H It is composed of zener diode, resistor, capacitor and other components. Zener diode is a special diode, which has a high breakdown voltage, usually between a few volts and several hundred volts. When the voltage exceeds the breakdown voltage of the zener diode, the zener diode will automatically turn on and consume the excess voltage through itself, thus protecting other electronic components.
The overvoltage protection circuit of zener diode mainly has the following functions:
1. Protect the components from overvoltage damage: the voltage stabilizing diode overvoltage protection circuit can prevent the components in the circuit from being damaged by excessive voltage. When the voltage exceeds the breakdown voltage of the zener diode, the zener diode will be turned on immediately, and the excess voltage will be consumed by itself, thus protecting other components from the impact of excessive voltage.
2. Improve the reliability of equipment: the overvoltage protection circuit of voltage stabilizing diode can improve the reliability of electronic equipment. In the circuit, if there is no overvoltage protection circuit, when the voltage exceeds the range that the equipment can withstand, the electronic components may be damaged by excessive voltage impact, resulting in the equipment can not work normally. The voltage stabilizing diode overvoltage protection circuit can cut off the circuit in time to avoid damage to the equipment caused by excessive voltage, thus improving the reliability and service life of the equipment.
3. Prevent the impact of voltage fluctuation on equipment: voltage fluctuation often exists in power system, such as sudden increase or decrease of power supply voltage. This voltage fluctuation may affect the normal operation of the equipment. The zener diode overvoltage protection circuit can sense the change of voltage in time, and quickly cut off the circuit to avoid the impact of too high or too low voltage on equipment.
4. Prevent circuit short circuit or overload: The voltage stabilizing diode overvoltage protection circuit can also prevent circuit short circuit or overload. When a short circuit or overload occurs in the circuit, the voltage will rise rapidly, exceeding the range that the element can bear, thus causing damage to the element. The voltage stabilizing diode overvoltage protection circuit can cut off the circuit in time to avoid damage to electronic components caused by short circuit or overload.
5. Reduce maintenance cost: the overvoltage protection circuit of the zener diode can reduce the damage and failure of the equipment, thus reducing the maintenance cost. If there is no overvoltage protection circuit, when the voltage exceeds the range that the equipment can withstand, the equipment may be damaged, and maintenance or component replacement is required, increasing the maintenance cost. The overvoltage protection circuit of the zener diode can cut off the circuit in time to prevent the equipment from being damaged by excessive voltage, reduce the frequency of maintenance and replacement, and reduce the maintenance cost.
In a word, the zener diode overvoltage protection circuit plays an important role in electronic equipment, which can protect components from overvoltage damage, improve the reliability of equipment, prevent the impact of voltage fluctuations on equipment, prevent circuit short circuit or overload, and reduce maintenance costs. Therefore, in the design of electronic equipment, it is very important to reasonably use the voltage stabilizing diode overvoltage protection circuit.
