一、Basic principles and structures of voltage sensor (Varistor)
Voltage sensitivity, also known as voltage -sensitive resistance, is an electronic component with non -linear resistance characteristics. It has high resistance when low voltage, and is expressed at high voltage at high voltage. Its working principle is based on non -linear materials and is usually made of semiconductor ceramic materials such as zinc oxide (ZNO).
The structure of the voltage -sensitive resistance is generally made of two metal pieces with a layer of zinc oxide ceramics. When the voltage current is applied to the metal sheet, the electrons in zinc oxide ceramics can be made breakthrough, thereby forming a continuous conductivity. This guide circuit will absorb electrical energy under high voltage, effectively protect the connection circuit, and prevent overvoltage from damaging the circuit component.
二、Application of voltage -sensitive resistance
1.Overvoltage protection: Voltage sensitivity resistance is an important overvoltage protection element, which is widely used in power equipment, communication equipment and electronic equipment. In the circuit, the voltage -sensitive resistance is connected to the feed line of the voltage sensor or the circuit input terminal, so as to prevent the destruction of the device when the voltage is needed to prevent the overvoltage from being required.
2.Langyong protection: Because voltage sensitive resistance has fast response and low distortion characteristics, it is widely used to prevent sudden voltage events such as lightning and wave current to protect various electronic equipment and instruments. In this application, the voltage -sensitive resistance plays a role in a voltage limiter in the circuit, and the high voltage is diverted to the ground line.
3.Power voltage voltage: In certain electronic circuits, the voltage -sensitive resistance can also be used as a regulator to maintain the stable work of the circuit. When the input voltage exceeds the set voltage range, the voltage sensitivity resistance begins to play a role, and the overvoltage is shown to the ground line to maintain the stability of the output voltage.
4.Links: Voltage sensitivity can also be used as a circuit damper, which reduces the oscillation and rebound of the circuit by converting the overvoltage energy into thermal energy. This is especially important in high -frequency circuit and signal transmission applications.
三、the basic principles and structures of thermistor (Thermistor)
Thermal resistance is a component of the resistance value with temperature changes, and its working principle is based on the temperature sensitivity of the semiconductor material. Thermal resistance is made of materials such as iron oxide (Fe2O3) or zinc -manganese iron oxygen (ZnMN2O4). The resistance value of these materials will decrease with the increase in temperature.
The structure of thermistor is usually composed of the thermist component covered by conductive materials (such as copper wires). When the temperature rises, the electronic energy level in thermal components will change, resulting in changes in the resistance value. Thermal resistance is widely used in the fields of temperature measurement, temperature control and temperature compensation.
四、the application of thermal resistance
1.Temperature measurement: Thermal resistance can be used as a temperature sensor for measuring the temperature of various objects. According to the changing curve of the resistance value of the thermistor, the temperature value can be derived by measuring its resistance. Common application scenarios include heat -controlling control, heat dissipation monitoring of electronic equipment, and temperature control of home appliances such as refrigerators and air conditioners.
2.Temperature compensation: In certain electronic circuits, temperature can affect resistance and circuit performance. Thermal resistance can be used as a temperature compensator for the working temperature range of stable and regulating circuits. Thermal resistance can adjust the resistance value of the circuit according to the temperature change in the circuit to maintain the stability of the circuit.
3.Temperature compensator: Thermal resistance can also be used in the temperature compensator in the power system to compensate for changes in resistance caused by temperature changes in power equipment. Thermal resistance can achieve this goal by adjusting the circuit impedance to ensure the stability and safety of the power system.
4.Temperature protection: Thermal resistance can be used in the temperature protection circuit. When the temperature is too high, the alarm or cutting the power is triggered or the protection equipment is exempted from damage. This is very important in the fields of electronic equipment, motors, transformers.
In summary, the voltage -sensitive resistance and thermal resistance are based on the characteristics of non -linear materials and temperature sensitive materials, respectively. They play an important role in their respective applications, such as voltage -sensitive resistance for overvoltage protection and surge protection, while thermistor is used for temperature measurement and temperature compensation. Understand the basic principles and applications of voltage -sensitive resistance and thermistor, which helps to reasonably choose and apply these two resistors to meet different circuit needs.
四、the application of thermal resistance
1.Temperature measurement: Thermal resistance can be used as a temperature sensor for measuring the temperature of various objects. According to the changing curve of the resistance value of the thermistor, the temperature value can be derived by measuring its resistance. Common application scenarios include heat -controlling control, heat dissipation monitoring of electronic equipment, and temperature control of home appliances such as refrigerators and air conditioners.
2.Temperature compensation: In certain electronic circuits, temperature can affect resistance and circuit performance. Thermal resistance can be used as a temperature compensator for the working temperature range of stable and regulating circuits. Thermal resistance can adjust the resistance value of the circuit according to the temperature change in the circuit to maintain the stability of the circuit.
3.Temperature compensator: Thermal resistance can also be used in the temperature compensator in the power system to compensate for changes in resistance caused by temperature changes in power equipment. Thermal resistance can achieve this goal by adjusting the circuit impedance to ensure the stability and safety of the power system.
4.Temperature protection: Thermal resistance can be used in the temperature protection circuit. When the temperature is too high, the alarm or cutting the power is triggered or the protection equipment is exempted from damage. This is very important in the fields of electronic equipment, motors, transformers.
In summary, the voltage -sensitive resistance and thermal resistance are based on the characteristics of non -linear materials and temperature sensitive materials, respectively. They play an important role in their respective applications, such as voltage -sensitive resistance for overvoltage protection and surge protection, while thermistor is used for temperature measurement and temperature compensation. Understand the basic principles and applications of voltage -sensitive resistance and thermistor, which helps to reasonably choose and apply these two resistors to meet different circuit needs.
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