The thermistor is a temperature sensing device. As the temperature increases or decreases, its resistance value will change accordingly. Different types of thermistors have different characteristics and uses.
1. Negative temperature difference (NTC) thermistor
The resistance value of NTC thermistor decreases as the temperature increases, and the resistance value at normal temperature is relatively high. It is widely used in environmental temperature detection, electronic equipment temperature control and other fields. NTC thermistors can also form RC circuits with capacitors for transient protection, filtering and interference elimination.
2. Positive temperature difference (PTC) thermistor
The resistance value of PTC thermistor increases as the temperature rises, and the resistance value at normal temperature is relatively low. It is widely used in overcurrent protection, temperature control switches and other fields in power circuits. PTC thermistor can also be used as a resettable fuse.
3. Normal temperature type (type B) thermistor
The resistance value of type B thermistor does not change much as the temperature increases or decreases, and is usually used in the temperature range of 0-50°C. Type B thermistors can be used for temperature detection and temperature control in meteorological instruments, air conditioners, home appliances and other fields.
热敏电阻是一种温度传感器件，随着温度的升高或降低，它的电阻值会发生相应的变化。不同类型的热敏电阻具有不同的特性和用途。
1.负温差（NTC）热敏电阻
NTC热敏电阻的电阻值随着温度升高而下降，在常温下的电阻值相对较高，广泛应用于环境温度检测、电子设备温度控制等领域。NTC热敏电阻还可以与电容器组成RC电路，用于瞬态保护、滤波和干扰消除等。
2.正温差（PTC）热敏电阻
PTC热敏电阻的电阻值随着温度升高而上升，在常温下的电阻值相对较低，广泛应用于电源电路中过流保护、温控开关等领域。PTC热敏电阻还可作为自恢复保险丝使用。
3.常温型（B型）热敏电阻
B型热敏电阻的电阻值随着温度升高或降低变化不大，通常在0-50℃温度范围内应用。B型热敏电阻可以用于气象仪器、空调、家电等领域的温度检测和温度控制。
