Learn about thermistors

　　The resistance of ordinary resistors is little affected by temperature changes, but the thermistor is completely different. Its resistance changes with temperature changes. It is a component that uses temperature to control the resistance of the resistance.

　　A thermistor is a thermal element made by utilizing the characteristic that the resistance value of a semiconductor changes significantly with temperature. It is made from certain metal oxides in different formulations. In a certain temperature range, the temperature change of the measured medium can be known according to the change of the resistance value of the measured thermistor.

　　The thermistor will be in an inactive state for a long time; when the ambient temperature and current are in zone c, the heat dissipation power of the thermistor is close to the heating power, so it may or may not operate. When the ambient temperature is the same, the operating time of the thermistor is shortened sharply with the increase of the current; when the ambient temperature is relatively high, the thermistor has a shorter operating time and smaller holding current and operating current. Thermistors come in many shapes, such as spherical, rod, tube, circle, etc.

　　Types of thermistors: Positive Temperature Coefficient (PTC) and Negative Temperature Coefficient (NTC). The resistance of the PTC thermistor increases as the temperature increases, and the resistance of the NTC thermistor decreases as the temperature increases. Currently the most widely used is the NTC thermistor.

　　main feature

　　It has high temperature sensitivity, small thermal inertia, long life, small size, simple structure, and can be made into various shapes and structures. Therefore, with the development of industrial and agricultural production and science and technology, this component has been widely used, such as temperature measurement, temperature control, temperature compensation, liquid level measurement, air pressure measurement, fire alarm, meteorological sounding, switch circuit, Load protection, pulsating voltage suppression, time delay, stable amplitude, automatic gain adjustment, microwave and laser power measurement, etc.

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