There is an electronic component related to temperature, which has the appearance of a black disc type, and according to these two characteristics you should guess that it is a thermistor. Thermistor is a temperature sensitive resistor, its resistance value is will change with the change of the surrounding temperature, most thermistors made of single crystal, polycrystalline semiconductor materials, belong to the semiconductor components.
There are many types of thermistors, and according to the temperature coefficient thermistors can be divided into two types of thermistors: positive temperature coefficient and negative temperature coefficient. Positive temperature coefficient thermistors are referred to as PTC thermistors, whose resistance value increases with the rise of temperature within a certain temperature range; negative temperature coefficient thermistors are referred to as NTC thermistors, whose resistance value decreases with the rise of temperature within a certain temperature range.
Since thermistors are highly sensitive to temperature, thermally inert and can work for a long time, they are used in applications such as temperature detection, circuit switching, temperature control and temperature compensation, such as for cooking appliances, air conditioning equipment, hot water supply equipment, printers, car engines, etc.
Thermistors are like clothes, size, volume size and various parameters are different, but also according to the use of the operating temperature range, the workplace to choose the right thermistor, once the choice of inappropriate thermistors, the results either can not be used, or used to damage the circuit and electronic equipment. So want to pick the right thermistor to pay attention to these points.
First, the operating temperature range is different
Different thermistors have different operating temperature ranges, room temperature devices for -55 ℃ ~ 315 ℃, high temperature devices for temperatures higher than 315 ℃, low temperature devices for -273 ℃ ~ -55 ℃, according to the working temperature range to choose the right thermistor.
Second, the use of different workplaces.
Different models of thermistors work on different occasions, PTC thermistors are generally used in refrigerator compressor starting circuit, color picture tube demagnetization circuit, motor overcurrent overheat protection circuit, current limiting circuit and constant temperature electric heating circuit; NTC thermistors in various electronic products for microwave power measurement, temperature check, temperature compensation, temperature control and voltage regulation with.
There are many thermistor models, so you should pay attention when selecting the thermistor model and choose the right one. If you do not know how to choose a thermistor, you can consult an engineer or staff member in the relevant industry, who will provide a suitable solution for your needs.
