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Temperature sensors are essential components of many modern electronic systems. They are used to provide feedback to the system, or to detect warnings when temperatures exceed certain predetermined thresholds. However, different temperature sensors have different applications and working principles. This article will discuss the application field and working principle of the PTC thermistor type temperature sensor.

PTC thermistors are made from a ceramic material which contains a small amount of rare earth elements such as cobalt, manganese or iron. Because of their composition, PTC (positive temperature coefficient) thermistors display a distinct change in electrical resistance when exposed to changes in temperature. When the temperature rises, the resistance of the thermistor also rises. This feature makes the thermistor very suitable for temperature compensation or measurement applications.

One of the most common applications of PTC thermistors is in temperature protection systems. This system typically consists of an electronic circuit which contains the thermistor in series with other components. When the temperature of the thermistor exceeds a preset threshold, the resistance of the component increases. This increase in resistance causes a current in the circuit to decrease, which in turn triggers a protection circuit to shut down the system.

PTC thermistors are also used as elements in temperature measurement or control systems. In this application, the temperature of the PTC thermistor is used to measure a controlled zone\'s temperature. When the temperature of the zone exceeds a predetermined threshold, the resistance of the thermistor increases. This increase in resistance will cause a voltage drop, which is then read and used to determine the measured temperature. This type of temperature measurement system can be used to detect temperature fluctuations with great accuracy, and is often used to control the temperature of computer systems, HVAC systems and other electronics.

The working principle of a PTC thermistor is quite simple. As the temperature rises, the resistance of the component increases. This increase in resistance creates a voltage drop, or a voltage spike, depending on the application. When used for temperature protection, the voltage drop will trip the protection circuit, shutting down the system. For temperature measurement, the voltage drop is used to measure the temperature of the controlled area.

In conclusion, PTC thermistors are a type of temperature sensor which use their distinct resistance behavior to provide feedback to the system. These components are very suitable for temperature compensation or measuring applications, and can be used in temperature protection and temperature measurement systems. The working principle of these thermistors is quite simple: when the temperature rises, the resistance of the component increases, which creates a voltage drop or voltage spike depending on the application.

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