Application of thermistor in daily life (Ⅱ)

4. Temperature control 

In the electromechanical protection and control, critical point thermistor is usually connected to relay control loop in series. When a certain device encounters a sudden failure, overload will come out and it can result in temperature increasing. If the thermistor reaches the critical point resistance value and then falls down suddenly, the relay current will be over action current rating and then the relay will start work to cut off and protect the circuit.

5. Temperature protection 

Thermistor plays a key role in the function management of some devices, such as wireless telephone, computer and so on. If the charging resistance value is very large, batteries of these devices can complete charging very fast. But at the same time, there exists an overheating danger. However, if the charging voltage is too low, the battery charging time will be too long to stand. Thermistor used in batteries can detect the overheating resistor or batteries, so the charging speed can be adjusted. As a result, the voltage of battery is very large at the beginning of charging, so that in a relatively short time, it can be charged quickly with a large voltage. When battery arrives in the critical point voltage or temperature, the charging speed can be controlled to decline.

6. Overheat protection

With the size of computer becoming smaller and smaller, motherboard is more and more sensitive to temperature. The motherboard is very close to heating power supply resistor. The continuous improvement of the CPU frequency not only improves the speed of the CPU, but also working temperature. In this occasion, surface encapsulated type thermistor can not only have a fast respond speed, but also play a role of overheat protection, what’s more, it is very easy to use.

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