Understand the Principle of Thermistor in Electric Kettle

Understand the Principle of Thermistor in Electric Kettle

Thermistors can be used as electronic circuit components for temperature compensation of instrument circuits and temperature compensation of thermocouple cold junctions, etc. By using the self-heating characteristic of the NTC thermistor, the automatic gain control can be realized  and the protection circuit of the RC oscillator amplitude stabilization circuit can be created.

PTC thermistors are mainly used for overheat protection of electrical equipment, non-contact relays, constant temperature, automatic gain control, motor start, time delay, automatic degaussing of color TV, fire alarm and temperature compensation, etc. Do you know the principle of the thermistor kettle?

The principle of the electric kettle thermistor is actually very simple. It is to make the component reach a certain temperature through the current, and when the temperature exceeds the specified temperature, the resistance will be increased, thereby reducing the increase of the current or reducing the output of the current. In this way, the kettle can be protected from overflowing or drying out.

In addition to being used as a heating element, the thermistor can also function as a "switch", and is called a "thermal switch". After the current passes through the component, the temperature rises, that is, the temperature of the heating component rises. When the temperature exceeds the Curie point, the resistance increases, thereby limiting the current increase, so the decrease in the current causes the temperature of the component to drop, and the decrease in the resistance value makes the circuit current increase, the component temperature rises, and the cycle repeats.

Therefore, it has the function of keeping the temperature in a specific range, and also acts as a switch. As a heating element, it is used in heaters, electric soldering irons, drying cabinets, air conditioners, etc., and can also protect electrical appliances from overheating. 

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