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　　 How big is the thermistor on the induction hob pan?

There are many types of thermistors. Generally, glass-sealed type, epoxy type, small-diameter enameled wire type, etc. are used for temperature measurement. As temperature measurement components of induction cooker, glass-sealed type and other accessories are generally used to form thermistor. Resistor components, negative temperature coefficient thermistors, that is, NTC thermistors, resistance at room temperature is about 100k, there are also 10K, 50K and other specifications, but 100K is used more often, the error is mostly ±1% or ±2 About %, the resistance of NTC thermistor decreases with increasing temperature. The following figure shows the accessories of an induction cooker thermistor temperature probe. In actual use, the thermistor is closely attached to the ceramic plate, and thermally conductive silicone grease is applied to the contact point in order to improve the control sensitivity.

Induction cooker temperature measurement generally adopts A/D port detection. Now many chips have A/D detection function. NTC thermistor is connected in series with another resistor. Using the principle of resistance voltage division, read the AD value, and the voltage division is obtained. Value comparison judges the current temperature. The thermistor of the induction cooker not only measures the temperature, but also protects the safety. When the temperature reaches a certain value, the circuit automatically cuts off the output, and the general manufacturer has an abnormality in the thermistor ( For example, when a short circuit or an open circuit occurs, the corresponding error code will be displayed. This is to find the cause easily during maintenance and inspection.