With the demand of consumers for household appliances tends to be convenient and time-saving, food processor has become an essential kitchen appliance for every family. In order to monitor the working temperature of food processor in the process of use in real time and avoid accidents caused by high temperature, most manufacturers will use NTC thermistor for temperature monitoring to improve the safety of cooking processor.
NTC thermistor in the food processor is electrically connected with a divider resistor, measuring a voltage value of the divider resistance V1,. When V1 is measured to be less than or equal to a set of the first threshold value, the NTC thermistor is in an open state, and there is no conduction between the power supply and the food processor; When the measurement of V1 is greater than the set first threshold value and less than the set second threshold value, the NTC thermistor is in a temperature control state for monitoring the temperature, and the power supply begins to supply the food processor; When V1 is measured to be greater than or equal to the second threshold value set, the NTC thermistor is in a short-circuit state, and the conduction state between the power supply and the food processor is automatically cut off. When the NTC thermistor is in the temperature control state, the voltage value of the divider resistor is converted to the temperature value of the NTC thermistor, and the temperature value is displayed on the display screen of the food processor.
Food processor achieves the purpose of real-time temperature monitoring through the combination of NTC thermistors and internal control modules.. The following figure shows the relationship between the resistance value of NTC thermistor and the temperature value in the food processor. Due to the resistance value of NTC thermistor decreases with the increase of temperature, and increases on the contrary, the resistance value R2 and the corresponding temperature value can be obtained by measuring V1. When the measurement of V1 = 0, the NTC thermistor is in open circuit state. When V1 is measured to be greater than 0 and less than the voltage value of the power supply V0, NTC thermistor is in the temperature control state; When the measurement of V1 = V0, the NTC thermistor is short-circuited. In this case, the first threshold value is equivalent to 0 and the second threshold value is equivalent to V0.