Method for estimating water boiling of electric heating kettle
A technology for electric kettles and kettles, applied to water boiling appliances, instruments, adaptive control, etc., which can solve the problems of safety accidents, heating by heating power supply, and insufficient sensitivity to cut off the heating power supply, so as to achieve the effect of preventing safety accidents
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Embodiment 1
[0019] Embodiment 1, for the electric kettle whose water temperature rises slowly, the power is less than 1200W, the thermistor NTC with negative temperature coefficient is set in the electric kettle, the microprocessor CPU has multi-channel A / D conversion, and the control circuit is the microprocessor. The transistor connected to the output port is powered on, and the sensor detects the temperature of the water in the electric kettle in real time. When the temperature is greater than the initial temperature of 55°C for calculating the temperature change rate, the temperature change rate is calculated, and the temperature and the calculated temperature change are stored. rate, the cycle is set to 10 seconds, and the microprocessor calculates the rate of change of water temperature: the digital quantity representing the water temperature in the first 10 seconds at that time is the subtrahend, and the digital quantity representing the current water temperature is the subtrahend, a...
Embodiment 2
[0020] Embodiment 2, for the electric kettle whose water temperature rises faster, the power is larger than 3000W, the thermistor NTC with negative temperature coefficient is set in the electric kettle, the microprocessor CPU has multiple A / D conversion, and the control circuit is the microprocessor. The transistor connected to the output port is connected to the power supply, and the sensor detects the temperature of the water in the electric kettle in real time. When the temperature is greater than the initial temperature of 66°C for calculating the temperature change rate, the temperature change rate is calculated, and the temperature and the calculated value are stored. Temperature change rate, the period is set to 2 seconds, the microprocessor calculates the water temperature change rate: represents the A / D conversion digital quantity related to the water temperature at that time as the minuend, and represents the A / D conversion digital quantity related to the water tempera...
Embodiment 3
[0021] Embodiment 3, for the electric kettle with medium power water temperature rising speed, 2000W, the thermistor NTC with negative temperature coefficient is set in the electric kettle, the microprocessor CPU band multi-channel A / D conversion, the control circuit is the output port of the microprocessor Connect the transistor, turn on the power, the sensor detects the temperature related to the water temperature in the electric kettle in real time, when its temperature is greater than the initial temperature of the calculated temperature change by 60°C, the temperature change rate is calculated, and the temperature and the calculated temperature are stored Rate of change, the cycle is set to 6 seconds, the microprocessor calculates the rate of change of water temperature: it represents the A / D conversion digital quantity related to the water temperature in the first 6 seconds at that time as the minuend, and represents the A / D conversion digital quantity related to the curre...
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