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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., can solve problems such as safety accidents, restrictions on the overall appearance design, and failure to reach the boiling temperature of water, so as to prevent safety accidents Effect

Active Publication Date: 2006-03-01
深圳市北鼎晶辉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Electric kettles bring convenience to people's life and work. The traditional method of judging and controlling water boiling is to use a steam switch made of bimetallic sheets. After the water boils, there must be enough water vapor to make the steam switch act and cut off. Heating power supply, the disadvantages of this method are: due to the need for sufficient water vapor to enter the steam switch, the steam channel and movement mechanism are increased, which limits the overall appearance design, and when the heating power supply is cut off after the water boils not sensitive enough
The disadvantage of this method is: at a higher altitude, even if the water boils, it will not reach the set water boiling temperature, and the heating power supply will continue to heat, which will cause a hidden danger of safety accidents.
In addition, generally due to the existence of the error of the sensor for measuring the water temperature, it is very easy to produce the phenomenon that the water cannot be turned off when the water is boiling, or the power is turned off when the water is not boiling.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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 period 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 curr...

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PUM

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Abstract

The method for judging electric kettle water boiling includes the following steps: 1. mounting sensor, microprocessor and control circuit in the electric kettle; 2. utilizing sensor to detect water temperature, temperature of heating bottom disk contacted with water or temperature of side wall of electric kettle; 3. utilizing microprocessor to calculate water temperature change rate and making comparison; and 4. when the water temperature change rate is stable and minimum, giving out signal to control circuit to cut off power supply for heating.

Description

technical field [0001] The invention relates to a control method of an electric kettle, in particular to a method for judging the boiling of water in the electric kettle. Background technique [0002] Electric kettles bring convenience to people's life and work. The traditional method of judging and controlling water boiling is to use a steam switch made of bimetallic sheets. After the water boils, there must be enough water vapor to make the steam switch act and cut off. Heating power supply, the disadvantages of this method are: due to the need for sufficient water vapor to enter the steam switch, the steam channel and movement mechanism are increased, which limits the overall appearance design, and when the heating power supply is cut off after the water boils Not sensitive enough. Another method for judging the boiling of water in the electric kettle of the prior art is to use a sensor to measure the water temperature. When the water temperature in the electric kettle r...

Claims

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Application Information

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IPC IPC(8): G05B13/02G05B15/02A47J27/21
Inventor 张默晗王耀伦
Owner 深圳市北鼎晶辉科技有限公司
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