WO2007033530A1

WO2007033530A1 - Method of controlling the temperature of electrical heating jug

Info

Publication number: WO2007033530A1
Application number: PCT/CN2005/001578
Authority: WO
Inventors: George Zhang; Yaolun Wang
Original assignee: Crastal Technology (Shenzhen) Co., Ltd
Priority date: 2005-09-26
Filing date: 2005-09-26
Publication date: 2007-03-29

Abstract

A method of controlling the temperature of an electrical heating jug comprising the steps of: providing a temperature sensor , a microprocessor , and a controlling circuit in the electrical heating jug; detecting the temperature of the electrical heating jug by the temperature sensor, and transmitting the detected signal to the microprocessor. When the temperature is lower than a predetermined threshold, a signal of starting heating is sent by the microprocessor to the controlling circuit, and when the temperature is equal to or higher than a predetermined threshold, a signal of stopping heating is sent by the microprocessor to the controlling circuit. The microprocessor can compare the actual temperature with the predetermined threshold, and calculate the rate of change of the temperature. According to actual temperature and the rate of change of the temperature, the microprocessor can thereby determine the heating time for the power supply of the electrical heating jug, and complete precisely controlling of the heating time.

Description

Electric kettle insulation control method

The invention relates to a control method of an electric kettle, in particular to an electric kettle heat preservation control method.

Background technique '

The electric kettle brings convenience to people's life and work. When the boiled water is not drunk in time and continues to be placed in the electric kettle for a period of time, the temperature will decrease, affecting the drinking effect. The prior art electric kettle insulation control is temperature. The sensor measures the water temperature. When the water temperature in the electric kettle is low, the control circuit turns on the heating power source, and heats the water in the electric kettle. When the water temperature rises, the heating power source is turned off. The shortcomings of this method are: The temperature control process is not accurate, and the other method is to use PTC heating element and low power heating when it is in the state of heat preservation. This method also has the insufficiency of temperature control. At the office.

Summary of the invention

The object of the present invention is to provide a method for controlling the heat preservation of an electric kettle. The technical problem to be solved is to accurately determine the water temperature and temperature change rate in the electric kettle, and adjust the heating time to: simulate the heating power.

The invention adopts the following technical solutions: The electric kettle insulation control method comprises the following steps: 1. setting a temperature sensor, a microprocessor and a control circuit in the electric kettle; 2. the temperature sensor detects the temperature of the water in the electric kettle in real time, And transmitting the detection signal to the microprocessor; 3. When the water temperature is lower than the set lower limit, the microprocessor sends the control circuit

1

Confirmation The heating signal is output; 4. When the water temperature is higher than or equal to the set upper limit value, the processor sends a signal to the control circuit to stop heating.

After the microprocessor of the present invention sends a heating signal to the control circuit, the actual water temperature is compared with a preset set water temperature. When it is greater than, the microprocessor sends a signal to the control circuit to stop heating; the actual water temperature is set to the set water temperature. When the comparison is less than, the microprocessor calculates the temperature change rate and compares it with a preset set temperature change rate. When it is greater than, the microprocessor sends a signal to stop the heating to the control circuit; calculate the temperature change rate and the set temperature change. When the ratio is less than the ratio, the microprocessor sends a signal to the control circuit to delay the heating.

The microprocessor of the present invention compares the actual water temperature with a preset minimum set water temperature, and continues to compare with the high first set water temperature until the highest set water temperature; the actual water temperature is compared with the current set water temperature. When it is less than, the micro-processing calculates the rate of temperature change at this time.

The microprocessor of the present invention calculates and stores the temperature change rate and stores it with the adjustment amount set value of the current file, and then compares the stored value with the highest adjustment comparison value, and compares with the lower first adjustment value when compared with the lower one. , until the lowest adjustment comparison value; when the stored value is compared with the adjustment comparison value is greater than, the preset heating time matched with the current adjustment comparison value in one cycle is obtained.

The set water temperature of the present invention is divided into five sets, the adjustment amount set value is divided into four sets, the adjustment comparison value is divided into six sets, and the preset heating time is divided into seven sets.

The set water temperature grade of the invention is gradually increased from one to five, and the adjustment quantity set value grade is gradually increased from one to four, and the adjusted comparison value grade is gradually increased from one to six, and the heating time grade is gradually increased from zero to six. When the actual water temperature of the present invention is compared with the first set water temperature, the value stored in the memory is less than zero, and when the actual water temperature is less than the second set water temperature, the microprocessor calculates the temperature change rate and the first adjustment amount at this time. When the set value is added and stored, when the actual water temperature is compared with the third set water temperature, the microprocessor calculates the temperature change rate at this time and adds it to the second adjustment amount set value, and the actual water temperature and the first When the set water temperature is less than the comparison, the microprocessor calculates the temperature change rate at this time and adds and stores the third adjustment amount set value. When the actual water temperature is compared with the fifth set water temperature, the microprocessor calculates this. The temperature change rate is added to the fourth adjustment amount set value and stored; when the stored value is greater than the sixth adjustment comparison value, the heating time is zero, and when the stored value is compared with the fifth adjusted comparison value, the heating is performed. The time is the first preset heating time, when the stored value is compared with the fourth adjusted comparison value is greater than, the heating time is the second preset heating time, and the stored value is compared with the third adjusted comparison value. When the comparison is greater than, the heating time is the third preset heating time, and when the stored value is compared with the second adjusted comparison value, the heating time is the fourth preset heating time, and when the stored value is compared with the first adjusted comparison value, The heating time is the fifth preset heating time, and when the stored value is less than the first adjusted comparison value, the heating time is the sixth preset heating time.

The control circuit of the present invention turns the heating power on or off when receiving a signal from the microprocessor.

The microprocessor of the present invention sets the longest heating time in the cycle, and when the heating time is greater than or equal to the longest heating time, sends a signal to stop the heating to the control circuit; when the heating time is less than the longest heating time, the microprocessor determines the cycle. Whether the counting is full for one cycle, when the full cycle is reached, the temperature change rate is calculated, and the current water temperature is stored, and the current water temperature is compared with the first set water temperature after the heating time is cleared. When the heating time in the current cycle of the present invention is less than the longest heating time in the cycle, the current water temperature is compared with the heat setting water temperature, and when the temperature is greater than the time, the signal for stopping the heating is sent to the control circuit; the current water temperature is compared with the heat setting water temperature. The cycle heating time is continuously compared with the longest heating time.

■ Compared with the prior art, the present invention compares the actual water temperature with the set water temperature by using a microprocessor, and then calculates the temperature change rate according to the actual water temperature and temperature change rate, determines the heat preservation heating time of the electric kettle heating power source, and achieves accurate Controlling the heating time saves energy and improves the control level of the electric kettle.

DRAWINGS

1 is a block diagram of an embodiment of a method for controlling insulation of an electric kettle according to the present invention.

Figure 2-1 is a flow chart of an embodiment of the method for controlling the insulation of the electric kettle of the present invention.

Figure 2-2 is a continuation of Figure 2-1.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Studies have shown that in the process of heat preservation and heating, if the heating time is set to a negative correlation with the temperature and temperature change rate at the initial stage of heating, the heat preservation precision can be improved. The electric kettle insulation control method of the present invention is as shown in FIG. The method includes the following steps: 1. setting a temperature sensor, a microprocessor and a control circuit in the electric kettle; 2. detecting the temperature of the water in the electric kettle in real time, and transmitting the detection signal to the microprocessor; 3. when the water temperature is low At the set lower limit value, the microprocessor sends a heating signal to the control circuit, and when the control circuit receives the signal from the microprocessor, turns on the heating power source; 4. When the water temperature is higher than or equal to the set upper limit value When the microprocessor sends a signal to the control circuit to stop heating, the control circuit receives the microprocessor When the signal is turned off, turn off the heating power.

As shown in Figure 2-1 and Figure 2-2, the microprocessor first determines whether it has entered the heating phase. If not, it determines whether the water temperature is greater than the predetermined value. If it is less, it sends a heating signal to the control circuit to turn on the power supply.

• The microprocessor compares the actual water temperature with the set water temperature set by the pre-fraction. First, compare the actual water temperature with the preset minimum set water temperature. When it is greater than, continue to compare with the high first set water temperature until When the maximum set water temperature is still greater than, the microprocessor sends a signal to stop the heating to the control circuit. The set water temperature is divided into five sets, and the value is gradually increased from one to five. When the actual water temperature is less than the current set water temperature, The microprocessor calculates the temperature change rate at this time and adds it to the adjustment value set value of the current file, and stores the adjustment amount set value in four steps, the value is gradually increased from one to four, and then the stored value is The highest adjustment comparison value is compared. When it is less than, it continues to compare with the lower first adjustment comparison value until the lowest adjustment comparison value, and the adjustment comparison value is divided into six sets, and the value is gradually decreased from six to one; the stored value and the adjusted comparison value are performed. When the comparison is greater than, the heating time is set in the period corresponding to the current gear adjustment comparison value, and the heating time is set in seven steps. The time is gradually increased from zero to seven.

When the actual water temperature is compared with the first set water temperature, the value stored in the memory is zero, and when the actual water temperature is less than the second set water temperature, the microprocessor calculates the temperature change rate and the first adjustment amount at this time. The fixed values are added and stored. When the actual water temperature is compared with the third set water temperature, the microprocessor calculates the temperature change rate at this time and adds and stores the second adjustment amount set value, the actual water temperature and the fourth setting. When the water temperature comparison is less than, the microprocessor calculates the temperature change rate at this time and adds it to the third adjustment amount set value, and stores the actual water temperature and the first 5. When the water temperature is set to be less than the comparison, the microprocessor calculates the temperature change rate at this time and adds and stores the fourth adjustment amount set value; when the stored value is greater than the sixth adjustment comparison value line, the heating time is zero. When the stored value and the fifth adjusted comparison value are I: 匕 is larger than, the preset heating time is the first preset heating time, and when the stored value is compared with the fourth adjusted comparison value, the preset heating time is the second preset. When the heating time is compared with the third adjustment comparison value, the preset heating time is the third preset heating time, and when the stored value is compared with the second adjustment comparison value, the preset heating time is the fourth preset. When the heating time is compared with the first adjustment comparison value, the preset heating time is the fifth preset heating time, and when the stored value is less than the first adjustment comparison value, the preset heating time is the sixth preset. heating time.

The purpose of setting the water temperature in the binning is to set the different adjustment amount in the temperature of different gears. The higher the temperature, the larger the setting value is. The larger the memory value is, the shorter the preset heating time is. The relationship between the preset heating time and the temperature is negatively correlated, which is convenient for comparison with the same set of adjustment comparison values. The actual water temperature can also be compared with the set water temperature. When it is less than, the microprocessor calculates the temperature change rate and compares it with a preset set temperature change rate. When it is greater than the microprocessor sends a stop heating to the control circuit. The signal, when the calculated temperature change rate is less than the set temperature change rate, the microprocessor sends a signal to the control circuit to delay the heating. When the heating time is greater than or equal to the preset heating time, the microprocessor sends a signal to stop the heating to the control circuit; when the heating time is less than the preset heating time, the microprocessor determines whether the cycle count is full for one cycle, when the full cycle is reached, Calculate the temperature change rate, and store the current water temperature. After the heating time is cleared, the current water temperature is compared with the first set water temperature. When the cycle time does not reach the full cycle, the current water temperature and the fifth setting are set. When the water temperature is compared, the signal for stopping the heating is sent to the control circuit when the current temperature is greater than when the current water temperature is less than the fifth set water temperature, and the heating time in the cycle is compared with the preset heating time.

Claims

Rights request

1. An electric kettle insulation control method, comprising the following steps: 1. setting a temperature sensor, a microprocessor and a control circuit in the electric kettle; 2. detecting the temperature of the water in the electric kettle in real time, and transmitting the detection signal to Microprocessor; 3. When the water temperature is lower than the set lower limit value, the microprocessor sends a heating signal to the control circuit; 4. When the water temperature is higher than or equal to the set upper limit value, the microprocessor controls The circuit sends a signal to stop heating.

2 . The method according to claim 1 , wherein when the microprocessor sends a heating signal to the control circuit, the actual water temperature is compared with a preset set water temperature. The microprocessor sends a signal to stop the heating to the control circuit; when the actual water temperature is less than the set water temperature, the microprocessor calculates the temperature change rate and compares it with a preset set temperature change rate. The device sends a signal to stop the heating to the control circuit; when the temperature change rate is less than the set temperature change rate, the microprocessor sends a signal to the control circuit to delay the heating.

3. The electric kettle insulation control method according to claim 2, wherein the microprocessor compares the actual water temperature with a preset minimum set water temperature, and continues to operate with a higher first set water temperature when greater than Compare, until the highest set water temperature; when the actual water temperature is less than the current set water temperature, the microprocessor calculates the temperature change rate at this time.

4. The electric kettle insulation control method according to claim 3, wherein the microprocessor calculates a temperature change rate and adds and stores the adjustment amount set value of the current file, Then compare the stored value with the highest adjusted comparison value, and continue to compare with the lower first adjustment comparison value until the lowest adjustment comparison value; when the stored value is compared with the adjustment comparison value, the acquisition is in one cycle and current Adjust the preset heating time in conjunction with the comparison value.

5. The electric kettle insulation control method according to claim 4, wherein the set water temperature is set in five steps, the adjustment amount setting value is set in four steps, the adjustment comparison value is divided into six sets, and the preset heating is performed. The time is set in seven steps.

6 . The method according to claim 5 , wherein the set water temperature grade is gradually increased from one to five, and the set value of the adjustment amount is gradually increased from one to four, and the comparison value is adjusted from one to six. Gradually increasing, the heating time grade is gradually increased from zero to six.

7. The electric kettle insulation control method according to claim 6, wherein the actual water temperature is compared with the first set water temperature when the storage value is less than zero, and the actual water temperature is compared with the second set water temperature. When it is less than, the microprocessor calculates the temperature change rate at this time and adds and stores the first adjustment amount set value. When the actual water temperature is compared with the third set water temperature, the microprocessor calculates the temperature change rate at this time. The second adjustment amount set value is added and stored, and when the actual water temperature is compared with the fourth set water temperature, the microprocessor calculates the temperature change rate at this time and adds the third adjustment amount set value and stores the actual water temperature. When the comparison with the fifth set water temperature is less than, the microprocessor calculates the temperature change rate at this time and adds and stores the fourth adjustment amount set value; when the sixth adjustment comparison value is stored for comparison, the heating time is zero. When the stored value is compared with the fifth adjusted comparison value, the heating time is the first preset heating time, and the stored value is compared with the fourth adjustment value. When the comparison is greater than, the heating time is the second preset heating time, and when the stored value is compared with the third adjusted comparison value, the heating time is the third preset heating time, and the stored value is compared with the second adjusted comparison value. When the heating time is the fourth preset heating time, when the stored value is compared with the first adjusted comparison value is greater than, the heating time is the fifth preset heating time, and the stored value is compared with the first adjusted comparison value is less than, the heating time is The sixth preset heating time.

The electric kettle insulation control method according to any one of claims 1 to 7, wherein the control circuit turns on or off the heating power source when receiving the signal from the microprocessor.

9. The electric kettle insulation control method according to claim 8, wherein the microprocessor sets the longest heating time in the cycle, and when the heating time is greater than or equal to the longest heating time, the control circuit is issued. Stop heating signal; When the heating time is less than the longest heating time, the microprocessor determines whether the cycle count is full for one cycle. When the full cycle is reached, the temperature change rate is calculated, and the current water temperature is stored, and the current time is cleared after the heating time is cleared. The water temperature is compared to the first set water temperature.

10 . The method according to claim 9 , wherein when the heating time in the cycle is less than the heating time in the cycle, the current water temperature is compared with the heat setting water temperature, which is greater than The signal is sent to the control circuit to stop heating; when the current water temperature is compared with the heat setting water temperature, the heating time in the cycle is continuously compared with the longest heating time.