WO2007028281A1 - Procede de commande pour empecher une bouilloire de bouillir a vide - Google Patents

Procede de commande pour empecher une bouilloire de bouillir a vide Download PDF

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Publication number
WO2007028281A1
WO2007028281A1 PCT/CN2005/001454 CN2005001454W WO2007028281A1 WO 2007028281 A1 WO2007028281 A1 WO 2007028281A1 CN 2005001454 W CN2005001454 W CN 2005001454W WO 2007028281 A1 WO2007028281 A1 WO 2007028281A1
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Prior art keywords
temperature
change rate
microprocessor
control circuit
electric kettle
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Application number
PCT/CN2005/001454
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English (en)
French (fr)
Inventor
George Zhang
Yaolun Wang
Original Assignee
Crastal Technology (Shenzhen) Co., Ltd
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Application filed by Crastal Technology (Shenzhen) Co., Ltd filed Critical Crastal Technology (Shenzhen) Co., Ltd
Priority to AT05783985T priority Critical patent/ATE450177T1/de
Priority to EP05783985A priority patent/EP1922961B1/en
Priority to US11/632,089 priority patent/US7786410B2/en
Priority to DE602005018117T priority patent/DE602005018117D1/de
Priority to PCT/CN2005/001454 priority patent/WO2007028281A1/zh
Publication of WO2007028281A1 publication Critical patent/WO2007028281A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/21—Water-boiling vessels, e.g. kettles
    • A47J27/21008—Water-boiling vessels, e.g. kettles electrically heated
    • A47J27/21058—Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water
    • A47J27/21091—Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water of electronic type

Definitions

  • the invention relates to a control method of an electric kettle, in particular to a control method for preventing dry burning of an electric kettle.
  • the electric kettle brings convenience to people's life and work.
  • the prior art electric kettle prevents the dry burning from being generally protected by a fuse.
  • the heating body temperature The rise of the fuse blows the fuse of the fuse, thereby cutting off the heating power source and protecting it.
  • the insufficiency of the protection method of the electric kettle against dry burning is: determining that the temperature rise is inaccurate, thereby causing the control circuit to cut off the heating power supply in time, which is liable to cause damage to other electrical components; and another conventional method using bimetal prevention Dry-burning switch, when accidentally dry burning, too high temperature will make the dry-burning switch work, cut off the heating power supply.
  • the shortcoming of this method is also that the power supply is not turned off in time.
  • An object of the present invention is to provide a method for controlling an electric kettle against thousands of fires, and the technical problem to be solved is to accurately judge the temperature rise in the electric kettle and turn off the heating power source.
  • a control method for preventing dry burning of an electric kettle includes the following steps: 1. setting a sensor, a microprocessor and a control circuit in the electric kettle; 2. detecting the temperature of the electric kettle in real time; The microprocessor calculates a temperature change rate according to the detected temperature, and compares the temperature change rate with a preset value;
  • the microprocessor calculates a temperature acceleration change rate at which the temperature changes over time, and when it is greater than a predetermined value, signals the control circuit.
  • the microprocessor When the temperature acceleration change rate of the present invention is less than a preset value, the microprocessor returns to extract the temperature change rate from the current previous cycle and compares it with the preset value again.
  • the longest heating time is set in the microprocessor of the present invention, and when the continuous heating time is greater than the maximum heating time, a signal is sent to the control circuit.
  • the maximum heating temperature is set in the microprocessor of the present invention, and when the heating temperature is greater than the maximum heating temperature, a signal is sent to the control circuit.
  • control circuit of the present invention When the control circuit of the present invention receives the signal from the microprocessor, the heating power source is turned off.
  • the microprocessor of the present invention stores the temperature change rate and the temperature acceleration change rate for each continuous heating.
  • the control circuit of the present invention turns on the heating power source, the sensor starts to detect the temperature in the electric water heater in real time, and the microprocessor starts to calculate the temperature change rate and the temperature acceleration change rate, and starts to compare with the preset value.
  • the microprocessor clears the stored temperature change rate and the temperature acceleration rate of change.
  • the present invention uses a microprocessor to calculate a temperature change rate and a temperature acceleration change rate, and compares the temperature change rate and the temperature acceleration change rate with a preset value, when the temperature change rate and the temperature acceleration change rate When it is greater than the preset value, it sends out to the control circuit
  • the signal causes the control circuit to cut off the heating power supply, which can accurately judge the temperature rise of the electric kettle, realize the timely power-off control, and avoid the damage of the electric kettle.
  • Fig. 1 is a flow chart showing an embodiment of a method for controlling dry burning of an electric kettle according to the present invention.
  • the control method for the anti-dry burning of the electric kettle of the present invention comprises the following steps: 1. setting a temperature sensor, a microprocessor and a control circuit in the electric kettle; 2. when the control circuit is connected to the heating power source, the sensor starts to detect the electric kettle in real time. Temperature; third, the microprocessor calculates the temperature change rate according to the detected temperature, and compares the temperature change rate with a preset value; 4. When the temperature change rate is greater than a preset value, sends a signal to the control circuit, cutting off Heating the power supply and sending an alarm; when the temperature change rate is less than the preset value, the microprocessor calculates the temperature acceleration rate of change with time; 5.
  • the microprocessor extracts the temperature change rate value from the current 1 second, returns to the main program, performs other working procedures and prepares for the next time period. Anti-dry burning.
  • the longest heating time is set in the microprocessor.
  • a signal is sent to the control circuit to cut off the heating power and an alarm sounds;
  • the maximum heating temperature is also set in the microprocessor when heating When the temperature is greater than the maximum heating temperature, a signal is sent to the control circuit to cut off the heating power and send an alarm.
  • the microprocessor stores the temperature change rate and the temperature acceleration change rate of each continuous heating; As shown in Figure 1, the control circuit turns on the heating power. When the continuous heating time is greater than or equal to the preset maximum heating time, the heating power is turned off and an alarm sounds; if the continuous heating time is less than the preset longest heating Time, the temperature sensor detects the heating temperature. When the heating temperature is greater than the preset maximum heating temperature, the heating power is turned off and an alarm sounds; if the heating temperature is lower than the preset maximum heating temperature, the microprocessor calculates the temperature change rate and changes the temperature. The rate is compared with the preset value.
  • the microprocessor calculates the temperature change rate with time.
  • the heating power is turned off and an alarm sounds.
  • the microprocessor extracts the current temperature change rate.
  • the preset values are compared for use in the next cycle to calculate the temperature acceleration rate.
  • the preset maximum heating time, the maximum heating temperature, the temperature change rate value and the temperature acceleration rate value of the electric kettle of different volumes and different heating powers can be obtained experimentally, and stored in the microprocessor as a constant.
  • the analog-to-digital conversion port of the microprocessor is connected to the resistors with different partial pressure values. Different partial pressure values have different analog-to-digital conversion results for different volume and different heating power electric kettles, and different conversion results are utilized.
  • the query code As the query code, the required calculation period, the preset temperature change rate value and the temperature acceleration change rate value, and the preset maximum heating time can be obtained.
  • the chip for the same software can be applied to different types and different powers of electric heating. kettle.
  • Example 1 the volume was 1.75 liters, the heating power was 2000 W, the calculation period was 6 seconds, the preset temperature change rate was 8 degrees/second, and the temperature acceleration rate was 2 degrees/second.
  • Example 2 the volume is 1.75 liters, the heating power is 3000 W, and the calculation period is 2 seconds. Let the temperature change rate be 8 and the temperature acceleration change rate be 2.
  • Example 3 volume 1.75 liters, heating power 1000 W, calculation period of 10 seconds, preset temperature change rate 8, temperature acceleration rate of change 2.

Description

电热水壶防千烧的控制方法 技术领域
本发明涉及一种电热水壶的控制方法， 特别是一种电热水壶防干 烧的控制方法。
背景技术
电热水壶给人们的生活和工作带了方便， 现有技术的电热水壶防 止干烧一般采用熔断器保护的方法， 当使用者不小心没有在电热水壶 内加水而接通加热电源时，加热体温度的升高使熔断器的熔断丝熔断， 从而切断加热电源， 起到保护的作用。 这种电热水壶防干烧的保护方 法的不足是： 判断温升不准确， 从而导致控制电路切断加热电源不及 时， 容易造成其他电器元件的损坏； 另有一种传统的方法采用双金属 片的防干烧开关， 发生不小心干烧时， 过高的温度会使干烧开关起作 用， 切断加热电源， 此种方法的不足之处也是切断电源不及时。
发明内容
本发明的目的是提供一种电热水壶防千烧的控制方法， 要解决的 技术问题是准确判断电热水壶里的温升， 关断加热电源。
本发明采用以下技术方案： 一种电热水壶防干烧的控制方法， 包 括以下步骤. · 一、 在电热水壶里设置传感器、 微处理器和控制电路； 二、 传感器实时检测电热水壶的温度； 三、 微处理器根据检测到的温 度计算温度变化率， 并将温度变化率与预先设定值进行比较； 四、 当
1
确 认 本 温度变化率大于预先设定值时， 向控制电路发出信号。
本发明的温度变化率小于预先设定值时， 微处理器计算温度随时 间变化的温度加速变化率， 其大于预先设定值时， 向控制电路发出信 号。
本发明的温度加速变化率小于预先设定值时， 微处理器返回提取 距当前前一周期的温度变化率， 重新与预先设定值进行比较。
本发明的微处理器内设置最长加热时间， 当连续加热时间大于最 长加热时间时， 向控制电路发出信号。 '
本发明的微处理器内设置最高加热温度， 当加热温度大于最高加 热温度时， 向控制电路发出信号。
本发明的控制电路接收到微处理器的信号时， 切断加热电源。 本发明的微处理器将每次连续加热的温度变化率和温度加速变化 率进行存储。
本发明的控制电路接通加热电源时， 传感器开始实时检测电热水 壶里的温度， 微处理器开始计算温度变化率和温度加速变化率， 并开 始与预先设定值进行比较。
本发明的控制电路切断加热电源时， 发出连续报警讯响。
本发明的控制电路切断加热电源后， 微处理器清除所储存的温度 变化率和温度加速变化率。
本发明与现有技术相比， 采用微处理器计算温度变化率与温度加 速变化率，并将温度变化率和温度加速变化率与预先设定值进行比较， 当温度变化率和温度加速变化率大于预先设定值时， 向控制电路发出 信号使控制电路切断加热电源， 能准确判断电热水壶的温升， 实现及 时断电的控制， 避免了电热水壶的损坏。
附图说明
图 1是本发明电热水壶防干烧的控制方法实施例的流程图。
具体实施方式
下面结合附图和实施例对本发明作进一步详细说明。 本发明的电 热水壶防干烧的控制方法， 包括以下步骤： 一、 在电热水壶里设置温 度传感器、 微处理器和控制电路； 二、 控制电路接通加热电源时， 传 感器开始实时检测电热水壶的温度； 三、 微处理器根据检测到的温度 计算温度变化率， 并将温度变化率与预先设定值进行比较； 四、 当温 度变化率大于预先设定值时， 向控制电路发出信号， 切断加热电源并 发出报警讯响； 温度变化率小于预先设定值时， 微处理器计算温度随 时间变化的温度加速变化率； 五、温度加速变化率大于预先设定值时， 向控制电路发出信号， 切断加热电源并发出报警讯响； 温度加速变化 率小于预先设定值时，微处理器提取距当前 1秒钟前的温度变化率值， 返回主程序， 进行其他工作程序并准备下一时段的防干烧。
同时， 微处理器内设置最长加热时间， 当连续加热时间大于最长 加热时间时， 向控制电路发出信号， 切断加热电源并发出报警讯响； 微处理器内还设置最高加热温度， 当加热温度大于最高加热温度时， 向控制电路发出信号， 切断加热电源并发出报警讯响。
微处理器将每次连续加热的温度变化率和温度加速变化率进行存 储； 如图 1所示， 控制电.路接通加热电源， 当连续加热时间大于或等 于预设最长加热时间时， 则切断加热电源并发出报警讯响； 若连续加 热时间小于预设最长加热时间， 温度传感器检测加热温度， 加热温度 大于预设最高加热温度时， 则切断加热电源并发出报警讯响； 若加热 温度小于预设最高加热温度， 微处理器计算温度变化率， 并将温度变 化率与预先设定值进行比较， 当温度变化率大于预先设定值时， 则切 断加热电源并发出报警讯响； 温度变化率小于预先设定值时， 微处理 器计算温度变化率随时间变化的温度加速变化率， 温度加速变化率大 于预先设定值时， 则切断加热电源并发出报警讯响； 温度加速变化率 小于预先设定值时， 微处理器提取当前的温度变化率， 重新与预先设 定值进行比较供下一周期计算温度加速变化率使用。 可用实验的方法 获得不同容积， 不同加热功率的电热水壶的预设最长加热时间、 最高 加热温度、 温度变化率值和温度加速变化率值， 并以常数存储在微处 理器中。
微处理器的模数转换口连接不同分压值的电阻， 不同的分压值对 于不同容积、 不同加热功率的电热水壶， 不同分压值有不同的模数转 换结果， 利用这不同的转换结果作为査询代码就可获得所需的计算周 期、 预设温度变化率值和温度加速变化率值、 预设最长加热时间， 这 样， 对于同一软件的芯片可适用于不同型号、 不同功率的电热水壶。
实施例 1， 容积 1. 75升、 加热功率 2000W, 计算周期为 6秒， 预 设温度变化率为 8度 /秒， 温度加速变化率为 2度 /秒。
实施例 2， 容积 1. 75升、 加热功率 3000W， 计算周期为 2秒， 预 设温度变化率为 8， 温度加速变化率为 2。
实施例 3， 容积 1. 75升、加热功率 1000W， 计算周期为 10秒， 预 设温度变化率为 8， 温度加速变化率为 2。

Claims

1. 一种电热水壶防干烧的控制方法， 包括以下步骤： 一、在电热水壶 里设置传感器、 微处理器和控制电路； 二、 传感器实时检测电热水 壶的温度； 三、 微处理器根据检测到的温度计算温度变化率， 并将 权
温度变化率与预先设定值迸行比较； 四、 当温度变化率大于预先设 定值时， 向控制电路发出信号。
2. 根据权利要求 1所述的电热水壶防干烧的控制方法， 其特征在于： 所述温度变化率小于预先设定值时，微处理器计算温度随时间变化 的温度加速变化率， 其大于预先设定值时，求向控制电路发出信号。
3. 根据权利要求 2所述的电热水壶防千烧的控制方法， 其特征在于： 所述温度加速变化率小于预先设定值时，微处理器返回提取距当前 前一周期的温度变化率， 重新与预先设定值进行比较。
4. 根据权利要求 3所述的电热水壶防千烧的控制方法， 其特征在于： 所述微处理器内设置最长加热时间，当连续加热时间大于最长加热 时间时， 向控制电路发出信号。
5. 根据权利要求 4所述的电热水壶防千烧的控制方法， 其特征在于： 所述微处理器内设置最高加热温度，当加热温度大于最高加热温度 时， 向控制电路发出信号。
6. 根据权利要求 1至 5中任一所述的电热水壶防干烧的控制方法，其 特征在于：所述控制电路接收到微处理器的信号时，切断加热电源。
7. 根据权利要求 6所述的电热水壶防干烧的控制方法， 其特征在于： 所述微处理器将每次连续加热的温度变化率和温度加速变化率进 行存储。
8. 根据权利要求 7所述的电热水壶防干烧的控制方法， 其特征在于： 所述控制电路接通加热电源时，传感器开始实时检测电热水壶里的 温度，微处理器开始计算温度变化率和温度加速变化率， 并开始与 预先设定值进行比较。
9. 根据权利要求 8所述的电热水壶防干烧的控制方法， 其特征在于： 所述控制电路切断加热电源时， 发出连续报警讯响。
10.根据权利要求 9所述的电热水壶防干烧的控制方法， 其特征在于： 所述控制电路切断加热电源后，微处理器清除所储存的温度变化率 和温度加速变化率。
Figure imgf000010_0001
图 1
PCT/CN2005/001454 2005-09-10 2005-09-10 Procede de commande pour empecher une bouilloire de bouillir a vide WO2007028281A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT05783985T ATE450177T1 (de) 2005-09-10 2005-09-10 Steuerverfahren zur verhinderung des leerkochens eines elektrischen wasserkochers
EP05783985A EP1922961B1 (en) 2005-09-10 2005-09-10 A control method for preventing electrical water boiler from empty boiling
US11/632,089 US7786410B2 (en) 2005-09-10 2005-09-10 Method of controlling electric kettle for “dry” burn prevention
DE602005018117T DE602005018117D1 (de) 2005-09-10 2005-09-10 Steuerverfahren zur verhinderung des leerkochens eines elektrischen wasserkochers
PCT/CN2005/001454 WO2007028281A1 (fr) 2005-09-10 2005-09-10 Procede de commande pour empecher une bouilloire de bouillir a vide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2005/001454 WO2007028281A1 (fr) 2005-09-10 2005-09-10 Procede de commande pour empecher une bouilloire de bouillir a vide

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WO2007028281A1 true WO2007028281A1 (fr) 2007-03-15

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US (1) US7786410B2 (zh)
EP (1) EP1922961B1 (zh)
AT (1) ATE450177T1 (zh)
DE (1) DE602005018117D1 (zh)
WO (1) WO2007028281A1 (zh)

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