CN111928969B - Pot temperature detection device, electromagnetic heating device and pot temperature detection method - Google Patents
Pot temperature detection device, electromagnetic heating device and pot temperature detection method Download PDFInfo
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- CN111928969B CN111928969B CN201910395468.8A CN201910395468A CN111928969B CN 111928969 B CN111928969 B CN 111928969B CN 201910395468 A CN201910395468 A CN 201910395468A CN 111928969 B CN111928969 B CN 111928969B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/36—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using magnetic elements, e.g. magnets, coils
- G01K7/38—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using magnetic elements, e.g. magnets, coils the variations of temperature influencing the magnetic permeability
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2207/00—Application of thermometers in household appliances
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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Abstract
The invention relates to a pot temperature detection device, an electromagnetic heating device and a pot temperature detection method, comprising the following steps: the heating circuit is a heating coil used for generating heat to heat the pot; the sampling circuit is used for monitoring the real-time inductance value of the heating coil in the heating process of the heating circuit and acquiring a corresponding sampling signal; the signal processing unit is used for receiving the sampling signal to obtain the real-time temperature of the cooker; the first storage unit is used for storing a preset temperature; the comparison unit is used for comparing the real-time temperature of the cooker with the preset temperature and outputting a comparison result; a signal output unit for receiving the comparison result to generate a corresponding power adjustment signal; and the power driving circuit is used for receiving and adjusting the input power of the heating circuit according to the power adjusting signal in the heating process of the heating circuit so as to adjust the temperature of the cooker. The invention has simple temperature detection process and high precision.
Description
Technical Field
The invention relates to the technical field of electromagnetic heating, in particular to a cooker temperature detection device, an electromagnetic heating device and a cooker temperature detection method.
Background
Temperature control in electromagnetic heating processes has become increasingly critical. Especially with the development of intelligence, more intelligent temperature control processes are also desired during the use of electromagnetic heating. Generally, the traditional temperature sensor feeds back the temperature of the cooker to prevent dry burning. When the commonly used NTC, thermocouple and the like are used for detecting the temperature of the cookware, point detection is adopted, and the detection on the heating area of the whole cookware cannot be carried out. The general thermal imaging equipment has high cost, is easily influenced by the surface reflectivity and is inaccurate, and the equipment is extremely troublesome to install. The high temperature zone located in the induction heating is the area with the worst electromagnetic condition, and the dry burning state is difficult to accurately detect.
Disclosure of Invention
The present invention provides a pot temperature detection device, an electromagnetic heating device, and a pot temperature detection method, aiming at the above-mentioned technical defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: construct a pot temperature-detecting device, include:
the heating circuit comprises a heating coil for generating heat to heat the cooker;
the sampling circuit is connected with the heating coil and used for monitoring the real-time inductance value of the heating coil in the heating process of the heating circuit and acquiring a corresponding sampling signal;
the signal processing unit is connected with the sampling circuit and used for receiving the sampling signal to acquire real-time temperature of the cookware;
the first storage unit is used for storing a preset temperature;
the comparison unit is connected with the signal processing unit and the first storage unit and is used for comparing the real-time temperature of the cooker with the preset temperature and outputting a comparison result;
the signal output unit is connected with the comparison unit and used for receiving the comparison result to generate a corresponding power adjustment signal;
and the power driving circuit is connected with the signal output unit and the heating circuit and is used for receiving and adjusting the input power of the heating circuit according to the power adjusting signal in the heating process of the heating circuit so as to adjust the temperature of the cookware.
Preferably, the pot temperature detecting device of the present invention further comprises:
the second storage unit is used for storing corresponding relation data of the temperature of the cookware and the inductance value of the heating coil;
the signal processing unit is connected with the second storage unit and used for acquiring the real-time temperature of the cookware according to the corresponding relation data; or
A third storage unit for storing characteristic parameters of the heating coil;
the first calculating unit is connected with the signal processing unit and the third storage unit and is used for calculating the real-time magnetic conductivity of the cookware according to the real-time inductance value of the heating coil;
the fifth storage unit is used for storing the temperature coefficient of the cookware, the initial temperature of the cookware and the initial magnetic conductivity corresponding to the initial temperature;
and the second calculating unit is connected with the fifth storage unit and the first calculating unit and is used for calculating the real-time temperature of the cookware.
Preferably, the sampling circuit comprises a voltage detection module and a current detection module, and the signal processing unit comprises a first signal processing unit;
the voltage detection module is connected with the heating coil and used for detecting the real-time voltage of the heating coil and generating a corresponding voltage sampling signal;
the current detection module is connected with the heating coil and used for detecting the real-time current of the heating coil and generating a corresponding current sampling signal;
the first signal processing unit receives the voltage sampling signal and the current sampling signal to acquire a real-time inductance value of the heating coil.
Preferably, the heating circuit further comprises a resonance capacitor connected in parallel with the heating coil, and the heating coil and the resonance capacitor form a resonance circuit;
the sampling circuit comprises a frequency detection module, and the frequency detection module is connected with the resonant circuit and used for detecting the real-time working frequency of the resonant circuit and generating a corresponding frequency sampling signal when the heating coil works
The signal processing unit comprises a second signal processing unit, and the second signal processing circuit is used for storing the capacitance value of the resonance capacitor and receiving the frequency sampling signal to calculate the real-time inductance value of the heating coil according to the capacitance value.
Preferably, the sampling circuit further comprises a temperature detection module,
the temperature detection module is used for detecting the ambient temperature and generating a corresponding temperature sampling signal;
the signal processing unit further comprises a third signal processing unit, and the third signal processing unit is used for storing the nominal value of the resonance capacitor and the capacitance value temperature characteristic curve of the resonance capacitor, receiving the temperature sampling signal to calculate the working capacitance value of the resonance capacitor, and calculating the real-time inductance value of the heating coil according to the working capacitance value.
The invention also provides an electromagnetic heating device which comprises the pot temperature detection device.
The invention also provides a pot temperature detection method, which is applied to the electromagnetic heating device and comprises the following steps:
a1, monitoring the real-time inductance value of the heating coil in the heating process of the heating circuit, acquiring a corresponding sampling signal and sending the sampling signal to the central processing unit;
a2, the central processing unit receives and processes the sampling signal to obtain the real-time inductance value, and obtains the real-time temperature of the corresponding pot according to the real-time inductance value;
a3, the central processing unit compares the real-time temperature of the cooker with a preset temperature to generate a corresponding power adjustment signal according to the comparison result;
a4, the power driving circuit receives and adjusts the input power of the heating circuit according to the power adjusting signal to adjust the temperature of the cooker.
Preferably, the pot temperature detection method of the present invention further comprises: in the production process of the electromagnetic heating device, the following steps are carried out:
b1, obtaining the corresponding initial magnetic permeability of the cookware at an initial temperature through pretesting;
b2, adjusting the temperature of the pot to be a plurality of temperatures, and calculating a plurality of magnetic conductivities corresponding to the temperatures according to the initial temperatures and the initial magnetic conductivities corresponding to the initial temperatures;
b3, respectively calculating a plurality of inductance values of the heating coil in the heating process of the heating circuit according to the plurality of magnetic permeability;
b4, recording the temperatures and the inductance values of the heating coil to generate corresponding relation data of the pot temperature and the inductance value of the heating coil;
in the step a2, the obtaining the corresponding real-time temperature of the pot according to the real-time inductance value includes:
the central processing unit acquires real-time temperature of the cookware corresponding to the real-time inductance value according to the corresponding relation data; or
In the step a2, the obtaining the real-time temperature of the corresponding pot according to the real-time inductance value includes:
a21, the central processing unit acquires the characteristic parameters of the heating coil to calculate the real-time magnetic permeability of the cookware corresponding to the real-time inductance value according to the real-time inductance value of the heating coil;
a22, the central processing unit obtains the temperature coefficient of the pot, the initial temperature of the pot and the corresponding initial permeability, and the real-time permeability of the pot to calculate the real-time temperature of the pot.
Preferably, the first and second electrodes are formed of a metal,
in step B2, the calculation formula for calculating the plurality of magnetic permeabilities corresponding to the plurality of temperatures includes:
μs＝αμμ1*(Ts-T1)+μ1
wherein, musPermeability of pot tool, TsTemperature of the pot, T1Is the initial temperature of the pot, mu1For a pot at a temperature of T1Initial permeability of time, alphaμIs the temperature coefficient of the cooker;
in step B3, the calculation formula for calculating the inductance values of the heating coil in the heating process of the corresponding heating circuit from the magnetic permeabilities includes:
wherein L is the real-time inductance value of the heating coil, μsIs the real-time magnetic conductivity of the pan, K is a constant, mu0The method comprises the following steps of (1) setting the vacuum magnetic conductivity of a cooker, wherein N is the number of turns of a heating coil, S is the cross section area of the heating coil, and l is the length of the heating coil;
or
In the step a21, the calculation formula for calculating the real-time permeability of the pot corresponding to the real-time inductance value according to the real-time inductance value of the heating coil includes:
wherein, musIs the real-time magnetic conductivity of the pan, K is a constant, mu0The method comprises the following steps of (1) setting the vacuum magnetic conductivity of a cooker, wherein N is the number of turns of a heating coil, S is the cross section area of the heating coil, L is the real-time inductance value of the heating coil, and L is the length of the heating coil;
in the step a22, the calculation formula for calculating the real-time temperature of the pot includes:
wherein, TsIs the temperature of the pot, musFor permeability of pots, T1Is the initial temperature of the pot, mu1For a pot at a temperature of T1Initial permeability of time, alphaμIs the temperature coefficient of the cooker.
Preferably, the first and second electrodes are formed of a metal,
in the step a1, the monitoring real-time inductance value of the heating coil during heating of the heating circuit and acquiring corresponding sampling signals includes:
detecting real-time voltage of the heating coil and generating a corresponding voltage sampling signal;
detecting real-time current of the heating coil and generating a corresponding current sampling signal;
in the step a2, the receiving and processing the sampled signal by the central processing unit to obtain a real-time inductance value includes:
the central processing unit receives the current sampling signal to obtain the current change rate of the heating coil and obtains the current change rate according to a formula UL＝LsCalculating a real-time inductance value of the heating coil;
wherein L issReal-time inductance value, U, for heating coilsLAnd di (t)/dt is the current change rate of the heating coil and is the voltage value corresponding to the voltage sampling signal.
Preferably, in the step a1, the monitoring real-time inductance value of the heating coil during heating of the heating circuit and acquiring corresponding sampling signals includes:
a11, detecting the real-time working frequency of the corresponding resonance circuit and generating a corresponding frequency sampling signal when the heating coil works;
a12, the central processing unit obtains the capacitance value of the resonance capacitor of the resonance circuit and receives the frequency sampling signal to calculate the real-time inductance value of the heating coil.
Preferably, the step a12 includes:
a121, the central processing unit acquires a nominal value of the resonance capacitor and a capacitance value temperature characteristic curve of the resonance capacitor;
a122, detecting the ambient temperature and generating a corresponding temperature sampling signal;
a123, the central processing unit receives the temperature sampling signal and calculates a working capacitance value of the resonance capacitor according to a nominal value of the resonance capacitor and a capacitance value temperature characteristic curve of the resonance capacitor;
and A124, the central processing unit calculates a real-time inductance value of the heating coil according to the working capacitance value.
The cooker temperature detection device, the electromagnetic heating device and the cooker temperature detection method have the following beneficial effects that: the temperature detection process is simple and the precision is high.
Drawings
The invention will be further described with reference to the following drawings and examples, in which:
FIG. 1 is a schematic structural view of a pot temperature detecting device according to a first embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a second embodiment of the pot temperature detecting device according to the present invention;
FIG. 3 is a schematic circuit diagram of a third embodiment of the pot temperature detecting device of the present invention;
FIG. 4 is a flowchart of the process of the first embodiment of the pot temperature detecting method of the present invention;
FIG. 5 is a flowchart of the process of the pot temperature detecting method according to the second embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in a first embodiment of the pot temperature detecting device of the present invention, the pot temperature detecting device includes: the heating circuit 10, the heating circuit 10 includes the heating coil used for producing heat to heat the pan; the sampling circuit 20 is connected with the heating coil, and is used for monitoring the real-time inductance value of the heating coil in the heating process of the heating circuit 10 and acquiring a corresponding sampling signal; the signal processing unit is connected with the sampling circuit 20 and is used for receiving the sampling signal to obtain the real-time temperature of the cookware; the first storage unit is used for storing a preset temperature; the comparison unit is connected with the signal processing unit and the first storage unit and is used for comparing the real-time temperature of the cookware with a preset temperature and outputting a comparison result; the signal output unit is connected with the comparison unit and used for receiving the comparison result to generate a corresponding power adjustment signal; and the power driving circuit 40 is connected with the signal output unit and the heating circuit 10, and is used for receiving and adjusting the input power of the heating circuit 10 according to the power adjusting signal in the heating process of the heating circuit 10 so as to adjust the temperature of the pot. Specifically, in this embodiment, the signal processing power supply, the first storage unit, the comparison unit, and the signal output unit may be integrated in the main control circuit 30. In actual use, the change of the temperature of the cookware can cause the change of the magnetic permeability of the material, thereby changing the change of the inductance value. In the process that the power input circuit 50 inputs power and the heating circuit 10 heats the pot, the sampling circuit 20 monitors the real-time inductance value of the heating coil in the heating process and generates a sampling signal corresponding to the real-time inductance value. The main control circuit 30 processes the sampling signal through the signal processing unit to obtain the real-time temperature of the corresponding pot through the sampling signal, meanwhile, the first storage unit of the main control circuit 30 stores the preset temperature, the comparison unit in the main control circuit 30 obtains the real-time temperature of the pot and the preset temperature and compares the real-time temperature with the preset temperature, and outputs the corresponding comparison result, the signal output unit in the main control circuit 30 outputs the corresponding power adjustment signal according to the comparison result, and the driving power driving circuit 40 adjusts the output power of the heating circuit 10 to adjust the temperature of the pot as required. It can be understood that the real-time temperature of the cookware can be the maximum temperature of the cookware for the preset temperature by comparing the real-time temperature of the cookware with the preset temperature, and when the real-time temperature of the cookware exceeds the preset temperature, the power adjustment is carried out, so that the temperature of the cookware is reduced. When the real-time temperature of the cooker is lower than the preset temperature, namely the real-time temperature of the cooker does not exceed the limit value, the power adjusting signal is used for maintaining the current power to continue heating. It can also be understood that presetting the temperature can be the target temperature, when detecting that the real-time temperature of pan is less than this temperature of presetting, increase input power's setting to heating circuit 10 through the power adjustment signal to increase the pan temperature, in order to reach the temperature of presetting, or when detecting that the real-time temperature of pan is higher than this temperature of presetting, reduce input power's setting to heating circuit 10 through the power adjustment signal, in order to reduce this pan temperature.
Optionally, in an embodiment, the pot temperature detecting device of the present invention further includes: the second storage unit is used for storing corresponding relation data of the temperature of the cookware and the inductance value of the heating coil; the signal processing unit is connected with the second storage unit and used for acquiring real-time temperature of the cookware according to the corresponding relation data; specifically, the main control circuit 30 may further include a second storage unit, the second storage unit stores data of correspondence between the pot temperature and the inductance value of the heating coil, and after the sampling circuit 20 acquires the sampling signal corresponding to the real-time inductance value of the heating coil, the signal processing unit of the main control circuit 30 acquires the real-time inductance value of the heating coil according to the sampling signal, and acquires the corresponding real-time pot temperature according to the data of correspondence between the pot temperature and the inductance value of the heating coil.
In another embodiment, the pot temperature detecting device of the present invention further comprises: a third storage unit for storing characteristic parameters of the heating coil; the first calculating unit is connected with the signal processing unit and the third storage unit and used for calculating the real-time magnetic conductivity of the cookware according to the real-time inductance value of the heating coil; the fifth storage unit is used for storing the temperature coefficient of the cookware, the initial temperature of the cookware and the initial magnetic conductivity corresponding to the initial temperature; and the second calculating unit is connected with the fifth storage unit and the first calculating unit and is used for calculating the real-time temperature of the cookware. Specifically, the main control circuit 30 may include a third storage unit that stores a characteristic parameter of the heating coil, which may be understood as a known parameter after the heating coil is manufactured, that is, a known constant, and the main control circuit 30 may further include a first calculation unit that calculates the real-time magnetic permeability of the pot according to the characteristic parameter of the heating coil and a real-time inductance value of the heating coil obtained by the signal processing unit according to the sampling signal of the sampling circuit 20. The main control circuit 30 further includes a fifth storage unit for storing the temperature coefficient of the pot, the initial temperature of the pot and the corresponding initial permeability, and calculating the real-time temperature of the pot according to the above parameters through the second calculation unit of the main control circuit 30. It will be appreciated that once a pot is selected, the temperature coefficient of the pot, the initial temperature of the pot and its corresponding initial permeability may also be understood as known parameters.
Preferably, in the embodiment shown in fig. 2, the sampling circuit 20 includes a voltage detection module 21 and a current detection module 22, and the signal processing unit includes a first signal processing unit; the voltage detection module 21 is connected with the heating coil and used for detecting the real-time voltage of the heating coil and generating a corresponding voltage sampling signal; the current detection module 22 is connected with the heating coil and used for detecting the real-time current of the heating coil and generating a corresponding current sampling signal; the first signal processing unit receives the voltage sampling signal and the current sampling signal to acquire a real-time inductance value of the heating coil. Specifically, the voltage detection module 21 detects a real-time voltage of the heating coil and generates a corresponding voltage sampling signal, the current detection module 22 detects a real-time current of the heating coil and generates a corresponding current sampling signal, and the first signal processing unit in the main control circuit 30 calculates a real-time inductance value of the heating coil according to the voltage sampling signal and the current sampling signal.
Optionally, as shown in the embodiment shown in fig. 3, the heating circuit 10 further includes a resonant capacitor connected in parallel with the heating coil, and the heating coil and the resonant capacitor form a resonant circuit; the sampling circuit 20 comprises a frequency detection module 23, and the frequency detection module 23 is connected with the resonant circuit and is used for detecting the real-time working frequency of the resonant circuit when the heating coil works and generating a corresponding frequency sampling signal; the signal processing unit includes a second signal processing unit for storing a capacitance value of the resonance capacitor and receiving the frequency sampling signal to calculate a real-time inductance value of the heating coil according to the capacitance value. Specifically, a resonant circuit is formed in the heating coil by a resonant capacitor connected in parallel thereto, and the heating coil generates heat by the operation of the resonant circuit. The frequency detection module 23 collects a real-time working frequency of the resonant circuit during working, and generates a corresponding frequency sampling signal, and the second signal processing unit in the main control circuit 30 stores a capacitance value of the resonant capacitor, where it can be understood that once the resonant circuit is selected, the resonant capacitor is also fixed, a parameter of the corresponding resonant capacitor is also a specific parameter, and the specific parameter may be a capacitance value of the resonant capacitor. The second signal processing unit calculates a real-time inductance value of the heating coil according to the parameter of the resonance capacitor and the frequency parameter of the frequency sampling signal.
Further, the sampling circuit 20 further includes a temperature detection module 24, where the temperature detection module 24 is configured to detect an ambient temperature and generate a corresponding temperature sampling signal; the signal processing unit further comprises a third signal processing unit, and the third signal processing unit is used for storing the nominal value of the resonant capacitor and the capacitance value temperature characteristic curve of the resonant capacitor, receiving the temperature sampling signal to calculate the working capacitance value of the resonant capacitor, and calculating the real-time inductance value of the heating coil according to the working capacitance value. Specifically, on the basis of the above, the temperature detecting module 24 is configured to detect an ambient temperature and generate a corresponding temperature sampling signal, and as can be seen from the above, once the resonant circuit is determined, the parameter of the resonant capacitor is also a specific parameter, where the specific parameter may include a nominal value of the resonant capacitor and a capacitance temperature characteristic curve, and the third signal processing unit stores the nominal value of the resonant capacitor and the capacitance temperature characteristic curve and calculates a working capacitance value of the resonant capacitor corresponding to the environment according to the temperature sampling signal, so that a real-time inductance value of the heating coil may be calculated according to the working capacitance value, so as to ensure accuracy of the real-time inductance value of the heating coil.
In addition, the electromagnetic heating device of the present invention includes the pot temperature detecting device described in any one of the above. It is understood that the electromagnetic heating device may include an electromagnetic oven, a rice cooker, and the like, which use electromagnetism to heat.
In addition, as shown in the embodiment shown in fig. 4, the pot temperature detecting method of the present invention, which is applied to the electromagnetic heating device, includes the following steps:
a1, monitoring the real-time inductance value of the heating coil in the heating process of the heating circuit 10, acquiring a corresponding sampling signal and sending the sampling signal to the central processing unit; specifically, in the process of heating the pot by the heating circuit 10, the sampling circuit 20 monitors the real-time inductance value of the heating coil in the heating process, and generates a sampling signal corresponding to the real-time inductance value. The sampled signal is sent to a central processing unit for corresponding processing.
A2, the central processing unit receives and processes the sampling signal to obtain a real-time inductance value, and obtains the corresponding real-time temperature of the cookware according to the real-time inductance value; the central processing unit processes the sampling signal so as to obtain the real-time temperature of the corresponding pot through the sampling signal. It can be understood that the real-time temperature of the pot corresponds to the real-time inductance value of the heating coil.
A3, comparing the real-time temperature of the pot with a preset temperature by the central processing unit to generate a corresponding power adjusting signal according to the comparison result; specifically, the central processing unit obtains the real-time temperature of the cookware and the preset temperature, compares the real-time temperature with the preset temperature, outputs a corresponding comparison result, and outputs a corresponding power adjustment signal according to the comparison result.
A4, the power driving circuit 40 receives and adjusts the input power of the heating circuit 10 according to the power adjusting signal to adjust the pot temperature. The driving power driving circuit 40 adjusts the output power of the heating circuit 10 according to the received power adjusting signal to adjust the pot temperature as required. It can be understood that the real-time temperature of the cooker and the preset temperature are compared to be the maximum temperature of the cooker, and when the real-time temperature of the cooker exceeds the preset temperature, power adjustment is carried out, and the temperature of the cooker is reduced. When the real-time temperature of the cooker is lower than the preset temperature, namely the real-time temperature of the cooker does not exceed the limit value, the power adjusting signal is used for maintaining the current power to continue heating. It can also be understood that presetting the temperature can be the target temperature, when detecting that the real-time temperature of pan is less than this temperature of presetting, increase input power's setting to heating circuit 10 through the power adjustment signal to increase the pan temperature, in order to reach the temperature of presetting, or when detecting that the real-time temperature of pan is higher than this temperature of presetting, reduce input power's setting to heating circuit 10 through the power adjustment signal, in order to reduce this pan temperature.
Optionally, as shown in fig. 5, in the embodiment, the pot temperature detecting method of the present invention further includes: in the production process of the electromagnetic heating device, the following steps are carried out:
b1, obtaining the corresponding initial magnetic permeability of the cookware at an initial temperature through pretesting;
b2, adjusting the temperature of the pot to be a plurality of temperatures, and calculating a plurality of magnetic conductivities corresponding to the temperatures according to the initial temperatures and the initial magnetic conductivities corresponding to the initial temperatures;
b3, calculating a plurality of inductance values of the heating coil in the heating process of the heating circuit 10 according to the plurality of magnetic permeabilities;
b4, recording a plurality of temperatures and a plurality of inductance values of the heating coil to generate corresponding relation data of the pot temperature and the inductance value of the heating coil;
in step a2, obtaining the real-time temperature of the corresponding pot according to the real-time inductance value includes: the central processing unit acquires real-time temperature of the cookware corresponding to the real-time inductance value according to the corresponding relation data;
specifically, the initial permeability of the cookware at an initial temperature can be obtained through routine tests, and it can be understood that once the cookware is selected, the corresponding permeability is actually a known parameter. However, in the calculation of the actual magnetic permeability of the cookware, only the initial magnetic permeability corresponding to a certain temperature of the cookware needs to be obtained, so that the magnetic permeability of the cookware at different temperatures can be obtained according to the initial temperature and the initial magnetic permeability. Can obtain the magnetic permeability under the different temperatures that the pan corresponds in electromagnetic heating device's production process, can calculate the inductance value that heating coil of heating circuit 10 corresponds according to the different magnetic permeability of pan simultaneously. Therefore, the corresponding relation between the temperature of the cookware and the heating coil can be obtained, and the relation is stored to establish the corresponding relation data between the temperature of the cookware and the real-time inductance value of the heating coil. Therefore, on the basis of the above, in step a2, obtaining the real-time temperature of the corresponding pot according to the real-time inductance value can be understood as obtaining the real-time temperature of the pot corresponding to the real-time inductance value through the corresponding relationship data between the pot temperature and the inductance value of the heating coil.
In another embodiment, in step a2, obtaining the real-time temperature of the pot according to the real-time inductance value includes:
a21, the central processing unit obtains the characteristic parameters of the heating coil to calculate the real-time magnetic conductivity of the cookware corresponding to the real-time inductance value according to the real-time inductance value of the heating coil;
a22, the CPU obtains the temperature coefficient of the pot, the initial temperature of the pot and the initial magnetic conductivity corresponding to the initial temperature, and the real-time magnetic conductivity of the pot, so as to calculate the real-time temperature of the pot.
Specifically, after the heating coil is manufactured, the characteristic parameters of the heating coil can be understood as known parameters, the real-time inductance value of the heating coil in the heating process is obtained, and the real-time magnetic permeability of the cookware corresponding to the real-time inductance value can be calculated according to the real-time inductance value. Meanwhile, the real-time temperature of the cookware is calculated according to the temperature coefficient of the cookware, the initial temperature of the cookware and the corresponding initial magnetic conductivity. It will be appreciated that once a pot is selected, the temperature coefficient of the pot, the initial temperature of the pot and its corresponding initial permeability may also be understood as known parameters.
Further, on the above basis, in step B2, the calculation formula for calculating the plurality of magnetic permeabilities corresponding to the plurality of temperatures includes:
μs＝αμμ1*(Ts-T1)+μ1
wherein, musFor permeability of pots, TsTemperature of the pot, T1Is the initial temperature of the pot, mu1For pots at a temperature of T1Initial permeability of time, alphaμIs the temperature coefficient of the cooker; specifically, a pot is selected at one point, and the temperature coefficient alpha isμThe magnetic permeability of the cookware is also a known parameter, the magnetic permeability can also be understood as a known parameter, the initial magnetic permeability corresponding to the temperature of the cookware can be obtained through a conventional test mode, the corresponding relation between the magnetic permeability of the cookware and the temperature of the cookware can be obtained according to the known temperature coefficient of the cookware, and the corresponding relation data of the magnetic permeability of a plurality of cookware and the temperature of the cookware can be calculated.
In step B3, the calculation formula for calculating the inductance values of the heating coil during heating of the corresponding heating circuit 10 based on the magnetic permeabilities includes:
wherein L is a real-time inductance value, μ, of the heating coilsIs the real-time magnetic conductivity of the pan, K is a constant, mu0The method comprises the following steps of (1) setting the vacuum magnetic conductivity of a cooker, wherein N is the number of turns of a heating coil, S is the cross section area of the heating coil, and l is the length of the heating coil; in particular, a heating deviceOnce production is completed, the characteristic parameters of the heating coil are also determined, i.e., it can be understood that the characteristic parameters thereof are known parameters, where the characteristic parameters of the heating coil include the above-mentioned number of turns N of the heating coil, the cross-sectional area S of the heating coil, the length l of the heating coil, and the characteristic constant K of the heating coil; at the same time, once the pot is selected, the vacuum permeability mu of the pot is0Also known parameters, and under the condition that the parameters are all known parameters, the real-time inductance value L of the heating coil and the real-time magnetic permeability mu of the cooker can be knownsIn the above known cookware, while the real-time permeability μ of the cookwaresAfter the corresponding relation with the real-time temperature of the cookware, the real-time temperature of the cookware can be obtained through the established corresponding relation after the real-time inductance value of the heating coil is obtained.
In another embodiment, during the use of the pot, in step a21, the calculation formula for calculating the real-time permeability of the pot corresponding to the real-time inductance value according to the real-time inductance value of the heating coil includes:
wherein, musIs the real-time magnetic conductivity of the pan, K is a constant, mu0The method comprises the following steps of (1) setting the vacuum magnetic conductivity of a cooker, wherein N is the number of turns of a heating coil, S is the cross section area of the heating coil, L is the real-time inductance value of the heating coil, and L is the length of the heating coil; once the production of the heating device is completed, the characteristic parameters of the heating coil are also determined, i.e., it can be understood that the characteristic parameters thereof are known parameters, where the characteristic parameters of the heating coil include the number of turns N of the heating coil, the cross-sectional area S of the heating coil, the length l of the heating coil, and the specific constant K of the heating coil mentioned above; at the same time, once the pot is selected, the vacuum permeability mu of the pot is0Also is a known parameter, and under the condition that the parameters are all known parameters, the real-time permeability mu of the cookware can be knownsThe real-time inductance value L of the heating coil.
In step a22, the calculation formula for calculating the real-time temperature of the pot includes:
wherein, TsIs the temperature of the pot, musFor permeability of pots, T1Is the initial temperature of the pot, mu1For a pot at a temperature of T1Initial permeability of time, alphaμIs the temperature coefficient of the cooker. Pot one-point selection, its temperature coefficient alphaμThe magnetic permeability of the cookware is also a known parameter, the initial magnetic permeability corresponding to the temperature of the cookware can be obtained through a conventional test mode, and the corresponding relation between the cookware temperature and the magnetic permeability of the cookware can be obtained according to the known temperature coefficient of the cookware. On the basis of the above, the real-time magnetic permeability mu of the pot is obtainedsWith the relation of the real-time inductance value L of heating coil, then through this description, can acquire the relation of the real-time inductance value L of pan temperature and heating coil, can acquire the real-time temperature that the pan corresponds through the real-time inductance value of the heating coil who acquires promptly.
Optionally, in step a1, monitoring the real-time inductance value of the heating coil during the heating process of the heating circuit 10 and acquiring the corresponding sampling signal includes:
detecting real-time voltage of a heating coil and generating a corresponding voltage sampling signal;
detecting real-time current of a heating coil and generating a corresponding current sampling signal;
in step a2, the central processing unit receiving and processing the sampled signal to obtain the real-time inductance value comprises:
the central processing unit receives the current sampling signal to obtain the current change rate of the heating coil and uses the formula UL＝LsCalculating real-time inductance values of the heating coils by di (t)/dt;
wherein L issFor real-time inductance of the heating coil, ULThe voltage value corresponding to the voltage sampling signal is shown, and di (t)/dt is the current change rate of the heating coil.
Specifically, the real-time inductance value of the heating coil may be obtained by measuring the voltage and the current by the sampling circuit 20, obtaining the current change rate of the heating coil according to the current, and finally obtaining the real-time inductance value of the heating coil.
In another embodiment, in step a1, monitoring the real-time inductance value of the heating coil during heating by the heating circuit 10 and acquiring a corresponding sampling signal includes:
a11, detecting the real-time working frequency of the corresponding resonance circuit and generating a corresponding frequency sampling signal when the heating coil works;
a12, the central processing unit obtains the capacitance value of the resonance capacitor of the resonance circuit and receives the frequency sampling signal to calculate the real-time inductance value of the heating coil. Specifically, the calculation can be performed according to the following formula.
Wherein f is the operating frequency of the circuit, C is the capacitance of the resonant capacitor, and L is the inductance of the heating coil. In particular, at the completion of the production of the heating device, the resonant capacitance thereof is also determined, the capacitance value thereof being understood as a known parameter. The real-time inductance value of the heating coil during heating can be obtained by the operating frequency of the heating coil obtained by the sampling circuit 20.
Further, step a12 includes:
a121, the central processing unit acquires a nominal value of a resonance capacitor and a capacitance value temperature characteristic curve of the resonance capacitor;
a122, detecting the ambient temperature and generating a corresponding temperature sampling signal;
a123, the central processing unit receives the temperature sampling signal and calculates a working capacitance value of the resonance capacitor according to a nominal value of the resonance capacitor and a capacitance value temperature characteristic curve of the resonance capacitor;
and A124, calculating the real-time inductance value of the heating coil by the central processing unit according to the working capacitance value.
Specifically, the capacitance value of the resonant capacitor has a temperature characteristic, which slightly changes with the change of the ambient temperature, and the obtained capacitance value of the resonant capacitor can be obtained according to the nominal value of the resonant capacitor and the temperature characteristic curve of the capacitance value of the resonant flashlight. Specifically, the sampling circuit 20 may first detect the ambient temperature and obtain the working capacitance value of the resonant capacitor at the ambient temperature according to the ambient temperature, that is, obtain the real-time inductance value of the heating coil according to the working capacitance value.
It is to be understood that the foregoing examples are merely illustrative of the preferred embodiments of the present invention, which are described in some detail and detail, but are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (11)
1. A pot temperature detection device, its characterized in that includes:
the heating circuit comprises a heating coil for generating heat to heat the cooker;
the sampling circuit is connected with the heating coil and is used for monitoring the real-time inductance value of the heating coil in the heating process of the heating circuit and acquiring a corresponding sampling signal;
the signal processing unit is connected with the sampling circuit and used for receiving the sampling signal to acquire real-time temperature of the cookware;
the first storage unit is used for storing a preset temperature;
the comparison unit is connected with the signal processing unit and the first storage unit and is used for comparing the real-time temperature of the cooker with the preset temperature and outputting a comparison result;
the signal output unit is connected with the comparison unit and used for receiving the comparison result to generate a corresponding power adjustment signal;
the power driving circuit is connected with the signal output unit and the heating circuit and used for receiving and adjusting the input power of the heating circuit according to the power adjusting signal in the heating process of the heating circuit so as to adjust the temperature of the pot;
a third storage unit for storing characteristic parameters of the heating coil;
the first calculating unit is connected with the signal processing unit and the third storage unit and is used for calculating the real-time magnetic conductivity of the cookware according to the real-time inductance value of the heating coil;
the fifth storage unit is used for storing the temperature coefficient of the cookware, the initial temperature of the cookware and the initial magnetic conductivity corresponding to the initial temperature;
and the second calculating unit is connected with the fifth storage unit and the first calculating unit and is used for calculating the real-time temperature of the cookware.
2. The pot temperature detecting device according to claim 1, wherein the sampling circuit comprises a voltage detecting module and a current detecting module, and the signal processing unit comprises a first signal processing unit;
the voltage detection module is connected with the heating coil and used for detecting the real-time voltage of the heating coil and generating a corresponding voltage sampling signal;
the current detection module is connected with the heating coil and used for detecting the real-time current of the heating coil and generating a corresponding current sampling signal;
the first signal processing unit receives the voltage sampling signal and the current sampling signal to acquire a real-time inductance value of the heating coil.
3. The pot temperature detecting device according to claim 1, characterized in that the heating circuit further comprises a resonance capacitor connected in parallel with the heating coil, the heating coil and the resonance capacitor forming a resonance circuit;
the sampling circuit comprises a frequency detection module, and the frequency detection module is connected with the resonance circuit and is used for detecting the real-time working frequency of the resonance circuit when the heating coil works and generating a corresponding frequency sampling signal;
the signal processing unit includes a second signal processing unit for storing a capacitance value of the resonance capacitor and receiving the frequency sampling signal to calculate a real-time inductance value of the heating coil according to the capacitance value.
4. The pot temperature detecting device according to claim 3, characterized in that the sampling circuit further comprises a temperature detecting module,
the temperature detection module is used for detecting the ambient temperature and generating a corresponding temperature sampling signal;
the signal processing unit further comprises a third signal processing unit, and the third signal processing unit is used for storing the nominal value of the resonance capacitor and the capacitance value temperature characteristic curve of the resonance capacitor, receiving the temperature sampling signal to calculate the working capacitance value of the resonance capacitor, and calculating the real-time inductance value of the heating coil according to the working capacitance value.
5. An electromagnetic heating device, characterized in that, includes the pot temperature detection device of any one of claims 1-4.
6. A pot temperature detection method applied to the electromagnetic heating device of claim 5 is characterized by comprising the following steps:
a1, monitoring the real-time inductance value of the heating coil in the heating process of the heating circuit, acquiring a corresponding sampling signal and sending the sampling signal to the central processing unit;
a2, the central processing unit receives and processes the sampling signal to obtain the real-time inductance value, and obtains the real-time temperature of the corresponding cookware according to the real-time inductance value;
a3, comparing the real-time temperature of the cookware with a preset temperature by the central processing unit to generate a corresponding power adjustment signal according to the comparison result;
a4, the power driving circuit receives and adjusts the input power of the heating circuit according to the power adjusting signal to adjust the temperature of the cookware;
in the step a2, the obtaining the corresponding real-time temperature of the pot according to the real-time inductance value includes:
a21, the central processing unit acquires the characteristic parameters of the heating coil to calculate the real-time magnetic permeability of the cookware corresponding to the real-time inductance value according to the real-time inductance value of the heating coil;
a22, the central processing unit obtains the temperature coefficient of the pot, the initial temperature of the pot and the corresponding initial permeability, and the real-time permeability of the pot to calculate the real-time temperature of the pot.
7. The pot temperature detection method according to claim 6, wherein in the production process of the electromagnetic heating device, the following steps are performed:
b1, obtaining the corresponding initial magnetic permeability of the cookware at an initial temperature through pretesting;
b2, adjusting the temperature of the pot to be a plurality of temperatures, and calculating a plurality of magnetic conductivities corresponding to the temperatures according to the initial temperatures and the initial magnetic conductivities corresponding to the initial temperatures;
b3, respectively calculating a plurality of inductance values of the heating coil in the heating process of the heating circuit according to the plurality of magnetic conductivities;
b4, recording the temperatures and the inductance values of the heating coil to generate corresponding relation data of the pot temperature and the inductance value of the heating coil;
in the step a2, the obtaining the corresponding real-time temperature of the pot according to the real-time inductance value includes:
and the central processing unit acquires the real-time temperature of the cookware corresponding to the real-time inductance value according to the corresponding relation data.
8. The pot temperature detecting method according to claim 7, characterized in that,
in step B2, the calculation formula for calculating the plurality of magnetic permeabilities corresponding to the plurality of temperatures includes:
μs＝αμμ1*(Ts-T1)+μ1
wherein, musPermeability of pot tool, TsFor temperature of the pot, T1Is the initial temperature of the pot, mu1For a pot at a temperature of T1Initial permeability of time, alphaμIs the temperature coefficient of the pot;
in step B3, the calculation formula for calculating the inductance values of the heating coil in the heating process of the corresponding heating circuit from the magnetic permeabilities includes:
wherein L is the real-time inductance value of the heating coil, μsIs the real-time magnetic conductivity of the pan, K is a constant, mu0The method comprises the following steps of (1) setting the vacuum magnetic conductivity of a cooker, wherein N is the number of turns of a heating coil, S is the cross section area of the heating coil, and l is the length of the heating coil;
or
In the step a21, the calculation formula for calculating the real-time permeability of the pot corresponding to the real-time inductance value according to the real-time inductance value of the heating coil includes:
wherein, musIs the real-time magnetic conductivity of the pan, K is a constant, mu0The method comprises the following steps of (1) setting the vacuum magnetic conductivity of a cooker, wherein N is the number of turns of a heating coil, S is the cross section area of the heating coil, L is the real-time inductance value of the heating coil, and L is the length of the heating coil;
in the step a22, the calculation formula for calculating the real-time temperature of the pot includes:
wherein, TsIs the temperature of the pot, musFor permeability of pots, T1Is the initial temperature of the pot, mu1For pots at a temperature of T1Initial permeability of time, alphaμIs the temperature coefficient of the cooker.
9. The pot temperature detecting method according to claim 8,
in the step a1, the monitoring real-time inductance value of the heating coil during heating of the heating circuit and acquiring corresponding sampling signals includes:
detecting real-time voltage of the heating coil and generating a corresponding voltage sampling signal;
detecting real-time current of the heating coil and generating a corresponding current sampling signal;
in the step a2, the receiving and processing the sampled signal by the central processing unit to obtain a real-time inductance value includes:
the central processing unit receives the current sampling signal to obtain the current change rate of the heating coil and obtains the current change rate according to a formula UL＝LsCalculating a real-time inductance value of the heating coil;
wherein L issFor real-time inductance of the heating coil, ULAnd di (t)/dt is the current change rate of the heating coil and is the voltage value corresponding to the voltage sampling signal.
10. The pot temperature detecting method according to claim 8, wherein in the step a1, the monitoring real-time inductance value of the heating coil during heating of the heating circuit and obtaining the corresponding sampling signal comprises:
a11, detecting the real-time working frequency of the corresponding resonance circuit and generating a corresponding frequency sampling signal when the heating coil works;
a12, the central processing unit obtains the capacitance value of the resonance capacitor forming the resonance circuit, and receives the frequency sampling signal to calculate the real-time inductance value of the heating coil.
11. The pot temperature detecting method according to claim 10, wherein the step a12 includes:
a121, the central processing unit acquires a nominal value of the resonance capacitor and a capacitance value temperature characteristic curve of the resonance capacitor;
a122, detecting the ambient temperature and generating a corresponding temperature sampling signal;
a123, the central processing unit receives the temperature sampling signal and calculates a working capacitance value of the resonance capacitor according to a nominal value of the resonance capacitor and a capacitance value temperature characteristic curve of the resonance capacitor;
and A124, the central processing unit calculates the real-time inductance value of the heating coil according to the working capacitance value.
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