CN110572893A - Electromagnetic heating device and temperature control method - Google Patents
Electromagnetic heating device and temperature control method Download PDFInfo
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- CN110572893A CN110572893A CN201910799381.7A CN201910799381A CN110572893A CN 110572893 A CN110572893 A CN 110572893A CN 201910799381 A CN201910799381 A CN 201910799381A CN 110572893 A CN110572893 A CN 110572893A
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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
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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Abstract
The invention relates to an electromagnetic heating device, comprising an electromagnetic heating coil; the detection analysis module is connected with the electromagnetic heating coil and used for detecting the electrical parameters in the electromagnetic heating coil; the input end of the control module is connected with the output end of the detection and analysis module and is used for controlling the heating power or the heating time of the electromagnetic heating coil; the input end of the IGBT driving module is connected with the output end of the control module; the C end of the IGBT is connected with the electromagnetic heating coil, and the G end of the IGBT is connected with the IGBT driving module; the human-computer interaction interface is connected with the detection analysis module, is connected with the control module and transmits the temperature value input by the user to the control module; a temperature sensing layer capable of sensing electromagnetic signals generated by the electromagnetic heating coil is arranged above the electromagnetic heating coil, and the heating device control system and the heating device control method can realize accurate and rapid control of temperatures of multiple temperature points and multiple width ranges.
Description
Technical Field
The invention relates to the technical field of kitchenware, in particular to an electromagnetic heating device with a temperature sensing layer and a temperature control method.
background
At present, cooking appliances such as electromagnetic heating devices and the like are generally used in households, the electromagnetic heating device generally comprises a housing, a panel arranged on the housing, and an electromagnetic heating coil and a control circuit board arranged between the housing and the panel, the electromagnetic heating device of the common structure can meet the heating requirement, and after the electromagnetic heating device is started, the electromagnetic heating coil is electrified and generates heat which is transmitted to appliances to be heated such as a cooker and the like through the panel. However, the common electromagnetic heating device cannot control the temperature, and the heating device is always in a heating state after being turned on, and the heating temperature cannot be controlled within a reasonable range.
Disclosure of Invention
The technical problem solved by the invention is to provide an electromagnetic heating device capable of accurately controlling temperature and a temperature control method capable of accurately controlling temperature.
In order to achieve the above object, the present invention provides a technical solution,
An electromagnetic heating device comprising an electromagnetic heating coil for generating an electromagnetic signal, the electromagnetic heating device further comprising:
The detection analysis module is connected with the electromagnetic heating coil and used for detecting the electrical parameters in the circuit of the electromagnetic heating coil;
The input end of the control module is connected with the output end of the detection and analysis module and is used for controlling the heating power or the heating time of the electromagnetic heating ring;
The input end of the IGBT driving module is connected with the output end of the control module;
The C end of the IGBT is connected with the electromagnetic heating coil, and the G end of the IGBT is connected with the IGBT driving module;
The human-computer interaction interface is connected with the detection analysis module and the control module and transmits the temperature value input by the user to the control module;
the temperature sensing layer is arranged above the electromagnetic heating coil and can sense an electromagnetic signal generated by the electromagnetic heating coil, the temperature sensing layer and the electromagnetic heating coil form coupling impedance, the temperature sensing layer has an initial critical value of temperature change and an ending critical value of temperature change, and the temperature sensing layer has the following relation with the coupling impedance under the action of the electromagnetic signal in a temperature range defined by the initial critical value of temperature change and the ending critical value of temperature change:
K＝|(R2-R1)/[R1×(T2-T1)]|
Wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
R2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
k is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
The R1 and R2 are coupling impedance values of two ends of the electromagnetic heating coil which are measured by an electric bridge under specific conditions, the specific conditions are defined in the patent, the electromagnetic heating coil is made by winding 300 turns of a 10 mm-diameter 10 mm-length TDK PC40 magnetic rod by a 0.2 mm-diameter copper wire, the distance between the electromagnetic heating coil and the temperature sensing layer is 5mm, and the power is 25 kHz.
K is less than or equal to 10.
the electromagnetic heating device comprises a panel, the temperature sensing layer is arranged on the panel, or a cooker is arranged above the electromagnetic heating device, and the temperature sensing layer is arranged on the cooker.
The temperature sensing layers are at least two, and the initial critical values of the temperature change of different temperature sensing layers are different.
The temperature sensing layers are circular, square or square, and the different temperature sensing layers are concentrically arranged.
the temperature sensing layers are fan-shaped, and different temperature sensing layers are arranged at intervals.
Gaps are arranged among different temperature sensing layers, and the gaps are 1-5 mm.
The temperature sensing layers are two types, namely a first temperature sensing layer and a second temperature sensing layer, the initial critical value of the first temperature change of the first temperature sensing layer is 30-70 ℃, the ending critical value of the first temperature change is 90-150 ℃, the initial critical value of the second temperature change of the second temperature sensing layer is 100-200 ℃, the ending critical value of the second temperature change is 200-300 ℃, the temperature sensing layers are one type and are arranged in the middle of the electromagnetic heating device, and the periphery of the temperature sensing layers is a metal layer or a nonmetal layer.
the area of the temperature sensing layer is smaller than that of the electromagnetic heating coil.
The diameter of the temperature sensing layer is larger than 1/4 of the diameter of the electromagnetic heating coil and smaller than 1/2 of the diameter of the electromagnetic heating coil.
A method of controlling temperature, comprising the steps of:
Step 1: providing an electromagnetic heating coil and a temperature sensing layer capable of sensing an electromagnetic signal generated by the electromagnetic heating coil, wherein the temperature sensing layer and the electromagnetic heating coil form a coupling impedance, the temperature sensing layer has an initial temperature change critical value and an end temperature change critical value, and the temperature sensing layer has the following relation with the coupling impedance under the action of the electromagnetic signal in a temperature interval defined by the initial temperature change critical value and the end temperature change critical value:
K＝|(R2-R1)/[R1×(T2-T1)]|
Wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
r2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
K is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
r1 and R2 are coupling impedance values of two ends of an electromagnetic heating coil which are measured by an electric bridge under specific conditions, the specific conditions are defined in the patent, the electromagnetic heating coil is made by winding 300 turns of a 10 mm-diameter 10 mm-length TDK PC40 magnetic bar by a 0.2 mm-diameter copper wire, the distance between the electromagnetic heating coil and a temperature sensing layer is 5mm, the power is 25kHz,
Step 2: and setting a corresponding relation between an electrical parameter of the electromagnetic heating coil circuit and the temperature of the temperature sensing layer, wherein the electrical parameter comprises coupling impedance formed by the temperature sensing layer and the electromagnetic heating coil, and current, voltage or pulse signals of the electromagnetic heating coil circuit.
And step 3: setting the control temperature to Tn；
and 4, step 4: the electric parameters of the electromagnetic heating coil circuit are detected and obtained, and then the electric heating device is adjusted by the control unit according to the electric parameter values or the temperature values corresponding to the electric parameter values, so that the temperature value of the cooking utensil is controlled within an expected range.
When the electrical parameter is a coupling impedance value formed by the temperature sensing layer and the electromagnetic heating coil, the error range of the coupling impedance is 0-5 omega, when the electrical parameter is a current value, the error range of the current value is 0-0.5A, when the electrical parameter is a voltage value, the error range of the voltage value is 0-50V, and when the electrical parameter is a pulse signal, the error range of the pulse signal is 0-3.
The electromagnetic oven is also provided with a timing module, the electromagnetic heating coil starts heating and starts the timing module to time, and when the timing time is M1When the heating is needed, the heating time is recorded as M2Said M is1≥M2。
M is less than or equal to 300 seconds1Less than or equal to 600 seconds, and less than or equal to M in 0.1 second2Less than or equal to 300 seconds.
the temperature sensing layers are at least two, and the initial critical values of the temperature change of different temperature sensing layers are different.
The temperature sensing layer is a metal layer, and the area of the temperature sensing layer is smaller than that of the electromagnetic heating coil.
compared with the prior art, the invention has the beneficial effects that: the temperature of the temperature sensing layer can be detected through the electric parameter value of the electromagnetic heating coil, at the moment, the electric parameter value in the electromagnetic heating coil can reflect the temperature of the temperature sensing layer more accurately, and the temperature measurement precision is higher.
Drawings
FIG. 1 is a circuit framework diagram of the present invention;
FIG. 2 is a schematic diagram showing a relationship between the temperature of the temperature sensing layer and the coupling impedance according to the present invention;
FIG. 3 is a schematic diagram showing another relationship between the temperature of the temperature sensing layer and the coupling impedance according to the present invention;
FIG. 4 is a schematic structural view of example 2 of the present invention;
FIG. 5 is a schematic structural view of example 3 of the present invention;
fig. 6 is a schematic structural diagram of embodiment 4 of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example 1
as shown in fig. 1, the present invention relates to an electromagnetic heating device, which is an electromagnetic oven in this embodiment, and includes an electromagnetic heating coil for generating an electromagnetic signal;
The temperature sensing layer is arranged above the electromagnetic heating coil, can sense an electromagnetic signal generated by the electromagnetic heating coil, and is preferably arranged on a panel of the electromagnetic oven;
The detection analysis module is connected with the electromagnetic heating coil and used for detecting the coupling impedance formed by the electromagnetic heating coil and the temperature sensing layer; the input end of the control module is connected with the output end of the detection and analysis module and is used for controlling the heating power or the heating time of the electromagnetic heating ring;
The input end of the IGBT driving module is connected with the output end of the control module;
The C end of the IGBT is connected with the electromagnetic heating coil, and the G end of the IGBT is connected with the IGBT driving module;
The human-computer interaction interface is connected with the detection analysis module and the control module and transmits the temperature value input by the user to the control module;
The temperature sensing layer and the electromagnetic heating coil mutually influence under the action of an electromagnetic signal to form coupling impedance, a certain corresponding relation exists between the coupling impedance and the temperature of the temperature sensing layer, a specific temperature curve relation is formed between the coupling impedance and the temperature of the temperature sensing layer, the temperature curve at least has one inflection point, and usually and preferably has two inflection points which are respectively a first temperature inflection point and a second temperature inflection point, the value of the first temperature inflection point is smaller than that of the second temperature inflection point, the curve before the first temperature inflection point and the curve after the second temperature inflection point both tend to be horizontal straight lines, namely before the first temperature inflection point, the coupling impedance hardly changes or does not obviously change, and similarly, after the second temperature inflection point, the coupling impedance hardly changes or does not obviously change, but between the first temperature inflection point and the second temperature inflection point, the temperature curve shows a relatively obvious linear relationship, that is, the temperature of the temperature sensing layer changes with the difference of the coupling impedance, so that a one-to-one correspondence relationship is formed between the temperature value of the temperature sensing layer and the coupling impedance value, and the linear relationship is different due to the difference of the materials of the temperature sensing layer, for example, the temperature value of the temperature sensing layer and the coupling impedance value can be in a direct proportional relationship or an inverse proportional relationship. The temperature interval between the first temperature inflection point and the second temperature inflection point is an effective temperature interval for temperature control, and in the effective temperature interval, the corresponding temperature value of the temperature sensing layer can be obtained as long as the coupling impedance value formed by the temperature sensing layer and the electromagnetic heating coil is known. Therefore, the first temperature inflection point is also called an initial temperature change threshold, and the second temperature inflection point is also called an end temperature change threshold.
The temperature sensing layer used in this patent has the above characteristics, that is, in the curve relationship between the coupling impedance value of the temperature sensing layer and the electromagnetic heating coil and the temperature value of the temperature sensing layer in this patent, at least in a certain temperature interval, when the temperature of the temperature sensing layer changes by 1 ℃, the following relationship exists:
K＝|(R2-R1)/[R1×(T2-T1)]|
Wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
r2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
K is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
The R1 and R2 are coupling resistance values of two ends of an electromagnetic heating coil which are supposed to be measured through an electric bridge under a certain condition, the patent defines that the certain condition is a supposed detection condition, namely the electromagnetic heating coil is made of a TDKPC40 magnetic rod with the diameter of 10mm and the length of 10mm by winding 300 turns of a copper wire with the diameter of 0.2mm, the distance between the electromagnetic heating coil and a temperature sensing layer is 5mm, the power is 25kHz, and the coupling resistance values of the two ends of the electromagnetic heating coil are measured under the supposed condition. The specific conditions for such detection are defined in this patent in order to provide a standard for determining the curve relationship between the coupling impedance and the temperature of the temperature-sensitive layer, and to better describe the specific properties of the temperature-sensitive layer, but this definition should not be considered as a limitation of this patent, it being easily conceivable that the coefficient K in the relationship will change when the specific conditions for detection defined in this patent are changed, but the specific temperature characteristic of the temperature-sensitive layer will not qualitatively change from definition to definition.
in general, the first inflection point can also be considered as a transition point where K is from 0.05 or less to 0.05 or more at the first occurrence in the curve, and the second inflection point can be considered as a transition point where K is from 0.05 or more to 0.05 or less.
This patent temperature sensing layer is two kinds at least, and the initial critical value of the temperature variation on different temperature sensing layers is different, through the combined action on multiple different temperature sensing layers, then can prolong the actual effective temperature interval that is used for carrying out temperature control. Preferably, the temperature sensing layers are two, respectively a first temperature sensing layer and a second temperature sensing layer, and respectively have different initial critical values of temperature change, and further preferably, the initial critical value of temperature change of the second temperature sensing layer is located between the initial critical value of temperature change of the first temperature sensing layer and the ending critical value of temperature change, of course, the initial critical value of temperature change of the second temperature sensing layer may also be greater than the ending critical value of temperature change of the first metal, as shown in fig. 2-3, where a in fig. 3 is the initial critical value of temperature change of the first temperature sensing layer, b is the initial critical value of temperature change of the second temperature sensing layer, and c is the ending critical value of temperature change of the second temperature sensing layer.
for example, the first temperature change initial critical value of the first temperature sensing layer is 70 degrees celsius, the first temperature change ending critical value is 90 degrees celsius, the second temperature change initial critical value of the second temperature sensing layer is 80 degrees celsius, and the second temperature change ending critical value is 100 degrees celsius, so that when the first metal and the second metal are used simultaneously, the electromagnetic oven can realize temperature control between 70 degrees celsius and 100 degrees celsius.
For another example, the first temperature change initial critical value of the first temperature sensing layer is 70 degrees celsius, the first temperature change end critical value is 90 degrees celsius, the second temperature change initial critical value of the second temperature sensing layer is 100 degrees celsius, and the second temperature change end critical value is 120 degrees celsius, when the first metal and the second metal are used simultaneously, the electromagnetic oven can realize temperature control between 70 degrees celsius to 90 degrees and between 100 degrees celsius to 120 degrees, that is, can realize temperature control of a plurality of effective temperature intervals.
Preferably, different temperature sensing layers are arranged along a plane, and the arrangement mode can be concentric circle arrangement or adjacent fan-shaped arrangement.
preferably, K is more than or equal to 0.05 and less than or equal to 10.
The electromagnetic heating device comprises a panel, the temperature sensing layer is arranged on the panel, or a cooker is arranged above the electromagnetic heating device, and the temperature sensing layer is arranged on the cooker.
The metal material is preferably precision alloy 4J 36.
the thickness of the temperature sensing layer is preferably 0.1 to 3mm, and in this embodiment 1.5 mm. When the temperature sensing layer is arranged on the cooker, the temperature sensing layer can be made into the whole cooker or can be used as a part of the cooker, and the temperature sensing layer and the cooker main body are combined together through riveting, welding, meltallizing, printing and other methods. When the temperature sensing layer is arranged on the panel of the induction cooker, the temperature sensing layer can be positioned on the upper surface of the panel and also can be positioned on the lower surface of the panel, and when the panel is of a composite structure, the temperature sensing layer can also be arranged between the upper surface and the lower surface of the panel.
example 2
in this embodiment, the temperature sensing layer is disposed on a pot disposed above the electromagnetic heating coil in embodiment 1.
As shown in fig. 4, the pot comprises a pot bottom 1 and a pot body 2, the pot bottom 1 is provided with a first temperature sensing layer 3 and a second temperature sensing layer 4, the first temperature sensing layer is circular, the second temperature sensing layer 4 is annular, the second temperature sensing layer 4 is arranged on the periphery of the first temperature sensing layer 1, and the first temperature sensing layer and the second temperature sensing layer are arranged in concentric circles.
In addition, the temperature sensing layer can also be one type, is arranged in the middle of a panel of the electromagnetic heating device or the middle of a cooker, and is a metal layer or a nonmetal layer at the periphery, wherein the nonmetal layer is preferably made of ceramic and other materials.
example 3
This embodiment is an improvement on embodiment 2, in which, as shown in fig. 5, the temperature sensing layers are provided with four layers, that is, a first temperature sensing layer 304, a second temperature sensing layer 305, a third temperature sensing layer 306 and a fourth temperature sensing layer 307, the first temperature sensing layer 304 is square, the second temperature sensing layer 305 to the fourth temperature sensing layer 307 are square, the four temperature sensing layers are nested concentrically, the first temperature sensing layer 304 and the third temperature sensing layer 306 are the same except for the shape, the second temperature sensing layer 305 and the fourth temperature control layer 307 are the same except for the shape, and the temperature sensing layers are provided with a gap, the gap is 1-5mm, preferably 2-3 mm.
Example 4
in this embodiment, an improvement is made on the basis of embodiment 2, as shown in fig. 6, two temperature sensing layers are provided, that is, a first temperature sensing layer 308 and a second temperature sensing layer 309 are provided, and the two temperature sensing layers are arranged at intervals in a fan-shaped structure.
example 5
the patent also provides a method for controlling temperature, which comprises the following steps:
step 1: the electromagnetic heating coil in the electromagnetic oven can generate an electromagnetic signal under the working state, and a temperature sensing layer positioned above the electromagnetic heating coil can generate the electromagnetic signal, wherein the temperature sensing layer has the characteristics of embodiment 1, namely, the coupling impedance formed by the temperature sensing layer and the electromagnetic heating coil has the following relationship when the temperature of the temperature sensing layer changes by 1 ℃:
K＝|(R2-R1)/[R1×(T2-T1)]|
wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
r2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
K is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
The R1 and R2 are coupling resistance values of two ends of an electromagnetic heating coil which are supposed to be measured through an electric bridge under a certain condition, the patent defines that the certain condition is a supposed detection condition, namely the electromagnetic heating coil is made of a TDKPC40 magnetic rod with the diameter of 10mm and the length of 10mm by winding 300 turns of a copper wire with the diameter of 0.2mm, the distance between the electromagnetic heating coil and a temperature sensing layer is 5mm, the power is 25kHz, and the coupling resistance values of the two ends of the electromagnetic heating coil are measured under the supposed condition.
The temperature sensing layers are at least two, the initial critical values of the temperature change of different temperature sensing layers are different,
step 2: setting a corresponding relation between the coupling impedance formed by the temperature sensing layer and the electromagnetic heating coil and the temperature of the temperature sensing layer, wherein the corresponding relation can be implanted into the electromagnetic heating device through programming;
and step 3: the control temperature to be achieved is set through a human-computer interaction interface and is recorded as Tn，TnThe coupling resistance value is recorded as R between the minimum temperature change initial critical value and the maximum temperature change end critical valuen。
And 4, step 4: detecting and obtaining a coupling impedance value formed by the temperature sensing layer and the electromagnetic heating coil, and recording the value as RtThen according to the coupling impedance value Rtor the coupling resistance value Rtthe corresponding temperature value is controlled in an expected range by adjusting the electric heating device through the control unit;
when the coupling impedance value formed by the temperature sensing layer and the electromagnetic heating coil is in direct proportion to the temperature value of the temperature sensing layer and R ist<Rn+ Delta R, the temperature of the temperature sensing layer is lower than TnThe electromagnetic heating coil continues to heat or improves the heating power; when R ist≧RnAnd when the temperature is + delta R, the electromagnetic heating coil stops heating or reduces heating power, and the delta R is an error value.
When the coupling impedance value formed by the temperature sensing layer and the electromagnetic heating coil is in inverse proportion relation with the temperature value of the temperature sensing layer and R ist>Rn+ Delta R, the temperature of the temperature sensing layer is lower than TnThe electromagnetic heating coil continues to heat or improves the heating power; when R ist≤RnWhen + delta R, the electromagnetic heating coil stops heating or reduces heatingThermal power;
Such as setting TnThe temperature is 230 ℃, the detection analysis module continuously detects a coupling impedance value formed by the temperature sensing layer and the electromagnetic heating coil, a temperature value corresponding to the impedance value is obtained through a table look-up method according to the impedance value, and then the temperature value and a set value T are obtainednAnd comparing, wherein when the detection value is smaller than the set value, the control module enables the electromagnetic heating coil to continuously heat, maintains the original heating power, or improves the heating power, or prolongs the heating time and the like, so that the temperature of the temperature sensing layer is continuously increased until the detection temperature value corresponding to the coupling impedance value is equal to the set value. On the contrary, when the detection value is higher than the set value, the control module stops heating or reduces heating power or heating time through circuit control.
as an extension, since the coupling impedance value formed by the temperature sensing layer and the electromagnetic heating coil and the current, voltage, pulse signal and other electrical parameters of the electromagnetic coil or the circuit where the electromagnetic coil is located have a certain corresponding relationship, the present patent can also determine the temperature value of the temperature sensing layer corresponding to the temperature value by detecting the current, voltage, pulse signal and other electrical parameters in the circuit.
preferably, Δ R is greater than or equal to 0 and less than or equal to 5 Ω, a current error value is 0 to 0.5A when temperature control is performed by detecting current, a voltage error value is 0 to 50V when temperature control is performed by detecting voltage, and an error value of a pulse signal is 0 to 3 when temperature control is performed by detecting a pulse signal.
preferably, the induction cooker is further provided with a timing module, the electromagnetic heating coil starts heating and starts the timing module to time, and when the timing time is M1when the heating is needed, the heating time is recorded as M2Said M is1≥M2For example, 300 seconds ≦ M1less than or equal to 600 seconds, and less than or equal to M in 0.1 second2300 seconds, more specifically, for example, M1600 seconds, M2300 seconds.
thus, the electromagnetic heating device can intensively heat in the initial stage of heating to improve the heating efficiency.
the heating control method of the electromagnetic heating device further comprises the step of detecting the cookware.
Preferably, the detection and heating can be performed simultaneously, or can be performed separately.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (17)
1. An electromagnetic heating device comprises an electromagnetic heating coil for generating an electromagnetic signal, and is characterized by further comprising:
The detection analysis module is connected with the electromagnetic heating coil and used for detecting the electrical parameters in the circuit of the electromagnetic heating coil;
The input end of the control module is connected with the output end of the detection and analysis module and is used for controlling the heating power or the heating time of the electromagnetic heating ring;
the input end of the IGBT driving module is connected with the output end of the control module;
The C end of the IGBT is connected with the electromagnetic heating coil, and the G end of the IGBT is connected with the IGBT driving module;
The human-computer interaction interface is connected with the detection analysis module and the control module and transmits the temperature value input by the user to the control module;
the temperature sensing layer is arranged above the electromagnetic heating coil and can sense an electromagnetic signal generated by the electromagnetic heating coil, the temperature sensing layer and the electromagnetic heating coil form coupling impedance, the temperature sensing layer has an initial critical value of temperature change and an ending critical value of temperature change, and the temperature sensing layer has the following relation with the coupling impedance under the action of the electromagnetic signal in a temperature range defined by the initial critical value of temperature change and the ending critical value of temperature change:
K＝|(R2-R1)/[R1×(T2-T1)]|
wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
R2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
k is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
The R1 and R2 are coupling impedance values of two ends of the electromagnetic heating coil which are measured by an electric bridge under specific conditions, the specific conditions are defined in the patent, the electromagnetic heating coil is made by winding 300 turns of a 10 mm-diameter 10 mm-length TDK PC40 magnetic rod by a 0.2 mm-diameter copper wire, the distance between the electromagnetic heating coil and the temperature sensing layer is 5mm, and the power is 25 kHz.
2. electromagnetic heating device according to claim 1, characterized in that K ≦ 10.
3. The electromagnetic heating device of claim 1, wherein the electromagnetic heating device comprises a panel, and the temperature sensing layer is disposed on the panel, or a pot is disposed above the electromagnetic heating device, and the temperature sensing layer is disposed on the pot.
4. the electromagnetic heating device according to claim 1, wherein the temperature-sensitive layers are at least two, and the initial critical values of the temperature change of different temperature-sensitive layers are different.
5. The electromagnetic heating device of claim 4, wherein the temperature sensing layers are circular, square or square, and the different temperature sensing layers are concentrically arranged.
6. The electromagnetic heating device according to claim 4, wherein the temperature sensing layer is fan-shaped, and different temperature sensing layers are arranged at intervals.
7. An electromagnetic heating apparatus as claimed in claim 4, wherein gaps are provided between different temperature sensing layers, the gaps being 1-5 mm.
8. The electromagnetic heating device according to claim 4, wherein the temperature-sensitive layers are two, namely a first temperature-sensitive layer and a second temperature-sensitive layer, the first temperature-change initial critical value of the first temperature-sensitive layer is 30 to 70 degrees centigrade, the first temperature-change end critical value is 90 to 150 degrees centigrade, the second temperature-change initial critical value of the second temperature-sensitive layer is 100 to 200 degrees centigrade, and the second temperature-change end critical value is 200 to 300 degrees centigrade.
9. The electromagnetic heating device according to claim 1, wherein the temperature sensing layer is a kind of layer, and is disposed in the middle of the electromagnetic heating device, and the periphery of the temperature sensing layer is a metal layer or a non-metal layer.
10. the electromagnetic heating apparatus according to claim 9, wherein an area of the temperature sensitive layer is smaller than an area of the electromagnetic heating coil.
11. The electromagnetic heating device according to claim 10, wherein the diameter of the temperature sensing layer is larger than 1/4 of the diameter of the electromagnetic heating coil and smaller than 1/2 of the diameter of the electromagnetic heating coil.
12. A method of controlling temperature, comprising the steps of:
step 1: providing an electromagnetic heating coil and a temperature sensing layer capable of sensing an electromagnetic signal generated by the electromagnetic heating coil, wherein the temperature sensing layer and the electromagnetic heating coil form a coupling impedance, the temperature sensing layer has an initial temperature change critical value and an end temperature change critical value, and the temperature sensing layer has the following relation with the coupling impedance under the action of the electromagnetic signal in a temperature interval defined by the initial temperature change critical value and the end temperature change critical value:
K＝|(R2-R1)/[R1×(T2-T1)]|
wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
r2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
K is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
the R1 and R2 are coupling impedance values of two ends of the electromagnetic heating coil which are measured by an electric bridge under specific conditions, the specific conditions are defined in the patent, the electromagnetic heating coil is made by winding 300 turns of a 10 mm-diameter 10 mm-length TDK PC40 magnetic rod by a 0.2 mm-diameter copper wire, the distance between the electromagnetic heating coil and the temperature sensing layer is 5mm, and the power is 25 kHz;
Step 2: setting a corresponding relation between an electrical parameter of the electromagnetic heating coil circuit and the temperature of the temperature sensing layer, wherein the electrical parameter comprises coupling impedance formed by the temperature sensing layer and the electromagnetic heating coil, and current, voltage or pulse signals of the electromagnetic heating coil circuit;
and step 3: setting the control temperature to Tn；
And 4, step 4: the electric parameters of the electromagnetic heating coil circuit are detected and obtained, and then the electric heating device is adjusted by the control unit according to the electric parameter values or the temperature values corresponding to the electric parameter values, so that the temperature value of the cooking utensil is controlled within an expected range.
13. The control method according to claim 12, wherein when the electrical parameter is a coupling impedance value formed by the temperature sensitive layer and the electromagnetic heating coil, an error range of the coupling impedance is 0 to 5 Ω, when the electrical parameter is a current value, an error range of the current value is 0 to 0.5A, when the electrical parameter is a voltage value, an error range of the voltage value is 0 to 50V, and when the electrical parameter is a pulse signal, an error range of the pulse signal is 0 to 3.
14. the control method according to claim 12, wherein the induction cooker is further provided with a timing module, the electromagnetic heating coil starts heating and starts timing by the timing module, and when the timing time is M1When the heating is needed, the heating time is recorded as M2said M is1≥M2。
15. the control method of claim 14, wherein M is 300 seconds ≦ M1Less than or equal to 600 seconds, and less than or equal to M in 0.1 second2Less than or equal to 300 seconds.
16. The control method according to claim 12, wherein the number of the temperature sensing layers is at least two, and the temperature change initial threshold values of different temperature sensing layers are different.
17. The control method according to claim 12, wherein the temperature sensing layer is one type, the periphery of the temperature sensing layer is a metal layer, and the area of the temperature sensing layer is smaller than that of the electromagnetic heating coil.
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| CN113613354A (en) * | 2021-10-09 | 2021-11-05 | 江苏新恒基特种装备股份有限公司 | Heating power consumption control method and induction heating device |
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