CN108966390B - Method and device for preventing cookware from being burnt dry - Google Patents
Method and device for preventing cookware from being burnt dry Download PDFInfo
- Publication number
- CN108966390B CN108966390B CN201710351993.0A CN201710351993A CN108966390B CN 108966390 B CN108966390 B CN 108966390B CN 201710351993 A CN201710351993 A CN 201710351993A CN 108966390 B CN108966390 B CN 108966390B
- Authority
- CN
- China
- Prior art keywords
- value
- dry
- power
- heating
- pot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Cookers (AREA)
- Electric Stoves And Ranges (AREA)
Abstract
The invention discloses a method for preventing a cookware from being dry-burned, which comprises the following steps: when heating of a pot is started, a first temperature value when the pot is heated is obtained; when the cookware is continuously heated to the preset dry-burning judgment time, acquiring a second temperature value when the cookware is heated; calculating a dry-fire temperature difference threshold value based on the first temperature value; and calculating the difference value between the second temperature value and the first temperature value, and when the difference value is determined to be greater than the dry-burning temperature difference threshold value, the pot is in a dry-burning state, and the heating of the pot is stopped. The invention also discloses a device for preventing the cookware from being dried.
Description
Technical Field
The invention relates to an electromagnetic heating technology in the electronic field, in particular to a method and a device for preventing a pot from being dry-burned.
Background
Among the prior art, when using electromagnetism cooking utensils to heat the pan, often can face the condition that the water in the pan burns out futilely, when doing the dry combustion method to anhydrous pan, pan bottom temperature surpasses 500 degrees centigrade rapidly for the pan explodes and splits, destroys pan and electromagnetism cooking utensils, and current electromagnetism cooking utensils lack the detection whether to be in the dry combustion method state to the pan, are unfavorable for safe handling electromagnetism cooking utensils.
Disclosure of Invention
In view of the above, the present invention is to provide a method and an apparatus for preventing a pot from being dried, which can accurately determine whether a pot being heated is in a dry-cooking state, and timely stop heating the pot in the dry-cooking state.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides a method for preventing a cookware from being burnt, which comprises the following steps:
when heating of a pot is started, a first temperature value when the pot is heated is obtained;
when the cookware is continuously heated to the preset dry-burning judgment time, acquiring a second temperature value when the cookware is heated;
calculating a dry-fire temperature difference threshold value based on the first temperature value;
and calculating the difference value between the second temperature value and the first temperature value, and when the difference value is determined to be greater than the dry-burning temperature difference threshold value, the pot is in a dry-burning state, and the heating of the pot is stopped.
In the above scheme, the method further comprises:
when the difference value between the second temperature value and the first temperature value is determined to be less than or equal to the dry-burning temperature difference threshold value, the pot is not in a dry-burning state, and the pot is continuously heated with first power;
the following operations are performed at a first fixed time interval starting at a first time:
obtaining a working current value of the heating of the pot at the current moment;
obtaining a value of a second power for heating the pot at the current moment;
acquiring a conduction pulse width value of an insulated gate bipolar transistor heated by the pot at the current moment;
when the first power and the second power are equal, if one of the following conditions is met, the cooker is in a dry-burning state, and heating is stopped:
the difference value between the working current value at the first moment and the working current value at the next moment is greater than the standard current difference value, and meanwhile, the difference value between the conducting pulse width value at the next moment after the first moment and the conducting pulse width value at the first moment is smaller than the standard conducting pulse width difference value;
and the difference value between the working current value at the first moment and the working current value at the next moment is less than or equal to the standard current difference value, and the absolute value of the difference value between the conduction pulse width value at the next moment after the first moment and the conduction pulse width value at the first moment is less than the standard conduction pulse width difference value.
In the above scheme, the method further comprises:
and when the first power and the second power are determined to be not equal, continuing to heat the cookware at the second power.
In the above scheme, the method further comprises:
determining that the difference value between the second temperature value and the first temperature value is less than or equal to the dry-burning temperature difference threshold value, the pot is not in a dry-burning state, and continuing to heat the pot with first power;
starting to acquire a third temperature value of the cooker at the current moment at a second fixed time interval at the first moment;
determining that the third temperature value is greater than or equal to a temperature value corresponding to overheating power, and adjusting the first power until the first power does not exceed the overheating power;
and continuing to heat the pot with the adjusted first power.
In the above scheme, the method further comprises:
and determining that the third temperature value is greater than or equal to the upper limit value of the temperature value, and stopping heating when the cooker is in a dry-burning state.
In the above scheme, the method further comprises:
before the first temperature value of the sensor is obtained,
acquiring a preposed voltage value of the electromagnetic cooker at the current moment and a preposed current value of the electromagnetic cooker at the current moment at a third fixed time interval within a preposed detection time period;
calculating a ceramic pot judgment threshold current value based on the preposed voltage value and the preposed current value;
if the preposed current value is smaller than the ceramic pot judgment threshold current value, judging that the current pot is a ceramic pot.
The embodiment of the invention also provides a device for preventing the dry burning of the cookware, which comprises:
the sensor module is used for acquiring a first temperature value and a second temperature value when the cooker is heated;
the timing module is used for recording the heating time of the cookware and judging whether the continuous heating of the cookware reaches the preset dry-burning judgment time;
the dry-burning temperature difference threshold value calculating module is used for calculating a dry-burning temperature difference threshold value based on the first temperature value;
the dry-burning judging module is used for calculating a difference value between the second temperature value and the first temperature value and judging whether the cooker is in a dry-burning state or not based on the difference value and the dry-burning temperature difference threshold value;
the dry burning judgment module is also used for: sending a heating stopping instruction;
the power output module is used for heating the cookware;
the power output module is further configured to: and receiving the heating stopping instruction, and stopping heating the cookware.
In the above-mentioned scheme, the first step of the method,
the dry burning judgment module is also used for: sending a continuous heating instruction;
the power output module is further configured to: receiving the continuous heating instruction, and heating the cooker with first power;
the device further comprises:
the working current obtaining module is used for obtaining the working current value of the heating of the cooker at the current moment;
the power acquisition module is used for acquiring a value of second power for heating the cooker at the current moment;
the conduction pulse width acquisition module is used for acquiring a conduction pulse width value of the insulated gate bipolar transistor heated by the cookware at the current moment;
the dry-cooking judging module is further configured to judge whether the cooker is in a dry-cooking state or not based on the working current value, a standard current difference value, the value of the first power, the value of the second power, the conduction pulse width value and a standard conduction pulse width difference value.
In the above-mentioned scheme, the first step of the method,
the power output module is further configured to: and receiving the continuous heating instruction, and heating the pot with second power.
In the above-mentioned scheme, the first step of the method,
the sensor module is further configured to: acquiring a third temperature value of the cooker during heating at a second fixed time interval from the first moment;
the dry burning judgment module is further used for judging whether the third temperature value exceeds a temperature value corresponding to the overheating power, and sending an adjustment instruction to the power output module when the third temperature value exceeds the temperature value corresponding to the overheating power;
the power output module is further configured to: and receiving the adjusting instruction, and continuing to heat the cooker with the adjusted first power.
In the above scheme, the apparatus further comprises:
the dry-cooking judging module is further used for judging whether the cookware is in a dry-cooking state or not based on the upper temperature limit value and the third temperature value.
In the above scheme, the apparatus further comprises:
the front voltage acquisition module is used for acquiring a front voltage value of the cooker heating;
the preposed current acquisition module is used for acquiring a preposed current value of the cooker heating;
the ceramic pot judgment threshold current calculation module is used for calculating a ceramic pot judgment threshold current value based on the preposed voltage value and the preposed current value;
and the cooker judgment module is used for judging whether the current cooker is the ceramic cooker or not based on the preposed current value and the ceramic cooker judgment threshold current value.
By the method and the device for preventing the cookware from being dried, the cookware in a dried state can be found in time, the cookware in the dried state is stopped from being continuously heated, the cookware and the electromagnetic cookware are prevented from being damaged due to overheating and cracking, and user experience is improved.
The embodiment of the invention can directly realize the detection of the cookware without limiting the use environment, is simple and convenient to realize, has wider application range and simultaneously improves the user experience.
Drawings
FIG. 1 is a schematic view of an implementation process of a method for preventing dry burning of a pot according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a device for preventing dry burning of a pot according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating an implementation process of the method for determining whether a pot is a ceramic pot according to an embodiment of the present invention;
FIG. 4 is a schematic view illustrating an implementation process of a method for preventing dry-cooking in a pot according to an embodiment of the present invention;
FIG. 5 is a schematic view illustrating an implementation process of a method for preventing dry-cooking in a pot according to a second embodiment of the present invention;
FIG. 6 is a front view of an electromagnetic cooking range with a ceramic pot according to a first embodiment of the present invention;
FIG. 7 is a top view of an electromagnetic cooking appliance with a device for preventing dry burning of cookware in an embodiment of the present invention;
fig. 8 is a cross-sectional view of a ceramic pot used in the first embodiment of the present invention.
Detailed Description
So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified and limited, the term "connected" should be interpreted broadly, for example, it may be electrically connected, or it may be a communication between two elements, or it may be a direct connection or an indirect connection through an intermediate medium, and a person skilled in the art may understand the specific meaning of the above terms according to specific situations.
It should be noted that the terms "first \ second \ third" related to the embodiments of the present invention are merely used for distinguishing similar objects, and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may exchange a specific order or sequence order if allowed. It should be understood that the terms first, second, and third, as used herein, are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or otherwise described herein.
Before further detailed description of the present invention, terms and expressions referred to in the embodiments of the present invention are described, and the terms and expressions referred to in the embodiments of the present invention are applicable to the following explanations.
An electromagnetic heating device: devices for converting electrical energy into thermal energy using the principles of electromagnetic induction, including but not limited to: electromagnetism stove, electromagnetism kitchen and electromagnetic heater.
First, second, and third temperature values: the first temperature value, the second temperature value and the third temperature value are temperatures when the cooker is heated.
Fig. 1 is a schematic view illustrating an implementation process of a method for preventing dry cooking of a pot according to an embodiment of the present invention, as shown in fig. 1, the implementation process of the method for preventing dry cooking of a pot according to the embodiment of the present invention includes the following steps:
step 101: when heating of a pot is started, a first temperature value when the pot is heated is obtained;
step 102: when the cookware is continuously heated to the preset dry-burning judgment time, acquiring a second temperature value when the cookware is heated;
step 103: calculating a dry-fire temperature difference threshold value based on the first temperature value;
step 104: and calculating the difference value between the second temperature value and the first temperature value, and when the difference value is determined to be greater than the dry-burning temperature difference threshold value, the pot is in a dry-burning state, and the heating of the pot is stopped.
In practical application, when the electromagnetic cooker heats a cooker, the number of the sensors in the electromagnetic cooker is preferably two, wherein the temperature measuring range of the first sensor is preferably-20-125 ℃, the temperature curve and the slope of the first sensor are better at 20-100 ℃, and the temperature measurement is more accurate; the second sensor has a temperature measuring range of-20-250 ℃, and has a better temperature curve and slope at 80-160 ℃ and accurate temperature measurement.
When heating of the pot is started, the heating power is a first heating power P1 at the moment, and a first temperature value T1 when the pot is heated is obtained;
when the cookware is continuously heated to a preset dry-burning judgment time, acquiring a second temperature value T2 when the cookware is heated, wherein the preset dry-burning judgment time is preferably 5 minutes;
calculating a dry burning temperature difference threshold Ta, Ta + A × Qm-T1 × B based on the first temperature value, wherein Qm is variable initial heating power, Qm can select a value range (500W-800W), correspondingly, T1 can select a value range (26 ℃ -48 ℃), Ta can select a value range (35 ℃ -65 ℃) A is a constant selectable value 0.06742, B is a constant selectable value 0.9689, and C is a constant selectable value 42.23;
calculating the difference value between the second temperature value and the first temperature value, and when the difference value is determined to be larger than the dry-burning temperature difference threshold value, namely: T2-T1 >. Ta; and the cookware is in a dry-burning state and stops being heated.
In practical application, the method for preventing the dry burning of the cookware further comprises the following steps: determining that the difference value between the second temperature value and the first temperature value is less than or equal to the dry-burning temperature difference threshold value, namely: when T2-T1 ≦ Ta, the pot is not in a dry-burning state, and the pot is continuously heated with the first power P1;
when the electromagnetic cooker continues to heat the pot at the first power P1, the following operations are performed at a first fixed time interval starting at a first moment:
obtaining a working current value In for heating the pot at the current moment;
acquiring a value Pn of a second power for heating the pot at the current moment;
obtaining a conduction pulse width value Tn of an insulated gate bipolar transistor heated by the pot at the current moment;
when the first power P1 and the second power Pn are equal, if one of the following conditions is satisfied, the pot is in a dry-burning state, and heating is stopped:
the difference between the operating current value In at the first time and the operating current value I (n +1) at the next time is greater than the standard current difference ^ Ia, and meanwhile, the difference between the conduction pulse width value T (n +1) at the next time after the first time and the conduction pulse width value Tn at the first time is less than the standard conduction pulse width difference ^ T, that is: In-I (n +1) >. Ia, while T (n +1) -Tn <T;
the difference I (n +1) between the operating current value In at the first time and the operating current value at the next time is less than or equal to the standard current difference ^ Ia, while the absolute value of the difference between the conduction pulse width value T (n +1) at the next time and the conduction pulse width value Tn at the first time is less than the standard conduction pulse width difference ^ T, In-I (n +1) is less than or equal to Ia, and | T (n +1) -Tn | <T.
When the first power P1 and the second power P2 are determined not to be equal, continuing to heat the pot at the second power P2.
Determining that the difference between the second temperature value T2 and the first temperature value T1 is less than or equal to the dry-burning temperature difference threshold value v Ta, the pot is not in a dry-burning state, and continuing to heat the pot with first power P1;
acquiring a third temperature value T3 when the cookware is heated at the current moment at a second fixed time interval from the first moment;
determining that the third temperature value T3 is greater than or equal to a temperature value Tb corresponding to the overheating power Pb, and adjusting the first power P1 until the first power does not exceed the overheating power Pb;
continuing to heat the pot at the adjusted first power P1.
In the monitoring process, when the third temperature value T3 is determined to be greater than or equal to the upper limit value Tmax of the temperature value, the cookware is in a dry-burning state, and heating is stopped.
In practical applications, when the method for preventing dry-burning of a pot according to the embodiment of the present invention is used, the type of the pot heated by the electromagnetic heating device can be determined, and the embodiment only takes the detection of the ceramic pot as an example, and specifically includes:
before the first temperature value T1 of the sensor is obtained,
acquiring a preset voltage value Vc (volt (V)) of the electromagnetic cooker at the current moment and a preset current value Ic of the electromagnetic cooker at the current moment at a third fixed time interval in a preset detection time period, specifically, when a cooker is placed on a panel of an electromagnetic heating device and a heating switch is started, the electromagnetic heating device outputs a conducting pulse width Ton with a specific width, the preferred Ton is 20 microseconds (mu s), the preset detection time period is preferably 1 second(s), and the third fixed time interval is preferably 100 milliseconds (ms);
calculating a ceramic pan judgment threshold current value ^ I based on the front voltage value and the front current value, specifically, the ceramic pan judgment threshold current ^ I ^ E × Vc + F + G × Ton;
wherein G is a constant selectable value 0.24849, E is a constant selectable value 0.48286, F is a constant selectable value-106.087, and Ton is a constant selectable value within a selectable range of (10 μ s-30 μ s), and at this time, the corresponding numerical range of Ton in a micro control Unit (MCU Microcontroller Unit) is (260-; the value range of Vc can be selected (150V-280V), and at this time, the corresponding value range of Vc in the MCU is (106- > 198).
If the preposed current value is smaller than the ceramic pot judgment threshold current value, the method comprises the following steps: c & ltic & gt, judging that the current pot is a ceramic pot, and executing dry burning prevention judgment of the ceramic pot; and if Ic is more than or equal to I, judging that the current pot is a non-ceramic pot, and executing dry burning prevention judgment of the non-ceramic pot.
Fig. 2 is a schematic structural view of a device for preventing dry-cooking in a pot according to an embodiment of the present invention, as shown in fig. 2, the device for preventing dry-cooking in a pot according to an embodiment of the present invention includes:
a sensor module 201, configured to obtain a first temperature value T1 and a second temperature value T2 when the pot is heated;
the timing module 202 is used for recording the heating time of the cookware and judging whether the continuous heating of the cookware reaches the preset dry-burning judgment time;
a dry burning temperature difference threshold calculation module 203 for calculating a dry burning temperature difference threshold ∑ Ta based on the first temperature value T1; ta ═ C + A × Qm-T1 × B, wherein Qm is variable initial heating power (in Watts (W)), and Qm can be selected in a range (500W-800W), and correspondingly, T1 can be selected in a range (26 ℃ -48 ℃), and Ta can be selected in a range (35 ℃ -65 ℃); a is a constant selectable value 0.06742, B is a constant selectable value 0.9689, and C is a constant selectable value 42.23;
a dry-cooking determining module 204, configured to calculate a difference between the second temperature value T2 and the first temperature value T1, and determine whether the pot is in a dry-cooking state based on the difference and the dry-cooking temperature difference threshold ∑ Ta; specifically, if T2-T1 >. Ta; when the difference value is determined to be larger than the dry-burning temperature difference threshold value, the pot is in a dry-burning state, and heating of the pot is stopped;
the dry-fire determination module 204 is further configured to: sending a heating stopping instruction;
a power output module 205 for heating the pot; the method comprises the following steps: heating the pot at a first power P1, heating at an adjusted first power P1 and heating at a second power Pn;
the power output module 205 is further configured to: and receiving the heating stopping instruction, and stopping heating the cookware.
In practical application, the dry burning judgment module is further configured to: sending a continuous heating instruction;
the power output module is further configured to: receiving the continuous heating instruction, and heating the pot at a first power P1;
the device further comprises:
the working current obtaining module is used for obtaining a working current value In for heating the cookware at the current moment;
the power acquisition module is used for acquiring a value Pn of second power for heating the cooker at the current moment;
the conduction pulse width acquisition module is used for acquiring a conduction pulse width value Pn of the insulated gate bipolar transistor heated by the cookware at the current moment;
the dry-cooking determination module is further configured to determine whether the pot is In a dry-cooking state, specifically, whether the pot is In a dry-cooking state based on the working current value In, the standard current difference value ^ Ia, the value P1 of the first power, the value Pn of the second power, the conduction pulse width value Tn, and the standard conduction pulse width difference value ^ T
The power output module is further configured to: and receiving the continuous heating instruction, and heating the pot with second power Pn.
The sensor module is further configured to: acquiring a third temperature value T3 when the cookware is heated at a second fixed time interval from the beginning at the first moment;
the dry-burning judging module is further configured to judge whether the third temperature value T3 exceeds a temperature value Tb corresponding to the overheat power Pb, and send an adjustment instruction to the power output module when the third temperature value T3 exceeds the temperature value Tb corresponding to the overheat power Pb;
the power output module is further configured to: receiving the adjusting instruction, and continuing to heat the pot at the adjusted first power P1.
The dry-cooking determining module is further configured to determine whether the pot is in a dry-cooking state based on the upper temperature limit value Tmax and the third temperature value T3, specifically, in the monitoring process, when it is determined that the third temperature value T3 is greater than or equal to the upper temperature value Tmax, the pot is in the dry-cooking state, and heating is stopped;
in practical applications, when the device for preventing dry-cooking of a pot according to the embodiment of the present invention is used, the type of the pot heated by the electromagnetic heating device can be determined, and this embodiment only takes the detection of a ceramic pot as an example, and specifically, the device further includes:
the front voltage acquisition module is used for acquiring a front voltage value Vc heated by the cooker;
the front current acquisition module is used for acquiring a front current value Ic of the cooker heating;
the ceramic pot judgment threshold current calculation module is used for calculating a ceramic pot judgment threshold current value v I based on the front voltage value Vc and the front current value Ic; specifically, the ceramic pot judges that the threshold current ═ I ═ E × Vc + F + G × Ton;
wherein G is a constant selectable value 0.24849, E is a constant selectable value 0.48286, F is a constant selectable value-106.087, and Ton is a value within a selectable range of (10 μ s-30 μ s), and at this time, the corresponding value range of Ton in the MCU is (260-; the value range (150V-280V) of Vc can be selected, and at this time, the corresponding value range of Vc in the micro control unit MCU is (106-);
the pot judgment module is used for judging whether the current pot is a ceramic pot or not based on the front current value Ic and the ceramic pot judgment threshold current value ^ I; specifically, if the pre-current value is smaller than the ceramic pot judgment threshold current value, the method comprises the following steps: and (4) determining that the current cookware is ceramic cookware if Ic is less than or equal to ^ I, and determining that the current cookware is non-ceramic cookware if Ic is more than or equal to ^ I, and executing dry burning prevention determination of the non-ceramic cookware.
Fig. 3 is a schematic diagram illustrating an implementation process of the method for determining whether a pot is a ceramic pot in the embodiment of the present invention, and as shown in fig. 3, the implementation process of the method for determining whether a pot is a ceramic pot in the embodiment of the present invention includes the following steps:
step 301: acquiring a preset voltage value Vc of the electromagnetic cooker at the current moment at a third fixed time interval within a preset detection time period;
step 302: acquiring a front current value Ic of the electromagnetic cooker at the current moment at a third fixed time interval within a front detection time period;
step 303: calculating a ceramic pan judgment threshold current value ^ I based on the front voltage value and the front current value;
wherein ═ I ═ E × Vc + F + gxton;
wherein G is a constant selectable value 0.24849, E is a constant selectable value 0.48286, F is a constant selectable value-106.087, and Ton is a value within a selectable range of (10 μ s-30 μ s), and at this time, the corresponding value range of Ton in the MCU is (260-; the value range (150V-280V) of Vc can be selected, and at this time, the corresponding value range of Vc in the micro control unit MCU is (106-);
step 304: judging whether Ic < ^ I is established, if so, executing step 305, otherwise, executing step 306;
step 305: executing dry burning prevention judgment of the ceramic pot;
step 306: and executing dry burning prevention judgment of the non-ceramic pot.
Specifically, when the pot is placed on the electromagnetic heating device panel and the heating switch is activated, the electromagnetic heating device outputs an on pulse width Ton with a specific width, preferably Ton is 20 μ s, the preliminary detection time period is preferably 1s, and the third fixed time interval is preferably 100 ms.
Fig. 4 is a schematic diagram of an implementation process of a method for preventing dry-cooking of a pot in an embodiment of the present invention, which can determine whether a heating pot is a ceramic pot and monitor whether the ceramic pot is in a dry-cooking state, where the implementation process of the method for preventing dry-cooking of a pot in the embodiment includes:
step 401: acquiring a preset voltage value Vc of the electromagnetic cooker at the current moment at a third fixed time interval within a preset detection time period;
step 402: acquiring a front current value Ic of the electromagnetic cooker at the current moment at a third fixed time interval within a front detection time period;
step 403: calculating a ceramic pan judgment threshold current value ^ I based on the front voltage value and the front current value;
wherein ═ I ═ E × Vc + F + gxton;
wherein G is a constant selectable value 0.24849, E is a constant selectable value 0.48286, F is a constant selectable value-106.087, and Ton is a value within a selectable range of (10 μ s-30 μ s), and at this time, the corresponding value range of Ton in the MCU is (260-; the value range (150V-280V) of Vc can be selected, and at this time, the corresponding value range of Vc in the micro control unit MCU is (106-);
step 404: judging whether Ic < ^ I is established, if yes, executing step 405, and if not, executing step 406;
step 405: executing dry burning prevention judgment of the ceramic pot, and executing step 407;
step 406: executing dry burning prevention judgment of the non-ceramic pot, and starting heating of the pot;
step 407: when heating of a pot is started, a first temperature value T1 when the pot is heated is obtained;
step 408: when the cookware is continuously heated to the preset dry-burning judgment time, acquiring a second temperature value T2 when the cookware is heated;
step 409: calculating a dry-fire temperature difference threshold value based on the first temperature value;
the first temperature value calculates a dry burning temperature difference threshold Ta, Ta is C + A × Qm-T1 × B, wherein Qm is variable initial heating power, a value range (500W-800W) can be selected for Qm, a value range (26 ℃ -48 ℃) which is selected for T1 correspondingly, and a value range (35 ℃ -65 ℃) which is selected for Ta; a is a constant selectable value 0.06742, B is a constant selectable value 0.9689, and C is a constant selectable value 42.23;
step 410: calculating a difference value between the second temperature value and the first temperature value, and when the difference value is determined to be larger than the dry-burning temperature difference threshold value, the pot is in a dry-burning state, and heating of the pot is stopped;
specifically, if T2-T1 >. Ta; and when the difference value is determined to be larger than the dry-burning temperature difference threshold value, the pot is in a dry-burning state, and heating of the pot is stopped.
Fig. 5 is a schematic view of an implementation process of a method for preventing dry-cooking in a pot according to a second embodiment of the present invention, and as shown in fig. 5, the implementation process of the method for preventing dry-cooking in a pot according to the second embodiment of the present invention includes the following steps:
step 501: acquiring a preset voltage value Vc of the electromagnetic cooker at the current moment at a third fixed time interval within a preset detection time period;
step 502: acquiring a front current value Ic of the electromagnetic cooker at the current moment at a third fixed time interval within a front detection time period;
step 503: calculating a ceramic pan judgment threshold current value ^ I based on the front voltage value and the front current value;
specifically, ═ I ═ E × Vc + F + gxtton;
wherein, the optional value of G is 0.24849, the optional value of E is 0.48286, the optional value of F is-106.087, the optional range of Ton is (10 mus-30 mus), and at this time, the corresponding value range of Ton in the MCU is (260-; the value range (150V-280V) of Vc can be selected, and at this time, the corresponding value range of Vc in the micro control unit MCU is (106-);
step 504: judging whether Ic < ^ I is established, if so, executing step 505, otherwise, executing step 506;
step 505: executing dry burning prevention judgment of the ceramic pot;
step 506: executing dry burning prevention judgment of the non-ceramic pot;
step 507: when heating of a pot is started, a first temperature value T1 when the pot is heated is obtained;
step 508: when the cookware is continuously heated to the preset dry-burning judgment time, acquiring a second temperature value T2 when the cookware is heated;
step 509: calculating a dry-fire temperature difference threshold value based on the first temperature value;
the first temperature value calculates a dry burning temperature difference threshold value Ta, (-) Ta + A × Qm-T1 × B (wherein Qm is a variable related to the initial heating power P1, the Qm can be selected in a value range (500W-800W), correspondingly, the T1 can be selected in a value range (26 ℃ -48 ℃), the Ta can be selected in a value range (35 ℃ -65 ℃) A is a constant selectable value 0.06742, the B can be a constant selectable value 0.9689, and the C can be a constant selectable value 42.23;
step 510: calculating a difference value between the second temperature value and the first temperature value, and when the difference value is determined to be larger than the dry-burning temperature difference threshold value, the pot is in a dry-burning state, and heating of the pot is stopped;
specifically, if T2-T1 >. Ta; when the difference value is determined to be larger than the dry-burning temperature difference threshold value, the pot is in a dry-burning state, and heating of the pot is stopped;
step 511: determining that the difference value between the second temperature value and the first temperature value is less than or equal to the dry-burning temperature difference threshold value, and continuing to heat the pot with first power P1;
step 512: obtaining a working current value In of the heating of the cookware at the current moment at a first fixed time interval at the first moment;
step 513: obtaining a value Pn of a second power for heating the cooker at the current moment at a first fixed time interval at the first moment;
step 514: obtaining a conduction pulse width value Tn of an insulated gate bipolar transistor heated by the pot at the current moment;
step 515: when the first power P1 and the second power Pn are equal, determining In-I (n +1) > Ia and whether T (n +1) -Tn < > T is true, if yes, performing step 517, otherwise, performing step 516;
step 516: judging whether In-I (n +1) ≦ Ia and whether | T (n +1) -Tn | < ≦ T, if yes, executing step 517, and if not, returning to step 512;
517: when the first power P1 and the second power P2 are determined not to be equal, continuing to heat the pot at the second power P2;
step 518: acquiring a third temperature value T3 when the cookware is heated at the current moment at a second fixed time interval from the first moment;
step 519: determining that the third temperature value T3 is greater than or equal to a temperature value Tb corresponding to the overheating power Pb, and adjusting the first power P1 until the first power does not exceed the overheating power Pb;
step 520: and when the third temperature value T3 is determined to be greater than or equal to the upper temperature value Tmax, the pot is in a dry-cooking state, and heating is stopped.
Fig. 6 is a front view of an electromagnetic cooking utensil with a ceramic pot according to an embodiment of the present invention, as shown in fig. 6, the electromagnetic cooking utensil can use a black crystal panel, and the ceramic pot is placed on the black crystal panel when heating.
Fig. 7 is a top view of an electromagnetic cooker equipped with a device for preventing dry-cooking of a pot according to an embodiment of the present invention, and as shown in fig. 7, the electromagnetic cooker uses a black crystal panel, the black crystal panel mainly includes a heating area and an operating area, and when the electromagnetic cooker is heated, a ceramic pot is placed in the heating area.
Fig. 8 is a cross-sectional view of a ceramic pot used in the first embodiment of the present invention, wherein the pot wall of the ceramic pot is divided into two layers, and a metal film is installed between the two layers of pot walls.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for preventing dry burning of cookware is characterized by comprising the following steps:
when heating of a cooker is started, acquiring heating power at the moment as first power, and acquiring a first temperature value when the cooker is heated;
when the cookware is continuously heated to the preset dry-burning judgment time, acquiring a second temperature value when the cookware is heated;
calculating a dry-fire temperature difference threshold value based on the first temperature value;
calculating a difference value between the second temperature value and the first temperature value, and when the difference value is determined to be larger than the dry-burning temperature difference threshold value, the pot is in a dry-burning state, and heating of the pot is stopped; determining that the difference value between the second temperature value and the first temperature value is less than or equal to the dry-burning temperature difference threshold value, the pot is not in a dry-burning state, and continuing to heat the pot with first power; starting to acquire a third temperature value of the cooker at the current moment at a second fixed time interval at the first moment; determining that the third temperature value is greater than or equal to a temperature value corresponding to overheating power, and adjusting the first power until the first power does not exceed the overheating power; and continuing to heat the pot with the adjusted first power.
2. The method of claim 1, further comprising:
the following operations are performed at a first fixed time interval starting at a first time:
obtaining a working current value of the heating of the pot at the current moment;
obtaining a value of a second power for heating the pot at the current moment;
acquiring a conduction pulse width value of an insulated gate bipolar transistor heated by the pot at the current moment;
when the first power and the second power are equal, if one of the following conditions is met, the cooker is in a dry-burning state, and heating is stopped:
the difference value between the working current value at the first moment and the working current value at the next moment is greater than the standard current difference value, and meanwhile, the difference value between the conducting pulse width value at the next moment after the first moment and the conducting pulse width value at the first moment is smaller than the standard conducting pulse width difference value;
and the difference value between the working current value at the first moment and the working current value at the next moment is less than or equal to the standard current difference value, and the absolute value of the difference value between the conduction pulse width value at the next moment after the first moment and the conduction pulse width value at the first moment is less than the standard conduction pulse width difference value.
3. The method of claim 2, further comprising:
and when the first power and the second power are determined to be not equal, continuing to heat the cookware at the second power.
4. The method of claim 1, further comprising:
and determining that the third temperature value is greater than or equal to the upper limit value of the temperature value, and stopping heating when the cooker is in a dry-burning state.
5. The method of claim 1, further comprising:
before the first temperature value of the sensor is obtained,
acquiring a preposed voltage value of the electromagnetic cooker at the current moment and a preposed current value of the electromagnetic cooker at the current moment at a third fixed time interval within a preposed detection time period;
calculating a ceramic pot judgment threshold current value based on the preposed voltage value and the preposed current value;
if the preposed current value is smaller than the ceramic pot judgment threshold current value, judging that the current pot is a ceramic pot.
6. A device for preventing dry burning of cookware is characterized in that the device comprises:
the sensor module is used for acquiring a first temperature value and a second temperature value when the cooker is heated;
the sensor module is further configured to: acquiring a third temperature value of the cooker during heating at a second fixed time interval from the first moment;
the timing module is used for recording the heating time of the cookware and judging whether the continuous heating of the cookware reaches the preset dry-burning judgment time;
the dry-burning temperature difference threshold value calculating module is used for calculating a dry-burning temperature difference threshold value based on the first temperature value;
the dry-burning judging module is used for calculating a difference value between the second temperature value and the first temperature value and judging whether the cooker is in a dry-burning state or not based on the difference value and the dry-burning temperature difference threshold value;
the dry burning judgment module is also used for: sending a heating stopping instruction;
the dry burning judgment module is further used for judging whether the third temperature value exceeds a temperature value corresponding to the overheating power, and sending an adjustment instruction to the power output module when the third temperature value exceeds the temperature value corresponding to the overheating power;
the power output module is used for heating the cookware;
the power output module is further configured to: receiving the heating stopping instruction, and stopping heating the cookware;
the power output module is further configured to: and receiving the adjusting instruction, and continuing to heat the cooker with the adjusted first power.
7. The apparatus of claim 6,
the dry burning judgment module is also used for: sending a continuous heating instruction;
the power output module is further configured to: receiving the continuous heating instruction, and heating the cooker with first power;
the device further comprises:
the working current obtaining module is used for obtaining the working current value of the heating of the cooker at the current moment;
the power acquisition module is used for acquiring a value of second power for heating the cooker at the current moment;
the conduction pulse width acquisition module is used for acquiring a conduction pulse width value of the insulated gate bipolar transistor heated by the cookware at the current moment;
the dry-cooking judging module is further configured to judge whether the cooker is in a dry-cooking state or not based on the working current value, a standard current difference value, the value of the first power, the value of the second power, the conduction pulse width value and a standard conduction pulse width difference value.
8. The apparatus of claim 7,
the power output module is further configured to: and receiving the continuous heating instruction, and heating the pot with second power.
9. The apparatus of claim 7, further comprising:
the dry-cooking judging module is further used for judging whether the cookware is in a dry-cooking state or not based on the upper temperature limit value and the third temperature value.
10. The apparatus of claim 6, further comprising:
the front voltage acquisition module is used for acquiring a front voltage value of the cooker heating;
the preposed current acquisition module is used for acquiring a preposed current value of the cooker heating;
the ceramic pot judgment threshold current calculation module is used for calculating a ceramic pot judgment threshold current value based on the preposed voltage value and the preposed current value;
and the cooker judgment module is used for judging whether the current cooker is the ceramic cooker or not based on the preposed current value and the ceramic cooker judgment threshold current value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710351993.0A CN108966390B (en) | 2017-05-18 | 2017-05-18 | Method and device for preventing cookware from being burnt dry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710351993.0A CN108966390B (en) | 2017-05-18 | 2017-05-18 | Method and device for preventing cookware from being burnt dry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108966390A CN108966390A (en) | 2018-12-07 |
| CN108966390B true CN108966390B (en) | 2021-03-23 |
Family
ID=64461424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710351993.0A Active CN108966390B (en) | 2017-05-18 | 2017-05-18 | Method and device for preventing cookware from being burnt dry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108966390B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113133636B (en) * | 2020-01-17 | 2022-12-06 | 九阳股份有限公司 | Dry burning prevention detection method for cooking appliance and cooking appliance |
| CN111343736B (en) * | 2020-03-12 | 2022-04-08 | 沈闽江 | Immersion type thick film liquid heater and electronic dry burning prevention method thereof |
| CN111728493B (en) * | 2020-05-29 | 2022-10-04 | 九阳股份有限公司 | Heating control method for electric steamer and electric steamer |
| CN114532861B (en) * | 2020-11-27 | 2023-09-01 | 杭州九阳小家电有限公司 | Food processor and dry heating prevention control method thereof |
| CN113080525A (en) * | 2021-03-17 | 2021-07-09 | 深圳麦克韦尔科技有限公司 | Aerosol generating device, dry burning detection method and computer program product |
| CN115128696A (en) * | 2022-06-29 | 2022-09-30 | 厦门艾美森新材料科技股份有限公司 | Air cushion machine film-free monitoring method and air cushion machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104066211A (en) * | 2013-03-19 | 2014-09-24 | 美的集团股份有限公司 | Electric heater with dry-burning identification function and dry-burning identification method thereof |
| CN106211395A (en) * | 2016-07-15 | 2016-12-07 | 珠海格力电器股份有限公司 | Heating control method of electromagnetic heating device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499358A (en) * | 1984-03-27 | 1985-02-12 | The Mead Corporation | Driving circuit for radio frequency dryer |
| JP4162577B2 (en) * | 2003-11-25 | 2008-10-08 | 株式会社東芝 | Cooker and cooking utensil used for the cooker |
| US7626463B2 (en) * | 2006-08-25 | 2009-12-01 | Ameritherm, Inc. | Automatic frequency compensation for pulse width modulated RF level control |
| ES2339087B1 (en) * | 2008-02-22 | 2011-03-28 | Bsh Electrodomesticos España, S.A. | COOKING FIELD BY INDUCTION WITH AT LEAST ONE HEATING ELEMENT BY INDUCTION AND AT LEAST ONE TEMPERATURE SENSOR. |
| CN102149982B (en) * | 2008-09-09 | 2014-12-31 | 林一峰 | Heating control device and method thereof |
| CN102711301B (en) * | 2011-03-28 | 2015-07-08 | 株式会社东芝 | Induction heating cooker |
| CN104684123B (en) * | 2015-01-23 | 2016-07-06 | 九阳股份有限公司 | A kind of control method of electromagnetic oven |
| CN206149527U (en) * | 2016-11-21 | 2017-05-03 | 佛山市顺德区美的电热电器制造有限公司 | Detect system and electromagnetic heating kitchen utensils and appliances of electromagnetic heating pot utensil temperature |
-
2017
- 2017-05-18 CN CN201710351993.0A patent/CN108966390B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104066211A (en) * | 2013-03-19 | 2014-09-24 | 美的集团股份有限公司 | Electric heater with dry-burning identification function and dry-burning identification method thereof |
| CN106211395A (en) * | 2016-07-15 | 2016-12-07 | 珠海格力电器股份有限公司 | Heating control method of electromagnetic heating device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108966390A (en) | 2018-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108966390B (en) | Method and device for preventing cookware from being burnt dry | |
| CN103263224B (en) | Electric heating device, electric cooker and wireless temperature control method | |
| CN102949081B (en) | Heating control method for electrical cooking appliance | |
| CN108567311B (en) | Dry heating prevention method and device for cooking utensil and cooking system | |
| CN105444213B (en) | The method for heating and controlling of pan | |
| CN101637354B (en) | Electromagnetic rice cooker | |
| CN101307924B (en) | Electromagnetic oven with magnetic induction temperature measuring device | |
| CN104083078B (en) | The control method of electric pressure cooking saucepan, control device and electric pressure cooking saucepan | |
| CN108652433A (en) | Method for cooking rice and electromagnetic heating cooking appliance | |
| JPH0316572B2 (en) | ||
| JP2012502410A (en) | Heating control device and heating control method | |
| CN105342363B (en) | A kind of cooking apparatus and its temperature control method | |
| CN105816058B (en) | The heating means of baking machine, the heating device of baking machine and baking machine | |
| CN107616698A (en) | Porridge-cooking control method and cooker | |
| CN104807050A (en) | Microwave heating control system, microwave heating control method and microwave oven | |
| CN106788358B (en) | IGBT overheating protection method and device and electrical equipment | |
| CN107638090A (en) | Baking machine and its method for heating and controlling | |
| CN108731043B (en) | The method for heating and controlling and device of electromagnetic oven | |
| CN109393943A (en) | A kind of cook's machine and its control method | |
| CN110319464B (en) | System, method and device for preventing overheating of pot temperature | |
| CN204797626U (en) | A heating circuit and oven for oven | |
| CN108709204B (en) | Empty pot detection method for induction cooker | |
| US6888110B2 (en) | Method and device for detecting heating processes | |
| CN106705146A (en) | Electric heating furnace capable of intelligently switching heating modes | |
| CN109429399A (en) | The control method and device of cookware anti-dry, electromagnetic oven |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |