CN108966390A - A kind of method and device preventing boilers from drying burning - Google Patents
A kind of method and device preventing boilers from drying burning Download PDFInfo
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- CN108966390A CN108966390A CN201710351993.0A CN201710351993A CN108966390A CN 108966390 A CN108966390 A CN 108966390A CN 201710351993 A CN201710351993 A CN 201710351993A CN 108966390 A CN108966390 A CN 108966390A
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- cookware
- value
- heating
- power
- temperature value
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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
Abstract
The invention discloses a kind of methods for preventing boilers from drying burning, comprising: when starting the heating to cookware, obtains the first temperature value when cookware heating；When the cookware is heated continuously default dry combustion method and judges the time, second temperature value when cookware heating is obtained；Dry combustion method temperature difference threshold is calculated based on first temperature value；The difference for calculating the second temperature value Yu first temperature value, when determining that the difference is greater than the dry combustion method temperature difference threshold, the cookware is in dry-fire condition, stops the heating to cookware.The invention also discloses the devices that a kind prevents boilers from drying burning.
Description
Technical field
The present invention relates to the electromagnetic heating technique of electronic field, especially a kind of method and device for preventing boilers from drying burning.
Background technique
In the prior art, when heating using electromagnetic kitchen range to cookware, often face what the water in cookware dryouied
Situation, when carrying out dry combustion method to anhydrous cookware, cookware bottom temp is rapidly more than 500 degrees Celsius, so that cookware is burst, destroys pot
Tool and electromagnetic kitchen range, existing electromagnetic kitchen range lack the detection that dry-fire condition whether is in cookware, are unfavorable for safe handling electricity
Magnetic kitchen range.
Summary of the invention
In view of this, present invention contemplates that provide a kind of method and device for preventing boilers from drying burning, can accurate judgement
Whether the cookware of heating is in dry-fire condition, and stops heating to the cookware in dry-fire condition in time.
In order to achieve the above objectives, the technical solution of the embodiment of the present invention is achieved in that
The embodiment of the invention provides a kind of methods for preventing boilers from drying burning, comprising:
When starting the heating to cookware, the first temperature value when cookware heating is obtained；
When the cookware is heated continuously default dry combustion method and judges the time, second temperature when cookware heating is obtained
Value；
Dry combustion method temperature difference threshold is calculated based on first temperature value；
The difference for calculating the second temperature value Yu first temperature value determines that the difference is greater than the dry combustion method temperature difference
When threshold value, the cookware is in dry-fire condition, stops the heating to cookware.
In above scheme, the method also includes:
When determining that the difference of the second temperature value and first temperature value is less than or equal to the dry combustion method temperature difference threshold, institute
It states cookware and is not in dry-fire condition, continue to heat cookware with the first power；
Start to execute following operation with the first Fixed Time Interval at the first moment:
Obtain the working current value of the heating of cookware described in current time；
Obtain the value of the second power of the heating of cookware described in current time；
Obtain the conducting pwm value of the insulated gate bipolar transistor of the heating of cookware described in current time；
In first power and equal second power, if meeting one of the following conditions, the cookware is in
Dry-fire condition stops heating:
The working current value at first moment therewith the working current value at the latter moment difference be greater than normalized current
Difference, meanwhile, the difference of the conducting pwm value of the conducting pwm value and first moment at the latter moment at first moment
Value is less than standard and pulsewidth difference is connected；
The difference of the working current value at first moment working current value at the latter moment therewith is less than or equal to described
Normalized current difference, while the conducting pulsewidth of the conducting pwm value and first moment at the latter moment at first moment
The absolute value of the difference of value is less than the standard and pulsewidth difference is connected.
In above scheme, the method also includes:
When determining first power and unequal second power, continue to heat the pot with second power
Tool.
In above scheme, the method also includes:
Determine that the difference of the second temperature value and first temperature value is less than or equal to the dry combustion method temperature difference threshold, it is described
Cookware is not in dry-fire condition, continues to heat the cookware with the first power；
Start third temperature when obtaining the heating of cookware described in current time with the second Fixed Time Interval at the first moment
Value；
It determines that the third temperature value was more than or equal to the corresponding temperature value of thermal power, adjusts first power, until
First power crosses thermal power no more than described；
Continue to heat the cookware with the first power being adjusted.
In above scheme, the method also includes:
Determine that the third temperature value is more than or equal to temperature value upper limit value, the cookware is in dry-fire condition, stops heating.
In above scheme, the method also includes:
Before first temperature value for obtaining sensor,
The forward voltage value at electromagnetic kitchen range current time is obtained with third Fixed Time Interval in preposition detection time section
With the preposition current value at the electromagnetic kitchen range current time；
Ceramic pan judgment threshold current value is calculated based on the forward voltage value and preposition current value；
If the preposition current value is less than the ceramic pan judgment threshold current value, judge current cookware for ceramic pan
Tool.
The embodiment of the invention also provides a kind of devices for preventing boilers from drying burning, comprising:
Sensor module, for obtaining the first temperature value and second temperature value when the cookware heats；
Timing module, for recording the heating time to the cookware, and judge to the continuous heating of the cookware whether
Reach default dry combustion method and judges the time；
Dry combustion method temperature difference threshold computing module, for calculating dry combustion method temperature difference threshold based on first temperature value；
Dry combustion method judgment module is based on the difference for calculating the difference of the second temperature value Yu first temperature value
Value and the dry combustion method temperature difference threshold judge whether the cookware is in dry-fire condition；
The dry combustion method judgment module is also used to: being issued and is stopped heating instructions；
Power output module, for being heated to the cookware；
The power output module is also used to: being received the stopping heating instructions, is stopped heating the cookware.
In above scheme,
The dry combustion method judgment module is also used to: being issued and is continued heating instructions；
The power output module is also used to: being received the continuation heating instructions, is heated the cookware with the first power；
Described device further include:
Operating current obtains module, for obtaining the working current value of the heating of cookware described in current time；
Power acquisition module, the value of the second power for obtaining the heating of cookware described in current time；
Pulsewidth is connected and obtains module, the insulated gate bipolar transistor for obtaining the heating of cookware described in current time is led
It promotes blood circulation width values；
The dry combustion method judgment module is also used to based on the working current value, normalized current difference, first power
Value, the value of second power, the conducting pwm value and standard conducting pulsewidth difference judge whether the cookware is in dry combustion method
State.
In above scheme,
The power output module is also used to: being received the continuation heating instructions, is heated the cookware with the second power.
In above scheme,
The sensor module is also used to: starting to obtain the cookware heating with the second Fixed Time Interval at the first moment
When third temperature value；
The dry combustion method judgment module is also used to judge whether the third temperature value was more than the corresponding temperature of thermal power
Value, and the third temperature value be more than it is described cross thermal power corresponding temperature value when send adjustment to power output module and refer to
It enables；
The power output module is also used to: being received the adjustment instruction, is continued the first power heating to be adjusted
The cookware.
In above scheme, described device further include:
The dry combustion method judgment module is also used to judge whether the cookware is in based on temperature upper limit and third temperature value
Dry-fire condition.
In above scheme, described device further include:
Forward voltage obtains module, for obtaining the forward voltage value of the cookware heating；
Preposition electric current obtains module, for obtaining the preposition current value of the cookware heating；
Ceramic pan judgment threshold current calculation module, for calculating ceramics based on the forward voltage value and preposition current value
Pot judgment threshold current value；
Cookware judgment module, for current based on the preposition current value and ceramic pan judgment threshold current value judgement
Whether cookware is ceramic cooker.
What is provided through the invention prevents the method and device of boilers from drying burning, can find the pot in dry-fire condition in time
Tool, and stop that the cookware of dry-fire condition out is continued to heat, it avoids cookware and crosses thermal breakage damage cookware and electromagnetic kitchen range, improve
User experience.
The embodiment of the present invention can be directly realized by the detection to cookware, not need to limit use environment, and realization is simple and convenient,
The scope of application is wider, while improving the experience of user.
Detailed description of the invention
Fig. 1 is the realization process schematic that the method for boilers from drying burning is prevented in the embodiment of the present invention；
Fig. 2 is the apparatus structure schematic diagram that boilers from drying burning is prevented in the embodiment of the present invention；
Fig. 3 be judge in the embodiment of the present invention cookware whether be ceramic pan method realization process schematic；
Fig. 4 is the realization process schematic that the method for boilers from drying burning is prevented in the embodiment of the present invention one；
Fig. 5 is the realization process schematic that the method for boilers from drying burning is prevented in the embodiment of the present invention two；
Fig. 6 is the main view of the electromagnetic kitchen range in the embodiment of the present invention one with ceramic pan；
Fig. 7 is to be equipped with the top view for preventing the electromagnetic kitchen range of boilers from drying burning device in the embodiment of the present invention one；
Fig. 8 is the sectional view of ceramic pan used in the embodiment of the present invention one.
Specific embodiment
The characteristics of in order to more fully hereinafter understand the embodiment of the present invention and technology contents, with reference to the accompanying drawing to this hair
The realization of bright embodiment is described in detail, appended attached drawing purposes of discussion only for reference, is not used to limit the present invention.
In record of the embodiment of the present invention, it should be noted that unless otherwise indicated and limit, term " connection " should be done extensively
Reason and good sense solution, for example, it may be electrical connection, the connection being also possible to inside two elements can be directly connected, can also pass through
Intermediary is indirectly connected, and for the ordinary skill in the art, can understand above-mentioned term as the case may be
Concrete meaning.
It should be noted that term involved in the embodiment of the present invention " first second third " be only be that difference is similar
Object, do not represent the particular sorted for object, it is possible to understand that ground, " Yi Er third " can be in the case where permission
Exchange specific sequence or precedence.It should be understood that the object that " first second third " is distinguished in the appropriate case can be mutual
It changes, so that the embodiment of the present invention described herein can be real with the sequence other than those of illustrating or describing herein
It applies.
Before the present invention will be described in further detail, noun involved in the embodiment of the present invention and term are said
Bright, noun involved in the embodiment of the present invention and term are suitable for following explanation.
Electromagnetic heater: converting electrical energy into the device of thermal energy using electromagnetic induction principle, including but not limited to: electromagnetism
Furnace, electromagnetic stove and electromagnetic heater.
First temperature value, second temperature value, third temperature value: three is by the sensor measurement in electromagnetic heater
It obtains, when being heated due to electromagnetic heater to cookware, the bottom of the panel of cookware bottom and electromagnetic heater is tight
Contiguity touching, it can be considered that first temperature value, second temperature value and the third temperature value are temperature when cookware heats
Degree.
Fig. 1 is the realization process schematic that the method for boilers from drying burning is prevented in the embodiment of the present invention, as shown in Figure 1, this hair
The realization process of the method for boilers from drying burning is prevented in bright embodiment the following steps are included:
Step 101: when starting the heating to cookware, obtaining the first temperature value when cookware heating；
Step 102: when the cookware is heated continuously default dry combustion method and judges the time, when obtaining cookware heating the
Two temperature values；
Step 103: dry combustion method temperature difference threshold is calculated based on first temperature value；
Step 104: calculating the difference of the second temperature value Yu first temperature value, it is described to determine that the difference is greater than
When dry combustion method temperature difference threshold, the cookware is in dry-fire condition, stops the heating to cookware.
In practical application, when heating to cookware, the quantity of the sensor in electromagnetic kitchen range is preferably electromagnetic kitchen range
Two, wherein -20 DEG C~125 DEG C of the preferred temperature-measuring range of first sensor, the first sensor is at 20 DEG C~100 DEG C
Temperature curve and slope are preferable, and thermometric is calibrated；Second sensor, -20 DEG C of temperature-measuring range~250 DEG C, the temperature at 80 DEG C~160 DEG C
Write music line and slope it is preferable, thermometric is calibrated.
When starting the heating to cookware, heating power is the first heating power P1 at this time, is obtained when the cookware heats
First temperature value T1；
When the cookware is heated continuously default dry combustion method and judges the time, second temperature value when cookware heating is obtained
T2, the default dry combustion method judge when the time preferably 5 minutes；
Based on first temperature value calculate dry combustion method temperature difference threshold ▽ Ta, ▽ Ta=C+A × Qm-T1 × B, wherein Qm be can
Becoming initial heating power, the optional value range of Qm (500W-800W) is corresponding, the optional value range of T1 (26 DEG C -48 DEG C),
The optional value range of ▽ Ta (35 DEG C -65 DEG C) A be constant can selected value 0.06742, B be constant can selected value 0.9689, C is
Constant optional 42.23；
The difference for calculating the second temperature value Yu first temperature value determines that the difference is greater than the dry combustion method temperature difference
When threshold value, it may be assumed that T2-T1 > ▽ Ta；, the cookware is in dry-fire condition, stops the heating to cookware.
In practical application, the method for preventing boilers from drying burning further include: determine the second temperature value and described first
The difference of temperature value is less than or equal to the dry combustion method temperature difference threshold, it may be assumed that and when T2-T1≤▽ Ta, the cookware is not in dry-fire condition,
Continue to heat cookware with the first power P 1；
When electromagnetic kitchen range continues to heat cookware with the first power P 1, when the first moment started fixed with first
Between interval execute following operation:
Obtain the working current value In of the heating of cookware described in current time；
Obtain the value Pn of the second power of the heating of cookware described in current time；
Obtain the conducting pwm value Tn of the insulated gate bipolar transistor of the heating of cookware described in current time；
When first power P 1 is equal with the second power P n, if meeting one of the following conditions, the cookware
In dry-fire condition, stop heating:
The difference of the working current value In at first moment working current value I (n+1) at the latter moment therewith is greater than
Normalized current difference ▽ Ia, meanwhile, when the conducting pwm value T (n+1) at the latter moment at first moment is with described first
The difference of the conducting pwm value Tn at quarter is less than standard and pulsewidth difference ▽ T is connected, it may be assumed that In-I (n+1) > ▽ Ia, while T (n+1)-
Tn < ▽ T；
The difference I (n+1) of the working current value In at first moment working current value at the latter moment therewith is less than
Equal to the normalized current difference ▽ Ia, at the same the conducting pwm value T (n+1) at the latter moment at first moment with it is described
The absolute value of the difference of the conducting pwm value Tn at the first moment is less than the standard and pulsewidth difference ▽ T, In-I (n+1)≤▽ is connected
Ia, simultaneously | T (n+1)-Tn | < ▽ T.
When determining first power P 1 and unequal second power P 2, continue to heat institute with second power P 2
State cookware.
Determine that the difference of the second temperature value T2 and the first temperature value T1 is less than or equal to the dry combustion method temperature difference threshold
▽ Ta, the cookware are not in dry-fire condition, continue to heat the cookware with the first power P 1；
Start third temperature when obtaining the heating of cookware described in current time with the second Fixed Time Interval at the first moment
Value T3；
It determines that the third temperature value T3 is more than or equal to the corresponding temperature value Tb of overheat power P b, adjusts first power
P1, until first power is no more than the overheat power P b；
Continue to heat the cookware with the first power P 1 being adjusted.
During monitoring, when determining that the third temperature value T3 is more than or equal to temperature value upper limit value Tmax, at the cookware
In dry-fire condition, stop heating.
In practical application, using the embodiment of the present invention the method for preventing boilers from drying burning when, can also judge to utilize electromagnetism
The type for the cookware that heating device is heated, the present embodiment are only illustrated by taking the detection to ceramic cooker as an example, specific to wrap
It includes:
Before the first temperature value T1 for obtaining sensor,
The preposition electricity at the electromagnetic kitchen range current time is obtained with third Fixed Time Interval in preposition detection time section
The preposition current value Ic of pressure value Vc (volt (V)) and the electromagnetic kitchen range current time, specifically, when cookware is placed on electromagnetic heating
When on device panel and starting heater switch, electromagnetic heater exports the conducting pulsewidth Ton of a specific width, preferably
Ton be 20 microseconds (μ s), the preposition detection time section preferably 1 second (s), preferably 100 milliseconds of the third Fixed Time Interval
(ms)；
Ceramic pan judgment threshold current value ▽ I is calculated based on the forward voltage value and preposition current value, specifically, ceramic
Pot judgment threshold electric current ▽ I=E × Vc+F+G × Ton；
Wherein, G be constant can selected value be 0.24849, E be constant can selected value be 0.48286, F be constant can choose
Value is that the optional range of -106.087, Ton value is (10 μ s-30 μ s), at this point, the Ton is in micro-control unit (MCU
Microcontroller Unit) in corresponding numberical range be (260-610)；The optional value range of Vc (150V-280V),
At this point, the Vc corresponding numberical range in micro-control unit MCU is (106-198).
If the preposition current value is less than the ceramic pan judgment threshold current value i.e.: Ic < ▽ I judges current cookware
For ceramic cooker, the anti-dry judgement of ceramic cooker is executed；If Ic >=▽ I, judge that current cookware for non-ceramic cookware, executes
The anti-dry of non-ceramic cookware judges.
Fig. 2 is the apparatus structure schematic diagram that boilers from drying burning is prevented in the embodiment of the present invention, as shown in Fig. 2, the present invention is implemented
Prevent the apparatus structure of boilers from drying burning from including: in example
Sensor module 201, for obtaining the first temperature value T1 and second temperature value T2 when cookware heating；
Timing module 202 for recording the heating time to the cookware, and judges that the continuous heating to the cookware is
It is no to reach default dry combustion method and judge the time；
Dry combustion method temperature difference threshold computing module 203, for calculating dry combustion method temperature difference threshold ▽ Ta based on the first temperature value T1；
▽ Ta=C+A × Qm-T1 × B, wherein Qm is variable initial heating power (unit watt (W)), the optional value range of Qm
(500W-800W), corresponding, the optional value range of T1 (26 DEG C -48 DEG C), the optional value range of ▽ Ta (35 DEG C -65 DEG C)；
A be constant can selected value 0.06742, B be constant can selected value 0.9689, C is constant optional 42.23；
Dry combustion method judgment module 204 is based on for calculating the difference of the second temperature value T2 Yu the first temperature value T1
The difference and the dry combustion method temperature difference threshold ▽ Ta judge whether the cookware is in dry-fire condition；Specifically, if T2-T1 >
▽Ta；When determining that the difference is greater than the dry combustion method temperature difference threshold, the cookware is in dry-fire condition, and stopping adds cookware
Heat；
The dry combustion method judgment module 204 is also used to: being issued and is stopped heating instructions；
Power output module 205, for being heated to the cookware；Include: with the first power P 1 to the cookware into
Row heating is carried out heating with the first power P 1 being adjusted and is heated with the second power P n；
The power output module 205 is also used to: being received the stopping heating instructions, is stopped heating the cookware.
In practical application, the dry combustion method judgment module is also used to: being issued and is continued heating instructions；
The power output module is also used to: being received the continuation heating instructions, is heated the cookware with the first power P 1；
Described device further include:
Operating current obtains module, for obtaining the working current value In of the heating of cookware described in current time；
Power acquisition module, the value Pn of the second power for obtaining the heating of cookware described in current time；
Pulsewidth is connected and obtains module, the insulated gate bipolar transistor for obtaining the heating of cookware described in current time is led
Width values of promoting blood circulation Pn；
The dry combustion method judgment module is also used to based on the working current value In, normalized current difference ▽ Ia, described first
The value P1 of power, the value Pn of second power, the conducting pwm value Tn and standard conducting pulsewidth difference ▽ T judge the pot
Whether tool is in dry-fire condition, specifically
The power output module is also used to: being received the continuation heating instructions, is heated the cookware with the second power P n.
The sensor module is also used to: starting to obtain the cookware heating with the second Fixed Time Interval at the first moment
When third temperature value T3；
The dry combustion method judgment module is also used to judge whether the third temperature value T3 is more than the corresponding temperature of overheat power P b
Angle value Tb, and sent out when the third temperature value T3 is more than the corresponding temperature value Tb of the overheat power P b to power output module
Send adjustment instruction；
The power output module is also used to: being received the adjustment instruction, is continued to add with the first power P 1 being adjusted
The heat cookware.
The dry combustion method judgment module is also used to judge the pot based on the temperature upper limit Tmax and third temperature value T3
Whether tool is in dry-fire condition, specifically, determining that the third temperature value T3 is more than or equal to temperature value upper limit value during monitoring
When Tmax, the cookware is in dry-fire condition, stops heating；
In practical application, using the embodiment of the present invention the device for preventing boilers from drying burning when, can also judge to utilize electromagnetism
The type for the cookware that heating device is heated, the present embodiment are only illustrated by taking the detection to ceramic cooker as an example, specifically,
Described device further include:
Forward voltage obtains module, for obtaining the forward voltage value Vc of the cookware heating；
Preposition electric current obtains module, for obtaining the preposition current value Ic of the cookware heating；
Ceramic pan judgment threshold current calculation module, for being calculated based on the forward voltage value Vc and preposition current value Ic
Ceramic pan judgment threshold current value ▽ I；Specifically, ceramic pan judgment threshold electric current ▽ I=E × Vc+F+G × Ton；
Wherein, G be constant can selected value be 0.24849, E be constant can selected value be 0.48286, F be constant can choose
Value is that the optional range of -106.087, Ton value is (10 μ s-30 μ s), at this point, the Ton is corresponding in micro-control unit MCU
Numberical range is (260-610)；The optional value range of Vc (150V-280V), at this point, the Vc is in micro-control unit MCU
Corresponding numberical range is (106-198)；
Cookware judgment module, for being sentenced based on the preposition current value Ic and ceramic pan judgment threshold current value ▽ I
Whether the current cookware that breaks is ceramic cooker；Specifically, if the preposition current value is less than the ceramic pan judgment threshold electric current
Be worth i.e.: Ic < ▽ I judges current cookware for ceramic cooker, if Ic >=▽ I, judges that current cookware for non-ceramic cookware, executes
The anti-dry of non-ceramic cookware judges.
Fig. 3 be judge in the embodiment of the present invention cookware whether be ceramic pan method realization process schematic, such as Fig. 3 institute
Show, judge in the embodiment of the present invention cookware whether be ceramic pan method realization process the following steps are included:
Step 301: the electromagnetic kitchen range current time being obtained with third Fixed Time Interval in preposition detection time section
Forward voltage value Vc；
Step 302: the electromagnetic kitchen range current time being obtained with third Fixed Time Interval in preposition detection time section
Preposition current value Ic；
Step 303: ceramic pan judgment threshold current value ▽ I is calculated based on the forward voltage value and preposition current value；
Wherein ▽ I=E × Vc+F+G × Ton；
Wherein, G be constant can selected value be 0.24849, E be constant can selected value be 0.48286, F be constant can choose
Value is that the optional range of -106.087, Ton value is (10 μ s-30 μ s), at this point, the Ton is corresponding in micro-control unit MCU
Numberical range is (260-610)；The optional value range of Vc (150V-280V), at this point, the Vc is in micro-control unit MCU
Corresponding numberical range is (106-198)；
Step 304: judging whether Ic < ▽ I is true, if set up, execute step 305, otherwise, execute step 306；
Step 305: executing the anti-dry judgement of ceramic cooker；
Step 306: executing the anti-dry judgement of non-ceramic cookware.
Specifically, when cookware is placed on electromagnetic heater panel and starts heater switch, electromagnetic heater output
Conducting the pulsewidth Ton, preferred Ton of one specific width are 20 μ s, the preposition preferred 1s of detection time section, and the third is solid
It fixes time and is spaced preferred 100ms, it should be noted that the embodiment of the present invention only illustrates by taking ceramic pan as an example to by preposition electric current
Value is compared with judgment threshold current value judges cookware type.
Fig. 4 is the realization process schematic that the method for boilers from drying burning is prevented in the embodiment of the present invention one, passes through embodiment one
It may be implemented to judge to heat whether cookware is ceramic cooker, and whether ceramic cooker be monitored in dry-fire condition, implement
Prevented in example one method of boilers from drying burning the realization process includes:
Step 401: the electromagnetic kitchen range current time being obtained with third Fixed Time Interval in preposition detection time section
Forward voltage value Vc；
Step 402: the electromagnetic kitchen range current time being obtained with third Fixed Time Interval in preposition detection time section
Preposition current value Ic；
Step 403: ceramic pan judgment threshold current value ▽ I is calculated based on the forward voltage value and preposition current value；
Wherein, ▽ I=E × Vc+F+G × Ton；
Wherein, G be constant can selected value be 0.24849, E be constant can selected value be 0.48286, F be constant can choose
Value is that the optional range of -106.087, Ton value is (10 μ s-30 μ s), at this point, the Ton is corresponding in micro-control unit MCU
Numberical range is (260-610)；The optional value range of Vc (150V-280V), at this point, the Vc is in micro-control unit MCU
Corresponding numberical range is (106-198)；
Step 404: judging whether Ic < ▽ I is true, if set up, execute step 405, otherwise, execute step 406；
Step 405: executing the anti-dry judgement of ceramic cooker, execute step 407；
Step 406: executing the anti-dry judgement of non-ceramic cookware, start the heating to cookware；
Step 407: when starting the heating to cookware, obtaining the first temperature value T1 when cookware heating；
Step 408: when the cookware is heated continuously default dry combustion method and judges the time, when obtaining cookware heating the
Two temperature value T2；
Step 409: dry combustion method temperature difference threshold is calculated based on first temperature value；
Wherein, first temperature value calculates dry combustion method temperature difference threshold ▽ Ta, ▽ Ta=C+A × Qm-T1 × B, and wherein Qm is
Variable initial heating power, the optional value range of Qm (500W-800W) is corresponding, (26 DEG C -48 of the optional value range of T1
DEG C), the optional value range of ▽ Ta (35 DEG C -65 DEG C)；A be constant can selected value 0.06742, B be that constant can selected value
0.9689, C is constant optional 42.23；
Step 410: calculating the difference of the second temperature value Yu first temperature value, it is described to determine that the difference is greater than
When dry combustion method temperature difference threshold, the cookware is in dry-fire condition, stops the heating to cookware；
Specifically, if T2-T1 > ▽ Ta；When determining that the difference is greater than the dry combustion method temperature difference threshold, at the cookware
In dry-fire condition, stop the heating to cookware.
Fig. 5 is the realization process schematic that the method for boilers from drying burning is prevented in the embodiment of the present invention two, as shown in figure 5, this
The realization process of the method for boilers from drying burning is prevented in inventive embodiments two the following steps are included:
Step 501: the electromagnetic kitchen range current time being obtained with third Fixed Time Interval in preposition detection time section
Forward voltage value Vc；
Step 502: the electromagnetic kitchen range current time being obtained with third Fixed Time Interval in preposition detection time section
Preposition current value Ic；
Step 503: ceramic pan judgment threshold current value ▽ I is calculated based on the forward voltage value and preposition current value；
Specifically, ▽ I=E × Vc+F+G × Ton；
Wherein, G can selected value be 0.24849, E can selected value be 0.48286, F can selected value be that -106.087, Ton takes
Being worth optional range is (10 μ s-30 μ s), at this point, the Ton corresponding numberical range in micro-control unit MCU is (260-
610)；The optional value range of Vc (150V-280V), at this point, the Vc corresponding numberical range in micro-control unit MCU is
(106-198)；
Step 504: judging whether Ic < ▽ I is true, if set up, execute step 505, otherwise, execute step 506；
Step 505: executing the anti-dry judgement of ceramic cooker；
Step 506: executing the anti-dry judgement of non-ceramic cookware；
Step 507: when starting the heating to cookware, obtaining the first temperature value T1 when cookware heating；
Step 508: when the cookware is heated continuously default dry combustion method and judges the time, when obtaining cookware heating the
Two temperature value T2；
Step 509: dry combustion method temperature difference threshold is calculated based on first temperature value；
Wherein, (wherein Qm is the first temperature value calculating dry combustion method temperature difference threshold ▽ Ta, ▽ Ta=C+A × Qm-T1 × B
A variable relevant with initial heating power P1, the optional value range of Qm (500W-800W) is corresponding, the optional value of T1
Range (26 DEG C -48 DEG C), the optional value range of ▽ Ta (35 DEG C -65 DEG C) A be constant can selected value 0.06742, B be that constant can
Selected value 0.9689, C are constant optional 42.23；
Step 510: calculating the difference of the second temperature value Yu first temperature value, it is described to determine that the difference is greater than
When dry combustion method temperature difference threshold, the cookware is in dry-fire condition, stops the heating to cookware；
Specifically, if T2-T1 > ▽ Ta；When determining that the difference is greater than the dry combustion method temperature difference threshold, at the cookware
In dry-fire condition, stop the heating to cookware；
Step 511: determining that the difference of the second temperature value and first temperature value is less than or equal to the dry combustion method temperature difference
Threshold value continues to heat cookware with the first power P 1；
Step 512: starting the work that the heating of cookware described in current time is obtained with the first Fixed Time Interval at the first moment
Make current value In；
Step 513: starting to obtain the of the heating of cookware described in current time with the first Fixed Time Interval at the first moment
The value Pn of two power；
Step 514: obtaining the conducting pwm value Tn of the insulated gate bipolar transistor of the heating of cookware described in current time；
Step 515: when first power P 1 is equal with the second power P n, judging In-I (n+1) > ▽ Ia, together
When T (n+1)-Tn < ▽ T it is whether true, if set up, execute step 517, otherwise, execute step 516；
Step 516: judge In-I (n+1)≤▽ Ia, simultaneously | and T (n+1)-Tn | whether < ▽ T is true, if set up,
Execute step 517, otherwise, return step 512；
Step 517: when determining first power P 1 and unequal second power P 2, continuing with second power
P2 heats the cookware；
Step 518: when the first moment started to obtain the heating of cookware described in current time with the second Fixed Time Interval
Third temperature value T3；
Step 519: determining that the third temperature value T3 is more than or equal to and overheat the corresponding temperature value Tb of power P b, described in adjustment
First power P 1, until first power is no more than the overheat power P b；
Step 520: when determining that the third temperature value T3 is more than or equal to temperature value upper limit value Tmax, the cookware is in dry
Burning state stops heating.
Fig. 6 is the main view of the electromagnetic kitchen range in the embodiment of the present invention one with ceramic pan, as shown in fig. 6, electromagnetic kitchen range
It can be used black crystal panel, when heating, ceramic cooker is placed in black crystal panel.
Fig. 7 is to be equipped with the top view for preventing the electromagnetic kitchen range of boilers from drying burning device in the embodiment of the present invention one, such as Fig. 7 institute
Show, electromagnetic kitchen range uses black crystal panel, and the black crystal panel mainly includes heating zone and operating space, the electromagnetic kitchen range heating
When, ceramic cooker is placed in heating zone.
Fig. 8 is the sectional view of ceramic pan used in the embodiment of the present invention one, wherein the pot wall of the ceramic pan is divided into
Two layers, metal film is installed between two layers of pot wall.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (12)
1. a kind of method for preventing boilers from drying burning, which is characterized in that the described method includes:
When starting the heating to cookware, the first temperature value when cookware heating is obtained；
When the cookware is heated continuously default dry combustion method and judges the time, second temperature value when cookware heating is obtained；
Dry combustion method temperature difference threshold is calculated based on first temperature value；
The difference for calculating the second temperature value Yu first temperature value determines that the difference is greater than the dry combustion method temperature difference threshold
When, the cookware is in dry-fire condition, stops the heating to cookware.
2. the method according to claim 1, wherein the method also includes:
When determining that the difference of the second temperature value and first temperature value is less than or equal to the dry combustion method temperature difference threshold, the pot
Tool is not in dry-fire condition, continues to heat cookware with the first power；
Start to execute following operation with the first Fixed Time Interval at the first moment:
Obtain the working current value of the heating of cookware described in current time；
Obtain the value of the second power of the heating of cookware described in current time；
Obtain the conducting pwm value of the insulated gate bipolar transistor of the heating of cookware described in current time；
In first power and equal second power, if meeting one of the following conditions, the cookware is in dry combustion method
State stops heating:
The working current value at first moment therewith the working current value at the latter moment difference be greater than normalized current difference,
Meanwhile the conducting pwm value at the latter moment at first moment and the difference of the conducting pwm value at first moment are less than
Pulsewidth difference is connected in standard；
The working current value at first moment therewith the working current value at the latter moment difference be less than or equal to the standard
Current differential, while the conducting pwm value at the latter moment at first moment and the conducting pwm value at first moment
The absolute value of difference is less than the standard and pulsewidth difference is connected.
3. according to the method described in claim 2, it is characterized in that, the method also includes:
When determining first power and unequal second power, continue to heat the cookware with second power.
4. the method according to claim 1, wherein the method also includes:
Determine that the difference of the second temperature value and first temperature value is less than or equal to the dry combustion method temperature difference threshold, the cookware
It is not in dry-fire condition, continues to heat the cookware with the first power；
Start third temperature value when obtaining the heating of cookware described in current time with the second Fixed Time Interval at the first moment；
It determines that the third temperature value was more than or equal to the corresponding temperature value of thermal power, adjusts first power, until described
First power crosses thermal power no more than described；
Continue to heat the cookware with the first power being adjusted.
5. according to the method described in claim 4, it is characterized in that, the method also includes:
Determine that the third temperature value is more than or equal to temperature value upper limit value, the cookware is in dry-fire condition, stops heating.
6. the method according to claim 1, wherein the method also includes:
Before first temperature value for obtaining sensor,
Forward voltage value and the institute at electromagnetic kitchen range current time are obtained with third Fixed Time Interval in preposition detection time section
State the preposition current value at electromagnetic kitchen range current time；
Ceramic pan judgment threshold current value is calculated based on the forward voltage value and preposition current value；
If the preposition current value is less than the ceramic pan judgment threshold current value, judge current cookware for ceramic cooker.
7. a kind of device for preventing boilers from drying burning, which is characterized in that described device includes:
Sensor module, for obtaining the first temperature value and second temperature value when the cookware heats；
Timing module for recording the heating time to the cookware, and judges whether reach to the continuous heating of the cookware
Default dry combustion method judges the time；
Dry combustion method temperature difference threshold computing module, for calculating dry combustion method temperature difference threshold based on first temperature value；
Dry combustion method judgment module, for calculating the difference of the second temperature value Yu first temperature value, based on the difference and
The dry combustion method temperature difference threshold judges whether the cookware is in dry-fire condition；
The dry combustion method judgment module is also used to: being issued and is stopped heating instructions；
Power output module, for being heated to the cookware；
The power output module is also used to: being received the stopping heating instructions, is stopped heating the cookware.
8. device according to claim 7, which is characterized in that
The dry combustion method judgment module is also used to: being issued and is continued heating instructions；
The power output module is also used to: being received the continuation heating instructions, is heated the cookware with the first power；
Described device further include:
Operating current obtains module, for obtaining the working current value of the heating of cookware described in current time；
Power acquisition module, the value of the second power for obtaining the heating of cookware described in current time；
Pulsewidth is connected and obtains module, the conducting arteries and veins of the insulated gate bipolar transistor for obtaining the heating of cookware described in current time
Width values；
The dry combustion method judgment module, be also used to based on the working current value, normalized current difference, the value of first power,
The value of second power, the conducting pwm value and standard conducting pulsewidth difference judge whether the cookware is in dry combustion method shape
State.
9. device according to claim 8, which is characterized in that
The power output module is also used to: being received the continuation heating instructions, is heated the cookware with the second power.
10. device according to claim 7, which is characterized in that
The sensor module is also used to: when the first moment started to obtain cookware heating with the second Fixed Time Interval
Third temperature value；
The dry combustion method judgment module is also used to judge whether the third temperature value was more than the corresponding temperature value of thermal power, and
Adjustment instruction is sent to power output module in third temperature value temperature value corresponding more than the thermal power excessively；
The power output module is also used to: being received the adjustment instruction, is continued described in the first power heating to be adjusted
Cookware.
11. device according to claim 8, which is characterized in that described device further include:
The dry combustion method judgment module is also used to judge whether the cookware is in dry combustion method based on temperature upper limit and third temperature value
State.
12. device according to claim 7, which is characterized in that described device further include:
Forward voltage obtains module, for obtaining the forward voltage value of the cookware heating；
Preposition electric current obtains module, for obtaining the preposition current value of the cookware heating；
Ceramic pan judgment threshold current calculation module is sentenced for calculating ceramic pan based on the forward voltage value and preposition current value
Disconnected threshold current value；
Cookware judgment module, for judging current cookware based on the preposition current value and the ceramic pan judgment threshold current value
It whether is ceramic cooker.
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| CN111343736A (en) * | 2020-03-12 | 2020-06-26 | 胡艳军 | Immersion type thick film liquid heater and electronic dry burning prevention method thereof |
| CN111728493A (en) * | 2020-05-29 | 2020-10-02 | 九阳股份有限公司 | Heating control method for electric steamer and electric steamer |
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| CN113133636A (en) * | 2020-01-17 | 2021-07-20 | 九阳股份有限公司 | Dry burning prevention detection method for cooking appliance and cooking appliance |
| CN114532861A (en) * | 2020-11-27 | 2022-05-27 | 杭州九阳小家电有限公司 | Food processing machine and dry burning prevention control method thereof |
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