CN108738182A - Electromagnetic heater and its method for heating and controlling - Google Patents
Electromagnetic heater and its method for heating and controlling Download PDFInfo
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- CN108738182A CN108738182A CN201710245971.6A CN201710245971A CN108738182A CN 108738182 A CN108738182 A CN 108738182A CN 201710245971 A CN201710245971 A CN 201710245971A CN 108738182 A CN108738182 A CN 108738182A
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- electromagnetic heater
- cookware
- threshold value
- predetermined threshold
- heating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/08—Arrangement or mounting of control or safety devices
- F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Cookers (AREA)
Abstract
The invention discloses a kind of electromagnetic heater and its method for heating and controlling, this approach includes the following steps：Obtain the number for the overturning pulse that synchronous circuit exports in electromagnetic heater in the first preset time；If the number for overturning pulse is more than the first predetermined threshold value and is less than the second predetermined threshold value, controls electromagnetic heater and heated with the first predetermined power, and detect the collector voltage of IGBT pipes in electromagnetic heater；If the collector voltage of IGBT pipes is greater than or equal to predetermined voltage threshold, then identify that cookware belongs to first kind cookware, and control electromagnetic heater and carry out limit power heating, so as to effectively quickly recognize whether heating cookware matches with electromagnetic heater, avoid the damage of component.
Description
Technical field
The present invention relates to household electrical appliance technical field, more particularly to a kind of electromagnetic heater and a kind of electromagnetic heater
Method for heating and controlling.
Background technology
Relevant electromagnetic heater such as electromagnetic oven belongs to inductive load heating equipment, heats the characteristic of cookware to electromagnetism
Stove performance is affected.In the related art, electromagnetic oven needs to heat matched cookware, with effective protection electromagnetic oven.
But itself the problem is that, user can use various materials cookware, when electromagnetic oven heats unmatched cookware,
The components temperature such as IGBT, the resonant capacitance in electromagnetic oven can be caused excessively high, and then electromagnetic oven is caused to damage.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention
One purpose is to propose a kind of method for heating and controlling of electromagnetic heater, can effectively quickly recognize and whether heat cookware
It is matched with electromagnetic heater, avoids the damage of component.
It is another object of the present invention to propose a kind of electromagnetic heater.
In order to achieve the above objectives, one aspect of the present invention proposes a kind of control method of electromagnetic heater, including following
Step：Obtain the number for the overturning pulse that synchronous circuit exports in the electromagnetic heater in the first preset time；If institute
The number for stating overturning pulse is more than the first predetermined threshold value and is less than the second predetermined threshold value, then controls the electromagnetic heater with the
One predetermined power is heated, and detects the collector voltage of IGBT pipes in the electromagnetic heater；If the IGBT pipes
Collector voltage be greater than or equal to predetermined voltage threshold, then identify that the cookware belongs to first kind cookware, and control the electricity
Magnetic heating device carries out limit power heating.
The control method of the electromagnetic heater proposed according to embodiments of the present invention obtains electromagnetism in the first preset time and adds
The number for the overturning pulse that synchronous circuit exports in thermal, if the number of overturning pulse is more than the first predetermined threshold value and is less than
Second predetermined threshold value is then controlled electromagnetic heater and is heated with the first predetermined power, and detected in electromagnetic heater
The collector voltage of IGBT pipes, and if the collector voltage of IGBT pipes is greater than or equal to predetermined voltage threshold, identify pot
Tool belongs to first kind cookware, and controls electromagnetic heater and carry out limit power heating, adds so as to quickly, efficiently identify
Whether the characteristic of hot pot tool matches with electromagnetic heater, avoids the damage of component, and extend electromagnetic heater uses the longevity
Life improves user experience.
According to one embodiment of present invention, if the collector voltage of the IGBT pipes continues in the second preset time
It less than the predetermined voltage threshold, then identifies that the cookware belongs to the second class cookware, and controls the electromagnetic heater and carry out
Normal power heats.
According to one embodiment of present invention, if the number of the overturning pulse is more than third predetermined threshold value and is less than institute
The first predetermined threshold value is stated, then identifies that the cookware belongs to the second class cookware, and controls the electromagnetic heater and carries out just
Normal power heating.
According to one embodiment of present invention, if the number of the overturning pulse is less than or equal to the third predetermined threshold value
Or be more than or equal to second predetermined threshold value, then identify that the cookware belongs to the third class cookware, and control the electromagnetism and add
Thermal stops heating.
According to one embodiment of present invention, first predetermined threshold value can be 5, and second predetermined threshold value can be 12,
The third predetermined threshold value can be 0.
According to one embodiment of present invention, the value range of second preset time can be 1s to 5s.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes a kind of electromagnetic heater, including：Resonance electricity
Road, the resonance circuit include resonant capacitance, heating coil and IGBT pipes；Synchronous circuit, the first input of the synchronous circuit
End and the second input terminal are connected with the both ends of the resonant capacitance respectively, and the synchronous circuit is according to the resonant capacitance both ends
Voltage generates overturning pulse；Control unit, described control unit respectively with the grid of the IGBT pipes and the synchronous circuit
Output end is connected, and described control unit is used to obtain in the first preset time what synchronous circuit in the electromagnetic heater exported
The number of pulse is overturn, and when the number of the overturning pulse is more than the first predetermined threshold value and is less than the second predetermined threshold value, control
It makes the electromagnetic heater to be heated with the first predetermined power, and obtains the collector voltage of the IGBT pipes, Yi Ji
When the collector voltage of the IGBT pipes is greater than or equal to predetermined voltage threshold, identify that the cookware belongs to first kind cookware, and
It controls the electromagnetic heater and carries out limit power heating.
The electromagnetic heater proposed according to embodiments of the present invention, control unit obtain electromagnetic heating in the first preset time
The number for the overturning pulse that synchronous circuit exports in device, and in the number of overturning pulse it is more than the first predetermined threshold value and less than the
When two predetermined threshold values, control electromagnetic heater is heated with the first predetermined power, and obtains the collector voltage of IGBT pipes,
And when the collector voltage of IGBT pipes is greater than or equal to predetermined voltage threshold, identification cookware belongs to first kind cookware, and controls
Electromagnetic heater processed carry out limit power heating, so as to quickly, efficiently identify heating cookware characteristic whether with electricity
Magnetic heating device matches, and avoids the damage of component, extends the service life of electromagnetic heater, improves user experience.
According to one embodiment of present invention, described control unit is additionally operable to exist in the collector voltage of the IGBT pipes
When in the second preset time continuously less than the predetermined voltage threshold, identify that the cookware belongs to the second class cookware, and control institute
It states electromagnetic heater and carries out normal power heating.
According to one embodiment of present invention, described control unit is additionally operable to be more than the in the number of the overturning pulse
Three predetermined threshold values and when less than first predetermined threshold value, identify that the cookware belongs to the second class cookware, and described in controlling
Electromagnetic heater carries out normal power heating.
According to one embodiment of present invention, described control unit, be additionally operable to it is described overturning pulse number be less than etc.
In the third predetermined threshold value or more than or equal to second predetermined threshold value when, identify that the cookware belongs to the third class pot
Tool, and control the electromagnetic heater and stop heating.
According to one embodiment of present invention, first predetermined threshold value can be 5, and second predetermined threshold value can be 12,
The third predetermined threshold value can be 0.
According to one embodiment of present invention, the value range of second preset time can be 1s to 5s.
Description of the drawings
Fig. 1 is the flow chart of the control method of electromagnetic heater according to the ... of the embodiment of the present invention；
Fig. 2 is the flow chart of the control method of electromagnetic heater according to an embodiment of the invention；
Fig. 3 is the block diagram of electromagnetic heater according to the ... of the embodiment of the present invention；And
Fig. 4 is the circuit diagram of electromagnetic heater according to the ... of the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below in conjunction with the accompanying drawings come be described in detail the embodiment of the present invention electromagnetic heater and its control method.
Fig. 1 is the flow chart of the control method of electromagnetic heater according to the ... of the embodiment of the present invention.As shown in Figure 1, the party
Method includes the following steps：
S101：Obtain the number for the overturning pulse that synchronous circuit exports in electromagnetic heater in the first preset time.
In one particular embodiment of the present invention, the control unit of electromagnetic heater can be produced every 1s by the ports PPG
The square-wave pulse signal of raw 1 7us, and the pulse signal is formed via power switch tube, heating coil and resonant capacitance
Resonance circuit feeds back to two input terminals of comparator in synchronous circuit.
It should be noted that the output of pulse signal control of control unit can have it is following two：One is that program starts
Output of pulse signal, that is, first pulse started are controlled by program, that is, generate the side of 1 7us by the ports PPG every 1s
Wave signal；Second is that in subsequent pulse signal, relatively turned over using the voltage Va and Vb at the both ends resonant capacitance (C1 in such as Fig. 3)
Turn to follow output (i.e. synchronous relatively to export).
Specifically, synchronous circuit includes detection unit, wherein detection unit is for detecting resonant capacitance (in such as Fig. 3
C1) the voltage at both ends, such as the voltage of detectable resonant capacitance right end detect voltage Va to export first by the first output end,
And the voltage of detectable resonant capacitance left end is with by second output terminal output the second detection voltage Vb, the first of detection unit is defeated
Outlet and second output terminal are connected with the negative input end of comparator and positive input terminal respectively, and comparator can be to the first detection voltage Va
With second detection voltage Vb be compared, and according to follow comparison result export synchronizing signal.
Wherein, synchronous circuit follows the comparison result of Va and Vb to export 1 subsynchronous signal, the overturning arteries and veins that synchronous circuit generates
It rushes number and increases by 1, you can the count value for controlling pulse counter adds 1, and it is default to be recordable in first from there through pulse counter
The pulse number that synchronous circuit generates in time such as 1s.
S102：If the number for overturning pulse is more than the first predetermined threshold value and is less than the second predetermined threshold value, electromagnetism is controlled
Heating device is heated with the first predetermined power, and detects the collector voltage of IGBT pipes in electromagnetic heater.
Wherein, according to one embodiment of present invention, the first predetermined threshold value can be 5, and the second predetermined threshold value can be 12.And
And first predetermined power can be 1600W.
Specifically, the collector of IGBT pipes can be connected with the right end of resonant capacitance, as a result, can be defeated according to synchronous circuit first
First detection voltage Va of outlet output obtains the collector voltage of IGBT pipes, i.e. the collector voltage of IGBT pipes can be the first inspection
Survey voltage Va.
S103：If the collector voltage of IGBT pipes is greater than or equal to predetermined voltage threshold, identify that cookware belongs to first
Class cookware, and control electromagnetic heater and carry out limit power heating.
It should be noted that first kind cookware can refer to " poor pot ", i.e., the characteristic of cookware material and electromagnetic heater be not
Match, limit power heating need to be carried out.
That is, after detecting that electromagnetic heater is placed with cookware, electromagnetism in the first preset time can be first obtained
The number for the overturning pulse that synchronous circuit exports in heating device, and judge whether that entering poor pot examines according to the number of overturning pulse
The survey stage, if the number of overturning pulse is more than the first predetermined threshold value and is less than the second predetermined threshold value, such as the first preset time
The pulse number that interior synchronous circuit generates then enters poor pot detection-phase between 5 and 12.
In poor pot detection-phase, controllable electromagnetic heater is heated with the first predetermined power such as 1600W, and right
Collector (poles C) voltage of IGBT pipes is detected in electromagnetic heater, to judge whether the collector voltage of IGBT pipes goes out
Existing overvoltage, if there is overvoltage, i.e. the collector voltage of IGBT pipes is greater than or equal to predetermined voltage threshold, then identifies that cookware belongs to
First kind cookware, that is, poor pot, and can be " 1 " by poor pot mark position.As a result, after recognizing first kind cookware, control electromagnetism adds
Thermal carries out limit power heating, such as when the current heating power of electromagnetic heater is more than predetermined power limits value, control
Electromagnetic heater processed is heated with predetermined power limits value, when the current heating power system of electromagnetic heater is less than or waits
When predetermined power limits value, control electromagnetic heater is heated with current heating, to prevent adding for first kind cookware
Thermal power is excessively high, the component of effective protection electromagnetic heater.
According to one embodiment of present invention, if the collector voltage of IGBT pipes in the second preset time continuously less than
Predetermined voltage threshold then identifies that cookware belongs to the second class cookware, and controls electromagnetic heater and carry out normal power heating.Its
In, the value range of the second preset time is 1s to 5s, preferably can be 5s.
It should be noted that timing can be carried out to the heating time of electromagnetic heater by counter, for example, being counted per 1s
The count value of number device when that is, the count value of counter is 5, illustrates that the heating time of electromagnetic heater reaches 5s from adding 1.
It should be noted that the second class cookware can refer to " good pot ", the i.e. characteristic of cookware material and electromagnetic heater phase
Match, it can normal heating.
That is, after entering poor pot detection-phase, restart to count after controllable counter O reset, with to electromagnetism
The heating time timing that heating device is heated with the first predetermined power, and persistently judge during counting the current collection of IGBT pipes
Whether pole tension there is overvoltage.The count value of counter do not reach pre-set count values (according to the second preset time be arranged, such as
Second preset time is that 5s if there is overvoltage, then it is i.e. poor to identify that cookware belongs to the first kind cookware when pre-set count values can be 5)
Pot, and control electromagnetic heater and carry out limit power heating；When the count value of counter reaches pre-set count values, if always
Do not occur overvoltage, i.e. the collector voltage of IGBT pipes is less than predetermined voltage threshold, then identifies that cookware belongs to the second class cookware, poor pot
Flag bit remains 0.As a result, after recognizing the second class cookware, electromagnetic heater can control to carry out normal power heating, nothing
Electromagnetic heater need to be controlled and carry out limit power heating.
Cookware identification as a result, only executes in the second preset time such as 5s after detecting pot, remaining time is no longer
It executes, it is ensured that system can stablize heating.
According to one embodiment of present invention, if the number of overturning pulse is more than third predetermined threshold value and is less than first in advance
If threshold value, then identify that cookware belongs to the second class cookware, and controls electromagnetic heater and carry out normal power heating.Wherein, third
Predetermined threshold value can be 0.
Specifically, in the number for obtaining the overturning pulse that synchronous circuit exports in electromagnetic heater in the first preset time
Later, if it is determined that overturning pulse number be more than third predetermined threshold value and be less than the first predetermined threshold value, such as first it is default when
The pulse number that interior synchronous circuit generates does not enter poor pot detection-phase then, directly judges that cookware is between 0 and 5
Second class cookware, the high-quality material cookware as to match with electromagnetic heater characteristic, and electromagnetic heater is controlled with just
Normal power is heated.
According to one embodiment of present invention, if the number of overturning pulse is less than or equal to third predetermined threshold value or is more than etc.
It in the second predetermined threshold value, then identifies that cookware belongs to the third class cookware, and controls electromagnetic heater and stop heating.
It should be noted that third class cookware can refer to be not suitable for heating cookware, such as the area of cookware bottom is too small or non-
For example wooden material cookware of the cookware of metal material, cannot heat.
That is, in for obtaining the overturning pulse that synchronous circuit exports in electromagnetic heater in the first preset time
After number, if it is determined that the number of overturning pulse is less than or equal to third predetermined threshold value or is more than or equal to the second predetermined threshold value, such as
The pulse number n that synchronous circuit generates in first preset time is 0, or is more than 12, then judges cookware for third class pot
Tool, such cookware cannot be heated, and then control electromagnetic heater to cookware without heating.
Thus, it is possible to type, that is, first kind cookware, the second class cookware or the third class cookware of cookware rapidly be distinguished, with control
Electromagnetic heater processed provides matched heating to different cookwares and acts, and the characteristic due to cookware is avoided to add with electromagnetism
Thermal is mismatched and is damaged to electromagnetic heater.
A specific embodiment according to the present invention, as shown in Fig. 2, the control method of the electromagnetic heater includes following
Step：
S201：Start, overturning pulse number is counted in the first preset time, and to counter O reset.
S202：Judge to overturn whether pulse number is more than third predetermined threshold value and is less than the second predetermined threshold value.Wherein, third
Predetermined threshold value can be 0, and the second predetermined threshold value can be 12.
If so, thening follow the steps S203；If it is not, then return to step S201.
S203：Judge whether the number for overturning pulse is more than the first predetermined threshold value and is less than the second predetermined threshold value.Wherein,
One predetermined threshold value can be 5.
If so, thening follow the steps S204；If not, thening follow the steps S210.
S204：Control counter is counted.
S205：Judge whether poor pot flag bit has been set, i.e., whether poor pot flag bit is set to " 1 ".
If so, thening follow the steps S209；If not, thening follow the steps S206.
S206：Judge whether the count value of counter is less than or equal to pre-set count values.
If so, thening follow the steps S207；If not, thening follow the steps S210.
Wherein, pre-set count values can be set according to the second preset time, such as the second preset time is 5s, pre-set count values
Can be 5.
S207：Control electromagnetic heater is heated with the first predetermined power.
S208：Judge whether the collector voltage of IGBT is over-pressed.
If so, thening follow the steps S209；If not, thening follow the steps S210.
S209：Control electromagnetic heater has set poor pot flag bit and has carried out limit power heating.
S210：Control electromagnetic heater heats cookware with normal heating power.
According to one embodiment of present invention, electromagnetic heater can be electromagnetic oven or electromagnetic stove etc..
In conclusion the control method of the electromagnetic heater proposed according to embodiments of the present invention, when acquisition first is default
The number for the overturning pulse that synchronous circuit exports in interior electromagnetic heater, presets if the number of overturning pulse is more than first
Threshold value and be less than the second predetermined threshold value, then control electromagnetic heater and heated with the first predetermined power, and detect electromagnetism and add
The collector voltage of IGBT pipes in thermal, and if the collector voltage of IGBT pipes is greater than or equal to predetermined voltage threshold,
It then identifies that cookware belongs to first kind cookware, and controls electromagnetic heater and carry out limit power heating, so as to rapidly, effectively
Whether the characteristic of ground identification heating cookware matches with electromagnetic heater, avoids the damage of component, extends electromagnetic heater
Service life, improve user experience.
Fig. 3 is the block diagram of electromagnetic heater according to the ... of the embodiment of the present invention.As shown in Figure 3 and Figure 4, the electromagnetism
Heating device 100 includes：Resonance circuit 10, synchronous circuit 20 and control unit 30.
Wherein, resonance circuit 10 includes resonant capacitance C1, heating coil L1 and IGBT pipe；First input of synchronous circuit 20
End and the second input terminal are connected with the both ends of resonant capacitance C1 respectively, and synchronous circuit 20 is given birth to according to the voltage at the both ends resonant capacitance C1
At overturning pulse, control unit 30 is connected with the grid of IGBT pipes (poles G) and the output end of synchronous circuit 20 respectively, control unit
30 number for obtaining the overturning pulse that synchronous circuit 20 exports in electromagnetic heater 100 in the first preset time.
In one particular embodiment of the present invention, the control unit 30 of electromagnetic heater 100 can be every 1s by the ends PPG
Mouth generates the square-wave pulse signal of 1 7us, and the pulse signal is via power switch tube IGBT, heating coil L1 and resonance
The resonance circuit 10 of capacitance C1 compositions feeds back to two input terminals of comparator 50 in synchronous circuit 20.
It should be noted that the output of pulse signal control of control unit 30 can have it is following two：One is that program opens
Moving pulse signal exports, that is, first pulse started is controlled by program, that is, every 1s by 1 7us's of the ports PPG generation
Square-wave signal；Second is that in subsequent pulse signal, voltage Va and Vb using the both ends resonant capacitance (C1 in such as Fig. 3) compare
Overturning follows output (i.e. synchronous relatively to export).
For more, synchronous circuit 20 includes detection unit 60, wherein detection unit 60 is for detecting resonant capacitance (such as
C1 in Fig. 3) both ends voltage, such as the voltage of detectable resonant capacitance C1 right ends is to pass through the first inspection of the first output end output
Voltage Va is surveyed, and the voltage of detectable resonant capacitance C1 left ends is to pass through second output terminal output the second detection voltage Vb, detection
The first output end and second output terminal of unit 60 are connected with the negative input end of comparator 50 and positive input terminal respectively, comparator 50
Can to first detection voltage Va and second detection voltage Vb be compared, and according to follow comparison result export synchronizing signal.
Wherein, synchronous circuit 20 follows the comparison result of Va and Vb to export 1 subsynchronous signal, and what synchronous circuit 20 generated turns over
Turn pulse number and increase by 1, you can the count value for controlling pulse counter adds 1, and first is recordable in from there through pulse counter
The pulse number that synchronous circuit generates in preset time such as 1s.
Also, control unit 30 overturn pulse number be more than the first predetermined threshold value and less than the second predetermined threshold value when,
Control electromagnetic heater 100 is heated with the first predetermined power, and obtains the collector voltage of IGBT pipes.
Wherein, according to one embodiment of present invention, the first predetermined threshold value is 5, and the second predetermined threshold value is 12.Also, the
One predetermined power can be 1600W.
Specifically, the collector of IGBT pipes can be connected with the right end of resonant capacitance, as a result, can be defeated according to synchronous circuit first
First detection voltage Va of outlet output obtains the collector voltage of IGBT pipes, i.e. the collector voltage of IGBT pipes can be the first inspection
Survey voltage Va.
And when collector (poles C) voltage of IGBT pipes is greater than or equal to predetermined voltage threshold, identification cookware belongs to the
A kind of cookware, and control electromagnetic heater 100 and carry out limit power heating.
It should be noted that first kind cookware can refer to " poor pot ", i.e., the characteristic of cookware material and electromagnetic heater be not
Match, limit power heating need to be carried out.
That is, after detecting that electromagnetic heater 100 is placed with cookware, can first obtain electric in the first preset time
In magnetic heating device 100 synchronous circuit 20 export overturning pulse number, and according to overturning pulse number judge whether into
Enter poor pot detection-phase, if the number of overturning pulse is more than the first predetermined threshold value and is less than the second predetermined threshold value, such as first
The pulse number that synchronous circuit generates in preset time then enters poor pot detection-phase between 5 and 12.
In poor pot detection-phase, control unit 30 can control electromagnetic heater 100 with the first predetermined power such as 1600W
It is heated, and the collector of IGBT pipes in electromagnetic heater 100 (poles C) voltage is detected, to judge IGBT pipes
Whether collector voltage there is overvoltage, and if there is overvoltage, i.e. the collector voltage of IGBT pipes is greater than or equal to predeterminated voltage threshold
Value then identifies that cookware belongs to the i.e. poor pot of first kind cookware, and can be " 1 " by poor pot mark position.Recognizing the first kind as a result,
After cookware, control unit 30 controls electromagnetic heater 100 and carries out limit power heating, such as working as when electromagnetic heater 100
When preceding heating power is more than predetermined power limits value, control unit 30 controls electromagnetic heater 100 with predetermined power limits value
It is heated, when the current heating power system of electromagnetic heater 100 is less than or equal to predetermined power limits value, control unit
30 control electromagnetic heaters 100 are heated with current heating, to prevent the heating power of first kind cookware excessively high, effectively
Protect the component of electromagnetic heater.
According to one embodiment of present invention, if the collector voltage of IGBT pipes in the second preset time continuously less than
Predetermined voltage threshold then identifies that cookware belongs to the second class cookware, and controls electromagnetic heater 100 and carry out normal power heating.
Wherein, the value range of the second preset time is 1s to 5s, preferably can be 5s.
It should be noted that timing can be carried out to the heating time of electromagnetic heater 100 by counter, for example, often
The count value of 1s counters when that is, the count value of counter is 5, illustrates that the heating time of electromagnetic heater 100 reaches from adding 1
5s。
It should be noted that the second class cookware can refer to " good pot ", the i.e. characteristic of cookware material and electromagnetic heater phase
Match, it can normal heating.
That is, after entering poor pot detection-phase, control unit 30 restarts to count after can control counter O reset
Number, with the heating time timing heated with the first predetermined power to electromagnetic heater 100, and persistently sentences during counting
Whether the collector voltage of disconnected IGBT pipes there is overvoltage.It is (pre- according to second that pre-set count values are not reached in the count value of counter
If the time is arranged, such as the second preset time is that 5s if there is overvoltage, then identifies cookware category when pre-set count values can be 5)
In first kind cookware, that is, poor pot, and controls electromagnetic heater and carry out limit power heating；It is reached in the count value of counter default
When count value, if not occurring overvoltage always, i.e., the collector voltage of IGBT pipes is less than predetermined voltage threshold, then identifies cookware category
In the second class cookware, poor pot flag bit remains 0.As a result, after recognizing the second class cookware, control unit 30 can control electromagnetism
Heating device 100 carries out normal power heating, and limit power heating is carried out without controlling electromagnetic heater 100.
That is, cookware identification only executes in the second preset time such as 5s after detecting pot, remaining time
It no longer executes, it is ensured that system can stablize heating.
According to one embodiment of present invention, control unit 30 is additionally operable to be more than the default threshold of third in the number of overturning pulse
When being worth and being less than the first predetermined threshold value, identification cookware belongs to the second class cookware, and controls electromagnetic heater 100 and carry out just
Normal power heating.Wherein, third predetermined threshold value can be 0.
Specifically, the overturning pulse that synchronous circuit 20 exports in electromagnetic heater 100 in the first preset time is being obtained
Number after, if it is determined that the number of overturning pulse is more than third predetermined threshold value and is less than the first predetermined threshold value, such as first
The pulse number n that synchronous circuit 20 generates in preset time does not enter poor pot detection-phase then, directly sentences between 0 and 5
Disconnected cookware is the second class cookware, the high-quality material cookware as to match with 100 characteristic of electromagnetic heater, the control of control unit 30
Electromagnetic heater 100 processed is heated with normal power.
According to one embodiment of present invention, control unit 30 is additionally operable to pre- less than or equal to third in the number of overturning pulse
If threshold value or when more than or equal to the second predetermined threshold value, identification cookware belongs to third class cookware, and controls electromagnetic heater 100 and stops
Only heat.
It should be noted that third class cookware can refer to be not suitable for heating cookware, such as the area of cookware bottom is too small or non-
For example wooden material cookware of the cookware of metal material, cannot heat.
That is, obtaining the overturning arteries and veins that synchronous circuit 20 exports in electromagnetic heater 100 in the first preset time
After the number of punching, if it is determined that the number of overturning pulse is less than or equal to third predetermined threshold value or is more than or equal to the second default threshold
Value, such as the pulse number n that synchronous circuit generates in the first preset time is 0, or be more than 12, then judge cookware for the
Three classes cookware, such cookware cannot be heated, and then control unit 30 controls heating device 100 to cookware without heating.
Thus, it is possible to the type for rapidly distinguishing cookware is first kind cookware, the second class cookware or third class cookware,
Matched heating action is provided different cookwares to control electromagnetic heater 100, avoids the characteristic due to cookware
It is mismatched with electromagnetic heater and electromagnetic heater 100 is damaged.
According to one embodiment of present invention, electromagnetic heater 100 can be electromagnetic oven or electromagnetic stove etc..
In conclusion the electromagnetic heater proposed according to embodiments of the present invention, it is default that control unit can obtain first
The number for the overturning pulse that synchronous circuit exports in electromagnetic heater in time, and it is more than first in advance in the number of overturning pulse
If threshold value and when less than the second predetermined threshold value, control electromagnetic heater is heated with the first predetermined power, and obtains IGBT
The collector voltage of pipe, and when the collector voltage of IGBT pipes is greater than or equal to predetermined voltage threshold, identification cookware belongs to
First kind cookware, and control electromagnetic heater and carry out limit power heating, so as to quickly, efficiently identify heating cookware
Characteristic whether matched with electromagnetic heater, avoid the damage of component, extend the service life of electromagnetic heater, improve
User experience.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (12)
1. a kind of method for heating and controlling of electromagnetic heater, which is characterized in that include the following steps：
Obtain the number for the overturning pulse that synchronous circuit exports in the electromagnetic heater in the first preset time；
If the number of the overturning pulse is more than the first predetermined threshold value and is less than the second predetermined threshold value, controls the electromagnetism and add
Thermal is heated with the first predetermined power, and detects the collector voltage of IGBT pipes in the electromagnetic heater；
If the collector voltage of the IGBT pipes is greater than or equal to predetermined voltage threshold, identify that the cookware belongs to the first kind
Cookware, and control the electromagnetic heater and carry out limit power heating.
2. the cookware recognition methods of electromagnetic heater according to claim 1, which is characterized in that if the IGBT is managed
Collector voltage in the second preset time continuously less than the predetermined voltage threshold, then identify that the cookware belongs to the second class
Cookware, and control the electromagnetic heater and carry out normal power heating.
3. the cookware recognition methods of electromagnetic heater according to claim 1, which is characterized in that
If the number of the overturning pulse is more than third predetermined threshold value and is less than first predetermined threshold value, the pot is identified
Tool belongs to the second class cookware, and controls the electromagnetic heater and carry out normal power heating.
4. the cookware recognition methods of electromagnetic heater according to claim 3, which is characterized in that
If the number of the overturning pulse is less than or equal to the third predetermined threshold value or is more than or equal to second predetermined threshold value,
It then identifies that the cookware belongs to the third class cookware, and controls the electromagnetic heater and stop heating.
5. the cookware recognition methods of electromagnetic heater according to claim 4, which is characterized in that the first default threshold
Value is 5, and second predetermined threshold value is 12, and the third predetermined threshold value is 0.
6. the cookware recognition methods of electromagnetic heater according to claim 1, which is characterized in that it is described second it is default when
Between value range be 1s to 5s.
7. a kind of electromagnetic heater, which is characterized in that including：
Resonance circuit, the resonance circuit include resonant capacitance, heating coil and IGBT pipes；
Synchronous circuit, the first input end of the synchronous circuit and the second input terminal respectively with the both ends phase of the resonant capacitance
Even, the synchronous circuit generates overturning pulse according to the voltage at the resonant capacitance both ends；
Control unit, described control unit are connected with the output end of the grid of the IGBT pipes and the synchronous circuit respectively, institute
State of the control unit for obtaining the overturning pulse that synchronous circuit exports in the electromagnetic heater in the first preset time
Number, and when the number of the overturning pulse is more than the first predetermined threshold value and is less than the second predetermined threshold value, controls the electromagnetism and add
Thermal is heated with the first predetermined power, and obtains the collector voltage of the IGBT pipes, and in the IGBT pipes
When collector voltage is greater than or equal to predetermined voltage threshold, identify that the cookware belongs to first kind cookware, and control the electromagnetism
Heating device carries out limit power heating.
8. electromagnetic heater according to claim 7, which is characterized in that described control unit is additionally operable to described
The collector voltage of IGBT pipes in the second preset time continuously less than the predetermined voltage threshold when, identify that the cookware belongs to
Second class cookware, and control the electromagnetic heater and carry out normal power heating.
9. electromagnetic heater according to claim 7, which is characterized in that described control unit is additionally operable to turn over described
Turn the number of pulse more than third predetermined threshold value and when being less than first predetermined threshold value, identifies that the cookware belongs to described second
Class cookware, and control the electromagnetic heater and carry out normal power heating.
10. electromagnetic heater according to claim 9, which is characterized in that described control unit is additionally operable to turn over described
When turning the number of pulse less than or equal to the third predetermined threshold value or more than or equal to second predetermined threshold value, the cookware is identified
Belong to the third class cookware, and controls the electromagnetic heater and stop heating.
11. electromagnetic heater according to claim 10, which is characterized in that first predetermined threshold value is 5, described the
Two predetermined threshold values are 12, and the third predetermined threshold value is 0.
12. electromagnetic heater according to claim 7, which is characterized in that the value range of second preset time
For 1s to 5s.
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| CN201710245971.6A CN108738182B (en) | 2017-04-14 | 2017-04-14 | Electromagnetic heating device and heating control method thereof |
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| CN201710245971.6A CN108738182B (en) | 2017-04-14 | 2017-04-14 | Electromagnetic heating device and heating control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207170A (en) * | 2018-11-16 | 2019-09-06 | 华帝股份有限公司 | Control system and control method of gas stove |
| CN113339854A (en) * | 2020-03-02 | 2021-09-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method, control device, cooking equipment and computer-readable storage medium |
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| CN102905411A (en) * | 2012-10-17 | 2013-01-30 | 美的集团股份有限公司 | Control circuit for cookware material judgment and method thereof |
| CN106152193A (en) * | 2015-04-08 | 2016-11-23 | 美的集团股份有限公司 | Electromagnetic heating system and pan testing circuit, detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102905411A (en) * | 2012-10-17 | 2013-01-30 | 美的集团股份有限公司 | Control circuit for cookware material judgment and method thereof |
| CN106152193A (en) * | 2015-04-08 | 2016-11-23 | 美的集团股份有限公司 | Electromagnetic heating system and pan testing circuit, detection method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207170A (en) * | 2018-11-16 | 2019-09-06 | 华帝股份有限公司 | Control system and control method of gas stove |
| CN110207170B (en) * | 2018-11-16 | 2020-07-14 | 华帝股份有限公司 | Control system and control method of gas stove |
| CN113339854A (en) * | 2020-03-02 | 2021-09-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method, control device, cooking equipment and computer-readable storage medium |
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| CN108738182B (en) | 2020-11-20 |
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