CN104170524A - Induction heat cooker - Google Patents
Induction heat cooker Download PDFInfo
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- CN104170524A CN104170524A CN201380014442.5A CN201380014442A CN104170524A CN 104170524 A CN104170524 A CN 104170524A CN 201380014442 A CN201380014442 A CN 201380014442A CN 104170524 A CN104170524 A CN 104170524A
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- drive circuit
- driving frequency
- described drive
- driving
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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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- Induction Heating Cooking Devices (AREA)
Abstract
In the present invention, an inverter circuit (23) is driven according to determination results of a load determining means, and in a state in which a drive frequency for the inverter circuit (23) is constant, variations per prescribed time in input current or coil current are found. On the basis of the variations per prescribed time, changes in temperature of an object (5) to be heated are detected.
Description
Technical field
The present invention relates to induction heating cooking instrument.
Background technology
In induction heating cooking instrument in the past, have by the input current of inverter, the example that controlled quentity controlled variable is judged the temperature of heating object.
For example, propose to have so that the input current of inverter becomes the control unit of constant mode control inverter, judge and suppress greatly the induction heating cooking instrument (for example,, with reference to patent documentation 1) of the output of inverter as the variations in temperature of heating object taking the situation of the interior variation that has controlled quentity controlled variable more than regulation at the appointed time.
In addition for example, propose to possess the temperature-detecting device (for example,, with reference to patent documentation 2) of the induction heating cooking instrument of the temperature determination processing unit of judging the temperature corresponding with the variable quantity of the input current being detected by the input current change amount detection of variable quantity that only detects input current.
Patent documentation 1: TOHKEMY 2008-181892 communique (the 3rd page～the 5th page, Fig. 1)
Patent documentation 2: Japanese kokai publication hei 5-62773 communique (the 2nd page～the 3rd page, Fig. 1)
Summary of the invention
In the induction heating cooking instrument of recording at patent documentation 1, so that input electric power becomes constant mode, the driving frequency of control inverter, changes according to its controlled quentity controlled variable that (Δ f) has judged the variations in temperature of heating object.But, existing according to the material of heating object, (Δ f) becomes small, and cannot survey the such problem of variations in temperature of heating object in the controlled quentity controlled variable variation of driving frequency.
In the temperature-detecting device of the induction heating cooking instrument of recording at patent documentation 2, there are the following problems: in the case of the material of heating object has changed, according to the driving frequency of inverter, likely input current becomes excessive, and inverter becomes high temperature and destroys.
The present invention completes in order to solve problem as described above, and though its object be to obtain a kind of material of heating object be what and can both survey the induction heating cooking instrument of the variations in temperature of heating object.In addition, obtain a kind of high induction heating cooking instrument of reliability of the increase that has suppressed input current.
Induction heating cooking instrument of the present invention, is characterized in that, possesses: heater coil, carries out induction heating to heating object; Drive circuit, to described heater coil supply high frequency electric power; Load identifying unit, carries out the load determination processing of described heater coil; And control part, control the driving of described drive circuit, control the High frequency power that described heater coil is supplied with, described control part is according to the result of determination of described load identifying unit, described drive circuit is driven, under the state of driving frequency of having fixed described drive circuit, obtain to the variable quantity of per stipulated time of at least one party in the coil current flowing through in the input current of described drive circuit and described heater coil, according to the variable quantity of described per stipulated time, survey the variations in temperature of described heating object.
No matter what the material of the present invention's heating object is, can both survey the variations in temperature of heating object.In addition, the increase of input current can be suppressed, reliability can be improved.
Brief description of the drawings
Fig. 1 is the exploded perspective view that the induction heating cooking instrument of execution mode 1 is shown.
Fig. 2 is the figure that the drive circuit of the induction heating cooking instrument of execution mode 1 is shown.
Fig. 3 is that the load of the heating object of the relation based on heating coil current and input current in the induction heating cooking instrument of execution mode 1 is differentiated performance plot.
The correlation diagram of the relative driving frequency of input current when Fig. 4 is the variations in temperature of heating object of the induction heating cooking instrument of execution mode 1.
Fig. 5 is the figure that has amplified the part shown in the dotted line of Fig. 4.
Fig. 6 is the figure of the relation of driving frequency, temperature, input current and time that the induction heating cooking instrument of execution mode 1 is shown.
Fig. 7 is the figure that has amplified the part shown in the dotted line of Fig. 4.
Fig. 8 is the figure of the relation of driving frequency, temperature, input current and time that the induction heating cooking instrument of execution mode 1 is shown.
Fig. 9 is the figure that other drive circuit of the induction heating cooking instrument of execution mode 1 is shown.
Figure 10 is the figure of the relation of driving frequency, temperature, input current and time that the induction heating cooking instrument of execution mode 2 is shown.
Figure 11 is the figure that a part for the drive circuit of the induction heating cooking instrument of execution mode 3 is shown.
Figure 12 is the figure that an example of the driving signal of the half-bridge circuit of execution mode 3 is shown.
Figure 13 is the figure that a part for the drive circuit of the induction heating cooking instrument of execution mode 4 is shown.
Figure 14 is the figure that an example of the driving signal of the full-bridge circuit of execution mode 4 is shown.
Symbol description
1: the first heating gate; 2: the second heating gates; 3: the three heating gates; 4: top board; 5: heating object; 11: the first heating units; 11a: heater coil; 12: the second heating units; 13: the three heating units; 21: AC power; 22: DC power supply circuit; 22a: diode bridge; 22b: reactor; 22c: smmothing capacitor; 23: inverter circuit; 23a, 23b:IGBT; 23c, 23d: diode; 24a, 24b: resonating capacitor; 25a: input current detecting unit; 25b: coil current detecting unit; 30: temperature sensing unit; 40a～40c: operating portion; 41a～41c: display part; 42: reporting unit; 45: control part; 50: drive circuit; 100: induction heating cooking instrument; 11b: interior loop; 11c: exterior loop; 24c, 24d: resonating capacitor; 25c, 25d: coil current detecting unit; 231a, 231b, 232a, 232b, 233a, 233b:IGBT; 231c, 231d, 232c, 232d, 233c, 233d: diode.
Embodiment
Execution mode 1.
(structure)
Fig. 1 is the exploded perspective view that the induction heating cooking instrument of execution mode 1 is shown.
As shown in Figure 1, on the top of induction heating cooking instrument 100, there is the top board 4 of the heating objects 5 such as mounting pot.In top board 4, as the heating gate for heating object 5 being carried out to induction heating, possess the first heating gate 1, the second heating gate 2, the 3rd heating gate 3, with each heating gate accordingly, possess the first heating unit 11, the second heating unit 12, the 3rd heating unit 13, can carry out induction heating for each heating gate mounting heating object 5.
In present embodiment 1, at side left and right, the front of main body spread configuration the first heating unit 11 and the second heating unit 12, be provided with the 3rd heating unit 13 in the inboard substantial middle of main body.
In addition, the configuration of each heating gate is not limited to this.For example, also can be according to 3 heating gates of the transversely arranged configuration of linearity roughly.In addition, also can be configured to the first heating unit 11 center different from the position of the depth direction at the second heating unit 12 center.
The entirety of top board 4 forms by heat-resisting tempered glass, sintered glass ceramics etc. the material that infrared ray sees through, and the upper surface open periphery of induction heating cooking instrument 100 main bodys between be fixed to watertight state by rubber seal processed, encapsulant.In top board 4, heated perimeter (heating gate) coating, the printing etc. of Tong Guo Tu material accordingly with the first heating unit 11, the second heating unit 12 and the 3rd heating unit 13, has formed the circular pot position display that represents the rough mounting position of pot.
In the front of top board 4 side, as for setting firepower when heating object 5 is heated with the first heating unit 11, the second heating unit 12 and the 3rd heating unit 13, the input unit of cooking menu (heat up water pattern, fried pattern etc.), be provided with operating portion 40a, operating portion 40b and operating portion 40c (being sometimes generically and collectively referred to as below operating portion 40).In addition, near of operating portion 40, as reporting unit 42, be provided with and show the operate condition of induction heating cooking instrument 100, display part 41a, display part 41b and display part 41c from the input/content of operation of operating portion 40 etc.In addition, have for each heating gate be provided with the situation of operating portion 40a～40c and display part 41a～41c, for the heating gate situation etc. of setting operation portion 40 and display part 41 together, be not particularly limited.
Below top board 4 and the inside of main body, possess the first heating unit 11, the second heating unit 12 and the 3rd heating unit 13, each heating unit is made up of heater coil (not shown).
In the inside of the main body of induction heating cooking instrument 100, be provided with the drive circuit 50 of the heater coil supply high frequency electric power to the first heating unit 11, the second heating unit 12 and the 3rd heating unit 13 and for controlling the control part 45 of action of the induction heating cooking instrument entirety that comprises drive circuit 50.
In addition, the control part 45 in present embodiment forms " control part " and " load identifying unit " in the present invention.
Heater coil has the flat shape of circular, by circumferencial direction reel by be insulated tunicle metal arbitrarily (such as copper, aluminium etc.) form conductor wire form, by utilizing drive circuit 50 to each heater coil supply high frequency electric power, carry out induction heating action.
Fig. 2 is the figure that the drive circuit of the induction heating cooking instrument of execution mode 1 is shown.In addition, drive circuit 50 arranges for each heating unit, and its structure is identical.In Fig. 2, only illustrate 1 drive circuit 50.
As shown in Figure 2, drive circuit 50 possesses DC power supply circuit 22, inverter circuit 23 and resonating capacitor 24a.
Input current detecting unit 25a detects the electric current of inputting to DC power supply circuit 22 from AC power (source power supply) 21, and the voltage signal suitable with input current value outputed to control part 45.
DC power supply circuit 22 possesses diode bridge 22a, reactor 22b, smmothing capacitor 22c, is direct voltage by the AC voltage conversion of inputting from AC power 21, outputs to inverter circuit 23.
About inverter circuit 23, be the inverter of the so-called semi-bridge type that is connected in series with the output of DC power supply circuit 22 as IGBT23a, the 23b of switch element, as fly-wheel diode, diode 23c, 23d are connected in parallel with IGBT23a, 23b respectively.Inverter circuit 23 is transformed to the direct current power of exporting from DC power supply circuit 22 alternating electromotive force of the high frequency of 20kHz～50kHz left and right, is supplied to the resonant circuit being made up of heater coil 11a and resonating capacitor 24a.
By such formation, in heater coil 11a, flow through the high-frequency current of tens about A, the high frequency magnetic flux that produces by the high-frequency current by flowing through, carries out induction heating to the heating object 5 having loaded on the top board of just going up 4 of heater coil 11a.By being for example that the semiconductor forming forms by silicon, but can be also to have used the wide bandgap such as carborundum or gallium nitride based material semiconductor structure as IGBT23a, the 23b of switch element.
Coil current detecting unit 25b is connected between heater coil 11a and resonating capacitor 24a.Coil current detecting unit 25b test example, as the peak value of the electric current flowing through in heater coil 11a, outputs to control part 45 by the voltage signal suitable with the peak value of heating coil current.
Temperature sensing unit 30 is made up of for example thermistor, according to the heat that transfers heat to top board 4 from heating object 5, detecting temperature.In addition, be not limited to thermistor, also can use the transducer arbitrarily such as infrared ray sensor.
(action)
Next, the action of the induction heating cooking instrument 100 of execution mode 1 is described.
First, illustrate by utilizing firepower that operating portion 40 set to carry out the action of the situation of induction heating to the heating object 5 having loaded on the heating gate at top board 4.
If loaded heating object 5 on heating gate by user, and operating portion 40 instruction that starts (firepower input), control part 45 (load identifying unit) determination processing of loading are carried out heating.
Fig. 3 is that the load of the heating object of the relation based on heating coil current and input current in the induction heating cooking instrument of execution mode 1 is differentiated performance plot.
The material that becomes the heating object 5 (pot) of load herein, is roughly divided into the low resistance nonmagnetic substances such as the high resistance nonmagnetic substances such as the magnetic material such as iron, SUS430, SUS304 and aluminium, copper.
As shown in Figure 3, according to the material of the pot load having loaded on top board 4, the relation of coil current and input current is different.Control part 45 in advance in storage inside the relation of the coil current shown in Fig. 3 and input current is carried out to tabular and the load that obtains is judged form.By judging form at storage inside load, can form load identifying unit by cheap structure.
In load determination processing, control part 45 use loads are judged the specific drive inverter circuit 23 of use, from the output signal of input current detecting unit 25a, detect input current.In addition, meanwhile, control part 45 is from the output signal of coil current detecting unit 25b, magnetic test coil electric current.Control part 45 is judged form according to the load of the relation of the coil current detecting and input current and presentation graphs 3, judges the material of the heating object (pot) 5 having loaded.Like this, control part 45 (load identifying unit) is relevant according to input current and coil current, judges the material of the heating object 5 having loaded above heater coil 11a.
After load determination processing more than having carried out, control part 45 carries out the control action based on load result of determination.
In the situation that load result of determination is low resistance nonmagnetic substance, the induction heating cooking instrument 100 of present embodiment 1 can not heat, so 42 reports can not be heated to reporting unit, urges user to change pot.
In addition, even be in uncharge situation in load result of determination, also to reporting unit, 42 reports can not be heated, and urge user to load pot.
In load result of determination, be magnetic material or high resistance nonmagnetic substance in the situation that, these pots are the materials that can heat with the induction heating cooking instrument of present embodiment 1 100, so control part 45 determines the driving frequency corresponding with the pot material of having judged.This driving frequency is made as the frequency higher than resonance frequency, so that input current can not become is excessive.About the decision of this driving frequency, can be by reference example as decided with the material of heating object 5 and the form etc. of setting the frequency that firepower is corresponding.
The fixing determined driving frequency of control part 45, drives inverter circuit 23, starts induction heating action.In addition, fixing under the state of driving frequency, the duty ratio of the switch element of inverter circuit 23 (ON (conducting) OFF (disconnection) ratio) also becomes the state of having fixed.
The correlation diagram of the relative driving frequency of input current when Fig. 4 is the variations in temperature of heating object of the induction heating cooking instrument of execution mode 1.In Fig. 4, characteristic when fine rule is heating object 5 (pot) for low temperature, thick line is the characteristic of heating object 5 during for high temperature.
As shown in Figure 4, the reason that characteristic changes according to the temperature of heating object 5 is, the resistivity of heating object 5 rising due to temperature rise, and magnetic susceptibility reduction, thus the magnetic coupling of heater coil 11a and heating object 5 changes.
In the control part 45 of the induction heating cooking instrument 100 of present embodiment 1, determine, for driving frequency, to fix this driving frequency and carry out control inverter circuit 23 by become the frequency that maximum frequency is high than the input current shown in Fig. 4.
Fig. 5 is the figure that has amplified the part shown in the dotted line of Fig. 4.
If driving frequency corresponding to the fixing pot material with having judged in above-mentioned load determination processing carried out control inverter circuit 23, along with heating object 5 becomes high temperature from low temperature, input current value (operating point) under this driving frequency is changed to a B from an A, follow the temperature rise of heating object 5, input current reduces gradually.
Now, control part 45, under the state of driving frequency of having fixed inverter circuit 23, is obtained the variable quantity (time variation) of per stipulated time of input current, according to the variable quantity of this per stipulated time, surveys the variations in temperature of heating object 5.
Therefore,, no matter what the material of heating object 5 is, can both survey the variations in temperature of heating object 5.In addition, can be by the variation of input current, survey the variations in temperature of heating object 5, so than temperature sensor etc., detecting temperature changes at high speed.
In addition, judge the material of the heating object 5 having loaded above heater coil 11a, according to the material of heating object 5, determine the driving frequency of inverter circuit 23, by this driving frequency, inverter circuit 23 is driven.Therefore, can be by the driving frequency corresponding with the material of heating object 5, fixing inverter circuit 23 and driving, can suppress the increase of input current.Therefore, the high temperature of inverter circuit 23 can be suppressed, reliability can be improved.
(pattern 1 of heating up water)
Next, illustrate by operating portion 40, selected the action of the situation of the pattern of heating up water of the action of heating up water of the water of putting into heating object 5 as cooking menu (pattern).
Similarly, the determination processing of loading, determines the driving frequency corresponding with the pot material of having judged for control part 45 and above-mentioned action, and fixing determined driving frequency, drives inverter circuit 23, implements induction heating and moves.Then, control part 45 has seethed with excitement by the time variation judgement of input current.By Fig. 6, elapsed time while carrying out the heating up water of water and the variation of each characteristic are described herein.
Fig. 6 is the figure of the relation of driving frequency, temperature, input current and time that the induction heating cooking instrument of execution mode 1 is shown.In Fig. 6, show elapsed time while having carried out heating up water at the interior input water of heating object 5 and the variation of each characteristic, Fig. 6 (a) illustrates driving frequency, and Fig. 6 (b) illustrates temperature (water temperature), and Fig. 6 (c) illustrates input current.
As shown in Fig. 6 (a), fixed drive frequency is carried out the control of inverter circuit 23.As shown in Fig. 6 (b), the temperature (water temperature) of heating object 5 is until boiling is risen gradually, if seethed with excitement, temperature becomes constant.As shown in Fig. 6 (c), according to the rising of the temperature of heating object 5, input current reduces gradually, and constant if water boiling and temperature become, input current also becomes constant., constant if input current becomes, water seethes with excitement and has heated up water.
Thus, control part 45 in present embodiment is under the state of driving frequency of having fixed inverter circuit 23, the variable quantity (time variation) of obtaining per stipulated time of input current, in the case of the variable quantity of this per stipulated time becomes below setting, is judged as and has heated up water.
In addition, about the information of setting, both can set control part 45 in advance, also can be from operating portion 40 inputs such as grade.
Then, the meaning of having heated up water is reported in control part 45 operation report unit 42.Herein, as reporting unit 42, the demonstration of having seethed with excitement in display part 41 etc. or use loud speaker (not shown) with sound, user to be reported, its mode is not particularly limited.
As described above, set water heat up water action heat up water in pattern, fix under the state of driving frequency of inverter circuit 23, obtain the variable quantity of per stipulated time of input current, in the time that the variable quantity of this per stipulated time becomes below setting, report the meaning of having heated up water by reporting unit 42.
Therefore, having heated up water of water can be promptly reported, induction heating cooking instrument easy to use can be obtained.
(pattern 2 of heating up water)
Next, other control action of having selected the situation of the pattern of heating up water by operating portion 40 is described.
Similarly, the determination processing of loading, determines the driving frequency corresponding with the pot material of having judged for control part 45 and above-mentioned action, and fixing determined driving frequency, drives inverter circuit 23, implements induction heating and moves.Then, control part 45 changed by the time of input current, and judgement has been seethed with excitement.
And then, the variable quantity of per stipulated time that control part 45 has been obtained under the state of driving frequency of having fixed inverter circuit 23 becomes below setting, remove the fixing of driving frequency, make the driving frequency of inverter circuit 23 variable, make the High frequency power of heater coil 11a supply variable.The details of such action is described by Fig. 7, Fig. 8.
Fig. 7 is the figure that has amplified the part shown in the dotted line of Fig. 4.
Fig. 8 is the figure of the relation of driving frequency, temperature, input current and time that the induction heating cooking instrument of execution mode 1 is shown.In Fig. 8, elapsed time when being illustrated in the interior input water of heating object 5 and having carried out heating up water and the variation of each characteristic, Fig. 8 (a) illustrates driving frequency, and Fig. 8 (b) illustrates temperature (water temperature), and Fig. 8 (c) illustrates input current.
With the action of the above-mentioned pattern 1 of heating up water similarly, if fixed drive frequency and start heating (Fig. 8 (a)), the temperature of heating object 5 (water temperature) rises gradually until seethe with excitement (Fig. 8 (b)).In the control of fixing this driving frequency, as shown in Figure 7, the input current value (operating point) under this driving frequency is changed to a B from an E, follows the temperature rise of heating object 5, and input current reduces gradually.
If it is constant that water boiling and temperature become, input current also becomes constant (Fig. 8 (c)).Thus, at time t1, the variable quantity that control part 45 is judged to be per stipulated time of input current becomes below setting, is judged as and has heated up water.
Next, control part 45 is removed the fixing of driving frequency, makes the driving frequency of inverter circuit 23 increase, thereby reduces input current, and the High frequency power (firepower) that heater coil 11a is supplied with is reduced.Now, make firepower reduce even if improve driving frequency, temperature also reduces hardly, so as shown in Figure 7, operating point moves (variation) to some C from a B.
Then, control part 45 is fixed the driving frequency of inverter circuit 23 again, by the firepower having reduced, continues heating.
In the case of heating up water (boiling of water), though by firepower improve required more than, water temperature also can not become more than 100 DEG C, so make firepower reduce even if improve driving frequency, also can keep water temperature.
Like this, in the case of the variable quantity of per stipulated time of input current becomes below setting, due to the driving of control inverter circuit 23, and reduce the High frequency power that heater coil 11a is supplied with, realize energy-saving so can suppress input electric power.
In addition, at time t1, control part 45 improves to the driving frequency of inverter circuit 23, and by reporting unit 42, user's report has been heated up water.In addition, about the report to user, both can improve before driving frequency, also can be after improving driving frequency.
Heated up water by quilt report, user drops into cooking material to heating object 5 (pot) sometimes.Herein, to describe to the interior situation that has dropped into cooking material of heating object 5 as example at time t2.
If at time t2, to the interior cooking material that dropped into of heating object 5,, as shown in Fig. 8 (b), the temperature of heating object 5 reduces.Reducing about this temperature, is for example as frozen food low temperature at the cooking material having dropped into, reduction more significantly.In addition, follow this temperature to reduce, as shown in Fig. 8 (c), input current sharply increases.
Now, as shown in Figure 7, operating point moves (variation) to some D from a C.
The variable quantity of per stipulated time that control part 45 has been obtained under the state of driving frequency of having fixed inverter circuit 23 become the 2nd more than setting, be judged as that temperature reduces (time t3) owing to carrying out filling action that food materials drop into action, water etc.
In addition, about the information of the 2nd setting, both can set control part 45 in advance, also can be from operating portion 40 inputs such as grade.
Then, at time t3, control part 45 is removed the fixing of driving frequency, the driving frequency of inverter circuit 23 is reduced, thereby input current is increased, and the High frequency power (firepower) that heater coil 11a is supplied with is increased.Thus, as shown in Figure 7, operating point moves (variation) to some E from a D.
Then, control part 45 is fixed the driving frequency of inverter circuit 23 again, by the firepower having increased, continues heating.
At time t3, under the state of low temperature, make driving frequency reduce, so input current further rises, but follow the rising of temperature, input current reduces (Fig. 8 (b), (c)) gradually.Now, as shown in Figure 7, operating point moves (variation) to some B from an E.
Thus, at time t4, the variable quantity that control part 45 is judged to be per stipulated time of input current becomes below setting, is again judged as and has heated up water.
Next, control part 45 is removed the fixing of driving frequency, makes the driving frequency of inverter circuit 23 again increase, thereby input current is reduced, and the High frequency power (firepower) that heater coil 11a is supplied with is reduced.After, above-mentioned action repeatedly, until heat the operation that stops (pattern of heating up water finishes) from operating portion 40.
By such action, the operating point of Fig. 7 is according to the ordinal shift (variation) of an an an E → B → C.
As described above, the variable quantity of per stipulated time of having obtained under the state of driving frequency of having fixed inverter circuit 23 become the 2nd more than setting, remove the fixing of driving frequency, the driving of control inverter circuit 23, the High frequency power that heater coil 11a is supplied with is increased, thereby the temperature that can promptly survey heating object 5 reduces and firepower is increased, can realize the short time cooking.In addition, by realizing the short time cooking, can be easy to use, can realize energy-saving.
In addition, for example, after boiling while having dropped into food materials, while having carried out the filling of water, if controlled the in the situation that of fixed drive frequency, exist and cannot obtain fully adding of food materials (water) to hanker required firepower, cooking length of time extends and usability variation, and the problem of the use electric power amount of entirety increase.
In addition, in the above description, narrated by changing driving frequency and controlled the mode of firepower, but also can use the duty ratio (ONOFF ratio) of the switch element by changing inverter circuit 23 to control the mode of firepower.
(fried pattern)
Next, the action of carrying out the oil in heating object 5 to be heated to fried when cooking of set point of temperature is described.
In the situation that oil is heated, different from the boiling of water, even fixed drive frequency and Sustainable Control, it is constant that the variation of input current can not become, and the temperature of oil continues to rise, and in the worst case, has oil possibility on fire.
In the present embodiment, as shown in Figure 2, by and with using the detection of the thermistor of the temperature of surveying heating object 5, variable quantity that infrared ray sensor equitemperature probe unit 30 is surveyed input current and utilizing the temperature sensing of temperature sensing unit 30, realize and suppressed the oily high induction heating cooking instrument of overheated reliability.
If by operating portion 40, select fried pattern as cooking menu (pattern), control part 45 and the above-mentioned determination processing of similarly loading, decision is suitable for the driving frequency of the material of heating object 5, and fixing determined driving frequency is carried out induction heating action.
In addition, by adding the value of the input current of hankering and output to control part 45 by the temperature that temperature sensing unit 30 has been surveyed, control part 45 can storing temperature and the relation of input current.
If the temperature of having been surveyed by temperature sensing unit 30 reaches the temperature (set point of temperature) that is suitable for the fried cooking, control part 45 is removed the fixing of driving frequency, to keep the mode of its temperature, makes driving frequency increase gradually and firepower is reduced.Now, in the time making driving frequency increase gradually, with by control part 45 storage change driving frequency simultaneously, the temperature of storing the value of the input current being detected by input current detecting unit 25a and having been surveyed by temperature sensing unit 30 with control part 45.
Control part 45 reports that to user the preheating of the fried cooking completes by reporting unit 42, and again fix the driving frequency of inverter circuit 23, by the firepower having reduced, continues heating.In addition, about the report to user, both can improve before driving frequency, also can be after improving driving frequency.
If after having reported that preheating completes, drop into food materials by user to heating object 5, the temperature of oil reduces.Frozen food at the food materials that dropped into, large with oily temperature difference, so if the amount of the food materials that dropped into is many, oil temperature sharply reduces.
The variable quantity of the input current that control part 45 has been obtained under the state of driving frequency of having fixed inverter circuit 23 or per stipulated time of coil current become the 3rd more than setting, the driving of control inverter circuit 23, increases the High frequency power that heater coil 11a is supplied with.
In addition, about the information of the 3rd setting, both can set control part 45 in advance, also can be from operating portion 40 inputs such as grade.
As described above, in the time that the detecting temperature of temperature sensing unit 30 has exceeded set point of temperature, the High frequency power that heater coil 11a is supplied with is reduced, the variable quantity of per stipulated time that obtained under the state of driving frequency of having fixed inverter circuit 23, input current become the 3rd more than setting, the driving of control inverter circuit 23, increases the High frequency power that heater coil 11a is supplied with.Therefore, can suppress oily temperature and reduce, keep being suitable for the temperature of the fried cooking, so can obtain the induction heating cooking instrument easy to use of the time that has shortened the fried cooking.
In addition, only by for example thermistor, infrared ray sensor equitemperature probe unit 30 have been surveyed temperature in the situation that, there is the problem postponing in the detection of the oily variations in temperature while existing food materials to drop into.In the present embodiment, the input current under the fixing control of driving frequency sharply changes, so by surveying the variable quantity of input current, can survey oily temperature and reduce.
(structure example of other drive circuit)
Next, the example that has used other drive circuit is described.
Fig. 9 is the figure that other drive circuit of the induction heating cooking instrument of execution mode 1 is shown.
Drive circuit 50 shown in Fig. 9 is the structures of the structure shown in Fig. 2 having been added to resonating capacitor 24b.In addition, other structure is identical with Fig. 2, to adding prosign with a part.
As mentioned above, form resonant circuit by heater coil 11a and resonating capacitor, so by the required maximum fire (maximum input electric power) of induction heating cooking instrument, determine the electric capacity of resonating capacitor.In the drive circuit 50 shown in Fig. 9, by resonating capacitor 24a and the 24b of being connected in parallel, can make electric capacity separately become half, even in the situation that having used 2 resonating capacitors, also can obtain cheap control circuit.
In addition, by coil current detecting unit 25b being disposed to the resonating capacitor 24a side in the resonating capacitor being connected in parallel, the electric current flowing through in coil current detecting unit 25b becomes the half of the electric current flowing through in heater coil 11a, so can use the coil current detecting unit 25b of small-sized/little electric capacity, small-sized and cheap control circuit can be obtained, cheap induction heating cooking instrument can be obtained.
Execution mode 2.
Figure 10 is the figure of the relation of driving frequency, temperature, input current and time that the induction heating cooking instrument of execution mode 2 is shown.In Figure 10, elapsed time when being illustrated in the interior input water of heating object 5 and having carried out heating up water and the variation of each characteristic, Figure 10 (a) illustrates driving frequency, Figure 10 (b) illustrates temperature (end temperature of heating object 5), and Figure 10 (c) illustrates input current.
(mode 3 of heating up water)
Other control action of having selected the situation of the pattern of heating up water by operating portion 40 is described.
Similarly, the determination processing of loading, determines the driving frequency corresponding with the pot material of having judged for control part 45 and the action of having narrated in execution mode 1, and fixing determined driving frequency, drives inverter circuit 23, implement induction heating and move.Then, control part 45 changed by the time of input current, and judgement has been seethed with excitement.
And then, the variable quantity of per stipulated time that control part 45 has been obtained under the state of driving frequency of having fixed inverter circuit 23 becomes below setting, remove the fixing of driving frequency, make the driving frequency of inverter circuit 23 variable, make the High frequency power of heater coil 11a supply variable.By Figure 10, the details of such action is described.
With the action of the above-mentioned pattern 1,2 of heating up water similarly, if fixed drive frequency and started heating (Figure 10 (a)), the end temperature of heating object 5 rises gradually until the water boiling (Figure 10 (b)) in heating object 5.In the control of fixing this driving frequency, follow the temperature rise of heating object 5, input current reduces gradually.
If it is constant that water boiling and temperature become, input current also becomes constant (Figure 10 (c)).Thus, at time t1, the variable quantity that control part 45 is judged to be per stipulated time of input current becomes below setting, is judged as and has heated up water.
Next, control part 45 is removed the fixing of driving frequency, makes the driving frequency of inverter circuit 23 increase, thereby reduces input current, and the High frequency power (firepower) that heater coil 11a is supplied with is reduced.Now, make firepower reduce even if improve driving frequency, temperature also reduces hardly.Then, control part 45 is fixed the driving frequency of inverter circuit 23 again, by the firepower having reduced, continues heating.
In the case of heating up water (boiling of water), though by firepower bring up to required more than, water temperature also can not become more than 100 DEG C, so make firepower reduce even if improve driving frequency, also can keep water temperature.
Like this, in the case of the variable quantity of per stipulated time of input current becomes below setting, due to the driving of control inverter circuit 23, and reduce the High frequency power that heater coil 11a is supplied with, realize energy-saving so can suppress input electric power.
In addition, at time t1, control part 45 improves to the driving frequency of inverter circuit 23, and by reporting unit 42, user's report has been heated up water.In addition, about the report to user, both can improve before driving frequency, also can be after improving driving frequency.
Even if reporting heated up water in the situation that, user also places sometimes as former state, water constantly boiling.Herein, with at time t2, the vaporized situation of water in heating object 5 is example explanation.
The in the situation that of having water in heating object 5, the temperature of heating object 5 (temperature in the bottom of a pan) is roughly equal to water temperature or passes with the temperature higher a little than water temperature.,, in the boiling of water, the temperature constant of heating object 5 is approximately 100 DEG C.
If at time t2, the water evaporation in heating object 5, the temperature of heating object 5 sharply rises, and follows the rising of the temperature of heating object 5, and as shown in Figure 10 (c), input current sharply reduces.
The variable quantity (reducing amount) of per stipulated time that control part 45 has been obtained under the state of driving frequency of having fixed inverter circuit 23 becomes in the 4th more than setting situation (reduced the 4th more than setting situation), is judged as evaporation of water (time t3).
In addition, about the information of the 4th setting, both can set control part 45 in advance, also can be from operating portion 40 inputs such as grade.
Then,, at time t3, control part 45 stops to heater coil 11a supply high frequency electric power (firepower).Now, control part 45 is reported evaporation of water by reporting unit 42 to user.
As described above, the reducing amount (variable quantity) of per stipulated time of having obtained under the state of driving frequency of having fixed inverter circuit 23 becomes in the 4th more than setting situation (reduced the 4th more than setting situation), remove the fixing of driving frequency, to stop the mode control of driving of inverter circuit 23, stop to heater coil 11a supply high frequency electric power, thereby can suppress the sharply rising of the temperature of heating object 5, can obtain safe induction heating cooking instrument.In addition, by reporting evaporation of water to user, fail safe can be further improved, induction heating cooking instrument easy to use can be obtained.
In addition, for example, even in the case of the thermistor of contact, contactless infrared ray sensor are used as temperature sensing unit 30, also can survey evaporation of water, but be difficult to the variations in temperature sharply of the heating object 5 that instantaneous detection and evaporation of water accompany, the danger (problem) that exists the temperature of heating object 5 sharply to rise.
In addition, in the above description, narrated by changing driving frequency and controlled the mode of firepower, but also can use the duty ratio (ONOFF ratio) of the switch element by changing inverter circuit 23 to control the mode of firepower.
In addition, can also be combined in the each pattern having illustrated in above-mentioned execution mode 1 and 2.For example, can also become the pattern of the action of having combined the action of the pattern of heating up water 2 and the mode 3 of heating up water.
In addition, in above-mentioned execution mode 1 and 2, the example of surveying the variable quantity of the input current being detected by input current detecting unit 25a has been described, but also can replace input current and survey the variable quantity of the coil current being detected by coil current detecting unit 25b, also can survey this two side's of input current and coil current variable quantity.
In addition, in above-mentioned execution mode 1 and 2, the inverter circuit 23 of semi-bridge type is described, but can has been also the structure that has used inverter of bridge-type, a stone series resonance type etc.
And then, the mode that uses the relation of coil current and primary current in the load of pot material is judged has been described, but also can be by the mode of judging of load by the resonance voltage at two ends that detects resonating capacitor, the mode of load judgement does not have special requirement.
Execution mode 3.
In present embodiment 3, the details of the drive circuit 50 in above-mentioned execution mode 1 and 2 is described.
Figure 11 is the figure that a part for the drive circuit of the induction heating cooking instrument of execution mode 3 is shown.In addition, in Figure 11, only illustrate the structure of a part for the drive circuit 50 of above-mentioned execution mode 1 and 2.
As shown in figure 11, inverter circuit 23 possesses 1 group and is included in 2 switch elements (IGBT23a, 23b) of being connected in series between positive and negative busbar and the diode 23c being connected respectively with this switch element, the branch of 23d anti-parallel connection.
For IGBT23a and IGBT23b, carry out ONOFF driving by the driving signal of exporting from control part 45.
Control part 45 makes IGBT23b become OFF state during making IGBT23a become ON, makes IGBT23b become ON state during making IGBT23a become OFF, and output alternately becomes the driving signal of ONOFF.
Thus, form by IGBT23a and IGBT23b the half-bridge inverter that drives heater coil 11a.
In addition, form " the half-bridge inverter circuit " in the present invention by IGBT23a and IGBT23b.
Control part 45, according to dropping into electric power (firepower), to the driving signal of IGBT23a and IGBT23b input high frequency, is adjusted and is added thermal output.About the driving signal to IGBT23a and IGBT23b output, variable in the scope of the high driving frequency of the resonance frequency of the load circuit than being formed by heater coil 11a and resonating capacitor 24a, so that the mode control that the voltage that the current ratio flowing through in load circuit applies to load circuit is crossed with the phase flow postponing.
Next, the control action that utilizes the driving frequency of inverter circuit 23 and the input electric power (firepower) of duty ratio is described.
Figure 12 is the figure that an example of the driving signal of the half-bridge circuit of execution mode 3 is shown.Figure 12 (a) is the example of the driving signal of the each switch under high firepower state.Figure 12 (b) is the example of the driving signal of the each switch under low firepower state.
Control part 45, to IGBT23a and the IGBT23b of inverter circuit 23, is exported the driving signal of the high frequency higher than the resonance frequency of load circuit.
By making the changeable frequency of this driving signal, the output increase and decrease of inverter circuit 23.
For example, if as shown in Figure 12 (a), driving frequency is reduced, the frequency of the high-frequency current of heater coil 11a being supplied with approaches the resonance frequency of load circuit, increases to the input electric power of heater coil 11a.
In addition, if as shown in Figure 12 (b), make driving frequency increase, the frequency of the high-frequency current of heater coil 11a being supplied with, away from the resonance frequency of load circuit, reduces to the input electric power of heater coil 11a.
And then, control part 45 can also be by together with utilizing the control of variable input electric power of above-mentioned driving frequency, make the IGBT23a of inverter circuit 23 and the variable duty ratio of IGBT23b, carry out the application time of the output voltage of control inverter circuit 23, control the input electric power to heater coil 11a.
In the situation that firepower is increased, increase the ratio (duty ratio) of the ON time (the OFF time of IGBT23b) of the IGBT23a in 1 cycle that drives signal, and 1 voltage application time width in the cycle is increased.
In addition, in the situation that firepower is reduced, reduce to drive the ratio (duty ratio) of the ON time (the OFF time of IGBT23b) of the IGBT23a in 1 cycle of signal, and 1 voltage application time width in the cycle is reduced.
In the example of Figure 12 (a), the situation of the situation (duty ratio is 50%) that the ratio of the ON time T 11a (the OFF time of IGBT23b) of IGBT23a that drives in 1 cycle T 11 of signal and the OFF time T 11b (the ON time of IGBT23b) of IGBT23a of illustrating is identical.
In addition, in the example of Figure 12 (b), the situation of the situation (duty ratio is 50%) that the ratio of the ON time T 12a (the OFF time of IGBT23b) of IGBT23a that drives in 1 cycle T 12 of signal and the OFF time T 12b (the ON time of IGBT23b) of IGBT23a of illustrating is identical.
When the variable quantity of control part 45 per stipulated time that illustrated in above-mentioned execution mode 1 and 2, that obtain input current (or coil current), under the state of driving frequency of having fixed inverter circuit 23, become the state that the duty ratio of the IGBT23a of inverter circuit 23 and IGBT23b has been fixed.
Thus, can, under the input electric power to heater coil 11a is constant state, obtain the variable quantity of per stipulated time of input current (or coil current).
Execution mode 4.
In present embodiment 4, the inverter circuit 23 that has used full-bridge circuit is described.
Figure 13 is the figure that a part for the drive circuit of the induction heating cooking instrument of execution mode 4 is shown.In addition, in Figure 13, only illustrate the difference with the drive circuit 50 of above-mentioned execution mode 1 and 2.
In present embodiment 4, be provided with 2 heater coils for 1 heating gate.About 2 heater coils, for example, diameter is different respectively, the configuration of concentric circles ground., heater coil little diameter is called to interior loop 11b herein, heater coil large diameter is called to exterior loop 11c.
In addition, the quantity of heater coil and configuration are not limited to this.For example, can be also the structure that configures multiple heater coils around the central heater coil of heating gate being disposed at.
Inverter circuit 23 possesses 3 groups of branches that are made up of with the diode being connected respectively with this switch element 2 switch elements (IGBT) that have been connected in series between positive and negative busbar anti-parallel connection.In addition, afterwards, be called community branch by 1 group in the branch of 3 groups, be called interior loop branch and exterior loop branch by other 2 groups.
Community branch is the branch being connected with interior loop 11b and exterior loop 11c, is made up of IGBT232a, IGBT232b, diode 232c and diode 232d.
Interior loop is the branch that has connected interior loop 11b with branch, is made up of IGBT231a, IGBT231b, diode 231c and diode 231d.
Exterior loop is the branch that has connected exterior loop 11c with branch, is made up of IGBT233a, IGBT233b, diode 233c and diode 233d.
About IGBT233a and the IGBT233b of the IGBT231a of branch and IGBT231b, exterior loop branch for the IGBT232a of community branch and IGBT232b, interior loop, carry out ONOFF driving by the driving signal of exporting from control part 45.
Control part 45 makes IGBT232b become OFF state during the IGBT232a that makes community branch becomes ON, makes IGBT232b become ON state during making IGBT232a become OFF, and output alternately becomes the driving signal of ONOFF.
Similarly, control part 45 output makes the IGBT233a of the IGBT231a of interior loop branch and IGBT231b, exterior loop branch and IGBT233b alternately become the driving signal of ONOFF.
Thus, by community branch and branch for interior loop, form the full-bridge inverter that drives interior loop 11b.In addition, by community branch and branch for exterior loop, form the full-bridge inverter that drives exterior loop 11c.
In addition, form " full-bridge inverter circuit " in the present invention by community branch and interior loop with branch.In addition, form " full-bridge inverter circuit " in the present invention by community branch and exterior loop with branch.
The load circuit being formed by interior loop 11b and resonating capacitor 24c be connected in community branch output point (tie point of IGBT232a and IGBT232b), and interior loop with between the output point (tie point of IGBT231a and IGBT231b) of branch.
The load circuit being formed by exterior loop 11c and resonating capacitor 24d be connected in community branch output point, and exterior loop with between the output point (tie point of IGBT233a and IGBT233b) of branch.
Interior loop 11b be circular the profile little heater coil of having reeled, configured exterior loop 11c in its periphery.
Detect the coil current flowing through in interior loop 11b by coil current detecting unit 25c.Coil current detecting unit 25c test example, as the peak value of the electric current flowing through in interior loop 11b, outputs to control part 45 by the voltage signal suitable with the peak value of heating coil current.
By coil current detecting unit 25d, detect the coil current flowing through in exterior loop 11c.Coil current detecting unit 25d for example detects the peak value of the electric current flowing through in exterior loop 11c, and the voltage signal suitable with the peak value of heating coil current outputed to control part 45.
Control part 45, according to dropping into electric power (firepower), is inputted the driving signal of high frequency to the switch element (IGBT) of each branch, adjust and add thermal output.
About the driving signal of the switch element output to community branch and interior loop use branch, variable in the scope of the high driving frequency of the resonance frequency of the load circuit than being formed by interior loop 11b and resonating capacitor 24c, so that the mode control that the voltage that the current ratio flowing through in load circuit applies to load circuit is crossed with the phase flow postponing.
In addition, about the driving signal of the switch element output to community branch and exterior loop use branch, variable in the scope of the high driving frequency of the resonance frequency of the load circuit than being formed by exterior loop 11c and resonating capacitor 24d, so that the mode control that the voltage that the current ratio flowing through in load circuit applies to load circuit is crossed with the phase flow postponing.
Next, the control action of the input electric power (firepower) of the phase difference each other of branch that utilizes inverter circuit 23 is described.
Figure 14 is the figure that an example of the driving signal of the full-bridge circuit of execution mode 4 is shown.
Figure 14 (a) is the example of the driving signal of the each switch under high firepower state and the energising of each heater coil timing.
Figure 14 (b) is the example of the driving signal of the each switch under low firepower state and the energising of each heater coil timing.
In addition, Figure 14 (a) and (b) shown in energising timing have relation with the potential difference of the output point (tie point of IGBT and IGBT) of each branch, represent the output point of relative interior loop branch and the output point of exterior loop branch, the lower state of output point of community branch with " ON ".In addition, represent the output point of relative interior loop branch and the output point of exterior loop branch with " OFF ", the state that the output point of community branch is higher and the state of same potential.
As shown in figure 14, control part 45, to IGBT232a and the IGBT232b of community branch, is exported the driving signal of the high frequency higher than the resonance frequency of load circuit.
In addition, the driving signal that control part 45 shifts to an earlier date phase place than the driving signal of community branch outputs to IGBT233a and the IGBT233b of the interior loop IGBT231a of branch and IGBT231b, exterior loop branch.In addition, the frequency of the driving signal of each branch is same frequency, and duty ratio is also identical.
To the output point (tie point of IGBT and IGBT) of each branch, according to the ONOFF state of IGBT and IGBT, high frequency ground switches positive bus-bar current potential or the negative busbar current potential of output as the output of DC power supply circuit.Thus, to interior loop 11b, apply the potential difference of the output point of community branch and the output point of interior loop branch.In addition, to exterior loop 11c, apply the potential difference of the output point of community branch and the output point of exterior loop branch.
Therefore, by making to use the phase difference of the driving signal of branch to increase and decrease to the driving signal of community branch with to interior loop branch and exterior loop, the high frequency voltage that interior loop 11b and exterior loop 11c are applied can be adjusted, the high frequency output electric current and the input current that in interior loop 11b and exterior loop 11c, flow through can be controlled.
In the situation that firepower is increased, increase 1 voltage application time width in the cycle by the phase place α increasing between branch.In addition, the upper limit of the phase place α between branch is the situation of anti-phase (180 ° of phase differences), and output voltage waveforms now becomes essentially rectangular ripple.
In the example of Figure 14 (a), illustrate phase place α between branch and be the situation of 180 °.In addition, the duty ratio that illustrates the driving signal of each branch is 50% situation, i.e. ON time T 13a in 1 cycle T 13 and the identical situation of ratio of OFF time T 13b.
In this case, the energising ON time width T14a of interior loop 11b, the exterior loop 11c in 1 cycle T 14 of driving signal and energising OFF time width T14b become identical ratio.
In the situation that firepower is reduced, than high firepower state, by the phase place α reducing between branch, 1 voltage application time width in the cycle is reduced.In addition, about the lower limit of the phase place α between branch, according to the relation of phase place of the electric current for example flowing through in load circuit when TURN ON (connection) etc., be set as can in switch element, not flowing through super-high-current and the level destroyed.
In the example of Figure 14 (b), illustrate the situation that has reduced the phase place α between branch than Figure 14 (a).In addition, the frequency of the driving signal of each branch and duty ratio are identical with Figure 14 (a).
In this case, the energising ON time width T14a of interior loop 11b, the exterior loop 11c in 1 cycle T 14 of driving signal becomes time corresponding to phase place α between branch.
Like this, can pass through branch's phase difference each other, control the input electric power (firepower) to interior loop 11b, exterior loop 11c.
In addition, in the above description, illustrate and made interior loop 11b and exterior loop 11c all add thermally operated situation, but also can stop the driving of interior loop branch or exterior loop branch, and only made the one party in interior loop 11b and exterior loop 11c heat action.
When the variable quantity of control part 45 per stipulated time that illustrated in above-mentioned execution mode 1 and 2, that obtain input current (or coil current), under the state of driving frequency of having fixed inverter circuit 23, become the state that the duty ratio of the switch element of the phase place α between branch and each branch has been fixed.In addition, other action is identical with above-mentioned execution mode 1 or 2.
Thus, can, under the input electric power to interior loop 11b, exterior loop 11c is constant state, obtain the variable quantity of per stipulated time of input current (or coil current).
In addition, in present embodiment 4, by coil current detecting unit 25c and coil current detecting unit 25d, detect respectively the coil current flowing through in the coil current that flows through in interior loop 11b and exterior loop 11c.
Therefore, in the situation that interior loop 11b and exterior loop 11c being heated moved, even if the one party in coil current detecting unit 25c and coil current detecting unit 25d is due to fault etc. and cannot magnetic test coil current value, also can be by the opposing party's detected value, the variable quantity of per stipulated time of magnetic test coil electric current.
In addition, control part 45 also can be obtained respectively the variable quantity of per stipulated time and the variable quantity of per stipulated time of the coil current that detected by coil current detecting unit 25d of the coil current being detected by coil current detecting unit 25c, use the large side in each variable quantity, the each judgement action of having carried out illustrating in above-mentioned execution mode 1 and 2.In addition, also can use the mean value of variable quantity separately, the each judgement action of having carried out illustrating in above-mentioned execution mode 1 and 2.
By carrying out such control, though the some accuracy of detection in coil current detecting unit 25c and coil current detecting unit 25d low, also can obtain more accurately the variable quantity of per stipulated time of coil current.
In addition, in above-mentioned execution mode 1～4, as an example of induction heating cooking instrument of the present invention, be illustrated taking IH cooking heater as example, but the invention is not restricted to this.The present invention can be applied to the electric rice cooker etc. that carries out cooking by induction heating and adopt the induction heating cooking instrument arbitrarily of induction heating mode.
Claims (14)
1. an induction heating cooking instrument, is characterized in that, possesses:
Heater coil, carries out induction heating to heating object;
Drive circuit, to described heater coil supply high frequency electric power;
Load identifying unit, carries out the load determination processing of described heater coil; And
Control part, controls the driving of described drive circuit, controls the High frequency power that described heater coil is supplied with,
Described control part
According to the result of determination of described load identifying unit, described drive circuit is driven,
Under the state of driving frequency of having fixed described drive circuit, obtain to the variable quantity of per stipulated time of at least one party in the coil current flowing through in the input current of described drive circuit and described heater coil,
According to the variable quantity of described per stipulated time, survey the variations in temperature of described heating object.
2. induction heating cooking instrument according to claim 1, is characterized in that,
Described control part
The variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit becomes below setting,
Control the driving of described drive circuit, make the High frequency power of described heater coil supply variable.
3. according to the induction heating cooking instrument described in claim 1 or 2, it is characterized in that,
Described control part
The variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit is removed the fixing of described driving frequency becoming below setting,
Improve the driving frequency of described drive circuit, the High frequency power that described heater coil is supplied with is reduced.
4. according to the induction heating cooking instrument described in any one in claim 1～3, it is characterized in that,
Described control part
The variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit increased the 2nd more than setting,
Control the driving of described drive circuit, the High frequency power that described heater coil is supplied with is increased.
5. according to the induction heating cooking instrument described in any one in claim 1～4, it is characterized in that,
Described control part
The variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit reduced the 4th more than setting,
To stop the mode control of driving of described drive circuit, stop to described heater coil supply high frequency electric power.
6. according to the induction heating cooking instrument described in claim 3 or 4, it is characterized in that,
Described control part, by making the driving frequency of described drive circuit or the variable duty ratio of switch element, makes the High frequency power of described heater coil supply variable.
7. according to the induction heating cooking instrument described in any one in claim 1～6, it is characterized in that,
Described control part
The variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit is removed the fixing of described driving frequency becoming below setting,
Make the driving frequency of described drive circuit increase, and the High frequency power that described heater coil is supplied with is reduced, the driving frequency of fixing described drive circuit,
The variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit increased the 2nd more than setting, remove the fixing of described driving frequency,
The driving frequency of described drive circuit is reduced, and the High frequency power that described heater coil is supplied with is increased, the driving frequency of fixing described drive circuit,
The variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit is removed the fixing of described driving frequency becoming below described setting,
Make the driving frequency of described drive circuit increase, and the High frequency power that described heater coil is supplied with is reduced, the driving frequency of fixing described drive circuit.
8. according to the induction heating cooking instrument described in any one in claim 1～6, it is characterized in that,
Described control part
The variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit is removed the fixing of described driving frequency becoming below setting,
Make the driving frequency of described drive circuit increase, and the High frequency power that described heater coil is supplied with is reduced, the driving frequency of fixing described drive circuit,
The variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit increased the 2nd more than setting, remove the fixing of described driving frequency,
The driving frequency of described drive circuit is reduced, and the High frequency power that described heater coil is supplied with is increased, the driving frequency of fixing described drive circuit,
The variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit is removed the fixing of described driving frequency becoming below described setting,
Make the driving frequency of described drive circuit increase, and the High frequency power that described heater coil is supplied with is reduced, the driving frequency of fixing described drive circuit,
The variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit reduced the 4th more than setting,
To stop the mode control of driving of described drive circuit, stop to described heater coil supply high frequency electric power.
9. according to the induction heating cooking instrument described in any one in claim 1～8, it is characterized in that possessing:
Operating portion, carries out the selection operation of pattern; And
Reporting unit,
Described control part
In the case of selected to set the heating up water pattern of the action of heating up water of water as described pattern, described drive circuit is driven,
Under the state of driving frequency of having fixed described drive circuit, obtain the variable quantity of per stipulated time of described input current or described coil current,
When the variable quantity of described per stipulated time of having obtained under the state of driving frequency of having fixed described drive circuit becomes below setting, the meaning of having heated up water by described reporting unit report.
10. according to the induction heating cooking instrument described in any one in claim 1～8, it is characterized in that possessing:
Operating portion, carries out the selection operation of pattern; And
Temperature sensing unit, surveys the temperature of described heating object,
Described control part
In the case of having selected as described pattern, oil is heated to the fried pattern of set point of temperature, described drive circuit is driven,
In the time that the detecting temperature of described temperature sensing unit has exceeded described set point of temperature, control the driving of described drive circuit, the High frequency power that described heater coil is supplied with is reduced, the driving frequency of fixing described drive circuit,
The variable quantity of per stipulated time that obtained under the state of driving frequency of having fixed described drive circuit, described input current or described coil current increased the 3rd more than setting,
Control the driving of described drive circuit, the High frequency power that described heater coil is supplied with is increased.
11. according to the induction heating cooking instrument described in any one in claim 1～10, it is characterized in that,
Described load identifying unit
According to being correlated with of described input current and described coil current, carry out the load determination processing of described heating object.
12. according to the induction heating cooking instrument described in any one in claim 1～11, it is characterized in that,
Described control part
Under the state of driving frequency of having fixed described drive circuit, be made as the state of the duty ratio of the switch element of having fixed described drive circuit.
13. according to the induction heating cooking instrument described in any one in claim 1～11, it is characterized in that,
Described drive circuit is made up of the full-bridge inverter circuit with at least 2 branches that 2 switch elements have been connected in series,
Described control part, under the state of driving frequency of described switch element of having fixed described full-bridge inverter circuit, is made as the state of the driving phase difference of the described switch element each other of having fixed described 2 branches and the duty ratio of described switch element.
14. according to the induction heating cooking instrument described in any one in claim 1～11, it is characterized in that,
Described drive circuit is made up of the half-bridge inverter circuit with the branch that 2 switch elements have been connected in series,
Described control part, under the state of driving frequency of described switch element of having fixed described half-bridge inverter circuit, becomes the state of the duty ratio of having fixed described switch element.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-057049 | 2012-03-14 | ||
| JP2012057049 | 2012-03-14 | ||
| PCT/JP2012/077943 WO2013136577A1 (en) | 2012-03-14 | 2012-10-30 | Induction heat cooker |
| JPPCT/JP2012/077943 | 2012-10-30 | ||
| PCT/JP2013/056917 WO2013137287A1 (en) | 2012-03-14 | 2013-03-13 | Induction heat cooker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104170524A true CN104170524A (en) | 2014-11-26 |
| CN104170524B CN104170524B (en) | 2016-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380014442.5A Active CN104170524B (en) | 2012-03-14 | 2013-03-13 | Induction heating cooking instrument |
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| Country | Link |
|---|---|
| EP (1) | EP2827679B1 (en) |
| JP (2) | JP6238888B2 (en) |
| CN (1) | CN104170524B (en) |
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| WO (2) | WO2013136577A1 (en) |
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| CN105684550A (en) * | 2013-10-24 | 2016-06-15 | 三菱电机株式会社 | Induction heating cooker |
| DE112013007556B4 (en) * | 2013-11-01 | 2023-02-16 | Mitsubishi Electric Corporation | induction cooker |
| JP6870083B2 (en) * | 2017-06-06 | 2021-05-12 | 三菱電機株式会社 | Cooker |
| KR102175633B1 (en) * | 2018-03-21 | 2020-11-06 | (주)쿠첸 | Heating device for evaluating suitability of object to be heated |
| CN111385922B (en) * | 2018-12-29 | 2022-04-01 | 佛山市顺德区美的电热电器制造有限公司 | Control method and device of electromagnetic heating appliance and electromagnetic heating appliance |
| EP3799524B1 (en) | 2019-09-30 | 2022-12-07 | Electrolux Appliances Aktiebolag | Method for determining properties of electrical current provided to an induction heating element |
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| CN114424674A (en) * | 2019-09-30 | 2022-04-29 | 伊莱克斯家用电器股份公司 | Method for determining a characteristic of a current supplied to an induction heating element |
| CN114424674B (en) * | 2019-09-30 | 2023-12-22 | 伊莱克斯家用电器股份公司 | Method for determining characteristics of current supplied to an induction heating element |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2573657T3 (en) | 2016-06-09 |
| CN104170524B (en) | 2016-01-27 |
| EP2827679A4 (en) | 2015-07-22 |
| WO2013136577A1 (en) | 2013-09-19 |
| JPWO2013137287A1 (en) | 2015-08-03 |
| EP2827679B1 (en) | 2016-04-27 |
| EP2827679A1 (en) | 2015-01-21 |
| JP6141492B2 (en) | 2017-06-07 |
| JP2016181518A (en) | 2016-10-13 |
| WO2013137287A1 (en) | 2013-09-19 |
| JP6238888B2 (en) | 2017-11-29 |
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