CN109219178A - Electromagnetic induction electric cooker - Google Patents
Electromagnetic induction electric cooker Download PDFInfo
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- CN109219178A CN109219178A CN201711381528.8A CN201711381528A CN109219178A CN 109219178 A CN109219178 A CN 109219178A CN 201711381528 A CN201711381528 A CN 201711381528A CN 109219178 A CN109219178 A CN 109219178A
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- Prior art keywords
- heating coil
- magnetic
- magnetic layer
- interior pot
- thickness
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/24—Warming devices
- A47J36/2483—Warming devices with electrical heating means
-
- 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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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Cookers (AREA)
Abstract
The present invention, which provides one kind and can reduce rice, boils to obtain non-uniform electromagnetic induction electric cooker.Comprising: removably be accommodated in the interior pot in main body；The heating coil (2) of the lower section of pot including configuration；With the inverter circuit board powered to heating coil (2), the bottom of pot (1) is formed with non-magnetic metal layer (13) inside, is formed with the different multiple magnetic layers (12) of thickness between pot and non-magnetic metal layer (13) inside.In addition, respectively thickness in the radial direction is different for multiple magnetic layers (12) on the basis of above structure.Moreover, the relationship of the thickness of multiple magnetic layers (12) meets t3 > t1 > t2.
Description
Technical field
The present invention relates to electromagnetic induction electric cookers.
Background technique
In recent years, the electric cooker using high-frequency electromagnetic induction device as the heating unit of the interior pot of heating electric rice cooker becomes
Mainstream.In the case where the electric cooker of electromagnetic induction method, interior pot is set to generate whirlpool electricity using the high frequency magnetic field that heating coil generates
Stream makes interior pot generate heat using the Joule heat that the electric current generates.Heating coil is set to the lower part of interior pot planarly.Due to adding
The induced magnetic field that heat coil generates concentrates on the upper part of heating coil, so the position of boiling is also locally concentrated.In part
It in the case where concentrating boiling, can boil upwards from Part portions, so temperature unevenness can integrally occur for rice, there are meals to boil not
Uniform project.
In order to solve such project, such as motion has note in Japanese Unexamined Patent Publication 2013-252168 bulletin (patent document 1)
The technology of load.Patent document 1 is disclosed such as flowering structure, comprising: is configured at the bottom surface of pot, is generated the flat of the induced magnetic field of heating kettle
The heating coil of face shape；Apply the inverter of high-frequency current to heating coil；With the control unit of control inverter, make pot
The not inner peripheral portion opposite with heating coil of bottom surface becomes convex form towards inner surface.In patent document 1, it is ensured that part collection
In boiling steep in the bottom surface of pot along the path that convex form moves, make to generate in heating coil upper part and the boiling gone upwards
Bubble disperses on the path that the convex form of the bottom surface along pot moves, and thus prevents moisture from concentrating on specific position.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2013-252168 bulletin
Summary of the invention
Subject to be solved by the invention
In patent document 1, the inner peripheral portion of the bottom surface of pot not opposite with heating coil is made to be formed as convex towards inner surface
Shape is dispersed steep boiling, but the induced magnetic field that heating coil generates can be concentrated near the inner peripheral portion of heating coil, so
Radial outside in the bottom of a pan face, the induced magnetic field that heating coil generates is smaller, is unable to get sufficient calorific capacity.Therefore, specially
The technology recorded in sharp document 1, which is difficult to eliminate rice, boils to obtain non-uniform problem.
Then, it is an object of the invention to solve the above subject, it one kind be provided can reduce rice and boil to obtain non-uniform electromagnetism
Incude electric cooker.
A technical solution to solve project
In order to achieve the above objectives, it is a feature of the present invention that including: the interior pot being removably accommodated in main body；Match
Set the heating coil in the lower section of above-mentioned interior pot；With the inverter circuit board powered to above-mentioned heating coil, in above-mentioned interior pot
Bottom is formed with non-magnetic metal layer, and the different multiple magnetic of thickness are formed between above-mentioned interior pot and above-mentioned non-magnetic metal layer
Property body layer.
The effect of invention
In accordance with the invention it is possible to change the fever distribution of interior pot, boil uneven so being capable of providing one kind and can reduce rice
Even electromagnetic induction electric cooker.
Detailed description of the invention
Fig. 1 is the structure chart that the electromagnetic induction heating electric rice cooker of the first embodiment of the present invention is cut down to a quarter.
Fig. 2 is the cross section structure figure of the bottom surface of the interior pot 1 of the first embodiment of the present invention.
Fig. 3 is the top view of the bottom of the interior pot 1 of the first embodiment of the present invention.
Fig. 4 is the figure for indicating the relationship of thickness and saturation flux of magnetic substance.
Fig. 5 is the figure of the heating coil current for indicating the first embodiment of the present invention and the action waveforms of magnetic flux.
The action diagram of magnetic flux path when Fig. 6 is the low current for indicating the first embodiment of the present invention.
The action diagram of magnetic flux path when Fig. 7 is the middle electric current for indicating the first embodiment of the present invention.
The action diagram of magnetic flux path when Fig. 8 is the high current for indicating the first embodiment of the present invention.
Fig. 9 is the block diagram of cooking of the first embodiment of the present invention.
Figure 10 is the inverter circuit for indicating the electromagnetic induction electric cooker of the first embodiment of the present invention and the pass of control circuit
The figure of system.
Figure 11 is the figure for indicating the action waveforms of IGBT41 and IGBT42 of the first embodiment of the present invention.
Figure 12 is the figure of the inverter driving dynamic frequency for indicating the first embodiment of the present invention and the relationship of input power.
Figure 13 is the sectional view for indicating the interior Cooker structure of the second embodiment of the present invention.
Figure 14 is the top view of the interior pot bottom of the third embodiment of the present invention.
Figure 15 is the sectional view for indicating the interior pot of the fourth embodiment of the present invention.
Figure 16 is the figure for indicating the relationship of ferritic magnetic field H, magnetic flux density B and relative permeability μ.
The movement of heating coil current and magnetic flux density when Figure 17 is the middle power for indicating the fourth embodiment of the present invention
The figure of waveform.
Figure 18 be indicate the fourth embodiment of the present invention it is high-power when heating coil current and magnetic flux density movement
The figure of waveform.
Figure 19 is the inverter circuit for indicating the electromagnetic induction electric cooker of the fifth embodiment of the present invention and the pass of control circuit
The figure of system.
Figure 20 is the figure of the IGBT52 for indicating the fifth embodiment of the present invention and the action waveforms of heating coil current.
Figure 21 is the figure of the inverter driving dynamic frequency for indicating the fifth embodiment of the present invention and the relationship of input power.
Specific embodiment
In the following, being illustrated with attached drawing to the embodiment of the present invention.
(embodiment 1)
Utilize the Detailed description of the invention first embodiment of the present invention.Fig. 1 is to add the electromagnetic induction of the first embodiment of the present invention
Thermoelectricity rice cooker cuts down the structure chart of a quarter.Bottomed cylindrical of the electromagnetic induction electric cooker 10 in upper opening (not shown)
Removably it is accommodated with interior pot 1 in main body, the top of main body and interior pot 1 is covered by lid.The lower section of pot 1 is configured with vortex shape inside
The heating coil 2 of winding is configured with rodlike ferrite 3 in the lower section of heating coil 2 radially.Match under ferrite 3
It is equipped with barricade 4.The lower section of barricade 4 is configured to the inverter circuit board 5 of 2 supply high frequency electric current of heating coil.By heating
The radiation field that coil 2 generates is shielded to prevent the malfunction of inverter circuit board 5 by barricade 4.In inverter circuit board 5
On be mounted with the semiconductor elements such as diode bridge, IGBT and cooling diode bridge, IGBT cooling fin, drive the electricity of IGBT
Source block.
Fig. 2 indicates the cross section structure figure of the bottom of the interior pot 1 of the first embodiment of the present invention.Interior pot 1 is by metal material structure
At.As metal material, interior pot 1 is made of the cladding material of such as aluminium and iron material.Interior pot 1 near interior surface layers by aluminium layer
11 form, and are formed on its surface the body layer 12 that is magnetic, are being formed with non-magnetic metal layer 13 near outer surface.Interior pot 1 is by aluminium layer
11, magnetic layer 12, the 3-tier architecture composition of non-magnetic metal layer 13.The lower section of pot 1 is configured with heating coil 2 inside.Interior pot 1
The good light weight of the preferred heat transfer of interior surface layers material, so in the present embodiment use aluminium.The preferred magnetic permeability of magnetic layer 12 height,
Magnetically saturated material is generated, so using ferrite in the present embodiment.Non-magnetic metal layer 13 near outer surface layer is to also serve as
The antirust of magnetic layer 12 and the material of heating part.As nonmagnetic metal such as the preferred aluminium of material for not allowing easy-to-rust, but aluminium
Resistance is small, is not suitable for electromagnetic induction heating, so using the AlSi for being added to silicon in aluminium in the present embodiment.AlSi is compared with aluminium
Resistance becomes larger, and is able to carry out induction heating and being formed thin the thickness of layer.
In Fig. 2, the magnetic layer 12 being formed between interior pot 1 and non-magnetic metal layer 13, the bottom of pot 1 is inside with thickness
The respective different thickness of t1, t2, t3 are formed.The relationship of the thickness of t1, t2, t3 is t3 > t1 > t2.In addition, the present embodiment
The bottom of interior pot 1 is formed as round, being arranged in order with t1, t2, t3 from interior pot center to radial outside of magnetic layer 12.And
And it is most thick positioned at the layer t3 of radial outside, layer t1 times of the central side of interior pot 1 is thick.That is, the bottom of pot 1 is formed with radial direction inside
The different magnetic layer of upper thickness.Moreover, magnetic layer 12 is configured to be located at the layer of the middle part of radial outside and interior 1 center of pot
T2 is most thin.Each layer of interior pot 1 is about 2mm degree with a thickness of, aluminium layer 11, and magnetic layer 12 is 0.1mm~0.5mm degree, non-
(AlSi layers) of magnetic metallic layers 13 are 0.05mm~0.2mm degree.The different layer of 3 thickness of formation in the present embodiment, but layer
Quantity is not limited to 3.The different magnetic layer of preferred thickness at least forms 2 or more (multiple).
Fig. 3 indicates the top view of the bottom of the interior pot 1 of the first embodiment of the present invention.As shown in figure 3, the bottom of interior pot 1
Since the thickness of magnetic layer 12 is different, the different pattern of concentric circles is formed.The pattern of magnetic layer 12 is circle, from radial direction
Act the third magnetism for being arranged in the first magnetic layer 12a of thickness t3, the second magnetic layer 12b of thickness t2, thickness t1 in outside
Body layer 12c.Different multiple magnetic layers (the first magnetic of respective thickness in the radial direction is formed in the bottom of circular interior pot 1
Property body layer 12a, the second magnetic layer 12b, third magnetic layer 12c).Moreover, being located at the first of radial outside in the present embodiment
Magnetic layer 12a forms thicker than being located at the second magnetic layer 12b, the third magnetic layer 12c of radially inner side.In addition, third
Magnetic layer 12c forms thicker than the second magnetic layer 12b.
Aluminium layer 11, magnetic layer 12, non-magnetic metal layer 13 are formed by the surface treatment such as plating or spraying plating.It is being formed
When the different magnetic layer 12 of thickness, change blows position or blows the time, or is formed using (masking) etc. is sheltered.
Fig. 4 indicates the thickness of magnetic substance and the relationship of saturation flux.The saturation flux of the ferromagnetic bodies such as iron is big, even if by thick
It is also big that degree does thin saturation flux.On the other hand, the saturation flux due to caused by the ferrite equal thickness as magnetic device changes
Greatly, so magnetic saturation region can be controlled by the thickness at the bottom of pot 1 in changing.
Fig. 5 indicates the heating coil current of the first embodiment of the present invention and the action waveforms of magnetic flux.Fig. 5 indicates inverter
The variation of the heating coil current and magnetic flux density of driving frequency 25kHz.In figure, saturation flux (t1) indicates the magnetic substance of Fig. 2
The saturation flux of the position of the t1 of layer 12, in addition, saturation flux (t2) indicates the saturation flux of the position of the t2 of magnetic layer 12.
As magnetic layer 12, using saturation flux with the ferrite of thickness change.The largest of about alternating current of 10A is flowed in coil.
The size of the magnetic flux and coil current that are represented by dashed line proportionally changes.
Fig. 6 indicates the magnetic flux path when low current of the first embodiment of the present invention.It is the full of Fig. 5 in low current region
With magnetic flux (t2) hereinafter, so all magnetic layers 12 have magnetic flux and pass through the magnetic layer of the bottom of a pan entirety without magnetic saturation
12, so the AlSi layer of pot entire surface integrally generates heat inside.
Fig. 7 indicates magnetic flux path when the middle electric current of the first embodiment of the present invention.When as middle Current Zone shown in fig. 5
When domain, since greatly than saturation flux (t2), so the region t2 of magnetic layer 12 causes magnetic saturation and magnetic flux density sharp drops
It is low.Magnetic saturation occurs in the region t2 of most thin magnetic layer 12 when middle power as shown in Figure 7 as a result, magnetic flux becomes not pass through.
Therefore, the fever on the AlSi layer on surface reduces, the AlSi layer fever on the surface in the region t1 and t3 of magnetic layer 12.
Fig. 8 shows the magnetic flux paths when high current of the first embodiment of the present invention.When the high current of Fig. 8, due to being more than
Saturation flux (t1), so the region t1, t2 magnetic saturation of magnetic layer 12, only the region t3 of magnetic layer 12 passes through magnetic flux.Cause
This, lSi layers of the surface A fever in the region t3 of magnetic layer 12.Electromagnetic induction inverter circuit is controlled by control circuit 45 like this
30 (Figure 10), make the size variation of heating coil current, as a result, generate heat changes in distribution and heating region can be made to disperse, so
It is able to suppress rice and boils unevenly.
Then an example by the present embodiment applied to step of cooking is illustrated with Fig. 9.Fig. 9 is the first reality of the invention
Apply the block diagram of cooking of example.Step of cooking is divided into water suction step, heating stepses, step of cooking rice over a slow fire.The starch of rice is outside the grain of rice
Side fills up the cell of central part, heats up if do not absorbed water, and becomes rice from the surface side of the grain of rice, so centre can be protected
Hold hard state.It is therefore preferable that in advance with water retting rice until the starch of central part all fully absorbs moisture.Usually as
Rice is set to absorb the time of moisture, it is generally desirable to which summer is 30 minutes, and winter is 60 minutes.But according to situation sometimes needs
It cooks in the short time.Then, the water suction step for making rice absorb moisture is provided in a short time in electric cooker.In short-term
Between so that rice is absorbed water, preferably be no more than starch gelatinization point (about 60 DEG C) at a high temperature of carry out, to heating coil 2 supply in electricity
Stream, will heat with middle power.After absorbing water step, it is transferred to heating stepses.It is hastily heated in heating stepses
To the fluidized state of water, promote the gelatinization of starch and cooked without a break so supply high current to heating coil 2, with it is high-power into
Row heating.At this point, the outer side bottom surface part in the region (region of the magnetic layer 12a of Fig. 3) of the t3 of interior pot 1, i.e. interior pot 1 carries out
Heating.Heating when high-power is local, but the exterior portion of pot 1 inside, and rice is with boiling bubble together along the side wall of interior pot 1
Rise, after the top for reaching interior pot 1, the center position of inside pot 1 is mobile.By the way that the movement is repeated, sent out in pot 1 inside
The convection current of raw rice, rice are integrally heated, and are able to suppress rice and are boiled unevenly.After heating stepses, it is transferred to step of cooking rice over a slow fire.
If only heating stepses, can be unable to fully be impregnated into inside in a large amount of moisture of rice remained on surface.Then, in order to pass through
It cooks rice over a slow fire step, so that the moisture on surface is impregnated into inside, heated with low-power.At this point, the bottom surface of interior pot 1 is integrally heated,
So the moisture distribution of rice can be made to become uniform.According to the present embodiment, can be made according to heating power (heating coil current)
Fever changes in distribution, can be realized the heating for the step that is suitble to cook.
Then the structure of the electromagnetic induction inverter circuit 30 for realizing these steps is illustrated.Figure 10 is to indicate this
The figure of the relationship of the inverter circuit and control circuit of the electromagnetic induction electric cooker of the first embodiment of invention.
The AC rectification supplied from power frequency supply 31 is direct current by rectification circuit 32, is output to electric current via filter circuit 33
Resonance inverter portion 34.Filter circuit 33 smooths the direct current after being rectified by rectification circuit 32.As filter circuit 33
Current resonance inverter 34 is connected between the node p of the positive terminal of output and the node n of negative terminal.It is inverse as high frequency
The current resonance inverter 34 for becoming device, by connecting resonance in the half-bridge circuit that IGBT41 and IGBT42 are connected in series
The heating coil 35 of circuit 36 and constitute.
The IGBT41 (the first thyristor) of upper arm is connect with diode D1 (first diode) inverse parallel, and
And it is connected in parallel with buffer condenser 43 (the first buffer condenser).
The IGBT42 (the second thyristor) of lower arm is connect to inverse parallel with diode D2 (the second diode), and
And it is connected in parallel with buffer condenser 44 (the second buffer condenser).Here, the tie point of IGBT41,42 are set as node a.
Cutting electric current when buffer condenser 43,44 is by IGBT41,42 shutdown carries out charge and discharge.Buffer condenser
43,44 capacitor is sufficiently large compared with the output capacitance between emitter with the collector of IGBT41,42.Therefore, it is applied when shutdown
Be added to IGBT41,42 voltage variation reduce, shutdown loss be suppressed.Current resonance inverter 34 is via filter circuit 33
It is supplied to DC current from rectification circuit 32, is converted to the alternating current of high frequency and output, to drive heating coil 35.
Resonance circuit 36 includes resonant capacitor 38,39 (the first and second resonant capacitors) and heating coil 35.It is saving
The series circuit of resonant capacitor 38,39 is connected between point p and node n.Connection resonant capacitor 38,39 node b with
Connect IGBT41,42 node a between, be connected with heating coil 35.The direction of the resonance current IL of heating coil 35 is, with from
The direction (arrow direction of Figure 16) that node a is gone to node b is positive.In addition, being provided between node a and node b for examining
Survey the current detector 37 of the electric current of heating coil 35.
Control circuit 45 includes: the driving circuit 47-1 for driving IGBT41；Drive the driving circuit 47-2 of IGBT42；And control
The control unit 48 of coil current processed.By driving signal circuit 46 occurs for driving circuit 47-1,47-2 to control.Control circuit
45 control current resonance inverters 34.
Then common heating movement is illustrated with Figure 11.Figure 11 indicates the first embodiment of the present invention
The figure of the action waveforms of IGBT41 and IGBT42.In mode M11, the IGBT41 of upper arm is shutdown, and the IGBT42 of lower arm is to lead
It is logical.The collector voltage of the IGBT41 of upper arm keeps specified value.The collector voltage of the IGBT42 of lower arm substantially 0V.
At this point, electricity is flowed in the path of 38, heating coil 35, IGBT42 from filter condenser C0 to resonant capacitor
Stream, from resonant capacitor 39 to heating coil 35, IGBT42 path in streaming current.Since the IGBT41 of upper arm turns off institute
It is not flowed with electric current.In mode M11, when control circuit 45 turns off IGBT42, it is transferred to mode M12.
In mode M12, the IGBT41 of upper arm and the IGBT42 of lower arm are shutdown.At this point, because accumulating in heating coil 35
Energy, from buffer condenser 43 to resonant capacitor 38, heating coil 35 path in streaming current, from heating coil
35 to buffer condenser 44, resonant capacitor 39 path in streaming current.At this point, the collector voltage of the IGBT42 of lower arm is slow
It is slow to rise, become zero voltage switch, switching losses become smaller.When the collector voltage (voltage of node a) of the IGBT42 of lower arm is super
When crossing the voltage of node p of positive terminal, it is transferred to mode M13.
In mode M13, diode D1 conducting, diode D1, resonant capacitor 38, heating coil 35 path in flow
Streaming current, from diode D1 to filter condenser C0, streaming current in the path of resonant capacitor 39, heating coil 35.Control
Circuit 45 processed is during the energization of diode D1 by the gate turn-on of the IGBT41 of upper arm.Current resonance inverter 34 is two
When becoming not streaming current in pole pipe D1, it is transferred to mode M14.
In mode M14, IGBT41 is had been turned on, so becoming zero voltage switch, does not generate switching losses.Because accumulation in
The energy of resonant capacitor 39, to resonant capacitor 38 to IGBT41, heating coil 35 path in streaming current, from
Filter condenser C0 to IGBT41, heating coil 35, resonant capacitor 39 path in streaming current.As a result, in heating coil
Energy accumulation in 35.In mode M14, when control circuit 45 turns off IGBT41, it is transferred to mode M15.
In mode M15, the IGBT41 of upper arm and the IGBT42 of lower arm are shutdown.Because accumulating in the energy of heating coil 35
Amount, in the streaming current in the path of 43, heating coil 35, resonant capacitor 39 from filter condenser C0 to buffer condenser,
From buffer condenser 44 to heating coil 35, resonant capacitor 39 path in streaming current.At this point, the collector electricity of IGBT41
Pressure slowly rises, and becomes zero voltage switch.
Then, the current potential of node p is charged in buffer condenser 43, when buffer condenser 44 is discharged, diode D2
Conducting, is transferred to mode M16.
In mode M16, because diode D2 be connected, diode D2, heating coil 35, resonant capacitor 39 path in
Streaming current, resonant capacitor 38, filter condenser C0, diode D2, heating coil 35 path in streaming current.Control
IGBT42 is connected during the energization of diode D2 for circuit 45.When becoming not streaming current in diode D2, turn again
Move on to mode M11.
By 6 kinds of movements of mode M11~M16 more than being repeated, the resonance of high frequency is flowed in heating coil 35
Electric current IL heats the interior pot 1 for the upside for being placed in heating coil 35.
Figure 12 is the figure of the inverter driving dynamic frequency for indicating the first embodiment of the present invention and the relationship of input power.Figure 12
Indicate the characteristic of the series resonance mode of the movement of above-mentioned circuit mode.In general, making inverter in the case where regulation power
Drive frequency variations act to carry out power control on resonance curve.By the way that the different magnetic of multiple thickness is arranged in the present embodiment
Property body layer, according to heating power, resonance frequency variation.As a result, frequency is when low-power with the movement of resonance curve 1, in middle function
Frequency is when rate with the movement of resonance curve 2, and frequency is when high-power with the movement of resonance curve 3.The magnetism such as iron are provided in pot 1 inside
In the case where metal layer, independently from the size with power, acted on such as 1 such line of resonance curve.Therefore, it is carrying out
In the case where power control, operating frequency range becomes larger.In addition, the maximum value of resonance curve is low, so being difficult to high-power.Separately
On the one hand, in the present embodiment, resonance curve changes with heating power, so acting on the operation curve shown in Figure 12, energy
Driven by inverter frequency range is enough set to narrow, maximum value also becomes larger, and can be realized the firepower bigger than the prior art.
The present embodiment from the description above is only changed by the way that the different magnetic layer of multiple thickness is arranged in heater wire
The size of the electric current flowed in circle 2, it will be able to change the heating part of interior pot 1, can easily be done the control for being suitble to cook
System.It boils unevenly moreover, being able to suppress rice when cooking, can be improved the taste of rice.
(embodiment 2)
Then, the second embodiment of the present invention is illustrated with Figure 13.Figure 13 is to indicate the second embodiment of the present invention
Interior Cooker structure sectional view.The difference is that, the thickness of magnetic layer 24 is continuously formed, in thickness with first embodiment
The part of degree variation forms rake.That is, magnetic layer 24 is formed in the different mode of radially thickness.Interior pot 1 it is innermost
Superficial layer is formed by aluminium layer 11, is formed on its surface the body layer 24 that is magnetic, and is being formed with non-magnetic metal layer 13 near outer surface.
Interior pot 1 is made of the 3-tier architecture of aluminium layer 11, magnetic layer 24, non-magnetic metal layer 13.
Magnetic layer 24 uses ferrite.It is used near the non-magnetic metal layer 13 of outer surface layer and is added to silicon in aluminium
AlSi。
Magnetic layer 24, the bottom of pot 1 is formed inside with the respective different thickness of thickness t1, t2, t3.The thickness of t1~t3
The relationship of degree is t3 > t1 > t2.In addition, magnetic layer 24 is matched from the center of interior pot 1 to radial outside with the sequence of t1, t2, t3
It sets.The thickness of t1 is tilted in a manner of going thickness reduction to the t2 for being located at radial outside from the center of interior pot 1.The thickness of t2 with from
T2 goes the increased mode of thickness to tilt to radial outside t3 is located at.Aluminium layer 11, magnetic layer 24, non-magnetic metal layer 13 pass through spray
The metals epitheliums such as plating are handled and are formed.In the different magnetic layer 24 of formation thickness, change blows position or blows the time
It is formed.
In the present embodiment, due to changing the thickness of t2, so giving low current, middle electric current, high current to heating coil 2
When, the part variation of heating.It is acted repeats with the content illustrated in Fig. 6, Fig. 7 and Fig. 8, so in this description will be omitted.
Second embodiment according to the present invention, is arranged magnetic layer 24 and tilts, and the thickness of magnetic layer 24 continuously becomes
Change, so the fever of pot 1 is distributed in capable of continuously being changed radially according to heating coil current, is able to suppress rice and boils not
Uniformly.
(embodiment 3)
Then, the third embodiment of the present invention is illustrated with Figure 14.Figure 14 is the interior of the third embodiment of the present invention
The top view of the bottom of pot 1.With being different in for first embodiment and second embodiment, make the thickness of magnetic layer in circumferential direction
On form differently.In Figure 10, magnetic layer 24,25 is fan formed on the bottom of pot 1 inside.These magnetic layers become magnetism
The structure that body layer 24 is thick, magnetic layer 25 is thin.Moreover, magnetic layer 24 and magnetic layer 25 that the thickness of magnetic layer is different
It alternately configures in the circumferential.By adopting such structure, fever distribution can be changed according to heating coil current.It is heating
In the state that coil current is low, without magnetically saturated region, magnetic flux interlinks in the entire surface of the bottom of a pan, the nonmagnetic metal on surface
(AlSi layers) fevers of layer 13.When heating coil current increases, magnetic saturation occurs for magnetic layer 25, and magnetic flux becomes not pass through, magnetic
It is logical only to interlink in magnetic layer 24, (AlSi layers) of non-magnetic metal layer 13 fevers on surface.Like this, according to heating coil current
Size, the fever changes in distribution in interior pot 1 can be realized uniform heating.
Third embodiment according to the present invention form differently the thickness of magnetic layer in the circumferential, so being capable of root
Change fever distribution in the circumferential according to heating coil current, promotes the convection current of the rice in circumferential direction, be able to suppress rice and boil unevenly.
(embodiment 4)
Then, the fourth embodiment of the present invention is illustrated with Figure 15~Figure 18.Figure 15 is to indicate the of the invention the 4th
The sectional view of the interior pot of embodiment.
It is different in first embodiment~3rd embodiment, is formed with not making the thickness change of magnetic layer 27.
Interior pot 1 is made of the 3-tier architecture of aluminium layer 11, magnetic layer 27, non-magnetic metal layer 13.Magnetic layer 27 uses ferrite.?
In the structure, the relationship of ferritic magnetic field H and magnetic flux density B and relative permeability μ are illustrated.
Figure 16 is the figure for indicating the relationship of ferritic magnetic field H, magnetic flux density B and relative permeability μ.In Figure 16, magnetic field H
In the relationship of magnetic flux density B, when applying magnetic field H from outside, because magnetic field is along initial magnetization curve magnetic flux density B in ferrite
Increase.Magnetic field H is increased up the no longer increased region magnetic flux density B and is known as saturation flux density Bs, and indicates the magnetism
The flowable peakflux density B of material.
On the other hand, in the relationship of magnetic field H and relative permeability μ, magnetic flux density B is relative to the increased region magnetic field H
In, relative permeability μ is dominated by the slope of magnetic flux density B and is increased.When magnetic flux density B is close to zone of saturation, magnetic flux density B
Slope reduce, relative permeability μ reduce.Moreover, magnetic saturation and magnetic forfeiture occurs, and opposite when magnetic field H becomes larger
Magnetic permeability μ is reduced to space permeability, i.e., 1.
The magnetic flux generated from heating coil 2, is the characteristic proportional to heating coil current.It is small in heating coil current
In the case of, magnetic saturation does not occur for magnetic layer 27, and the magnetic substance of 1 bottom of pot is entirely through magnetic flux inside, surface it is non magnetic
Metal layer 13A (AlSi) fever.
Figure 17 and Figure 18 indicates the variation of magnetic flux density when heating coil current increases.Figure 17 is to indicate of the invention
The figure of the action waveforms of heating coil current and magnetic flux density when the middle power of four embodiments.Figure 18 is to indicate of the invention
Four embodiments it is high-power when heating coil current and magnetic flux density action waveforms figure.
In Figure 17, magnetic saturation occurs near the peak value of heating coil current, magnetic flux density drastically reduces.Later, pass through
After peak point, as heating coil current reduces, magnetic saturation disappears, and magnetic flux density steeply rises.Moreover, with heating coil electricity
Stream reduces, and magnetic flux density also reduces.Moreover, in the heating coil current period in middle power, occur 4 big flux changes.
Induction heating flows eddy current by the way that flux change occurs in metal in a metal, so being increased by increasing flux change
Calorific value.
Figure 18 further indicates that the variation of magnetic flux density when heating coil current increases.As shown in figure 18, it is known that heating
The magnetic flux density of the middle current segment of coil current drastically reduces.After magnetic flux density reduces, magnetic saturation disappears, so magnetic flux density
It steeply rises.After magnetic flux density rises, the rising of heating coil current also slows down, and magnetic flux density is also slowly reduced, with heating
The decline magnetic flux density of coil current slowly rises.Then, after magnetic flux density rising, magnetic saturation occurs, magnetic flux density is sharply
It reduces.Later, magnetic saturation disappears, and magnetic flux density rises.After magnetic flux density rises, with the decline of heating coil current, magnetic flux
Density also reduces.8 big flux changes occur for heating coil current period when high-power.This is because according to Figure 16
Magnetic field and relative permeability relationship, when magnetic field increase when, relative permeability becomes smaller, thus magnetic flux density reduce become saturation
Below magnetic flux density.Like this, by the way that multiple changes of magnetic field occurs within the heating coil current period, as mentioned above due to whirlpool is electric
The increase of loss is flowed, the calorific value of interior pot 1 increases.
According to the present embodiment, the substantially uniform use of magnetic layer 27 iron oxygen is integrally formed to obtain in the bottom as pot 1 inside
Body considers the ferritic magnetic field H and magnetic flux density B to control heating coil current, makes to occur in the heating coil current period
Multiple changes of magnetic field, so calorific value caused by eddy current losses can be made to increase.Thereby, it is possible to substantially evenly heat interior pot
1 bottom is whole, is able to suppress rice and boils unevenly.
(embodiment 5)
Then the 5th embodiment is illustrated with Figure 19~Figure 21.5th embodiment is inverter unit and the control of Figure 10
The variation of unit processed.Figure 19 is the inverter circuit and control electricity for indicating the electromagnetic induction electric cooker of the fifth embodiment of the present invention
The figure of the relationship on road.
In Figure 19, electromagnetic induction inverter circuit 40 includes: that power frequency supply 31, rectification circuit 32, filter circuit 33, voltage are humorous
Inverter 50 of shaking and control circuit 54.
Then the connection relationship of each structure is illustrated.
Power frequency supply 31 is connect via rectification circuit 32 with filter circuit 33.Filter circuit 33 and voltage resonance inverter
50 connections.Filter circuit 33 is made of inductor L0 and filter condenser C0.Voltage resonance inverter 50 and resonance circuit 51
It is connected in series with IGBT52.IGBT52 is connect with diode D3 inverse parallel.Heating coil 35 and resonance electricity in resonance circuit 51
Container 53 is connected in parallel.By control unit 48, driving signal circuit 46, driving circuit 55 and comparison circuit occur for control circuit 54
56 are constituted.Control circuit 54 controls voltage resonance inverter 50.
Then common heating movement is illustrated with Figure 20.Figure 20 indicates the fifth embodiment of the present invention
The figure of IGBT52 and the action waveforms of heating coil current.Here, the sense of current of heating coil 35 is with arrow direction (from adding
The flow direction that heat coil 35 is gone to IGBT52) it is positive.
During mode M21 is the peak value from the shutdown of IGBT52 to the collector voltage of IGBT52.
In mode M21, when IGBT52 shutdown, the electric current for flowing through IGBT52 is cut off, because accumulating in heating coil 35
Energy, the streaming current in the path of heating coil 35 and resonant capacitor 53.At this point, the collector voltage of IGBT52 is sinusoidal
Hummock rise, becomes zero voltage switch (ZVS).
Mode M22 is during the collector voltage of IGBT52 becomes 0V from peak value.When the collector voltage of IGBT52 becomes
When for peak value, the electric current of heating coil 35 is negative from being just switched to, sense of current reversion, in resonant capacitor 53, heating coil
Streaming current in 35 path.
During mode M23 is the energization of diode D3.In mode M22, resonant capacitor 53 discharges, when the collection of IGBT52
When electrode voltage becomes 0V, diode D3 conducting, heating coil 35, filter condenser C0, diode D3 path in flow
Electric current.Control circuit 54 makes the gate turn-on of IGBT52 during the energization of diode D3.In mode M23, work as heater wire
When the depleted of energy of circle 35, heating coil current is positive from negative switching.
During mode M24 is the energization of IGBT52.At this point, IGBT52 gate turn-on, so electric current starts to flow.By
This, voltage resonance inverter 50 realizes the zero voltage switch for not generating switching losses.Electric current is in filter condenser C0, heater wire
Circle 35, the path of IGBT52 and power frequency supply 31, rectification circuit 32, inductor L0, heating coil 35, IGBT52, rectification circuit
It is flowed in 32 path.
By mode M21~mode M24 movement more than being repeated, the exchange of high frequency is flowed in heating coil 35
Electric current, heating kettle.
Figure 21 indicates the inverter driving dynamic frequency of the fifth embodiment of the present invention and the relationship of input power.In Figure 21 expression
The characteristic of the series resonance mode of the movement for the circuit mode stated.In general, making Driven by inverter frequency in the case where regulation power
Rate variation acts on resonance curve to carry out power control.The thickness that multiple magnetic layers are provided in the present embodiment is different
Layer, according to heating power, so resonance curve changes with heating power.In Figure 21, with the variation of resonance curve 1 when low-power, in
With the variation of resonance curve 2 when power, with the variation of resonance curve 3 when high-power.The magnetic metallic layers such as iron are provided in pot 1 inside
In the case of, independently from the size with power, acted on such as 1 such line of resonance curve.Therefore, power control is being carried out
In the case where, operating frequency range becomes larger.In addition, the maximum value of resonance curve is low, so being difficult to high-power.On the other hand,
In the present embodiment, resonance curve changes with heating power, so acting on the operation curve shown in Figure 21, can make inversion
Device driving frequency range narrows, and maximum value also becomes larger, and can be realized the firepower bigger than the prior art.
According to the present embodiment, due to being provided with the different magnetic layer of multiple thickness, so resonance curve can be made to change,
It can be realized high flame.
In addition, also including various modifications example the present invention is not limited to the above embodiments.For example, the above embodiments
It is to be not limited to include the entire infrastructure illustrated for ease of understanding the example for illustrating the present invention and being described in detail.
Description of symbols
Pot in 1
2,35 heating coil
3 ferrites
4 barricades
5 inverter circuit boards
10 electromagnetic induction electric cookers
11 aluminium layers
12,24,25,27 magnetic layer
13 non-magnetic metal layers
30,40 electromagnetic induction inverter circuit
31 power frequency supplies
32 rectification circuits
33 filter circuits
34 current resonance inverters
36,51 resonance circuit
37 current detectors
38,39,53 resonant capacitor
41、42、52 IGBT
43,44 buffer condenser
45,54 control circuit
Circuit occurs for 46 driving signals
47-1,47-2,55 driving circuits
48 control units
50 voltage resonance inverters
56 comparison circuits.
Claims (12)
1. a kind of electromagnetic induction electric cooker characterized by comprising
The interior pot being removably accommodated in main body；
Configure the heating coil in the lower section of the interior pot；With
To the heating coil power supply inverter circuit board,
It is formed with non-magnetic metal layer in the bottom of the interior pot,
The different multiple magnetic layers of thickness are formed between the interior pot and the non-magnetic metal layer.
2. electromagnetic induction electric cooker as described in claim 1, it is characterised in that:
The bottom of the interior pot is formed as round, and respectively thickness in the radial direction is different for the multiple magnetic layer.
3. lift appliance as claimed in claim 2, it is characterised in that:
Magnetic substance thickness of the magnetic layer positioned at radial outside than being located at radially inner side in the multiple magnetic layer.
4. electromagnetic induction electric cooker as described in claim 1, it is characterised in that:
The multiple magnetic layer is arranged with the first magnetic layer, the second magnetic layer, third magnetic layer from radial outside,
When set first magnetic layer with a thickness of t3, second magnetic layer with a thickness of t2, the third magnetic substance
Layer with a thickness of t1 when, the relationship of thickness meets t3 > t1 > t2.
5. electromagnetic induction electric cooker as described in claim 1, it is characterised in that:
The bottom of the interior pot is formed as round, and the thickness of the multiple magnetic layer in the circumferential is different.
6. a kind of electromagnetic induction electric cooker characterized by comprising
The interior pot being removably accommodated in main body；
Configure the heating coil in the lower section of the interior pot；With
To the heating coil power supply inverter circuit board,
It is formed with non-magnetic metal layer in the bottom of the interior pot,
The magnetic layer that be formed with radially thickness between the interior pot and the non-magnetic metal layer different.
7. such as electromagnetic induction electric cooker according to any one of claims 1 to 5, it is characterised in that:
The multiple magnetic layer is ferrite.
8. such as electromagnetic induction electric cooker according to any one of claims 1 to 6, it is characterised in that:
The non-magnetic metal layer is the AlSi that silicon is added in aluminium.
9. electromagnetic induction electric cooker as claimed in claim 6, it is characterised in that:
The magnetic layer is ferrite.
10. such as electromagnetic induction electric cooker according to any one of claims 1 to 6, it is characterised in that:
With exchange is converted to the rectification circuit of direct current and what is connect be converted to direct current the electricity of exchange with the rectification circuit
Resonance inverter portion is flowed,
The current resonance inverter includes:
The resonance circuit being made of the heating coil and resonant capacitor；With
It is upper with being made of the first thyristor and the second thyristor for resonance circuit series connection
Lower arm,
Based on the h eating power provided the heating coil, make the variation of resonant frequency of the resonance circuit.
11. such as electromagnetic induction electric cooker according to any one of claims 1 to 6, it is characterised in that:
With exchange is converted to the rectification circuit of direct current and what is connect be converted to direct current the electricity of exchange with the rectification circuit
Resonance inverter portion is pressed,
The voltage resonance inverter includes:
The resonance circuit being made of the heating coil and resonant capacitor；With
The first thyristor being connected in series with the resonance circuit,
Based on the h eating power provided the heating coil, make the variation of resonant frequency of the resonance circuit.
12. a kind of electromagnetic induction electric cooker characterized by comprising
The interior pot being removably accommodated in main body；
Configure the heating coil in the lower section of the interior pot；With
The inverter circuit board of high-frequency current is provided to the heating coil,
There is the non-magnetic metal layer of magnetic layer with the outside for being formed in the magnetic layer in the bottom of the interior pot,
The magnetic layer is ferrite.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017129091A JP6925890B2 (en) | 2017-06-30 | 2017-06-30 | Electromagnetic induction rice cooker |
| JP2017-129091 | 2017-06-30 |
Publications (2)
| Publication Number | Publication Date |
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| CN109219178A true CN109219178A (en) | 2019-01-15 |
| CN109219178B CN109219178B (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711381528.8A Active CN109219178B (en) | 2017-06-30 | 2017-12-20 | Electromagnetic induction electric cooker |
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| Country | Link |
|---|---|
| JP (1) | JP6925890B2 (en) |
| CN (1) | CN109219178B (en) |
| TW (1) | TW201906496A (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201906496A (en) | 2019-02-01 |
| JP2019010367A (en) | 2019-01-24 |
| CN109219178B (en) | 2021-09-07 |
| JP6925890B2 (en) | 2021-08-25 |
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