CN101627661B - Induction cooking device - Google Patents
Induction cooking device Download PDFInfo
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- CN101627661B CN101627661B CN2008800068100A CN200880006810A CN101627661B CN 101627661 B CN101627661 B CN 101627661B CN 2008800068100 A CN2008800068100 A CN 2008800068100A CN 200880006810 A CN200880006810 A CN 200880006810A CN 101627661 B CN101627661 B CN 101627661B
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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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- 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
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/07—Heating plates with temperature control means
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- Induction Heating Cooking Devices (AREA)
Abstract
An induction cooking device has an infrared sensor (26) provided below a top plate (2) and detecting the amount of infrared rays radiated from a heated object (20). When the temperature of the heated object (20) is lower than a lower limit temperature for detection, the infrared sensor (26) outputs a detection signal whose magnitude is substantially constant relative to the temperature of the heated object (20), and when the temperature of the heated object (20) is higher than or equal to the lower limit temperature for detection, the infrared sensor (26) outputs a detection signal so that the higher the temperature of the heated object (20), the greater the magnitude of and higher the increasing rate of the detection signal. A control section (29) has a storage section (29a) for storing, as an initial detection value, the value of output of the infrared sensor (26) immediately after the start of heating. When the amount of an increase in the value of output from the infrared sensor (26) relative to the initial detection value is higher than or equal to a predetermined value, the control section (29) reduces output of the induction heating coil or stops heating.
Description
Technical field
The present invention relates to use electromagnetic induction heating coil, the heating object of pot or pan etc. is carried out the induction cooking device of induction heating.
Background technology
In recent years, the induction cooking device that heating objects such as pot is carried out induction heating through heater coil etc. is because its safety, cleaning, high efficiency advantage and by people's understanding, and extensively popularized.This induction cooking device has following motion: in order to detect the temperature of heating object, and have the infrared ray sensor of detection from the infrared energy of heating object radiation.Infrared ray sensor is arranged on the below of top board, accept from form at top board can see through the incident of ultrared infrared ray incident area, from the infrared ray of heating object radiation, output is corresponding to the signal of the variations in temperature of heating object.The heating cooking device of record uses infrared ray sensor to detect the temperature of heating object in patent documentation 1 and the patent documentation 2, carries out the thermal control that adds of heater coil based on this detected temperatures.
Patent documentation 1: japanese kokai publication hei 11-225881 communique
Patent documentation 2: TOHKEMY 2007-115420 communique
Summary of the invention
Figure 11 is the figure of relation of emittance of temperature and the generation of expression heating object.Solid line 47 is that heating object is the situation of black matrix (reflectivity=1), and dotted line 48 is the situation of magnetic stainless steel (reflectivity=0.4) for heating object.Among this figure, the emittance the when emittance the when temperature of black matrix is 300 ℃ is 447 ℃ with the stainless temperature of magnetic is approximately identical.Thus, according to the difference of the reflectivity of heating object, the absolute value of the energy that infrared ray sensor receives changes greatly.Therefore, when the absolute value of the energy that receives based on infrared ray sensor is obtained the absolute temperature of heating object, can produce bigger error.
The heating cooking device of record in patent documentation 1, according to the temperature of the reflectivity conversion heating object of the light income of infrared ray sensor and heating object, based on conversion and the absolute temperature information temperature of carrying out heating object control.Such method makes for the mensuration of carrying out reflectivity and in addition, owing to the spot of infrared ray incident area or heating object, might correctly carry out the mensuration of reflectivity by complex structure.
The motion of the heating cooking device that comprises the infrared detection unit is arranged in patent documentation 2; This infrared detection unit uses the infrared-ray detecting element of 2 silicon photoelectric diodes formations that have peak sensitivity below the 1 μ m and in the different wavelengths zone; Output ratio to separately infrared-ray detecting element performs calculations, and does not receive the different influence of radiance of heating object and measures the temperature of heating object.But infrared-ray detecting element is necessary for 2, makes complex structure, and has the problem of the influence of the light that is interfered easily.
The present invention is for solving the product of above-mentioned problem; Its purpose is to provide a kind of induction cooking device; Be difficult to the to be interfered influence of spot of light, top board or heating object of this induction cooking device has simple structure, can carry out the temperature control of heating object through infrared ray sensor.
Induction cooking device of the present invention comprises:
Top board;
To carrying the heater coil that the heating object that places top board carries out induction heating;
The inverter circuit of high-frequency current is provided to heater coil;
Have be arranged on top board below, be used to detect infrared-ray detecting element from the infrared ray amount of heating object radiation; With the enlarging section of amplifying the detected signal of infrared-ray detecting element, and the infrared ray sensor of the detection signal of the corresponding size of the temperature of output and heating object; With
Based on the output of infrared ray sensor, the control part that the output of inverter circuit is controlled,
Thereby infrared ray sensor carry out in the output of controlling above-mentioned load coil through above-mentioned control part heating object temperature controlled control temperature range near; The temperature of above-mentioned heating object is high more; Output size and the big more above-mentioned detection signal of increment rate
Control part is setting when above in the output valve of above-mentioned infrared ray sensor with respect to the recruitment as the initial examination and measurement value of the output valve of the above-mentioned infrared ray sensor after just having begun to heat, and reduces the output of above-mentioned load coil, or stops heating.
When the temperature T of heating object rises, the detection signal X that the infrared ray sensor output voltage gradient increases.Temperature T S when therefore, the temperature T of the heating object when the recruitment Δ X that obtains stipulating begins with the heating of heating object is relevant.But; The output of infrared ray sensor has the increase characteristic of power function with respect to the temperature of heating object, and the temperature T of heating object is high more; The steeper slopes of the variation of the temperature T of the heating object of detection signal diminishes corresponding to the variations in temperature Δ T of heating object of the recruitment Δ X of regulation.Therefore, the temperature T of heating object is more high temperature, and the recruitment Δ X that will under few more variations in temperature Δ T, obtain stipulating therefore can detected temperatures changes and response suppresses output well or stops heating, and suppresses the rising of temperature.In addition, under stray light did as usual the situation of incident infrared transducer, the detection signal X of infrared ray sensor is parallel to be moved, and therefore the temperature of the temperature T of above-mentioned heating object suppresses control action and can affectedly hardly carry out.In addition, obtain the situation of absolute value with the temperature that output with infrared ray sensor is scaled heating object and compare, can greatly reduce the influence of the difference of radiance.
Infrared ray sensor is under the situation of temperature less than the detection lower limit temperature of heating object; The detection signal that is about definite value with respect to the temperature output size of heating object; Temperature at heating object is detecting under the situation more than the lower limit temperature; The temperature of heating object is high more, output size and the big more above-mentioned detection signal of increment rate.
The initial examination and measurement value also can be and the output valve that heats the infrared ray sensor that begins the while or promptly will begin to heat the time to be substituted in the output valve of the infrared ray sensor after just beginning to heat.
Temperature T S when the heating of heating object begins is not enough to be detected under the situation of lower limit temperature T0, and the size of the detection signal of infrared ray sensor output is about definite value.The temperature T S incoherent value of the temperature T of the heating object when therefore, obtaining recruitment Δ X with respect to the regulation of the initial output valve X0 that adds the infrared ray sensor output of pining for for the time with the heating beginning.Temperature T S when the heating of heating object begins is for detecting under the above situation of lower limit temperature T0; The output of infrared ray sensor is with respect to the temperature of heating object; Increase characteristic with power function; When the temperature T of heating object rises, the detection signal X that the infrared ray sensor output voltage gradient increases with power function.In this case, obtain above-mentioned action effect.If will detect lower limit temperature T0 be set in through the output of control part control load coil carry out heating object temperature controlled control temperature range near; The temperature of the Influence of Temperature control heating object of the heating object in the time of just can not heated beginning, the temperature range of the heating object during the heating beginning broadens.In addition, stray light does as usual under the situation of incident infrared transducer, and with above-mentioned same, the output X of infrared ray sensor is parallel to be moved, and therefore the inhibition control action of the temperature T of above-mentioned heating object can almost carry out insusceptibly.
Control part has the storage part that the output valve of the infrared ray sensor after just beginning to heat is stored as the initial examination and measurement value; Under the output valve of the heating beginning back infrared ray sensor situation littler, the initial examination and measurement value is changed to the output valve of less infrared ray sensor than initial examination and measurement value.
Control part also can have with heating beginning simultaneously, or the storage part stored as the initial examination and measurement value of the output valve of infrared ray sensor when being about to begin to heat.
Under the situation that the output valve of infrared ray sensor diminishes after heating begins, do not have the stray light of incident infrared transducer when supposing the heating beginning, suppose and put into water, culinary art thing etc.Under this state, continue heating, continue heating when the recruitment Δ X that obtains stipulating, suppress or the temperature of the heating object that stops to export higher than the temperature of setting.Therefore, under the situation that the initial output valve after beginning to heat reduces initial output valve changed to and reduce later value, can prevent that heating object is by superheated.Thus, suppress the control influence of light that is difficult to be interfered, can realize safe big firepower culinary art based on the temperature of the heating object of infrared ray sensor.
Control part also can be set between 200 ℃ to 290 ℃ detecting lower limit temperature, and the oil that suppresses to take in the heating object catches fire.
Thus, the mode that is higher than the necessary temperature (about 200 ℃) of the culinary art of fried food with the control temperature is set the detection lower limit temperature, can when the culinary art of fried food, not increase output, continues stably to carry out the culinary art of fried food.In addition, than the ignition point (330 ℃) of oil low more than 290 ℃, the output of infrared ray sensor must be risen, even therefore under minor amount of oil is accommodated in the situation of heating object, also can prevent to catch fire, can realize easy to use and raising fail safe.
Infrared-ray detecting element can utilize the photodiode of silicon to form.
Thus, can use simple structure and cheap infrared-ray detecting element, therefore can be with simplifying the structure and reducing cost.
According to induction cooking device of the present invention, purpose be to provide a kind of can be through carry out the temperature controlled induction cooking device of heating object with simple structure, the good infrared ray sensor of precision.
Description of drawings
Fig. 1 is the stereogram of the induction cooking device of embodiment of the present invention.
Fig. 2 is the structure chart of the induction cooking device of embodiment of the present invention.
Fig. 3 is the sectional view that amplify the part of the induction cooking device of embodiment of the present invention.
Fig. 4 is the sensory characteristic figure of infrared-ray detecting element of the induction cooking device of embodiment of the present invention.
Under the detected infrared radiation energy of infrared-ray detecting element of Fig. 5 for the induction cooking device of expression embodiment of the present invention, heating object is the figure of the situation of black matrix.
Fig. 6 is the figure of the transmitance of the filter of configuration on every side of the infrared ray sensor of the induction cooking device of expression embodiment of the present invention.
Fig. 7 is the output characteristics figure with respect to the infrared ray sensor of the temperature of heating object of the induction cooking device of embodiment of the present invention.
Fig. 8 exports the flow chart of control and treatment based on the output of infrared ray sensor for the control part of the induction cooking device of expression embodiment of the present invention.
Fig. 9 is the output characteristics figure with respect to the infrared ray sensor that heats the elapsed time after beginning of the induction cooking device of embodiment of the present invention.
Figure 10 is the output characteristics figure of infrared ray sensor of temperature of the heating object different with respect to reflectivity of the induction cooking device of embodiment of the present invention.
Figure 11 is the performance plot with respect to the infrared ray sensor of the temperature of heating object of existing induction cooking device.
Symbol description
1 peripheral housing
2 top boards
3 left induction heaters (burner)
4 right induction heaters
5 left induction heater display parts
6 right induction heater display parts
7 left induction heater console switchs (operating portion)
8 right induction heater console switchs (operating portion)
9 mains switches
20 heating objects
The 21a interior loop
The 21b exterior loop
22 heater coil brace tables
23 ferrites
24 infrared ray incident areas
25 light conducting cylinders
26 infrared ray sensors
26a photodiode (infrared-ray detecting element)
The 26b amplifier
27 show LED
The 27a light-emitting zone
The 27b light conductor
28 inverter circuits (inverter circuit)
29 control parts
The 29a storage part
30 temperature sensors
31 filters
The 31a light collecting lens
Embodiment
Below, to execution mode of the present invention, describe with reference to accompanying drawing.
Execution mode
[structure of induction cooking device]
Fig. 1 is the stereogram of the induction cooking device of embodiment of the present invention.The induction cooking device of this execution mode has peripheral housing 1 and is arranged on the top of peripheral housing 1 and is covered its top board 2 on every side by top frame 2a.About the upper surface of top board 2, be provided with the left induction heater 3 and right induction heater 4 that use heater coil to heat, be printed in the upper surface of top board 2 and show corresponding to the heated perimeter of each heater coil.The quilt of heating objects such as pot carries part on the display part of the heated perimeter that places the left induction heater of expression 3, right induction heater 4 by induction heating.
The front side of left side induction heater 3 and right induction heater 4 is provided with the left induction heater display part 5, the right induction heater display part 6 that add thermal output etc. that shows left induction heater 3, right induction heater 4 respectively., be provided with at left and right directions one row and be used for the user and carry out left induction heater 3, the right induction heater 4 left induction heater console switch (operating portion) 7 that adds thermal control, right induction heater console switch (operating portion) 8 separately near the front side more.The front of casing body 1 is provided with mains switch 9 on the right outside.
Fig. 2 is the structure chart of the induction cooking device of embodiment of the present invention.Induction heater among Fig. 1 has 2, and explanation has only shown 1 for ease in Fig. 2.Below top board 2, the demonstration 3a of the round shape of the heated perimeter of expression induction heater 3,4, the position that 4a is corresponding are provided with and produce the heater coil that AC magnetic field comes heating object 20 is carried out induction heating.In this execution mode, heater coil has the structure that separately is wound as interior loop 21a and exterior loop 21b.Below, interior loop 21a and exterior loop 21b are referred to as heater coil 21.In addition, heater coil 21 is not to be necessary for the structure of separately reeling.Heater coil placed on the heater coil brace table 22 that the below of top board 2 is provided with in 21 years.Be provided with near the ferrite 23 as magnet of flux concentrating heater coil 21 at the lower surface of heater coil brace table 22 towards the rear side of heater coil 21.
In top board 2, the part 24 relative with the space segment between interior loop 21a and the exterior loop 21b is the infrared ray incident area, forming through ultrared mode.Top board 2 integral body form by seeing through ultrared heat-stable ceramic, and the print film 2b that the lower surface beyond the infrared ray incident area 24 is difficult to see through the little for example black of infrared ray and reflectivity covers (with reference to Fig. 3).In addition, the structure of infrared ray incident area 24 is not limited thereto.Also can be by seeing through infrared ray incident area 24 part in addition that ultrared material constitutes top board 2, by seeing through the part that ultrared material constitute infrared ray incident area 24.In addition, also can by the non-vanishing print film of infrared ray transmitance constitute infrared ray incident area 24 around.Between interior loop 21a below the infrared ray incident area 24 and exterior loop 21b, vertically be provided with heater coil brace table 22 at the light conducting cylinder 25 that above-below direction has a tubular of opening with the upper and lower surfaces of heater coil 21 one-body moldedly.It is relative with the lower opening of light conducting cylinder 25 that infrared ray sensor 26 is arranged to.From the infrared ray of the bottom surface radiation of heating object 20 along with the temperature rising radiant energy quantitative change of heating object 20 is big.This infrared ray, is accepted by infrared ray sensor 26 through the inside of light conducting cylinder 25 from being arranged at infrared ray incident area 24 incidents on the top board 2.When light conducting cylinder 25 makes infrared ray sensor 26 away from top board 2; Have the effect that ultrared field range that infrared ray sensor 26 accepts can narrow down, therefore can the infrared ray of relative with the light in part of light conducting cylinder 25 part from cooking container effectively and optionally be incided infrared ray sensor.Infrared ray sensor 26 is based on the ultrared infrared energy output detection signal of accepting.
In addition, not under the situation of the structure of separately reeling at heater coil 21, infrared ray incident area 24 can be arranged in the opening of central part of heater coil 21.If in this case as much as possible with the spiral of infrared ray incident area 24, then can detect the temperature of the more high-temperature portion of heating object 20 through infrared ray sensor 26 near heater coil 21.
Show that LED27 is arranged near the infrared ray sensor 26, be installed on the heater coil brace table 22 with infrared ray sensor 26.That is, show LED27 below top board 2, be arranged on heater coil 21 and infrared ray sensor 26 near.Show that LED27 is configured to: the user can confirm its luminance through near top board 2 range estimation infrared ray incident area 24 from the top of utensil.For example, the back side of only passing through light conductor 27b importing top board 2 of sending of the demonstration LED27 of heater coil 21 belows setting is neighbouring and luminous.Therefore showing that LED27 has makes the user discern the effect of the location of infrared ray incident area 24.See from utensil; As shown in Figure 1; Can estimate near light-emitting zone 27a formation infrared ray incident area 24 of the light that confirm to show LED27, with respect to infrared ray incident area 24, be arranged at the outer circumferential side of heater coil 21 and than the center of heater coil 21 more near the front side.Through like this setting of position relation with infrared ray incident area 24 and light-emitting zone 27a, hide light-emitting zone 27a and can cover through bottom surface with heating object 20, make covering hide infrared ray incident area 24 possibilities and improve.The possibility that covers hiding infrared ray incident area 24 for feasible bottom surface with heating object 20 is higher; Infrared ray incident area 24 and light-emitting zone 27a are configured in through on about center of heater coil 21 and the straight line vertical with the body front or near it, and preferred light-emitting zone 27a is disposed at than infrared ray incident area 24 and more leans on the front side.
Below heater coil 21 or around it, be provided with to the inverter circuit 28 of heater coil 21 supply high frequency electric currents and the control part 29 that the action of inverter circuit 28 is controlled.Operating portion 7 is arranged at the front surface or the upper surface of utensil, has heating pass/key point 7a, reduction key (downkey) 7b that reduces output that is used to begin or stop heating action, increase key (upkey) 7c that increases output.Control part 29 has storage part 29a; Based on the output signal of operating portion 7 or the output signal of infrared ray sensor 26; Control to the supply of the high-frequency current of heater coil 21 begin stop and the size of the high-frequency current supplied with to heater coil 21, further implement other the whole control of induction cooking device.Mains switch 9 is arranged at the front surface or the upper surface of utensil.
Moreover the induction cooking device of this execution mode has the temperature sensor 30 that is arranged on the atmosphere temperature that shows near LED27 periphery, that detect demonstration LED27.Temperature sensor 30 is a temperature detecting part, is made up of the detector unit of thermistor etc.Control part 29 judges whether the detected temperature of temperature sensor 30 is more than the set point of temperature; Under situation about being judged as more than the set point of temperature; For the reduction in life-span of suppressing to show LED27, compare with the situation of not enough set point of temperature and can make the output that shows LED27 reduce or make its driving stop.
[action of induction cooking device]
Below, the elemental motion of induction cooking device is described.When the user closed mains switch 9, control part 29 became standby mode.At standby mode, if heat initiation command from the heating pass/key point 7a input of operating portion 7, then control part 29 becomes heating mode.At heating mode, if operation (for example pressing) heating pass/key point 7a input heating is ceased and desisted order, then control part 29 becomes standby mode, and heating stops.In addition; At heating mode, if operation (for example pressing) adds thermal output increasing-and-decreasing key 7b, 7c, the order of input firepower increase and decrease; Then control part 29 is based on the switch element of the order control inverter circuit 28 of this input, and control is to the quantity delivered of the high-frequency current of heater coil 21.If to heater coil 21 supply high frequency electric currents, then produce high frequency magnetic field from heater coil 21, place the heating object 20 on the top board 2 to carry out induction heating to carrying.
After mains switch 9 closes; Before the heating pass/key point 7a of operating operation portion 7; Promptly at holding state; Control part 29 is in order to make the user discern the position of infrared ray incident area 24 and in order to promote heating object 20 to cover infrared ray incident area 24 more accurately, and output drive signal makes to show that LED27 becomes luminance.In addition, the user can be through the indication of operation instructions etc., also can make heating object before the heating beginning, cover to hide and show LED27 through the points for attention of its main idea of showing on the top board 2 or the indication of sound and text notification or demonstration.The user put heating object in 20 years above demonstration LED27, covered to hide to show that after the LED27, operation is heated pass/key point 7a and begun heating.
As shown in Figure 3, infrared ray sensor 26 is included as photodiode 26a and the amplifier 26b of the output signal that amplifies photodiode 26a of the silicon of infrared-ray detecting element as inscape.Between the infrared-ray detecting element 26a of the lower opening of light conducting cylinder 25 and infrared ray sensor 26, be provided with the filter 31 of the influence that is used to remove visible light.Filter 31 forms side and the top that covers infrared-ray detecting element 26a.Above infrared-ray detecting element 26a, be provided with light collecting lens 31a with filter 31 one-body moldedly.Light collecting lens 31a has effectively infrared ray light harvesting with incident light conducting cylinder 25 in the effect in the visual field of infrared-ray detecting element 26a and definite infrared-ray detecting element 26a.As stated, light conducting cylinder 25 also has the effect that limits the visual field, therefore limits the visual field with any.
Fig. 6 is the figure of the transmitance of the filter 31 of the induction cooking device of expression embodiment of the present invention.Use is zero filter 31 to the transmitance of the light of about less than 0.9 mum wavelength.Fig. 4 is the spectral sensitivity performance plot of photodiode 26a of the induction cooking device of embodiment of the present invention.The photodiode 26a of this execution mode is set at that peak sensitivity is about 1 μ m (0.95 μ m) in the spectral sensitivity characteristic, can detect the light that is about 0.3～1.1 mum wavelength.The material of top board 2 is under the situation of heat-stable ceramic manufacturing, significantly reduce in 3 μ m front and back and the optical wavelength area light transmitance more than the 5 μ m, and radiance significantly increases.The peak value of the sensitivity of photodiode 26a is set at about 1 μ m; Be set in the wavelength region may below the 3 μ m; Therefore receive luminous sensitivity decline and be difficult to accept infrared ray from the wavelength region may of top board 2 most of radiation own; Thereby suppress its temperature effect, can accept effectively from the infrared ray that sees through top board 2 of the bottom surface radiation of heating object 20.Fig. 5 is the figure of relation of spectroradio briliancy and the wavelength of expression black matrix.Ultrared emittance (radiation briliancy) increases with the temperature rising of heating object 20.
The infrared ray sensor 26 of this execution mode constitutes: the infrared ray from the bottom surface radiation of heating object 20 that detect to see through the top board 2 of heat-stable ceramic system; And the silicon photoelectric diode that uses above-mentioned that kind is as infrared-ray detecting element 26a; The magnification ratio of adjustment amplifier 26b obtains detection signal shown in Figure 7 thus.In Fig. 7, transverse axis is the temperature of the bottom surface portions of the heating object 20 relative with infrared ray incident area 24, and the longitudinal axis is the output voltage of infrared ray sensor 26, i.e. the size of detection signal.Solid line 41 is the situation that do not have interference, and dotted line 42 is noisy situation.At first, the situation to the interference that do not have visible light etc. describes.In this execution mode; As shown in Figure 7; The detection signal of infrared ray sensor 26 the temperature of heating object 20 for not enough detect lower limit temperature T0 when (being about 235 ℃) its size be approximately zero (under the situation of this execution mode for below the 20mV); Temperature at heating object 20 reaches detection lower limit temperature T0 when (being about 235 ℃); Begin output, the slope that increases of the detection signal size of high IR line sensor 26 is big more more for the temperature of heating object, promptly increases the increase characteristic that display rate becomes big power function.In addition, the resolution of the microcomputer of the output voltage of mensuration control part 29 employed infrared ray sensors 26 is 20mV, and not enough this pH-value determination pH is zero.From absolute temperature is that the body surface radiation of T (K) contains ultrared electromagnetic wave, and it is the total radiation energy E (W/m of unit per hour
2) represent with E=ε σ T4 in theory.Here, ε is a radiance, and σ is Si Difen-Boltzmann constant.Therefore; Can detect selection has the peak sensitivity characteristic in the necessary wavelengths the ultrared element element as detecting element 26a from various; Like Fig. 2,3 structure, through amplifier 26b this detection voltage is amplified, obtain having the characteristic of desired characteristic as shown in Figure 7 thus.
Fig. 8 representes that the infrared ray sensor 26 of control part 29 carries out the temperature controlled flow chart of heating object 20.Turn on the power switch 9 (S1), when opening heating passs/key point 7a (S2), control part 29 is imported the output voltage of infrared ray sensors 26, (S3) detects as the output voltage X0 (initial examination and measurement value) after just beginning to heat.Output voltage X0 after just beginning of obtaining of detection heated is stored in storage part 29a (S4).Once more, the output voltage of input infrared ray sensor 26 detects as present output voltage X (S5).That calculates storage part 29a storage just begins output voltage X0 and poor (the recruitment Δ X) of present output voltage X after heating, and judges whether the recruitment Δ X that calculates is setting above (S6).
For example, in Fig. 7, X is set at 0.4V with setting for the recruitment Δ.If just having begun the temperature of heating back (for example, just having heated after the operation of pass/key point 7a) heating object 20 is T1 (for example being 30 ℃), the temperature of the heating object 20 when then recruitment Δ X is setting is T3 (for example being 290 ℃).In addition, if the temperature of the heating object 20 after just having begun to heat is T2 (for example being 260 ℃), the temperature of the heating object 20 when then recruitment Δ X is setting is T4 (for example being 298 ℃).Further, if the temperature of the heating object 20 after just having begun to heat is T4 (for example being 298 ℃), the temperature of the heating object 20 when then recruitment Δ X is setting is T5 (for example being 316 ℃).
Control part 29 judges that recruitment Δ X are setting when above (S6 is Yes), and the action or the reduction that stop inverter circuit 28 add the temperature rising (S7) that thermal output suppresses heating object 20.Even temperature be reduced in recruitment Δ X be setting above during; Proceed to add the inhibition action of thermal output or stop (S11 is Yes); When recruitment Δ X deficiency setting (S11 is No); Control (S12) is restored in the thermal output that adds that increases output once more or open the heating action etc. of the heater coil 21 that has stopped once more, gets back to S5.This add thermal output restore the recruitment Δ X of the regulation of using in the control can be identical with the value that is used to suppress to add thermal output, also can be lower than the value that is used to suppress to add thermal output, set and lag behind etc., adopt different values.The size that adds thermal output during recovery can suit to select.Particularly; Heating object 20 is high temperature more; Variation with respect to the recruitment Δ X of the variations in temperature of heating object 20 is rapid more, can be with the variations in temperature of the heating object 20 that more high-sensitivity detection is littler more, therefore; Even utilize the height of 3kW for example etc. to add thermal output heating heating object 20, also can response well with the temperature maintenance of heating object 20 at high temperature and can excessively not rise.For example, can detect the high temperature of oil before catching fire, in addition, can distinguish empty pot down heating and cook the state of cooked food, can be heated to cook with big firepower and fry suitable temperature, so can heat up fast.In addition, certainly do not get rid of and other temperature-controlled process combination yet.
When control part 29 is judged the not enough settings of recruitment Δ X (S6 is No), judge that present output voltage X is whether for more than the output voltage X0 of just beginning of storing of storage part 29a after heating.Present output voltage X for storage part 29a storage just begin get back to S6 under the above situation of output voltage X0 after heating (S8 is Yes).Under the situation of the output voltage X0 that the heating of storage part 29a storage that present output voltage X is not enough begins (S8 is No), the output voltage X0 that just begins after heating of storage part 29a storage is changed to present output voltage X (S9), return S6.
Pine for adding, output voltage increases usually.But just having begun to heat back infrared ray incident area 24 is not just in time covered by heating object 20; And adding when pining for that heating object 20 moved to correct position; The influence that is interfered; Compare when not being interfered, it is big that the output voltage X0 after just having begun to heat becomes, no matter therefore whether pine for the phenomenon that can cause that all output voltage reduces adding.(S8 is No) in this case, the output voltage X0 after just beginning of storing among the storage part 29a heated changes to be interfered and influences the little present output voltage X (S9) of possibility.Afterwards, export control and treatment based on the output voltage of new storage.
As stated, under the situation that just begins the not enough detection of heated temperatures TS lower limit temperature T0 of heating object 20, even the variations in temperature of heating object 20, the size of the detection signal of infrared ray sensor 26 (output voltage) is zero, is about definite value.But through heating, the temperature T of heating object 20 surpass to detect lower limit temperature T0, and with respect to the size of the detection signal after just beginning to heat, the recruitment Δ X of the size of present detection signal is a setting.At this moment, the inhibition temperature T of heating object 20 3 is with just to have begun heated temperatures TS uncorrelated, become with the detection signal of infrared ray sensor 26 from zero increase Δ X the corresponding inhibition temperature T of some 3=T0+ Δ T3.Control part 29 adds thermal output in action or the reduction that this inhibition temperature T 3 stops inverter circuit 28, and the temperature that suppresses heating object 20 rises.
In addition, heating object 20 just begin heated temperatures TS under situation about detecting more than the lower limit temperature T0, when the temperature T of heating object 20 rose, the detection signal of infrared ray sensor 26 became big and increment rate also slowly becomes big.The temperature of the heating object when recruitment Δ X is setting and heating object just to begin heated temperatures TS relevant.Therefore but the temperature T of heating object 20 is high more, and the increment rate of detection signal is big more, and the variations in temperature Δ T corresponding to the heating object of the recruitment Δ X of regulation diminishes.Under situation shown in Figure 7, Δ T3 (being about 55 ℃)＞Δ T4 (being about 38 ℃)＞Δ T5 (being about 18 ℃).But the temperature T of heating object 20 is got over high temperature, and therefore the recruitment Δ X that can under more little temperature rising Δ T, obtain stipulating can response suppress output or stop heating well, suppresses temperature and rises.
Then, the situation to the quiet interference that has visible light etc. describes.The temperature of stray light and heating object 20 is uncorrelated.Therefore, as shown in Figure 7, (dotted line 42) compared with the situation that does not have interference (solid line 41) under the situation about exist disturbing, level for roughly the direction of principal axis of the detection signal of infrared ray sensor 26 only the horizontal W of parallel mobile stray light become big.Under the situation that just begins the not enough detection of heated temperatures TS lower limit temperature T0 of heating object 20, the size of the detection signal of infrared ray sensor 26 is about definite value for W.The figure with respect to the variation of effluxion of the output voltage of the infrared ray sensor 26 of Fig. 9 after for expression heating beginning (t0).Solid line 43 expressions do not have the situation of interference, the noisy situation of dotted line 44 expressions.In either case, the time point (t1) that arrives the control temperature of regulation at heating object 20 adds thermal output and is suppressed or stops heating.Therefore, the influence that utilizes the structure of this execution mode can remove quiet stray light.
Rise through the infrared ray sensor 26 of aforesaid structure and the temperature of control part 29 control heating objects 20; Can reduce just to have begun poor, or the influence of the stray light of the daily visible light of input etc. of heated temperatures; Can the bottom surface temperature of heating object 20 be suppressed at below near the temperature 300 ℃, can suppress the mode that the temperature of heating object 20 rises well with precision and control.
Then, use Figure 10 that the influence of the reflectivity of heating object 20 for the detection signal of infrared ray sensor 26 is described.In Figure 10; Solid line 45 is that the expression heating object is the temperature of the heating object under the situation of black matrix (reflectivity=1) and the practical measurement result of the relation of the size of the detection signal of infrared ray sensor 26, and dotted line 46 is the characteristic under the situation that solid line 45 calculating heating objects are magnetic stainless steel (reflectivity=0.4) is multiply by in expression with reflectivity 0.4 results.According to this figure, the output valve of the infrared ray sensor 26 the when output valve of the infrared ray sensor 26 the when temperature of black matrix is 300 ℃ and the stainless temperature of magnetic are 322 ℃ is roughly the same, and its temperature difference is 22 ℃.As stated, in Figure 11, the emittance when the stainless temperature of emittance the when temperature of black matrix is 300 ℃ and magnetic is 447 ℃ is roughly the same, and its temperature difference is 147 ℃.Thus, compare, can suppress the influence of the difference of radiance significantly with existing control method.
The induction cooking device of this execution mode uses infrared ray sensor described as follows; Promptly; Under the not enough situation that detects lower limit temperature of the temperature of heating object relatively with the about certain detecting signal of temperature output size of heating object; Detecting under the situation more than the lower limit temperature in the temperature of heating object, along with the temperature of heating object uprises output size and the big detection signal of increment rate change; If the recruitment Δ X with respect to the output voltage X0 (initial examination and measurement value) after just beginning to heat is more than the setting, then reduces the output of load coil or stop heating.Thus, just the beginning under the not enough situation that detects lower limit temperature T0 of heated temperatures TS of heating object, the temperature T of heating object can reduce the output of load coil or stop heating with just to have begun heated temperatures TS irrelevant during for certain certain temperature.In addition, even detecting under the situation more than the lower limit temperature T0 at the heated temperatures TS that just begins of heating object, the ignition point that also can reach oil in the temperature T of heating object reduces the output of load coil before or stops heating for 330 ℃.Moreover, can receive the influence of daily stray light hardly.
The induction cooking device of this execution mode; Output voltage X0 (initial examination and measurement value) after control part 29 will just begin to heat is stored in storage part 29a; Under the situation that just begin output voltage X0 heat after of the present output voltage X in heating beginning back, the output voltage X0 that just begins after heating of storage is changed to present output voltage X less than storage.Thus; Infrared ray incident area 24 does not have 20 coverings of lucky heating object after just beginning to heat; Pine for heating object 20 is moved under the situation of appropriate position and add; When cooking the quilt of water or vegetables etc. in the thing input heating object 20 when heating object 20 is high temperature, also can prevent heating object, can realize safe big firepower culinary art by superheated.
Wherein, in this execution mode, the benchmark when the output voltage X0 (initial examination and measurement value) of the infrared ray sensor after just beginning to heat is measured as recruitment Δ X, but the present invention is not limited to this.Also can substitute just begun heating after, suitable select maybe will begin heating simultaneously with the heating beginning before, can access same effect.In addition, before just beginning the heating back or will beginning heating, can on the degree of the main idea that does not change foregoing invention, change constantly it.For example, also can heating passs/key point 7a heat begin operation and detect after, the delay official hour.Time of delay is preferably in 10 seconds, more preferably in 3 seconds.
In this execution mode; As infrared-ray detecting element 26a; Use silicon photoelectric diode; Realize near the temperature inhibit feature of the cheap heating object of cooking the cooked food culinary art of suitable temperature being 330 ℃ as the control temperature, but also can select silicon pin-photo diode, germanium, indium, gallium, arsenic etc., obtained the different infrared-ray detecting element of wavelength of other peak sensitivity; With this execution mode Different control temperature (suppress for the temperature of controlling heating object 20 or increase the temperature that adds thermal output), obtain same output characteristic (high more output valve of temperature and the big more characteristic of increment rate) and carry out the same thermal output control that adds.
In addition; In the execution mode; The recruitment Δ X with respect to the output valve after just beginning to heat of the detection signal of infrared ray sensor 26 is that setting is when above; Suppress to add thermal output or stop heating action; But the annunciator of the display unit that also can be through vision or the sense of hearing of sound, report sound etc. be big to more than the regulation according to the value of recruitment Δ X, shows or reports that the temperature of heating object is the low-temperature condition or the condition of high temperature that reaches set point of temperature (for example showing the preheat mode of pan etc.).
The possibility of utilizing in the industry
Induction cooking device of the present invention can be with the infrared ray of simple structure detection from the heating object radiation; Temperature with good accuracy detection heating object; Can near the temperature of the heating object that the hope inhibition is exported, the response better controlling export; So having the effect that can utilize induction cooking device to improve the controlled lifting culinary art performance of heating object, the induction cooking device that uses during average family and business are used is useful.
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| JP2007210759 | 2007-08-13 | ||
| PCT/JP2008/000527 WO2008120448A1 (en) | 2007-03-12 | 2008-03-11 | Induction cooking device |
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