CN101627661A - Induction cooking device - Google Patents
Induction cooking device Download PDFInfo
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- CN101627661A CN101627661A CN200880006810A CN200880006810A CN101627661A CN 101627661 A CN101627661 A CN 101627661A CN 200880006810 A CN200880006810 A CN 200880006810A CN 200880006810 A CN200880006810 A CN 200880006810A CN 101627661 A CN101627661 A CN 101627661A
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- temperature
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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, by heater coil etc. the induction cooking device that heating objects such as pot carry out induction heating is familiar with by people because of its safety, cleaning, high efficiency advantage, and is 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 the emittance of expression temperature of heating object and generation.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 is subjected to changes greatly.Therefore, when the absolute value of the energy that is subjected to 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 absolute temperature information carry out the temperature control of heating object.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 that 1 μ m is following and have 2 silicon photoelectric diodes formations of peak sensitivity in different wavelength region may, output ratio to separately infrared-ray detecting element performs calculations, and is not subjected to 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 by infrared ray sensor.
Induction cooking device of the present invention comprises:
Top board;
Mounting is carried out the heater coil of induction heating in the heating object of top board;
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 by 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 obtain stipulating under few more variations in temperature Δ T 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, under the temperature of heating object is detecting 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 by the output of control part control load coil carry out heating object temperature controlled control temperature range near, the temperature of the Temperature Influence 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 the 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 than the temperature height 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 temperature (about 200 ℃) of culinary art necessity of fried food with the control temperature is set the detection lower limit temperature, can not increase output when the culinary art of fried food, 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 also can prevent to catch fire under a small amount of oil is accommodated in the situation of heating object, 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 will simplify the structure and reduce cost.
According to induction cooking device of the present invention, purpose be to provide a kind of can be by 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, at embodiments 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 present embodiment 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 the 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.Heating objects such as pot by the part sensed heating of mounting on the display part of the heated perimeter of expression left induction heater 3, right induction heater 4.
The front side of a 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.In more close front side, 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.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, has only shown 1 for convenience of description 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 of 4a correspondence are provided with and produce the heater coil that AC magnetic field comes heating object 20 is carried out induction heating.In the present embodiment, 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 21 mountings are on the heater coil brace table 22 of the below of top board 2 setting.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 space segment between interior loop 21a and the exterior loop 21b is the infrared ray incident area, forming by 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 surface 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 by 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 the infrared ray of relative with the light in part of light conducting cylinder 25 part from cooking container effectively and optionally can 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 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 in this case by 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 by 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.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,, be arranged at the outer circumferential side of heater coil 21 and than more close front, the center of heater coil 21 side with respect to infrared ray incident area 24.By so setting of position relation, and can pass through to hide light-emitting zone 27a, make to cover hiding infrared ray incident area 24 possibilities raising with the bottom surface covering of heating object 20 with infrared ray incident area 24 and light-emitting zone 27a.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 by 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 more by 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 to heat 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 the control of other induction cooking device integral body.Mains switch 9 is arranged at the front surface or the upper surface of utensil.
Moreover the induction cooking device of present embodiment 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 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, the heating object 20 of mounting on top board 2 carried out induction heating.
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 by the indication of operation instructions etc., also can make heating object before the heating beginning, cover to hide and show LED27 by 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 is positioned in the top that shows LED27 with heating object 20, covers to hide to show after the LED27, and operation heating pass/key point 7a begins heating.
As shown in Figure 3, infrared ray sensor 26 be included as inscape infrared-ray detecting element silicon photodiode 26a and amplify the amplifier 26b of the output signal of photodiode 26a.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 mentioned above, 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 present embodiment 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 following wavelength region may of 3 μ m, descended by luminous sensitivity and be difficult to accept from the infrared ray of the wavelength region may of the most of radiation of top board 2 itself, 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 the relation of expression spectroradio briliancy of black matrix and wavelength.Ultrared emittance (radiation briliancy) increases with the temperature rising of heating object 20.
The infrared ray sensor 26 of present embodiment 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 use silicon photoelectric diode as described above as infrared-ray detecting element 26a, adjust the magnification ratio of amplifier 26b, obtain 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 situations that do not have interference, and dotted line 42 is noisy situations.At first, the situation to the interference that do not have visible light etc. describes.In the present embodiment, 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 present embodiment 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, select to have the element of the peak sensitivity characteristic in the necessary wavelengths the ultrared element from various can the detection as detecting element 26a, as Fig. 2,3 structure, by amplifier 26b this detection voltage is amplified, obtain having the characteristic of desired characteristic as shown in Figure 7 thus.
Fig. 8 represents 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 after heating and poor (the recruitment Δ X) of present output voltage X, 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 output voltage X0 after just having begun to heat becomes, no matter therefore whether adding the phenomenon of pining for all can causing the output voltage reduction.(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 mentioned above, 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 by 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 the zero corresponding inhibition temperature T of the some 3=T0+ Δ T3 that increases Δ X.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 obtain stipulating under more little temperature rising Δ T 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 present embodiment can remove quiet stray light.
Rise by the infrared ray sensor 26 of aforesaid structure and the temperature of control part 29 control heating objects 20, the influence of the stray light of the daily visible light that can reduce just to have begun the poor of heated temperatures or import etc., the bottom surface temperature of heating object 20 can 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 mentioned above, 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 present embodiment 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, under the temperature of heating object is detecting situation more than the lower limit temperature, along with the temperature of heating object uprises, output size and increment rate become big detection signal, 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, reduce the output of load coil or stop heating before also can reaching 330 ℃ at the ignition point of oil in the temperature T of heating object at the heated temperatures TS that just begins of heating object.Moreover, can be subjected to the influence of daily stray light hardly.
The induction cooking device of present embodiment, 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 lucky heating object 20 to cover 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 by superheated, can realize safe big firepower culinary art.
Wherein, in the present embodiment, 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 the present embodiment, as infrared-ray detecting element 26a, use silicon photoelectric diode, realized 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 the silicon pin-photo diode, germanium, indium, gallium, arsenic etc., obtain the different infrared-ray detecting element of wavelength of other peak sensitivity, (suppress in the control temperature different for the temperature of controlling heating object 20 with present embodiment, or add the temperature of 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 the heating action, but the annunciator of the display unit that also can be by vision or the sense of hearing of sound, report sound etc., value according to recruitment Δ X is big more than regulation, and the temperature of demonstration or report 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 industrial utilization
Induction cooking device of the present invention can be with simple structure detection from the heating object radiation Infrared ray, with the temperature of good accuracy detection heating object, can suppress output in hope The temperature of heating object near the good control output of response, therefore have and can utilize sense The effect of performance is cooked in the controlled lifting of answering heating cooking device to improve heating object, to common family The induction cooking device that uses in front yard and professional the using is useful.
Claims (7)
1. an induction cooking device is characterized in that, comprising:
Top board;
Heater coil, it carries out induction heating to the described heating object of mounting on described top board;
Inverter circuit, it is to described heater coil supply high frequency electric current;
Infrared ray sensor, its have be arranged on described top board below, detect from the infrared-ray detecting element of the infrared ray amount of described heating object radiation, with the enlarging section of amplifying the detected signal of described infrared-ray detecting element, and the detection signal of the corresponding size of the temperature of output and described heating object; With
Control part, it controls the output of described inverter circuit based on the output of described infrared ray sensor,
Thereby described infrared ray sensor carry out in the output of controlling described load coil by described control part described heating object temperature controlled control temperature range near, the temperature of described heating object is high more, output size and the big more described detection signal of increment rate
Described control part is setting when above in the output valve of described infrared ray sensor with respect to the recruitment as the initial examination and measurement value of the output valve of the described infrared ray sensor after just having begun to heat, and reduces the output of described load coil, or stops heating.
2. induction cooking device as claimed in claim 1 is characterized in that:
Described infrared ray sensor is under the situation of temperature less than described detection lower limit temperature of described heating object, the detection signal that is about definite value with respect to the temperature output size of described heating object, in the temperature of described heating object under the situation more than the described detection lower limit temperature, the temperature of described heating object is high more, output size and the big more described detection signal of increment rate.
3. induction cooking device as claimed in claim 1 or 2 is characterized in that:
Described initial examination and measurement value for the output valve of heating beginning described infrared ray sensor simultaneously or when being about to begin to heat, replace the output valve of the described infrared ray sensor after just having begun to heat.
4. induction cooking device as claimed in claim 1 or 2 is characterized in that:
Described control part has the storage part that the output valve of the described infrared ray sensor after just beginning to heat is stored as the initial examination and measurement value, the output valve of the described infrared ray sensor in heating beginning back than the little situation of described initial examination and measurement value under, described initial examination and measurement value is changed to the output valve of described less infrared ray sensor.
5. induction cooking device as claimed in claim 3 is characterized in that:
Described control part have with the output valve of heating beginning time or the described infrared ray sensor when being about to begin to heat storage part as the storage of initial examination and measurement value, under the situation of output valve less than described initial examination and measurement value of the described infrared ray sensor in heating beginning back, described initial examination and measurement value is changed to the output valve of described less infrared ray sensor.
6. as each described induction cooking device in the claim 2～5, it is characterized in that:
Described control part is set in described detection lower limit temperature between 200 ℃ to 290 ℃, makes the oil that suppresses to take in the cooking container catch fire.
7. as claim 1 or 6 described induction cooking devices, it is characterized in that:
Described infrared-ray detecting element utilizes the photodiode of silicon to form.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP061778/2007 | 2007-03-12 | ||
| JP2007061778 | 2007-03-12 | ||
| JP2007210759 | 2007-08-13 | ||
| JP210759/2007 | 2007-08-13 | ||
| PCT/JP2008/000527 WO2008120448A1 (en) | 2007-03-12 | 2008-03-11 | Induction cooking device |
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| Publication Number | Publication Date |
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| CN101627661A true CN101627661A (en) | 2010-01-13 |
| CN101627661B CN101627661B (en) | 2012-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008800066675A Active CN101627660B (en) | 2007-03-12 | 2008-03-11 | Induction cooking device |
| CN2008800068100A Active CN101627661B (en) | 2007-03-12 | 2008-03-11 | Induction cooking device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008800066675A Active CN101627660B (en) | 2007-03-12 | 2008-03-11 | Induction cooking device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110500622A (en) * | 2013-07-16 | 2019-11-26 | 肖特公开股份有限公司 | Stove equipment with cooktop surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| ES2590428B1 (en) * | 2015-05-21 | 2017-09-07 | Bsh Electrodomésticos España, S.A. | Cooking battery and cooking system |
| ES2590381B1 (en) | 2015-05-21 | 2017-09-07 | Bsh Electrodomésticos España, S.A. | Cooking battery |
| DE102019211283A1 (en) * | 2019-07-30 | 2021-02-04 | BSH Hausgeräte GmbH | Kitchen machine and method for increasing the safety of a kitchen machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4125646B2 (en) * | 2003-07-04 | 2008-07-30 | 松下電器産業株式会社 | Induction heating device |
| JP4123085B2 (en) * | 2003-07-17 | 2008-07-23 | 松下電器産業株式会社 | Induction heating cooker |
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|---|---|---|---|---|
| CN110500622A (en) * | 2013-07-16 | 2019-11-26 | 肖特公开股份有限公司 | Stove equipment with cooktop surface |
Also Published As
| Publication number | Publication date |
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| CN101627661B (en) | 2012-05-23 |
| CN101627660A (en) | 2010-01-13 |
| CN101627660B (en) | 2012-06-06 |
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