CN101307924B - Electromagnetic oven with magnetic induction temperature measuring device - Google Patents
Electromagnetic oven with magnetic induction temperature measuring device Download PDFInfo
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- CN101307924B CN101307924B CN200810028622XA CN200810028622A CN101307924B CN 101307924 B CN101307924 B CN 101307924B CN 200810028622X A CN200810028622X A CN 200810028622XA CN 200810028622 A CN200810028622 A CN 200810028622A CN 101307924 B CN101307924 B CN 101307924B
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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
Abstract
An electromagnetic oven with a magnetic induction temperature measuring device comprises an electromagnetic oven shell, an electromagnetic oven platen, a heating coil and a control circuit, and is characterized in that a temperature measuring induction coil is further arranged at a position below the electromagnetic oven platen and close to the heating coil and used for converting a magnetic signal generated by a magnetic temperature sensing element above the electromagnetic oven platen at a set temperature point into an electric signal and outputting the electric signal, and a temperature measuring circuit is additionally arranged in the electromagnetic oven control circuit and mainly comprises the temperature measuring induction coil and an electric signal judging circuit, the temperature measuring induction coil is connected with the electric signal judging circuit, and the electric signal judging circuit is further connected with an output control circuit so that a control program of the electromagnetic oven can be correspondingly converted. The invention adopts a non-contact method to detect the temperature of the electromagnetic cooker, and can realize automatic, flexible and accurate control of multipoint temperature of the electromagnetic oven in the cooking process.
Description
Technical field
The present invention relates to a kind of electromagnetic oven, particularly a kind of electromagnetic oven that is provided with the magnetic induction temperature measuring equipment.
Background technology
Electromagnetic oven is to utilize electromagnetism pot that electromagnetic field makes ferromagnetic material as load directly heating and the household electrical appliance of cooking.In the prior art, comprise contact temperature detection method and contactless temperature checking method to adopting in the temperature controlled processes of electromagnetic oven.Wherein, the contact temperature detection method is to utilize the temperature in the electromagnetism the bottom of a pan to conduct by the electromagnetic oven platen to carry out temperature controlled to the mode of temperature-sensitive element, its weak point is: because the poor thermal conductivity of electromagnetic oven platen, the temperature in the electromagnetism the bottom of a pan is difficult to assurance and passes to temperature-sensitive element accurately and timely, especially can not accurately and timely obtain signal by temperature-sensitive element at certain specific temperature spot, be difficult to realize temperature accurately and automatically the controlling in cooking process of electromagnetism pot.
Existing contactless temperature checking method is to utilize the quick demagnetization principle of sensing magnet steel to carry out temperature controlled: on the bottom of electromagnetism pot or electromagnetic oven platen sensing magnet steel is set, when the temperature of sensing magnet steel is higher than Curie temperature, sensing magnet steel just can lose magnetism, at this moment, detect the variation of sensing magnet steel magnetic with magnetic sensor and carry out temperature survey, it as disclosed application number 200610036568.4 Chinese patent application, the supporting sensing magnet steel of magneto-dependent sensor is set replaces conduction of contact heat and temperature-sensitive element induction mode temperature sensor to change, have and detect accurately, advantage timely, it is inaccurate and react slow defective to have overcome aforesaid contact temperature detection method.But, because electromagnetic oven is to send powerful magnetic force by heater coil to heat the electromagnetism pot, therefore, when the heater coil heating work, the detection of the magnetic signal that magneto-dependent sensor sent sensing magnet steel can be disturbed in its powerful magnetic field on the temperature spot of setting, therefore, must adopt programme-control simultaneously with heater coil short time deenergization, after the magnetic field disappearance in heating electromagnetism pot, allow magneto-dependent sensor between the heater coil turnoff time, detect, after testing is finished, the heater coil work of switching on again, this process circulates down always, till magneto-dependent sensor detects the signal that temperature spot took place of electromagnetism pot in a certain setting.So there is following defective in this technical scheme: (1) will often disconnect the power supply of heater coil in order to guarantee the normal detection of magneto-dependent sensor, is unfavorable for the normal heating work of electromagnetic oven; (2) time of the power supply disconnect heater coil first being set in heating process can be different different because of the component of heat food, therefore, be difficult to comparatively proper time point is set at all situations, situation about having set early for power-off time point, cutting off the power supply, number of times can increase and detection time is long, can influence the efficiency of heating surface; (3) the frequent switch motion of the high power valve of electromagnetic oven or power model brings impact to control system, can influence the service life of control system; (4) be difficult to a plurality of temperature spots is detected: because different cooking process requires the different temperature spot of control, be not all cooking process all require to reach curie point thereby can't carry out flexibly desired multi-point temp in the electromagnetic oven cooking process, exactly control, temperature detection is still limited to.
Summary of the invention
The purpose of this invention is to provide a kind of electromagnetic oven and magnetic induction temp measuring method thereof that is provided with temperature measuring equipment, adopt non-contacting method to detect the temperature of electromagnetism pot, when detecting the temperature of electromagnetism pot, temperature measuring equipment need not to disconnect the power supply of heater coil, and can the temperature spot of a plurality of settings of electromagnetism pot be detected, make control program make corresponding conversion, can realize electromagnetic oven in cooking process multi-point temp automatically, flexibly, accurately control.
Purpose of the present invention can realize by following technical measures: a kind of electromagnetic oven that is provided with the magnetic induction temperature measuring equipment, comprise the electromagnetic oven housing, the electromagnetic oven platen, heater coil and control circuit, it is characterized in that in the electromagnetic oven control circuit, setting up temperature measurement circuit, this temperature measurement circuit mainly is made of thermometric induction coil and signal of telecommunication judging circuit, described thermometric induction coil links to each other with signal of telecommunication judging circuit, signal of telecommunication judging circuit is connected with output control circuit again, described thermometric induction coil is arranged on the position of described electromagnetic oven platen below near heater coil, and produce electrical signal of reaction with heater coil coupling, under the situation of heater coil work, the magnetic temperature-sensing element that described thermometric induction coil is subjected to electromagnetic oven platen top produces the corresponding signal of telecommunication in the effect of magnetic influence of the corresponding varying strength of different temperature points, determine the variations in temperature of magnetic temperature-sensing element by the size that detects the signal of telecommunication that the thermometric induction coil produces, determine the size of the signal of telecommunication that the thermometric induction coil produced and export to control circuit by signal of telecommunication judging circuit, make the control program of electromagnetic oven make corresponding conversion.
Its operation principle is: when the heater coil of electromagnetic oven is worked, can produce the alternating magnetic field of certain intensity, when alternating magnetic field passes through magnetic temperature-sensing element and thermometric induction coil, produce alternating voltage, electric current in the thermometric induction coil, promptly produce the signal of telecommunication.When the temperature of magnetic temperature-sensing element during with the vessel for electromagnetic cooker variations in temperature, the magnetic intensity of magnetic temperature-sensing element changes, then the magnetic flux of thermometric induction coil changes with regard to corresponding, and then cause the voltage or the signals of telecommunication such as electric current, pulse width at thermometric induction coil two ends to change, hence one can see that, the alternating voltage of thermometric induction coil or the size of the signals of telecommunication such as electric current, pulse width are influenced by the height of vessel for electromagnetic cooker temperature can, and can exist a temperature-sensitive to detect the zone in magnetic field near heater coil.Therefore, under the situation of electromagnetic oven operate as normal,, just can detect the variations in temperature of magnetic temperature-sensing element by detecting the size of the signal of telecommunication that the thermometric induction coil produces.Because the different temperature points correspondence of magnetic temperature-sensing element the magnetic of varying strength, can produce the corresponding signal of telecommunication in the thermometric induction coil simultaneously, so can also set a plurality of temperature spots according to the requirement of the different cooking process of electromagnetic oven, the multi-point temp that determines the magnetic temperature-sensing element by the size that detects the signal of telecommunication that the thermometric induction coil produces changes, thereby realizes the automatic control of electromagnetic oven.
Thermometric induction coil of the present invention is positioned near heater coil and the magnetic temperature-sensing element, just passable in the zone that can produce temperature-sensitive detection magnetic field, because only in temperature-sensitive detected the zone in magnetic field, heater coil, thermometric induction coil and magnetic temperature-sensing element could interact.As, described thermometric induction coil can be positioned at a wherein side of heater coil.But from the convenient angle of implementing, the thermometric induction coil preferably is positioned at the central authorities of heater coil, because the magnetic line of force of heater coil centre is the strongest, the signal of telecommunication that the thermometric induction coil produces is also the strongest, easier being detected, in addition, when the electromagnetism pot of electromagnetic oven and carrying magnetic temperature-sensing element matches, the location of convenient electromagnetism pot and magnetic temperature-sensing element.
Magnetic temperature-sensing element of the present invention can be fixed on the upper surface of electromagnetic oven platen, can directly contact with the electromagnetism pot, and during electromagnetic oven work, the temperature of electromagnetism pot is conducted on the magnetic temperature-sensing element.Described electromagnetic oven can also use by supporting specific electromagnetism pot, and promptly described magnetic temperature-sensing element is directly arranged in matching used electromagnetism pot bottom.
The magnetic temperature-sensing element that magnetic temperature-sensing element of the present invention can be a Ferrite Material; Described magnetic temperature-sensing element can also be a sensing magnet steel, as the sensing magnet steel of non-crystalline material or the sensing magnet steel of nanocrystalline material; The magnetic temperature-sensing element that described magnetic temperature-sensing element can also be an alloy material, or the magnetic temperature-sensing element of rare earth material.
Electromagnetic oven control circuit of the present invention is the improvement of doing on the basis of existing technology, and electromagnetic oven control circuit prior art generally comprises power circuit, output control circuit, current detection circuit, temperature protection circuit, output regulating circuitry, display circuit and holding circuit etc.Electromagnetic oven control circuit of the present invention has been set up temperature measurement circuit, during electromagnetic oven work, signal of telecommunication judging circuit can determine the size of the signal of telecommunication that the thermometric induction coil produced and export to output control circuit, thereby realizes the automatic control to the electromagnetic oven cooking process.Signal of telecommunication judging circuit of the present invention can be voltage judging circuit or current judgement circuit, or other signals of telecommunication (frequency, pulse width etc.) judging circuit, as: voltage comparator circuit, A/D circuit, pulse width measurement circuit etc.
The present invention can do following improvement, and described temperature measurement circuit can also comprise current rectifying and wave filtering circuit, and the alternate electrical signal that the thermometric induction coil produces can become dc signal by after the current rectifying and wave filtering circuit, outputs to signal discrimination circuit.
During electromagnetic oven work, the alternate electrical signal that described thermometric induction coil produces, produce DC voltage or DC current as voltage or electric current through current rectifying and wave filtering circuit, after DC voltage or DC current were input to voltage or current judgement circuit, voltage or current judgement circuit just can determine the size of DC voltage or electric current.Because the size of the signal of telecommunication is the influence that is subjected to the magnetic intensity size of magnetic temperature-sensing element, magnetic is strong more, and the signal of telecommunication is big more, and magnetic is weak more, the signal of telecommunication more little (referring to Fig. 1).The magnetic intensity size of magnetic temperature-sensing element is again the influence that is subjected to the temperature height of electromagnetism pot, therefore, described magnetic induction temperature measurement circuit can determine the height of electromagnetism pot temperature, and the relation of the temperature and the signal of telecommunication has two kinds of positive temperature coefficient relation and negative temperature coefficient relations, referring to Fig. 2 and Fig. 3, wherein, Figure 2 shows that the situation of positive temperature coefficient relation, promptly temperature is high more, the signal of telecommunication is strong more, Figure 3 shows that the situation of negative temperature coefficient relation, promptly temperature is high more, and the signal of telecommunication is weak more.Shown in Figure 11 is the situation that one of them embodiment of the present invention adopts the negative temperature coefficient relation, graph of relation for electromagnetic oven temperature of boiler and DC voltage (electric current), as can be seen, when the temperature of electromagnetism pot reaches a certain temperature, magnitude of voltage changes to a certain magnitude of voltage X volt, and when being 105 ℃ as a certain temperature, this temperature is the meal temperature of boiling just, therefore, this temperature spot is set and can be used for realizing the electromagnetic oven temp sensing function of cooking.In like manner, described temperature measurement circuit can determine the variation of a plurality of temperature spots of vessel for electromagnetic cooker, makes control program make corresponding conversion, thereby satisfies other culinary art requirement of electromagnetic oven.What specify is that Fig. 1～3 and Figure 11, relation curve shown in Figure 14 can be straight lines, also can be curves.
The present invention can also do following improvement, field circuit also is set in the electromagnetic oven control circuit, described field circuit can carry out excitation to the thermometric induction coil, between thermometric induction coil and magnetic temperature-sensing element, form one and detect magnetic field, like this, under the idle situation of heater coil, also can detect the temperature of electromagnetism pot.In the present invention, described field circuit mainly is made up of magnet exciting coil, and magnet exciting coil can be arranged on thermometric induction coil next door, also can be nested together with the thermometric induction coil is coaxial.Thermometric induction coil of the present invention and magnet exciting coil coupling can produce electrical signal of reaction.When heater coil is worked, can carry out excitation to the thermometric induction coil by heater coil, form one and detect magnetic field, when heater coil is not worked, the thermometric induction coil is carried out excitation by magnet exciting coil, form one and detect magnetic field.Promptly in the above two kinds of cases, the thermometric induction coil can both produce electrical signal of reaction.
The magnetic induction temp measuring method of electromagnetic oven of the present invention, be included in heater coil and control circuit are set in the electromagnetic oven housing, it is characterized in that in the electromagnetic oven control circuit, setting up temperature measurement circuit, this temperature measurement circuit mainly is made of thermometric induction coil and signal of telecommunication judging circuit, described thermometric induction coil is provided with the position of described electromagnetic oven platen below near heater coil, under the situation of electromagnetic oven operate as normal, utilize the alternating magnetic field of the heater coil generation of electromagnetic oven, make the thermometric induction coil produce the alternating voltage electric current; When the magnetic temperature-sensing element changes its magnetic field intensity because of variations in temperature, the voltage or the signals of telecommunication such as electric current, pulse width at thermometric induction coil two ends change, the size of the signal of telecommunication that produces by the detected temperatures induction coil is differentiated the variations in temperature of magnetic temperature-sensing element, determine the size of the signal of telecommunication that the thermometric induction coil produced and export to control circuit by signal of telecommunication judging circuit, make the control program of electromagnetic oven make corresponding conversion.
The present invention compared with prior art has following advantage:
(1) electromagnetic oven of the present invention adopts contactless temperature measuring equipment detected temperatures, be different from the detection of the magnetic signal that in the prior art magnetic temperature-sensing element is sent, temperature measuring equipment of the present invention need not to disconnect the power supply of heater coil when detecting, be the magnetic field that produces when having utilized the electromagnetic oven heating coil working on the contrary, when passing through the thermometric induction coil, this magnetic field produces the signal of telecommunication, only need detect and get final product the signal of telecommunication, can realize survey indirectly according to the corresponding relation of the temperature of electromagnetism pot and the signal of telecommunication to temperature, measure accurately, simple and practical, be easy to realize.
(2) contactless temperature-measuring device of the present invention not only can utilize the Curie-point temperature of magnetic temperature-sensing element as the detected temperatures point, but also can utilize before the curie point of magnetic temperature-sensing element temperature section, thereby satisfy more various culinary art requirement of electromagnetic oven as a plurality of programme controlled temperature spot of detected temperatures point setting.
(3) the magnetic temperature-sensing element that the present invention relates to can be arranged on the upper surface of electromagnetic oven platen, can also append on the matching used electromagnetism pot, makes the enforcement of the present invention can be versatile and flexible, helps to widen the purposes of electromagnetism pot and electromagnetic oven.
(4) electromagnetic oven of the present invention can design accurate automatic control program, not only can reach the effect identical with auto-electric cooker using pottery, can also realize other cooking function of setting, has further improved the automaticity of electromagnetic oven.
(5) the magnetic induction temperature measuring equipment on the electromagnetic oven of the present invention can also be applied in the daily electrical heated appliances such as electric cooker, electric water-boiling device, electric soup cooker, electric pressure cooker, can increase work efficiency greatly, makes control procedure more comprehensively, reliably.
Description of drawings
Fig. 1 is the magnetic intensity of magnetic temperature-sensing element of the present invention and the graph of relation of the signal of telecommunication;
The graph of relation (positive temperature coefficient) of the vessel for electromagnetic cooker temperature and signal of telecommunication when Fig. 2 is electromagnetic oven of the present invention work;
The graph of relation (negative temperature coefficient) of the vessel for electromagnetic cooker temperature and signal of telecommunication when Fig. 3 is electromagnetic oven of the present invention work;
Fig. 4 is the main pseudosection of the electromagnetic oven of the embodiment of the invention 1;
Fig. 5 is the electromagnetic oven control circuit theory diagram of the embodiment of the invention 1;
Fig. 6 is the temperature measurement circuit schematic diagram that has the pulse signal judging circuit of the embodiment of the invention 1;
Fig. 7 is the main pseudosection of the electromagnetic oven of the embodiment of the invention 2;
Fig. 8 is the electromagnetic oven control circuit theory diagram of the embodiment of the invention 2;
Fig. 9 is the temperature measurement circuit schematic diagram that has current rectifying and wave filtering circuit of the embodiment of the invention 2;
Figure 10 is the field circuit schematic diagram of the embodiment of the invention 2;
Figure 11 is that the electromagnetic oven of the embodiment of the invention 2 is realized cooking, heat insulation function and the temperature of boiler during the boiling water function and the graph of relation of DC voltage (electric current) automatically;
Figure 12 is the main pseudosection of the electromagnetic oven of the embodiment of the invention 3;
Figure 13 is the temperature measurement circuit schematic diagram that has voltage comparator circuit of the embodiment of the invention 3;
Figure 14 be the electromagnetic oven of the embodiment of the invention 3 when realizing automatic Baoshang function temperature of boiler and the graph of relation of DC voltage (electric current).
The specific embodiment
Embodiment 1
As Fig. 4, Fig. 5, the electromagnetic oven that is provided with the magnetic induction temperature measuring equipment shown in Figure 6 is one of embodiment of the invention, comprise electromagnetic oven housing 2, electromagnetic oven platen 3, heater coil 4 and control circuit, control circuit comprises control panel 1 and drive plate 8, the central authorities of heater coil 4 are provided with support 5, on this support 5 thermistor 7 are housed.Electromagnetic oven platen 3 belows also are provided with thermometric induction coil 6, be used for the magnetic signal that the magnetic temperature-sensing element 10 of electromagnetic oven platen 3 tops produces on the temperature spot of setting is converted to the signal of telecommunication and output, this thermometric induction coil 6 and heater coil 4 couplings can produce electrical signal of reaction.Thermometric induction coil 6 is positioned near heater coil 4 and the magnetic temperature-sensing element 10, can produces the zone that temperature-sensitive detects magnetic field, and in the present embodiment, thermometric induction coil 6 is fixed on a wherein side of heater coil 4 by another support 5a.
Magnetic temperature-sensing element 10 in the present embodiment adopts the sensing magnet steel of non-crystalline material, it is fixed on the upper surface of electromagnetic oven platen 3, and be positioned at thermometric induction coil 6 directly over, because thermometric induction coil 6 is positioned at the next door of the heater coil that occupy the platen middle part, therefore, promptly sensing magnet steel is not to be located on the centre of electromagnetic oven platen 3.The contact-making surface of sensing magnet steel and electromagnetism pot 9 bottoms is because the restriction of machining accuracy, often uneven, cause heat transfer efficiency low, temperature conduction is not accurate enough, influence the testing result of temperature measuring equipment, therefore, between the bottom of sensing magnet steel and electromagnetism pot 9, also be provided with one deck thermal conductive silicon glue-line 11, to guarantee that testing result promptly and accurately.When using electromagnetic oven, the thermal conductive silicon glue-line 11 of sensing magnet steel top contacts with the bottom of a pan of electromagnetism pot 9.
The electromagnetic oven control circuit of present embodiment is the improvement of doing on the basis of existing technology; as shown in Figure 5, the electromagnetic oven control circuit comprises power circuit, output control circuit, current detection circuit, temperature protection circuit, output regulating circuitry, display circuit and holding circuit etc.In the present invention, set up temperature measurement circuit, this temperature measurement circuit comprises thermometric induction coil 6 and signal of telecommunication judging circuit, and thermometric induction coil 6 links to each other with signal of telecommunication judging circuit, signal of telecommunication judging circuit is connected with output control circuit again, makes the control program of electromagnetic oven make corresponding conversion.Referring to Fig. 6, the signal of telecommunication judging circuit in the present embodiment adopts the pulse signal judging circuit, as pulse width measurement circuit.Thermistor 7 sides still are connected with temperature protection circuit, carry out the task of common temperature control of the prior art and the warm safeguard protection of limit.
During electromagnetic oven work, heater coil 4 produces the alternating magnetic field of certain intensity, alternating magnetic field is during by sensing magnet steel and thermometric induction coil 6, in thermometric induction coil 6, produce the signal of telecommunication---pulse width, the pulse width that the pulse signal judging circuit directly produces thermometric induction coil 6 is as judgment signal, differentiate the size and the output of pulse width, corresponding control programs correspondingly is set in output control circuit, make electromagnetic oven do the operation of conversion program, thereby realize automatic control the electromagnetic oven cooking process to the temperature that sets.
Embodiment 2
As Fig. 7, Fig. 8, Fig. 9, Figure 10, the electromagnetic oven that is provided with the magnetic induction temperature measuring equipment shown in Figure 11 is two of the embodiment of the invention, as different from Example 1, thermometric induction coil 6 is positioned at the central authorities of heater coil 4, magnetic temperature-sensing element 10 adopts the heat sensitive ferrite material, during electromagnetic oven work, under the identical condition of magnetic field intensity, by the magnetic flux maximum of thermometric induction coil 6.Thermometric induction coil 6 is fixed on the below of electromagnetic oven platen 3 with thermistor 7 by support 5.Support 5 is that a longitudinal cross-section is step-like grillage, and thermistor 7 is fixed on its high one deck grillage, and thermometric induction coil 6 is fixed on its low one deck grillage.Magnetic temperature-sensing element 10 is fixed on the upper surface of electromagnetic oven platen 3 between two parties, and is corresponding with the position of thermometric induction coil 6.When using electromagnetic oven, magnetic temperature-sensing element 10 directly contacts with the bottom of electromagnetism pot 9.The magnetic induction temperature measurement circuit of electromagnetic oven also comprises current rectifying and wave filtering circuit, and the input of current rectifying and wave filtering circuit links to each other with thermometric induction coil 6, and output links to each other with signal of telecommunication judging circuit.Signal of telecommunication judging circuit in the present embodiment is the voltage judging circuit, as the A/D circuit.
It below is the process that realizes the cooking of electromagnetic oven, heat insulation function in the present embodiment by the magnetic induction temperature measuring equipment.During electromagnetic oven work, referring to Fig. 9, the alternating voltage that thermometric induction coil 6 produces produces DC voltage through current rectifying and wave filtering circuit, and DC voltage is input to the voltage judging circuit, promptly be input to the A/D interface of output control circuit, the A/D circuit just can determine the size of DC voltage.The magnetic of magnetic temperature-sensing element 10 is strong more, and the signal of telecommunication that thermometric induction coil 6 is produced is big more; Otherwise magnetic is weak more, and the signal of telecommunication is more little.Present embodiment adopts negative temperature coefficient, and promptly the temperature of electromagnetism pot is high more, and the signal of telecommunication is more little.When program is cooked in the electromagnetic oven startup, Mi Heshui in the electromagnetic oven heating electromagnetism pot 9, after meal is boiled dry, when the temperature of meal reaches 105 ℃, when the magnitude of voltage that thermometric induction coil 6 produces changes to a certain magnitude of voltage X volt, when the voltage judging circuit is experienced this X volt magnitude of voltage, referring to Figure 11, transmit signal to output control circuit at once, disconnect the heater circuit of electromagnetic oven, then electromagnetic oven stops heating, thereby realizes the temp sensing function of cooking of electromagnetic oven.
In the present embodiment, in the electromagnetic oven control circuit, also be provided with the field circuit that can carry out excitation to thermometric induction coil 6, promptly be provided with magnet exciting coil 12 on thermometric induction coil 6 next doors, thermometric induction coil 6 and magnet exciting coil 12 couplings, can produce electrical signal of reaction, magnet exciting coil 12 can be provided power supply and thermometric induction coil 6 is carried out excitation by output control circuit.As shown in Figure 7 and Figure 8, when heater coil 4 work, carry out excitation by 4 pairs of thermometric induction coils of heater coil 6, form one and detect magnetic field between thermometric induction coil 6 and magnetic temperature-sensing element 10, this moment, field circuit was not worked; When heater coil 4 is not worked, by field circuit thermometric induction coil 6 is carried out excitation, between thermometric induction coil 6 and magnetic temperature-sensing element 10, form one and detect magnetic field, thermometric induction coil 6 can change according to the magnetic of magnetic temperature-sensing element 10, the output correspondent voltage, temperature detection when realizing that heater coil 4 is not worked promptly also can detect the temperature of electromagnetism pot under the situation of the heater circuit outage of electromagnetic oven.According to this design, under heater coil 4 idle situations, field circuit carries out excitation to thermometric induction coil 6 and forms a detection magnetic field, referring to Figure 11, when the temperature of electromagnetism pot 9 during less than 70 ℃, when the magnitude of voltage that thermometric induction coil 6 produces changes to a certain magnitude of voltage Y volt, the voltage judging circuit is experienced this Y volt magnitude of voltage, transmit signal to output control circuit at once, open the heater circuit of electromagnetic oven again, then the electromagnetism pot enters keeping warm mode, promptly start heater coil 4 small-powers energisings (or intermittently power-on), at this moment, field circuit is not worked, and carries out excitation by 4 pairs of thermometric induction coils of heater coil 6; After the temperature of electromagnetism pot 9 reached the insulation ceiling temperature that sets, electromagnetic oven disconnected heater circuit again, to realize the heat insulation function of electromagnetic oven.
Can also realize the automatic boiling water function of electromagnetic oven in the present embodiment by temperature measuring equipment, during electromagnetic oven work, start the boiling water program, electromagnetic oven heats the water in the electromagnetism pot 9, the control circuit of electromagnetic oven can be provided with the program of the measuring and calculating rate of heat addition in output regulating circuitry, the changing value of the voltage that produces by thermometric induction coil 6 is as the basic parameter of the measuring and calculating rate of heat addition, the rate of heat addition is inversely proportional to the weight of the interior water of pot body, it is more little to be that water is added hot speed more, and required heat time heating time is long more.
Referring to Figure 11, in the present embodiment water temperature reached 98 ℃ of (nonspecific values,＜100 ℃ all can) time as the start-up point of conversion program, when the voltage judging circuit obtains magnitude of voltage V1 volt that thermometric induction coil 6 produced when water temperature is 98 ℃, transmit signal to output control circuit, output regulating circuitry is promptly controlled electromagnetic oven and is entered the time-delay state at once, the rate of heat addition of measuring and calculating and current temperature value are foundation during with heating, control program can be determined the time T 1 of water to the required time-delay of seething with excitement, when delaying time T1, water comes to life, and the control program of electromagnetic oven is made the operation of conversion program, stops heating.Make electromagnetic oven avoid water to be in the state of long-time boiling, promptly avoid boiling dry the water in the pot, guarantee safety, again can energy savings, easily realize automatic boiling water.
As Figure 12, Figure 13, the electromagnetic oven that is provided with temperature measuring equipment shown in Figure 14 is three of the embodiment of the invention, different is with embodiment 2, magnetic temperature-sensing element 10 is the sensing magnet steel of nanocrystalline material, the supporting specific electromagnetism pot 9 of electromagnetic oven uses, magnetic temperature-sensing element 10 is directly arranged in matching used double-deck electromagnetism pot 9 bottoms that have, electromagnetism pot 9 has outer casing 91 and internal layer shell 92, and the electromagnetism pot heat of this kind structure is difficult for scattering and disappearing better heat preservation.Magnetic temperature-sensing element 10 is located between the two-layer housing, and promptly the outer casing 91 of electromagnetism pot 9 bottoms directly contacts with electromagnetic oven platen 3, and in order to guarantee magnetic temperature-sensing element 10 operate as normal, outer casing 91 can adopt nonmetallic materials to make.Signal of telecommunication judging circuit in the present embodiment is a voltage comparator circuit.
In the present embodiment, realize the automatic Baoshang function of electromagnetic oven by temperature measuring equipment: during electromagnetic oven work, referring to Figure 13, the alternating voltage that thermometric induction coil 6 produces produces DC voltage through current rectifying and wave filtering circuit, DC voltage is input to the voltage judging circuit, promptly be input to voltage comparator circuit, voltage comparator circuit just can determine the size and the output of DC voltage.Start the Baoshang program, electromagnetic oven adopts the soup stock in the high-power heating electromagnetism pot 9 earlier, with embodiment 2 identical be, the control circuit of electromagnetic oven has the program of the rate of heat addition of the water in the measuring and calculating pot body, can carry out the measuring and calculating of the rate of heat addition by the voltage change that thermometric induction coil 6 produces, referring to Figure 14, water temperature in the electromagnetism pot 9 is reached 98 ℃ of (nonspecific values,＜100 ℃ all can) time thermometric induction coil 6 voltage V1 that produces as the start-up point of conversion program, when the voltage comparator circuit in the temperature measurement circuit is experienced this V1 volt magnitude of voltage, transmit signal to output control circuit, control circuit control electromagnetic oven enters the time-delay state at once, and be parameter with the rate of heat addition of when heating measuring and calculating, determine the delay time T1 of the next program of conversion, when electromagnetic oven is delayed time T1, soup seethes with excitement, control circuit control electromagnetic oven stops high-power heating, changes the small-power heated condition over to, can keep soup in the electromagnetism pot and keep fluidized state to be unlikely again allowing soup roll out outside the pot.This state keeps always, and till the Baoshang of the setting time regularly, electromagnetic oven just quits work, and realizes the automatic Baoshang function of electromagnetic oven.
In the foregoing description, magnetic temperature-sensing element 10 can also be the magnetic temperature-sensing element of other material, as the magnetic temperature-sensing element of alloy material, or the magnetic temperature-sensing element of rare earth material.The bottom of a pan of electromagnetism pot except with magnetic temperature-sensing element 10 contacted parts, remainder both can contact with electromagnetic oven platen 3, heater coil 4 and thermometric induction coil 6 can not contact, as long as can be sensed the magnetic temperature-sensing element 10 in the bottom of a pan yet with electromagnetic oven platen 3.
The various cooking process of the electromagnetic oven in the foregoing description, as cook, boiling water, Baoshang etc., can carry out flexible combination according to the designing requirement of electromagnetic oven, the temperature measuring equipment of electromagnetic oven realizes that the principle of above-mentioned cooking process is identical with process.
Temperature measuring equipment in the electromagnetic oven of the present invention can also be widely used in electric cooker, electric water-boiling device, electric soup cooker, the electric pressure cooker, traditional heat-generating disc/heat-generating pipe mode of heating is become the heating of heater coil electromagnetism, can improve culinary art efficient, make control procedure more comprehensively, reliably.
Claims (11)
1. electromagnetic oven that is provided with the magnetic induction temperature measuring equipment, comprise electromagnetic oven housing (2), electromagnetic oven platen (3), heater coil (4) and control circuit, it is characterized in that in the electromagnetic oven control circuit, setting up temperature measurement circuit, this temperature measurement circuit mainly is made of thermometric induction coil (6) and signal of telecommunication judging circuit, described thermometric induction coil (6) links to each other with signal of telecommunication judging circuit, and signal of telecommunication judging circuit is connected with output control circuit again; Described thermometric induction coil (6) is arranged on the position of described electromagnetic oven platen (3) below near heater coil, and produce electrical signal of reaction with heater coil (4) coupling, under the situation of heater coil work, the magnetic temperature-sensing element (10) that described thermometric induction coil (6) is subjected to electromagnetic oven platen (3) top produces the corresponding signal of telecommunication in the effect of magnetic influence of the corresponding varying strength of different temperature points, determine the variations in temperature of magnetic temperature-sensing element (10) by the size that detects the signal of telecommunication that thermometric induction coil (6) produces, determine the size of the signal of telecommunication that thermometric induction coil (6) produced and export to control circuit by signal of telecommunication judging circuit, make the control program of electromagnetic oven make corresponding conversion.
2. a kind of electromagnetic oven that is provided with the magnetic induction temperature measuring equipment according to claim 1 is characterized in that described thermometric induction coil (6) is positioned near heater coil (4) and the magnetic temperature-sensing element (10), in the zone that can produce temperature-sensitive detection magnetic field.
3. a kind of electromagnetic oven that is provided with the magnetic induction temperature measuring equipment according to claim 2 is characterized in that described thermometric induction coil (6) is positioned at a wherein side of heater coil (4).
4. a kind of electromagnetic oven that is provided with the magnetic induction temperature measuring equipment according to claim 2 is characterized in that described thermometric induction coil (6) is positioned at the central authorities of heater coil (4).
5. according to claim 3 or 4 described a kind of electromagnetic ovens that are provided with the magnetic induction temperature measuring equipment, it is characterized in that described magnetic temperature-sensing element (10) is fixed on the upper surface of electromagnetic oven platen (3).
6. according to claim 3 or 4 described a kind of electromagnetic ovens that are provided with the magnetic induction temperature measuring equipment, it is characterized in that described magnetic temperature-sensing element (10) is directly arranged in matching used electromagnetism pot (9) bottom.
7. according to claim 3 or 4 described a kind of electromagnetic ovens that are provided with the magnetic induction temperature measuring equipment, it is characterized in that described magnetic temperature-sensing element (10) is directly arranged in matching used double-deck electromagnetism pot (9) bottom that has, described electromagnetism pot (9) has outer casing (91) and internal layer shell (92), magnetic temperature-sensing element (10) is located between the two-layer housing, and promptly the outer casing (91) of electromagnetism pot (9) bottom directly contacts with electromagnetic oven platen (3).
8. according to claim 1 or 2 or 3 or 4 described a kind of electromagnetic ovens that are provided with the magnetic induction temperature measuring equipment, it is characterized in that described magnetic temperature-sensing element (10) is the magnetic temperature-sensing element of Ferrite Material.
9. according to claim 1 or 2 or 3 or 4 described a kind of electromagnetic ovens that are provided with the magnetic induction temperature measuring equipment, it is characterized in that described magnetic temperature-sensing element (10) is a sensing magnet steel.
10. a kind of electromagnetic oven that is provided with the magnetic induction temperature measuring equipment according to claim 1, it is characterized in that described temperature measurement circuit also comprises current rectifying and wave filtering circuit, the input of current rectifying and wave filtering circuit links to each other with thermometric induction coil (6), and output links to each other with signal of telecommunication judging circuit.
11. the magnetic induction temp measuring method of an electromagnetic oven, be included in heater coil (4) and control circuit are set in the electromagnetic oven housing (2), it is characterized in that in the electromagnetic oven control circuit, setting up temperature measurement circuit, this temperature measurement circuit mainly is made of thermometric induction coil (6) and signal of telecommunication judging circuit, described thermometric induction coil (6) is provided with the position of described electromagnetic oven platen (3) below near heater coil, under the situation of electromagnetic oven operate as normal, utilize the alternating magnetic field of heater coil (4) generation of electromagnetic oven, make thermometric induction coil (6) produce the alternating voltage electric current; When magnetic temperature-sensing element (10) changes its magnetic field intensity because of variations in temperature, the voltage or the signals of telecommunication such as electric current, pulse width at thermometric induction coil (6) two ends change, the size of the signal of telecommunication that produces by detected temperatures induction coil (6) is differentiated the variations in temperature of magnetic temperature-sensing element (10), determine the size of the signal of telecommunication that thermometric induction coil (6) produced and export to control circuit by signal of telecommunication judging circuit, make the control program of electromagnetic oven make corresponding conversion.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810028622XA CN101307924B (en) | 2008-06-06 | 2008-06-06 | Electromagnetic oven with magnetic induction temperature measuring device |
| PCT/CN2009/072169 WO2009146663A1 (en) | 2008-06-06 | 2009-06-08 | Non-contact temperature detecting and controlling method of a cooker and electromagnetic oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810028622XA CN101307924B (en) | 2008-06-06 | 2008-06-06 | Electromagnetic oven with magnetic induction temperature measuring device |
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| Publication Number | Publication Date |
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| CN101307924A CN101307924A (en) | 2008-11-19 |
| CN101307924B true CN101307924B (en) | 2010-06-16 |
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| CN200810028622XA Expired - Fee Related CN101307924B (en) | 2008-06-06 | 2008-06-06 | Electromagnetic oven with magnetic induction temperature measuring device |
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| CN (1) | CN101307924B (en) |
| WO (1) | WO2009146663A1 (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101307924B (en) * | 2008-06-06 | 2010-06-16 | 叶小舟 | Electromagnetic oven with magnetic induction temperature measuring device |
| CN101929894A (en) * | 2009-06-19 | 2010-12-29 | 张华文 | Heat probe |
| CN101637354B (en) * | 2009-07-13 | 2014-04-02 | 叶小舟 | Electromagnetic rice cooker |
| WO2011120414A1 (en) * | 2010-03-31 | 2011-10-06 | Ye Xiaozhou | Contactless temperature detection method and device using the same |
| CN102235701A (en) * | 2010-03-31 | 2011-11-09 | 叶小舟 | Non-contact temperature measurement electromagnetic oven and temperature measuring method |
| CN102207411B (en) * | 2010-03-31 | 2014-10-15 | 叶小舟 | Non-contact temperature measurement method |
| CN102207299B (en) * | 2010-03-31 | 2013-07-31 | 叶小舟 | Automatic temperature control gas cooker and temperature control method |
| CN102679416B (en) * | 2011-03-17 | 2015-02-18 | 叶小舟 | Microwave oven adopting non-contact type electromagnetic induction temperature measurement and temperature measuring method |
| EP2590475B1 (en) * | 2011-11-04 | 2019-12-11 | BSH Hausgeräte GmbH | Induction heating device |
| CN107581919A (en) * | 2016-07-08 | 2018-01-16 | 肇庆市天宇进出口贸易有限公司 | A kind of cooker of controllable temperature and the method for controlling temperature |
| CN107726388A (en) * | 2016-08-23 | 2018-02-23 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic oven heating device |
| CN106765361A (en) * | 2017-03-27 | 2017-05-31 | 徐士刚 | A kind of intelligent electromagnetic oven |
| CN107280455B (en) * | 2017-07-12 | 2022-09-20 | 浙江绍兴苏泊尔生活电器有限公司 | Cooking utensil and cooking temperature control method |
| CN109100037B (en) * | 2018-07-25 | 2019-07-26 | 南京磊智电子科技有限公司 | Applied to the cooking bottom temperature measurement method of electromagnetic oven, apparatus and system |
| CN109387289A (en) * | 2018-11-20 | 2019-02-26 | 林向东 | A kind of contactless electromagnetic oven temperature detection device and electromagnetic oven |
| CN109340838A (en) * | 2018-12-17 | 2019-02-15 | 广东万家乐厨房科技有限公司 | Temperature control system and electromagnetism furnace module |
| CN112578828B (en) * | 2019-09-30 | 2022-06-14 | 张玮 | Temperature measuring method and device and heating equipment |
| CN112714513B (en) * | 2019-10-25 | 2023-01-31 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil, temperature measuring method thereof and computer readable storage medium |
| CN112714522B (en) * | 2019-10-25 | 2023-03-31 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating equipment and temperature measuring method and device thereof |
| CN113654676A (en) * | 2020-05-12 | 2021-11-16 | 佛山市顺德区美的电热电器制造有限公司 | Heating temperature measurement circuit, temperature measurement circuit and cooking device |
| CN113654678B (en) * | 2020-05-12 | 2022-10-28 | 佛山市顺德区美的电热电器制造有限公司 | Heating temperature measurement circuit, temperature measurement method thereof, cooking device and storage medium |
| CN114485978B (en) * | 2022-02-14 | 2022-10-25 | 湖南大学 | Non-contact temperature measurement method and device based on material conductivity-temperature characteristic |
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| WO2009146663A1 (en) | 2009-12-10 |
| CN101307924A (en) | 2008-11-19 |
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