CN206861632U - A kind of electromagnetic induction heating cooker - Google Patents

Abstract

An electromagnetic induction heating cooker, comprising a cooking container (200) and electromagnetic heating equipment; the cooking container (200) includes a heat-conducting metal layer (202) for forming the shape of the container and a soft magnetic material attached to the heat-conducting metal layer (202) layer (201); the electromagnetic heating device includes a supporting device (110) and a coil module for supporting the cooking container (200), and also includes a resonant capacitor (102) connected in parallel with the coil module to form an LC resonant circuit, and the coil There are multiple modules, which are arranged in parallel; the coil module includes an inductance coil disk (101) for generating an alternating magnetic field when energized so that the soft magnetic material layer (201) heats up and for detecting the cooking container (200) A non-contact switch circuit (111) that conducts in time to energize the inductance coil disk (101); the non-contact switch circuit (111) is arranged in series with the inductance coil disk (101). The electromagnetic induction heating cooker of the utility model has ingenious design and strong practicability.

Description

An electromagnetic induction heating cooker

technical field

The utility model relates to the field of cooking utensils, in particular to an electromagnetic induction heating cooking utensil.

Background technique

With the development of the economy, office workers usually eat in restaurants near their work places, and usually require restaurants to cook on the spot. In this case, there are gas ranges with multiple cooking ranges on the market. However, when multiple stoves are used at the same time, it is sometimes difficult for the chef to take into account the cooking status of all the stoves, and the dishes heated by some stoves often appear overheated. For the solution of this problem, it requires the gas range to have an accurate temperature control function, which cannot be achieved by the existing gas range.

In this case, the applicant thought of using an electromagnetic cooker instead of a gas cooker to precisely control the cooking temperature of dishes. However, the existing induction cooker is unable to heat a plurality of pots at the same time, let alone control the cooking temperature of the plurality of pots respectively.

Utility model content

Aiming at the above problems, the utility model proposes an electromagnetic induction heating cooker which can simultaneously heat a plurality of pots and control the cooking temperature of the plurality of pots respectively.

The technical scheme that the utility model proposes is as follows:

The utility model provides an electromagnetic induction heating cooker, which includes a cooking container and electromagnetic heating equipment; the cooking container includes a heat-conducting metal layer for forming the shape of the container and a soft magnetic material layer attached to the heat-conducting metal layer; the electromagnetic heating device It includes a supporting device and a coil module for supporting the cooking container, and also includes a resonant capacitor connected in parallel with the coil module to form an LC resonant circuit, and a resonant synchronous detection unit for adjusting the resonant frequency of the LC resonant circuit according to the material of the soft magnetic material layer , a resonance shift detection unit for detecting a resonance frequency shift of the LC resonance circuit through a high-speed counter and an arithmetic processor for calculating the temperature of the soft magnetic material layer according to the resonance frequency shift,

There are a plurality of coil modules, and the plurality of coil modules are arranged in parallel; the coil module includes an inductance coil disk for generating an alternating magnetic field when energized so that the soft magnetic material layer of the cooking container above it generates heat and for When it is detected that the cooking container is located above the induction coil disk, it is turned on to make the induction coil disk energized; the non-contact switch circuit is arranged in series with the induction coil disk.

In the above-mentioned electromagnetic induction heating cooker of the present utility model, there are one or more cooking containers.

In the above-mentioned electromagnetic induction heating cooker of the utility model, the induction coil disk is arranged under the support device; the distance between the support surface of the support device and the induction coil disk is 6 mm to 12 mm.

In the above-mentioned electromagnetic induction heating cooker of the utility model, the electromagnetic heating device also includes an electromagnetic induction heating switch device for providing a driving current to the LC resonant circuit, and is respectively connected with the electromagnetic induction heating switch device and an operation processor for receiving operation The control signal of the processor is used to control the electromagnetic switch driving unit of the driving current provided by the electromagnetic induction heating switch device.

In the above-mentioned electromagnetic induction heating cooker of the utility model, an electromagnetic waveform detection unit for detecting the electromagnetic induction waveform of the LC resonant circuit to protect the safety of the LC resonant circuit is connected between the arithmetic processor and the inductance coil disk; the electromagnetic waveform detection unit includes a A resonance current detection unit for detecting the resonance current of the LC resonance circuit and an energy balance detection unit for detecting the output power of the LC resonance circuit.

In the above-mentioned electromagnetic induction heating cooker of the utility model, the soft magnetic material layer is arranged at the bottom of the heat-conducting metal layer; the cooking container also includes a cooking application layer and an anti-sticking and anti-rust coating attached to the inner side of the heat-conducting metal layer in sequence.

In the above-mentioned electromagnetic induction heating cooker of the present invention, the cooking application layer is made of stainless steel or aluminum alloy.

In the electromagnetic induction heating cooker of the present invention, the heat-conducting metal layer includes a copper material layer with a thickness of at least 1mm, an aluminum material layer with a thickness of at least 2mm, or a cast iron layer with a thickness of at least 3mm.

In the above-mentioned electromagnetic induction heating cooker of the utility model, the supporting surface of the supporting device is provided with cooking positions corresponding to the coil modules one by one, and the induction coil plate is located below the cooking position; the four corners of the cooking position are respectively provided with limiting columns.

In the above-mentioned electromagnetic induction heating cooker of the utility model, the non-contact switch circuit includes a single-chip microcomputer, an infrared light-emitting diode, an infrared receiving diode, a first triode, a second triode and a relay; the model of the single-chip microcomputer is C8051F020, and the single-chip The AIN0.7 pin is connected to the power supply terminal through the infrared receiving diode in reverse; the P1.2 pin of the microcontroller is connected to the base of the first triode, and the collector of the first triode passes through the first protection resistor, and then reversed The infrared light-emitting diode is connected to the power supply terminal; the emitter of the first triode is grounded; the second protection resistor is connected between the emitter of the first triode and the base of the first triode; the first triode The emitter of the infrared receiving diode is connected to the negative pole of the infrared receiving diode through the third protection resistor; the P1.3 pin of the microcontroller is connected to the base of the second triode, and the collector of the second triode is connected to the power supply terminal through the fourth protection resistor The emitter of the second triode is grounded after passing through the coil part of the relay; the normally open switch of the relay is connected in series with the inductance coil plate, and the infrared light-emitting diode and the infrared receiving diode are respectively arranged on two limit posts of the same cooking position.

The electromagnetic induction heating cooker of the utility model uses the non-contact switch circuit to detect the result of the cooking container to power on and off the inductance coil, thereby realizing the switch control of heating multiple cookers. A variety of cooking containers with multiple layers can limit the upper limit of cooking temperature. The electromagnetic induction heating cooker of the utility model has ingenious design and strong practicability.

Description of drawings

The utility model will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 shows the schematic diagram of the circuit module of the electromagnetic induction heating cooker of the utility model embodiment;

Fig. 2 shows the schematic diagram of the cooking vessel of the electromagnetic induction heating cooker shown in Fig. 1;

Fig. 3 shows a schematic structural view of the electromagnetic induction heating cooker shown in Fig. 1;

Fig. 4 shows a circuit diagram of a non-contact switch circuit of the present invention.

detailed description

The technical problem to be solved by the utility model is that the existing electromagnetic oven cannot heat a plurality of pots at the same time, let alone control the cooking temperature of the plurality of pots respectively. The technical idea proposed by the utility model with respect to this technical problem is: to construct a coil module, which includes a non-contact switch circuit and an inductance coil disk arranged in series, and to provide the inductance coil with the result of detecting the cooking container by the non-contact switch circuit. The panel is turned on and off, so as to realize the on-off control of heating multiple pots, and at the same time, through various cooking containers with different formulations of soft magnetic material layers, the upper limit of the cooking temperature can be limited.

In order to make the technical purpose, technical scheme and technical effect of the utility model clearer, so that those skilled in the art can understand and implement the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 and FIG. 2 , FIG. 1 shows a schematic diagram of a circuit module of an electromagnetic induction heating cooker according to an embodiment of the present invention. Fig. 2 shows a schematic diagram of a cooking container of the electromagnetic induction heating cooker shown in Fig. 1 . The electromagnetic induction heating cooker includes a cooking container 200; the cooking container 200 includes a heat-conducting metal layer 202 for forming a container shape and a soft magnetic material layer 201 attached to the heat-conducting metal layer 202; in this embodiment, the soft magnetic material layer 201 It is arranged at the bottom of the heat-conducting metal layer 202 ; it can be understood that, in other embodiments, the soft magnetic material layer 201 can be arranged at the top of the heat-conducting metal layer 202 .

Further, the electromagnetic induction heating cooker further includes an electromagnetic heating device for providing an alternating magnetic field to the soft magnetic material layer 201 to generate a corresponding alternating current to raise the temperature. Here, when the temperature of the soft magnetic material layer 201 rises, it will heat the heat-conducting metal layer 202 through heat conduction, thereby realizing the cooking function of the electromagnetic induction heating cooker. Due to the material properties of the soft magnetic material layer 201, as the temperature of the soft magnetic material layer 201 increases, its relative permeability value will decrease. The variable magnetic field cannot heat up the soft magnetic material layer 201, so the upper limit of the cooking temperature of the cooking container is limited.

Further, the electromagnetic heating equipment includes a supporting device 110 for supporting and placing the cooking container 200 and a coil module arranged under the supporting device 110 for generating an alternating magnetic field to heat the soft magnetic material layer 201 when energized; as shown in FIG. 1 As shown in Fig. 3, there are a plurality of coil modules, and the plurality of coil modules are arranged in parallel; the coil module includes a soft magnetic material layer 201 for generating an alternating magnetic field when energized so that the cooking container 200 above it generates heat The inductance coil plate 101 and the non-contact switch circuit 111 for conducting when detecting that the cooking vessel 200 is located above the inductance coil plate 101 so that the inductance coil plate 101 is energized; the non-contact switch circuit 111 is connected in series with the inductance coil plate 101 set up. In this way, when a cooking container 200 is placed on any coil module, the coil module starts to work.

In this embodiment, as shown in FIG. 3 , cooking positions 112 corresponding to the coil modules are provided on the supporting surface of the supporting device 110 , and limiting columns 113 are respectively provided at the four corners of the cooking positions 112 . In this way, the cooking container 200 is easily arranged above a certain coil module.

Further, the non-contact switch circuit 111 can be a non-contact electromagnetic switch circuit, such as the non-contact switch shown in CN200710129402.1, or a non-contact infrared sensor switch circuit, such as CN201320710689.8. In this embodiment, as shown in FIG. 4 , the utility model proposes a circuit diagram of a non-contact switch circuit 111 . This non-contact switch circuit 111 comprises single-chip microcomputer MCU, infrared light emitting diode D1, infrared receiving diode D2, first triode Q1, second triode Q2 and relay K1; The model of this single-chip microcomputer MCU is C8051F020, the AIN0 of single-chip microcomputer MCU The .7 pin is reversely connected to the power supply terminal VCC through the infrared receiving diode D2; the P1.2 pin of the MCU is connected to the base of the first triode Q1, and the collector of the first triode Q1 is connected to the first protection resistor R3 is reversely connected to the power supply terminal VCC through the infrared light-emitting diode D1; the emitter of the first triode Q1 is grounded; the emitter of the first triode Q1 and the base of the first triode Q1 are connected with a second Two protective resistors R4; the emitter of the first triode Q1 is connected to the negative pole of the infrared receiving diode D2 through the third protective resistor R1; the P1.3 pin of the single-chip MCU is connected to the base of the second triode Q2, and the third The collector of the second triode Q2 is connected to the power supply terminal VCC through the fourth protection resistor R5; the emitter of the second triode Q2 is grounded after passing through the coil part of the relay K1; the normally open switch of the relay K1 is connected in series with the inductance coil disk 101 . Further, the infrared light-emitting diode D1 and the infrared receiving diode D2 are respectively arranged on the two limit posts 113 of the same cooking position 112; the infrared light-emitting diode D1 is used to emit infrared rays, and the infrared receiving diode D2 is used to receive infrared rays; when the cooking container 200 When placed on the cooking position 112, the infrared receiving diode D2 will not receive infrared rays, so the feedback value received by the AIN0.7 pin of the single-chip MCU will be reduced, and then the P1.3 pin of the single-chip MCU will provide a high Level, so that the coil part of the relay K1 is energized, the normally open switch of the relay K1 is closed, and finally the inductance coil disk 101 is energized.

Further, there are one or more cooking containers 200; when there are multiple cooking containers 200, the multiple cooking containers 200 adopt soft magnetic material layers 201 of different or identical formulations, so that different types of cooking containers can be used. 200 to correspond to limit the upper limit of the cooking temperature of the cooking vessel 200.

The electromagnetic heating device also includes a resonant capacitor 102 connected in parallel with the coil module for constituting an LC resonant circuit. The distance between the supporting surface of the supporting device 110 and the induction coil disk 101 is 6mm～12mm, like this, when the cooking vessel 200 is placed on the support surface, the soft magnetic material layer 201 and the induction coil disk 101 constitute an inductor, and the soft magnetic material Layer 201 becomes the magnetic core of the inductor. The phenomenon that the inductance coil disk 101 makes the soft magnetic material layer 201 heat is based on the principle of eddy current heating. Specifically, when the inductance coil disk 101 is energized, an induced current is generated inside the soft magnetic material layer 201 , thereby emitting resistance heat. During this process, the induction coil plate 101 realizes the non-contact heating of the cooking container 200 . It can be understood that the current flowing through the inductor coil disk 101 is an alternating current.

Because of the magnetic permeability, ferromagnetic properties and electromagnetic induction waveform of the soft magnetic material layer 201, common electromagnetic heating equipment is prone to generate unbearable multiple clutter noises during operation. In order to make electromagnetic heating equipment more suitable The electromagnetic induction performance of the soft magnetic material layer 201 material of this embodiment avoids the occurrence of multiple harmonics and clutter noise. The resonant frequency of the LC resonant circuit of this embodiment is designed above 40KHz; meanwhile, the electromagnetic heating equipment also includes One end of the inductance coil disk 101 is connected to the resonance synchronous detection unit 103 for adjusting the resonant frequency of the LC resonant circuit according to the material of the soft magnetic material layer 201, and the other end of the inductance coil disk 101 is connected to detect the resonance of the LC resonant circuit through a high-speed counter The resonance transfer detection unit 104 for frequency transfer, and the arithmetic processor 107 electrically connected to the resonance synchronous detection unit 103 and the resonance transfer detection unit 104 for calculating the temperature of the soft magnetic material layer 201 according to the resonance frequency transfer. Here, when the temperature of the soft magnetic material layer 201 increases gradually, the relative permeability value will also change from large to small, and the resonant frequency of the LC resonant circuit will also change accordingly.

Further, in this embodiment, the cooking container 200 further includes a cooking application layer 203 and an anti-sticking and anti-rust coating 204 sequentially attached inside the heat-conducting metal layer 202 . Here, the heat-conducting metal layer 202 is usually made of metal copper or metal aluminum. Since most low-temperature cooking containers contain water liquid, which has better heat conduction, the thermal conductivity requirements for the heat-conducting metal layer can be appropriately reduced, so other metal materials can also be used. (For example, cast iron, as long as the nickel-iron alloy can be attached) as the heat-conducting metal layer 202, because the anti-rust performance and hygienic performance of metal copper and metal aluminum are not very good, it can be considered to attach a layer of material to the inside of the cooking container 200 to form The cooking application layer 203 . Generally, the cooking application layer 203 is made of stainless steel or aluminum alloy. Since most low-temperature cooking containers contain water liquid, which conducts heat better, other materials can also be used; the anti-stick and anti-rust coating 204 is made of food hygiene grade Sticky materials are used to achieve hygienic and non-stick properties, such as polytetrafluoroethylene (Polytetrafluoroethylene) or silicon oxide (Silox, Monox) are used to achieve non-stick properties.

Further, the temperature T of the soft magnetic material layer 201 is:

Wherein, f is that the temperature mapping of soft magnetic material layer 201 is the mapping relation of the relative magnetic permeability of soft magnetic material layer 201 material;

l is the length of the inductance coil disk 101;

f ₀ is the resonant frequency of the LC resonant circuit;

N is the number of turns of the inductance coil disk 101;

k is the k coefficient, which depends on the ratio of the radius R of the inductance coil disk 101 to its length l, and is obtained by looking up the k value table; the k value table is common knowledge, and will not be repeated here.

μ ₀ is vacuum magnetic permeability, specifically 4π×10 ^-7 H/m;

C is the capacitance of the resonant capacitor 102;

S is the cross-sectional area of the inductor coil disk 101 .

The specific derivation process of the formula for the temperature T of the soft magnetic material layer 201 is as follows:

In an LC resonant circuit, there are:

Among them, f ₀ is the resonant frequency of the LC resonant circuit;

L is the inductance of the inductor;

C is the capacitance of the resonant capacitor 102 .

In the above formula, since the resonant frequency f ₀ of the LC resonant circuit can be measured by the resonant synchronous detection unit 103; the capacitance C of the resonant capacitor 102 is known, so the inductance L of the inductor can be calculated.

And in inductors, there is empirical formula:

Among them, L is the inductance of the inductor;

μ ₀ is vacuum magnetic permeability, specifically 4π×10 ^-7 H/m;

μ _s is the relative permeability of the soft magnetic material layer 201 material;

N is the number of turns of the inductance coil disk 101;

S is the cross-sectional area of the inductor coil disk 101;

l is the length of the inductance coil disk 101;

k is a k coefficient, which depends on the ratio of the radius R of the inductor coil disk 101 to its length l, which can be obtained by referring to the k value table.

In the empirical formula of inductor inductance, since k, μ ₀ , N, S and l are all known, in this way, μ _s can be obtained after calculating L.

For the material of the soft magnetic material layer 201, when the temperature is below its Curie point, there is a functional relationship f between its relative permeability μ _s and the temperature T, as shown in Figure 3; like this, the material of the soft magnetic material layer 201 The relative permeability μ _s and the temperature T function relationship can be expressed as:

μ _s =f(T); (3)

Through the formulas (1), (2) and (3), the formula for calculating the temperature T of the soft magnetic material layer 201 can be obtained:

Further, in this embodiment, the operation processor 107 may be a SoC integrated circuit (System on a Chip, including an MCU, an operational amplifier, a comparator, a logic circuit, and a driving circuit, etc.).

The electromagnetic heating device also includes an electromagnetic induction heating switching device 108 for providing a driving current to the LC resonant circuit, and is connected to the electromagnetic induction heating switching device 108 and the operation processor 107 respectively, and is used to receive the control signal of the operation processor 107 to control The electromagnetic induction heats the electromagnetic switch driving unit 109 according to the magnitude of the driving current provided by the switching device 108 .

Furthermore, in the electromagnetic induction heating work, the temperature change causes the magnetic permeability to change, the resonant frequency of the LC resonant circuit shifts, the electromagnetic induction effect and the eddy current effect change will affect the electromagnetic waveform change, and sometimes the electromagnetic waveform vicious change will cause Decreased working performance, including decreased efficiency, increased noise, and even damage to electromagnetic induction heating equipment in severe cases. In this embodiment, an electromagnetic waveform detection unit for detecting the electromagnetic induction waveform of the LC resonant circuit and controlling the vicious change of the electromagnetic induction waveform to protect the safety of the LC resonant circuit is connected between the arithmetic processor 107 and the inductance coil disk 101, specifically Specifically, the electromagnetic waveform detection unit includes a resonance current detection unit 105 for detecting the resonance current of the LC resonance circuit and an energy balance detection unit 106 for detecting the output power of the LC resonance circuit. Through the energy balance detection unit 106, when it is detected that the output power of the LC resonant circuit reaches the threshold, an early warning signal is sent; the arithmetic processor 107 is used to turn off the electromagnetic switch drive unit 109 and the electromagnetic induction heating switch device 108 after receiving the early warning signal. Power off the inductance coil disk 101. In addition, by processing the detection data of the resonance transfer detection unit 104, the resonance current detection unit 105 and the energy balance detection unit 106 by the arithmetic processor 107, the effects of controlled heating and constant temperature cooking of the cooking utensil can be achieved.

In another embodiment, with reference to FIG. 2, the cooking container 200 can be processed into a circular plate or other shapes, and it is required to hold heated food. The material of the cooking container 200 should be electromagnetically heated. In this embodiment, In the cooking container 200, the heat-conducting metal layer 202 and the heat-conducting metal layer 202 are combined together. The two materials can be combined by high-pressure heat welding. For example, when brazing or low-temperature pressing is used, care must be taken to achieve good contact, so as not to cause mechanical damage. The causes of impact and thermal expansion and contraction change, thereby affecting the heating or heat conduction effect.

Wherein, the heat-conducting metal layer 202 is used to form the shape of the container and to contact and conduct heat to the food to be heated. The soft magnetic material layer 201 is arranged on the bottom of the heat-conducting metal layer 202, and the thickness of the heat-conducting metal layer 202 is 1 mm to 10 mm; the cooking container 200 also includes a cooking application layer 203 and an anti-sticking and anti-rust coating 204 attached in turn on the inside of the heat-conducting metal layer 202 .

Wherein, the thermally conductive metal layer 202 includes a copper material layer with a thickness of at least 1 mm, and another option is an aluminum material layer with a thickness of at least 2 mm. The heat-conducting metal layer material should not be too thin, and the effect of uniform heat conduction must be ensured, otherwise the alloy material will have uneven magnetic permeability changes due to uneven temperature, and the expected temperature-limiting function of electromagnetic induction heating will seriously fail. In the embodiment of the present invention, the thickness of the copper material layer is at least 1 mm, the thickness of the aluminum material layer is at least 2 mm, and the thickness of the cast iron material layer is at least 3 mm.

Among them, the metal body of the soft magnetic material layer 201 should have ferromagnetic properties, and can be electromagnetically induced to generate eddy current and generate heat. At the same time, the magnetic permeability of this metal body has a relatively stable one-way linear relationship with temperature, so that the electromagnetic induction Heating technology may be more convenient to measure the temperature of the metal body and control it.

The cooking application layer 203 is made of stainless steel or aluminum alloy, and the anti-stick and anti-rust coating 204 is made of food hygiene-grade anti-stick material.

Due to the skin effect of high-frequency alternating current, the range of electromagnetic induction current is only on the surface of the metal body. According to the current electromagnetic induction frequency of our household kitchenware in the range of about 20KHz to 50KHz, the skin effect is about 0.5 In the depth range of mm, since the cost of the soft magnetic material layer 201 alloy is much higher than that of ordinary ferromagnetic materials, it is processed into a metal sheet, and the thickness is determined to be between 0.3mm and 0.6mm, while ensuring the effect cut costs.

Furthermore, in yet another embodiment, referring to FIG. 1 , the heating and temperature control are realized by using the principle of electromagnetic induction heating. In other words, the electromagnetic induction heating system uses the inductance coil to emit electromagnetic waves to heat the metal body, and the change in inductance of the inductance coil can indirectly measure the change in the magnetic permeability of the metal body, thereby indirectly measuring the temperature of the metal body. The temperature can be monitored by detecting the change of magnetic permeability, and the temperature control can be used instead of the power control, which has a better cooking effect;

The electromagnetic heating device includes a support device 110 for supporting the cooking container 200 and a coil module for generating an alternating magnetic field to generate heat in the soft magnetic material layer 201 when energized, and a coil module connected in parallel with the coil module to form an LC resonant circuit. The resonant capacitor 102 is used to adjust the resonant synchronous detection unit 103 of the resonant frequency of the LC resonant circuit according to the material of the soft magnetic material layer 201, and the resonant transfer detection unit 104 that detects the resonant frequency transfer of the LC resonant circuit through a high-speed counter, and is used to adjust the resonant frequency according to the resonant frequency. Transfer to the arithmetic processor 107 for calculating the temperature of the soft magnetic material layer 201 . It also includes an electromagnetic induction heating switch device 108 for providing drive current to the LC resonant circuit, and is connected to the electromagnetic induction heating switch device 108 and the operation processor 107 respectively, and is used to receive a control signal from the operation processor 107 to control electromagnetic induction heating The electromagnetic switch driving unit 109 depends on the magnitude of the driving current provided by the switching device 108 . The electromagnetic wave detection unit that is used to detect the electromagnetic induction waveform of the LC resonant circuit to protect the safety of the LC resonant circuit is connected between the arithmetic processor 107 and the inductance coil disk 101; the electromagnetic wave detection unit includes a resonant current for detecting the LC resonant circuit The resonant current detecting unit 105 and the energy balance detecting unit 106 for detecting the output power of the LC resonant circuit.

Among them, the high-speed counter is used while the electromagnetic induction heating system is working. The MCU chip with a high-speed calculator detects the slight shift of the resonant frequency online, so as to know the slight change of the inductance, and then calculate the change value of the material quality, volume, magnetic permeability and temperature, and determine the material quality and volume. Under certain circumstances, the real-time temperature of the metal sheet can be accurately measured, and its advantages are fast response and high measurement accuracy. It can make the working waveform of the electromagnetic induction heating system soft and perfect from the root, so that the thermal efficiency deterioration caused by the inconsistency of material characteristics will no longer appear, thus fundamentally solving the problems of noise and switch device damage.

The electromagnetic induction heating cooker of the utility model uses the non-contact switch circuit to detect the result of the cooking container to power on and off the inductance coil, thereby realizing the switch control of heating multiple cookers. A variety of cooking containers with multiple layers can limit the upper limit of cooking temperature. The electromagnetic induction heating cooker of the utility model has ingenious design and strong practicability.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present utility model.

Claims (10)

1. a kind of electromagnetic induction heating cooker, including cooking-vessel (200) and electromagnetic heating apparatus；Cooking-vessel (200) wraps Include the heat-conducting metal layer (202) for forming container shapes and the layer of soft magnetic material being attached on heat-conducting metal layer (202) (201)；The electromagnetic heating apparatus includes being used for the support meanss (110) and coil module for supporting cooking-vessel (200), also Including it is in parallel with coil module for form LC resonance circuits resonant capacitor (102), for according to layer of soft magnetic material (201) material adjusts the resonance synchronous detection unit (103) of the resonant frequency of LC resonance circuits, for being examined by high-speed counter Survey the resonant transfer detection unit (104) of the resonant frequency transfer of LC resonance circuits and calculated for being shifted according to resonant frequency The arithmetic processor (107) of layer of soft magnetic material (201) temperature, it is characterised in that

Coil module has multiple, and the plurality of coil module is arranged in parallel；The coil module includes being used for producing friendship when being powered Varying magnetic field is so that the inductance coil disk (101) and use of layer of soft magnetic material (201) heating for the cooking-vessel (200) being positioned above Turned on when detecting cooking-vessel (200) and being located above inductance coil disk (101) so that what inductance coil disk (101) was powered Non-contact switch circuit (111)；Non-contact switch circuit (111) is arranged in series with inductance coil disk (101).

2. electromagnetic induction heating cooker according to claim 1, it is characterised in that cooking-vessel (200) has one or more It is individual；When cooking-vessel (200) has multiple, the plurality of cooking-vessel (200) uses the layer of soft magnetic material of similar and different formula (201)。

3. electromagnetic induction heating cooker according to claim 1, it is characterised in that inductance coil disk (101) is arranged on branch Below support arrangement (110)；The distance between supporting surface and inductance coil disk (101) of support meanss (110) are 6mm~12mm.

4. electromagnetic induction heating cooker according to claim 1, it is characterised in that electromagnetic heating apparatus also includes being used to give LC resonance circuits provide the electromagnetic induction heating switching device (108) of driving current, and are switched respectively with electromagnetic induction heating Device (108) is connected with arithmetic processor (107), controls electromagnetism sense for receiving the control signal of arithmetic processor (107) Answer the electromagnetic switch driver element (109) for the driving current size that heater switch device (108) provided.

5. electromagnetic induction heating cooker according to claim 4, it is characterised in that arithmetic processor (107) and inductor wire It is connected between circle disk (101) for detecting the electromagnetic induction waveform of LC resonance circuits to protect the electromagnetism of LC resonance circuits safety Waveform detecting unit；The resonance current detection that electromagnetic waveforms detection unit includes being used to detect the resonance current of LC resonance circuits is single First (105) and the energy balance detection unit (106) for detecting LC resonance circuit power outputs.

6. electromagnetic induction heating cooker according to claim 1, it is characterised in that layer of soft magnetic material (201), which is arranged on, to be led The bottom of metal layer (202)；The cooking that cooking-vessel (200) also includes being attached to successively on the inside of heat-conducting metal layer (202) should With layer (203) and anti-sticking antirust coat (204).

7. electromagnetic induction heating cooker according to claim 6, it is characterised in that culinary applications layer (203) is using stainless Steel or aluminum alloy materials are made.

8. electromagnetic induction heating cooker according to claim 6, it is characterised in that the heat-conducting metal layer (202) includes At least the copper material layer of 1mm thickness or at least thick cast iron layer of the aluminium material layer of 2mm thickness or at least 3mm.

9. electromagnetic induction heating cooker according to claim 1, it is characterised in that on the supporting surface of support meanss (110) It is provided with and cooks position (112) correspondingly with coil module, inductance coil disk (101) is below culinary art position (112)；Culinary art The corner of position (112) is respectively arranged with limited post (113).

10. electromagnetic induction heating cooker according to claim 9, it is characterised in that non-contact switch circuit (111) wraps Include single-chip microcomputer (MCU), infrarede emitting diode (D1), infrared receiving diode (D2), the first triode (Q1), the second triode And relay (K1) (Q2)；The model C8051F020 of the single-chip microcomputer (MCU), the AIN0.7 pins of single-chip microcomputer (MCU) are reverse Power end (VCC) is connect through infrared receiving diode (D2)；The P1.2 pins of single-chip microcomputer (MCU) connect the first triode (Q1) base Pole, the colelctor electrode of the first triode (Q1) connect electricity through the first protective resistor (R3), then reversely through infrarede emitting diode (D1) Source (VCC)；The grounded emitter of first triode (Q1)；The emitter stage of first triode (Q1) and the first triode (Q1) The second protective resistor (R4) is connected between base stage；The emitter stage of first triode (Q1) connects through the 3rd protective resistor (R1) The negative pole of infrared receiving diode (D2)；The P1.3 pins of single-chip microcomputer (MCU) connect the second triode (Q2) base stage, the two or three pole The colelctor electrode of pipe (Q2) connects power end (VCC) through the 4th protective resistor (R5)；The emitter stage of second triode (Q2) is through relay It is grounded after the coiler part of device (K1)；The normal open switch of relay (K1) is connected with inductance coil disk (101), the pole of infraluminescence two Pipe (D1), infrared receiving diode (D2) are separately positioned on two limited posts (113) of same culinary art position (112).