CN104373973B - Electromagnetic oven and method and device for controlling power of electromagnetic oven - Google Patents

Abstract

The present invention is applicable to the field of kitchen utensils, and provides an induction cooker and its power control method and device. The method includes: judging whether the cooking utensils leave the hob of the induction cooker under the running state of the induction cooker; , then detect the distance between the hob of the electromagnetic oven and the cooking utensil; adjust the power of the electromagnetic oven according to the detected distance, so that the cooking utensil can obtain a specified amount of heat, wherein the heat obtained by the cooking utensil is The magnetic field of the induction cooker generates heat generated by eddy currents in the cooking vessel. The invention can obtain heat of a specified size when the cooking utensil leaves the hob of the induction cooker, thereby facilitating the operation of shaking and stir-frying by the operator in the air, and improving the convenience of cooking.

Description

An induction cooker and its power control method and device

technical field

The invention belongs to the field of kitchen utensils, and in particular relates to an electromagnetic cooker and a power control method and device thereof.

Background technique

The induction cooker adopts the heating principle of magnetic field induction current (also known as eddy current), that is, high-frequency current is generated through the electronic circuit board, and the 50Hz/60Hz alternating current is converted into DC voltage by the rectifier circuit, and then the DC voltage is converted into a frequency by the control circuit. The high-frequency voltage of 20-40KHz forms the alternating magnetic field of the high-frequency induction cooker through the spiral magnetic induction coil. When the magnetic field lines in the magnetic field pass through the bottom of the ferromagnetic material vessel, an alternating current (ie eddy current) is generated in the vessel. The eddy current makes The iron molecules of the pot move at high speed and irregularly, and the molecules collide and rub against each other to generate heat energy, which makes the utensil heat up and is used to heat and cook food, so as to achieve the purpose of cooking.

In the process of using an induction cooker to heat food, such as when using an induction cooker for cooking, in order to fully and evenly heat the food in the cooking vessel, the vessel, such as a frying pan, is often removed from the surface of the induction cooker, and the frying pan is shaken up and down in the air, thereby Turn the food in the wok.

In traditional induction cooker equipment, in order to adapt to the situation that the heated utensils may need to leave the hob of the induction cooker for a short time, a load detection circuit is installed in the induction cooker, such as a current detection circuit or a pulse detection circuit. When the wok leaves the induction cooker The current and resonant frequency of the induction cooker will be different when the hob is on the hob. By detecting the change of the current or resonant frequency of the induction cooker, the induction cooker will be turned off, or the induction cooker will be turned off after waiting for a predetermined time. It is beneficial to improve the convenience of cooking.

Contents of the invention

The object of the present invention is to provide an induction cooker and its power control method and device to solve the problem of the prior art when the frying pan leaves the hob of the induction cooker, the induction cooker will be turned off, or the induction cooker will be turned off after waiting for a predetermined time, which is not conducive to operation. The shaking and stir-frying operation in the air is not conducive to improving the convenience of cooking.

The present invention is achieved in this way, a method for controlling the power of an electromagnetic oven, said method comprising:

When the induction cooker is running, it is judged whether the cooking utensils leave the hob of the induction cooker;

If the cooking utensil leaves the hob of the induction cooker, detecting the distance between the hob of the induction cooker and the cooking utensil;

The power of the electromagnetic oven is adjusted according to the detected distance, so that the cooking vessel acquires a specified amount of heat, wherein the heat acquired by the cooking vessel is the heat generated by the magnetic field of the electromagnetic oven generating eddy currents in the cooking vessel.

Another object of the present invention is to provide a power control device for an induction cooker, said device comprising:

The state judging unit is used for judging whether the cooking utensils leave the hob of the induction cooker under the running state of the induction cooker;

a distance detection unit, configured to detect the distance between the hob of the induction cooker and the cooking utensil if the cooking utensil leaves the hob of the induction cooker;

A power adjustment unit, configured to adjust the power of the induction cooker according to the detected distance, so that the cooking utensils can obtain heat of a specified size, wherein the heat acquired by the cooking utensils is that the magnetic field of the induction cooker generates eddy currents in the cooking utensils generated heat.

The present invention also provides an induction cooker, which includes a distance measuring device and a power controller, wherein:

The power controller is used to determine whether the cooking utensils leave the hob of the induction cooker when the induction cooker is in motion;

If the cooking utensil leaves the hob of the induction cooker, the distance between the hob of the electromagnetic oven and the cooking utensil is detected by the distance measuring device;

The power controller adjusts the power of the electromagnetic oven according to the detected distance, so that the cooking utensils can obtain heat of a specified size, wherein the heat acquired by the cooking utensils is caused by the eddy current generated by the magnetic field of the electromagnetic oven in the cooking utensils. generated heat.

The present invention judges whether the cooking utensils leave the hob of the induction cooker when the electromagnetic oven is in motion, and if so, detects the height or distance between the cooking utensils and the hob of the electromagnetic oven, and adjusts the cooking utensils according to the distance from the hob of the electromagnetic oven. The power of the induction cooker, that is, the farther the cooking utensils are from the hob of the induction cooker, the more the power of the induction cooker needs to be increased. Make the cooking utensils obtain heat of a specified size, so as to better ensure that the cooking utensils can still maintain heat of a specified size when they leave the hob of the induction cooker, which is beneficial to the operator's shaking and stir-frying operation in the air, and is conducive to Improve cooking convenience

Description of drawings

Fig. 1 is the implementation flowchart of the electromagnetic oven power control method provided by the first embodiment of the present invention;

Fig. 2 is a flow chart of the current detection of the distance between the hob of the electromagnetic oven and the cooking utensils provided by the second embodiment of the present invention;

Fig. 3 is a structural block diagram of current detection of the distance between the hob of the induction cooker and the cooking utensils;

Fig. 4 is a flow chart of realizing the detection of the distance between the hob and the cooking utensils of the induction cooker through frequency modulation provided by the third embodiment of the present invention;

Fig. 5 is a flow chart of realizing the distance between the hob and cooking utensils of the electromagnetic oven detected by laser according to the fourth embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a power control device for an induction cooker according to a fifth embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The electromagnetic cooker power control method described in the embodiment of the present invention is used for when the operator uses the electromagnetic cooker, for example, when cooking, there will be an action of shaking up and down in the air to stir fry, so as to avoid the shutdown or standby state that occurs in the prior art. In this case, further judge the distance between the cooking utensil and the hob of the induction cooker, and adjust the power of the induction cooker accordingly through the distance, so that the amount of heat obtained can still be maintained when the cooking utensil is in the air, improving the flexibility of cooking , more convenient to complete the cooking operation. The method is as follows:

Under the running state of the induction cooker, it is judged whether the cooking vessel leaves the hob of the induction cooker; if the cooking utensil leaves the hob of the induction cooker, the distance between the hob of the electromagnetic oven and the cooking utensil is detected; The power of the electromagnetic oven enables the cooking utensils to obtain heat of a specified size, wherein the heat acquired by the cooking utensils is the heat generated by the magnetic field of the electromagnetic oven generating eddy currents in the cooking utensils. Further specific description will be given below in conjunction with the accompanying drawings.

Embodiment one:

Fig. 1 shows the implementation process of the power control method for an induction cooker provided by the first embodiment of the present invention, which is described in detail as follows:

In step S101, in the operating state of the induction cooker, it is judged whether the cooking utensils leave the hob of the induction cooker.

Specifically, the induction cooker is heated by magnetic field induction eddy current. That is to use high-frequency alternating current to generate a magnetic field when passing through the coil. When the magnetic field lines in the magnetic field pass through the bottom of the iron cooking utensils, the magnetic field lines are cut, thereby generating countless small eddy currents, which make the iron atoms of the iron cooking utensils rotate at high speed and generate Collision and friction generate heat and directly heat the food in the pot. Of course, the induction cooker is only the most commonly used device in the present invention, and other electromagnetic heating devices based on the above heating principles should also be equivalent to the induction cooker described in the present invention.

The cooking utensils can be iron pots, iron basins or other iron cooking utensils. The cooking utensil is a cooking tool matched with the induction cooker. Since it needs to be guaranteed that it can induce eddy current heat generated by the magnetic field of the induction cooker, it needs to be a tool made of iron material.

The method for judging whether the cooking vessel leaves the hob of the induction cooker may include the following two methods:

1. Current detection method: the detection principle is when the induction cooker starts to work; if there is a cooking utensil on the hob of the induction cooker, an eddy current will be generated at the bottom of the cooking utensil, which consumes energy, and the current of the power line of the induction cooker will increase. We judge the magnitude of this current increase, thereby estimating whether there are cooking utensils on the hob of the induction cooker.

2. Pulse detection method: The pulse detection method uses pulse counting technology to judge whether there are cooking utensils on the surface of the induction cooker. The energy output part of the induction cooker (the hob coil) is actually a resonant circuit (the hob coil and the internal capacitor form a resonant circuit). The resonant frequency of this resonant circuit is the oscillation frequency of the induction cooker; It's completely different when cooking utensils. By counting and comparing the number of cycles of this oscillation frequency, it is confirmed whether there is a cooking vessel. The sensitivity of the pulse pot detection is high; it is not affected by the change of the load power and the power supply voltage; the control is precise, stable and reliable.

The magnetic disk of the induction cooker, that is, the surface of the induction cooker for placing the cooking utensils, needs to use a heat-resistant material as the hob of the induction cooker because it is in direct contact with the cooking utensils.

In step S102, if the cooking utensil leaves the hob of the induction cooker, the distance between the hob of the induction cooker and the cooking utensil is detected.

When it is detected that the cooking utensil leaves the hob of the induction cooker by one of the above two methods, or preferably by using the pulse detection method, the distance between the hob of the electromagnetic oven and the cooking utensil is detected.

The method for detecting the distance between the hob of the induction cooker and the cooking vessel includes a frequency modulation signal detection method, a current value detection method, and a laser detection method, which will be described in detail in subsequent embodiments.

In step S103, the power of the electromagnetic oven is adjusted according to the detected distance, so that the cooking utensils can obtain heat of a specified size, wherein the heat acquired by the cooking utensils is caused by the magnetic field of the electromagnetic oven generating eddy currents in the cooking utensils. generated heat.

Specifically, when the cooking utensil leaves the hob of the induction cooker, fewer and fewer lines of magnetic force are cut by the cooking utensil in the magnetic field generated by the induction cooker, so the power of the induction cooker is also less and less.

The present invention detects the distance between the hob of the induction cooker and the cooking utensils, and adjusts the power of the induction cooker accordingly according to the detected distance, such as changing the oscillation frequency of the alternating current in the inner coil of the induction cooker, or through other corresponding methods , so that the induction cooker can generate a larger magnetic field, so that the cooking utensils can obtain a specified amount of heat in the air. The heat of the specified size can be the heat obtained when the cooking utensil leaves the hob of the induction cooker, or it can be larger or smaller than this value, and the strength of the magnetic field of the induction cooker can be flexibly set according to the actual situation. Changes and adjust accordingly.

In addition, in the embodiment of the present invention, when it is detected that the distance of the cooking utensil exceeds a predetermined value, such as exceeding 1 meter, or when the cooking utensil leaves the hob of the induction cooker and is within a specified distance for a certain period of time, it can also be turned off. Induction cooker realizes intelligent control of induction cooker.

In the embodiment of the present invention, when the induction cooker is moving and the cooking utensil leaves the hob of the induction cooker, the distance between the cooking utensil and the hob of the induction cooker is measured, and the power of the induction cooker is adjusted according to the distance, so as to better Ensure that the cooking utensils can still maintain the specified amount of heat when they leave the hob of the induction cooker, which is conducive to the operator's shaking and stir-frying operation in the air, and is conducive to improving the convenience of cooking

Embodiment two:

On the basis of Embodiment 1 of the present invention, it is specifically introduced to measure the distance between the cooking utensil and the hob of the induction cooker by the current detection method, as shown in FIG. 2 , and the details are as follows:

In step S201, a current sensor is installed on the power circuit of the induction cooker to detect the instantaneous current value of the power circuit of the induction cooker.

In step S202, the distance between the cooking utensil and the hob of the induction cooker is determined according to the detected instantaneous current value.

As shown in Figure 3, it is a block diagram of the circuit structure of the current detection method according to the embodiment of the present invention. In the power line of the electromagnetic oven, the input alternating current passes through the rectification circuit to output the direct current voltage, and the inverter circuit generates a high voltage according to the pulse width modulation PWM circuit. The frequency signal generates a magnetic field in the copper coil of the induction cooker.

The present invention detects the change of the current value of the power supply circuit through the current sensor, and feeds back the detected current to the controller. Distance, and control the pulse width modulation circuit to realize the regulation of power.

Since induction cookers generally have different set powers, the corresponding current values are also different for different set powers. In addition, when the cooking utensil leaves the hob of the induction cooker, the current values corresponding to different set powers are also different. Therefore, it is necessary to perform corresponding searches according to different set powers.

Therefore, the step of determining the distance between the cooking utensil and the hob of the induction cooker according to the detected instant current value is specifically:

Acquiring the currently set power value of the induction cooker, where the currently set power value is the power value set by the received power setting instruction;

According to the corresponding relationship between the current value and the distance of the cooking utensils from the hob of the induction cooker among different set power values, the distance of the cooking utensils away from the hob of the induction cooker corresponding to the detected current value is searched.

Specifically, by establishing the corresponding relationship between the detected current value and the distance of the cooking utensil from the hob of the induction cooker under different set powers, different distance values corresponding to the same detected current value can be effectively detected. For example, when the set power is 1000W, the detected current is 4A. According to the corresponding relationship, at this time, the distance between the cooking utensils and the hob of the induction cooker is 5cm, and when the set power is 800W, the detected current is 5cm. The electric current is 4 amperes, and at this time, by looking up the corresponding relationship, it can be known that the cooking utensils are still located on the hob of the induction cooker, and the distance between the cooking utensils and the hob of the induction cooker is 0.

The set power is the working power of the induction cooker input by the user. For example, the power of the induction cooker adjusted by the "+" or "-" button on the control panel of the induction cooker is the set power, which can also be input by the user. The power corresponding to commands such as "hot pot" and "stir-fry".

On the basis of Embodiment 1, the present invention further specifically introduces that the distance between the cooking utensils and the hob of the induction cooker is obtained by means of current detection, and corresponding searches are made for different set powers, and the detection method is simple. And it can effectively improve the detection accuracy.

Embodiment three:

On the basis of Embodiment 1 of the present invention, it is specifically introduced to measure the distance between the cooking utensil and the hob of the induction cooker by the high-frequency signal detection method, as shown in FIG. 4 , and the details are as follows:

In step S401, a frequency modulation signal generator and a frequency modulation signal receiver are provided on the induction cooker, and the frequency modulation signal generator sends a frequency modulation signal.

In step S402, the frequency modulation signal receiver receives the frequency modulation signal reflected by the cooking utensil, and determines the distance from the cooking utensil to the hob of the induction cooker according to the time difference.

Specifically, the FM signal generator may be a linear FM signal generator, and by transmitting a linear FM signal, the frequency of the FM signal received by the FM signal receiver is compared with the frequency of the currently transmitted FM signal to obtain the currently transmitted FM signal The difference between the frequency of the signal and the frequency of the received FM signal.

When the distance between the cooking utensil and the hob of the induction cooker is greater, the frequency difference is greater.

According to the set linear change speed of the frequency modulation signal and the magnitude of the obtained frequency difference, the distance between the cooking utensil and the hob of the induction cooker can be calculated.

In order to improve the measurement accuracy in the embodiments of the present invention, a bandpass filter needs to be set to obtain the reflected FM signal transmitted by the FM signal transmitter, and the intensity of the signal received by the FM signal receiver is small, so the received signal can be The intensities are scaled up for comparison.

On the basis of Embodiment 1, the embodiment of the present invention specifically introduces the method of sending and receiving frequency modulation signals to obtain the distance between the cooking utensil and the hob of the induction cooker, and through band-pass filtering and amplification, the accuracy of distance measurement can be improved. sex.

Embodiment four:

On the basis of Embodiment 1 of the present invention, it is specifically introduced to measure the distance between the cooking utensil and the hob of the electromagnetic oven by laser detection method, as shown in Figure 5, and the details are as follows:

In step S501, the electromagnetic oven is provided with a laser diode and a laser receiver, and the laser diode emits a laser signal to a cooking vessel through a heat-resistant transparent material layer.

Specifically, the direction in which the laser diode emits light is used to point to the direction where the cooking vessel is located, and is generally isolated from the cooking vessel by setting a heat-resistant transparent material layer, and the heat-resistant transparent material layer may be glass ceramics or the like.

In order to improve the flatness of the hob of the electromagnetic oven and the convenience of receiving the laser diode and the laser receiver, a heat-resistant transparent material layer can be arranged in the middle of the hob of the electromagnetic oven, and the laser diode and the laser The receivers are located at the same location.

Of course, it should not be limited to this, and the above setting method is only one of the better setting methods. However, it should be noted that the laser light emitted by the laser diode may cause damage to human eyes. Therefore, when setting the position of the laser diode, it is necessary to keep the direction of the light beam away from the user.

In addition, the laser diode works at a higher temperature, which will increase the threshold current, lower the conversion frequency, and accelerate the aging of the device. Therefore, it is necessary to ensure that the heat-resistant transparent material layer should also have better heat insulation performance.

In step S502, the laser receiver receives the laser signal reflected or dissipated by the cooking vessel through the heat-resistant transparent material layer.

When the light beam emitted by the laser diode is emitted to the cooking vessel, the reflected or scattered laser light is received by the laser receiver through the reflection or scattering of the cooking vessel.

In step S503, the distance between the cooking vessel and the electromagnetic surface is determined according to the emission time and reception time of the laser signal.

By controlling and recording the light-emitting time point of the laser diode, and recording the time point of the laser signal received by the laser receiver, the distance transmitted by the laser signal can be obtained, and thus the distance between the cooking utensil and the hob of the induction cooker can be obtained. distance between.

In the embodiment of the present invention, the height of the cooking utensil from the hob of the induction cooker is obtained by means of laser detection, and the test is relatively simpler, the calculation is faster, and it is more conducive to improving real-time power adjustment.

Embodiment five:

Fig. 6 is a schematic structural diagram of a power control device for an induction cooker provided in a fifth embodiment of the present invention, which is described in detail as follows:

The power control device of the electromagnetic oven described in the present invention comprises:

The state judging unit 601 is used for judging whether the cooking utensils leave the hob of the induction cooker under the operating state of the induction cooker;

a distance detection unit 602, configured to detect the distance between the cooking utensil and the hob of the induction cooker if the cooking utensil leaves the hob of the induction cooker;

The power adjustment unit 603 is configured to adjust the power of the electromagnetic oven according to the detected distance, so that the cooking utensils can obtain heat of a specified size, wherein the heat acquired by the cooking utensils is generated by the magnetic field of the electromagnetic oven in the cooking utensils The heat generated by the vortex.

Specifically, optionally, the distance detection unit includes:

The current value detection subunit is used to set a current sensor on the power circuit of the induction cooker to detect the instant current value of the power circuit of the induction cooker;

The first distance determination subunit is configured to determine the distance between the cooking utensil and the hob of the induction cooker according to the detected instantaneous current value.

Specifically, optionally, the distance detection unit includes:

The frequency modulation signal sending subunit is used to set a frequency modulation signal generator and a frequency modulation signal receiver on the electromagnetic cooker, and the frequency modulation signal generator sends a frequency modulation signal;

The second distance determination subunit is used for the frequency modulation signal receiver to receive the frequency modulation signal reflected by the cooking utensil, and determine the distance from the cooking utensil to the hob of the induction cooker according to the time difference.

Specifically, optionally, the distance detection unit includes:

The laser signal sending sub-unit is used to install a laser diode and a laser receiver on the electromagnetic oven, and the laser diode emits a laser signal through the heat-resistant transparent material layer and emits it to the cooking vessel;

The laser signal receiving subunit is used for the laser receiver to receive the laser signal reflected or dissipated by the cooking vessel through the heat-resistant transparent material layer;

The third distance determination subunit is configured to determine the distance between the cooking vessel and the electromagnetic surface according to the emission time and reception time of the laser signal.

The power control device for the induction cooker described in the embodiment of the present invention corresponds to the power control method for the induction cooker described in Embodiment 1 to Embodiment 4, and will not be repeated here.

In addition, an embodiment of the present invention also provides an induction cooker, which includes a distance measuring device and a power controller, wherein:

The power controller is used to determine whether the cooking utensils leave the hob of the induction cooker when the induction cooker is in motion;

If the cooking utensil leaves the hob of the induction cooker, the distance between the hob of the electromagnetic oven and the cooking utensil is detected by the distance measuring device;

The power controller adjusts the power of the electromagnetic oven according to the detected distance, so that the cooking utensils can obtain heat of a specified size, wherein the heat acquired by the cooking utensils is caused by the eddy current generated by the magnetic field of the electromagnetic oven in the cooking utensils. generated heat.

The power control method of the induction cooker described in the embodiment of the present invention is the same as the power control method of the induction cooker described in Embodiment 1 to Embodiment 4.

In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. a kind of electromagnetic oven power control method is it is characterised in that methods described includes:

Under electromagnetism furnace operating state, judge whether cooking ware leaves the stone or metal plate for standing a stove on as a precaution against fire of electromagnetic oven；

If described cooking ware leaves the stone or metal plate for standing a stove on as a precaution against fire of electromagnetic oven, detect between the stone or metal plate for standing a stove on as a precaution against fire of described electromagnetic oven and cooking ware away from From；

Adjust the power of described electromagnetic oven according to the distance being detected, make described cooking ware obtain the heat specifying size, its In, the heat that described cooking ware obtains produces the generated heat of vortex by the magnetic field of electromagnetic oven in described cooking ware.

2. according to claim 1 method it is characterised in that between the stone or metal plate for standing a stove on as a precaution against fire of the described electromagnetic oven of described detection and cooking ware Distance step particularly as follows:

Current sensor, the instant current value of the power circuit of detection electromagnetic oven are arranged on the power circuit of described electromagnetic oven；

According to the instant current value being detected, determine the distance between stone or metal plate for standing a stove on as a precaution against fire of described cooking ware and described electromagnetic oven.

3. according to claim 2 method it is characterised in that described according to the instant current value being detected, cook described in determination Prepare food vessel and described electromagnetic oven the distance between stone or metal plate for standing a stove on as a precaution against fire step particularly as follows:

Obtain the current performance number setting of electromagnetic oven, the described current performance number setting is set as the power setting instruction receiving Performance number；

According in different setting power values, current value and cooking ware leave the corresponding relation of the distance of stone or metal plate for standing a stove on as a precaution against fire of electromagnetic oven, Search the distance that the detected cooking ware corresponding to current value leaves the stone or metal plate for standing a stove on as a precaution against fire of electromagnetic oven.

4. according to claim 1 method it is characterised in that between the stone or metal plate for standing a stove on as a precaution against fire of the described electromagnetic oven of described detection and cooking ware Distance step particularly as follows:

FM signal generator and FM signal receptor are provided with described electromagnetic oven, described FM signal generator sends FM signal；

The FM signal that described FM signal receptor reception is reflected by cooking ware, determines described cooking ware according to time difference Leave the distance of the stone or metal plate for standing a stove on as a precaution against fire of electromagnetic oven.

5. according to claim 1 method it is characterised in that between the stone or metal plate for standing a stove on as a precaution against fire of the described electromagnetic oven of described detection and cooking ware Distance step particularly as follows:

Described electromagnetic oven is provided with laser diode and laser pickoff, described laser diode sends laser signal through resistance to Hot transparent material layer outgoing is to cooking ware；

Described laser pickoff receives the laser letter of described cooking ware reflection or radiating by described heat resistant transparent material layer Number；

Launch time according to described laser signal and reception time determine the distance of described cooking ware and resistance electromagnetic surface.

6. a kind of electromagnetic oven power control device is it is characterised in that described device includes:

Condition adjudgement unit, for, under electromagnetism furnace operating state, judging whether cooking ware leaves the stone or metal plate for standing a stove on as a precaution against fire of electromagnetic oven；

Apart from detector unit, if leave the stone or metal plate for standing a stove on as a precaution against fire of electromagnetic oven for described cooking ware, detect the stone or metal plate for standing a stove on as a precaution against fire of described electromagnetic oven The distance between with cooking ware；

Power adjustment unit, for adjusting the power of described electromagnetic oven according to the distance being detected, makes described cooking ware obtain The heat of specified size, wherein, the heat that described cooking ware obtains produces in described cooking ware for the magnetic field of electromagnetic oven It is vortexed generated heat.

7. according to claim 6 device it is characterised in that described include apart from detector unit:

Current value detection sub-unit, for current sensor is arranged on the power circuit of described electromagnetic oven, detection electromagnetic oven The instant current value of power circuit；

First apart from determination subelement, for according to the instant current value being detected, determining described cooking ware and described electromagnetism The distance between stone or metal plate for standing a stove on as a precaution against fire of stove.

8. according to claim 6 device it is characterised in that described include apart from detector unit:

FM signal sends subelement, receives for being provided with FM signal generator and FM signal on described electromagnetic oven Device, described FM signal generator sends FM signal；

Second distance determination subelement, receives the FM signal being reflected by cooking ware, root for described FM signal receptor Determine that described cooking ware leaves the distance of the stone or metal plate for standing a stove on as a precaution against fire of electromagnetic oven according to time difference.

9. according to claim 6 device it is characterised in that described include apart from detector unit:

Laser signal sends subelement, for being provided with laser diode and laser pickoff, described laser in described electromagnetic oven Diode sends laser signal and passes through heat resistant transparent material layer outgoing to cooking ware；

Laser signal receiving subelement, receives described cooking pot for described laser pickoff by described heat resistant transparent material layer Ware reflection or the laser signal of radiating；

3rd, apart from determination subelement, determines described cooking pot for the launch time according to described laser signal and reception time Ware and the distance of resistance electromagnetic surface.

10. a kind of electromagnetic oven is it is characterised in that described electromagnetic oven includes distance-measuring device and power controller, wherein:

Described power controller is used under electromagnetic oven kinestate, judges whether cooking ware leaves the stone or metal plate for standing a stove on as a precaution against fire of electromagnetic oven；

The stone or metal plate for standing a stove on as a precaution against fire of described electromagnetic oven if described cooking ware leaves the stone or metal plate for standing a stove on as a precaution against fire of electromagnetic oven, is detected by described distance-measuring device The distance between with described cooking ware；

Described power controller adjusts the power of described electromagnetic oven according to the distance being detected, so that described cooking ware is obtained and specifies The heat of size, wherein, the heat that described cooking ware obtains produces vortex for the magnetic field of electromagnetic oven in described cooking ware The heat being generated.