Electromagnetic and electric heating integrated heating device

Abstract

The application relates to an electromagnetic and electric heating integrated heating device, which comprises a shell, a panel arranged on the shell, an electric heating disc and an electromagnetic heating disc arranged in the shell, a control circuit arranged in the shell and electrically connected with the electric heating disc and the electromagnetic heating disc, a control panel arranged on the shell and connected with the control circuit, and a detector arranged on the panel and connected with the control circuit, the detector is used for detecting the type of a pot placed on the panel, and the electric heating disc is located between the panel and the electromagnetic heating disc. The electromagnetic and electric heating integrated heating device disclosed by the application can automatically select a heating mode according to the type of the pot, and the convenience of use is improved.

Description

Technical Field

[0001] This application relates to the field of electrical technology, and in particular to an integrated electromagnetic and electrothermal heating device. Background Technology

[0002] Induction cookers use electromagnetic induction to heat cookware, while ceramic cookers use heat to heat cookware. Induction cookers are advantageous because of their fast heating speed, but cookware is prone to sticking to the bottom, and the intermittent heating at low heat results in less than ideal heating. Ceramic cookers, on the other hand, heat more evenly than induction cookers.

[0003] Currently, there are products on the market that combine both functions, but they are not ideal in terms of cookware type selection and ease of use. Users need to understand the type of each cookware and choose the heating method accordingly. Summary of the Invention

[0004] This application provides an integrated electromagnetic and electrothermal heating device that can automatically select the heating method according to the type of cookware, thereby improving the convenience of use.

[0005] The above-mentioned objective of this application is achieved through the following technical solution:

[0006] This application provides an integrated electromagnetic and electrothermal heating device, comprising:

[0007] shell;

[0008] The control panel is located on the outer casing;

[0009] Both the electric heating plate and the electromagnetic heating plate are located inside the outer casing, with the electric heating plate situated between the panel and the electromagnetic heating plate.

[0010] The control circuit is located inside the casing and is electrically connected to the electric heating plate and the electromagnetic heating plate.

[0011] The control panel is located on the casing and connected to the control circuitry; and

[0012] A detector, located on the panel and connected to the control circuit, is used to detect the type of cookware placed on the panel.

[0013] The control circuit drives the electromagnetic heating plate to emit low-frequency electromagnetic waves and couples them with high-frequency electromagnetic waves.

[0014] In one possible implementation of this application, a heat insulation layer is provided between the electric heating plate and the electromagnetic heating plate.

[0015] In one possible implementation of this application, the edge of the insulation layer extends toward the panel.

[0016] In one possible implementation of this application, when the detector detects a magnetic cookware, it selects the heating mode according to the power on the control panel: the electromagnetic heating plate is activated when the power is high, and the electric heating plate is activated when the power is low.

[0017] When the detector detects a non-magnetic cookware, the electric heating plate will operate.

[0018] In one possible implementation of this application, a detector and a comparison circuit connected to the detector are also included, the comparison circuit being used to obtain the temperature value obtained by the detector;

[0019] When the temperature value obtained by the comparison circuit is less than the set value, the electric heating plate and the electromagnetic heating plate start simultaneously.

[0020] In one possible implementation of this application, a first selection key is also provided on the control panel, which is used to activate only the electromagnetic heating plate.

[0021] In one possible implementation of this application, the first selection key is reset after power failure.

[0022] In one possible implementation of this application, a second selection key is also provided on the control panel, which is used to activate only the electric heating plate.

[0023] In one possible implementation of this application, the second selection key is reset after power failure. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of an integrated electromagnetic and electrothermal heating device provided in this application.

[0025] Figure 2 This is a schematic block diagram of the connection of a control circuit provided in this application. The arrows in the diagram indicate the direction of signal flow.

[0026] Figure 3 This is a waveform comparison diagram of high-frequency electromagnetic waves and low-frequency electromagnetic waves provided in this application.

[0027] Figure 4 This is a schematic block diagram of another control circuit provided in this application.

[0028] Figure 5 This is a schematic diagram illustrating the working principle of a detector provided in this application.

[0029] Figure 6 This is a schematic diagram illustrating the principle of temperature comparison provided in this application.

[0030] Figure 7 This is a schematic diagram illustrating another principle of temperature comparison provided in this application.

[0031] Figure 8 This is a schematic diagram of a control panel provided in this application.

[0032] In the diagram, 1 is the outer casing, 2 is the panel, 3 is the electric heating plate, 4 is the electromagnetic heating plate, 5 is the control circuit, 6 is the control panel, 7 is the detector, 8 is the heat insulation layer, 9 is the comparison circuit, 61 is the first selection key, 62 is the second selection key, 51 is the first drive circuit, 52 is the second drive circuit, 53 is the controller, 71 is the electromagnetic coil, and 72 is the temperature sensor. Detailed Implementation

[0033] The technical solutions in this application will be further described in detail below with reference to the accompanying drawings.

[0034] Please see Figure 1 and Figure 2 This application discloses an integrated electromagnetic and electrothermal heating device, which consists of a shell 1, a panel 2, an electric heating plate 3, an electromagnetic heating plate 4, a control circuit 5, a control panel 6, and a detector 7. The electric heating plate 3, the electromagnetic heating plate 4, the control circuit 5, and the detector 7 are all installed inside the shell 1. The panel 2 is installed on the top surface of the shell 1, where the top surface is the orientation when the shell 1 is placed on a horizontal plane.

[0035] When using the cookware, it is placed directly on panel 2. In some possible implementations, panel 2 is made of microcrystalline glass.

[0036] The electric heating plate 3 is located between the panel 2 and the electromagnetic heating plate 4, that is, the electric heating plate 3 is located below the panel 2, and the electromagnetic heating plate 4 is located below the electric heating plate 3. When the electric heating plate 3 is working, it converts electrical energy into heat energy, which raises the temperature of the pot placed on the panel 2, thereby achieving heating.

[0037] When the electromagnetic heating plate 4 is working, it uses alternating current to generate a constantly changing alternating magnetic field through the coil. Eddy currents are generated in the conductor of the alternating magnetic field. This is caused by the movement of charge carriers in the conductor driven by the eddy electric field. The Joule effect of the eddy current will increase the temperature of the pot placed on the panel 2, thereby achieving heating.

[0038] The control circuit 5 is electrically connected to the electric heating plate 3 and the electromagnetic heating plate 4, and its function is to drive the electric heating plate 3 and the electromagnetic heating plate 4 to work. In some possible implementations, the control circuit 5 consists of a first drive circuit 51, a second drive circuit 52, and a controller 53, etc., and both the first drive circuit 51 and the second drive circuit 52 are electrically connected to the controller 53. At the same time, the first drive circuit 51 and the second drive circuit 52 are also electrically connected to the electric heating plate 3 and the electromagnetic heating plate 4, respectively. The first drive circuit 51 is used to drive the electric heating plate 3 to work, and the second drive circuit 52 is used to drive the electromagnetic heating plate 4 to work.

[0039] It should be understood that when electromagnetic waves propagate, energy transfer occurs when the radius of the waveband is close to the radius of the object. Specifically, this manifests as follows:

[0040] Please see Figure 3 The lower the frequency, the longer the band, and the less likely molecules and atoms are to gain energy, so they are less likely to lose energy. This is manifested in the stronger diffraction ability. The higher the frequency, the smaller the band, and the closer it is to the radius of molecules and atoms, so it is easier to transfer energy. This is manifested in the stronger penetrating power.

[0041] When the second driving circuit 52 drives the electromagnetic heating plate 4, it emits low-frequency electromagnetic waves (e.g., electromagnetic waves with a frequency of 20K-30K) and simultaneously couples some high-frequency electromagnetic waves (e.g., electromagnetic waves with a frequency of 100K and 1000K). The combination of high-frequency and low-frequency electromagnetic waves heats the pot placed on the panel 2.

[0042] The heating wire on the electric heating plate 3 (reference) Figure 1 The design adopts a flattened shape, which reduces the height of the electric heating plate 3. This reduction in height decreases the distance between the electromagnetic heating plate 4 and the panel 2, helping to reduce electromagnetic wave transmission loss. Furthermore, the electric heating plate 3 has gaps of 1-5mm between adjacent heating wires, allowing low-frequency electromagnetic waves to pass through more easily and with less loss.

[0043] The two structures mentioned above (the flat design with gaps between adjacent heating wires) allow electromagnetic waves to deliver more energy to the cookware on panel 2, accelerating the heating speed of the cookware.

[0044] The control panel 6 is located on the outer casing 1 and connected to the control circuit 5. Its function is to transmit user-issued commands to the control circuit 5. It should be understood that the user needs to express their operating intentions (start, stop, increase power, decrease power, and timer, etc.) to the control circuit 5 through the control panel 6, and then the control circuit 5 will transmit the user's operating intentions to the control circuit 5.

[0045] Detector 7 is mounted on panel 2 and connected to control circuit 5 to detect the type of cookware placed on panel 2. It should be understood that when using electromagnetic heating plate 4, the cookware must be made of iron or stainless steel, as other materials cannot generate eddy currents. Therefore, detector 7 is needed to first detect the type of cookware, and then automatically adjust whether to use electric heating plate 3 or electromagnetic heating plate 4 based on the type of cookware.

[0046] In some possible implementations, the detector 7 consists of two parts: an oscillation circuit and a detection circuit. The oscillation circuit generates a sinusoidal signal through an LC oscillator. When the oscillation circuit approaches a metal object, eddy currents are generated inside the metal, causing the parameters of the oscillation circuit to change. This results in the LC oscillator in the oscillation circuit being unable to maintain its output, and the sinusoidal signal disappearing.

[0047] The detection circuit is responsible for capturing the sinusoidal signal generated by the oscillation circuit. If the sinusoidal signal cannot be detected normally, the detection circuit will send a signal back to the control circuit 5. At this time, the control circuit 5 will select to use the electromagnetic heating plate 4 for heating.

[0048] From the user's perspective, all they need to do is place the cookware on the control panel 2, and then send commands to the control circuit 5 by pressing the buttons on the control panel 6 or touching the touch area on the control panel 6. The control circuit 5 will detect the type of cookware through the detector 7, and then automatically select whether to use the electric heating plate 3 or the electromagnetic heating plate 4.

[0049] This method eliminates the need for users to pay attention to the type of cookware. They can simply place the cookware on panel 2 and issue a command through control panel 6, and the cookware on panel 2 will be heated.

[0050] Please see Figure 1 As a specific embodiment of the electromagnetic-electric heating integrated heating device provided in the application, a heat insulation layer 8 is added between the electric heating plate 3 and the electromagnetic heating plate 4. The heat insulation layer 8 has the following functions:

[0051] 1. By intercepting the heat generated by the electric heating plate 3 during operation and transferring it to the electromagnetic heating plate 4, the service life of the electromagnetic heating plate 4 and its associated circuits and components can be extended.

[0052] 2. By intercepting the heat generated by the electric heating plate 3 during operation from being transferred to the interior of the outer casing 1, the service life of the circuits and components inside the outer casing 1 can be extended;

[0053] 3. The heat generated by the electric heating plate 3 and the heat generated by the cookware when the electromagnetic heating plate 4 is working can be concentrated near the panel 2, thereby improving the utilization rate of heat energy.

[0054] Furthermore, the edge of the heat insulation layer 8 extends towards the panel 2, which increases the coverage area of ​​the heat insulation layer 8 and can create a heat insulation barrier on the bottom and around the electric heating plate 3.

[0055] It should be understood that Chinese cooking methods such as stir-frying are typically done with high heat, while stewing is typically done with low heat. As a specific implementation of the electromagnetic-electric heating device provided in the application, when the detector 7 detects a magnetic cookware, the control circuit 5 will also select the heating mode according to the power on the control panel 6. When the power is high, the electromagnetic heating plate 4 will be activated, and when the power is low, the electric heating plate 3 will be activated.

[0056] Selecting high power means cooking over high heat, requiring the pot to heat up quickly. In this case, the electromagnetic heating plate 4 is used to heat the pot. Selecting low power usually means stewing or simmering, in which case the electric heating plate 3 is used to heat the pot.

[0057] It should be understood that when the electromagnetic heating plate 4 is running at low power, it mostly operates in an intermittent start-up mode. This operating mode will cause the water or soup in the pot to boil intermittently. However, when the electric heating plate 3 is running at low power, it heats continuously. This operating mode will cause the water or soup in the pot to boil continuously. Therefore, in the low power mode, this application selects the electric heating plate 3 heating mode, which is more in line with the user's usage habits.

[0058] Please see Figure 4 As a specific embodiment of the electromagnetic-electric-thermal integrated heating device provided in the application, a comparison circuit 9 connected to the detector 7 and the control circuit 5 is also added. The comparison circuit 9 is used to obtain the temperature value of the detector 7 and then output a judgment value to the control circuit 5.

[0059] It should be understood that some cookware can be identified by detector 7, but the part that can generate eddy currents is small in volume. This will result in the cookware heating slowly when only electromagnetic heating plate 4 is used. Therefore, electric heating plate 3 is needed to supplement it. The two heating plates are activated at the same time so that the temperature of the cookware can rise rapidly.

[0060] For some possible implementations, please refer to Figure 5 The detector 7 includes a miniature electromagnetic coil 71 and a temperature sensor 72. The electromagnetic coil 71 is used to heat a portion of the cookware placed on the panel 2, and the temperature sensor 72 is used to obtain the temperature of the portion of the cookware as described above.

[0061] When the temperature sensor 72 receives a temperature value that is significantly higher than that before the electromagnetic coil 71 is activated, it indicates that the pot placed on the panel 2 can be heated by the electromagnetic heating plate 4.

[0062] Temperature comparisons can take the following two forms:

[0063] For the first option, please refer to [the original text]. Figure 6 Select a time point and obtain the temperature value of temperature sensor 72 at this time point. Then compare this temperature value with the temperature value of electromagnetic coil disk 71 when it is not started, calculate whether the difference exceeds the threshold. If it does not exceed the threshold, the two heating disks start at the same time.

[0064] The second option, please refer to Figure 7 After selecting multiple time points and calculating the temperature rise between adjacent time points, the average of the multiple temperature rises is calculated to obtain the average temperature rise rate. When the average temperature rise rate is less than the set average temperature rise rate, the two heating plates start simultaneously.

[0065] In addition, the temperature sensor 72 has another function: to switch the heating mode of the electromagnetic heating plate 4 to that of the electric heating plate 3.

[0066] It should be understood that the drawback of the electromagnetic heating plate 4 is that the pot only heats up at the bottom, which easily leads to burning. The problem with the electric heating plate 3 is that it has a slow start-up speed. However, after the temperature of the electric heating plate 3 rises, the temperature of the bottom surface and most of the side walls of the pot will also rise.

[0067] In addition to working with the electromagnetic coil 71, the temperature sensor 72 can also be used for switching detection between the electric heating plate 3 and the electromagnetic heating plate 4. For cookware that can be heated using the electromagnetic heating plate 4, the electromagnetic heating plate 4 will be used for initial heating.

[0068] When started in this condition, both the electric heating plate 3 and the electromagnetic heating plate 4 start simultaneously. The electromagnetic heating plate 4 rapidly raises the temperature of the bottom of the pot, while the temperature of the electric heating plate 3 also gradually increases. When the temperature of the electric heating plate 3 reaches the set value (detected by the temperature sensor 72), the electromagnetic heating plate 4 stops working, and the electric heating plate 3 continues to work until the user issues a shutdown command via the control panel 6.

[0069] Please see Figure 8 As a specific implementation of the electromagnetic-electric-thermal integrated heating device provided in the application, a first selection key 61 is added to the control panel 6. The first selection key 61 is used to activate only the electromagnetic heating plate 4. The function of the first selection key 61 is to meet the special usage needs of some users.

[0070] Furthermore, after a power outage, the first selection key 61 resets. This means that upon the next power-on startup, the user needs to press the first selection key 61 again to use the function of activating only the electromagnetic heating plate 4. This design aims to prevent operational confusion when multiple users are present.

[0071] It should be understood that after the electric heating plate 3 is used, it needs to be cooled down by increasing the heat dissipation time. Some users have a poor tolerance for noise, so they can use the first selection key 61 to make only the electromagnetic heating plate 4 work during the entire cooking process, which can shorten the working time of the cooling fan after cooking.

[0072] Please see Figure 8 As a specific implementation of the electromagnetic-electric-thermal integrated heating device provided in the application, a second selection key 62 is added to the control panel 6. The second selection key 62 is used to activate only the electric heating plate 3. The function of the second selection key 62 is to meet the special usage needs of some users.

[0073] Furthermore, after a power outage, the second selection key 62 resets. This means that upon the next power-on startup, the user needs to press the second selection key 62 again to use the function of activating only the heating element 3. This design aims to prevent operational confusion when multiple users are present.

[0074] For example, the electromagnetic heating plate 4 emits electromagnetic radiation during use. For some pregnant users, the added second selection key 62 can solve this problem. Therefore, when only the electric heating plate 3 is used, there will be no electromagnetic radiation.

[0075] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electromagnetic and electric heating integrated heating device, characterized by, include: Outer shell (1); Panel (2) is provided on the outer casing (1); The electric heating plate (3) and the electromagnetic heating plate (4) are both located inside the outer shell (1), with the electric heating plate (3) located between the panel (2) and the electromagnetic heating plate (4); The control circuit (5) is located inside the housing (1) and is electrically connected to the electric heating plate (3) and the electromagnetic heating plate (4); Control panel (6), located on housing (1) and connected to control circuit (5); and The detector (7) is located on the panel (2) and connected to the control circuit (5) for detecting the type of cookware placed on the panel (2); The heating wires on the electric heating plate (3) are flat and there is a gap of 1-5mm between adjacent heating wires; The control circuit (5) is configured to drive the electromagnetic heating plate (4) to simultaneously emit low-frequency electromagnetic waves with a frequency of 20kHz-30kHz and high-frequency electromagnetic waves with coupling frequencies of 100kHz and 1000kHz, so as to reduce the transmission loss of electromagnetic waves when passing through the electric heating plate (3) by combining the low-frequency electromagnetic waves and the high-frequency electromagnetic waves and by utilizing the flat design of the heating wire and the gap.

2. The electromagnetic electrothermal integrated heating device according to claim 1, characterized in that, A heat insulation layer (8) is provided between the electric heating plate (3) and the electromagnetic heating plate (4).

3. The electromagnetic electrothermal integrated heating device according to claim 2, characterized in that, The edge of the insulation layer (8) extends toward the panel (2).

4. The electromagnetic-electric-thermal integrated heating device according to claim 1, characterized in that, When the detector (7) detects the magnetic cookware, it selects the heating mode according to the power on the control panel (6). When the power is high, the electromagnetic heating plate (4) is activated, and when the power is low, the electric heating plate (3) is activated. When the detector (7) detects a non-magnetic cookware, the electric heating plate (3) operates.

5. The electromagnetic-electric-thermal integrated heating device according to claim 4, characterized in that, It also includes a comparison circuit (9) connected to the detector (7), which includes a miniature electromagnetic coil disk (71) and a temperature sensor (72). The comparison circuit (9) is used to obtain the temperature value obtained by the temperature sensor (72) of the detector (7). When the temperature value obtained by the comparison circuit (9) is less than the set value, the electric heating plate (3) and the electromagnetic heating plate (4) start simultaneously.

6. The electromagnetic-electric-thermal integrated heating device according to any one of claims 1 to 5, characterized in that, It also includes a first selection key (61) on the control panel (6), which is used to activate only the electromagnetic heating plate (4).

7. The electromagnetic-electric-thermal integrated heating device according to claim 6, characterized in that, After power failure, the first selection key (61) is reset.

8. The electromagnetic-electric-thermal integrated heating device according to any one of claims 1 to 5, characterized in that, It also includes a second selection key (62) on the control panel (6), which is used to activate only the electric heating plate (3).

9. The electromagnetic-electric-thermal integrated heating device according to claim 8, characterized in that, After power failure, the second selection key (62) is reset.

Images