Heating device and cooking equipment

Abstract

The invention provides a heating device and cooking equipment, and relates to the technical field of cooking equipment. The heating device comprises a coil and a driving circuit. Wherein the direct-current resistance of the coil is greater than the high-frequency impedance, and the sum of the direct-current resistance and the high-frequency impedance is greater than a first resistance value; and the driving circuit is connected with the coil and is used for driving the coil to carry out electromagnetic heating and / or resistance heating.

Description

Technical Field

[0001] This application relates to the technical field of cooking appliances, and more particularly, to a heating device and a cooking appliance. Background Art

[0002] An induction cooker uses the principle of electromagnetic induction to heat cookware, and has advantages such as environmental protection, energy saving, high heating efficiency, and safety.

[0003] In the related art, the coil disk in an induction cooker can only heat cookware made of materials with high magnetic permeability, resulting in poor versatility of the induction cooker and inability to heat cookware made of different materials. Summary of the Invention

[0004] This application aims to solve one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of this application proposes a heating device.

[0006] A second aspect of this application proposes a cooking appliance.

[0007] In view of this, according to a first aspect of this application, a heating device is proposed, including: a coil and a drive circuit. Among them, the DC resistance of the coil is greater than the high-frequency impedance, and the sum of the DC resistance and the high-frequency impedance is greater than a first resistance value; the drive circuit is connected to the coil and is used to drive the coil to perform electromagnetic heating and / or resistive heating.

[0008] In this technical solution, the heating device includes a coil and a drive circuit. The drive circuit is used to drive the coil to perform electromagnetic heating. Electromagnetic heating is the generation of oscillations between the coil and the resonant capacitor in the drive circuit, thereby generating eddy currents to achieve electromagnetic heating of the cookware.

[0009] In this technical solution, the above-mentioned coil for electromagnetic heating is applicable to cookware made of metal materials with high magnetic permeability. For cookware with low magnetic permeability, such as some non-metal cookware, including ceramic cookware, casserole cookware, glass cookware, etc., it is completely unable to be heated, resulting in poor versatility of induction heating appliances. For cookware with low magnetic permeability, electromagnetic heating cannot be performed through coil resonance. Therefore, by adjusting the drive frequency of the drive circuit, the coil heats the cookware by resistive heating.

[0010] In this technical solution, the DC resistance of the coil is the impedance inherent in the coil, and the high-frequency impedance is the impedance generated when high-frequency resonant current passes through the coil. By setting the sum of the DC resistance and the high-frequency impedance to be greater than the first resistance value, and the DC resistance is much greater than the high-frequency impedance, the coil can perform resistive heating on cookware with low magnetic permeability by self-heating when powered on, and can also perform heating through a resonant magnetic field on cookware with high magnetic permeability.

[0011] In the technical solution of the present application, by setting the sum of the DC resistance and the high-frequency impedance of the coil to be greater than the first resistance value, and the DC resistance to be greater than the high-frequency impedance, when the coil is driven by the driving circuit, at least one of electromagnetic heating and resistance heating can be performed. The coil can perform electromagnetic heating and resistance heating on cookware with high magnetic permeability, and can also perform resistance heating on cookware with low magnetic permeability, enabling the heating device to have a good heating effect on different types of cookware and improving the versatility of the heating device.

[0012] In some technical solutions, optionally, the value range of the first resistance value is from 0.5 ohm to 2 ohms, and the value range of the DC resistance is from 0.4 ohm to 1.8 ohms.

[0013] In this technical solution, the value range of the sum of the DC resistance and the high-frequency impedance of the coil is greater than or equal to 0.5 ohm and less than or equal to 2 ohms. Among them, the value range of the DC resistance is from 0.4 ohm to 1.8 ohms.

[0014] It should be noted that to ensure the heating efficiency when the coil performs electromagnetic heating, the high-frequency impedance of the coil needs to be set relatively small. Therefore, by setting the value range of the sum of the DC resistance and the high-frequency impedance to be from 0.5 ohm to 2 ohms, the high-frequency impedance can be made much smaller than the DC resistance.

[0015] In the technical solution of the present application, by setting the value ranges of the DC resistance and the high-frequency impedance of the coil to be from 0.4 ohm to 1.8 ohms, and setting the value range of the sum of the DC resistance and the high-frequency impedance to be from 0.5 ohm to 2 ohms, when the coil performs resistance heating, while ensuring the heating effect, the heat dissipation conditions required by the coil and the cost of the driving circuit are reduced, and the coil also has good heating performance when performing electromagnetic heating.

[0016] In some technical solutions, when the coil performs electromagnetic heating and resistance heating, the output power of the coil is the first power;

[0017] When the coil performs resistance heating, the output power of the coil is the second power;

[0018] Among them, the second power is less than or equal to the first power.

[0019] In this technical solution, the first power is the rated power output by the coil, and the second power is the resistance heating power of the coil when the coil performs resistance heating. Setting the resistance heating power of the coil to be less than the rated power of the coil can ensure that the coil can perform resistance heating and electromagnetic heating on the cookware simultaneously.

[0020] In some technical solutions, the first power and the second power satisfy the following numerical relationship:

[0021] 25% of P1 ≤ P2 ≤ P1;

[0022] Wherein, P1 is the first power and P2 is the second power.

[0023] In this technical solution, by setting the heating power P2 of the coil during resistive heating to be less than or equal to P1, when the coil performs resistive heating on cookware with high magnetic permeability, it can simultaneously perform electromagnetic heating on it, causing the cookware and the coil disk to heat up synchronously and improving the heating efficiency.

[0024] In this technical solution, by setting the heating power P2 of the coil during resistive heating to be greater than or equal to 25% of P1, when the coil performs resistive heating on cookware with low magnetic permeability, the coil has a relatively high heating power, improving the heating efficiency when the coil performs resistive heating on cookware with low magnetic permeability alone.

[0025] In the technical solution of this application, by setting the second power P2 to be less than or equal to the first power P1 and greater than or equal to 25% of P1, when the coil performs resistive heating on cookware with high magnetic permeability, it can simultaneously perform electromagnetic heating on it, causing the cookware and the coil disk to heat up synchronously, and when the coil performs resistive heating on cookware with low magnetic permeability, the coil has a relatively high heating power, improving the heating effect of the coil on different types of cookware.

[0026] In some technical solutions, optionally, the drive circuit includes:

[0027] A power supply component, connected to the coil, for supplying power to the coil;

[0028] A resonance component, connected between the power supply component and the coil;

[0029] A control component, connected to the power supply component and the resonance component, for controlling the coil to perform electromagnetic heating and / or resistive heating through the resonance component.

[0030] In this technical solution, the drive circuit can drive the coil to perform resistive heating and can also drive the coil to perform electromagnetic heating. Among them, the power supply component is used to supply power to the coil, and a high-frequency switch is also provided in the power supply component. By controlling the high-frequency switch by the control component to perform high-frequency switching actions, the resonance component can generate oscillations with the coil, so that the coil generates a magnetic field to perform electromagnetic heating on cookware with high magnetic permeability. The control component is connected to the resonance component and the power supply component. The power supply component can supply power to the control component, and the control component can control the high-frequency switching actions of the high-frequency switch in the power supply component.

[0031] Specifically, the resonant component includes a resonant capacitor, and the control component includes an inverter switch. The inverter switch performs high-frequency switching operations, causing oscillations to occur between the coil and the resonant capacitor, and enabling eddy currents to be generated within a metal cookware with high magnetic permeability, thereby achieving heating of the cookware.

[0032] In the technical solution of this application, by providing a power supply component, a resonant component, and a control component in the drive circuit, the power supply component provides electrical energy to the control component and the coil. The resonant component can generate oscillations with the coil, causing the coil to generate a magnetic field for electromagnetic heating of the cookware. The control component can also adjust the resonant frequency of the coil, thereby controlling the heating power of the coil for electromagnetic heating and resistance heating.

[0033] In some technical solutions, the resonant component includes: a resonant capacitor, with the first end of the resonant capacitor connected to the power supply component and the second end of the resonant capacitor connected to the coil.

[0034] In this technical solution, the resonant component further includes a resonant capacitor, which is connected between the power supply component and the coil. The electrical energy output by the power supply component is transmitted to the coil through the resonant capacitor. The control component can control the high-frequency switch in the power supply component to perform high-frequency switching operations, causing oscillations to occur between the coil and the resonant capacitor.

[0035] Specifically, the resonant capacitor is connected between the high-frequency switch of the power supply component and the coil.

[0036] In the technical solution of this application, by providing a resonant capacitor in the resonant component and arranging the resonant capacitor between the power supply component and the coil, the control component can perform high-frequency switching operations by controlling the power supply circuit, enabling oscillations to occur between the coil and the resonant capacitor, thereby realizing the function of the coil for electromagnetic heating.

[0037] In some technical solutions, the resonant component further includes: a first switch, which is connected between the resonant capacitor and the coil, and the control end of the first switch is connected to the control component.

[0038] In this technical solution, a first switch is also provided in the resonant component. The first switch is connected between the resonant capacitor and the coil, and the first switch can control the on-off state between the resonant capacitor and the coil.

[0039] Specifically, during the process of the heating device performing electromagnetic heating and resistance heating through the coil, the control component controls the first switch to conduct, enabling current to be transmitted through the resonant capacitor to the coil to form an AC loop. At this time, oscillations occur between the coil and the resonant capacitor, thereby forming a magnetic field to heat a metal cookware with high magnetic permeability, and at the same time, the coil itself generates heat to heat the cookware.

[0040] When the cookware heated by the heating device is a metal cookware with high magnetic permeability, the coil can generate eddy current on the cookware through resonance with the resonance capacitor. The eddy current acts with the resistance of the cookware itself, causing the cookware to generate heat by itself. And because the coil has a high DC resistance, it can also generate heat itself, realizing the synchronous heating of the cookware and the coil.

[0041] Specifically, during the process of resistance heating by the heating device through the coil, the control component controls the first switch to disconnect, so that the alternating current transmitted by the power supply component can be transmitted to the coil without passing through the resonance capacitor. At this time, due to the internal resistance of the coil, heat is generated relying on the internal resistance of the coil, achieving the effect of resistance heating.

[0042] In the technical solution of the present application, by arranging a first switch between the resonance capacitor and the coil in the resonance component, and controlling the first switch to disconnect, the coil can be heated by resistance alone.

[0043] In some technical solutions, optionally, the resonance component further includes:

[0044] An absorption module, the first end of the absorption module is connected to the power supply component, the second end of the absorption module is connected to the first switch, and the first switch is used to switch the on-off state between the coil, the absorption module and the resonance capacitor.

[0045] In this technical solution, the first switch is a single-pole double-throw switch. The first switch includes two static contacts. The first static contact is connected to the resonance capacitor, the second static contact is connected to the absorption module, and the moving contact is connected to the coil. By controlling the connection relationship between the moving contact and the first static contact and the second static contact in the first switch, it is possible to adjust whether to connect the resonance capacitor or the absorption module to the coil.

[0046] Specifically, during the process of electromagnetic heating and resistance heating by the heating device through the coil, the control component controls the first static contact and the moving contact of the first switch to conduct, and the second static contact and the moving contact to disconnect, so that the current passes through the resonance capacitor and is transmitted to the coil to form an AC loop. At this time, oscillation occurs between the coil and the resonance capacitor, thereby forming a magnetic field to heat the metal cookware with high magnetic permeability, and at the same time the coil itself generates heat to heat the cookware.

[0047] Specifically, during the process of resistance heating and resistance heating by the heating device through the coil, the control component controls the first static contact and the moving contact of the first switch to disconnect, and the second static contact and the moving contact to conduct, so that the current passes through the absorption module and is transmitted to the coil to form an AC loop. At this time, the coil itself generates heat to heat the cookware. By setting the absorption module, redundant electric energy can be absorbed, avoiding damage to the resonance capacitor caused by the impact of redundant electric energy on the resonance capacitor when the coil is heated by resistance.

[0048] It should be noted that the absorption module is an electrical component capable of absorbing electric energy, such as: inductance elements, capacitance elements, and resistance elements.

[0049] In the technical solution of the present application, by arranging a resonant capacitor, an absorption module, and a first switching element in the resonant assembly, the first switching element can switch the coil to be connected to the resonant capacitor or the absorption module, improving the stability of the coil during resistance heating and avoiding damage to the resonant capacitor when the coil is heated by resistance alone.

[0050] In some technical solutions, the control assembly includes: a controller, a first power supply, and a zero-crossing detection module; the first power supply is connected between the controller and the power supply assembly for supplying power to the controller; the zero-crossing detection module is connected to the controller for detecting the zero-crossing point of the voltage output by the power supply assembly.

[0051] In this technical solution, the controller is used to control the power supply assembly, thereby controlling the resonant frequency of the coil. The first power supply is a low-voltage power supply, which can convert the high-voltage signal in the power supply circuit into a low-voltage signal to supply power to the controller. The zero-crossing detection module is used to detect the zero-crossing point of the voltage in the power supply circuit and control the switching state of the high-frequency switching element in the power supply circuit according to the zero-crossing point of the voltage, reducing the noise during coil resonance.

[0052] In some technical solutions, the power supply assembly includes: a second power supply, a filtering module, a rectifying module, and a second switching element.

[0053] Among them, the first end of the filtering module is connected to the output end of the second power supply, the second end of the filtering module is connected to the control assembly, the first end of the rectifying module is connected to the second end of the filtering module, the second switching element is connected between the power supply assembly and the resonant assembly, and the control end of the second switching element is connected to the control assembly.

[0054] In this technical solution, the power supply assembly includes a second power supply, and the second power supply is an AC power supply. The filtering module is connected to the second power supply and can filter the alternating current output by the second power supply. The filtered alternating current is transmitted to the control assembly for supplying power to the control assembly. The rectifying module is connected between the filtering module and the second switching element to rectify the alternating current signal transmitted to the second switching element to form a direct current signal. The second switching element is a high-frequency inverter switching element, and the second switching element can convert the rectified direct current into a high-frequency alternating current signal and transmit it to the resonant assembly and the coil.

[0055] In the technical solution of the present application, by arranging a second power supply, a filtering module, a rectifying module, and a second switching element in the power supply assembly, the power supply assembly can stably supply power to the coil, the resonant assembly, and the control assembly, improving the stability of the operation of the heating device.

[0056] According to a second aspect of the present application, a cooking device is provided, including: the heating device in any of the above technical solutions, and thus having the beneficial technical effects of the heating device in any of the above technical solutions, which will not be elaborated herein.

[0057] In some technical solutions, optionally, the cooking device further includes a support plate, and the coil is disposed on the support plate to form a coil disk.

[0058] In some technical solutions, optionally, the cooking device further includes a heat dissipation component, and the coil disk is dissipated heat through the heat dissipation component.

[0059] The additional aspects and advantages of the present application will become apparent in the following description section, or be learned through the practice of the present application. Description of the Drawings

[0060] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0061] Figure 1 One of the circuit diagrams of the heating device provided in some embodiments of the present application is shown;

[0062] Figure 2 Another circuit diagram of the heating device provided in some embodiments of the present application is shown;

[0063] Figure 3 Still another circuit diagram of the heating device provided in some embodiments of the present application is shown;

[0064] Figure 4 The waveform diagram of the coil resonance current value provided in some embodiments of the present application is shown;

[0065] Figure 5 The waveform diagrams of the input voltage signal, zero-crossing detection signal, and power drive signal provided in some embodiments of the present application are shown;

[0066] Figure 6 The structural schematic diagram of the cooking device provided in some embodiments of the present application is shown.

[0067] Figures 1 to 6 The reference numerals of are as follows:

[0068] 100 Heating device, 110 Coil, 120 Drive circuit, 122 Power supply component, 1222 Second power supply, 1224 Filter module, 1226 Rectification module, 1228 Second switch, 124 Resonance component, 1242 Resonance capacitor, 1244 First switch, 1246 Absorption module, 126 Control component, 1262 Controller, 1264 First power supply, 1266 Zero-crossing detection module, 200 Cookware, 600 Cooking device. Detailed implementation manners

[0069] In order to more clearly understand the above objects, features, and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the features in this embodiment and the embodiments can be combined with each other.

[0070] In the following description, many specific details are set forth in order to fully understand the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0071] Next, refer to Figures 1 to 6 to describe a heating device and a cooking appliance according to some embodiments of the present application.

[0072] In one embodiment according to the present application, as Figure 1 , Figure 2 and Figure 3 shown, a heating device 100 is proposed, including: a coil 110 and a driving circuit 120. Among them, the DC resistance of the coil 110 is greater than the high-frequency impedance, and the sum of the DC resistance and the high-frequency impedance is greater than a first resistance value; the driving circuit 120 is connected to the coil 110 and is used to drive the coil 110 to perform electromagnetic heating and / or resistance heating.

[0073] In this embodiment, the heating device 100 includes a coil 110 and a driving circuit 120. The driving circuit 120 is used to drive the coil 110 to perform electromagnetic heating. The electromagnetic heating is that an oscillation is generated between the coil 110 and the resonant capacitor 1242 in the driving circuit 120, thereby generating an eddy current to achieve electromagnetic heating of the cookware 200.

[0074] In this embodiment, the above-mentioned electromagnetic heating of the coil 110 can be applied to cookware 200 made of a metal material with high magnetic permeability. For cookware 200 with low magnetic permeability, such as some non-metal cookware, including ceramic cookware, casserole, glass cookware, etc., it cannot be heated at all, resulting in poor versatility of induction heating appliances. For cookware 200 with low magnetic permeability, electromagnetic heating cannot be performed through the resonance of the coil 110. Therefore, by adjusting the driving frequency of the driving circuit 120, the coil 110 heats the cookware 200 by means of resistance heating.

[0075] In this embodiment, the DC resistance of the coil 110 is the impedance inherent to the coil 110 itself, and the high-frequency impedance is the impedance generated when a high-frequency resonant current passes through the coil 110. By setting the sum of the DC resistance and the high-frequency impedance to be greater than the first resistance value and the DC resistance to be much greater than the high-frequency impedance, when the coil 110 is energized, it can perform resistance heating on the cookware 200 with a relatively low magnetic permeability by heating itself through the coil 110, and can also heat the cookware 200 with a relatively high magnetic permeability through a resonant magnetic field.

[0076] Exemplarily, when the heating device 100 heats a metal cookware with a high magnetic permeability, the driving circuit 120 drives the coil 110 in a high-frequency resonance manner, causing the coil 110 to generate a magnetic field to heat the cookware 200. At the same time, the coil 110 can also generate heat due to the influence of the DC internal resistance, that is, both the coil 110 and the cookware 200 generate heat simultaneously.

[0077] Exemplarily, when the heating device 100 heats a non-metal cookware with a low magnetic permeability, the driving circuit 120 drives the coil 110 in a high-frequency resonance or high-frequency chopping manner. The coil 110 can generate heat due to the influence of the DC internal resistance and heat the cookware 200.

[0078] It should be noted that the smaller the DC resistance of the coil 110, the larger the current required for resistance heating at the same power. And an excessive current requires the selection of high-specification semiconductor devices for the switching components in the driving circuit 120, resulting in an increase in cost. Therefore, in order to achieve higher heating efficiency for resistance heating and lower cost of the driving circuit 120, a coil 110 with a larger DC resistance is selected.

[0079] Exemplarily, the coil 110 can be an alloy coil, that is, a coil 110 prepared from an alloy material.

[0080] Exemplarily, the coil 110 can be an infrared heating coil, that is, a coil 110 wound with infrared heating materials such as carbon fiber.

[0081] In the embodiment of the present application, by setting the sum of the DC resistance and the high-frequency impedance of the coil 110 to be greater than the first resistance value and the DC resistance to be greater than the high-frequency impedance, when the coil 110 is driven by the driving circuit 120, it can perform at least one of electromagnetic heating and resistance heating, enabling the coil 110 to perform both electromagnetic heating and resistance heating on the cookware 200 with a high magnetic permeability, and also being able to perform resistance heating on the cookware 200 with a low magnetic permeability, so that the heating device 100 can have a good heating effect on different types of cookware 200, improving the versatility of the heating device 100.

[0082] In some embodiments, optionally, the value range of the first resistance value is from 0.5 ohm to 2 ohms, and the value range of the DC resistance is from 0.4 ohm to 1.8 ohms.

[0083] In this embodiment, the sum of the DC resistance and the high-frequency impedance of the coil 110 ranges from greater than or equal to 0.5 ohm to less than or equal to 2 ohms. Among them, the DC resistance ranges from 0.4 ohm to 1.8 ohms.

[0084] The effective current value when the coil 110 performs resistance heating can be calculated by the following relational expression (1):

[0085]

[0086] Wherein, R1 is the DC resistance, P1 is the rated power of the coil, that is, the first power, and I is the effective current value

[0087] As Figure 4 shown, exemplarily, the DC resistance R1 is 1.6 ohms, the rated power P1 of the coil is 2000W. Through the above formula, I2 can be calculated to be 35.35A. Then, the rated power P1 is 2000W. Since the maximum value of the resonant current of the coil 110 is 96A, it can be seen that the maximum value of the current of the coil 110 is about 3 times the effective current value. For another example: the DC resistance R1 is 1 ohm, the rated power P1 is 2000W, then the effective current value I2 when the coil 110 performs resistance heating is 44.72 ohms, and the maximum value of the current of the coil 110 is about 134.16A. It can be seen that the smaller the DC resistance of the coil 110, the larger the maximum current value of the coil 110. The larger the current value of the coil 110, the higher the cost of the drive circuit 120, and the higher the required heat dissipation conditions. Therefore, selecting a coil 110 with a higher DC resistance can reduce the heat dissipation conditions required by the coil 110 and the cost of the drive circuit 120 while ensuring the heating effect.

[0088] Exemplarily, the DC resistance of the coil 110 ranges from 1 ohm to 1.6 ohms.

[0089] It should be noted that to ensure the heating efficiency when the coil 110 performs electromagnetic heating, the high-frequency impedance of the coil 110 needs to be set to be small. Therefore, by setting the sum of the DC resistance and the high-frequency impedance to range from 0.5 ohm to 2 ohms, the high-frequency impedance can be made much smaller than the DC resistance.

[0090] In the embodiment of the present application, by setting the value ranges of the DC resistance and the high-frequency impedance of the coil 110 to be from 0.4 ohm to 1.8 ohms, and setting the value range of the sum of the DC resistance and the high-frequency impedance to be from 0.5 ohm to 2 ohms, while ensuring the heating effect when the coil 110 performs resistance heating, the heat dissipation conditions required by the coil 110 and the cost of the drive circuit 120 are reduced, and good heating performance is also achieved when the coil 110 performs electromagnetic heating.

[0091] In some embodiments, when the coil 110 performs electromagnetic heating and resistive heating, the output power of the coil 110 is the first power;

[0092] When the coil 110 performs resistive heating, the output power of the coil 110 is the second power;

[0093] Wherein, the second power is less than or equal to the first power.

[0094] In this embodiment, the first power is the rated power output by the coil 110, and the second power is the resistive heating power of the coil 110 when the coil 110 performs resistive heating. Setting the resistive heating power of the coil 110 to be less than the rated power of the coil can ensure that the coil 110 can simultaneously perform resistive heating and electromagnetic heating on the cookware 200.

[0095] Exemplarily, when performing electromagnetic heating and resistive heating on a high-permeability metal cookware, if the rated power output by the heating device 100 is P1, the ratio of the heating power of the cookware 200 to the heating power of the coil disk is as follows:

[0096] P3:P2 = RP:R0×k; (2)

[0097] Wherein, P3 is the heating power of the cookware 200 under electromagnetic heating, P2 is the heating power of the coil under resistive heating, that is, the second power, RP is the internal resistance of the cookware 200, R0 is the sum of the DC resistance and the high-frequency impedance of the coil 110, and k is a constant, and the value range of k is 0.8 to 1.2.

[0098] In some embodiments, the first power and the second power satisfy the following numerical relationship:

[0099] 25%P1 ≤ P2 ≤ P1; (3)

[0100] Wherein, P1 is the first power and P2 is the second power.

[0101] In this embodiment, setting the heating power P2 of the coil 110 during resistive heating to be less than or equal to P1 enables the coil 110 to perform electromagnetic heating on the high-permeability cookware 200 synchronously while performing resistive heating, causing the cookware 200 and the coil disk to heat up synchronously and improving the heating efficiency.

[0102] In this embodiment, setting the heating power P2 of the coil 110 during resistive heating to be greater than or equal to 25%P1 enables the coil 110 to have a higher heating power when performing resistive heating on the low-permeability cookware 200, improving the heating efficiency when the coil 110 performs resistive heating on the low-permeability cookware 200 alone.

[0103] Exemplarily, if the rated power of the coil is 2000W, the heating power of the coil 110 during resistance heating ranges from 500W to 2000W, and specifically, it can be selected as 1000W.

[0104] In the embodiment of the present application, by setting the second power P2 to be less than or equal to the first power P1 and greater than or equal to 25%P1, when the coil 110 performs resistance heating on the high-permeability cookware 200, it can synchronously perform electromagnetic heating on it, so that the cookware 200 and the coil disc heat up synchronously, and when the coil 110 performs resistance heating on the low-permeability cookware 200, the coil 110 has a relatively high heating power, improving the heating effect of the coil 110 on different types of cookware 200.

[0105] As Figure 1 、 Figure 2 and Figure 3 shown, in some embodiments, optionally, the drive circuit 120 includes:

[0106] A power supply component 122, connected to the coil 110, for supplying power to the coil 110;

[0107] A resonance component 124, connected between the power supply component 122 and the coil 110;

[0108] A control component 126, connected to the power supply component 122 and the resonance component 124, for controlling the coil 110 to perform electromagnetic heating and / or resistance heating through the resonance component 124.

[0109] In this embodiment, the drive circuit 120 can drive the coil 110 to perform resistance heating and can also drive the coil 110 to perform electromagnetic heating. Among them, the power supply component 122 is used to supply power to the coil 110, and a high-frequency switch is also provided in the power supply component 122. By controlling the high-frequency switch by the control component 126 to perform a high-frequency switching action, the resonance component 124 can generate oscillations with the coil 110, so that the coil 110 generates a magnetic field to perform electromagnetic heating on the high-permeability cookware 200. The control component 126 is connected to the resonance component 124 and the power supply component 122. The power supply component 122 can supply power to the control component 126, and the control component 126 can control the high-frequency switching action of the high-frequency switch in the power supply component 122.

[0110] Exemplarily, the power supply component 122 includes an inverter switch, such as an IGBT (Insulated Gate Bipolar Transistor) switch or a MOS (Metal Oxide Semiconductor) switch.

[0111] Specifically, the resonant component 124 includes a resonant capacitor 1242, and the control component 126 includes an inverter switch. The inverter switch performs high-frequency switching operations, causing oscillations to occur between the coil 110 and the resonant capacitor 1242, and enabling eddy currents to be generated within a metal cookware with high magnetic permeability, thereby achieving heating of the cookware 200.

[0112] In the embodiment of the present application, by providing a power supply component 122, a resonant component 124, and a control component 126 in the drive circuit 120, the power supply component 122 supplies electrical energy to the control component 126 and the coil 110. The resonant component 124 can generate oscillations with the coil 110, causing the coil 110 to generate a magnetic field for electromagnetic heating of the cookware 200. The control component 126 can also adjust the resonant frequency of the coil 110, thereby controlling the heating power of the electromagnetic heating and resistance heating of the coil 110.

[0113] As Figure 1 shown, in some embodiments, the resonant component 124 includes: a resonant capacitor 1242, where the first end of the resonant capacitor 1242 is connected to the power supply component 122, and the second end of the resonant capacitor 1242 is connected to the coil 110.

[0114] In this embodiment, the resonant component 124 further includes a resonant capacitor 1242. The resonant capacitor 1242 is connected between the power supply component 122 and the coil 110, and the electrical energy output by the power supply component 122 is transmitted to the coil 110 through the resonant capacitor 1242. The control component 126 can control the high-frequency switch in the power supply component 122 to perform high-frequency switching operations, causing oscillations between the coil 110 and the resonant capacitor 1242.

[0115] Specifically, the resonant capacitor 1242 is connected between the high-frequency switch of the power supply component 122 and the coil 110.

[0116] In the embodiment of the present application, by providing a resonant capacitor 1242 in the resonant component 124 and arranging the resonant capacitor 1242 between the power supply component 122 and the coil 110, the control component 126 can perform high-frequency switching operations by controlling the power supply circuit, enabling oscillations to occur between the coil 110 and the resonant capacitor 1242, thereby realizing the function of electromagnetic heating of the coil 110.

[0117] As Figure 2 shown, in some embodiments, the resonant component 124 further includes: a first switch 1244, the first switch 1244 is connected between the resonant capacitor 1242 and the coil 110, and the control end of the first switch 1244 is connected to the control component 126.

[0118] In this embodiment, a first switch 1244 is further provided in the resonance component 124. The first switch 1244 is connected between the resonance capacitor 1242 and the coil 110, and the first switch 1244 can control the on-off state between the resonance capacitor 1242 and the coil 110.

[0119] Specifically, during the electromagnetic heating and resistance heating processes of the heating device 100 through the coil 110, the control component 126 controls the first switch 1244 to conduct, enabling the current to be transmitted to the coil 110 through the resonance capacitor 1242 to form an AC loop. At this time, oscillations occur between the coil 110 and the resonance capacitor 1242, thereby forming a magnetic field to heat the ferromagnetic metal cookware, and at the same time, the coil 110 itself generates heat to heat the cookware 200.

[0120] When the cookware 200 heated by the heating device 100 is ferromagnetic metal cookware, the coil 110 can generate eddy currents on the cookware 200 through resonance with the resonance capacitor 1242. The eddy currents act on the resistance of the cookware 200 itself, causing the cookware 200 to generate heat by itself. And because the coil 110 has a relatively high DC resistance and can also generate heat by itself, synchronous heating of the cookware 200 and the coil 110 is achieved.

[0121] Specifically, during the resistance heating process of the heating device 100 through the coil 110, the control component 126 controls the first switch 1244 to disconnect, enabling the alternating current transmitted by the power supply component 122 to be transmitted to the coil 110 without passing through the resonance capacitor 1242. At this time, due to the internal resistance of the coil 110, heat is generated relying on the internal resistance of the coil 110, achieving the effect of resistance heating.

[0122] In the embodiment of the present application, by providing the first switch 1244 between the resonance capacitor 1242 and the coil 110 in the resonance component 124, and controlling the first switch 1244 to disconnect, the coil 110 can perform resistance heating alone.

[0123] As Figure 3 shown, in some embodiments, optionally, the resonance component 124 further includes:

[0124] An absorption module 1246. The first end of the absorption module 1246 is connected to the power supply component 122, and the second end of the absorption module 1246 is connected to the first switch 1244. The switch is used to switch the on-off state between the coil 110 and the absorption module 1246 and the resonance capacitor 1242.

[0125] In this embodiment, the first switch 1244 is a single-pole double-throw switch. The first switch 1244 includes two stationary contacts. The first stationary contact is connected to the resonant capacitor 1242, the second stationary contact is connected to the absorption module 1246, and the moving contact is connected to the coil 110. By controlling the connection relationship between the moving contact and the first and second stationary contacts in the first switch 1244, it is possible to adjust the connection of the resonant capacitor 1242 or the absorption module 1246 to the coil 110.

[0126] Specifically, during the electromagnetic heating and resistance heating processes of the heating device 100 through the coil 110, the control component 126 controls the first stationary contact and the moving contact of the first switch 1244 to conduct, and the second stationary contact and the moving contact to disconnect, so that the current passes through the resonant capacitor 1242 and is transmitted to the coil 110 to form an AC circuit. At this time, oscillations occur between the coil 110 and the resonant capacitor 1242, thereby forming a magnetic field to heat the ferromagnetic cookware, and at the same time, the coil 110 itself generates heat to heat the cookware 200.

[0127] Specifically, during the resistance heating and resistance heating processes of the heating device 100 through the coil 110, the control component 126 controls the first stationary contact and the moving contact of the first switch 1244 to disconnect, and the second stationary contact and the moving contact to conduct, so that the current passes through the absorption module 1246 and is transmitted to the coil 110 to form an AC circuit. At this time, the coil 110 itself generates heat to heat the cookware 200. By setting the absorption module 1246, redundant electrical energy can be absorbed, avoiding damage to the resonant capacitor 1242 caused by the impact of redundant electrical energy on the resonant capacitor 1242 during the resistance heating of the coil 110.

[0128] It should be noted that the absorption module 1246 is an electrical component capable of absorbing electrical energy, such as: inductive elements, capacitive elements, resistive elements.

[0129] In the embodiment of the present application, by providing the resonant capacitor 1242, the absorption module 1246, and the first switch 1244 in the resonant component 124, the first switch 1244 can switch the connection of the coil 110 to the resonant capacitor 1242 or the absorption module 1246, improving the stability of the coil 110 during resistance heating and avoiding damage to the resonant capacitor 1242 when the coil 110 is heated by resistance alone.

[0130] Such as Figure 1 、 Figure 2 and Figure 3As shown, in some embodiments, the control component 126 includes: a controller 1262, a first power supply 1264, and a zero-crossing detection module 1266; the first power supply 1264 is connected between the controller 1262 and the power supply component 122 for supplying power to the controller 1262; the zero-crossing detection module 1266 is connected to the controller 1262 for detecting the zero-crossing point of the voltage output by the power supply component 122.

[0131] In this embodiment, the controller 1262 is used to control the power supply component 122, thereby controlling the resonance frequency of the coil 110. The first power supply 1264 is a low-voltage power supply, which can convert the high-voltage signal in the power supply circuit into a low-voltage signal to supply power to the controller 1262. The zero-crossing detection module 1266 is used to detect the zero-crossing point of the voltage in the power supply circuit, and control the switching state of the high-frequency switching device in the power supply circuit according to the zero-crossing point of the voltage, so as to reduce the noise during the resonance of the coil 110.

[0132] As Figure 5 shown, the zero-crossing detection module 1266 detects the zero-crossing point of the input voltage signal to generate a zero-crossing detection signal, and the controller 1262 transmits a power driving signal to the high-frequency switching device in the power supply circuit according to the zero-crossing detection signal to drive the high-frequency switch to turn on and off, so as to reduce the noise generated when the coil 110 performs electromagnetic heating.

[0133] Exemplarily, the controller 1262 is also connected to the first switching device 1244 in the resonance component 124, and the controller 1262 in the control component 126 controls the on-off state of the first switching device 1244 to realize the switching control of electromagnetic heating and / or resistance heating.

[0134] In some embodiments, the power supply component 122 includes: a second power supply 1222, a filtering module 1224, a rectifying module 1226, and a second switching device 1228.

[0135] Among them, the first end of the filtering module 1224 is connected to the output end of the second power supply 1222, the second end of the filtering module 1224 is connected to the control component 126, the first end of the rectifying module 1226 is connected to the second end of the filtering module 1224, the second switching device 1228 is connected between the power supply component 122 and the resonance component 124, and the control end of the second switching device 1228 is connected to the control component 126.

[0136] In this embodiment, the power supply assembly 122 includes a second power supply 1222, and the second power supply 1222 is an AC power supply. The filtering module 1224 is connected to the second power supply 1222 and can filter the alternating current output by the second power supply 1222. The filtered alternating current is transmitted to the control assembly 126 for powering the control assembly 126. The rectifying module 1226 is connected between the filtering module 1224 and the second switching device 1228 to rectify the alternating current signal transmitted to the second switching device 1228 to form a direct current signal. The second switching device 1228 is a high-frequency inverter switching device, and the second switching device 1228 can convert the rectified direct current into a high-frequency alternating current signal and transmit it to the resonant assembly 124 and the coil 110.

[0137] Exemplarily, the second switching device 1228 is an IGBT (Insulated Gate Bipolar Transistor) switching device or a MOS (Metal Oxide Semiconductor) switching device.

[0138] Exemplarily, the rectifying module 1226 can be a rectifier circuit, and the filtering module 1224 can be a capacitor filtering circuit, a capacitor-inductor filtering circuit, or an inductor filtering circuit.

[0139] Exemplarily, the control assembly 126 includes a first power supply 1264. The first power supply 1264 can receive the filtered alternating current signal and convert the alternating current signal into a low-voltage signal to power the controller 1262.

[0140] Exemplarily, the second power supply 1222 can be a mains power supply.

[0141] In the embodiment of the present application, by providing the second power supply 1222, the filtering module 1224, the rectifying module 1226, and the second switching device 1228 in the power supply assembly 122, the power supply assembly 122 can stably supply power to the coil 110, the resonant assembly 124, and the control assembly 126, improving the stability of the operation of the heating device 100.

[0142] According to an embodiment of the present application, as Figure 6 shown, a cooking device 600 is proposed, including: the heating device 100 in any of the above embodiments, and thus has the beneficial technical effects of the heating device 100 in any of the above embodiments, which will not be elaborated here.

[0143] In some embodiments, optionally, it further includes: a cookware 200, which is correspondingly arranged relative to the coil.

[0144] In some embodiments, optionally, the cooking device 600 further includes a support plate, and the coil is arranged on the support plate to form a coil disk.

[0145] In some embodiments, optionally, the cooking device 600 further includes a heat dissipation component for dissipating heat from the coil disk through the heat dissipation component.

[0146] It should be clear that in the claims, the specification and the drawings of this application, the term "a plurality of" means two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and making the description process simpler, rather than indicating or implying that the device or element referred to must have the specific orientation, be constructed and operated in the specific orientation. Therefore, these descriptions should not be construed as limitations on this application; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances of the above data.

[0147] In the claims, the specification and the drawings of this application, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In the claims, the specification and the drawings of this application, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0148] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A heating device, characterized in that, it includes: a coil, the DC resistance of the coil is greater than the high-frequency impedance, and the sum of the DC resistance and the high-frequency impedance is greater than a first resistance value; a driving circuit, connected to the coil, for driving the coil to perform electromagnetic heating and / or resistive heating.

2. The heating device according to claim 1, characterized in that, the value range of the first resistance value is from 0.5 ohm to 2 ohms, and the value range of the DC resistance is from 0.4 ohm to 1.8 ohms.

3. The heating device according to claim 1, characterized in that, when the coil performs the electromagnetic heating and the resistive heating, the output power of the coil is a first power; when the coil performs resistive heating, the output power of the coil is a second power; wherein, the second power is less than or equal to the first power.

4. The heating device according to claim 3, characterized in that, the first power and the second power satisfy the following numerical relationship: 25%P1 ≤ P2 ≤ P1; wherein, P1 is the first power and P2 is the second power.

5. The heating device according to any one of claims 1 to 4, characterized in that, the driving circuit includes: a power supply component, connected to the coil, for supplying power to the coil; a resonance component, connected between the power supply component and the coil; a control component, connected to the power supply component and the resonance component, for controlling the coil to perform electromagnetic heating and / or the resistive heating through the resonance component.

6. The heating device according to claim 5, characterized in that, the resonance component includes: a resonance capacitor, the first end of the resonance capacitor is connected to the power supply component, and the second end of the resonance capacitor is connected to the coil.

7. The heating device according to claim 6, characterized in that, the resonance component further includes: a first switching element, the first switching element is connected between the resonance capacitor and the coil, and the control end of the first switching element is connected to the control component.

8. The heating device according to claim 7, characterized in that, the resonance component further includes: an absorption module, the first end of the absorption module is connected to the power supply component, the second end of the absorption module is connected to the first switching element, and the first switching element is used to switch the on-off state between the coil and the absorption module and the resonance capacitor.

9. The heating device according to claim 5, characterized in that, the control component includes: a controller; a first power supply, connected between the controller and the power supply component, for supplying power to the controller; a zero-crossing detection module, connected to the controller, for detecting the zero-crossing point of the voltage output by the power supply component.

10. The heating device according to claim 5, characterized in that, the power supply component includes: a second power supply; a filtering module, the first end of the filtering module is connected to the output end of the second power supply, and the second end of the filtering module is connected to the control component; A rectification module, the first end of the rectification module is connected to the second end of the filtering module; A second switching device, the second switching device is connected between the power supply assembly and the resonance assembly, and the control end of the second switching device is connected to the control assembly.

11. A cooking device, characterized in that, comprising: The heating device according to any one of claims 1 to 10.

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