Heating device and cooking apparatus

Abstract

The present application provides a heating device and cooking apparatus and relates to the technical field of cooking apparatuses. The heating device comprises a coil and a driving circuit. 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. The driving circuit is connected to the coil and used for driving the coil to perform electromagnetic heating and / or resistance heating. The heating device of the present application can achieve better heating effect for different types of cookware, such that the universality of the heating device is improved.

Description

Heating devices and cooking equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on November 29, 2023, with application number "202311612336.9" and application name "Heating device and cooking equipment", the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of cooking equipment, and in particular to a heating device and a cooking device. Background Art

[0003] Induction cookers use the principle of electromagnetic induction to heat pots, and have the advantages of environmental protection, energy saving, efficient heating and safety.

[0004] In the related art, the coil disk in the induction cooker can only heat the pots and pans made of materials with high magnetic permeability, resulting in the induction cooker having poor versatility and being unable to heat pots and pans made of different materials.

[0005] Application Contents

[0006] This application aims to solve one of the technical problems existing in the prior art or related technologies.

[0007] To this end, a first aspect of the present application provides a heating device.

[0008] A second aspect of the present application provides a cooking device.

[0009] In view of this, according to a first aspect of the present application, a heating device is provided, comprising: a coil and a drive circuit. The coil has a DC resistance greater than a 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 configured to drive the coil to perform electromagnetic heating and / or resistive heating.

[0010] In this technical solution, the heating device includes a coil and a drive circuit. The drive circuit is used to drive the coil for electromagnetic heating. The electromagnetic heating generates oscillations between the coil and the resonant capacitor in the drive circuit, thereby generating eddy currents to achieve electromagnetic heating of the cookware.

[0011] In this technical solution, electromagnetic heating using the coil is suitable for cookware made of metal with high magnetic permeability. However, it is completely ineffective against cookware with lower magnetic permeability, such as non-metallic cookware, including ceramic pots, casseroles, and glass pots, resulting in the induction heating device's limited versatility. Since electromagnetic heating of low-permeability cookware cannot be achieved through coil resonance, the drive circuit's drive frequency is adjusted to heat the cookware through resistive heating.

[0012] In this technical solution, the DC resistance of the coil is the impedance of the coil itself, and the high-frequency impedance is the impedance generated by a high-frequency resonant current flowing 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 being significantly greater than the high-frequency impedance, the coil, when energized, can resistively heat cookware with low magnetic permeability through its own heat, while also heating cookware with high magnetic permeability through the resonant magnetic field.

[0013] In the technical solution of the present application, the sum of the DC resistance and the high-frequency impedance of the coil is set to be greater than the first resistance value, and the DC resistance is greater than the high-frequency impedance. This enables the coil to perform at least one of electromagnetic heating and resistance heating when driven by the driving circuit. 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. This enables the heating device to have a good heating effect on different types of cookware, thereby improving the versatility of the heating device.

[0014] In some technical solutions, optionally, the first resistance value ranges from 0.5 ohms to 2 ohms, and the DC resistance value ranges from 0.4 ohms to 1.8 ohms.

[0015] In this technical solution, the sum of the DC resistance and high-frequency impedance of the coil is in the range of greater than or equal to 0.5 ohms and less than or equal to 2 ohms, wherein the DC resistance is in the range of 0.4 ohms to 1.8 ohms.

[0016] It should be noted that in order to ensure the heating efficiency of the coil during electromagnetic heating, the high-frequency impedance of the coil needs to be set relatively small. Therefore, the value range of the sum of the DC resistance and the high-frequency impedance is set to 0.5 ohms to 2 ohms, which can make the high-frequency impedance much smaller than the DC resistance.

[0017] In the technical solution of the present application, by setting the value range of the DC resistance and high-frequency impedance of the coil to 0.4 ohms to 1.8 ohms, and setting the value range of the sum of the DC resistance and high-frequency impedance to 0.5 ohms to 2 ohms, it is achieved that when the coil is resistively heated, the heating effect is ensured while reducing the heat dissipation conditions required for the coil and the cost of the driving circuit, and the coil also has good heating performance when it is electromagnetically heated.

[0018] In some technical solutions, when the coil performs electromagnetic heating and resistance heating, the output power of the coil is a first power;

[0019] When the coil is subjected to resistance heating, the output power of the coil is a second power;

[0020] The second power is less than or equal to the first power.

[0021] 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 performing resistance heating. Setting the resistance heating power of the coil to be less than the rated power ensures that the coil can simultaneously perform resistance heating and electromagnetic heating on the cookware.

[0022] In some technical solutions, the first power and the second power satisfy the following numerical relationship: 25% P1≤P2≤P1;

[0023] Wherein, P1 is the first power and P2 is the second power.

[0024] In this technical solution, the heating power P2 of the coil during resistance heating is set to be less than or equal to P1, so that the coil can simultaneously perform electromagnetic heating on the cookware with high magnetic permeability when performing resistance heating on it, so that the cookware and the coil disk are heated synchronously, thereby improving the heating efficiency.

[0025] In this technical solution, the heating power P2 of the coil during resistance heating is set to be greater than or equal to 25% of P1, so that the coil has a higher heating power when performing resistance heating on cookware with low magnetic permeability, thereby improving the heating efficiency of the coil when performing resistance heating on cookware with low magnetic permeability alone.

[0026] In the technical solution 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% of P1, the coil can simultaneously perform electromagnetic heating on a cookware with high magnetic permeability when performing resistance heating on the cookware, so that the cookware and the coil disk are heated synchronously, and the coil can have a higher heating power when performing resistance heating on a cookware with low magnetic permeability, thereby improving the heating effect of the coil on different types of cookware.

[0027] In some technical solutions, optionally, the driving circuit includes:

[0028] A power supply component is connected to the coil and is used to supply power to the coil;

[0029] A resonant component connected between the power supply component and the coil;

[0030] The control component is connected to the power supply component and the resonance component, and is used to control the coil to perform electromagnetic heating and / or resistance heating through the resonance component.

[0031] In this technical solution, the drive circuit can drive the coil for both resistive heating and electromagnetic heating. The power supply assembly is used to power the coil and is also equipped with a high-frequency switch. The control assembly controls the high-frequency switch to perform high-frequency switching, causing the resonant assembly to oscillate with the coil, thereby generating a magnetic field to electromagnetically heat the high-permeability cookware. The control assembly is connected to the resonant assembly and the power supply assembly. The power supply assembly can supply power to the control assembly, and the control assembly can control the high-frequency switching of the high-frequency switch in the power supply assembly.

[0032] Specifically, the resonant component includes a resonant capacitor, and the control component includes an inverter switch. The inverter switch generates oscillations between the coil and the resonant capacitor through high-frequency switching action, which can generate eddy currents in metal cookware with high magnetic permeability, thereby heating the cookware.

[0033] In the technical solution of the present application, a power supply component, a resonance component and a control component are arranged in the driving circuit, and the power supply component provides electrical energy to the control component and the coil. The resonance component can generate oscillations with the coil, causing the coil to generate a magnetic field to electromagnetically heat 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.

[0034] In some technical solutions, the resonant component includes: a resonant capacitor, a first end of the resonant capacitor is connected to the power supply component, and a second end of the resonant capacitor is connected to the coil.

[0035] In this technical solution, the resonant component also includes a resonant capacitor connected between the power supply component and the coil. The power supply component transmits electrical energy to the coil via the resonant capacitor. The control component controls the high-frequency switching element in the power supply component to perform high-frequency switching, causing the coil and the resonant capacitor to oscillate.

[0036] Specifically, the resonant capacitor is connected between the high-frequency switch component and the coil of the power supply component.

[0037] In the technical solution of the present application, a resonant capacitor is set in the resonant component and the resonant capacitor is set between the power supply component and the coil, so that the control component can perform high-frequency switching actions by controlling the power supply circuit, and can generate oscillations between the coil and the resonant capacitor, thereby realizing the function of the coil to perform electromagnetic heating.

[0038] In some technical solutions, the resonant component further includes: a first switch element, the first switch element is connected between the resonant capacitor and the coil, and a control end of the first switch element is connected to the control component.

[0039] In this technical solution, a first switch is further provided in the resonant component. The first switch is connected between the resonant capacitor and the coil. The first switch can control the on / off state between the resonant capacitor and the coil.

[0040] Specifically, while the heating device uses the coil for electromagnetic and resistive heating, the control component switches on the first switch, transmitting current through the resonant capacitor to the coil, forming an AC circuit. This generates oscillations between the coil and the resonant capacitor, creating a magnetic field that heats the high-permeability metal cookware. Simultaneously, the coil itself generates heat, which also heats the cookware.

[0041] When the pot heated by the heating device is a metal pot with high magnetic permeability, the coil can generate eddy current in the pot through resonance between the coil and the resonant capacitor. The eddy current acts on the resistance of the pot itself, causing the pot to generate heat. Since the coil has a high DC resistance, it can also generate heat, thereby achieving synchronous heating of the pot and the coil.

[0042] Specifically, during the process of the heating device performing resistance heating through the coil, the control component controls the first switch component to disconnect, so that the alternating current transmitted by the power supply component can be transmitted to the coil without passing through the resonant capacitor. At this time, due to the internal resistance of the coil, heat is generated by relying on the internal resistance of the coil to achieve the effect of resistance heating.

[0043] In the technical solution of the present application, a first switch is provided between the resonant capacitor in the resonant component and the coil, and the first switch is controlled to be disconnected, so that the coil can be subjected to resistance heating alone.

[0044] In some technical solutions, optionally, the resonant component further includes:

[0045] The absorption module has a first end connected to the power supply assembly, a second end 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 resonant capacitor.

[0046] In this technical solution, the first switch element is a single-pole double-throw switch element, which includes two static contacts. The first static contact is connected to the resonant 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 in the first switch element and the first static contact and the second static contact, the resonant capacitor or the absorption module can be adjusted to be connected to the coil.

[0047] Specifically, while the heating device uses the coil for electromagnetic and resistive heating, the control component connects the first static contact of the first switch element to the movable contact and disconnects the second static contact from the movable contact, allowing current to flow through the resonant capacitor to the coil, forming an AC circuit. This creates an oscillation between the coil and the resonant capacitor, generating a magnetic field that heats the high-permeability metal cookware. Simultaneously, the coil itself generates heat, which also heats the cookware.

[0048] Specifically, during the process of resistive heating and resistive heating of the coil by the heating device, the control component disconnects the first static contact of the first switch element from the moving contact and connects the second static contact to the moving contact, causing current to be transmitted to the coil through the absorption module to form an AC circuit. At this point, the coil itself generates heat to heat the cookware. The absorption module absorbs redundant electrical energy, preventing the redundant energy generated during resistive heating of the coil from impacting the resonant capacitor and causing damage to the resonant capacitor.

[0049] It should be noted that the absorption module is an electrical component capable of absorbing electrical energy, such as an inductor element, a capacitor element, or a resistor element.

[0050] In the technical solution of the present application, a resonant capacitor, an absorption module and a first switch are arranged in the resonant component, and the coil can be switched to be connected to the resonant capacitor or the absorption module through the first switch, thereby improving the stability of the coil during resistance heating and avoiding damage to the resonant capacitor when the coil is subjected to resistance heating alone.

[0051] In some technical solutions, the control component 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 component, and is used to power the controller; the zero-crossing detection module is connected to the controller, and is used to detect the zero-crossing point of the voltage output by the power supply component.

[0052] In this technical solution, a controller controls the power supply assembly, thereby controlling the resonant frequency of the coil. The first power supply is a low-voltage power supply that converts the high-voltage signal in the power supply circuit into a low-voltage signal to power the controller. A zero-crossing detection module detects the zero-crossing point of the voltage in the power supply circuit and controls the switching state of the high-frequency switching element in the power supply circuit based on this point, reducing noise during coil resonance.

[0053] In some technical solutions, the power supply assembly includes: a second power supply, a filter module, a rectifier module and a second switch element.

[0054] Among them, the first end of the filter module is connected to the output end of the second power supply, the second end of the filter module is connected to the control component, the first end of the rectifier module is connected to the second end of the filter module, the second switch component is connected between the power supply component and the resonant component, and the control end of the second switch component is connected to the control component.

[0055] In this technical solution, the power supply assembly includes a second power supply, which is an AC power supply. A filtering module is connected to the second power supply and is capable of filtering the AC power output by the second power supply. The filtered AC power is transmitted to the control assembly for powering the control assembly. A rectifier module is connected between the filtering module and the second switch element and rectifies the AC power signal transmitted to the second switch element to form a DC power signal. The second switch element is a high-frequency inverter switch element, which is capable of converting the rectified DC power into a high-frequency AC power signal for transmission to the resonant assembly and coil.

[0056] In the technical solution of the present application, by arranging a second power supply, a filter module, a rectifier module and a second switch component in the power supply component, the power supply component can provide stable power to the coil, the resonant component and the control component, thereby improving the stability of the operation of the heating device.

[0057] According to the second aspect of the present application, a cooking device is proposed, comprising: a 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 on here.

[0058] In some technical solutions, optionally, the cooking device further includes a support plate, and the coil is arranged on the support plate to form a coil plate.

[0059] In some technical solutions, optionally, the cooking device further includes a heat dissipation component, which dissipates heat from the coil disk.

[0060] Additional aspects and advantages of the present application will become apparent in the following description or may be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0062] FIG1 shows one of the circuit diagrams of a heating device provided in some embodiments of the present application;

[0063] FIG2 shows a second circuit diagram of a heating device provided in some embodiments of the present application;

[0064] FIG3 shows a third circuit diagram of a heating device provided in some embodiments of the present application;

[0065] FIG4 shows a waveform diagram of coil resonant current values ​​provided in some embodiments of the present application;

[0066] FIG5 shows waveforms of an input voltage signal, a zero-crossing detection signal, and a power drive signal provided in some embodiments of the present application;

[0067] FIG6 shows a schematic structural diagram of a cooking device provided in some embodiments of the present application.

[0068] The reference numerals in Figures 1 to 6 are as follows:

[0069] 100 heating device, 110 coil, 120 drive circuit, 122 power supply component, 1222 second power supply, 1224 filter module, 1226 rectifier module, 1228 second switch element, 124 resonant component, 1242 resonant capacitor, 1244 first switch element, 1246 absorption module, 126 control component, 1262 controller, 1264 first power supply, 1266 zero-crossing detection module, 200 pots, 600 cooking equipment. DETAILED DESCRIPTION

[0070] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the features of this embodiment and the embodiments can be combined with each other.

[0071] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0072] The following describes a heating device and a cooking apparatus according to some embodiments of the present application with reference to FIG. 1 to FIG. 6 .

[0073] According to one embodiment of the present application, as shown in Figures 1, 2, and 3, a heating device 100 is provided, comprising: a coil 110 and a drive circuit 120. 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 drive circuit 120 is connected to the coil 110 and is configured to drive the coil 110 to perform electromagnetic heating and / or resistive heating.

[0074] In this embodiment, the heating device 100 includes a coil 110 and a drive circuit 120. The drive circuit 120 is used to drive the coil 110 to perform electromagnetic heating. The electromagnetic heating generates oscillations between the coil 110 and the resonant capacitor 1242 in the drive circuit 120, thereby generating eddy currents to achieve electromagnetic heating of the cookware 200.

[0075] In this embodiment, electromagnetic heating by the coil 110 is suitable for cookware 200 made of metal with high magnetic permeability. However, cookware 200 with lower magnetic permeability, such as non-metallic cookware (ceramic pots, casseroles, and glassware), cannot be heated at all, resulting in the induction heating device's limited versatility. Since cookware 200 with low magnetic permeability cannot be electromagnetically heated through coil 110 resonance, the drive frequency of the drive circuit 120 is adjusted to cause the coil 110 to heat the cookware 200 through resistive heating.

[0076] In this embodiment, the DC resistance of the coil 110 is the impedance of the coil 110 itself, and the high-frequency impedance is the impedance generated when a high-frequency resonant current flows 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 being significantly greater than the high-frequency impedance, the coil 110, when energized, can resistively heat the cookware 200 with low magnetic permeability through its own heat, and can also heat the cookware 200 with high magnetic permeability through the resonant magnetic field.

[0077] For example, when the heating device 100 heats a metal cookware with high magnetic permeability, the driving circuit 120 drives the coil 110 in a high-frequency resonance manner, so that the coil 110 generates 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, the coil 110 and the cookware 200 heat up at the same time.

[0078] For example, when the heating device 100 heats a non-metallic cookware with low magnetic permeability, the driving circuit 120 drives the coil 110 by high-frequency resonance or high-frequency chopping. The coil 110 can generate heat due to the DC internal resistance, thereby heating the cookware 200.

[0079] It should be noted that the smaller the DC resistance of the coil 110, the greater the current required for resistive heating at the same power. Excessive current requires the use of high-specification semiconductor devices for the switching elements in the drive circuit 120, resulting in increased costs. Therefore, in order to achieve higher heating efficiency of resistive heating and lower cost of the drive circuit 120, a coil 110 with a larger DC resistance is selected.

[0080] Exemplarily, the coil 110 may be an alloy coil, that is, the coil 110 is made of an alloy material.

[0081] Exemplarily, the coil 110 may be an infrared heating coil, that is, the coil 110 is wound with an infrared heating material such as carbon fiber.

[0082] In the embodiment of the present application, the sum of the DC resistance and the high-frequency impedance of the coil 110 is set to be greater than the first resistance value, and the DC resistance is greater than the high-frequency impedance. This enables the coil 110 to perform at least one of electromagnetic heating and resistance heating when driven by the driving circuit 120. The coil 110 can perform electromagnetic heating and resistance heating on the cookware 200 with high magnetic permeability, and can also perform resistance heating on the cookware 200 with low magnetic permeability. This enables the heating device 100 to have a good heating effect on different types of cookware 200, thereby improving the versatility of the heating device 100.

[0083] In some embodiments, optionally, the first resistance value ranges from 0.5 ohms to 2 ohms, and the DC resistance value ranges from 0.4 ohms to 1.8 ohms.

[0084] In this embodiment, the sum of the DC resistance and the high-frequency impedance of the coil 110 is in the range of greater than or equal to 0.5 ohms and less than or equal to 2 ohms, wherein the DC resistance is in the range of 0.4 ohms to 1.8 ohms.

[0085] The effective current value of the coil 110 during resistance heating can be calculated using the following equation (1):

[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 shown in FIG4 , for example, the DC resistance R1 is 1.6 ohms and the rated power P1 of the coil is 2000 W. Using the above formula, we can calculate I to be 35.35 A, which means the rated power P1 is 2000 W. Since the maximum resonant current of coil 110 is 96 A, the maximum current of coil 110 is approximately three times the effective current. For another example, if the DC resistance R1 is 1 ohm and the rated power P1 is 2000 W, the effective current I of coil 110 during resistive heating is 44.72 ohms, and the maximum current of coil 110 is approximately 134.16 A. As can be seen, the smaller the DC resistance of coil 110, the greater the maximum current of coil 110. The greater the current of coil 110, the higher the cost of drive circuit 120 and the higher the required heat dissipation requirements. Therefore, selecting a coil 110 with a higher DC resistance can ensure the heating effect while reducing the required heat dissipation requirements of coil 110 and the cost of drive circuit 120.

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

[0089] It should be noted that in order to ensure the heating efficiency of the coil 110 during electromagnetic heating, the high-frequency impedance of the coil 110 needs to be set relatively small. Therefore, the value range of the sum of the DC resistance and the high-frequency impedance is set to 0.5 ohms to 2 ohms, which can make the high-frequency impedance much smaller than the DC resistance.

[0090] In the embodiment of the present application, by setting the value range of the DC resistance and high-frequency impedance of the coil 110 to 0.4 ohms to 1.8 ohms, and setting the value range of the sum of the DC resistance and the high-frequency impedance to 0.5 ohms to 2 ohms, it is achieved that when the coil 110 performs resistance heating, the heating effect is ensured while reducing the heat dissipation conditions required for the coil 110 and the cost of the driving circuit 120, and the coil 110 also has good heating performance when performing electromagnetic heating.

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

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

[0093] 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 resistance heating power of the coil 110 when the coil 110 performs resistance heating. Setting the resistance heating power of the coil 110 to be less than the rated power of the coil ensures that the coil 110 can simultaneously perform resistance heating and electromagnetic heating on the cookware 200.

[0095] For example, when electromagnetic heating and resistance heating are performed on a metal cookware with high magnetic permeability, the rated power output by the heating device 100 is P1, and the ratio of the heating power of the cookware 200 to the heating power of the coil disk is as follows: P3:P2=RP:R0×k; (2)

[0096] Among them, P3 is the heating power of the cookware 200 under electromagnetic heating, P2 is the heating power of the coil under resistance heating, that is, the second power, RP is the internal resistance of the cookware 200, R0 is the sum of the DC resistance and high-frequency impedance of the coil 110, k is a constant, and the value range of k is 0.8 to 1.2.

[0097] In some embodiments, the first power and the second power satisfy the following numerical relationship: 25% P1≤P2≤P1; (3)

[0098] Wherein, P1 is the first power and P2 is the second power.

[0099] In this embodiment, the heating power P2 of the coil 110 during resistance heating is set to be less than or equal to P1, so that the coil 110 can simultaneously perform electromagnetic heating on the high-permeability cookware 200 while performing resistance heating on it, so that the cookware 200 and the coil disk are heated synchronously, thereby improving the heating efficiency.

[0100] In this embodiment, the heating power P2 of the coil 110 during resistance heating is set to be greater than or equal to 25% of P1, so that when the coil 110 performs resistance heating on the cookware 200 with low magnetic permeability, the coil 110 has a higher heating power, thereby improving the heating efficiency of the coil 110 when performing resistance heating on the cookware 200 with low magnetic permeability alone.

[0101] For example, the rated power of the coil is 2000W, and the heating power of the coil 110 during resistance heating ranges from 500W to 2000W, and specifically can be 1000W.

[0102] 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% of P1, the coil 110 can simultaneously perform electromagnetic heating on the cookware 200 with high magnetic permeability while performing resistance heating on it, so that the cookware 200 and the coil disk are heated synchronously, and when the coil 110 performs resistance heating on the cookware 200 with low magnetic permeability, the coil 110 has a higher heating power, thereby improving the heating effect of the coil 110 on different types of cookware 200.

[0103] As shown in FIG1 , FIG2 and FIG3 , in some embodiments, optionally, the driving circuit 120 includes:

[0104] a power supply component 122 connected to the coil 110 and configured to supply power to the coil 110;

[0105] The resonant component 124 is connected between the power supply component 122 and the coil 110;

[0106] The control component 126 is connected to the power supply component 122 and the resonance component 124 , and is used to control the coil 110 to perform electromagnetic heating and / or resistance heating through the resonance component 124 .

[0107] In this embodiment, the driving circuit 120 can drive the coil 110 to perform resistive 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. The high-frequency switch is controlled by the control component 126 to perform a high-frequency switching action so that the resonant component 124 can oscillate with the coil 110, thereby causing the coil 110 to generate a magnetic field to electromagnetically heat the high-permeability cookware 200. The control component 126 is connected to the resonant 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.

[0108] Exemplarily, the power supply assembly 122 includes an inverter switch element, such as an IGBT (Insulated Gate Bipolar Transistor) switch element or a MOS (Metal Oxide Semiconductor) switch element.

[0109] Specifically, the resonant component 124 includes a resonant capacitor 1242, and the control component 126 includes an inverter switch. The inverter switch generates oscillations between the coil 110 and the resonant capacitor 1242 through high-frequency switching action, which can generate eddy currents in the metal cookware with high magnetic permeability, thereby heating the cookware 200.

[0110] In an embodiment of the present application, a power supply component 122, a resonance component 124 and a control component 126 are provided in the driving circuit 120, and electric energy is provided to the control component 126 and the coil 110 through the power supply component 122. The resonance component 124 can generate oscillations with the coil 110, so that the coil 110 generates a magnetic field to electromagnetically heat the cookware 200. The control component 126 can also adjust the resonant frequency of the coil 110, thereby controlling the heating power of the coil 110 for electromagnetic heating and resistive heating.

[0111] As shown in FIG. 1 , in some embodiments, the resonant component 124 includes a resonant capacitor 1242 , a first end of the resonant capacitor 1242 is connected to the power supply component 122 , and a second end of the resonant capacitor 1242 is connected to the coil 110 .

[0112] In this embodiment, the resonant component 124 further includes a resonant capacitor 1242, which is connected between the power supply component 122 and the coil 110. The power output by the power supply component 122 is transmitted to the coil 110 via 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, thereby generating oscillation between the coil 110 and the resonant capacitor 1242.

[0113] Specifically, the resonant capacitor 1242 is connected between the high-frequency switch of the power supply component 122 and the coil 110 .

[0114] In an embodiment of the present application, a resonant capacitor 1242 is provided in the resonant component 124, and the resonant capacitor 1242 is provided between the power supply component 122 and the coil 110, so that the control component 126 can perform high-frequency switching actions by controlling the power supply circuit, thereby generating oscillations between the coil 110 and the resonant capacitor 1242, thereby realizing the function of the coil 110 to perform electromagnetic heating.

[0115] As shown in FIG. 2 , in some embodiments, the resonant component 124 further includes a first switch 1244 , which is connected between the resonant capacitor 1242 and the coil 110 , and a control end of the first switch 1244 is connected to the control component 126 .

[0116] In this embodiment, a first switch 1244 is further provided in the resonant component 124 . The first switch 1244 is connected between the resonant capacitor 1242 and the coil 110 . The first switch 1244 can control the on / off state between the resonant capacitor 1242 and the coil 110 .

[0117] Specifically, while heating device 100 performs electromagnetic heating and resistive heating via coil 110, control assembly 126 turns on first switch 1244, transmitting current through resonant capacitor 1242 to coil 110 to form an AC circuit. At this point, oscillations occur between coil 110 and resonant capacitor 1242, creating a magnetic field that heats the high-permeability metal cookware. Simultaneously, coil 110 generates its own heat, heating cookware 200.

[0118] When the pot 200 heated by the heating device 100 is a metal pot with high magnetic permeability, the coil 110 can generate eddy current in the pot 200 through resonance with the resonant capacitor 1242. The eddy current acts on the resistance of the pot 200 itself, causing the pot 200 itself to generate heat. Moreover, since the coil 110 has a high DC resistance, it can also generate heat, thereby achieving synchronous heating of the pot 200 and the coil 110.

[0119] Specifically, during the process of the heating device 100 performing resistance heating through the coil 110, the control component 126 controls the first switch 1244 to disconnect, so that the alternating current transmitted by the power supply component 122 can be transmitted to the coil 110 without passing through the resonant capacitor 1242. At this time, due to the internal resistance of the coil 110, heat is generated by relying on the internal resistance of the coil 110 to achieve the effect of resistance heating.

[0120] In the embodiment of the present application, a first switch 1244 is provided between the resonant capacitor 1242 in the resonant component 124 and the coil 110 , and the first switch 1244 is controlled to be disconnected, so that the coil 110 can be subjected to resistance heating alone.

[0121] As shown in FIG3 , in some embodiments, optionally, the resonant component 124 further includes:

[0122] The absorption module 1246 has a first end connected to the power supply assembly 122 , and a second end 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 resonant capacitor 1242 .

[0123] In this embodiment, the first switch element 1244 is a single-pole double-throw switch element. The first switch element 1244 includes two static contacts. The first static contact is connected to the resonant capacitor 1242, the second static 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 in the first switch element 1244 and the first static contact and the second static contact, it is possible to adjust the resonant capacitor 1242 or the absorption module 1246 to be connected to the coil 110.

[0124] Specifically, while heating device 100 performs electromagnetic heating and resistive heating via coil 110, control assembly 126 controls the first static contact and movable contact of first switch element 1244 to be conductive, while the second static contact and movable contact are disconnected, causing current to be transmitted to coil 110 through resonant capacitor 1242, forming an AC circuit. At this point, oscillations occur between coil 110 and resonant capacitor 1242, creating a magnetic field that heats the high-permeability metal cookware. Simultaneously, coil 110 generates its own heat, heating cookware 200.

[0125] Specifically, during the process of resistive heating and resistive heating by the coil 110, the control component 126 controls the first static contact of the first switch 1244 to disconnect from the movable contact and connect to the second static contact of the movable contact, so that current is transmitted to the coil 110 through the absorption module 1246 to form an AC circuit. At this time, the coil 110 generates heat to heat the cookware 200. The absorption module 1246 can absorb redundant electrical energy, preventing the redundant electrical energy generated during the resistive heating of the coil 110 from impacting the resonant capacitor 1242 and causing damage to the resonant capacitor 1242.

[0126] It should be noted that the absorption module 1246 is an electrical component capable of absorbing electrical energy, such as an inductor, a capacitor, or a resistor.

[0127] In an embodiment of the present application, a resonant capacitor 1242, an absorption module 1246 and a first switch element 1244 are provided in the resonant component 124, and the first switch element 1244 can switch the coil 110 to be connected to the resonant capacitor 1242 or the absorption module 1246, thereby improving the stability of the coil 110 during resistance heating and avoiding damage to the resonant capacitor 1242 when the coil 110 is subjected to resistance heating alone.

[0128] As shown in Figures 1, 2 and 3, 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, and is used to power the controller 1262; the zero-crossing detection module 1266 is connected to the controller 1262, and is used to detect the zero-crossing point of the voltage output by the power supply component 122.

[0129] In this embodiment, the controller 1262 is used to control the power supply assembly 122, thereby controlling the resonant frequency of the coil 110. The first power supply 1264 is a low-voltage power supply that can convert the high-voltage signal in the power supply circuit into a low-voltage signal to power 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 element in the power supply circuit based on the zero-crossing point of the voltage, thereby reducing the noise generated when the coil 110 resonates.

[0130] As shown in FIG5 , the zero-crossing detection module 1266 detects the voltage zero-crossing point in the input voltage signal to generate a zero-crossing detection signal. The controller 1262 transmits a power drive signal to the high-frequency switch in the power supply circuit according to the zero-crossing detection signal to drive the high-frequency switch on and off, thereby reducing the noise generated when the coil 110 is electromagnetically heated.

[0131] Exemplarily, the controller 1262 is also connected to the first switch element 1244 in the resonant component 124, and the on-off state of the first switch element 1244 is controlled by the controller 1262 in the control component 126 to achieve switching control of electromagnetic heating and / or resistance heating.

[0132] In some embodiments, the power supply assembly 122 includes: a second power source 1222 , a filter module 1224 , a rectifier module 1226 , and a second switch 1228 .

[0133] Among them, the first end of the filter module 1224 is connected to the output end of the second power supply 1222, the second end of the filter module 1224 is connected to the control component 126, the first end of the rectifier module 1226 is connected to the second end of the filter module 1224, the second switch component 1228 is connected between the power supply component 122 and the resonance component 124, and the control end of the second switch component 1228 is connected to the control component 126.

[0134] In this embodiment, the power supply component 122 includes a second power supply 1222, which is an AC power supply. A filter module 1224 is connected to the second power supply 1222 and is capable of filtering the AC power output by the second power supply 1222. The filtered AC power is transmitted to the control component 126 for powering the control component 126. The rectifier module 1226 is connected between the filter module 1224 and the second switch element 1228 and rectifies the AC power signal transmitted to the second switch element 1228 to form a DC power signal. The second switch element 1228 is a high-frequency inverter switch element. The second switch element 1228 is capable of converting the rectified DC power into a high-frequency AC power signal and transmitting it to the resonant component 124 and the coil 110.

[0135] Exemplarily, the second switch element 1228 is an IGBT (Insulated Gate Bipolar Transistor) switch element or a MOS (Metal Oxide Semiconductor) switch element.

[0136] Exemplarily, the rectifier module 1226 may be a rectifier circuit, and the filter module 1224 may be a capacitor filter circuit, a capacitor-inductor filter circuit, or an inductor filter circuit.

[0137] Illustratively, the control component 126 includes a first power supply 1264 , which can receive a filtered alternating current signal and convert the alternating current signal into a low-voltage electrical signal to power the controller 1262 .

[0138] Exemplarily, the second power source 1222 may be a mains power source.

[0139] In an embodiment of the present application, by setting a second power supply 1222, a filter module 1224, a rectifier module 1226 and a second switch component 1228 in the power supply component 122, the power supply component 122 can provide stable power supply to the coil 110, the resonance component 124 and the control component 126, thereby improving the stability of the operation of the heating device 100.

[0140] According to one embodiment of the present application, as shown in FIG6 , a cooking device 600 is proposed, comprising: the heating device 100 in any of the above embodiments, and thus having the beneficial technical effects of the heating device 100 in any of the above embodiments, which will not be elaborated herein.

[0141] In some implementations, optionally, the method further includes: a cooker 200 , which is arranged corresponding to the coil.

[0142] In some embodiments, optionally, the cooking device 600 further includes a support plate, and the coil is disposed on the support plate to form a coil plate.

[0143] In some embodiments, optionally, the cooking device 600 further includes a heat dissipation component, through which the coil disk is cooled.

[0144] It should be clarified that in the claims, specification and drawings of this application, the term "plurality" refers to two or more. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the purpose of more conveniently describing this application and making the description process simpler, and is not intended to indicate or imply that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation. Therefore, these descriptions cannot be understood as limitations on this application. The terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or 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 ordinary technicians in this field, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

[0145] In the claims, specification, and drawings of this application, the terms "one embodiment," "some embodiments," "a specific embodiment," and the like mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of this application. In the claims, specification, and drawings of this application, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0146] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A heating device, wherein: include: A coil, wherein a DC resistance of the coil is greater than a high-frequency impedance, and a sum of the DC resistance and the high-frequency impedance is greater than a first resistance value; A driving circuit is connected to the coil and is used to drive the coil to perform electromagnetic heating and / or resistance heating.

2. The heating device according to claim 1, wherein: The first resistance value ranges from 0.5 ohms to 2 ohms, and the DC resistance value ranges from 0.4 ohms to 1.8 ohms.

3. The heating device according to claim 1, wherein: When the coil performs the electromagnetic heating and the resistance heating, the output power of the coil is a first power; When the coil is subjected to resistance heating, the output power of the coil is a second power; The second power is less than or equal to the first power.

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

5. The heating device according to any one of claims 1 to 4, wherein: The driving circuit comprises: A power supply component, connected to the coil and used to supply power to the coil; A resonant component connected between the power supply component and the coil; A control component is connected to the power supply component and the resonance component, and is used to control the coil to perform electromagnetic heating and / or resistance heating through the resonance component.

6. The heating device according to claim 5, wherein: The resonant component comprises: A resonant capacitor, wherein a first end of the resonant capacitor is connected to the power supply component, and a second end of the resonant capacitor is connected to the coil.

7. The heating device according to claim 6, wherein: The resonant component also includes: A first switch element, wherein the first switch element is connected between the resonant capacitor and the coil, The control end of the first switch element is connected to the control component.

8. The heating device according to claim 7, wherein: The resonant component also includes: An absorption module, wherein a first end of the absorption module is connected to the power supply component, and a second end of the absorption module is connected to the first switch component, and the first switch component is used to switch the on-off state between the coil, the absorption module and the resonant capacitor.

9. The heating device according to claim 5, wherein: The control component comprises: 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 is connected to the controller and is used to detect the zero-crossing point of the voltage output by the power supply component.

10. The heating device according to claim 5, wherein: The power supply component comprises: Second power supply; A filter module, wherein a first end of the filter module is connected to an output end of the second power supply, and a second end of the filter module is connected to the control component; A rectifier module, wherein a first end of the rectifier module is connected to a second end of the filter module; A second switch component is connected between the power supply component and the resonance component, and a control end of the second switch component is connected to the control component.

11. A cooking device, wherein: include: A heating device as claimed in any one of claims 1 to 10.

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