Heating assembly and cooking equipment

Abstract

The invention provides a heating assembly and cooking equipment, and relates to the technical field of cooking equipment. The heating assembly comprises: a coil panel; the resonant capacitor is electrically connected with the coil panel; the inductor is electrically connected with the coil panel, and the inductor, the coil panel and the resonance capacitor can form a resonance circuit.

Description

Technical Field

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

[0002] In the related art, induction heating appliances such as induction cookers belong to flameless heating, with fast heating speed and high safety. However, induction heating appliances have poor compatibility with the material and shape of cookware. For example, they can achieve good heating power and heating effect for metal cookware with high magnetic permeability, while they cannot heat non-metal cookware with low magnetic permeability.

[0003] To solve the above problems, the related art proposes a hybrid heating method, that is, adding a resistive heating wire on the basis of the original induction coil, and the heating wire generates heat when induction heating is not possible. However, this product requires adding an additional heating wire coil, resulting in a high cost. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present application provides a heating component.

[0006] A second aspect of the present application provides a cooking appliance.

[0007] In view of this, a first aspect of the present application provides a heating component, which includes: a coil disc; a resonant capacitor electrically connected to the coil disc; and an inductor electrically connected to the coil disc, and the inductor, the coil disc, and the resonant capacitor can form a resonant circuit.

[0008] In this technical solution, the heating component includes a coil disc, a resonant capacitor, and an inductor. Exemplarily, the coil disc can be formed by winding a wire. The heating component is specifically used to heat a load, where the load can be a cooking utensil such as a cookware, a baking tray, or a kettle.

[0009] In the related art, for electromagnetic induction heating, its principle is that the control circuit generates a rapidly changing magnetic field in the coil disc through high-frequency power inverter switching devices such as IGBT (Insulated Gate Bipolar Transistor) switching devices or MOS (Metal Oxide Semiconductor) switching devices. At this time, if the load placed on the coil disc is a ferromagnetic load, such as a metal cookware, a large amount of eddy current will be generated on the load, and then Joule heat will be generated in the cookware itself.

[0010] At this time, the coil disk, the resonant capacitor, and the load can be equivalent to a resonant circuit of an inductor and a resistor. After forming a resonant system, a large amount of Joule heat can be generated on the resistor (i.e., the load), realizing the heating function of the load.

[0011] For infrared radiation heating, due to the existence of an equivalent resistance in the coil disk itself, Joule heat will also be generated in the coil disk itself in the resonant system. In electromagnetic heating appliances in related technologies, such as induction cookers, in order to improve the heating effect of the load and at the same time suppress the heating effect of the coil disk itself, Litz wire (a conductor is composed of multiple thinner independent insulated conductors twisted or braided together) is usually used to wind the coil disk, thereby effectively reducing the equivalent resistance of the coil disk itself. For example, the resistance of the coil disk itself is suppressed to less than 0.5 Ω. Therefore, the self-heating of the coil disk of this kind of electromagnetic heating appliance is controlled at a low level and cannot be used as an effective heat source. Therefore, it cannot heat non-ferromagnetic loads and has poor versatility.

[0012] In view of the above problems, the technical solution of this application proposes a heating component. In addition to being able to heat a metal load by electromagnetic induction heating, it can also use the heat generated by the coil disk itself to heat the load. By increasing the equivalent internal resistance of the coil disk and strengthening the structure, when the load of the coil disk is not a ferromagnetic load, it can heat non-ferromagnetic loads such as ceramic cookware, glass cookware, and aluminum cookware by making the coil disk itself generate heat.

[0013] Specifically, the coil disk in the technical solution of this application can be wound by a single-conductor cable, multiple strands of wire, or a conductor strip, so that the equivalent internal resistance of the coil disk is significantly increased. When the heating component is unloaded or heating a non-ferromagnetic load, the resonant system can still have sufficient equivalent inductance and equivalent resistance. At this time, the equivalent resistance is the impedance of the coil disk itself. The resonant resistance can use the coil disk itself as a heat source and generate eddy currents in the coil disk to make the coil disk itself generate heat, and transfer the heat to the load by means of heat radiation or heat conduction to realize the heating of the non-ferromagnetic load.

[0014] Among them, in order to obtain a suitable equivalent resistance, the material, size, etc. of the conductor cable of the coil disk can be selected according to design requirements, such as the maximum heating power of the heating component. As the load is different and the heating power is different, the equivalent internal resistance of the coil disk will also change. When the equivalent resistance of the coil disk is less than the appropriate equivalent resistance, the resonant current in the resonant system will increase significantly, resulting in the resonant current exceeding the limit. The excessive resonant current will increase the stress on high-frequency inverter power switching devices (such as IGBT high-frequency inverter power switching devices) and resonant devices, making the high-frequency power devices in an unfavorable working condition.

[0015] In view of the above problems, the technical solution of the present application adds an inductor and electrically connects the inductor to the coil disk. When the equivalent resistance of the coil disk is less than the appropriate equivalent resistance, the added inductor can suppress the resonant current, effectively preventing the resonant current from increasing rapidly and causing the current to exceed the limit, reducing the stress of the resonant system, and preventing the resonant system from malfunctioning due to overcurrent.

[0016] Among them, the inductor can be set as a conventional independent inductor device or can be part of the coil disk and wound concentrically with the coil disk.

[0017] The technical solution of the present application sets an inductor electrically connected to the coil disk in the heating component. When heating a non-ferromagnetic load through the coil disk, the inductor can suppress the resonant current in the resonant system when the equivalent resistance of the coil disk is insufficient, thereby reducing the stress of the resonant system, enabling the electromagnetic induction system to heat the non-ferromagnetic load by making the coil disk itself generate heat, realizing electromagnetic induction heating of ferromagnetic loads and radiative heating of non-ferromagnetic loads through a single coil disk, without adding additional heating wire coils, and reducing the equipment cost of hybrid heating.

[0018] In addition, the heating component in the above technical solution provided by the present application may also have the following additional technical features:

[0019] In some technical solutions of the present application, optionally, the coil disk is connected in series with the inductor to form an inductive circuit.

[0020] In this technical solution, the inductor is connected in series with the coil disk. Specifically, the first end of the inductor is electrically connected to the first end of the coil disk. When heating a non-ferromagnetic load, the equivalent resistance of the coil disk forms the "load" in the resonant circuit. At this time, an eddy current is formed in the coil disk inside the resonant circuit, generating Joule heat inside the coil disk, thereby realizing the heating of the actual load on the heating component.

[0021] When the equivalent resistance of the coil disk is small, a relatively large resonant current may be generated in the resonant circuit. At this time, this part of the resonant current will enter the inductive circuit and be suppressed by the inductor connected in series with the coil disk in the inductive circuit, controlling the resonant current within a reasonable range and avoiding excessive stress on high-frequency power devices in the resonant system, such as inverter devices and high-frequency inverter power switch devices.

[0022] The technical solution of the present application suppresses the resonant current by connecting an inductor in series on the coil disk, reduces the stress of the resonant system, and can improve the reliability of the heating component.

[0023] In some technical solutions of the present application, optionally, the inductor is connected in series with the inductive circuit.

[0024] In this technical solution, the coil disk, the inductor, and the resonant capacitor form a series resonant circuit. Specifically, in the resonant system, the coil disk can be equivalent to a series-connected inductor and resistor. At this time, the first end of the inductor regarded as such is electrically connected to the first end of the resistor. In the series resonant circuit, it can be equivalent that the first end of the inductor is electrically connected to the first end of the resistor, the second end of the inductor is electrically connected to the inductor, and the second end of the resistor is electrically connected to the resonant capacitor.

[0025] In the technical solution of this application, by forming a series resonant circuit with the coil disk, the inductor, and the resonant capacitor, when the resonant current in the resonant circuit exceeds the limit, the inductor can suppress the excessive resonant current, thereby reducing the system stress and ensuring the reliability of the heating component.

[0026] In some technical solutions of this application, optionally, the inductor is connected in parallel with the inductive circuit.

[0027] In this technical solution, the coil disk and the inductor are connected in series to form an inductive circuit, and the capacitor is connected in parallel with the inductive circuit to form a resonant circuit. Specifically, in the resonant system, the coil disk can be equivalent to a series-connected inductor and resistor. At this time, the first end of the inductor regarded as such is electrically connected to the first end of the resistor. In the parallel resonant circuit, it can be equivalent that the first end of the inductor is electrically connected to the first end of the resistor, the second end of the inductor is electrically connected to the first end of the inductor, the first end of the capacitor is electrically connected to the second end of the inductor, and the second end of the capacitor is electrically connected to the second end of the resistor.

[0028] In the technical solution of this application, by connecting the coil disk and the inductor in series to form an inductive circuit and connecting the inductive circuit and the resonant capacitor in parallel to form a parallel resonant circuit, when the resonant current in the resonant circuit exceeds the limit, the inductor can suppress the excessive resonant current, thereby reducing the system stress and ensuring the reliability of the heating component.

[0029] In some technical solutions of this application, optionally, the heating component further includes: a switching device, connected in parallel with the inductor.

[0030] In this technical solution, a switching device connected in parallel with the inductor is further provided in the heating component. When the switching device is turned off, the inductor is connected in series with the coil disk. At this time, the inductor can limit the resonant current in the resonant system. When the switching device is turned on, the inductor is short-circuited by the switching device. At this time, the inductor no longer limits the resonant current in the resonant system.

[0031] Specifically, when the heating component is working, the control circuit of the heating component detects the load condition and adjusts the resonant parameters of the resonant system according to the load condition, such as the resonant frequency, the switching frequency of the IGBT, the duty cycle of the IGBT, etc.

[0032] When the load is a non-metallic load (non-ferromagnetic load), increasing the coil current makes it easier for the coil to generate heat. At this time, if the equivalent resistance of the coil disk is less than a preset resistance threshold, the control switch device is disconnected, the inductor is connected in series with the coil disk, and the resonant current is reduced through the inductor to reduce the system stress.

[0033] When heating a non-metallic load (non-ferromagnetic load), if the equivalent resistance of the coil disk is greater than the resistance threshold, or when heating a metallic load (ferromagnetic load), the control switch device is closed, the inductor is short-circuited, and at this time the inductor no longer suppresses the resonant current, reducing the overall inductance of the resonant system and increasing the current of the resonant system, so as to obtain a greater power output and improve the heating efficiency.

[0034] The technical solution of this application can select whether to connect the inductor according to different load states by setting the switch device. On the one hand, it can suppress the resonant current when the resonant current exceeds the limit and reduce the system stress. On the other hand, it can increase the power output of the heating component when the resonant current does not exceed the limit and ensure the heating efficiency.

[0035] In some technical solutions of this application, optionally, the heating component is used to heat cookware, and the heating component further includes: a control circuit for detecting the type of the cookware and controlling the closing or opening of the switch device according to the type of the cookware.

[0036] In this technical solution, the heating component includes a control circuit. The control circuit is used to control the high-frequency resonant power switch device in the heating component, such as an IGBT, to work at a switching frequency and duty cycle matching the heating power selected by the user, and is also used to control the switch device connected in parallel with the inductor, so as to select whether to connect the inductor.

[0037] The control circuit is also used to detect the type of the cookware on the current heating component. Exemplarily, the types of cookware include ferromagnetic cookware and non-ferromagnetic cookware.

[0038] In some embodiments, the control circuit can determine the type of the cookware according to the cooking instruction input by the user. For example, a human-machine interaction interface is provided on the cooking device applying the embodiments of this application, and the user can manually input the type of the cookware currently used, or select the type of the cookware currently used from a preset plurality of types of cookware.

[0039] In other embodiments, the control circuit includes a detection circuit. The detection circuit can detect the type of the cookware placed on the current coil disk. Exemplarily, the detection circuit can be a magnetic detection circuit, and the magnetic detection circuit can detect whether the cookware is a ferromagnetic cookware.

[0040] The technical solution of this application can control the closing or opening of the switching device according to the detected type of cookware, which can avoid excessive resonant current, reduce the system stress, and ensure the heating efficiency of the coil at the same time.

[0041] In some technical solutions of this application, optionally, the control circuit is specifically configured to control the switching device to close when the type of cookware is a metal cookware, or to control the switching device to open when the type of cookware is a non-metal cookware.

[0042] In this technical solution, when the detected type of cookware is a ferromagnetic cookware, the switching device is controlled to close, so that the inductor is short-circuited. At this time, the inductor no longer suppresses the resonant current, reduces the overall inductance of the resonant system, increases the current of the resonant system, thereby obtaining a greater power output and improving the heating efficiency.

[0043] When the detected type of cookware is a non-ferromagnetic cookware, the switching device is controlled to open, so that the inductor is connected in series with the coil disk, and the resonant current is reduced through the inductor to reduce the system stress.

[0044] The technical solution of this application determines whether to connect the inductor according to the type of cookware, which can ensure the heating efficiency of electromagnetic induction heating and reduce the system stress when the coil generates heat at the same time.

[0045] In some technical solutions of this application, optionally, the coil disk includes a wire harness, and the heating assembly further includes: a support frame, and the wire harness is wound around the support frame to form the coil disk.

[0046] In this technical solution, the coil disk includes a wire harness. Exemplarily, parameters such as the material, length, and cross-sectional area of the wire harness are associated with the equivalent resistance of the desired coil disk. Since there is no need to pursue a smaller resistance, the use restrictions on the winding material can be reduced, such as the restrictions on resistivity and antioxidant properties, and materials that are cheaper and more conventional than Litz wire can be used to wind the coil disk.

[0047] The wire harness is wound around the support frame to form the above-mentioned coil disk. Among them, the support frame is used to protect, position, and support the coil disk and other working structures of the heating assembly. The coil disk is arranged on the support frame. After the coil disk is powered on, under the action of the resonant circuit, a resonant current and an alternating magnetic field can be generated in the coil disk. At this time, the support frame can prevent interference between the coil disk and other functional components and improve the reliability of the heating assembly.

[0048] In some technical solutions of this application, optionally, the heating assembly further includes: a heat insulation part, and the heat insulation part is arranged on the support frame and is located on the side of the coil disk close to the support frame.

[0049] In this technical solution, since the coil disk provided in the technical solution of the present application can not only generate an alternating magnetic field through resonance, thereby generating eddy current on a ferromagnetic metal cookware to heat the cookware, but also generate heat by using its own impedance, taking the coil itself as a "load", that is, the coil disk itself can heat the cookware by generating heat.

[0050] When the coil disk generates heat by itself, the temperature of the coil disk is relatively high. By adding a heat insulation part, on the one hand, it can prevent the high temperature of the coil disk from damaging other electrical components, and on the other hand, the heat insulation part can reflect the heat at the bottom of the coil disk towards the top direction of the coil disk, that is, the direction where the cookware is placed, so as to achieve the effect of concentrating the heat on the cookware and improving the heating efficiency.

[0051] In some technical solutions of the present application, optionally, the heating assembly further includes: a magnetic member, the magnetic member is arranged on the support frame, and the heat insulation part is located between the coil disk and the magnetic member.

[0052] In this technical solution, the heating assembly further includes a magnetic member, the magnetic member is arranged at the bottom of the coil disk and fixed by the support frame, and the magnetic member is isolated from the coil disk by the heat insulation part. The magnetic member can confine the magnetic field, making the magnetic field concentrated on the load, protecting the electrical components below the support frame, and at the same time improving the heating efficiency.

[0053] The second aspect of the present application provides a cooking device, including the heating assembly provided in any of the above technical solutions. Therefore, this cooking device also includes all the beneficial effects of the heating assembly provided in any of the above technical solutions. To avoid repetition, they will not be elaborated here. Description of the Drawings

[0054] The above and / or additional aspects and advantages of the present application will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0055] Figure 1 Shows the equivalent circuit diagram of the heating assembly of some embodiments of the present application;

[0056] Figure 2 Shows the equivalent schematic diagram of the electromagnetic induction heating system of some embodiments of the present application;

[0057] Figure 3 Shows the equivalent circuit diagram of the heating assembly of some embodiments of the present application;

[0058] Figure 4 Shows the equivalent circuit diagram of the heating assembly of some embodiments of the present application;

[0059] Figure 5 Shows the equivalent circuit diagram of the heating assembly of some embodiments of the present application;

[0060] Figure 6 The equivalent circuit diagram of the heating component according to some embodiments of the present application is shown;

[0061] Figure 7 The structural schematic diagram of the heating component according to some embodiments of the present application is shown;

[0062] Figure 8 The structural schematic diagram of the heating component according to some embodiments of the present application is shown.

[0063] Reference numerals:

[0064] 100 Heating component, 102 Coil disc, 104 Resonant capacitor, 106 Inductor, 108 Switch device, 110 Control circuit, 112 Support frame, 114 Heat insulation part, 116 Magnetic part. Detailed implementation manners

[0065] 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 drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0066] 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.

[0067] The following refers to Figures 1 to 8 Describe the heating component and cooking device according to some embodiments of the present application.

[0068] In some embodiments of the present application, a heating component is provided. Figure 1 The equivalent circuit diagram of the heating component according to some embodiments of the present application is shown. As Figure 1 shown, the heating component 100 includes: a coil disc 102; a resonant capacitor 104, the resonant capacitor 104 is electrically connected to the coil disc 102; an inductor 106, the inductor 106 is electrically connected to the coil disc 102, and the inductor 106, the coil disc 102 and the resonant capacitor 104 can form a resonant circuit.

[0069] In this embodiment, the heating component 100 includes a coil disc 102, a resonant capacitor 104 and an inductor 106. Exemplarily, the coil disc 102 can be formed by winding a wire. The heating component 100 is specifically used to heat a load, where the load can be a cooking utensil such as a pot, a baking tray, a kettle, etc.

[0070] In the related art, for electromagnetic induction heating, the principle is that the control circuit 110 generates a rapidly changing magnetic field in the coil disk 102 through high-frequency power inverter switching devices, such as IGBT (Insulated Gate Bipolar Transistor) switching devices or MOS (Metal Oxide Semiconductor) switching devices. At this time, if the load placed on the coil disk 102 is a ferromagnetic load, such as a metal cookware, a large amount of eddy current will be generated on the load, and then Joule heat will be generated by the cookware itself.

[0071] Figure 2 The equivalent schematic diagram of the electromagnetic induction heating system of some embodiments of the present application is shown, such as Figure 2 shown. After placing the load on the coil disk 102, the coil disk 102 and the load can be equivalent to a set of an inductor Ls and a resistor Rs.

[0072] Such as Figure 1 shown. At this time, the coil disk 102, the resonant capacitor 104 and the load can be equivalent to a resonant circuit of an inductor and a resistor. After forming a resonant system, a large amount of Joule heat can be generated on the resistor (i.e., the load), realizing the heating function of the load.

[0073] For infrared radiation heating, due to the existence of an equivalent resistance in the coil disk 102 itself, Joule heat will also be generated by the coil disk 102 itself in the resonant system. In the electromagnetic heating appliances in the related art, such as induction cookers, in order to improve the heating effect of the load and at the same time suppress the heating effect of the coil disk 102 itself, Litz wire (a conductor is composed of multiple thinner independent insulated conductors twisted or braided together) is usually used to wind the coil disk 102, thereby effectively reducing the equivalent resistance of the coil disk 102 itself, such as suppressing the resistance of the coil disk 102 itself to below 0.5 Ω. Therefore, the self-heating of the coil disk 102 of this kind of electromagnetic heating appliance is controlled at a low level and cannot be used as an effective heat source. Therefore, it cannot heat non-ferromagnetic loads and has poor versatility.

[0074] In view of the above problems, the embodiments of the present application propose a heating component, which can not only heat a metal load by electromagnetic induction heating, but also use the heat generated by the coil disk 102 itself to heat the load. By increasing the equivalent internal resistance of the coil disk 102 and strengthening the structure, when the load of the coil disk 102 is not a ferromagnetic load, non-ferromagnetic loads such as ceramic cookware, glass cookware, and aluminum cookware can be heated by making the coil disk 102 itself generate heat.

[0075] Specifically, the coil disk 102 in the embodiments of the present application can be obtained by winding a single conductor cable, a multi-strand wire or a conductor strip, which significantly increases the equivalent internal resistance of the coil disk 102. When the heating assembly 100 is unloaded or heating a non-ferromagnetic load, the resonant system can still have sufficient equivalent inductance and equivalent resistance. At this time, the equivalent resistance is the impedance of the coil disk 102 itself. The resonant resistance can use the coil disk 102 itself as a heat source, and by generating eddy currents in the coil disk 102, the coil disk 102 itself generates heat, and transfers the heat to the load through heat radiation or heat conduction to achieve heating of the non-ferromagnetic load.

[0076] Among them, in order to obtain a suitable equivalent resistance, the material, size, etc. of the conductor cable of the coil disk 102 can be selected according to design requirements, such as the maximum heating power of the heating assembly 100, etc. As the load is different and the heating power is different, the equivalent internal resistance of the coil disk 102 will also change. When the equivalent resistance of the coil disk 102 is less than the appropriate equivalent resistance, the resonant current in the resonant system will increase significantly, resulting in the resonant current exceeding the limit. The excessive resonant current will increase the stress of high-frequency inverter power switching devices (such as IGBT high-frequency inverter power switching devices) and resonant devices, making the high-frequency power devices in an unfavorable working condition.

[0077] To solve the above problems, the embodiments of the present application add an inductor 106 and electrically connect the inductor 106 to the coil disk 102. When the equivalent resistance of the coil disk 102 is less than the appropriate equivalent resistance, the added inductor 106 can suppress the resonant current, effectively preventing the resonant current from increasing rapidly and causing the current to exceed the limit, reducing the stress of the resonant system, and preventing the resonant system from malfunctioning due to overcurrent.

[0078] Among them, the inductor 106 can be set as a conventional independent inductor component, or can be a part of the coil disk 102 and wound concentrically with the coil disk 102.

[0079] By arranging an inductor 106 electrically connected to the coil disk 102 in the heating assembly 100, when heating a non-ferromagnetic load through the coil disk 102, the inductor 106 can suppress the resonant current in the resonant system when the equivalent resistance of the coil disk 102 is insufficient, thereby reducing the stress of the resonant system, enabling the electromagnetic induction system to heat the non-ferromagnetic load by making the coil disk 102 itself generate heat, achieving electromagnetic induction heating of ferromagnetic loads and radiative heating of non-ferromagnetic loads through a single coil disk 102, without adding an additional heating wire coil, and reducing the equipment cost of hybrid heating.

[0080] In some embodiments of the present application, optionally, the coil disk 102 is connected in series with the inductor 106 to form an inductive loop.

[0081] In this embodiment, as Figure 1 shown, the inductor 106 is connected in series with the coil disk 102. Specifically, the first end of the inductor 106 is electrically connected to the first end of the coil disk 102. When heating a non-ferromagnetic load, the equivalent resistance of the coil disk 102 forms the "load" in the resonant circuit. At this time, eddy currents are formed inside the coil disk 102 in the resonant circuit, generating Joule heat inside the coil disk 102, thereby realizing the heating of the actual load on the heating assembly 100.

[0082] When the equivalent resistance of the coil disk 102 is small, a relatively large resonant current may be generated in the resonant circuit. At this time, this part of the resonant current will enter the inductive circuit and be suppressed by the inductor 106 connected in series with the coil disk 102 in the inductive circuit, controlling the resonant current within a reasonable range to avoid excessive stress on high-frequency power devices in the resonant system, such as inverter devices and high-frequency inverter power switch devices.

[0083] In the embodiment of the present application, the resonant current is suppressed by connecting the inductor 106 in series with the coil disk 102, reducing the stress of the resonant system, and improving the reliability of the heating assembly 100.

[0084] In some embodiments of the present application, optionally, Figure 3 shows the equivalent circuit diagram of the heating assembly 100 in some embodiments of the present application. As Figure 3 shown, the inductor 106 is connected in series with the inductive circuit.

[0085] In this embodiment, the coil disk 102, the inductor 106, and the resonant capacitor 104 form a series resonant circuit. Specifically, in the resonant system, the coil disk 102 can be equivalently regarded as a series-connected inductor Ls and resistor R. At this time, it is considered that the first end of the inductor Ls is electrically connected to the first end of the resistor R. In the series resonant circuit, it can be equivalently regarded that the first end of the inductor Ls is electrically connected to the first end of the resistor R, the second end of the inductor Ls is electrically connected to the inductor 106, and the second end of the resistor R is electrically connected to the resonant capacitor 104.

[0086] In the embodiment of the present application, by forming a series resonant circuit with the coil disk 102, the inductor 106, and the resonant capacitor 104, when the resonant current in the resonant circuit exceeds the limit, the inductor 106 can suppress the excessive resonant current, thereby reducing the system stress and ensuring the reliability of the heating assembly 100.

[0087] In some embodiments of the present application, optionally, as Figure 1 shown, the inductor 106 is connected in parallel with the inductive circuit.

[0088] In this embodiment, the coil disk 102 and the inductor 106 are connected in series to form an inductive loop, and a capacitor is connected in parallel with the inductive loop to form a resonant loop. Specifically, in the resonant system, the coil disk 102 can be equivalent to a series-connected inductor Ls and a resistor R. At this time, it is considered that the first end of the inductor Ls is electrically connected to the first end of the resistor R. In the parallel resonant loop, it can be equivalent that the first end of the inductor Ls is electrically connected to the first end of the resistor R, the second end of the inductor Ls is electrically connected to the first end of the inductor 106, the first end of the capacitor is electrically connected to the second end of the inductor 106, and the second end of the capacitor is electrically connected to the second end of the resistor R.

[0089] In the embodiment of the present application, by connecting the coil disk 102 and the inductor 106 in series to form an inductive loop, and connecting the inductive loop and the resonant capacitor 104 in parallel to form a parallel resonant loop, when the resonant current in the resonant loop exceeds the limit, the inductor 106 can suppress the excessive resonant current, thereby reducing the system stress and ensuring the reliability of the heating component 100.

[0090] In some embodiments of the present application, optionally, Figure 4 The equivalent circuit diagram of the heating component 100 in some embodiments of the present application is shown. As Figure 4 shown, the heating component 100 further includes: a switching device 108, which is connected in parallel with the inductor 106.

[0091] In this embodiment, a switching device 108 connected in parallel with the inductor 106 is further provided in the heating component 100. When the switching device 108 is disconnected, the inductor 106 is connected in series with the coil disk 102. At this time, the inductor 106 can limit the resonant current in the resonant system. When the switching device 108 is closed, the inductor 106 is short-circuited by the switching device 108. At this time, the inductor 106 no longer limits the resonant current in the resonant system.

[0092] Specifically, when the heating component 100 is working, the control circuit 110 of the heating component 100 detects the load condition and adjusts the resonant parameters of the resonant system, such as the resonant frequency, the switching frequency of the IGBT, the duty cycle of the IGBT, etc.

[0093] When the load is a non-metallic load (non-ferromagnetic load), the coil current is increased to make the coil generate heat more easily. At this time, if the equivalent resistance of the coil disk 102 is less than a preset resistance threshold, the control switch device 108 is disconnected to connect the inductor 106 in series with the coil disk 102, and the resonant current is reduced through the inductor 106 to reduce the system stress.

[0094] When heating a non - metallic load (non - ferromagnetic load), if the equivalent resistance of the coil disk 102 is greater than the resistance threshold, or when heating a metallic load (ferromagnetic load), the control switch device 108 is closed to short - circuit the inductor 106. At this time, the inductor 106 no longer suppresses the resonant current, reducing the overall inductance of the resonant system, increasing the current of the resonant system, thereby obtaining a greater power output and improving the heating efficiency.

[0095] Exemplarily, for the case where the resonant capacitor 104 is in parallel with the inductive loop, the setting manner of the switch device 108 is as Figure 4 shown.

[0096] Exemplarily, Figure 5 The equivalent circuit diagram of the heating component 100 of some embodiments of the present application is shown. For the case where the resonant capacitor 104 is in series with the inductive loop, the setting manner of the switch device 108 is as Figure 5 shown.

[0097] By setting the switch device 108 in the embodiments of the present application and selecting whether to connect the inductor 106 according to different load states, on the one hand, the resonant current can be suppressed when the resonant current exceeds the limit, reducing the system stress, and on the other hand, the power output of the heating component 100 can be increased when the resonant current does not exceed the limit, ensuring the heating efficiency.

[0098] In some embodiments of the present application, optionally, the heating component 100 is used to heat cookware, Figure 6 The equivalent circuit diagram of the heating component 100 of some embodiments of the present application is shown. As Figure 6 shown, the heating component 100 further includes: a control circuit 110 for detecting the type of the cookware on the heating component 100 and controlling the switch device 108 to be closed or opened according to the type of the cookware.

[0099] In this embodiment, the heating component 100 includes a control circuit 110. The control circuit 110 is used to control the high - frequency resonant power switch device 108 in the heating component 100, such as an IGBT, to work at a switching frequency and duty cycle that match the heating power selected by the user, and is also used to control the switch device 108 in parallel with the inductor 106, thereby selecting whether to connect the inductor 106.

[0100] The control circuit 110 is further used to detect the type of the cookware on the current heating component 100. Exemplarily, the types of cookware include ferromagnetic cookware and non - ferromagnetic cookware.

[0101] In some embodiments, the control circuit 110 can determine the type of cookware according to the cooking instructions input by the user. For example, a human-machine interaction interface is provided on the cooking device applying the embodiments of the present application, and the user can manually input the type of cookware currently in use, or select the type of cookware currently in use from a plurality of preset cookware types.

[0102] In some other embodiments, the control circuit 110 includes a detection circuit, and the detection circuit can detect the type of cookware placed on the current coil disk 102. Exemplarily, the detection circuit can be a magnetic detection circuit, and the magnetic detection circuit can detect whether the cookware is a ferromagnetic cookware.

[0103] The embodiments of the present application can control the closing or opening of the switching device 108 according to the detected type of cookware, which can avoid excessive resonance current, reduce the system stress, and ensure the heating efficiency of the coil at the same time.

[0104] In some embodiments of the present application, optionally, the control circuit 110 is specifically configured to control the switching device 108 to close when the type of cookware is a metal cookware, or control the switching device 108 to open when the type of cookware is a non-metal cookware.

[0105] In this embodiment, when it is detected that the type of cookware is a ferromagnetic cookware, the switching device 108 is controlled to close, so that the inductor 106 is short-circuited. At this time, the inductor 106 no longer suppresses the resonance current, reducing the overall inductance of the resonance system, increasing the current of the resonance system, thereby obtaining a greater power output and improving the heating efficiency.

[0106] When it is detected that the type of cookware is a non-ferromagnetic cookware, the switching device 108 is controlled to open, so that the inductor 106 is connected in series with the coil disk 102, and the resonance current is reduced through the inductor 106 to reduce the system stress.

[0107] The embodiments of the present application determine whether to connect the inductor 106 according to the type of cookware, which can ensure the heating efficiency of electromagnetic induction heating and reduce the system stress when the coil generates heat at the same time.

[0108] In some embodiments of the present application, optionally, Figure 7 , a schematic structural diagram of a heating component according to some embodiments of the present application is shown. Figure 8 A schematic structural diagram of a heating component according to some embodiments of the present application is shown, as Figure 7 and Figure 8 shown, the coil disk 102 includes a wire harness, and the heating component 100 further includes: a support frame 112, and the wire harness is wound around the support frame 112 to form the coil disk 102.

[0109] In this embodiment, the coil disk 102 includes a wire harness. Exemplarily, parameters such as the material, length, and cross-sectional area of the wire harness are associated with the equivalent resistance of the desired coil disk 102. Since there is no need to pursue a smaller resistance, the usage restrictions on the winding materials can be alleviated, such as the restrictions on resistivity and antioxidant properties, and materials that are cheaper and more conventional than Litz wire can be used to wind the coil disk 102.

[0110] The wire harness is wound on the support frame 112 to form the above-mentioned coil disk 102. Among them, the support frame 112 is used to protect, position, and support the coil disk 102 and other working structures of the heating component 100. The coil disk 102 is arranged on the support frame 112. After the coil disk 102 is powered on, under the action of the resonant circuit, a resonant current and an alternating magnetic field can be generated in the coil disk 102. At this time, the support frame 112 can prevent interference between the coil disk 102 and other functional components, and improve the reliability of the heating component 100.

[0111] In some embodiments of the present application, such as Figure 7 and Figure 8 as shown, optionally, the heating component 100 further includes: a heat insulation part 114, and the heat insulation part 114 is arranged on the support frame 112 and is located on the side of the coil disk 102 close to the support frame 112.

[0112] In this embodiment, since the coil disk 102 provided in the embodiment of the present application can not only generate an alternating magnetic field through resonance, so as to generate eddy current on a ferromagnetic metal cookware and make the cookware heat up, but also generate heat by using its own impedance and taking the coil itself as a "load", that is, the coil disk 102 itself can heat the cookware by generating heat.

[0113] When the coil disk 102 generates heat by itself, the temperature of the coil disk 102 is relatively high. By adding the heat insulation part 114, on the one hand, it can prevent the high temperature of the coil disk 102 from damaging other electrical components, and on the other hand, the heat insulation part 114 can reflect the heat at the bottom of the coil disk towards the top direction of the coil disk, that is, the direction where the cookware is placed, so as to achieve the effect of concentrating the heat on the cookware and improving the heating efficiency.

[0114] In some embodiments of the present application, such as Figure 7 and Figure 8 as shown, optionally, the heating component 100 further includes: a magnetic part 116, and the magnetic part 116 is arranged on the support frame 112, and the heat insulation part 114 is located between the coil disk 102 and the magnetic part 116.

[0115] In this embodiment, the heating assembly 100 further includes a magnetic member 116. The magnetic member 116 is disposed at the bottom of the coil disk 102 and fixed by a support frame 112. The magnetic member 116 and the coil disk 102 are isolated by a heat insulation portion 114. The magnetic member can confine the magnetic field, making the magnetic field concentrated on the load, protecting the electrical components under the support frame, and improving the heating efficiency at the same time.

[0116] In some embodiments of the present application, a cooking device is provided, including the heating assembly provided in any of the above embodiments. Therefore, this cooking device also includes all the beneficial effects of the heating assembly provided in any of the above embodiments. To avoid repetition, they will not be described herein again.

[0117] In the description of the present 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, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0118] In the description of the present 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 the present application. In the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0119] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A heating component, characterized in that, the heating component includes: a coil disk; a resonant capacitor electrically connected to the coil disk; an inductor electrically connected to the coil disk, and the inductor, the coil disk and the resonant capacitor can form a resonant circuit.

2. The heating component according to claim 1, characterized in that, the coil disk is connected in series with the inductor to form an inductive circuit.

3. The heating component according to claim 2, characterized in that, the inductor is connected in series with the inductive circuit.

4. The heating component according to claim 2, characterized in that, the inductor is connected in parallel with the inductive circuit.

5. The heating component according to claim 2, characterized in that, further includes: a switching device connected in parallel with the inductor.

6. The heating component according to claim 5, characterized in that, the heating component is used to heat cookware, and the heating component further includes: a control circuit for detecting the type of the cookware and controlling the switching device to close or open according to the type of the cookware.

7. The heating component according to claim 6, characterized in that, the control circuit is specifically configured to control the switching device to close when the type of the cookware is metal cookware, or control the switching device to open when the type of the cookware is non-metal cookware.

8. The heating component according to any one of claims 1 to 7, characterized in that, the coil disk includes a wire harness, and the heating component further includes: a support frame, and the wire harness is wound on the support frame to form the coil disk.

9. The heating component according to claim 8, characterized in that, further includes: a heat insulation part provided on the support frame and located on one side of the coil disk close to the support frame.

10. The heating component according to claim 9, characterized in that, further includes: a magnetic member provided on the support frame, and the heat insulation part is located between the coil disk and the magnetic member.

11. A cooking device, characterized in that, includes: the heating component according to any one of claims 1 to 10.

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