Electromagnetic heating circuit, control method and apparatus for electric device, and electric device

Abstract

Disclosed in the present application are an electromagnetic heating circuit, a control method and apparatus for an electric device, and an electric device. The circuit comprises: at least two resonance modules; at least two switch modules, wherein each of the switch modules comprises a fixed end, a movable end, a first position end and a second position end, the at least two switch modules and the at least two resonance modules are arranged in a manner of corresponding to each other on a one-to-one basis, and the fixed end of each switch module is connected to the corresponding resonance module; an inverter module, which is connected to the first position end; a gating module, which is connected to the second position end; an oscillation driving module, which is connected to the gating module; a voltage processing module, which is connected to the oscillation driving module; and a control module, which is connected to the inverter module, the voltage processing module, the gating module and the at least two switch modules. By means of the technical solution provided in the embodiments of the present application, when some resonance modules in an electromagnetic heating circuit are in a heating state, whether there is cookware being placed at positions corresponding to other resonance modules which are not in a heating state can also be detected.

Description

Electromagnetic heating circuit, control method and device of electrical equipment, and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number CN202311440658.X filed with the Patent Office of China on October 31, 2023, entitled “Electromagnetic heating circuit, control method, device and electrical equipment for electrical equipment”, the entire contents of which are incorporated by reference into this application.

[0003] This application claims priority to the Chinese patent application with application number CN202311440643.3 filed with the Patent Office of China on October 31, 2023, entitled “Electromagnetic heating circuit, control method, device and electrical equipment for electrical equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0004] The embodiments of the present application relate to the field of electrical technology, and in particular to an electromagnetic heating circuit, a control method and device for electrical equipment, and the electrical equipment. Background Art

[0005] Electromagnetic heating equipment (such as induction cookers, electromagnetic integrated stoves, etc.) is a widely used household appliance that is made based on the principle of electromagnetic induction.

[0006] Electromagnetic heating equipment typically controls the heating coils to begin heating after detecting that they are covered with a cookware. The electromagnetic heating equipment detects cookware by sending a control signal to connect each heating coil to an inverter module, controlling the inverter module to output one or more cycles of a detection signal, and acquiring the current signal characteristics flowing through each heating coil to detect whether the heating coil is covered with a cookware. If so, the heating coil remains connected to the inverter module and a drive pulse signal is sent to the heating coil via the inverter module to initiate heating. If not, the heating coil is disconnected from the inverter module.

[0007] However, for the heating coil disconnected from the inverter module, the electromagnetic heating device cannot detect whether it is covered with a cookware. That is, when there are multiple heating coils in the electromagnetic heating device and some of the heating coils have started heating, the electrical device cannot detect the cookware for the heating coils that have not started heating.

[0008] Summary of the Invention

[0009] The present application proposes an electromagnetic heating circuit, a control method and device for electrical equipment, and the electrical equipment.

[0010] In a first aspect, an embodiment of the present application provides an electromagnetic heating circuit, which includes: at least two resonant modules; at least two switch modules, the switch module including a fixed end, a movable end, a first position end and a second position end; at least two switch modules and at least two resonant modules are arranged in a one-to-one correspondence, and the fixed end of each switch module is connected to the corresponding resonant module; an inverter module, connected to the first position end; a gating module, connected to the second position end; an oscillation drive module, connected to the gating module; the oscillation drive module is configured to: send an oscillation drive signal to a target resonant module among the at least two resonant modules; a voltage processing module, connected to the oscillation drive module; the voltage processing module is configured to: process the output voltage of the oscillation drive module to obtain a voltage processing result; a control module, connected to the inverter module, the voltage processing module, the gating module and at least two switch modules; the control module is configured to: determine the target resonant module, and control the gating module to select and conduct the loop between the target resonant module and the oscillation drive module; obtain the voltage processing result output by the voltage processing module, and detect whether the target position corresponding to the target resonant module has a pot placed thereon.

[0011] In a second aspect, an embodiment of the present application further provides an electromagnetic heating circuit, which includes: at least two resonant modules; at least two switch modules, the switch module including a fixed end, a movable end, a first position end, and a second position end; at least two switch modules and at least two resonant modules are arranged in a one-to-one correspondence, and the fixed end of each switch module is connected to the corresponding resonant module; an inverter module, connected to the first position end; a gating module, connected to the second position end; an oscillation drive module, connected to the gating module; the oscillation drive module is configured to: send an oscillation drive signal to a target resonant module in the at least two resonant modules; a comparison module, connected to the oscillation drive module; the comparison module is configured to: compare the output voltage of the oscillation drive module with a specified The voltage magnitude relationship is obtained to obtain a comparison result; a control module is connected to the inverter module, the comparison module, the selection module and at least two switch modules; the control module is configured to: control the active end of the first switch module in the at least two switch modules to contact the second position end; determine the target resonant module in the resonant module connected to the first switch module, and control the selection module to select and conduct the loop between the target resonant module and the oscillation drive module; obtain the comparison result output by the comparison module; determine the oscillation parameters of the target resonant module based on the comparison result, the oscillation parameters of the target resonant module include the oscillation period and / or oscillation frequency; based on the oscillation parameters of the target resonant module, detect whether the target position corresponding to the target resonant module has a pot placed.

[0012] In a third aspect, an embodiment of the present application also provides a control method for an electrical device, which is applied to an electromagnetic heating circuit such as in the second aspect, and the method includes: controlling the active end of the first switch module among at least two switch modules to contact the second position end; determining the target resonant module in the resonant module connected to the first switch module, and controlling the selection module to select the loop between the target resonant module and the oscillation drive module of the conduction comparison module; the oscillation drive module is used to send an oscillation drive signal to the target resonant module; obtaining the comparison result output by the comparison module; determining the oscillation parameters of the target resonant module based on the comparison result, the oscillation parameters of the target resonant module including the oscillation period and / or oscillation frequency; based on the oscillation parameters of the target resonant module, detecting whether a pot is placed at the target position corresponding to the target resonant module.

[0013] In a fourth aspect, an embodiment of the present application further provides a control device for an electrical device, which is applied to an electromagnetic heating circuit as in the second aspect, and the device includes: a first control module, used to control the contact between the active end of the first switch module and the second position end of at least two switch modules; a second control module, used to determine the target resonant module in the resonant module connected to the first switch module, and control the selection module to select and conduct the loop between the target resonant module and the oscillation drive module, the oscillation drive module is used to send an oscillation drive signal to the target resonant module; a first result acquisition module, used to obtain the comparison result output by the comparison module; an oscillation parameter determination module, used to determine the oscillation parameters of the target resonant module based on the comparison result, the oscillation parameters of the target resonant module include an oscillation period and / or an oscillation frequency; a first pot detection module, used to detect whether a pot is placed at the target position corresponding to the target resonant module based on the oscillation parameters of the target resonant module.

[0014] In the fifth aspect, an embodiment of the present application also provides an electrical device, which includes an electromagnetic heating circuit as in the second aspect; a control module in the electromagnetic heating circuit includes one or more processors; a memory; and one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by one or more processors, and the one or more applications are configured to execute the method as in the third aspect.

[0015] In a sixth aspect, an embodiment of the present application further provides an electromagnetic heating circuit, which includes: at least two resonant modules; at least two switch modules, the switch module including a fixed end, a movable end, a first position end, and a second position end; at least two switch modules and at least two resonant modules are arranged in a one-to-one correspondence, and the fixed end of each switch module is connected to the corresponding resonant module; an inverter module is connected to the first position end; a gating module is connected to the second position end; an oscillation drive module is connected to the gating module; the oscillation drive module is configured to: send an oscillation drive signal to a target resonant module in the at least two resonant modules; a voltage signal extraction module is connected to the oscillation drive module; the voltage signal extraction module is configured to: based on the oscillation The amplitude of the output signal of the driving module is used to output the peak voltage signal of the oscillation driving module; the control module is connected to the inverter module, the voltage signal extraction module, the gating module and at least two switch modules; the control module is configured to: control the active end of the first switch module among the at least two switch modules to contact the second position end; determine the target resonant module in the resonant module connected to the first switch module, and control the gating module to select and conduct the loop between the target resonant module and the oscillation driving module; obtain the output result of the voltage signal extraction module, the output result is the peak voltage signal of the oscillation driving module; based on the peak voltage signal of the oscillation driving module, detect whether the target position corresponding to the target resonant module has a pot placed.

[0016] In the seventh aspect, an embodiment of the present application also provides a control method for electrical equipment, which is applied to the electromagnetic heating circuit as in the sixth aspect, and the method includes: controlling the active end of the first switch module among at least two switch modules to contact the second position end; determining the target resonant module in the resonant module connected to the first switch module, and controlling the selection module to select and conduct the loop between the target resonant module and the oscillation drive module; the oscillation drive module is used to send an oscillation drive signal to the target resonant module; obtaining the output result of the voltage signal extraction module, the output result is the peak voltage signal output by the oscillation drive module; based on the peak voltage signal of the oscillation drive module, detecting whether a pot is placed at the target position corresponding to the target resonant module.

[0017] In the eighth aspect, an embodiment of the present application also provides a control device for electrical equipment, which is applied to the electromagnetic heating circuit as in the sixth aspect, and the device includes: a first control module, which is used to control the contact between the active end of the first switch module and the second position end among at least two switch modules; a second control module, which is used to determine the target resonant module in the resonant module connected to the first switch module, and control the selection module to select the circuit between the target resonant module and the oscillation drive module, and the oscillation drive module is used to send an oscillation drive signal to the target resonant module; a second result acquisition module, which is used to obtain the output result of the voltage signal extraction module, and the output result is the peak voltage signal of the oscillation drive module; a second pot detection module, which is used to detect whether a pot is placed at the target position corresponding to the target resonant module based on the peak voltage signal of the oscillation drive module.

[0018] In the ninth aspect, an embodiment of the present application also provides an electrical device, which includes an electromagnetic heating circuit as in the sixth aspect; a control module in the electromagnetic heating circuit includes one or more processors; a memory; one or more applications, wherein one or more applications are stored in the memory and configured to be executed by one or more processors, and the one or more applications are configured to execute the method as in the seventh aspect.

[0019] In the tenth aspect, an embodiment of the present application provides a computer-readable storage medium, in which program code is stored, and the program code is called by a processor to execute the method in the third aspect or the seventh aspect.

[0020] In an eleventh aspect, an embodiment of the present application provides a computer program product, which, when executed, is used to implement the method in the third aspect or the seventh aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] FIG1 is a structural diagram of an electromagnetic heating circuit provided in one embodiment of the present application.

[0023] FIG2 is a circuit diagram of an electromagnetic heating circuit provided in one embodiment of the present application.

[0024] FIG3 is a diagram showing the relationship between the inductance of a heating coil and the distance between the heating coil and a metal cookware according to an embodiment of the present application.

[0025] FIG4 is a waveform diagram of the output voltage of the oscillation driving module and a waveform diagram of the comparison structure output by the comparison module provided in one embodiment of the present application.

[0026] FIG5 is a schematic diagram of an electrical device provided in one embodiment of the present application.

[0027] FIG6 is a flow chart of a method for controlling an electrical device provided in one embodiment of the present application.

[0028] FIG7 is a flow chart of a method for controlling an electrical device provided in another embodiment of the present application.

[0029] FIG8 is a block diagram of a control device for an electrical device provided by an embodiment of the present application.

[0030] FIG9 is a structural block diagram of an electrical device provided in one embodiment of the present application.

[0031] FIG10 is a structural diagram of an electromagnetic heating circuit provided in another embodiment of the present application.

[0032] FIG11 is a circuit diagram of an electromagnetic heating circuit provided in another embodiment of the present application.

[0033] FIG12 is a diagram showing the relationship between the equivalent resistance of a heating coil and the distance between the heating coil and the metal cookware according to another embodiment of the present application.

[0034] FIG13 is a waveform diagram of an oscillation waveform output by an oscillation driving module and a schematic diagram of a peak voltage signal extracted by a voltage signal extraction module according to another embodiment of the present application.

[0035] FIG14 is a schematic diagram of an electrical device provided in another embodiment of the present application.

[0036] FIG15 is a flowchart of a method for controlling an electrical device provided in yet another embodiment of the present application.

[0037] FIG16 is a flowchart of a method for controlling an electrical device provided in yet another embodiment of the present application.

[0038] FIG17 is a block diagram of a control device for an electrical device provided in another embodiment of the present application.

[0039] FIG18 is a structural block diagram of an electrical device provided in another embodiment of the present application.

[0040] FIG19 is a structural diagram of an electromagnetic heating circuit provided in yet another embodiment of the present application.

[0041] FIG20 is a block diagram of a computer-readable storage medium according to an embodiment of the present application. DETAILED DESCRIPTION

[0042] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0043] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0044] Please refer to Figure 1, which shows a structural diagram of an electromagnetic heating circuit 100 provided in one embodiment of the present application. The electromagnetic heating circuit 100 includes at least two resonant modules 10, at least two switch modules 20, an inverter module 30, a gating module 40, an oscillation drive module 50, a comparison module 601, and a control module 70.

[0045] The resonance module 10 is used to generate high-frequency resonance, so that the heating coil in the resonance module 10 generates an alternating magnetic field. When the iron-containing container is placed at the position corresponding to the above-mentioned heating coil, the iron-containing container cuts the magnetic lines of force of the alternating magnetic field, thereby generating eddy currents at the bottom of the container. The eddy currents cause the carriers at the bottom of the container to move irregularly at high speed, and the carriers and atoms collide and rub against each other to generate heat energy, thereby playing a heating role.

[0046] The switch module 20 is used to connect or disconnect the circuit between the resonant module 10 and the inverter module 30, and to connect or disconnect the circuit between the resonant module 10 and the gating module 40. When the circuit between the resonant module 10 and the inverter module 30 is connected, the circuit between the resonant module 10 and the gating module 40 is disconnected; when the circuit between the resonant module 10 and the inverter module 30 is disconnected, the circuit between the resonant module 10 and the gating module 40 is connected.

[0047] Each switch module 20 includes a fixed end 210, a movable end 220, a first position end 230, and a second position end 240. At least two switch modules 20 are provided in a one-to-one correspondence with at least two resonant modules 10. The fixed end 210 of each switch module 20 is connected to a corresponding resonant module 10. Therefore, the number of switch modules 20 and resonant modules 10 is the same. The first position end 230 of the switch module 20 is connected to the inverter module 30. When the movable end 220 of the switch module 20 contacts the first position end 230, the circuit between the resonant module 10 connected to the switch module 20 and the inverter module 30 is conductive. The second position end of the switch module 20 is connected to the gating module 40. When the movable end 220 of the switch module 20 contacts the second position end 240, the circuit between the resonant module 10 connected to the switch module 20 and the gating module 40 is conductive.

[0048] The inverter module 30 is used to convert DC power into high-frequency AC power, which is then output as a stable AC power source through a transformer and filter circuit. The selection module 40 is used to select and connect the circuit between a specific resonant module 10 and the oscillation drive module 50. The oscillation drive module 50 is connected to the selection module 40 and is used to send an oscillation drive signal to the resonant module 10 selected by the selection module 40. The comparison module 601 is connected to the oscillation drive module 50 and is used to compare the output voltage of the oscillation drive module 50 with a specified voltage to obtain a comparison result.

[0049] The control module 70 is connected to the comparison module 601, the inverter module 30, the gating module 40, and at least two switch modules 10. The control module 70 is configured to: control the active end 220 of the first switch module of the at least two switch modules 20 to contact the second position end 240; determine a target resonant module in the resonant module 10 connected to the first switch module, and control the gating module to select and connect the circuit between the target resonant module and the oscillation drive module 50, which is used to send an oscillation drive signal to the target resonant module; obtain the frequency detection result of the target resonant module output by the comparison module 601, which indicates whether the oscillation frequency of the oscillation sent by the target resonant module based on the oscillation drive signal is greater than a specified frequency; and determine whether a cookware is placed at the target position corresponding to the target resonant module based on the frequency detection result of the target resonant module. The implementation details of the cookware detection performed by the control module 70 will be described in the method embodiments below.

[0050] After the oscillation drive module 50 sends an oscillation drive signal to the target resonant module selected for conduction by the selection module 40, the resonant module, under the action of the oscillation drive signal, forms a capacitive three-point oscillation circuit with the oscillation drive module 50. The oscillation frequency of the capacitive three-point oscillation circuit is determined by the inductance of the heating coil in the target resonant module and the capacitance of the entire circuit. The inductance of the heating coil in the target resonant module varies depending on whether a cookware is placed at the target location. Therefore, by detecting the oscillation frequency of the above-mentioned capacitive three-point oscillation circuit, it is possible to determine whether a cookware is placed at the target location. The above-mentioned cookware detection process does not involve the inverter module 30. Under the premise that the inverter module 30 sends a drive pulse signal to other resonant modules 10 other than the target resonant module, it is also possible to detect whether a cookware is placed at the target location corresponding to the target resonant module. That is, the electromagnetic heating circuit provided in the embodiment of the present application can detect whether a cookware is placed at the location corresponding to other resonant modules 10 that are not in the heating state even when some resonant modules 10 in the electromagnetic heating circuit 100 are in the heating state.

[0051] In some embodiments, the electromagnetic heating circuit 100 further includes an AC power supply module 80 and a rectifier and filter module 90. The AC power supply module 80 is configured to provide AC power to the electromagnetic heating circuit 100. The rectifier and filter module 90 is configured to convert the AC power signal output by the AC power supply module 80 into a DC power signal and filter out high-frequency noise in the DC power signal, thereby making the output power signal more stable. The AC power supply module 80 is connected to the input end of the rectifier and filter module 90, and the output end of the rectifier and filter module 90 is connected to the inverter module 30.

[0052] In summary, the electromagnetic heating circuit provided in the embodiment of the present application adds an oscillation drive module, a gating module and a comparison module to the electromagnetic heating circuit. The oscillation drive module sends an oscillation drive signal to the target resonance module selected for conduction by the gating module. The comparison module converts the analog signal output by the oscillation drive module into a digital signal. The control module can determine the oscillation parameters (oscillation period or oscillation frequency) of the target resonance module according to the comparison result output by the comparison module, and then perform pot detection based on the above oscillation parameters. Since the resonance module forms a capacitor three-point oscillation circuit with the oscillation drive module under the action of the oscillation drive signal, the oscillation parameters of the capacitor three-point oscillation circuit are determined by the target resonance module. The inductance of the heating coil in the target resonant module and the capacitance of the entire circuit are determined, and the inductance of the heating coil in the target resonant module changes with whether a cookware is placed at the target position. Therefore, by detecting the oscillation parameters of the above-mentioned capacitor three-point oscillation circuit, it is possible to determine whether a cookware is placed at the target position. The above-mentioned cookware detection process does not involve the inverter module. On the premise that the inverter module sends a driving pulse signal to other resonant modules other than the target resonant module, it is also possible to detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in the heating state, it is also possible to detect whether a cookware is placed at the position corresponding to other resonant modules that are not in the heating state.

[0053] The various modules involved in the electromagnetic heating circuit 100 provided in FIG1 are described below in conjunction with FIG2. FIG2 shows a circuit diagram of the electromagnetic heating circuit 100 provided in another embodiment of the present application.

[0054] The resonant module 10 includes a heating coil 11 and at least one resonant capacitor 12. The heating coil 11 is used to generate an alternating magnetic field during resonance. When a ferrous container is placed in the position corresponding to the heating coil, the ferrous container cuts the magnetic lines of force of the alternating magnetic field, thereby generating eddy currents at the bottom of the container. The eddy currents cause carriers at the bottom of the container to move at high speed and irregularly. The carriers collide and rub against atoms, generating heat energy, thereby heating the container. The resonant capacitor 12 is used to adjust the resonant frequency, helping the resonant module 10 achieve strong feedback and enhance oscillations in the circuit. In the embodiment of FIG2 , the resonant module 10 includes a heating coil 110 and two resonant capacitors 120 (a first resonant capacitor C11 and a second resonant capacitor C12). The first resonant capacitor C11 and the second resonant capacitor C12 are connected in series to form a series branch. One end of the series branch is connected to the first end of the inverter module 30, and the other end of the series branch is connected to the second end of the inverter module 30. The first end of the heating coil 110 is connected to the common end of the first resonant capacitor C11 and the second resonant capacitor C12.

[0055] In the embodiment of Figure 2, the switch module 20 is a single-pole double-throw switch, the fixed end 210 of the switch module 20 is connected to the second end of the heating coil 11, the first position end 230 of the switch module 20 is connected to the inverter module 30, and the second position end 240 of the switch module 20 is connected to the selection module 40.

[0056] The inverter module 30 is used to convert DC power into fixed frequency and voltage or frequency and voltage regulated AC power. The inverter module 30 can be a half-bridge inverter circuit, a full-bridge inverter circuit, or a single-tube inverter circuit. The embodiment of the present application does not limit its implementation form. In the embodiment of Figure 2, the inverter module 30 is a half-bridge inverter circuit composed of a first insulated gate bipolar transistor (IGBT) Q1 and a second insulated gate bipolar transistor Q2. The collector of Q1 is connected to the rectifier and filter module 80 and one end of the series branch (the series branch formed by the first resonant capacitor C11 and the second resonant capacitor C12 in series), the emitter of Q2 is connected to the collector of Q2, the emitter of Q2 is connected to the rectifier and filter module 80 and the other end of the series branch, and the gates of Q1 and Q2 are respectively connected to the control module 70.

[0057] The gating switch 40 is a multiple-to-one analog switch. The gating switch 40 includes a common terminal, multiple select terminals, and a control terminal. The common terminal of the gating switch 40 is connected to the output terminal of the oscillation drive module 50. At least two select terminals are provided in a one-to-one correspondence with at least two switch modules 20, each select terminal being connected to the second position terminal 240 of a corresponding switch module 20. The number of select terminals can be greater than or equal to the number of switch modules 210. If the number of select terminals is greater than the number of switch modules 20, some select terminals will be unconnected. The control terminal is connected to the control module 70. The number of control terminals is determined by the number of select terminals. For example, if there are 8 select terminals, the number of control terminals is 3; for another example, if there are 16 select terminals, the number of control terminals is 4. In the embodiment of FIG2 , the gating switch 40 is an eight-to-one analog switch, comprising 8 select pins (i.e., select terminals), namely Y0 to Y7; 3 control pins (i.e., control terminals), namely S0, A1, and A2; and a common pin z (i.e., a common terminal).

[0058] In the embodiment of FIG. 2 , the oscillation driving module 50 includes a fifth resistor 510 , a sixth resistor 520 , a seventh resistor 530 , an eighth resistor 540 , a transistor 550 , a second capacitor 560 , a third capacitor 570 , and a fourth capacitor 580 .

[0059] The fifth resistor 510 and the sixth resistor 520 are connected in series to form a third series branch. One end of the third series branch is connected to the second designated power source, and the other end of the third series branch is grounded. The common end of the fifth resistor 510 and the sixth resistor 520 is connected to the base of the transistor 550. The fifth resistor 510 and the sixth resistor 520 are used to provide a voltage divider for the base of the transistor 550. The second designated power source can be a +5V low voltage, so that the base voltage of the transistor 550 is 2.5V. One end of the seventh resistor 530 is connected to the second designated power source, and the other end of the seventh resistor 530 is connected to the collector of the transistor 550. The seventh resistor 530 is used to divide the collector voltage of the transistor 550. One end of the eighth resistor 540 is connected to the emitter of the transistor 550, and the other end is grounded. The eighth resistor 540 is used to divide the emitter voltage of the transistor 550. One end of the second capacitor 560 is connected to the base of the transistor 550, and the other end is grounded. Second capacitor 560 is used to stabilize the base voltage of transistor 550. Third capacitor 570 and fourth capacitor 580 are connected in series to form a fourth series branch. One end of the fourth series branch is connected to the collector of transistor 550 and comparison module 601, and the other end of the fourth series branch is grounded. The common end of third capacitor 570 and fourth capacitor 580 is connected to the emitter of transistor 550. Third capacitor 570 and fourth capacitor 580 form an oscillating circuit.

[0060] In an embodiment of the present application, the transistor 550 is an NPN transistor, and its conduction condition refers to that the base voltage is higher than the emitter voltage, and the collector voltage is lower than the base voltage. In an embodiment of the present application, when the transistor 550 is turned on, the third capacitor 570 and the fourth capacitor 580 will be charged. At this time, the emitter voltage and the collector voltage will increase, resulting in the conduction condition of the transistor 550 not being met. At this time, the transistor is cut off, and the third capacitor 570 and the fourth capacitor 580 begin to discharge. The emitter voltage and the collector voltage will decrease until the conduction condition of the transistor 550 is met again. The oscillation circuit composed of the third capacitor 570 and the fourth capacitor 580 and the heating coil in the resonant module that receives the driving oscillation signal form a capacitor three-point oscillation circuit. The oscillation frequency of the capacitor three-point oscillation circuit can be expressed by the following frequency calculation formula:

[0061] Wherein, L is the inductance of the heating coil in the resonant module that receives the driving oscillation signal, C1 is the capacitance of the third capacitor 570 , and C2 is the capacitance of the fourth capacitor 580 .

[0062] According to the above frequency calculation formula, it can be seen that the oscillation frequency of the above-mentioned capacitor three-point oscillation circuit can be determined according to the inductance of the heating coil in the resonance module that receives the driving oscillation signal, the capacitance of the third capacitor 570, and the capacitance of the fourth capacitor 580. Among them, the capacitance of the third capacitor 570 and the capacitance of the fourth capacitor 580 are fixed values, and the inductance of the heating coil in the resonance module that receives the driving oscillation signal needs to be determined according to whether the heating coil is covered with metal cookware.

[0063] When the heating coil is covered with a metal cookware, the equivalent inductance of the heating coil is related to the distance between the metal cookware and the heating coil. Referring to FIG3 , which shows a relationship diagram between the inductance of the heating coil and the distance between the metal cookware and the heating coil provided by one embodiment of the present application, as the distance between the metal cookware and the heating coil increases, the equivalent inductance of the heating coil also gradually increases. As the distance between the metal cookware and the heating coil decreases, the equivalent inductance of the heating coil also decreases. According to the above frequency calculation formula, it can be determined that as the distance between the metal cookware and the heating coil decreases, the oscillation frequency of the capacitor three-point oscillation circuit increases. Referring to curve 1 in part (a) of FIG4 , which shows a waveform diagram of the output of the driving oscillation module when the heating coil is covered with a metal cookware.

[0064] When the heating coil is not covered with a metal cookware, the inductance of the heating coil is a fixed value. With reference to curve 2 in part (a) of Figure 4, it shows the waveform of the output of the driving oscillation module when the heating coil is not covered with a metal cookware. According to the comparison of curve 1 and curve 2, it can be seen that the oscillation period of the above-mentioned capacitor three-point oscillation circuit when the heating coil is not covered with a metal cookware is greater than the oscillation period of the above-mentioned capacitor three-point oscillation circuit when the heating coil is covered with a metal cookware. Therefore, the oscillation frequency of the above-mentioned capacitor three-point oscillation circuit when the heating coil is not covered with a metal cookware is less than the oscillation frequency of the above-mentioned capacitor three-point oscillation circuit when the heating coil is covered with a metal cookware.

[0065] In the embodiment of FIG. 2 , the comparison module 601 includes a first capacitor 610 , a first resistor 620 , a second resistor 630 , a third resistor 640 , a fourth resistor 650 , and a comparator 660 .

[0066] One end of the first capacitor 610 is connected to the oscillation driving module 50. Specifically, the first capacitor 610 is connected to the output end of the oscillation driving module 50, and is used to perform AC coupling on the output signal of the oscillation driving module 50.

[0067] The first resistor 620 and the second resistor 630 are connected in series to form a first series branch, one end of the first series branch is connected to the first specified power supply, the other end of the first series branch is grounded, and the common end of the first resistor 620 and the second resistor 630 is connected to the other end of the first capacitor 610 and the positive input terminal of the comparator 660. The first resistor 620 and the second resistor 630 are used to divide the positive input terminal of the comparator 660. Optionally, the resistance of the first resistor 620 and the second resistor 630 is equal, both 10 kilo-ohms. The first specified power supply can be a +5V low voltage, so that the voltage of the positive input terminal of the comparator 660 is 2.5V.

[0068] The third resistor 640 and the fourth resistor 650 are connected in series to form a second series branch. One end of the second series branch is connected to the first designated power supply, and a second end of the second series branch is grounded. The common end of the third resistor 640 and the fourth resistor 650 is connected to the negative input terminal of the comparator 660. The third resistor 640 and the fourth resistor 650 are used to divide the voltage of the positive input terminal of the comparator 660. Optionally, the resistance of the third resistor 640 and the fourth resistor 650 is equal, both 10 kilo-ohms. The first designated power supply is a +5V low voltage, so that the voltage of the negative input terminal of the comparator 660 is also 2.5V.

[0069] The output terminal of the comparator 660 is connected to the control module 70, and is used to output the comparison result to the control module 70. In this embodiment, the specified voltage is 2.5V.

[0070] In the embodiment of the present application, the voltages at both the positive and negative input terminals of the comparator 660 are 2.5 V. Therefore, when the voltage of the output signal of the driving oscillation module 50 is greater than 2.5 V, the comparator 660 outputs a high level, and when the voltage of the output signal of the driving oscillation module 50 is less than 2.5 V, the comparator 660 outputs a low level. Please refer again to FIG. 4 , where part (b) shows the output waveform of the comparator 660 when the heating coil is not covered with metal cookware, and part (c) shows the output waveform of the comparator 660 when the heating coil is covered with metal cookware. According to the comparison between part (b) and part (c) in Figure 4, it can be seen that the first interval duration is greater than the second interval duration. The first interval duration refers to the interval duration between two adjacent rising edges (i.e., jumping from a low level to a high level) output by the comparator 660 when the heating coil is not covered by the metal cookware; the second interval duration refers to the interval duration between two adjacent rising edges (i.e., jumping from a low level to a high level) output by the comparator 660 when the heating coil is covered by the metal cookware.

[0071] The control module 70 is connected to the inverter module 30, the comparison module 601, and at least two switch modules 20. In the embodiment of FIG2 , the control module 70 is connected to the gates of Q1 and Q2 in the inverter module 30, respectively, for sending drive pulse signals to Q1 and Q2. Optionally, the control module 70 includes at least two first control pins, each corresponding to the at least two switch modules 20. Each first control pin is connected to the first position end 230 of a corresponding switch module 20 and is used to control the active end 220 of the at least two switch modules 20 to contact the first position end 230 or the second position end 240. In the embodiment of FIG2 , the at least two first control pins are R1-Rn. Optionally, the control module 70 includes at least two second control pins, each corresponding to the control end of the selection module 40, for outputting the current conduction selection pin to the selection module 40. In the embodiment of FIG2 , the at least two second control pins are S0, A1, and A2. Optionally, the control module 70 includes an input pin connected to the output end of the comparator 660 for receiving the output result of the comparator 660 .

[0072] In the embodiment of the present application, the control module 70 is configured to control the active end of the first switch module of at least two switch modules 20 to contact the second position end; determine a target resonant module in the resonant module 10 connected to the first switch module, and control the selection module 40 to select and conduct the circuit between the target resonant module and the oscillation drive module 50; obtain the comparison result output by the comparison module 601; determine the oscillation parameters of the target resonant module based on the comparison result, and the oscillation parameters of the target resonant module include the oscillation period and / or oscillation frequency; and detect whether a cookware is placed at the target position corresponding to the target resonant module based on the oscillation parameters of the target resonant module. The implementation details of the cookware detection performed by the control module 70 are described in the method embodiment below.

[0073] In summary, the technical solution provided by the embodiment of the present application is to add an oscillation drive module, a gating module and a comparison module to the electromagnetic heating circuit. The oscillation drive module sends an oscillation drive signal to the target resonance module selected by the gating module for conduction. The comparison module converts the analog signal output by the oscillation drive module into a digital signal. The control module can determine the oscillation parameters (oscillation period or oscillation frequency) of the target resonance module according to the comparison result output by the comparison module, and then perform pot detection based on the above oscillation parameters. Since the resonance module forms a capacitor three-point oscillation circuit with the oscillation drive module under the action of the oscillation drive signal, the oscillation parameters of the capacitor three-point oscillation circuit are determined by the target resonance module. The inductance of the heating coil in the target resonant module and the capacitance of the entire circuit vary, and the inductance of the heating coil in the target resonant module varies with whether a cookware is placed at the target position. Therefore, by detecting the oscillation parameters of the above-mentioned capacitor three-point oscillation circuit, it is possible to determine whether a cookware is placed at the target position. The above-mentioned cookware detection process does not involve the inverter module. On the premise that the inverter module sends a driving pulse signal to other resonant modules other than the target resonant module, it is also possible to detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in the heating state, it is also possible to detect whether a cookware is placed at the position corresponding to other resonant modules that are not in the heating state.

[0074] Please refer to Figure 5, which shows a schematic diagram of an electrical device 500 provided in one embodiment of the present application. The electrical device 500 can be an electromagnetic heating device with multiple heating coils, such as an electromagnetic multi-burner stove. The electrical device 500 includes the electromagnetic heating circuit 100 shown in Figure 1 or Figure 2.

[0075] In some embodiments, the electrical device 500 includes a housing for housing the electromagnetic heating circuit 100. In some embodiments, the housing of the electrical device 500 includes an operation panel connected to the control module. The operation panel includes multiple functional controls, such as a start control, a heating duration adjustment control, a heating power adjustment control, and so on. When the operation panel receives a trigger signal for a functional control, it generates a corresponding electrical signal and sends it to the control module. The control module executes the corresponding control command based on the electrical signal, thereby enabling interaction between the user and the electrical device 500.

[0076] With reference to FIG6 , a flow chart of a method for controlling an electrical device according to an embodiment of the present application is shown. The electrical device includes an electromagnetic heating circuit 100 as shown in FIG1 or FIG2 . The method includes the following process.

[0077] S601 , controlling the movable end of a first switch module among at least two switch modules to contact the second position end.

[0078] The number of the first switch modules may be less than or equal to the number of the switch modules included in the electromagnetic heating circuit.

[0079] In some embodiments, after the electrical device receives a start-up instruction, all switch modules are determined as first switch modules, and the active end of the first switch module is controlled to contact the second position end, thereby conducting the circuit between the resonance module and the selection module connected to the switch module.

[0080] In other embodiments, when some resonant modules in the electromagnetic heating circuit are in a heating state, the electrical device identifies the resonant modules that are not in the heating state as first switch modules and controls the active end of the first switch module to contact the second position end. The active end of the switch module connected to the resonant module in the heating state contacts the first position end to conduct the circuit between the resonant module and the inverter module, and the inverter module sends a drive pulse signal to the resonant module to put the resonant module into the heating state.

[0081] As can be seen from the embodiment shown in FIG2 , the control module includes at least two first control pins (R1 to Rn), with different first control pins connected to the first position terminals of different switch modules. The control module can send control signals to the switch modules connected to the first control pins via the first control pins, instructing the active terminals of the first switch modules to contact the second position terminals, thereby completing the circuit between the resonant modules and the gating modules connected to the respective first switch modules.

[0082] S602 : Determine a target resonant module among the resonant modules connected to the first switch module, and control the gating module to select and conduct a loop between the target resonant module and the oscillation driving module.

[0083] When there is only one first switch module, the electrical device directly determines the resonance module connected to the first switch module as the target resonance module; when there are multiple first switch modules, the electrical device determines the first switch modules as the target resonance modules in sequence according to the arrangement order of the serial numbers of the selection ends of the selection modules.

[0084] As can be seen from the embodiment of Figure 2, the control module includes three second control pins (A0, A1, and A2). The output signals of these three control pins can be used to determine the selection pin that the gating module selects to conduct. The resonant module connected to the first switch module connected to the selection pin is also the target resonant module. Optionally, the relationship between the output signals of the three control pins and the selection pin selected to conduct by the gating module can be seen in Table 1 below.

[0085] Table-1

[0086] After the circuit between the oscillation drive module and the target resonant module is connected, the oscillation drive module is used to send an oscillation drive signal to the target resonant module. The frequency of the oscillation drive signal is set based on experimentation or experience. Optionally, the frequency of the oscillation drive signal is greater than 100 kHz. Optionally, the duration of the oscillation drive signal sending the drive pulse signal to the target resonant module is a preset duration. The preset duration is set based on experimentation or experience. Exemplarily, the preset duration is 10 seconds.

[0087] During the process of the oscillation drive module transmitting the oscillation drive signal to the target resonant module, the comparison module can compare the output voltage of the oscillation drive module with the specified voltage to obtain a comparison result, thereby converting the analog signal output by the oscillation drive module into a digital signal. Optionally, the specified voltage is 2.5V. In some embodiments, the comparison result outputs a high level when the output voltage of the oscillation drive module is greater than the specified voltage, and outputs a low level when the output voltage of the oscillation drive module is less than the specified voltage.

[0088] In addition, it should be noted that in the process of the oscillation drive module sending an oscillation drive signal to the target resonant module, the current flowing through the heating coil in the target resonant module is usually small. Optionally, the ratio between the first current and the second current is greater than a preset ratio. The preset ratio is set based on experiments or experience, for example, the preset ratio is 100. The first current refers to the current flowing through the heating coil in the target resonant module when the inverter module sends a drive pulse signal to the target resonant module; the second current refers to the current flowing through the heating coil in the target resonant module when the oscillation drive module sends an oscillation drive signal to the target resonant module. In this way, the power consumed during the cookware detection process can be reduced, thereby saving the power consumption of electrical equipment.

[0089] S603: Obtain the comparison result output by the comparison module.

[0090] 2 , the control module reads the comparison result output by the comparison module from the v pin.

[0091] S604: Determine the oscillation parameters of the target resonant module based on the comparison result.

[0092] The oscillation parameters of the target resonance module include an oscillation period and / or an oscillation frequency.

[0093] In some embodiments, when the oscillation parameters of the target resonant module include an oscillation period, S604 is implemented as: determining the time interval between two adjacent rising edges in the comparison result as the oscillation period.

[0094] A rising edge refers to the transition of the comparison module's output from a low level to a high level. Referring to Figure 4, when the oscillation drive module's output voltage waveform is Curve 1, the comparison module's output result can be seen in Figure 4 (b), where the oscillation period is T1. When the oscillation drive module's output voltage waveform is Curve 2, the comparison module's output result can be seen in Figure 4 (c), where the oscillation period is T1.

[0095] In some embodiments, when the oscillation parameter of the target resonant module includes an oscillation frequency, S604 is implemented as follows: determining the time interval between two adjacent rising edges in the comparison result as the oscillation period; and determining the oscillation frequency according to the oscillation period.

[0096] The oscillation frequency is the inverse of the oscillation period. Referring to Figure 4, when the waveform of the output voltage of the oscillation drive module is curve 1, the oscillation frequency is 1 / T1; when the waveform of the output voltage of the oscillation drive module is curve 2, the oscillation frequency is 1 / T2.

[0097] S605 : Based on the oscillation parameters of the target resonance module, detecting whether a cookware is placed at a target position corresponding to the target resonance module.

[0098] In some embodiments, when the oscillation parameters of the target resonance module include an oscillation period, S605 is implemented as follows: if the oscillation period is less than a specified duration, it is determined that a pot is placed at the target position; if the oscillation period is greater than or equal to the specified duration, it is determined that no pot is placed at the target position. The specified duration can be pre-set. In some embodiments, the specified duration refers to the oscillation period of the target resonance module when no pot is placed at the target position. In other embodiments, the specified duration refers to the oscillation period of the target resonance module when the distance between the pot and the heating coil is greater than a preset distance.

[0099] In some embodiments, when the oscillation parameters of the target resonance module include an oscillation frequency, S605 is implemented as follows: if the oscillation frequency is greater than a specified frequency, it is determined that a pot is placed at the target position; if the oscillation period is less than or equal to the specified frequency, it is determined that no pot is placed at the target position. The specified frequency can be pre-set. In some embodiments, the specified frequency refers to the oscillation frequency of the target resonance module when no pot is placed at the target position. In other embodiments, the specified frequency refers to the oscillation frequency of the target resonance module when the distance between the pot and the heating coil is greater than a preset distance.

[0100] In summary, the technical solution provided by the embodiment of the present application is to add an oscillation drive module, a gating module and a comparison module to the electromagnetic heating circuit. The oscillation drive module sends an oscillation drive signal to the target resonance module selected by the gating module for conduction. The comparison module converts the analog signal output by the oscillation drive module into a digital signal. The control module can determine the oscillation parameters (oscillation period or oscillation frequency) of the target resonance module according to the comparison result output by the comparison module, and then perform pot detection based on the above oscillation parameters. Since the resonance module forms a capacitor three-point oscillation circuit with the oscillation drive module under the action of the oscillation drive signal, the oscillation parameters of the capacitor three-point oscillation circuit are determined by the target resonance module. The inductance of the heating coil and the capacitance of the entire circuit are determined, and the inductance of the heating coil in the target resonant module changes with whether a cookware is placed at the target position. Therefore, by detecting the oscillation parameters of the above-mentioned capacitor three-point oscillation circuit, it can be determined whether a cookware is placed at the target position. The above-mentioned cookware detection process does not involve the inverter module. On the premise that the inverter module sends a driving pulse signal to other resonant modules other than the target resonant module, it can also detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in the heating state, it can also detect whether a cookware is placed at the position corresponding to other resonant modules that are not in the heating state.

[0101] Please refer to Figure 7, which shows a flow chart of a control method for an electrical device provided by an embodiment of the present application. The electrical device includes an electromagnetic heating circuit 100 as provided in Figure 1 or Figure 2. The method includes the following process.

[0102] S701 , controlling the movable end of a first switch module among at least two switch modules to contact the second position end.

[0103] S702 : Determine a target resonant module among the resonant modules connected to the first switch module, and control the gating module to select and conduct a loop between the target resonant module and the oscillation driving module.

[0104] The oscillation driving module is used to send an oscillation driving signal to the target resonance module.

[0105] S703: Obtain the comparison result output by the comparison module.

[0106] S704: Determine the oscillation parameters of the target resonant module based on the comparison result.

[0107] The oscillation parameters of the target resonance module include an oscillation period and / or an oscillation frequency.

[0108] S705 : Based on the oscillation parameters of the target resonance module, detecting whether a cookware is placed at the target position corresponding to the target resonance module.

[0109] S706 , when it is determined that a cookware is placed at the target position, controlling the active end of the switch module connected to the target resonance module to contact the first position end, so as to conduct the circuit between the target resonance module and the inverter module.

[0110] With reference to the example in FIG2 , the control module sends a control signal to the switch module through the first control pin corresponding to the switch module to which the target resonant module is connected, so that the active end of the switch module contacts the first position end. In this way, the loop between the target resonant module and the inverter module is connected, and the path between the target resonant module and the selection module is disconnected.

[0111] S707: Control the inverter module to send a driving pulse signal to the target resonant module.

[0112] The duty cycle of the driving pulse signal can be determined according to the power requirements of the electrical equipment, and this embodiment of the present application does not limit this.

[0113] In summary, the technical solution provided by the embodiment of the present application is to add an oscillation drive module to the electromagnetic heating circuit. The oscillation drive module transmits an oscillation drive signal to the target resonant module selected for conduction by the oscillation drive module. The comparison module converts the analog signal output by the oscillation drive module into a digital signal. The control module determines the oscillation parameters (oscillation period or oscillation frequency) of the target resonant module based on the comparison result output by the comparison module, and then performs cookware detection based on these oscillation parameters. Because the resonant module, under the action of the oscillation drive signal, forms a capacitive three-point oscillation circuit with the oscillation drive module, the oscillation parameters of this capacitive three-point oscillation circuit are determined by the inductance of the heating coil in the target resonant module and the capacitance of the entire circuit. The inductance of the heating coil in the target resonant module varies depending on whether a cookware is placed at the target location. Therefore, by detecting the oscillation parameters of the capacitive three-point oscillation circuit, it is possible to determine whether a cookware is placed at the target location. This cookware detection process does not involve the inverter module. As long as the inverter module sends drive pulse signals to resonant modules other than the target resonant module, it can also detect whether a cookware is placed at the target location corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in the heating state, it is also possible to detect whether a cookware is placed at the location corresponding to other resonant modules that are not in the heating state.

[0114] Please refer to Figure 8, which shows a block diagram of a control device for an electrical device according to one embodiment of the present application. The electrical device includes the electromagnetic heating circuit shown in Figure 1 or Figure 2, and the device includes: a first control module 810, a second control module 820, a first result acquisition module 830, an oscillation parameter determination module 840, and a first cookware detection module 850.

[0115] The first control module 810 is configured to control the movable end of the first switch module among the at least two switch modules to contact the second position end.

[0116] The second control module 820 is used to determine the target resonant module among the resonant modules connected to the first switch module, and control the selection module to select and conduct the loop between the target resonant module and the oscillation driving module, and the oscillation driving module is used to send an oscillation driving signal to the target resonant module.

[0117] The first result acquisition module 830 is configured to acquire the comparison result output by the comparison module.

[0118] The oscillation parameter determination module 840 is configured to determine the oscillation parameters of the target resonance module based on the comparison result. The oscillation parameters of the target resonance module include an oscillation period and / or an oscillation frequency.

[0119] The first cookware detection module 850 is configured to determine whether a cookware is placed at a target position corresponding to the target resonance module based on the oscillation parameters of the target resonance module.

[0120] In some embodiments, when the oscillation parameters of the target resonance module include an oscillation period, the oscillation parameter determination module 840 is configured to determine the time interval between two adjacent rising edges in the comparison result as the oscillation period. The first pot detection module 850 is configured to determine that a pot is placed at the target location if the oscillation period is less than a specified duration; and to determine that no pot is placed at the target location if the oscillation period is greater than or equal to the specified duration.

[0121] In some embodiments, when the oscillation parameters of the target resonant module include an oscillation frequency, the oscillation parameter determination module 840 is configured to determine the time interval between two adjacent rising edges in the comparison result as the oscillation period, and to determine the oscillation frequency based on the oscillation period. The first pot detection module 850 is configured to determine that a pot is placed at the target location if the oscillation frequency is greater than a specified frequency, and to determine that a pot is not placed at the target location if the oscillation period is less than or equal to the specified frequency.

[0122] In some embodiments, the device includes: a third control module and a fourth control module (not shown). The third control module is configured to, upon determining that a cookware is placed at the target location, control the active end of the switch module connected to the target resonant module to contact the first position end, thereby conducting a circuit between the target resonant module and the inverter module. The fourth control module is configured to control the inverter module to send a drive pulse signal to the target resonant module.

[0123] In some embodiments, the second control module 820 is used to determine the resonance modules connected to the multiple first switch modules as target resonance modules in sequence according to the serial number order of the selection end of the selection module, and control the selection module to select and conduct the loop between the target resonance module and the oscillation driving module.

[0124] In summary, the technical solution provided by the embodiment of the present application is to add an oscillation drive module, a gating module and a comparison module to the electromagnetic heating circuit. The oscillation drive module sends an oscillation drive signal to the target resonance module selected by the gating module for conduction. The comparison module converts the analog signal output by the oscillation drive module into a digital signal. The control module can determine the oscillation parameters (oscillation period or oscillation frequency) of the target resonance module according to the comparison result output by the comparison module, and then perform pot detection based on the above oscillation parameters. Since the resonance module forms a capacitor three-point oscillation circuit with the oscillation drive module under the action of the oscillation drive signal, the oscillation parameters of the capacitor three-point oscillation circuit are determined by the target resonance module. The inductance of the heating coil and the capacitance of the entire circuit are determined, and the inductance of the heating coil in the target resonant module changes with whether a cookware is placed at the target position. Therefore, by detecting the oscillation parameters of the above-mentioned capacitor three-point oscillation circuit, it can be determined whether a cookware is placed at the target position. The above-mentioned cookware detection process does not involve the inverter module. On the premise that the inverter module sends a driving pulse signal to other resonant modules other than the target resonant module, it can also detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in the heating state, it can also detect whether a cookware is placed at the position corresponding to other resonant modules that are not in the heating state.

[0125] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and modules can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0126] In several embodiments provided in this application, the coupling between modules may be electrical, mechanical or other forms of coupling.

[0127] In addition, the functional modules in the various embodiments of the present application may be integrated into a processing module, or each module may exist physically separately, or two or more modules may be integrated into a single module. The above-mentioned integrated modules may be implemented in the form of hardware or software functional modules.

[0128] As shown in FIG9 , the present application example further provides an electrical device 900, which includes the electromagnetic heating circuit 100 as shown in FIG1 or FIG2 . The control module in the electromagnetic heating circuit 100 includes a processor 910, a memory 920, and one or more application programs. The one or more application programs are stored in the memory 920 and configured to be executed by the one or more processors 910, and the one or more application programs are configured to execute the control method of the electrical device as shown in FIG6 or FIG7 .

[0129] The processor 910 may include one or more processing cores. The processor 910 utilizes various interfaces and circuits to connect various components within the battery management system. It executes instructions, programs, code sets, or instruction sets stored in the memory 920, as well as accesses data stored in the memory 920, to perform various functions of the battery management system and process data. Optionally, the processor 910 may be implemented using at least one of the following hardware forms: a digital signal processing (DSP), a field-programmable gate array (FPGA), or a programmable logic array (PLA). The processor 910 may integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. The CPU primarily handles the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing display content; and the modem handles wireless communications. It is understood that the modem may not be integrated into the processor 910 and may be implemented separately via a communication chip.

[0130] The memory 920 may include a random access memory (RAM) or a read-only memory (ROM). The memory 920 may be used to store instructions, programs, codes, code sets, or instruction sets. The memory 920 may include a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playback function, etc.), instructions for implementing the various method examples described below, and the like. The data storage area may also store data created by the electrical device during use.

[0131] Please refer to Figure 10, which shows a structural diagram of an electromagnetic heating circuit 100 provided in another embodiment of the present application. The electromagnetic heating circuit 100 includes at least two resonant modules 10, at least two switch modules 20, an inverter module 30, a gating module 40, an oscillation drive module 50, a voltage signal extraction module 603, and a control module 70.

[0132] The resonance module 10 is used to generate high-frequency resonance, so that the heating coil in the resonance module 10 generates an alternating magnetic field. When the iron-containing container is placed at the position corresponding to the above-mentioned heating coil, the iron-containing container cuts the magnetic lines of force of the alternating magnetic field, thereby generating eddy currents at the bottom of the container. The eddy currents cause the carriers at the bottom of the container to move irregularly at high speed, and the carriers and atoms collide and rub against each other to generate heat energy, thereby playing a heating role.

[0133] The switch module 20 is used to connect or disconnect the circuit between the resonant module 10 and the inverter module 30, and to connect or disconnect the circuit between the resonant module 10 and the gating module 40. When the circuit between the resonant module 10 and the inverter module 30 is connected, the circuit between the resonant module 10 and the gating module 40 is disconnected; when the circuit between the resonant module 10 and the inverter module 30 is disconnected, the circuit between the resonant module 10 and the gating module 40 is connected.

[0134] Each switch module 20 includes a fixed end 210, a movable end 220, a first position end 230, and a second position end 240. At least two switch modules 20 are provided in a one-to-one correspondence with at least two resonant modules 10. The fixed end 210 of each switch module 20 is connected to a corresponding resonant module 10. Therefore, the number of switch modules 20 and resonant modules 10 is the same. The first position end 230 of the switch module 20 is connected to the inverter module 30. When the movable end 220 of the switch module 20 contacts the first position end 230, the circuit between the resonant module 10 connected to the switch module 20 and the inverter module 30 is conductive. The second position end of the switch module 20 is connected to the gating module 40. When the movable end 220 of the switch module 20 contacts the second position end 240, the circuit between the resonant module 10 connected to the switch module 20 and the gating module 40 is conductive.

[0135] The inverter module 30 is used to convert DC power into high-frequency AC power, which is then output as a stable AC power source through a transformer and filter circuit. The gating module 40 is used to select and connect the circuit between a specific resonant module 10 and the oscillation drive module 50. The oscillation drive module 50 is connected to the gating module 40 and is used to send an oscillation drive signal to the resonant module 10 selected by the gating module 40 for connection. The voltage signal module 60 is connected to the oscillation drive module 50 and is used to output the peak voltage signal of the oscillation drive module 50 based on the amplitude of the output signal of the oscillation drive module.

[0136] The control module 70 is connected to the voltage signal extraction module 603, the inverter module 30, the gating module 40, and at least two switch modules 10. The control module 70 is configured to: control the active end of the first switch module of the at least two switch modules 20 to contact the second position end 240; determine the target resonant module in the resonant module 10 connected to the first switch module, and control the gating module 40 to select and conduct the circuit between the target resonant module and the oscillation drive module 50; obtain the output result of the voltage signal extraction module 603, which is the peak voltage signal of the oscillation drive module; and detect whether a pot is placed at the target position corresponding to the target resonant module based on the peak voltage signal of the oscillation drive module 50.

[0137] After the oscillation drive module 50 sends an oscillation drive signal to the target resonant module selected for conduction by the selection module 40, the resonant module, under the action of the oscillation drive signal, forms a capacitive three-point oscillation circuit with the oscillation drive module 50. The equivalent resistance of the heating coil in this capacitive three-point oscillation circuit varies depending on whether it is covered by metal cookware. When the equivalent resistance of the heating coil changes, the amplitude of the oscillation waveform output by the oscillation drive module 50 changes, and the peak voltage signal determined based on the amplitude of the oscillation waveform also changes accordingly. Therefore, based on the peak voltage signal of the oscillation drive module 50, it can be determined whether the heating coil is covered by cookware. The above-mentioned cookware detection process does not involve the inverter module 30. Under the premise that the inverter module 30 sends a drive pulse signal to other resonant modules 10 other than the target resonant module, it can also detect whether a cookware is placed at the target position corresponding to the target resonant module. In other words, the electromagnetic heating circuit provided in the embodiment of the present application can detect whether a cookware is placed at the position corresponding to other resonant modules 10 that are not in the heating state even when some resonant modules 10 in the electromagnetic heating circuit 100 are in the heating state.

[0138] In some embodiments, the electromagnetic heating circuit 100 further includes an AC power supply module 80 and a rectifier and filter module 90. The AC power supply module 80 is configured to provide AC power to the electromagnetic heating circuit 100. The rectifier and filter module 90 is configured to convert the AC power signal output by the AC power supply module 80 into a DC power signal and filter out high-frequency noise in the DC power signal, thereby making the output power signal more stable. The AC power supply module 80 is connected to the input end of the rectifier and filter module 90, and the output end of the rectifier and filter module 90 is connected to the inverter module 30.

[0139] In summary, the electromagnetic heating circuit provided in the embodiment of the present application adds an oscillation drive module, a gating module and a voltage signal extraction module to the electromagnetic heating circuit. The oscillation drive module sends an oscillation drive signal to the target resonance module selected for conduction by the gating module. The voltage signal extraction module can output the peak voltage signal of the oscillation drive module based on the amplitude of the output signal of the oscillation drive module. The control module can detect whether a pot is placed at the target position based on the peak voltage signal of the oscillation drive module. Since the resonance module forms a capacitor three-point oscillation circuit with the oscillation drive module under the action of the oscillation drive signal, the equivalent resistance of the heating coil in the capacitor three-point oscillation circuit increases with the change of the target position. When the equivalent resistance of the heating coil changes depending on whether a cookware is placed, the amplitude of the oscillation waveform output by the oscillation driving module changes accordingly, and the peak voltage signal determined based on the amplitude of the output signal of the oscillation driving module also changes accordingly. Therefore, cookware detection can be performed based on the above-mentioned peak voltage signal. The above-mentioned cookware detection process does not involve the inverter module. On the premise that the inverter module sends a driving pulse signal to other resonant modules other than the target resonant module, it can also detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in the heating state, it can also detect whether a cookware is placed at the position corresponding to other resonant modules that are not in the heating state.

[0140] The various modules involved in the electromagnetic heating circuit 100 provided in FIG10 are described below in conjunction with FIG11. FIG11 shows a circuit diagram of the electromagnetic heating circuit 100 provided in another embodiment of the present application.

[0141] The resonant module 10 includes a heating coil 110 and at least one resonant capacitor 120. The heating coil 110 is used to generate an alternating magnetic field during resonance. When a ferrous container is placed in the corresponding position of the heating coil, the ferrous container cuts the magnetic lines of force of the alternating magnetic field, generating eddy currents at the bottom of the container. The eddy currents cause carriers at the bottom of the container to move at high speed and irregularly. The carriers collide and rub against atoms, generating heat energy, thereby providing heating. The resonant capacitor 120 is used to adjust the resonant frequency, helping the resonant module 10 achieve strong feedback and enhance oscillations in the circuit. In the embodiment of FIG11 , the resonant module 10 includes one heating coil 110 and two resonant capacitors 120 (a first resonant capacitor C11 and a second resonant capacitor C12). The first resonant capacitor C11 and the second resonant capacitor C12 are connected in series to form a series branch. One end of the series branch is connected to the first end of the inverter module 30, and the other end of the series branch is connected to the second end of the inverter module 30. The first end of the heating coil 110 is connected to the common end of the first resonant capacitor C11 and the second resonant capacitor C12.

[0142] In the embodiment of Figure 11, the switch module 20 is a single-pole double-throw switch, the fixed end 210 of the switch module 20 is connected to the second end of the heating coil 11, the first position end 230 of the switch module 20 is connected to the inverter module 30, and the second position end 240 of the switch module 20 is connected to the selection module 40.

[0143] The inverter module 30 is used to convert DC power into AC power with constant frequency and voltage or frequency and voltage regulation. The inverter module 30 can be a half-bridge inverter circuit, a full-bridge inverter circuit, or a single-tube inverter circuit. The embodiment of the present application does not limit its implementation form. In the embodiment of Figure 11, the inverter module 30 is a half-bridge inverter circuit composed of a first insulated gate bipolar transistor (IGBT) Q1 and a second insulated gate bipolar transistor Q2. The collector of Q1 is connected to the rectifier and filter module 80 and one end of the series branch (the series branch formed by the first resonant capacitor C11 and the second resonant capacitor C12 in series), the emitter of Q2 is connected to the collector of Q2, the emitter of Q2 is connected to the rectifier and filter module 80 and the other end of the series branch, and the gates of Q1 and Q2 are respectively connected to the control module 70.

[0144] The gating switch 40 is a multiple-to-one analog switch. The gating switch 40 includes a common terminal, multiple select terminals, and a control terminal. The common terminal of the gating switch 40 is connected to the output terminal of the oscillation drive module 50. At least two select terminals are provided in a one-to-one correspondence with at least two switch modules 20, each select terminal being connected to the second position terminal 240 of a corresponding switch module 20. The number of select terminals can be greater than or equal to the number of switch modules 210. If the number of select terminals is greater than the number of switch modules 20, some select terminals will be unconnected. The control terminal is connected to the control module 70. The number of control terminals is determined by the number of select terminals. For example, if there are 8 select terminals, the number of control terminals is 3; for another example, if there are 16 select terminals, the number of control terminals is 4. In the embodiment of FIG11 , the gating switch 40 is an eight-to-one analog switch, comprising 8 select pins (i.e., select terminals), namely Y0 to Y7; 3 control pins (i.e., control terminals), namely S0, A1, and A2; and a common pin z (i.e., a common terminal).

[0145] In the embodiment of FIG. 11 , the oscillation driving module 50 includes a fifth resistor 510 , a sixth resistor 520 , a seventh resistor 530 , an eighth resistor 540 , a transistor 550 , a second capacitor 560 , a third capacitor 570 , and a fourth capacitor 580 .

[0146] The fifth resistor 510 and the sixth resistor 520 are connected in series to form a third series branch. One end of the third series branch is connected to the second designated power source, and the other end of the third series branch is grounded. The common end of the fifth resistor 510 and the sixth resistor 520 is connected to the base of the transistor 550. The fifth resistor 510 and the sixth resistor 520 are used to provide a divided voltage for the base of the transistor 550. The second designated power source can be a +5V low voltage, so that the base voltage of the transistor 550 is 2.5V.

[0147] One end of the seventh resistor 530 is connected to the second designated power source, and the other end of the seventh resistor 530 is connected to the collector of the transistor 550. The seventh resistor 530 is used to divide the voltage of the collector of the transistor 550.

[0148] One end of the eighth resistor 540 is connected to the emitter of the transistor 550 , and the other end is grounded. The eighth resistor 540 is used to divide the voltage of the emitter of the transistor 550 .

[0149] One end of the second capacitor 560 is connected to the base of the transistor 550, and the other end is grounded. The second capacitor 560 is used to stabilize the base voltage of the transistor 550. The third capacitor 570 and the fourth capacitor 580 are connected in series to form a fourth series branch. One end of the fourth series branch is connected to the collector of the transistor 550 and the voltage signal extraction module 603, and the other end of the fourth series branch is grounded. The common end of the third capacitor 570 and the fourth capacitor 580 is connected to the emitter of the transistor 550. The third capacitor 570 and the fourth capacitor 580 form an oscillation circuit.

[0150] In an embodiment of the present application, the transistor 550 is an NPN transistor, and its conduction condition refers to that the base voltage is higher than the emitter voltage and the collector voltage is lower than the base voltage. In an embodiment of the present application, when the transistor 550 is turned on, the third capacitor 570 and the fourth capacitor 580 will be charged. At this time, the emitter voltage and the collector voltage will increase, resulting in the conduction condition of the transistor 550 not being met. At this time, the transistor is cut off, and the third capacitor 570 and the fourth capacitor 580 begin to discharge. The emitter voltage and the collector voltage will decrease until the conduction condition of the transistor 550 is met again. The oscillation circuit composed of the third capacitor 570 and the fourth capacitor 580 and the heating coil in the resonant module that receives the driving oscillation signal form a capacitor three-point oscillation circuit.

[0151] When the heating coil is covered with a metal cookware, the equivalent resistance of the heating coil is related to the distance between the metal cookware and the heating coil. With reference to Figure 12, a relationship diagram showing the equivalent resistance (Rs) of the heating coil provided by an embodiment of the present application and the distance (D) between the metal cookware and the heating coil is shown. As the distance between the metal cookware and the heating coil increases, the equivalent resistance of the heating coil gradually decreases. As the distance between the metal cookware and the heating coil decreases, the equivalent resistance of the heating coil also increases. The increase in the equivalent resistance of the heating coil indicates that the loss of the above-mentioned capacitor three-point oscillation circuit increases, and at this time, the amplitude of the oscillation waveform output by the oscillation drive module 50 decreases. On the contrary, the equivalent resistance of the heating coil decreases, indicating that the loss of the above-mentioned capacitor three-point oscillation circuit decreases, and at this time, the amplitude of the oscillation waveform output by the oscillation drive module 50 increases.

[0152] The voltage signal extraction module 603 is configured to output a peak voltage signal of the oscillation driving module 50 based on the amplitude of the output signal of the oscillation driving module 50. Specifically, the voltage signal extraction module 603 is configured to convert the amplitude of the analog signal output by the oscillation driving module 50 into a stable and smooth DC voltage signal, i.e., the peak voltage signal.

[0153] In the embodiment of Figure 11, the voltage signal extraction module 603 includes a diode 670, a fifth capacitor 680, and a ninth capacitor 690. The anode of the diode 670 is connected to the oscillation drive module 50. Optionally, the conduction voltage drop of the diode 670 is 0V. The fifth capacitor 680 and the ninth capacitor 690 are connected in parallel to each other to form a parallel loop, one end of the parallel loop is grounded, and the other end is connected to the cathode of the diode 670 and the control module 70. The fifth capacitor 680 is used to stabilize the voltage of the output signal of the voltage signal extraction module 603. Optionally, the capacitance value of the fifth capacitor 680 is 0.1 microfarads. The ninth capacitor 690 is a discharge resistor, and its resistance value is usually large, such as 100kΩ.

[0154] Combined with reference to Figure 13, it shows a waveform diagram of the oscillation waveform output by the oscillation drive module 50. Among them, time t1 is the moment when the voltage of the oscillation waveform output by the oscillation drive module 50 reaches its maximum value when the heating coil in the target resonance module is not covered by the metal cookware. At this time, the output voltage of the oscillation drive module 50 (that is, the W1 voltage) has a peak value of 3.5V, and the conduction voltage drop of the diode is 0V. If the voltage at the output end of the voltage signal extraction module 603 (that is, the V1 voltage) is less than 3.5V, the diode 670 is turned on, and the voltage at the output end of the voltage signal extraction module 603 is raised to 3.5V. Due to the energy storage effect of the fifth capacitor 680, the resistance value of the ninth capacitor 690 is relatively large, so the voltage at the output end of the voltage signal extraction module 603 remains unchanged for a period of time; time t3 is the moment when the heating coil in the target resonance module is covered by the metal cookware. When the pot is covered, the oscillation waveform output by the oscillation drive module 50 reaches its maximum voltage. At this time, the output voltage of the oscillation drive module 50 (i.e., voltage W3) is less than voltage W1. If the voltage at the output of the voltage signal extraction module 603 (i.e., voltage V3) is higher than 3V, the voltage at the output of the voltage signal extraction module 603 is discharged to 3V by the ninth capacitor 690. If the voltage at the output of the voltage signal extraction module 603 is lower than 3V, the diode 670 is turned on, raising the voltage at the output of the voltage signal extraction module 603 to 3V. Due to the energy storage function of the fifth capacitor 680, the resistance of the ninth capacitor 690 is relatively large, so the voltage at the output of the voltage signal extraction module 603 remains unchanged for a period of time. As can be seen from FIG. 13 , by reasonably determining the specified voltage threshold, the control module 70 can perform pot detection based on the magnitude relationship between the voltage at the output of the voltage signal extraction module 603 and the specified voltage threshold.

[0155] The control module 70 is connected to the inverter module 30, the voltage signal extraction module 603, and at least two switch modules 20. In the embodiment of FIG11 , the control module 70 is connected to the gates of Q1 and Q2 in the inverter module 30, respectively, for sending drive pulse signals to Q1 and Q2. Optionally, the control module 70 includes at least two first control pins, each corresponding to the at least two switch modules 20. Each first control pin is connected to the first position end 230 of a corresponding switch module 20 and is used to control the active end 220 of the at least two switch modules 20 to contact the first position end 230 or the second position end 240. In the embodiment of FIG11 , the at least two first control pins are R1-Rn. Optionally, the control module 70 includes at least two second control pins, each corresponding to the control end of the gating module 40, for outputting a selection pin for the current conduction to the gating module 40. In the embodiment of FIG11 , the at least two second control pins are S0, A1, and A2. Optionally, the control module 70 includes an input pin connected to the output end of the comparator 660 for receiving the cathode of the diode 670 .

[0156] In this embodiment of the present application, the control module 70 is configured to control the active end of the first switch module of at least two switch modules 20 to contact the second position end; determine a target resonant module in the resonant module 10 connected to the first switch module, and control the selection module 40 to select and conduct the circuit between the target resonant module and the oscillation drive module 50; obtain the output result of the voltage signal extraction module 603, which is the peak voltage signal of the oscillation drive module 50; and based on the peak voltage signal of the oscillation drive module 50, detect whether a cookware is placed at the target position corresponding to the target resonant module. The implementation details of the cookware detection performed by the control module 70 are described in the method embodiments below.

[0157] In summary, the technical solution provided by the embodiment of the present application adds an oscillation drive module, a gating module and a voltage signal extraction module to the electromagnetic heating circuit. The oscillation drive module sends an oscillation drive signal to the target resonance module selected for conduction by the gating module. The voltage signal extraction module can output the peak voltage signal of the oscillation drive module based on the amplitude of the output signal of the oscillation drive module. The control module can detect whether a pot is placed at the target position based on the peak voltage signal of the oscillation drive module. Since the resonance module forms a capacitor three-point oscillation circuit with the oscillation drive module under the action of the oscillation drive signal, the equivalent resistance of the heating coil in the capacitor three-point oscillation circuit increases as the target position is The voltage at which a cookware is placed changes depending on whether a cookware is placed therein. When the equivalent resistance of the heating coil changes, the amplitude of the oscillation waveform output by the oscillation driving module changes accordingly. The peak voltage signal determined based on the amplitude of the output signal of the oscillation driving module also changes accordingly. Therefore, cookware detection can be performed based on the above-mentioned peak voltage signal. The above-mentioned cookware detection process does not involve the inverter module. On the premise that the inverter module sends a driving pulse signal to other resonant modules other than the target resonant module, it can also detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in a heating state, it can also detect whether a cookware is placed at the position corresponding to other resonant modules that are not in a heating state.

[0158] Please refer to Figure 14, which shows a schematic diagram of an electrical device 1400 provided in another embodiment of the present application. The electrical device 1400 can be an electromagnetic heating device with multiple heating coils, such as an electromagnetic multi-burner stove. The electrical device 1400 includes the electromagnetic heating circuit 100 shown in Figure 10 or Figure 11.

[0159] In some embodiments, the electrical device 1400 includes a housing for housing the electromagnetic heating circuit 100. In some embodiments, the housing of the electrical device 1400 includes an operation panel connected to the control module. The operation panel includes multiple functional controls, such as a start control, a heating duration adjustment control, a heating power adjustment control, and so on. When the operation panel receives a trigger signal for a functional control, it generates a corresponding electrical signal and sends it to the control module. The control module executes the corresponding control command based on the electrical signal, thereby enabling interaction between the user and the electrical device 1400.

[0160] With reference to FIG15 , a flow chart of a control method for an electrical device according to another embodiment of the present application is shown. The electrical device includes an electromagnetic heating circuit 100 as shown in FIG10 or FIG11 . The method includes the following process.

[0161] S1501, controlling the movable end of a first switch module among at least two switch modules to contact the second position end.

[0162] The number of the first switch modules may be less than or equal to the number of the switch modules included in the electromagnetic heating circuit.

[0163] In some embodiments, after the electrical device receives a start-up instruction, all switch modules are determined as first switch modules, and the active end of the first switch module is controlled to contact the second position end, thereby conducting the circuit between the resonance module and the selection module connected to the switch module.

[0164] In other embodiments, when some resonant modules in the electromagnetic heating circuit are in a heating state, the electrical device identifies the resonant modules that are not in the heating state as first switch modules and controls the active end of the first switch module to contact the second position end. The active end of the switch module connected to the resonant module in the heating state contacts the first position end to conduct the circuit between the resonant module and the inverter module, and the inverter module sends a drive pulse signal to the resonant module to put the resonant module into the heating state.

[0165] As can be seen from the embodiment shown in FIG11 , the control module includes at least two first control pins (R1 to Rn), with different first control pins connected to the first position terminals of different switch modules. The control module can send control signals via the first control pins to the switch modules connected thereto, instructing the active terminals of the first switch modules to contact the second position terminals, thereby completing the circuit between the resonant modules and the gating modules connected to the respective first switch modules.

[0166] S1502 , determining a target resonant module among the resonant modules connected to the first switch module, and controlling the gating module to select and conduct a loop between the target resonant module and the oscillation driving module.

[0167] When there is only one first switch module, the electrical device directly determines the resonance module connected to the first switch module as the target resonance module; when there are multiple first switch modules, the electrical device determines the first switch modules as the target resonance modules in sequence according to the arrangement order of the serial numbers of the selection ends of the selection modules.

[0168] As can be seen from the embodiment of Figure 11, the control module includes three second control pins (A0, A1, and A2). The output signals of these three control pins can be used to determine the selection pin that the gating module selects to conduct. The resonant module connected to the first switch module connected to the selection pin is also the target resonant module. Optionally, the relationship between the output signals of the three control pins and the selection pin selected to conduct by the gating module can be seen in Table 2 below.

[0169] Table-2

[0170] After the circuit between the oscillation drive module and the target resonant module is connected, the oscillation drive module is used to send an oscillation drive signal to the target resonant module. The frequency of the oscillation drive signal is set based on experimentation or experience. Optionally, the frequency of the oscillation drive signal is greater than 100 kHz. Optionally, the duration of the oscillation drive signal sending the drive pulse signal to the target resonant module is a preset duration. The preset duration is set based on experimentation or experience. Exemplarily, the preset duration is 10 seconds.

[0171] During the process of the oscillation driving module sending an oscillation driving signal to the target resonant module, the voltage signal extraction module can convert the amplitude of the oscillation waveform output by the oscillation driving module into a stable and smooth DC voltage signal, that is, based on the amplitude of the output signal of the oscillation driving module, output the peak voltage signal of the oscillation driving module.

[0172] In addition, it should be noted that in the process of the oscillation drive module sending an oscillation drive signal to the target resonant module, the current flowing through the heating coil in the target resonant module is usually small. Optionally, the ratio between the first current and the second current is greater than a preset ratio. The preset ratio is set based on experiments or experience, for example, the preset ratio is 100. The first current refers to the current flowing through the heating coil in the target resonant module when the inverter module sends a drive pulse signal to the target resonant module; the second current refers to the current flowing through the heating coil in the target resonant module when the oscillation drive module sends an oscillation drive signal to the target resonant module. In this way, the power consumed during the cookware detection process can be reduced, thereby saving the power consumption of electrical equipment.

[0173] S1503: Obtain the output result of the voltage signal extraction module.

[0174] The output result is the peak voltage signal of the oscillation driving module. In conjunction with the embodiment of FIG11 , the control module reads the output result of the voltage signal extraction module from the V pin.

[0175] S1504: Based on the peak voltage signal of the oscillation driving module, detect whether a cookware is placed at the target position corresponding to the target resonance module.

[0176] In some embodiments, the control module determines the peak voltage of the oscillation drive module based on the peak voltage signal; when the peak voltage of the oscillation drive module is less than a specified voltage threshold, it is determined that a pot is placed at the target position; when the output voltage of the oscillation drive module is greater than or equal to the specified voltage threshold, it is determined that no pot is placed at the target position.

[0177] Optionally, the control module performs ADC conversion on the peak voltage signal output by the voltage signal extraction module to obtain the peak voltage of the oscillation drive module. The specified voltage threshold is set based on experiments or experience. Exemplarily, the specified voltage threshold is 3.2V. Please refer to Figure 13 again. At time t1, the peak voltage determined based on the peak voltage signal output by the voltage signal extraction module is 3.5V, which is greater than the above-mentioned specified voltage threshold. Therefore, at time t1, no pot is placed at the target position; at time t3, the peak voltage determined based on the peak voltage signal output by the voltage signal extraction module is 3V, which is less than the above-mentioned specified voltage threshold. Therefore, at time t3, a pot is placed at the target position.

[0178] After the oscillation driving module sends an oscillation driving signal to the target resonance module selected for conduction by the selection module, the resonance module forms a capacitor three-point oscillation circuit with the oscillation driving module under the action of the oscillation driving signal. The equivalent resistance of the heating coil in the capacitor three-point oscillation circuit changes depending on whether it is covered with metal cookware. When the equivalent resistance of the heating coil changes, the amplitude of the oscillation waveform output by the oscillation driving module changes, and the peak voltage signal determined based on the amplitude of the above oscillation waveform also changes accordingly. Therefore, based on the peak voltage signal of the oscillation driving module 50, it can be determined whether the above heating coil is covered with cookware.

[0179] In some embodiments, when the control module determines that the heating coil is covered by a cookware, the control module sets the value of the cookware flag corresponding to the coil to a first value; when the heating coil is not covered by the cookware, the control module sets the value of the cookware flag corresponding to the coil to a second value. The first value and the second value are set based on experiments or experience, for example, the first value is 1 and the second value is 0.

[0180] In summary, the technical solution provided by the embodiment of the present application is to add an oscillation drive module, a gating module and a voltage signal extraction module to the electromagnetic heating circuit. The oscillation drive module sends an oscillation drive signal to the target resonance module selected by the gating module for conduction. The voltage signal extraction module can output the peak voltage signal of the oscillation drive module based on the amplitude of the output signal of the oscillation drive module. The control module can detect whether a pot is placed at the target position based on the peak voltage signal of the oscillation drive module. Since the resonance module forms a capacitor three-point oscillation circuit with the oscillation drive module under the action of the oscillation drive signal, the equivalent resistance of the heating coil in the capacitor three-point oscillation circuit changes with whether the target position is When the equivalent resistance of the heating coil changes due to the placement of the cookware, the amplitude of the oscillation waveform output by the oscillation driving module changes accordingly, and the peak voltage signal determined based on the amplitude of the output signal of the oscillation driving module also changes accordingly. Therefore, cookware detection can be performed based on the above-mentioned peak voltage signal. The above-mentioned cookware detection process does not involve the inverter module. On the premise that the inverter module sends a driving pulse signal to other resonant modules other than the target resonant module, it can also detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in the heating state, it can also detect whether a cookware is placed at the position corresponding to other resonant modules that are not in the heating state.

[0181] Please refer to Figure 16, which shows a flow chart of a control method for an electrical device provided in one embodiment of the present application. The electrical device includes an electromagnetic heating circuit 100 as provided in Figure 10 or Figure 11. The method includes the following process.

[0182] S1601, controlling the movable end of a first switch module among at least two switch modules to contact the second position end.

[0183] S1602: Determine a target resonant module among the resonant modules connected to the first switch module, and control the gating module to select and conduct a loop between the target resonant module and the oscillation driving module.

[0184] The oscillation driving module is used to send an oscillation driving signal to the target resonance module.

[0185] S1603: Obtain the output result of the voltage signal extraction module.

[0186] The output result is the peak voltage signal of the oscillation drive module.

[0187] S1604: Based on the peak voltage signal of the oscillation driving module, detect whether a cookware is placed at the target position corresponding to the target resonance module.

[0188] S1605 , when it is determined that a cookware is placed at the target position, controlling the active end of the switch module connected to the target resonance module to contact the first position end, so as to conduct the circuit between the target resonance module and the inverter module.

[0189] With reference to the example in FIG11 , the control module sends a control signal to the switch module through the first control pin corresponding to the switch module to which the target resonant module is connected, so that the active end of the switch module contacts the first position end. In this way, the loop between the target resonant module and the inverter module is connected, and the path between the target resonant module and the selection module is disconnected.

[0190] S1606: Control the inverter module to send a driving pulse signal to the target resonant module.

[0191] The duty cycle of the driving pulse signal can be determined according to the power requirements of the electrical equipment, and this embodiment of the present application does not limit this.

[0192] In summary, the technical solution provided by the embodiment of the present application is to add an oscillation drive module, a gating module and a voltage signal extraction module to the electromagnetic heating circuit. The oscillation drive module sends an oscillation drive signal to the target resonance module selected by the gating module for conduction. The voltage signal extraction module can output the peak voltage signal of the oscillation drive module based on the amplitude of the output signal of the oscillation drive module. The control module can detect whether a pot is placed at the target position based on the peak voltage signal of the oscillation drive module. Since the resonance module forms a capacitor three-point oscillation circuit with the oscillation drive module under the action of the oscillation drive signal, the equivalent resistance of the heating coil in the capacitor three-point oscillation circuit changes with whether the target position is When the equivalent resistance of the heating coil changes due to the placement of the cookware, the amplitude of the oscillation waveform output by the oscillation driving module changes accordingly, and the peak voltage signal determined based on the amplitude of the output signal of the oscillation driving module also changes accordingly. Therefore, cookware detection can be performed based on the above-mentioned peak voltage signal. The above-mentioned cookware detection process does not involve the inverter module. On the premise that the inverter module sends a driving pulse signal to other resonant modules other than the target resonant module, it can also detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in the heating state, it can also detect whether a cookware is placed at the position corresponding to other resonant modules that are not in the heating state.

[0193] Please refer to Figure 17, which shows a block diagram of a control device for an electrical device according to one embodiment of the present application. The electrical device includes the electromagnetic heating circuit shown in Figure 10 or Figure 11, and includes: a first control module 810, a second control module 820, a second result acquisition module 860, and a second pot detection module 870.

[0194] The first control module 810 is configured to control the movable end of the first switch module among the at least two switch modules to contact the second position end.

[0195] The second control module 820 is used to determine the target resonant module among the resonant modules connected to the first switch module, and control the selection module to select and conduct the loop between the target resonant module and the oscillation driving module, and the oscillation driving module is used to send an oscillation driving signal to the target resonant module.

[0196] The second result acquisition module 860 is used to obtain the output result of the voltage signal extraction module, where the output result is the peak voltage signal of the oscillation driving module.

[0197] The second cookware detection module 870 is configured to detect whether a cookware is placed at a target position corresponding to a target resonance module based on a peak voltage signal of the oscillation driving module.

[0198] In some embodiments, the second pot detection module 870 is used to determine the peak voltage of the oscillation drive module based on the peak voltage signal; when the peak voltage of the oscillation drive module is less than a specified voltage threshold, it is determined that a pot is placed at the target position; when the output voltage of the oscillation drive module is greater than or equal to the specified voltage threshold, it is determined that no pot is placed at the target position.

[0199] In some embodiments, the device includes: a third control module and a fourth control module (not shown). The third control module is configured to, upon determining that a cookware is placed at the target location, control the active end of the switch module connected to the target resonant module to contact the first position end, thereby conducting a circuit between the target resonant module and the inverter module. The fourth control module is configured to control the inverter module to send a drive pulse signal to the target resonant module.

[0200] In some embodiments, the second control module 820 is configured to determine the resonant modules connected to the plurality of first switch modules as target resonant modules in sequence according to the sequence of the selection terminals of the gating module, and control the gating module to select and conduct the loop between the target resonant module and the oscillation driving module.

[0201] In summary, the technical solution provided by the embodiment of the present application is to add an oscillation drive module, a gating module and a voltage signal extraction module to the electromagnetic heating circuit. The oscillation drive module sends an oscillation drive signal to the target resonance module selected by the gating module for conduction. The voltage signal extraction module can output the peak voltage signal of the oscillation drive module based on the amplitude of the output signal of the oscillation drive module. The control module can detect whether a pot is placed at the target position based on the peak voltage signal of the oscillation drive module. Since the resonance module forms a capacitor three-point oscillation circuit with the oscillation drive module under the action of the oscillation drive signal, the equivalent resistance of the heating coil in the capacitor three-point oscillation circuit changes with whether the target position is When the equivalent resistance of the heating coil changes due to the placement of the cookware, the amplitude of the oscillation waveform output by the oscillation driving module changes accordingly, and the peak voltage signal determined based on the amplitude of the output signal of the oscillation driving module also changes accordingly. Therefore, cookware detection can be performed based on the above-mentioned peak voltage signal. The above-mentioned cookware detection process does not involve the inverter module. On the premise that the inverter module sends a driving pulse signal to other resonant modules other than the target resonant module, it can also detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in the heating state, it can also detect whether a cookware is placed at the position corresponding to other resonant modules that are not in the heating state.

[0202] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and modules can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0203] In several embodiments provided in this application, the coupling between modules may be electrical, mechanical or other forms of coupling.

[0204] In addition, the functional modules in the various embodiments of the present application may be integrated into a processing module, or each module may exist physically separately, or two or more modules may be integrated into a single module. The above-mentioned integrated modules may be implemented in the form of hardware or software functional modules.

[0205] As shown in FIG18 , the present application example further provides an electrical device 1800, which includes the electromagnetic heating circuit 100 as shown in FIG10 or FIG11 . The control module in the electromagnetic heating circuit 100 includes a processor 1810, a memory 1820, and one or more application programs. The one or more application programs are stored in the memory 1820 and configured to be executed by the one or more processors 1810, and the one or more application programs are configured to execute the control method of the electrical device as shown in FIG15 or FIG16 .

[0206] The processor 1810 may include one or more processing cores. The processor 1810 utilizes various interfaces and circuits to connect various components within the battery management system. It executes instructions, programs, code sets, or instruction sets stored in the memory 1820, as well as accesses data stored in the memory 1820, to perform various functions of the battery management system and process data. Optionally, the processor 1810 may be implemented using at least one of the following hardware forms: a digital signal processing (DSP), a field-programmable gate array (FPGA), or a programmable logic array (PLA). The processor 1810 may integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. The CPU primarily handles the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing display content; and the modem handles wireless communications. It is understood that the modem may not be integrated into the processor 1810 and may be implemented separately via a communication chip.

[0207] The memory 1820 may include a random access memory (RAM) or a read-only memory (ROM). The memory 1820 may be used to store instructions, programs, codes, code sets, or instruction sets. The memory 1820 may include a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playback function, etc.), instructions for implementing the various method examples described below, and the like. The data storage area may also store data created by the electrical device during use.

[0208] Please refer to Figure 19, which shows a structural diagram of an electromagnetic heating circuit 100 provided in another embodiment of the present application. The electromagnetic heating circuit 100 includes at least two resonant modules 10, at least two switch modules 20, an inverter module 30, a gating module 40, an oscillation drive module 50, a voltage processing module 60, and a control module 70.

[0209] The resonance module 10 is used to generate high-frequency resonance, so that the heating coil in the resonance module 10 generates an alternating magnetic field. When the iron-containing container is placed at the position corresponding to the above-mentioned heating coil, the iron-containing container cuts the magnetic lines of force of the alternating magnetic field, thereby generating eddy currents at the bottom of the container. The eddy currents cause the carriers at the bottom of the container to move irregularly at high speed, and the carriers and atoms collide and rub against each other to generate heat energy, thereby playing a heating role.

[0210] The switch module 20 is used to connect or disconnect the circuit between the resonant module 10 and the inverter module 30, and to connect or disconnect the circuit between the resonant module 10 and the gating module 40. When the circuit between the resonant module 10 and the inverter module 30 is connected, the circuit between the resonant module 10 and the gating module 40 is disconnected; when the circuit between the resonant module 10 and the inverter module 30 is disconnected, the circuit between the resonant module 10 and the gating module 40 is connected.

[0211] Each switch module 20 includes a fixed end 210, a movable end 220, a first position end 230, and a second position end 240. At least two switch modules 20 are provided in a one-to-one correspondence with at least two resonant modules 10. The fixed end 210 of each switch module 20 is connected to a corresponding resonant module 10. Therefore, the number of switch modules 20 and resonant modules 10 is the same. The first position end 230 of the switch module 20 is connected to the inverter module 30. When the movable end 220 of the switch module 20 contacts the first position end 230, the circuit between the resonant module 10 connected to the switch module 20 and the inverter module 30 is conductive. The second position end of the switch module 20 is connected to the gating module 40. When the movable end 220 of the switch module 20 contacts the second position end 240, the circuit between the resonant module 10 connected to the switch module 20 and the gating module 40 is conductive.

[0212] The inverter module 30 is used to convert DC power into high-frequency AC power, which is then output as a stable AC power supply through a transformer and filter circuit. The gating module 40 is used to select and connect the circuit between a resonant module 10 and the oscillator drive module 50. The oscillation drive module 50 is connected to the gating module 40 and is used to send an oscillation drive signal to the resonant module 10 selected by the gating module 40 for connection. The voltage processing module 60 is connected to the oscillation drive module 50 and is configured to process the output voltage of the oscillation drive module 50 to obtain a voltage processing result.

[0213] The control module 70 is connected to the inverter module 30, the voltage processing module 60, the gating module 40, and at least two switch modules 10. The control module 70 is configured to: determine the target resonant module, control the gating module 40 to select and conduct the circuit between the target resonant module and the oscillation drive module 50, obtain the voltage processing result output by the voltage processing module 60, and detect whether a cookware is placed at the target position corresponding to the target resonant module.

[0214] After the oscillation driving module 50 sends an oscillation driving signal to the target resonant module selected for conduction by the gating module 40 , the resonant module forms a capacitor three-point oscillation circuit with the oscillation driving module 50 under the action of the oscillation driving signal.

[0215] On the one hand, the oscillation frequency of the capacitor three-point oscillation circuit is determined by the inductance of the heating coil in the target resonance module and the capacitance of the entire circuit. The inductance of the heating coil in the target resonance module changes with whether the pot is placed at the target position. Therefore, by detecting the oscillation frequency of the above-mentioned capacitor three-point oscillation circuit, it can be determined whether the pot is placed at the target position.

[0216] On the other hand, the equivalent resistance of the heating coil in the capacitor three-point oscillation circuit changes depending on whether it is covered with metal cookware. When the equivalent resistance of the heating coil changes, the amplitude of the oscillation waveform output by the oscillation drive module 50 changes, and the peak voltage signal determined based on the amplitude of the above oscillation waveform also changes accordingly. Therefore, based on the peak voltage signal of the oscillation drive module 50, it can be determined whether the above heating coil is covered with cookware.

[0217] The above-mentioned cookware detection process does not involve the inverter module 30. On the premise that the inverter module 30 sends a driving pulse signal to other resonant modules 10 other than the target resonant module, it can also detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, the electromagnetic heating circuit provided in the embodiment of the present application can detect whether a cookware is placed at the position corresponding to other resonant modules 10 that are not in the heating state even when some resonant modules 10 in the electromagnetic heating circuit 100 are in the heating state.

[0218] In some embodiments, the electromagnetic heating circuit 100 further includes an AC power supply module 80 and a rectifier and filter module 90. The AC power supply module 80 is configured to provide AC power to the electromagnetic heating circuit 100. The rectifier and filter module 90 is configured to convert the AC power signal output by the AC power supply module 80 into a DC power signal and filter out high-frequency noise in the DC power signal, thereby making the output power signal more stable. The AC power supply module 80 is connected to the input end of the rectifier and filter module 90, and the output end of the rectifier and filter module 90 is connected to the inverter module 30.

[0219] In some possible embodiments, the voltage processing module 60 may include a comparison module 601, which is connected to the oscillation drive module 50 and configured to compare the output voltage of the oscillation drive module 50 with a specified voltage to obtain a comparison result. The control module 70 is connected to the comparison module 601; the control module 70 is specifically configured to obtain the comparison result output by the comparison module 601; determine the oscillation parameters of the target resonant module based on the comparison result, where the oscillation parameters of the target resonant module include an oscillation period and / or an oscillation frequency; and detect whether a cookware is placed at the target position corresponding to the target resonant module based on the oscillation parameters of the target resonant module.

[0220] Therefore, in the electromagnetic heating circuit provided in the embodiment of the present application, an oscillation driving module, a gating module and a comparison module are additionally provided in the electromagnetic heating circuit. The oscillation driving module sends an oscillation driving signal to the target resonance module selected for conduction by the gating module. The comparison module converts the analog signal output by the oscillation driving module into a digital signal. The control module can determine the oscillation parameters (oscillation period or oscillation frequency) of the target resonance module according to the comparison result output by the comparison module, and then perform pot detection according to the above oscillation parameters. Since the resonance module forms a capacitor three-point oscillation circuit with the oscillation driving module under the action of the oscillation driving signal, the oscillation parameters of the capacitor three-point oscillation circuit are determined by the target resonance module. The inductance of the heating coil in the target resonant module and the capacitance of the entire circuit are determined, and the inductance of the heating coil in the target resonant module changes with whether a cookware is placed at the target position. Therefore, by detecting the oscillation parameters of the above-mentioned capacitor three-point oscillation circuit, it is possible to determine whether a cookware is placed at the target position. The above-mentioned cookware detection process does not involve the inverter module. On the premise that the inverter module sends a driving pulse signal to other resonant modules other than the target resonant module, it is also possible to detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in the heating state, it is also possible to detect whether a cookware is placed at the position corresponding to other resonant modules that are not in the heating state.

[0221] Specifically, the comparison module 601 may have one or more combinations of the multiple features of the comparison module 601 provided in any of the above embodiments. The specific implementation method can refer to the relevant introduction in the above embodiments and will not be repeated here.

[0222] In some other possible embodiments, the voltage processing module 60 may include a voltage signal extraction module 603, which is connected to the oscillation driving module 50; the voltage signal extraction module 603 is configured to: output a peak voltage signal of the oscillation driving module 50 based on the amplitude of the output signal of the oscillation driving module 50;

[0223] The control module 70 is connected to the voltage signal extraction module 603; the control module 70 is specifically configured to: obtain the output result of the voltage signal extraction module 603, the output result is the peak voltage signal of the oscillation drive module; based on the peak voltage signal of the oscillation drive module, detect whether a pot is placed at the target position corresponding to the target resonance module.

[0224] Therefore, in the electromagnetic heating circuit provided in the embodiment of the present application, an oscillation driving module, a gating module and a voltage signal extraction module are additionally provided in the electromagnetic heating circuit. The oscillation driving module sends an oscillation driving signal to the target resonance module selected for conduction by the gating module. The voltage signal extraction module can output the peak voltage signal of the oscillation driving module based on the amplitude of the output signal of the oscillation driving module. The control module can detect whether a pot is placed at the target position based on the peak voltage signal of the oscillation driving module. Since the resonance module forms a capacitor three-point oscillation circuit with the oscillation driving module under the action of the oscillation driving signal, the equivalent resistance of the heating coil in the capacitor three-point oscillation circuit increases with the change of the target position. When the equivalent resistance of the heating coil changes depending on whether a cookware is placed, the amplitude of the oscillation waveform output by the oscillation driving module changes accordingly, and the peak voltage signal determined based on the amplitude of the output signal of the oscillation driving module also changes accordingly. Therefore, cookware detection can be performed based on the above-mentioned peak voltage signal. The above-mentioned cookware detection process does not involve the inverter module. On the premise that the inverter module sends a driving pulse signal to other resonant modules other than the target resonant module, it can also detect whether a cookware is placed at the target position corresponding to the target resonant module. That is, when some resonant modules in the electromagnetic heating circuit are in the heating state, it can also detect whether a cookware is placed at the position corresponding to other resonant modules that are not in the heating state.

[0225] Specifically, the voltage signal extraction module 603 may have one or more combinations of the multiple features of the voltage signal extraction module 603 provided in any of the above embodiments. The specific implementation method can refer to the relevant introduction in the above embodiments and will not be repeated here.

[0226] It should be noted here that, in the absence of conflict, the features of the resonance module 10, the switch module 20, the inverter module 30, the gating module 40, the oscillation drive module 50 and the control module 70 in the above embodiments can be combined into this embodiment. To save space, they will not be described one by one here.

[0227] Please refer to Figure 20, which shows that an embodiment of the present application also provides a computer-readable storage medium 2000, in which computer program instructions 2010 are stored. The computer program instructions 2010 can be called by a processor to execute the method described in the above embodiment.

[0228] Computer-readable storage medium 2000 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read-Only Memory), EPROM, hard disk, or ROM. Alternatively, computer-readable storage medium 1000 may comprise a non-transitory computer-readable storage medium. Computer-readable storage medium 2000 has storage space for computer program instructions 2010 for executing any of the method steps described above. These computer program instructions 2010 may be read from or written to one or more computer program products. Computer program instructions 2010 may be compressed in a suitable format.

[0229] The above are merely preferred examples of the present application and do not constitute any form of limitation to the present application. Although the present application has been disclosed as a preferred example, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to equivalent examples using the technical content disclosed above without departing from the scope of the technical solution of the present application. However, any brief modifications, equivalent changes and modifications made to the above examples based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. An electromagnetic heating circuit, characterized in that: include: at least two resonant modules; At least two switch modules, each of which comprises a fixed end, a movable end, a first position end, and a second position end; At least two of the switch modules and at least two of the resonance modules are arranged in one-to-one correspondence, and a fixed end of each of the switch modules is connected to the corresponding resonance module; An inverter module connected to the first position end; A gating module connected to the second position end; An oscillation driving module connected to the gating module; the oscillation driving module is configured to: send an oscillation driving signal to a target resonance module among the at least two resonance modules; A voltage processing module is connected to the oscillation driving module; the voltage processing module is configured to: process the output voltage of the oscillation driving module to obtain a voltage processing result; as well as A control module is connected to the inverter module, the voltage processing module, the gating module and at least two of the switch modules; the control module is configured to: determine the target resonance module, and control the gating module to select and conduct the loop between the target resonance module and the oscillation drive module; obtain the voltage processing result output by the voltage processing module, and detect whether a pot is placed at the target position corresponding to the target resonance module.

2. The circuit according to claim 1, characterized in that The voltage processing module includes a comparison module, the comparison module is connected to the oscillation driving module, and the comparison module is configured to: compare the magnitude relationship between the output voltage of the oscillation driving module and the specified voltage to obtain a comparison result; The control module is connected to the comparison module; the control module is specifically configured to: obtain a comparison result output by the comparison module; determine an oscillation parameter of the target resonance module based on the comparison result, the oscillation parameter of the target resonance module including an oscillation period and / or an oscillation frequency; based on the oscillation parameter of the target resonance module, detect whether a pot is placed at a target position corresponding to the target resonance module.

3. The circuit according to claim 2, characterized in that The comparison module includes a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor and a comparator; One end of the first capacitor is connected to the oscillation driving module; The first resistor and the second resistor are connected in series to form a first series branch. One end of the first series branch is connected to a first designated power supply, the other end of the first series branch is grounded, and a common end of the first resistor and the second resistor is connected to the other end of the first capacitor and the positive input end of the comparator; The third resistor and the fourth resistor are connected in series to form a second series branch, one end of the second series branch is connected to the first designated power supply, a second end of the second series branch is grounded, and a common end of the third resistor and the fourth resistor is connected to the negative input end of the comparator; The output end of the comparator is connected to the control module.

4. The circuit according to claim 1, characterized in that The voltage processing module includes a voltage signal extraction module, and the voltage signal extraction module is connected to the oscillation driving module; the voltage signal extraction module is configured to: output a peak voltage signal of the oscillation driving module based on the amplitude of the output signal of the oscillation driving module; The control module is connected to the voltage signal extraction module; the control module is specifically configured to: obtain the output result of the voltage signal extraction module, the output result is the peak voltage signal of the oscillation driving module; based on the peak voltage signal of the oscillation driving module, detect whether a pot is placed at the target position corresponding to the target resonance module.

5. The circuit according to claim 4, characterized in that The voltage signal extraction module includes a diode, a fifth capacitor, and a ninth resistor; The anode of the diode is connected to the oscillation driving module; The fifth capacitor and the ninth resistor are connected in parallel to form a parallel loop, one end of the parallel loop is grounded, and the other end is connected to the cathode of the diode and the control module.

6. The circuit according to any one of claims 1 to 5, characterized in that The oscillation driving module includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a triode, a second capacitor, a third capacitor, and a fourth capacitor; The fifth resistor and the sixth resistor are connected in series to form a third series branch, one end of the third series branch is connected to the second specified power supply, and the other end of the third series branch is grounded; the common end of the fifth resistor and the sixth resistor is connected to the base of the transistor; One end of the seventh resistor is connected to the second designated power supply, and the other end of the seventh resistor is connected to the collector of the transistor; One end of the eighth resistor is connected to the emitter of the transistor, and the other end is grounded; One end of the second capacitor is connected to the base of the transistor, and the other end is grounded; The third capacitor and the fourth capacitor are connected in series to form a fourth series branch, one end of the fourth series branch is connected to the collector of the transistor and the comparison module, the other end of the fourth series branch is grounded, and the common end of the third capacitor and the fourth capacitor is connected to the emitter of the transistor.

7. The circuit according to any one of claims 1 to 6, characterized in that The gating module includes a selection control terminal, at least two selection terminals, and a common terminal; The selection control terminal is connected to the control module; At least two of the selection terminals and at least two switch modules are arranged in one-to-one correspondence, and each selection terminal is connected to the second position terminal of the corresponding switch module; The common end is connected to the oscillation driving module.

8. An electromagnetic heating circuit, characterized in that: include: at least two resonant modules; At least two switch modules, each of which comprises a fixed end, a movable end, a first position end, and a second position end; At least two of the switch modules and at least two of the resonance modules are arranged in one-to-one correspondence, and a fixed end of each of the switch modules is connected to the corresponding resonance module; An inverter module connected to the first position end; A gating module connected to the second position end; An oscillation driving module connected to the gating module; the oscillation driving module is configured to: send an oscillation driving signal to a target resonance module among the at least two resonance modules; A comparison module, connected to the oscillation driving module; The comparison module is configured to: compare the output voltage of the oscillation driving module with the specified voltage to obtain a comparison result; as well as A control module is connected to the inverter module, the comparison module, the gating module and at least two of the switch modules; the control module is configured to: control the active end of the first switch module of the at least two switch modules to contact the second position end; determine the target resonance module in the resonance module connected to the first switch module, and control the gating module to select and conduct the loop between the target resonance module and the oscillation drive module; obtain the comparison result output by the comparison module; determine the oscillation parameters of the target resonance module based on the comparison result, and the oscillation parameters of the target resonance module include an oscillation period and / or an oscillation frequency; Based on the oscillation parameter of the target resonance module, it is detected whether a cooker is placed at a target position corresponding to the target resonance module.

9. The circuit according to claim 8, characterized in that The comparison module includes a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor and a comparator; One end of the first capacitor is connected to the oscillation driving module; The first resistor and the second resistor are connected in series to form a first series branch, one end of the first series branch is connected to a first specified power supply, the other end of the first series branch is grounded, and a common end of the first resistor and the second resistor is connected to the other end of the first capacitor and the positive input end of the comparator; The third resistor and the fourth resistor are connected in series to form a second series branch, one end of the second series branch is connected to the first designated power supply, a second end of the second series branch is grounded, and a common end of the third resistor and the fourth resistor is connected to the negative input end of the comparator; The output end of the comparator is connected to the control module.

10. The circuit according to claim 8 or 9, characterized in that The oscillation driving module includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a triode, a second capacitor, a third capacitor, and a fourth capacitor; The fifth resistor and the sixth resistor are connected in series to form a third series branch, one end of the third series branch is connected to the second specified power supply, and the other end of the third series branch is grounded; the common end of the fifth resistor and the sixth resistor is connected to the base of the transistor; One end of the seventh resistor is connected to the second designated power supply, and the other end of the seventh resistor is connected to the collector of the transistor; One end of the eighth resistor is connected to the emitter of the transistor, and the other end is grounded; One end of the second capacitor is connected to the base of the transistor, and the other end is grounded; The third capacitor and the fourth capacitor are connected in series to form a fourth series branch, one end of the fourth series branch is connected to the collector of the transistor and the comparison module, the other end of the fourth series branch is grounded, and the common end of the third capacitor and the fourth capacitor is connected to the emitter of the transistor.

11. The circuit according to any one of claims 8 to 10, characterized in that The gating module includes a selection control terminal, at least two selection terminals, and a common terminal; The selection control terminal is connected to the control module; At least two of the selection terminals and at least two switch modules are arranged in one-to-one correspondence, and each selection terminal is connected to the second position terminal of the corresponding switch module; The common end is connected to the oscillation driving module.

12. A control method for an electrical device, characterized in that: The electrical device comprises the electromagnetic heating circuit according to any one of claims 8 to 11, and the method comprises: Controlling the movable end of the first switch module among at least two of the switch modules to contact with the second position end; Determine a target resonance module among the resonance modules connected to the first switch module, and control the gating module to select and conduct a loop between the target resonance module and the oscillation driving module; the oscillation driving module is used to send the oscillation driving signal to the target resonance module; Obtaining a comparison result output by the comparison module; Determine an oscillation parameter of the target resonance module based on the comparison result, where the oscillation parameter of the target resonance module includes an oscillation period and / or an oscillation frequency; Based on the oscillation parameter of the target resonance module, it is detected whether a cooker is placed at a target position corresponding to the target resonance module.

13. The method according to claim 12, characterized in that In a case where the oscillation parameter of the target resonance module includes the oscillation period, determining the oscillation parameter of the target resonance module based on the comparison result includes: Determining the time interval between two adjacent rising edges in the comparison result as the oscillation period; The detecting, based on the oscillation parameter of the target resonance module, whether a cooker is placed at a target position corresponding to the target resonance module comprises: If the oscillation period is less than the specified time length, it is determined that a pot is placed at the target position; If the oscillation period is greater than or equal to the specified time length, it is determined that no pot is placed at the target position.

14. The method according to claim 12 or 13, characterized in that In a case where the oscillation parameter of the target resonance module includes the oscillation frequency, determining the oscillation parameter of the target resonance module based on the comparison result includes: Determining the time interval between two adjacent rising edges in the comparison result as the oscillation period; determining the oscillation frequency according to the oscillation period; The detecting, based on the oscillation parameter of the target resonance module, whether a cooker is placed at a target position corresponding to the target resonance module comprises: If the oscillation frequency is greater than a specified frequency, it is determined that a pot is placed at the target position; If the oscillation period is less than or equal to the specified frequency, it is determined that no pot is placed at the target position.

15. The method according to any one of claims 12 to 14, characterized in that After detecting whether a cooker is placed at a target position corresponding to the target resonance module based on the oscillation parameter of the target resonance module, the method further includes: When it is determined that a pot is placed at the target position, controlling the active end of the switch module connected to the target resonance module to contact the first position end to conduct the loop between the target resonance module and the inverter module; The inverter module is controlled to send a driving pulse signal to the target resonance module.

16. The method according to any one of claims 12 to 15, characterized in that In the case that there are multiple first switch modules, determining a target resonance module among the resonance modules connected to the first switch module, and controlling the gating module to select and conduct a loop between the target resonance module and the oscillation driving module, includes: According to the sequence number of the selection end of the gating module, the resonance modules respectively connected to the plurality of the first switch modules are determined as the target resonance modules in turn, and the gating module is controlled to select and conduct the loop between the target resonance module and the oscillation driving module.

17. A control device for an electrical device, characterized in that: The electrical equipment comprises the electromagnetic heating circuit according to any one of claims 8 to 11, and the device comprises: A first control module, used for controlling the movable end of a first switch module among at least two switch modules to contact with the second position end; a second control module, configured to determine a target resonance module among the resonance modules connected to the first switch module, and control the gating module to select and conduct a loop between the target resonance module and the oscillation driving module, wherein the oscillation driving module is configured to send an oscillation driving signal to the target resonance module; A first result acquisition module, used to acquire the comparison result output by the comparison module; an oscillation parameter determination module, configured to determine the oscillation parameter of the target resonance module based on the comparison result, The oscillation parameters of the target resonance module include an oscillation period and / or an oscillation frequency; The first pot detection module is used to detect whether a pot is placed at a target position corresponding to the target resonance module based on the oscillation parameter of the target resonance module.

18. An electrical device, characterized in that: The electrical device comprises an electromagnetic heating circuit as claimed in any one of claims 8 to 11; The control module in the electromagnetic heating circuit includes one or more processors; Memory; One or more applications, wherein one or more of the applications are stored in the memory and configured to be executed by one or more of the processors, and one or more of the applications are configured to execute the method according to any one of claims 12 to 16.

19. An electromagnetic heating circuit, characterized in that: include: at least two resonant modules; At least two switch modules, each of which comprises a fixed end, a movable end, a first position end, and a second position end; At least two of the switch modules and at least two of the resonance modules are arranged in one-to-one correspondence, and a fixed end of each of the switch modules is connected to the corresponding resonance module; An inverter module connected to the first position end; A gating module connected to the second position end; An oscillation driving module connected to the gating module; the oscillation driving module is configured to: send an oscillation driving signal to a target resonance module among the at least two resonance modules; A voltage signal extraction module is connected to the oscillation driving module; the voltage signal extraction module is configured to: output a peak voltage signal of the oscillation driving module based on the amplitude of the output signal of the oscillation driving module; as well as A control module is connected to the inverter module, the voltage signal extraction module, the gating module and at least two of the switch modules; the control module is configured to: control the active end of the first switch module among the at least two switch modules to contact the second position end; determine the target resonance module in the resonance module connected to the first switch module, and control the gating module to select and conduct the loop between the target resonance module and the oscillation drive module; obtain the output result of the voltage signal extraction module, the output result is the peak voltage signal of the oscillation drive module; Based on the peak voltage signal of the oscillation driving module, detecting Whether a cooker is placed at the target position corresponding to the target resonance module.

20. The circuit according to claim 19, characterized in that The voltage signal extraction module includes a diode, a fifth capacitor, and a ninth resistor; The anode of the diode is connected to the oscillation driving module; The fifth capacitor and the ninth resistor are connected in parallel to form a parallel loop, one end of the parallel loop is grounded, and the other end is connected to the cathode of the diode and the control module.

21. The circuit according to claim 19 or 20, characterized in that The oscillation driving module includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a triode, a second capacitor, a third capacitor, and a fourth capacitor; The fifth resistor and the sixth resistor are connected in series to form a third series branch, one end of the third series branch is connected to the second specified power supply, and the other end of the third series branch is grounded; the common end of the fifth resistor and the sixth resistor is connected to the base of the transistor; One end of the seventh resistor is connected to the second designated power supply, and the other end of the seventh resistor is connected to the collector of the transistor; One end of the eighth resistor is connected to the emitter of the transistor, and the other end is grounded; One end of the second capacitor is connected to the base of the transistor, and the other end is grounded; The third capacitor and the fourth capacitor are connected in series to form a fourth series branch, one end of the fourth series branch is connected to the collector of the transistor and the voltage signal extraction module, the other end of the fourth series branch is grounded, and the common end of the third capacitor and the fourth capacitor is connected to the emitter of the transistor.

22. The circuit according to any one of claims 19 to 21, characterized in that The gating module includes a selection control terminal, at least two selection terminals, and a common terminal; The selection control terminal is connected to the control module; At least two of the selection terminals and at least two switch modules are arranged in one-to-one correspondence, and each selection terminal is connected to the second position terminal of the corresponding switch module; The common end is connected to the oscillation driving module.

23. A control method for an electrical device, characterized in that: The electrical device comprises the electromagnetic heating circuit as claimed in any one of claims 19 to 22, and the method comprises: Controlling the movable end of the first switch module among at least two of the switch modules to contact with the second position end; Determine a target resonance module among the resonance modules connected to the first switch module, and control the gating module to select and conduct a loop between the target resonance module and the oscillation driving module; the oscillation driving module is used to send the oscillation driving signal to the target resonance module; Acquire an output result of the voltage signal extraction module, wherein the output result is a peak voltage signal output by the oscillation driving module; Based on the peak voltage signal of the oscillation driving module, it is detected whether a cooker is placed at a target position corresponding to the target resonance module.

24. The method according to claim 23, characterized in that The detecting, based on the peak voltage signal of the oscillation driving module, whether a cooker is placed at a target position corresponding to the target resonance module comprises: Determining a peak voltage of the oscillation driving module based on the peak voltage signal; When the peak voltage of the oscillation driving module is less than a specified voltage threshold, determining that a pot is placed at the target position; When the output voltage of the oscillation driving module is greater than or equal to the specified voltage threshold, it is determined that no pot is placed at the target position.

25. The method according to claim 23 or 24, characterized in that After detecting whether a cooker is placed at the target position corresponding to the target resonance module based on the peak voltage signal of the oscillation driving module, the method further includes: When it is determined that a pot is placed at the target position, controlling the active end of the switch module connected to the target resonance module to contact the first position end to conduct the loop between the target resonance module and the inverter module; The inverter module is controlled to send a driving pulse signal to the target resonance module.

26. The method according to any one of claims 23 to 25, characterized in that In the case that there are multiple first switch modules, determining a target resonance module among the resonance modules connected to the first switch module, and controlling the gating module to select and conduct a loop between the target resonance module and the oscillation driving module, includes: According to the sequence number of the selection end of the gating module, the resonance modules respectively connected to the plurality of the first switch modules are determined as the target resonance modules in turn, and the gating module is controlled to select and conduct the loop between the target resonance module and the oscillation driving module.

27. A control device for an electrical device, characterized in that: The electrical device comprises an electromagnetic heating circuit as claimed in any one of claims 19 to 22, and the device comprises: A first control module, used for controlling the movable end of a first switch module among at least two switch modules to contact with the second position end; a second control module, configured to determine a target resonance module among the resonance modules connected to the first switch module, and control the gating module to select and conduct a loop between the target resonance module and the oscillation driving module, wherein the oscillation driving module is configured to send an oscillation driving signal to the target resonance module; A second result acquisition module, used to acquire an output result of the voltage signal extraction module, wherein the output result is a peak voltage signal of the oscillation driving module; The second pot detection module is used to detect whether a pot is placed at a target position corresponding to the target resonance module based on the peak voltage signal of the oscillation driving module.

28. An electrical device, characterized in that: The electrical device comprises an electromagnetic heating circuit as claimed in any one of claims 19 to 22; The control module in the electromagnetic heating circuit includes one or more processors; Memory; One or more applications, wherein one or more of the applications are stored in the memory and configured to be executed by one or more of the processors, and one or more of the applications are configured to execute the method as claimed in any one of claims 23 to 26.

29. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program code, and the program code is called by a processor to execute the method according to any one of claims 12 to 16 and 23 to 26.

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