Electromagnetic heating circuit, control method and device of electric appliance, and electric appliance

Abstract

The application discloses an electromagnetic heating circuit, a control method and device of an electrical appliance, and the electrical appliance. The circuit comprises at least two resonance modules, at least two switch modules, an inverter module, a gating module, an oscillation driving module, a voltage signal extraction module, and a control module. The switch module comprises a fixed end, a movable end, a first position end, and a second position end. The fixed end of the at least two switch modules is connected to the at least two resonance modules one by one. The inverter module is connected to the first position end. The gating module is connected to the second position end. The oscillation driving module is connected to the gating module. The voltage signal extraction module is connected to the oscillation driving module. The control module is connected to the inverter module, the voltage signal extraction module, the gating module, and the at least two switch modules. The technical scheme provided by the embodiment of the application can detect whether a pot is placed at a position corresponding to a resonance module not in a heating state when part of the resonance modules in the electromagnetic heating circuit are in the heating state.

Description

Technical Field

[0001] This application relates to the field of electrical technology, and in particular to an electromagnetic heating circuit, a control method and apparatus for electrical equipment, and electrical equipment. Background Technology

[0002] 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.

[0003] Electromagnetic heating devices typically start heating the coils after detecting that a pot is covering them. The specific method for detecting pots in electromagnetic heating devices is as follows: The device sends a control signal to connect each heating coil to the inverter module, which then outputs one or more cycles of detection signals to acquire the current signal characteristics flowing through each heating coil. This allows the device to detect whether a pot is covering each coil. If so, the connection between the coil and the inverter module is maintained, and the inverter module sends a drive pulse signal to the heating coil to initiate heating. If no pot is covering the coil, the connection is disconnected from the inverter module.

[0004] However, for the heating coils that are disconnected from the inverter module, the electromagnetic heating device cannot detect whether they are covered with 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 cookware on the heating coils that have not started heating. Summary of the Invention

[0005] This application proposes an electromagnetic heating circuit, a control method for electrical equipment, a device, and electrical equipment.

[0006] In a first aspect, embodiments of this application provide an electromagnetic heating circuit, the circuit comprising: at least two resonant modules; at least two switching modules, each switching module including a fixed terminal, a movable terminal, a first position terminal, and a second position terminal; the fixed terminals of the at least two switching modules being connected one-to-one with the at least two resonant modules; an inverter module connected to the first position terminal; a gating module connected to the second position terminal; an oscillation driving module connected to the gating module; the oscillation driving module being configured to: send an oscillation driving signal to a target resonant module among the at least two resonant modules; and a voltage signal extraction module connected to the oscillation driving module; the voltage signal extraction module being configured to: extract a voltage signal based on the output of the oscillation driving module. The signal amplitude output is the peak voltage signal of the oscillation drive module; the control module is connected to the inverter module, the voltage signal extraction module, the gating module, and at least two switching modules; the control module is configured to: control the active end of the first switching module in the at least two switching modules to contact the second position end; determine the target resonant module in the resonant modules connected to the first switching module, and control the gating module to select and conduct the circuit between the target resonant module and the oscillation drive module; obtain the output result of the voltage signal extraction module, the output result being 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.

[0007] Secondly, embodiments of this application provide a control method for an electrical device, applied to an electromagnetic heating circuit as described in the first aspect. The method includes: controlling the active end of a first switching module in at least two switching modules to contact a second position end; determining a target resonant module among the resonant modules connected to the first switching module, and controlling a selection module to select and connect the circuit between the target resonant module and the oscillation driving module; the oscillation driving module sending an oscillation driving signal to the target resonant module; acquiring the output result of a voltage signal extraction module, the output result being the peak voltage signal output by the oscillation driving module; and detecting whether a pot is placed at the target position corresponding to the target resonant module based on the peak voltage signal of the oscillation driving module.

[0008] Thirdly, embodiments of this application provide a control device for an electrical appliance, applied to an electromagnetic heating circuit as described in the first aspect. The device includes: a first control module for controlling the active end of at least two switching modules to contact a second position end; a second control module for determining a target resonant module among the resonant modules connected to the first switching module, and controlling a selection module to select and conduct the circuit between the target resonant module and the oscillation driving module, wherein the oscillation driving module is used to send an oscillation driving signal to the target resonant module; a result acquisition module for acquiring the output result of a voltage signal extraction module, wherein the output result is the peak voltage signal of the oscillation driving module; and a cookware detection module for detecting whether a cookware is placed at the target position corresponding to the target resonant module based on the peak voltage signal of the oscillation driving module.

[0009] Fourthly, embodiments of this application provide an electrical device, which includes an electromagnetic heating circuit as described in the first aspect; the control module in the electromagnetic heating circuit includes one or more processors; a memory; and one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the one or more processors, and the one or more application programs are configured to perform the method as described in the second aspect.

[0010] Fifthly, embodiments of this application provide a computer-readable storage medium storing program code, which is invoked by a processor to execute the method as described in the second aspect.

[0011] In a sixth aspect, embodiments of this application provide a computer program product that, when executed, is used to implement the method as described in the second aspect.

[0012] Compared to existing technologies, the technical solution provided in this 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 resonant module selected 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 resonant module and the oscillation drive module form a three-point capacitive oscillation circuit under the action of the oscillation drive signal, the equivalent resistance of the heating coil in this three-point capacitive oscillation circuit varies with the target position. Whether or not a pot is placed changes. When the equivalent resistance of the heating coil changes, the amplitude of the oscillation waveform output by the oscillation drive module changes accordingly. The peak voltage signal determined based on the amplitude of the output signal of the oscillation drive module also changes accordingly. Therefore, the pot can be detected based on the above peak voltage signal. The above pot detection process does not involve the inverter module. Under the premise that the inverter module sends drive pulse signals to other resonant modules besides the target resonant module, it can also detect whether a pot 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 pot is placed at the position corresponding to other resonant modules that are not in the heating state. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1This is a structural diagram of an electromagnetic heating circuit provided in one embodiment of this application.

[0015] Figure 2 This is a circuit diagram of an electromagnetic heating circuit provided in one embodiment of this application.

[0016] Figure 3 This is a diagram showing the relationship between the equivalent resistance of the heating coil and the distance between the heating coil and the metal cookware, provided in one embodiment of this application.

[0017] Figure 4 This is a waveform diagram of the oscillation waveform output by the oscillation drive module and a schematic diagram of the peak voltage signal extracted by the voltage signal extraction module according to an embodiment of this application.

[0018] Figure 5 This is a schematic diagram of an electrical device provided in one embodiment of this application.

[0019] Figure 6 This is a flowchart of a control method for an electrical device provided in one embodiment of this application.

[0020] Figure 7 This is a flowchart of a control method for an electrical device provided in another embodiment of this application.

[0021] Figure 8 This is a block diagram of a control device for an electrical appliance provided in one embodiment of this application.

[0022] Figure 9 This is a structural block diagram of an electrical device provided in one embodiment of this application.

[0023] Figure 10 This is a structural block diagram of a computer-readable storage medium provided in one embodiment of this application. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0025] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] Please refer to Figure 1 The diagram shows a structural diagram of an electromagnetic heating circuit 100 provided in one embodiment of this application. The electromagnetic heating circuit 100 includes at least two resonant modules 10, at least two switching modules 20, an inverter module 30, a gating module 40, an oscillation drive module 50, a voltage signal extraction module 60, and a control module 70.

[0027] The resonant module 10 is used to generate high-frequency resonance, thereby causing the heating coil in the resonant module 10 to generate an alternating magnetic field. When the iron-containing container is placed at the position corresponding to the heating coil, the iron-containing container cuts the magnetic field lines of the alternating magnetic field, thereby generating eddy currents at the bottom of the container. The eddy currents cause the charge carriers at the bottom of the container to move at high speed and randomly. The charge carriers collide and rub against each other with the atoms to generate heat energy, thereby playing a heating role.

[0028] The switching 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. Specifically, 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.

[0029] Each switch module 20 includes a fixed terminal 210, a movable terminal 220, a first position terminal 230, and a second position terminal 240. The fixed terminals 210 of at least two switch modules 20 are connected one-to-one to at least two resonant modules 10; therefore, the number of switch modules 20 and resonant modules 10 is the same. The first position terminal 230 of the switch module 20 is connected to the inverter module 30. When the movable terminal 220 of the switch module 20 contacts the first position terminal 230, the circuit between the resonant module 10 connected to the switch module 20 and the inverter module 30 is connected. The second position terminal of the switch module 20 is connected to the selection module 40. When the movable terminal 220 of the switch module 20 contacts the second position terminal 240, the circuit between the resonant module 10 connected to the switch module 20 and the selection module 40 is connected.

[0030] Inverter module 30 converts DC power into high-frequency AC power, which, after passing through a transformer and filter circuit, outputs a stable AC power supply. Gating module 40 selects and activates the circuit between a specific resonant module 10 and oscillation drive module 50. Oscillation drive module 50 is connected to gating module 40 and sends an oscillation drive signal to the selected resonant module 10. Voltage signal module 60, connected to oscillation drive module 50, outputs the peak voltage signal of oscillation drive module 50 based on the amplitude of the output signal of the oscillation drive module.

[0031] A control module 70 is connected to a voltage signal extraction module 60, an inverter module 30, and at least two switching modules 20. The control module 70 is configured to: control the active terminal of a first switching module among the at least two switching modules 20 to contact a second position terminal 240; identify a target resonant module among the resonant modules 10 connected to the first switching module, and control a selection module 40 to select and connect the circuit between the target resonant module and the oscillation drive module 50; acquire the output result of the voltage signal extraction module 60, the output result being 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.

[0032] After the oscillation drive module 50 sends an oscillation drive signal to the target resonant module selected by the gating module 40, the resonant module forms a capacitive three-point oscillation circuit with the oscillation drive module 50 under the action of the oscillation drive signal. The equivalent resistance of the heating coil in the capacitive three-point oscillation circuit changes depending on whether it is covered by a metal pot. When the equivalent resistance of the heating coil changes, the amplitude of the oscillation waveform output by the oscillation drive module 50 changes. 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 a pot. The pot 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 pot is placed at the target position corresponding to the target resonant module. That is, the electromagnetic heating circuit provided in this application embodiment can detect whether a pot is placed at the position corresponding to other resonant modules 10 that are not in a heating state, even when some resonant modules 10 in the electromagnetic heating circuit 100 are in a heating state.

[0033] In some embodiments, the electromagnetic heating circuit 100 further includes an AC power supply module 80 and a rectifier-filter module 90. The AC power supply module 80 provides AC power to the electromagnetic heating circuit 100. The rectifier-filter module 90 converts the AC signal output by the AC power supply module 80 into a DC signal and filters out high-frequency noise in the DC signal, making the output signal more stable. The AC power supply module 80 is connected to the input terminal of the rectifier-filter module 90, and the output terminal of the rectifier-filter module 90 is connected to the inverter module 30.

[0034] In summary, the electromagnetic heating circuit provided in this 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 resonant module selected 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 resonant module and the oscillation drive module form a three-point capacitive oscillation circuit under the action of the oscillation drive signal, the equivalent resistance of the heating coil in the three-point capacitive oscillation circuit varies with the target position. Whether or not a pot is placed changes. When the equivalent resistance of the heating coil changes, the amplitude of the oscillation waveform output by the oscillation drive module changes accordingly. The peak voltage signal determined based on the amplitude of the output signal of the oscillation drive module also changes accordingly. Therefore, the pot can be detected based on the above peak voltage signal. The above pot detection process does not involve the inverter module. Under the premise that the inverter module sends drive pulse signals to other resonant modules besides the target resonant module, it can also detect whether a pot 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 pot is placed at the position corresponding to other resonant modules that are not in the heating state.

[0035] The following is combined Figure 2 right Figure 1 The various modules involved in the provided electromagnetic heating circuit 100 are described. Figure 2 A circuit diagram of an electromagnetic heating circuit 100 provided in another embodiment of this application is shown.

[0036] The resonant module 10 includes a heating coil 110 and at least one resonant capacitor 120. The heating coil 110 generates an alternating magnetic field at resonance. When an iron-containing container is placed at the position corresponding to the heating coil, the container cuts the magnetic lines of force of the alternating magnetic field, generating eddy currents at the bottom of the container. These eddy currents cause charge carriers at the bottom of the container to move at high speed and randomly. The charge carriers collide and rub against each other, generating heat energy, thus achieving the heating effect. 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. Figure 2 In this embodiment, 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 terminal of the first resonant capacitor C11 and the second resonant capacitor C12.

[0037] exist Figure 2 In this embodiment, 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.

[0038] The inverter module 30 is used to convert DC power into AC power with fixed frequency and voltage or adjustable frequency and voltage. The inverter module 30 can be a half-bridge inverter circuit, a full-bridge inverter circuit, or a single-transistor inverter circuit; the implementation form is not limited in this application embodiment. Figure 2 In this embodiment, 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 one end of the rectifier-filter module 90 and the series branch (the series branch formed by the first resonant capacitor C11 and the second resonant capacitor C12 connected in series). The emitter of Q2 is connected to the collector of Q2, and the emitter of Q2 is connected to the other end of the rectifier-filter module 90 and the series branch. The gates of Q1 and Q2 are respectively connected to the control module 70.

[0039] The gating switch 40 is a multi-to-one analog switch. The gating switch 40 includes a common terminal, multiple selection 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. The multiple selection terminals are connected one-to-one to the second position terminals 240 of at least two switch modules 20. The number of selection terminals can be greater than or equal to the number of switch modules 20. When the number of selection terminals exceeds the number of switch modules 20, some selection terminals are unconnected. The control terminal is connected to the control module 70. The number of control terminals is determined by the number of selection terminals; for example, if there are 8 selection terminals, there are 3 control terminals; or, for example, if there are 16 selection terminals, there are 4 control terminals. Figure 2 In this embodiment, the selection switch 40 is an eight-to-one analog switch, which includes eight selection pins (i.e., selection terminals) such as Y0 to Y7, three control pins (i.e., control terminals) such as S0, A1, and A2, and a common pin z (i.e., common terminal).

[0040] exist Figure 2 In this embodiment, the oscillation driving module 50 includes a second resistor 510, a third resistor 520, a fourth resistor 530, a fifth resistor 540, a transistor 550, a second capacitor 560, a third capacitor 570, and a fourth capacitor 580.

[0041] The second resistor 510 and the third resistor 520 are connected in series to form a first series branch. One end of the first series branch is connected to a designated power supply, and the other end is grounded. The common terminal of the second resistor 510 and the third resistor 520 is connected to the base of the transistor 550. The second resistor 510 and the third resistor 520 are used to provide a voltage divider to the base of the transistor 550. The designated power supply can be a +5V low voltage, so the voltage at the base of the transistor 550 is 2.5V.

[0042] One end of the fourth resistor 530 is connected to a specified power supply, and the other end of the fourth resistor 530 is connected to the collector of the transistor 550. The fourth resistor 530 is used to divide the voltage at the collector of the transistor 550.

[0043] One end of the fifth resistor 540 is connected to the emitter of the transistor 550, and the other end is grounded. The fifth resistor 540 is used to divide the voltage at the emitter of the transistor 550.

[0044] 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 second series branch. One end of the second series branch is connected to the collector of the transistor 550 and the voltage acquisition module 60, and the other end is grounded. The common terminal 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.

[0045] In this embodiment, transistor 550 is an NPN transistor, whose conduction condition is that the base voltage is higher than the emitter voltage and the collector voltage is lower than the base voltage. In this embodiment, when transistor 550 is turned on, the third capacitor 570 and the fourth capacitor 580 charge, causing the emitter and collector voltages to rise, thus failing to meet the conduction condition of transistor 550. At this point, the transistor is turned off, and the third capacitor 570 and the fourth capacitor 580 begin to discharge, causing the emitter and collector voltages to decrease until the conduction condition of transistor 550 is met again. The oscillation circuit formed by the third capacitor 570 and the fourth capacitor 580, together with the heating coil in the resonant module that receives the driving oscillation signal, forms a three-point capacitive oscillation circuit.

[0046] When the heating coil covers a metal cookware, the equivalent resistance of the heating coil is related to the distance between the metal cookware and the heating coil, referring to the reference. Figure 3The diagram illustrates the relationship between the equivalent resistance (Rs) of the heating coil and the distance (D) between the metal pot and the heating coil according to one embodiment of this application. As the distance between the metal pot and the heating coil increases, the equivalent resistance of the heating coil gradually decreases; conversely, as the distance decreases, the equivalent resistance of the heating coil increases. An increase in the equivalent resistance of the heating coil indicates increased losses in the aforementioned three-point capacitive oscillation circuit, resulting in a decrease in the amplitude of the oscillation waveform output by the oscillation drive module 50. Conversely, a decrease in the equivalent resistance of the heating coil indicates decreased losses in the aforementioned three-point capacitive oscillation circuit, resulting in an increase in the amplitude of the oscillation waveform output by the oscillation drive module 50.

[0047] The voltage signal extraction module 60 is used to output the 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 60 is used to convert the amplitude of the analog signal output by the oscillation driving module 50 into a stable and smooth DC voltage signal, that is, the aforementioned peak voltage signal.

[0048] exist Figure 2 In this embodiment, the voltage signal extraction module 60 includes a diode 610, a first capacitor 620, and a first resistor 630. The anode of the diode 610 is connected to the oscillation drive module 50. Optionally, the forward voltage drop of the diode 610 is 0V. The first capacitor 620 and the first resistor 630 are connected in parallel to form a parallel circuit, one end of which is grounded, and the other end is connected to the cathode of the diode 610 and the control module 70. The first capacitor 620 is used to stabilize the voltage of the output signal of the voltage acquisition module 60. Optionally, the capacitance of the first capacitor 620 is 0.1 microfarads. The first resistor 630 is a discharge resistor, and its resistance value is usually large, such as 100kΩ.

[0049] Reference Figure 4Part (a) shows the waveform of the oscillation waveform output by the oscillation drive module 50. At time t1, when the heating coil in the target resonant module is not covered by the metal pot, the voltage of the oscillation waveform output by the oscillation drive module 50 is at its maximum value. At this time, the peak value of the output voltage (i.e., the W1 voltage) of the oscillation drive module 50 is 3.5V, and the forward voltage drop of the diode is 0V. If the voltage at the output terminal of the voltage signal extraction module 60 (i.e., the V1 voltage) is less than 3.5V, then the diode 610 conducts, and the voltage at the output terminal of the voltage signal extraction module 60 is raised to 3.5V. Due to the energy storage effect of the first capacitor 620, the resistance of the first resistor 630 is relatively large, so the voltage at the output terminal of the voltage acquisition module 60 remains unchanged for a period of time. At time t3, when the heating coil in the target resonant module is covered by the metal pot, the peak value of the oscillation waveform output by the oscillation drive module 50 is 3.5V. When the cookware is covered, at the moment when the voltage of the oscillation waveform output by the oscillation drive module 50 reaches its maximum value, the output voltage of the oscillation drive module 50 (i.e., voltage W3) is less than the voltage W1. If the voltage at the output terminal of the voltage signal extraction module 60 (i.e., voltage V3) is higher than 3V, the voltage at the output terminal of the voltage signal extraction module 60 is discharged to 3V by the first resistor 630. If the voltage at the output terminal of the voltage signal extraction module 60 is lower than 3V, the diode 610 conducts, and the voltage at the output terminal of the voltage signal extraction module 60 is raised to 3V. Due to the energy storage effect of the first capacitor 620, the resistance of the first resistor 630 is relatively large, so the voltage at the output terminal of the voltage signal extraction module 60 remains unchanged for a period of time. Figure 4 As can be seen, by reasonably determining the specified voltage threshold, the control module 70 can perform cookware detection based on the relationship between the voltage at the output terminal of the voltage signal extraction module 60 and the specified voltage threshold.

[0050] The control module 70 is connected to the inverter module 30, the voltage signal extraction module 60, and at least two switching modules 20. Figure 2 In this embodiment, the control module 70 is connected to the gates of Q1 and Q2 in the inverter module 30, respectively, and is used to send drive pulse signals to Q1 and Q2. Optionally, the control module 70 includes at least two first control pins, which are connected one-to-one to the first position terminals 230 of at least two switching modules 20, and are used to control the active terminals 220 of at least two switching modules 20 to contact the first position terminal 230 or the second position terminal 240. Figure 2 In this embodiment, at least two first control pins are R1-Rn. Optionally, the control module 70 includes at least two second control pins, which are connected to the control terminals of the gating module 40 respectively, and are used to output the selection pin for this conduction to the gating module 40. Figure 2In this embodiment, at least two second control pins are S0, A1, and A2. Optionally, the control module 70 includes an input pin connected to the output of the comparator 660 for receiving the cathode of the diode 610.

[0051] In this embodiment, the control module 70 is configured to control the active end of the first switch module in 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 connect the circuit between the target resonant module and the oscillation drive module 50; acquire the output result of the voltage signal extraction module 60, the output result being the peak voltage signal of the oscillation drive module 50; 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. The implementation details of the pot detection by the control module 70 will be described in the following method embodiments.

[0052] In summary, the technical solution provided in this 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 resonant module selected 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 resonant module and the oscillation drive module form a three-point capacitive oscillation circuit under the action of the oscillation drive signal, the equivalent resistance of the heating coil in the three-point capacitive oscillation circuit changes with the target position. When the equivalent resistance of the heating coil changes due to the placement of a cookware, the amplitude of the oscillation waveform output by the oscillation drive module changes accordingly. The peak voltage signal determined based on the amplitude of the output signal of the oscillation drive module also changes accordingly. Therefore, cookware detection can be performed based on the above peak voltage signal. The above cookware detection process does not involve the inverter module. Under the premise that the inverter module sends drive pulse signals to other resonant modules besides 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 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] Please refer to Figure 5 This illustration shows a schematic diagram of an electrical device 500 provided in one embodiment of this application. The electrical device 500 may be an electromagnetic heating device with multiple heating coils, such as an electromagnetic multi-burner stove. The electrical device 500 includes, for example,... Figure 1 or Figure 2 The electromagnetic heating circuit 100 is shown.

[0054] In some embodiments, the electrical device 500 includes a housing for accommodating the electromagnetic heating circuit 100. In some embodiments, the housing of the electrical device 500 includes an operation panel connected to a control module. The operation panel includes multiple functional controls, such as a start control, a heating time adjustment control, a heating power adjustment control, etc. When the operation panel receives a trigger signal for a specific functional control, it generates a corresponding electrical signal and sends it to the control module. The control module executes corresponding control commands based on the electrical signal, thereby enabling interaction between the user and the electrical device 500.

[0055] Reference Figure 6 This document illustrates a flowchart of a control method for an electrical device according to an embodiment of this application. The electrical device includes, for example: Figure 1 Alternatively, the electromagnetic heating circuit 100 provided by 2. The method includes the following process.

[0056] S601 controls the active end of the first switch module in at least two switch modules to contact the second position end.

[0057] The number of the first switching modules can be less than or equal to the number of switching modules included in the electromagnetic heating circuit.

[0058] In some embodiments, after the electrical equipment receives a start command, all switch modules are identified as the first switch module, and the active end of the first switch module is controlled to contact the second position end, thereby connecting the circuit between the resonant module and the selection module connected to the switch module.

[0059] 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 a heating state as the first switching modules and controls the movable end of the first switching module to contact the second position end. Specifically, the movable end of the switching module connected to the resonant module in the heating state contacts the first position end to open the circuit between the resonant module and the inverter module. The inverter module then sends a drive pulse signal to the resonant module to cause the resonant module to enter the heating state.

[0060] Combination Figure 2 As can be seen from the embodiments, the control module includes at least two first control pins (R1 to Rn), and different first control pins are connected to the first position terminals of different switching modules. The control module can send control signals to the switching modules connected to the first control pins through the first control pins to instruct the active terminal of the first switching module to contact the second position terminal, thereby opening the circuit between the resonant module and the gating module connected to each first switching module.

[0061] S602, determine the target resonant module in the resonant module connected to the first switching module, and control the gating module to select and connect the circuit between the target resonant module and the oscillation drive module.

[0062] When there is only one first switch module, the electrical equipment directly identifies the resonant module connected to the first switch module as the target resonant module; when there are multiple first switch modules, the electrical equipment sequentially identifies the first switch module as the target resonant module according to the order of the selection terminal numbers of the selection module.

[0063] Combination Figure 2 As can be seen from the embodiment, the control module includes three second control pins (A0, A1, A2). The output signals of the above 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 switching module of 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 by the gating module can be seen in Table-1 below.

[0064]

[0065] Table 1

[0066] After the circuit between the oscillation drive module and the target resonant module is established, the oscillation drive module sends an oscillation drive signal to the target resonant module. The frequency of this oscillation drive signal is set experimentally or empirically; optionally, the frequency of the oscillation drive signal is greater than 100 kHz. Optionally, the duration of the drive pulse signal sent by the oscillation drive signal to the target resonant module is a preset duration, which is set experimentally or empirically; for example, the preset duration is 10 seconds.

[0067] During the process of the oscillation drive module sending the oscillation drive signal to the target resonant module, the voltage signal extraction module can convert the amplitude of the oscillation waveform output by the oscillation drive module into a stable and smooth DC voltage signal, that is, output the peak voltage signal of the oscillation drive module based on the amplitude of the output signal of the oscillation drive module.

[0068] Furthermore, it should be noted that during the process of the oscillation drive module sending the oscillation drive signal to the target resonant module, the current flowing through the heating coil in the target resonant module is typically 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 the 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 the oscillation drive signal to the target resonant module. This reduces the power consumed during the cookware detection process, thereby saving power consumption of the electrical equipment.

[0069] S603, obtain the output result of the voltage signal extraction module.

[0070] The output is the peak voltage signal of the oscillation drive module. Combined with... Figure 2 In this example, the control module reads the output of the voltage signal extraction module from the V pin.

[0071] S604, based on the peak voltage signal detection of the oscillation drive module, detects whether a pot is placed at the target position corresponding to the target resonant module.

[0072] In some embodiments, the control module determines the peak voltage of the oscillation drive module based on the peak voltage signal; if the peak voltage of the oscillation drive module is less than a specified voltage threshold, it determines that a pot is placed at the target location; if the output voltage of the oscillation drive module is greater than or equal to the specified voltage threshold, it determines that no pot is placed at the target location.

[0073] 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 experimentation or experience; for example, the specified voltage threshold is 3.2V. Please refer again. Figure 4 At time t1, the peak voltage determined by the peak voltage signal output by the voltage signal extraction module is 3.5V, which is greater than the specified voltage threshold. Therefore, at time t1, no cookware is placed at the target location. At time t3, the peak voltage determined by the peak voltage signal output by the voltage signal extraction module is 3V, which is less than the specified voltage threshold. Therefore, at time t3, a cookware is placed at the target location.

[0074] After the oscillation drive module sends an oscillation drive signal to the target resonant module selected by the gating module, the resonant module forms a capacitive 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 capacitive three-point oscillation circuit changes depending on whether it is covered by a metal pot. When the equivalent resistance of the heating coil changes, the amplitude of the oscillation waveform output by the oscillation drive module changes. 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 a pot.

[0075] In some embodiments, when the control module determines that the heating coil covers the cookware, it sets the value of the cookware flag corresponding to the coil to a first value; when the heating coil does not cover the cookware, it sets the value of the cookware flag corresponding to the coil to a second value. The first and second values ​​are set based on experiments or experience; for example, the first value is 1 and the second value is 0.

[0076] In summary, the technical solution provided in this 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 resonant module selected 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 resonant module and the oscillation drive module form a three-point capacitive oscillation circuit under the action of the oscillation drive signal, the equivalent resistance of the heating coil in the three-point capacitive oscillation circuit changes with whether a pot is placed at the target position. When the equivalent resistance of the heating coil changes due to the change in the position of the cookware, the amplitude of the oscillation waveform output by the oscillation drive module changes accordingly. The peak voltage signal determined based on the amplitude of the output signal of the oscillation drive module also changes accordingly. Therefore, cookware detection can be performed based on the above peak voltage signal. The above cookware detection process does not involve the inverter module. Under the premise that the inverter module sends drive pulse signals to other resonant modules besides 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.

[0077] Please refer to Figure 7 This document illustrates a flowchart of a control method for an electrical device according to an embodiment of this application. The electrical device includes, for example: Figure 1 Alternatively, the electromagnetic heating circuit 100 provided by 2. The method includes the following process.

[0078] S701 controls the active end of the first switch module in at least two switch modules to contact the second position end.

[0079] S702, determine the target resonant module in the resonant module 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.

[0080] The oscillation drive module is used to send oscillation drive signals to the target resonant module.

[0081] S703, obtain the output result of the voltage signal extraction module.

[0082] The output is the peak voltage signal of the oscillation drive module.

[0083] S704, based on the peak voltage signal detection of the oscillation drive module, detects whether a pot is placed at the target position corresponding to the target resonant module.

[0084] S705, when it is determined that a pot is placed at the target location, the active end of the switch module connected to the target resonant module is brought into contact with the first position end to conduct the circuit between the target resonant module and the inverter module.

[0085] Combination Figure 2 In the example, the control module sends a control signal to the switch module through the first control pin corresponding to the switch module connected to the target resonant module, so that the active end of the switch module contacts the first position end. In this way, the circuit between the target resonant module and the inverter module is connected, and the circuit between the target resonant module and the gating module is disconnected.

[0086] S706 controls the inverter module to send drive pulse signals to the target resonant module.

[0087] The duty cycle of the drive pulse signal can be determined according to the power requirements of the electrical equipment, and this application does not limit this.

[0088] In summary, the technical solution provided in this 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 resonant module selected 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 resonant module and the oscillation drive module form a three-point capacitive oscillation circuit under the action of the oscillation drive signal, the equivalent resistance of the heating coil in the three-point capacitive oscillation circuit changes with whether a pot is placed at the target position. When the equivalent resistance of the heating coil changes due to the change in the position of the cookware, the amplitude of the oscillation waveform output by the oscillation drive module changes accordingly. The peak voltage signal determined based on the amplitude of the output signal of the oscillation drive module also changes accordingly. Therefore, cookware detection can be performed based on the above peak voltage signal. The above cookware detection process does not involve the inverter module. Under the premise that the inverter module sends drive pulse signals to other resonant modules besides 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.

[0089] Please refer to Figure 8 This diagram illustrates a structural block diagram of a control device for an electrical appliance according to an embodiment of this application. The electrical appliance includes, for example, […]. Figure 1 or Figure 2 The electromagnetic heating circuit shown includes: a first control module 810, a second control module 820, a result acquisition module 830, and a cookware detection module 840.

[0090] The first control module 810 is 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.

[0091] The second control module 820 is used to determine the target resonant module among the resonant modules connected to the first switch module, and to control the gating module to select and conduct the circuit 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.

[0092] The result acquisition module 830 is used to acquire the output result of the voltage signal extraction module, and the output result is the peak voltage signal of the oscillation drive module.

[0093] The cookware detection module 840 is used to detect whether a cookware is placed at the target position corresponding to the target resonant module based on the peak voltage signal of the oscillation drive module.

[0094] In some embodiments, the cookware detection module 850 is configured to determine the peak voltage of the oscillation drive module based on the peak voltage signal; determine that a cookware is placed at the target location if the peak voltage of the oscillation drive module is less than a specified voltage threshold; and determine that no cookware is placed at the target location if the output voltage of the oscillation drive module is greater than or equal to the specified voltage threshold.

[0095] In some embodiments, the device includes a third control module and a fourth control module (not shown in the figures). The third control module is used to control the active terminal of the switch module connected to the target resonant module to contact the first position terminal when a pot is determined to be placed at the target location, thereby establishing a circuit between the target resonant module and the inverter module. The fourth control module is used to control the inverter module to send a drive pulse signal to the target resonant module.

[0096] In some embodiments, the second control module 720 is used to determine the resonant modules connected to the plurality of first switch modules as target resonant modules in sequence according to the sequence number of the selection terminal of the gating module, and control the gating module to select and conduct the circuit between the target resonant module and the oscillation drive module.

[0097] In summary, the technical solution provided in this 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 resonant module selected 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 resonant module and the oscillation drive module form a three-point capacitive oscillation circuit under the action of the oscillation drive signal, the equivalent resistance of the heating coil in the three-point capacitive oscillation circuit changes with whether a pot is placed at the target position. When the equivalent resistance of the heating coil changes due to the change in the position of the cookware, the amplitude of the oscillation waveform output by the oscillation drive module changes accordingly. The peak voltage signal determined based on the amplitude of the output signal of the oscillation drive module also changes accordingly. Therefore, cookware detection can be performed based on the above peak voltage signal. The above cookware detection process does not involve the inverter module. Under the premise that the inverter module sends drive pulse signals to other resonant modules besides 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.

[0098] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described device and module can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0099] In the several embodiments provided in this application, the coupling between modules can be electrical, mechanical, or other forms of coupling.

[0100] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0101] like Figure 9 As shown in the example, this application also provides an electrical device 900, which includes a processor 910 and a memory 920. The memory 920 stores computer program instructions.

[0102] The processor 910 may include one or more processing cores. The processor 910 connects to various parts of the entire battery management system using various interfaces and lines, and performs various functions and processes data of the battery management system by running or executing instructions, programs, code sets, or instruction sets stored in the memory 920, and by calling data stored in the memory 920. Optionally, the processor 910 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 910 may integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the displayed content; and the modem handles wireless communication. It is understood that the modem may also not be integrated into the processor 910 and may be implemented separately through a communication chip.

[0103] The memory 920 may include random access memory (RAM) or read-only memory (ROM). The memory 920 can be used to store instructions, programs, code, 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 touch functionality, sound playback functionality, etc.), and instructions for implementing various methods described below. The data storage area may also store data generated during the use of the electrical device.

[0104] Please see Figure 10 The present application also provides a computer-readable storage medium 1000, which stores computer program instructions 1010 that can be invoked by a processor to execute the methods described in the above embodiments.

[0105] The computer-readable storage medium 1000 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read-Only Memory), EPROM, hard disk, or ROM. Optionally, the computer-readable storage medium 1000 includes a non-transitory computer-readable storage medium. The computer-readable storage medium 1000 has storage space for computer program instructions 1010 that perform any of the method steps described above. These computer program instructions 1010 can be read from or written to one or more computer program products. The computer program instructions 1010 may be compressed in an appropriate form.

[0106] The above are merely preferred examples of this application and are not intended to limit this application in any way. Although this application has disclosed the preferred examples above, they are not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent examples without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above examples based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An electromagnetic heating circuit, characterized by, The application relates to a cooking utensil detection device. The application comprises: at least two resonance modules; at least two switch modules, which comprise a fixed end, a movable end, a first position end and a second position end; the fixed end of each of the at least two switch modules is connected to the at least two resonance modules one by one; 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 connected to the oscillation driving module, which 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; a control module connected to the inverter module, the voltage signal extraction module, the gating module and the at least two switch modules, which is configured to control the movable end of a first switch module among the at least two switch modules to be in contact with the second position end, determine the target resonance module among the resonance modules connected to the first switch module, control the gating module to select to turn on a loop between the target resonance module and the oscillation driving module, and obtain the output result of the voltage signal extraction module, which is the peak voltage signal of the oscillation driving module; 2. The circuit of claim 1, wherein, detect whether a target position corresponding to the target resonance module is placed with a cooking utensil based on the peak voltage signal of the oscillation driving module. The voltage signal extraction module comprises a diode, a first capacitor and a first resistor; the anode of the diode is connected to the oscillation driving module; 3. The circuit of claim 1, wherein, the first capacitor and the first 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. The oscillation driving module comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a triode, a second capacitor, a third capacitor and a fourth capacitor; the second resistor and the third resistor are connected in series to form a first series branch, one end of the first series branch is connected to a specified power supply, and the other end of the first series branch is grounded; the common end of the second resistor and the third resistor is connected to the base of the triode; one end of the fourth resistor is connected to the specified power supply, and the other end of the fourth resistor is connected to the collector of the triode; one end of the fifth resistor is connected to the emitter of the triode, and the other end of the fifth resistor is grounded; one end of the second capacitor is connected to the base of the triode, and the other end of the second capacitor is grounded; 4. The circuit of claim 1, wherein, the third capacitor and the fourth capacitor are connected in series to form a second series branch, one end of the second series branch is connected to the collector of the triode and the voltage signal extraction module, the other end of the second series branch is grounded, and the common end of the third capacitor and the fourth capacitor is connected to the emitter of the triode. The gating module comprises a selection control end, at least two selection ends and a common end; the selection control end is connected to the control module; At least two of the selection terminals are connected to the second position terminals of at least two of the switch modules in one-to-one correspondence; The common terminal is connected to the oscillation driving module.

5. A control method of an electric appliance device, characterized by, The electrical appliance comprises the electromagnetic heating circuit according to any one of claims 1 to 4, and the method comprises: controlling the active terminal of a first switch module among the at least two switch modules to be in contact with the second position terminal; determining a target resonant module among the resonant modules connected to the first switch module, and controlling the gating module to select to turn on a loop between the target resonant module and the oscillation driving module; the oscillation driving module is configured to send the oscillation driving signal to the target resonant module; obtaining an output result of the voltage signal extraction module, the output result being a peak voltage signal output by the oscillation driving module; detecting, based on the peak voltage signal of the oscillation driving module, whether a target position corresponding to the target resonant module is placed with a pot.

6. The method of claim 5, wherein, The detection, based on the peak voltage signal of the oscillation driving module, of whether the target position corresponding to the target resonant module is placed with a pot comprises: determining a peak voltage of the oscillation driving module based on the peak voltage signal; in a case where the peak voltage of the oscillation driving module is less than a specified voltage threshold, determining that the target position is placed with a pot; in a case where the output voltage of the oscillation driving module is greater than or equal to the specified voltage threshold, determining that the target position is not placed with a pot.

7. The method according to claim 5 or 6, characterized in that, After the detection, based on the peak voltage signal of the oscillation driving module, of whether the target position corresponding to the target resonant module is placed with a pot, the method further comprises: in a case where it is determined that the target position is placed with a pot, controlling the active terminal of the switch module connected to the target resonant module to be in contact with the first position terminal, so as to turn on a loop between the target resonant module and the inverter module; controlling the inverter module to send a driving pulse signal to the target resonant module.

8. The method according to claim 5 or 6, characterized in that, In a case where there are a plurality of the first switch modules, the determination, among the resonant modules connected to the first switch module, of a target resonant module, and the control of the gating module to select to turn on a loop between the target resonant module and the oscillation driving module, comprise: in a sequence order of the selection terminals of the gating module, sequentially determining, as the target resonant module, the resonant modules respectively connected to the plurality of first switch modules, and controlling the gating module to select to turn on a loop between the target resonant module and the oscillation driving module.

9. A control device for an electric appliance, characterized by comprising: The electrical appliance comprises the electromagnetic heating circuit according to any one of claims 1 to 4, and the device comprises: a first control module configured to control the active terminal of a first switch module among the at least two switch modules to be in contact with the second position terminal; a second control module configured to determine a target resonant module among the resonant modules connected to the first switch module, and control the gating module to select to turn on a loop between the target resonant module and the oscillation driving module, the oscillation driving module being configured to send an oscillation driving signal to the target resonant module; An output result of the voltage signal extraction module is obtained by an output result obtaining module, and the output result is a peak voltage signal of the oscillation driving module; A pot detection module is configured to detect whether a pot is placed on a target position corresponding to the target resonance module based on the peak voltage signal of the oscillation driving module.

10. An electrical appliance characterized by The electric appliance comprises the electromagnetic heating circuit according to any one of claims 1 to 4. The control module in the electromagnetic heating circuit comprises one or more processors. A memory; One or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the one or more processors, and the one or more application programs are configured to execute the method according to any one of claims 5 to 8.

11. A computer readable storage medium, characterized in that, The computer readable storage medium stores program codes, and the program codes are called and executed by a processor to execute the method according to any one of claims 5 to 8.

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