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

Abstract

The invention discloses an electromagnetic heating circuit, a control method and device of electrical equipment and the electrical equipment. The circuit comprises at least two resonance modules. Each switch module comprises a fixed end, a movable end, a first position end and a second position end; the fixed ends of the at least two switch modules are connected to the at least two resonance modules in a one-to-one correspondence manner; the inversion 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 comparison module is connected to the oscillation driving module; and the control module is connected with the inversion module, the comparison module, the gating module and the at least two switch modules. According to the technical scheme provided by the embodiment of the invention, when part of the resonance modules in the electromagnetic heating circuit are in the heating state, whether cookware is placed at the positions corresponding to other resonance modules which are not in the heating state or not can be detected.

Description

Technical Field

[0001] 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 electrical equipment. Background Art

[0002] Electromagnetic heating equipment (such as induction cooker, electromagnetic integrated stove, etc.) is a widely used household appliance, which is made based on the principle of electromagnetic induction.

[0003] The electromagnetic heating device usually controls the heating coil to start heating after detecting that the heating coil is covered with a pot. The method for the electromagnetic heating device to detect the pot is as follows: the electromagnetic heating device sends a control signal to connect each heating coil to the inverter module, controls the inverter module to output one or more cycles of detection signals, obtains the current signal characteristics flowing through each heating coil to detect whether each heating coil is covered with a pot, if so, keeps its connection with the inverter module, and sends a drive pulse signal to the heating coil through the inverter module to make the heating coil start heating, if not, disconnects it from the inverter module.

[0004] 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 perform cookware detection on the heating coils that have not started heating. Summary of the invention

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

[0006] 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 includes a fixed end, a movable end, a first position end and a second position end; the fixed ends of the at least two switch modules are connected to the at least two resonant modules in a one-to-one correspondence; 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 magnitude relationship between the output voltage of the oscillation drive module and the specified voltage , and obtain a comparison result; a control module is connected to the inverter module, the comparison 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 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 driving 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 the oscillation period and / or the oscillation frequency; detect whether the target position corresponding to the target resonance module is placed with a pot based on the oscillation parameters of the target resonance module.

[0007] In a second aspect, an embodiment of the present application provides a control method for an electrical device, which is applied to an electromagnetic heating circuit such as the first 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 a target resonance module in the resonance module connected to the first switch module, and controlling the selection module to select a loop between the target resonance module of the comparison module and the oscillation drive module; the oscillation drive module is used to send an oscillation drive signal to the target resonance module; obtaining a comparison result output by the comparison module; determining the oscillation parameters of the target resonance module based on the comparison result, the oscillation parameters of the target resonance module including an oscillation period and / or an oscillation frequency; and detecting whether a pot is placed at a target position corresponding to the target resonance module based on the oscillation parameters of the target resonance module.

[0008] In a third aspect, an embodiment of the present application provides a control device for an electrical device, which is applied to an electromagnetic heating circuit such as the first aspect, and the device includes: a first control module, which is used to control the active end of the first switch module among at least two switch modules to contact the second position end; a second control module, which is used to determine a target resonance module among the resonance modules connected to the first switch module, and control the selection module to select and conduct the loop between the target resonance module and the oscillation drive module, the oscillation drive module is used to send an oscillation drive signal to the target resonance module; a result acquisition module, which is used to obtain a comparison result output by the comparison module; an oscillation parameter determination module, which is used 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; a pot detection module, which is used to determine whether a pot is placed at a target position corresponding to the target resonance module based on the oscillation parameters of the target resonance module.

[0009] In a fourth aspect, an embodiment of the present application provides an electrical device, which includes an electromagnetic heating circuit as in the first 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 a method as in the second aspect.

[0010] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, in which a program code is stored, and the program code is called by a processor to execute the method of the second aspect.

[0011] In a sixth aspect, an embodiment of the present application provides a computer program product, which, when executed, is used to implement the method of the second aspect.

[0012] Compared with the prior art, the technical solution provided in the embodiment of the present application adds an oscillation driving module, a gating module and a comparison module in the electromagnetic heating circuit. The oscillation driving module sends an oscillation driving signal to the target resonance module selected by the gating module for conduction. 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 cookware 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 vary with whether a cooker 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 cooker is placed at the target position. The above-mentioned cooker 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 cooker 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 cooker is placed at the position corresponding to other resonant modules that are not in a heating state. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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.

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

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

[0016] Figure 3 This is a relationship diagram between the inductance of a heating coil and the distance between the heating coil and a metal cookware provided in one embodiment of the present application.

[0017] Figure 4 It 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.

[0018] Figure 5 It is a schematic diagram of an electrical device provided by an embodiment of the present application.

[0019] Figure 6It is a flow chart of a control method of an electrical device provided by an embodiment of the present application.

[0020] Figure 7 This is a flow chart of a method for controlling an electrical device provided in another embodiment of the present application.

[0021] Figure 8 It is a block diagram of a control device for an electrical device provided in one embodiment of the present application.

[0022] Fig. 9 It is a structural block diagram of an electrical device provided in one embodiment of the present application.

[0023] Fig.10 It is a structural block diagram of a computer-readable storage medium provided by an embodiment of the present application. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and 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 cannot be understood as limiting the present application.

[0025] 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, rather than 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 work are within the scope of protection of the present application.

[0026] 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 resonance modules 10, at least two switch modules 20, an inverter module 30, a gating module 40, an oscillation driving module 50, a comparison module 60 and a control module 70.

[0027] 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 a position corresponding to the above-mentioned heating coil, the iron-containing container cuts the magnetic lines of force of the alternating magnetic field to generate 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 collide and rub against each other to generate heat energy, thereby playing a heating role.

[0028] The switch module 20 is used to turn on or off the circuit between the resonance module 10 and the inverter module 30, and to turn on or off the circuit between the resonance module 10 and the gating module 40. When the circuit between the resonance module 10 and the inverter module 30 is turned on, the circuit between the resonance module 10 and the gating module 40 is turned off; when the circuit between the resonance module 10 and the inverter module 30 is turned off, the circuit between the resonance module 10 and the gating module 40 is turned on.

[0029] Each switch module 20 includes a fixed end 210, a movable end 220, a first position end 230, and a second position end 240. The fixed ends 210 of at least two switch modules 20 are connected to at least two resonance modules 10 in a one-to-one correspondence, so the number of switch modules 20 and resonance 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 resonance module 10 connected to the switch module 20 and the inverter module 30 is connected. 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 resonance module 10 connected to the switch module 20 and the gating module 40 is connected.

[0030] The inverter module 30 is used to convert the DC power supply into high-frequency AC power, and output a stable AC power supply through a transformer and a filter circuit. The gating module 40 is used to select and conduct the circuit between a certain resonance module 10 and the driving oscillation module 50. The oscillation driving module 50 is connected to the gating module 40 and is used to send an oscillation driving signal to the resonance module 10 selected to be conducted by the gating module 40. The comparison module 60 is connected to the oscillation driving module 50 and is used to compare the magnitude relationship between the output voltage of the oscillation driving module 50 and the specified voltage to obtain a comparison result.

[0031] The control module 70 is connected to the comparison module 60, the inverter module 30 and at least two switch modules 10. The control module 70 is configured to: control the active end 220 of the first switch module in the at least two switch modules 20 to contact the second position end 240; determine the target resonance module in the resonance module 10 connected to the first switch module, and control the selection module to select the circuit between the target resonance module and the oscillation drive module 50, and the oscillation drive module 50 is used to send an oscillation drive signal to the target resonance module; obtain the frequency detection result of the target resonance module output by the comparison module 60, and the frequency detection result of the target resonance module indicates whether the oscillation frequency of the oscillation sent by the target resonance module based on the oscillation drive signal is greater than the specified frequency; determine whether the target position corresponding to the target resonance module is placed with a pot based on the frequency detection result of the target resonance module. The implementation details of the control module 70 for pot detection will be described in the following method embodiment.

[0032] After the oscillation driving module 50 sends an oscillation driving signal to the target resonance module selected by the selection module 40 to be turned on, the resonance module forms a capacitor three-point oscillation circuit with the oscillation driving module 50 under the action of the oscillation driving signal. 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 a 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 a pot is placed at the target position. The above-mentioned pot detection process does not involve the inverter module 30. On the premise that the inverter module 30 sends a driving pulse signal to other resonance modules 10 other than the target resonance module, it can also detect whether a pot is placed at the target position corresponding to the target resonance module. That is, the electromagnetic heating circuit provided in the embodiment of the present application can detect whether a pot is placed at the position corresponding to other resonance modules 10 that are not in the heating state even when some resonance modules 10 in the electromagnetic heating circuit 100 are in the 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 is used to provide AC power to the electromagnetic heating circuit 100. The rectifier filter module 90 is used to convert the AC power signal output by the AC power supply module 80 into a DC power signal, and filter out the high-frequency noise in the DC power signal to make the output power signal more stable. The AC power supply module 80 is connected to the input end of the rectifier filter module 90, and the output end of the rectifier filter module 90 is connected to the inverter module 30.

[0034] In summary, the electromagnetic heating circuit provided in the embodiment of the present application is provided with an oscillation driving module, a gating module and a comparison module in the electromagnetic heating circuit. The oscillation driving module sends an oscillation driving signal to the target resonance module selected by the gating module for conduction. 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 vary with whether a cooker 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 cooker is placed at the target position. The above-mentioned cooker 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 cooker 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 cooker is placed at the position corresponding to other resonant modules that are not in a heating state.

[0035] Combine the following 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 the present application is shown.

[0036] The resonance module 10 includes a heating coil 11 and at least one resonance capacitor 12. The heating coil 11 is used to generate an alternating magnetic field during resonance. When the iron-containing container is placed at a position corresponding to the heating coil, the iron-containing container cuts the magnetic lines of force of the alternating magnetic field to generate 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. The resonance capacitor 12 is used to adjust the resonance frequency, which helps the resonance module 10 to achieve strong feedback and enhance the oscillation in the circuit. Figure 2 In the embodiment, the resonance module 10 includes a heating coil 110 and two resonance capacitors 120 (a first resonance capacitor C11 and a second resonance capacitor C12). The first resonance capacitor C11 and the second resonance 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 resonance capacitor C11 and the second resonance capacitor C12.

[0037] exist Figure 2 In the 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 constant frequency and constant 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. Figure 2 In the embodiment, the inverter module 30 is a half-bridge avoidance 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 filter module 80 and one end of the series branch (a 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, the emitter of Q2 is connected to the rectifier filter module 80 and the other end of the series branch, and the gates of Q1 and Q2 are connected to the control module 70 respectively.

[0039] The selection switch 40 is a multiple-select-one analog switch. The selection switch 40 includes a common terminal, a plurality of selection terminals and a control terminal. The common terminal of the selection switch 40 is connected to the output terminal of the oscillation drive module 50. The plurality of selection terminals are connected to the second position terminals 240 of at least two switch modules 20 in a one-to-one correspondence, and the number of selection terminals may be greater than or equal to the number of switch modules 210. In the case where the number of selection terminals is greater than the number of switch modules 20, some of the selection terminals are left unconnected. The control terminal is connected to the control module 70. The number of control terminals is determined according to the number of selection terminals. For example, if the number of selection terminals is 8, the number of control terminals is 3; for another example, if the number of selection terminals is 16, the number of control terminals is 4. Figure 2 In the embodiment, the selection switch 40 is an eight-to-one analog switch, which includes eight selection pins (ie, selection terminals) such as Y0 to Y7, three control pins (ie, control terminals) such as S0, A1, and A2, and a common pin z (ie, common terminal).

[0040] exist Figure 2 In the embodiment, 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 .

[0041] 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 supply, 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 voltage division for the base of the transistor 550. The second designated power supply can be a +5V low voltage, so that the voltage of the base of the transistor 550 is 2.5V. One end of the seventh resistor 530 is connected to the second designated power supply, 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 for the collector 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 voltage for the emitter 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. 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 comparison module 60, the other end of the fourth series branch is grounded, and 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.

[0042] In the 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 the embodiment of the present application, when the transistor 550 is turned on, the third capacitor 570 and the fourth capacitor 580 will be charged, and at this time the emitter voltage and the collector voltage will increase, resulting in failure to meet the conduction condition of the transistor 550. At this time, the transistor is cut off, and the third capacitor 570 and the fourth capacitor 580 begin to discharge, and 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, and the oscillation frequency of the capacitor three-point oscillation circuit can be expressed by the following frequency calculation formula:

[0043]

[0044] 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 .

[0045] It can be seen from the above frequency calculation formula that the oscillation frequency of the above 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, wherein 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.

[0046] When the heating coil is covered with a metal pot, the equivalent inductance of the heating coil is related to the distance between the metal pot and the heating coil. Figure 3 , which shows the relationship between the inductance of the heating coil and the distance between the metal cookware and the heating coil provided by an embodiment of the present application. As the distance between the metal cookware and the heating coil increases, the equivalent inductance of the heating coil 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. Combined with reference Figure 4 Curve 1 in part (a) shows a waveform diagram of the output of the driving oscillation module when the heating coil is covered with a metal pot.

[0047] When the heating coil is not covered with metal pots, the inductance of the heating coil is fixed. Figure 4 Curve 2 in part (a) 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 between 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.

[0048] exist Figure 2 In the embodiment, the comparison module 60 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 .

[0049] 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.

[0050] 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 of which are 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.

[0051] 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 specified power supply, the second end of the second series branch is grounded, and 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 positive input terminal of the comparator 660. Optionally, the resistance of the third resistor 640 and the fourth resistor 650 is equal, both of which are 10 kilo-ohms. The first specified power supply is a +5V low voltage, so that the voltage of the negative input terminal of the comparator 660 is also 2.5V.

[0052] 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.

[0053] In the embodiment of the present application, the voltages of the positive input terminal and the negative input terminal of the comparator 660 are both 2.5V. Therefore, when the voltage of the output signal of the driving oscillation module 50 is greater than 2.5V, the comparator 660 outputs a high level. When the voltage of the output signal of the driving oscillation module 50 is less than 2.5V, the comparator 660 outputs a low level. Figure 4 , wherein part (b) shows the output waveform of the comparator 660 when the heating coil is not covered with a metal pot, and part (c) shows the output waveform of the comparator 660 when the heating coil is covered with a metal pot. Figure 4 Comparing parts (b) and (c), 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., transition from a low level to a high level) output by the comparator 660 when the heating coil is not covering the metal cookware; the second interval duration refers to the interval duration between two adjacent rising edges (i.e., transition from a low level to a high level) output by the comparator 660 when the heating coil is covering the metal cookware.

[0054] The control module 70 is connected to the inverter module 30, the comparison module 60 and at least two switch modules 20. Figure 2In the embodiment, the control module 70 is connected to the gates of Q1 and Q2 in the inverter module 30, respectively, for sending a driving pulse signal to Q1 and Q2. Optionally, the control module 70 includes at least two first control pins, and the at least two first control pins are connected to the first position ends 230 of at least two switch modules 20 in a one-to-one correspondence, for controlling the active ends 220 of at least two switch modules 20 to contact the first position ends 230 or the second position ends 240. Figure 2 In the embodiment, at least two first control pins are R1-Rn. Optionally, the control module 70 includes at least two second control pins, and the at least two second control pins are connected to the control end of the gating module 40, and are used to output the selection pins of the current conduction to the selection module 40. Figure 2 In the embodiment, the at least two second control pins are S0, A1, and A2. Optionally, the control module 70 includes an input pin, which is connected to the output end of the comparator 660 and is used to receive the output result of the comparator 660.

[0055] 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 the target resonance module in the resonance module 10 connected to the first switch module, and control the gating module 40 to select the circuit between the target resonance module and the oscillation driving module 50; obtain the comparison result output by the comparison module 60; determine the oscillation parameters of the target resonance module based on the comparison result, and the oscillation parameters of the target resonance module include the oscillation period and / or the oscillation frequency; detect whether the target position corresponding to the target resonance module is placed with a pot based on the oscillation parameters of the target resonance module. The implementation details of the control module 70 for pot detection will be described in the following method embodiment.

[0056] In summary, the technical solution provided by the embodiment of the present application is to add an oscillation driving module, a gating module and a comparison module in the electromagnetic heating circuit. The oscillation driving module sends an oscillation driving signal to the target resonance module selected by the gating module for conduction. 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 vary with whether a cooker 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 cooker is placed at the target position. The above-mentioned cooker 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 cooker 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 cooker is placed at the position corresponding to other resonant modules that are not in a heating state.

[0057] Please refer to Figure 5 , which shows a schematic diagram of an electrical device 500 provided by an embodiment of the present application. The electrical device 500 may be an electromagnetic heating device provided with multiple heating coils, such as an electromagnetic multi-burner stove. The electrical device 500 includes Figure 1 or Figure 2 An electromagnetic heating circuit 100 is shown.

[0058] In some embodiments, the electrical device 500 includes a housing, and the housing is used to accommodate the electromagnetic heating circuit 100. In some embodiments, the housing of the electrical device 500 includes an operation panel, and the operation panel is connected to the 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 certain functional control, a corresponding electrical signal is generated and sent to the control module, and the control module executes the corresponding control instruction according to the above electrical signal, thereby realizing the interaction between the user and the electrical device 500.

[0059] Combined with reference Figure 6 , which shows a flow chart of a control method of an electrical device provided by an embodiment of the present application. The electrical device includes Figure 1 Or 2 provides the electromagnetic heating circuit 100. The method includes the following process.

[0060] S601, controlling the movable end of a first switch module among at least two switch modules to contact with the second position end.

[0061] 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.

[0062] 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.

[0063] In other embodiments, when some resonant modules in the electromagnetic heating circuit are in a heating state, the electrical device determines the resonant modules that are not in a heating state as the first switch module, 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 loop between the resonant module and the inverter module, and the inverter module sends a driving pulse signal to the resonant module to put the resonant module into a heating state.

[0064] Combination Figure 2 It can be seen from the embodiment that the control module includes at least two first control pins (R1-Rn), and different first control pins are connected to the first position ends of different switch modules. The control module can send a control signal to the switch module connected to the first control pin through the first control pin to instruct the active end of the first switch module to contact the second position end, thereby conducting the loop between the resonant module and the gating module connected to each first switch module.

[0065] S602, 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.

[0066] 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.

[0067] Combination Figure 2 It can be seen from the embodiment that the control module includes three second control pins (A0, A1, A2), and the output signals of the above three control pins can be used to determine the selection pin that the gating module selects to be turned on, and the resonance module connected to the first switch module connected to the selection pin is also the target resonance module. Optionally, the relationship between the output signals of the three control pins and the selection pin that the gating module selects to be turned on can be seen in the following Table-1.

[0068]

[0069] Table-1

[0070] After the loop between the oscillation driving module and the target resonance module is connected, the oscillation driving module is used to send an oscillation driving signal to the target resonance module. The frequency of the oscillation driving signal is set according to experiments or experience. Optionally, the frequency of the oscillation driving signal is greater than 100Khz. Optionally, the duration of the oscillation driving signal sending the driving pulse signal to the target resonance module is a preset duration, which is set according to experiments or experience. Exemplarily, the preset duration is 10 seconds.

[0071] In the process of the oscillation driving module sending the oscillation driving signal to the target resonance module, the comparison module can compare the magnitude relationship between the output voltage of the oscillation driving module and the specified voltage to obtain a comparison result, thereby realizing the conversion of the analog signal output by the oscillation driving 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 driving module is greater than the specified voltage, and outputs a low level when the output voltage of the oscillation driving module is less than the specified voltage.

[0072] In addition, it should be noted that in the process of the oscillation drive module sending an oscillation drive signal to the target resonance module, the current flowing through the heating coil in the target resonance 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 according to 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 resonance module when the inverter module sends a drive pulse signal to the target resonance module; the second current refers to the current flowing through the heating coil in the target resonance module when the oscillation drive module sends an oscillation drive signal to the target resonance module. In this way, the power consumed in the cookware detection process can be reduced, thereby saving the power consumption of electrical equipment.

[0073] S603, obtaining a comparison result output by the comparison module.

[0074] Combination Figure 2 In the embodiment, the control module reads the comparison result output by the comparison module from the v pin.

[0075] S604: Determine an oscillation parameter of the target resonance module based on the comparison result.

[0076] The oscillation parameters of the target resonance module include an oscillation period and / or an oscillation frequency.

[0077] In some embodiments, when the oscillation parameters of the target resonance module include an oscillation period, S604 is implemented as: determining a time interval between two adjacent rising edges in the comparison result as the oscillation period.

[0078] The rising edge means that the output of the comparison module jumps from a low level to a high level. Figure 4 When the waveform of the output voltage of the oscillation drive module is curve 1, the comparison result output by the comparison module can be seen in Figure 4 In part (b), the oscillation period is T1; when the waveform of the output voltage of the oscillation drive module is curve 2, the comparison result output by the comparison module can be seen in Figure 4 In part (c), the oscillation period is T1.

[0079] In some embodiments, when the oscillation parameters of the target resonance module include 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.

[0080] The oscillation frequency is the inverse of the oscillation period. Figure 4 When the waveform of the output voltage of the oscillation driving module is curve 1, the oscillation frequency is 1 / T1; when the waveform of the output voltage of the oscillation driving module is curve 2, the oscillation frequency is 1 / T2.

[0081] S605: Detect 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.

[0082] 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 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. The specified time length can be set in advance. In some embodiments, the specified time length refers to the oscillation period of the target resonance module when no pot is placed at the target position. In other embodiments, the specified time length 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.

[0083] 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 set in advance. 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.

[0084] In summary, the technical solution provided by the embodiment of the present application is to add an oscillation driving module, a gating module and a comparison module in the electromagnetic heating circuit. The oscillation driving module sends an oscillation driving signal to the target resonance module selected by the gating module for conduction. 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 and the capacitance of the entire circuit are determined by the inductance of the heating coil in the target resonant module, and the inductance of the heating coil in the target resonant module changes with whether a cooker 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 cooker is placed at the target position. The above-mentioned cooker 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 cooker 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 cooker is placed at the position corresponding to other resonant modules that are not in a heating state.

[0085] Please refer to Figure 7 , which shows a flow chart of a control method of an electrical device provided by an embodiment of the present application. The electrical device includes Figure 1 Or 2 provides the electromagnetic heating circuit 100. The method includes the following process.

[0086] S701, controlling the movable end of a first switch module among at least two switch modules to contact with the second position end.

[0087] S702, 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.

[0088] The oscillation driving module is used to send an oscillation driving signal to the target resonance module.

[0089] S703, obtaining a comparison result output by the comparison module.

[0090] S704: Determine an oscillation parameter of the target resonance module based on the comparison result.

[0091] The oscillation parameters of the target resonance module include an oscillation period and / or an oscillation frequency.

[0092] S705: Detect 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.

[0093] 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 with the first position end to conduct the loop between the target resonance module and the inverter module.

[0094] 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 resonance module, so that the active end of the switch module contacts the first position end, so that the loop between the target resonance module and the inverter module is turned on, and the path between the target resonance module and the selection module is disconnected.

[0095] S707, controlling the inverter module to send a driving pulse signal to the target resonant module.

[0096] The duty cycle of the driving pulse signal can be determined according to the power requirement of the electrical equipment, and this embodiment of the present application does not limit this.

[0097] In summary, the technical solution provided by the embodiment of the present application is to add an oscillation driving module, a gating module and a comparison module in the electromagnetic heating circuit. The oscillation driving module sends an oscillation driving signal to the target resonance module selected by the gating module for conduction. 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 and the capacitance of the entire circuit are determined by the inductance of the heating coil in the target resonant module, and the inductance of the heating coil in the target resonant module changes with whether a cooker 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 cooker is placed at the target position. The above-mentioned cooker 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 cooker 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 cooker is placed at the position corresponding to other resonant modules that are not in a heating state.

[0098] Please refer to Figure 8 , which shows a structural block diagram of a control device for an electrical device provided by an embodiment of the present application. The electrical device includes 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, an oscillation parameter determination module 840, and a cookware detection module 850.

[0099] The first control module 810 is used to control the movable end of the first switch module among the at least two switch modules to contact with the second position end.

[0100] The second control module 820 is used to determine the target resonance module among the resonance modules connected to the first switch module, and control the selection module to select and conduct the loop between the target resonance module and the oscillation driving module, and the oscillation driving module is used to send an oscillation driving signal to the target resonance module.

[0101] The result acquisition module 830 is used to acquire the comparison result output by the comparison module.

[0102] The oscillation parameter determination module 840 is used to 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.

[0103] The pot detection module 850 is used to determine whether a pot is placed at a target position corresponding to the target resonance module based on the oscillation parameters of the target resonance module.

[0104] In some embodiments, when the oscillation parameters of the target resonance module include an oscillation period, the oscillation parameter determination module 840 is used to determine the time interval between two adjacent rising edges in the comparison result as the oscillation period. The pot detection module 850 is used to determine that a pot is placed at the target position if the oscillation period is less than a specified time length; 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.

[0105] In some embodiments, when the oscillation parameters of the target resonance module include an oscillation frequency, the oscillation parameter determination module 840 is used to determine the time interval between two adjacent rising edges in the comparison result as the oscillation period; and determine the oscillation frequency according to the oscillation period. The pot detection module 850 is used to determine that a pot is placed at the target position if the oscillation frequency is greater than a specified frequency; and to determine that no pot is placed at the target position if the oscillation period is less than or equal to the specified frequency.

[0106] In some embodiments, the device includes: a third control module and a fourth control module (not shown in the figure). The third control module is used to control the active end of the switch module connected to the target resonance module to contact the first position end when it is determined that a pot is placed at the target position, so as to conduct the loop between the target resonance module and the inverter module. The fourth control module is used to control the inverter module to send a driving pulse signal to the target resonance module.

[0107] In some embodiments, the second control module 720 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.

[0108] In summary, the technical solution provided by the embodiment of the present application is to add an oscillation driving module, a gating module and a comparison module in the electromagnetic heating circuit. The oscillation driving module sends an oscillation driving signal to the target resonance module selected by the gating module for conduction. 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 and the capacitance of the entire circuit are determined by the inductance of the heating coil in the target resonant module, and the inductance of the heating coil in the target resonant module changes with whether a cooker 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 cooker is placed at the target position. The above-mentioned cooker 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 cooker 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 cooker is placed at the position corresponding to other resonant modules that are not in a heating state.

[0109] Those skilled in the art can 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.

[0110] In several embodiments provided in the present application, the coupling between modules may be electrical, mechanical or other forms of coupling.

[0111] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0112] like Fig. 9 As shown, the present application example further provides an electrical device 900, which includes a processor 910 and a memory 920. The memory 920 stores computer program instructions.

[0113] The processor 910 may include one or more processing cores. The processor 910 uses various interfaces and lines to connect various parts of the entire battery management system, and executes 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 calling data stored in the memory 920. Optionally, the processor 910 can be implemented in at least one hardware form of digital signal processing (DSP), field programmable gate array (FPGA), and programmable logic array (PLA). The processor 910 can integrate one or more combinations of a central processing unit 910 (CPU), a graphics processing unit 910 (GPU), and a modem. Among them, the CPU mainly processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing display content; and the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 910, but may be implemented separately through a communication chip.

[0114] The memory 920 may include a random access memory 920 (Random Access Memory, RAM), and may also include a read-only memory 920 (Read-Only Memory). 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, wherein 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 following various method examples, etc. The data storage area may also store data created by the electrical device during use, etc.

[0115] See also Fig.10 , which shows that an embodiment of the present application also provides a computer-readable storage medium 1000, in which computer program instructions 1010 are stored. The computer program instructions 1010 can be called by a processor to execute the method described in the above embodiment.

[0116] The computer-readable storage medium 1000 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk, or a 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 for executing any method steps in the above method. These computer program instructions 1010 may be read from or written to one or more computer program products. The computer program instructions 1010 may be compressed in an appropriate form.

[0117] The above are only preferred examples of the present application and are not intended to limit the present application in any form. Although the present application has been disclosed as the preferred examples above, they are not intended to limit the present application. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent examples with equivalent changes 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; The fixed ends of at least two of the switch modules are connected to at least two of the resonance modules in a one-to-one correspondence; 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; 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.

2. The circuit according to claim 1, 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.

3. The circuit according to claim 1, 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.

4. The circuit according to claim 1, 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 ends are connected to the second position ends of at least two of the switch modules in a one-to-one correspondence; The common end is connected to the oscillation driving module.

5. A control method for an electrical device, characterized in that: The electrical device comprises the electromagnetic heating circuit according to any one of claims 1 to 4, 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.

6. The method according to claim 5, 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.

7. The method according to claim 5, 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.

8. The method according to any one of claims 5 to 7, 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.

9. The method according to any one of claims 5 to 7, 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.

10. A control device for an electrical device, characterized in that: The electrical equipment comprises the electromagnetic heating circuit according to any one of claims 1 to 4, 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 result acquisition module, used to obtain the comparison result output by the comparison module; an oscillation parameter determination module, configured to determine an oscillation parameter of the target resonance module based on the comparison result, wherein the oscillation parameter of the target resonance module includes an oscillation period and / or an oscillation frequency; The cookware detection module is used 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.

11. An electrical device, characterized in that: The electrical device comprises an electromagnetic heating circuit as claimed in any one of claims 1 to 4; 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 5 to 9.

12. 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 5 to 9.

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