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 electromagnetic heating circuit comprises M inversion modules, N resonance modules, N first switches, N current detection modules and a control module. The first switch is provided with a first common end, a first movable end and M first position ends, the first movable end is connected with the first common end, and the M first position ends are connected to the output ends of the M inversion modules in a one-to-one correspondence mode. The current detection module is connected between the common end of the first switch and the resonance module. The control module is connected to the signal ends of the M inversion modules, the N first switches and the N current detection modules, and the control module can detect the first switch in an abnormal working state, so that the situation that multiple resonance modules covered by the same cookware adopt multiple different inversion modules for heating is avoided. And the service life of the electrical equipment is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and more specifically, to an electromagnetic heating circuit, a control method and device for electrical equipment, and electrical equipment. Background Art

[0002] The full-area multi-burner stove is an electromagnetic heating device with multiple coil disks built in. The multiple coil disks are evenly arranged inside the full-area multi-burner stove, so that the full-area multi-burner stove can heat multiple pots at the same time.

[0003] In order to avoid interference when heating multiple pots, multiple inverter modules are set inside the full-area multi-burner stove to provide alternating current for the coil disk. For example, when there are two pots, the coil disk covered by pot No. 1 uses the same inverter module, and the coil disk covered by pot No. 2 uses another inverter module. Therefore, the controller can control the two inverter modules separately to adjust the heating parameters of the two pots separately.

[0004] Therefore, a single coil disk is connected to multiple inverter modules through a switch. When the coil disk needs to be heated, the controller controls the switch to conduct the branch between the coil disk and one of the inverter modules. However, if the switch fails, a coil disk will be connected to the wrong inverter module, which will cause multiple coil disks covered by the same pot to be heated by multiple different inverter modules, resulting in inconsistent working frequencies of the multiple coil disks, causing the multi-burner stove in the entire area to be in an abnormal working state. Summary of the invention

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

[0006] In a first aspect, some embodiments of the present application provide an electromagnetic heating circuit, which includes M inverter modules, N resonance modules, N first switches corresponding to the N resonance modules one by one, N current detection modules corresponding to the N resonance modules one by one, and a control module, where M is an integer greater than 1, and N is an integer greater than 1. Among them, the inverter module is provided with a signal terminal and an output terminal. The first switch is provided with a first common terminal, a first active terminal, and M first position terminals, the first active terminal is connected to the first common terminal, and the M first position terminals are connected to the output terminals of the M inverter modules one by one. The current detection module is connected between the common terminal of the first switch and the resonance module. The control module is respectively connected to the signal ends of the M inverter modules, the N first switches and the N current detection modules, and the control module is configured to: determine the target resonance module among the N resonance modules, the target resonance module refers to the resonance module covered by the cookware; determine the target inverter module among the M inverter modules; turn on the branch between the target resonance module and the target inverter module; based on the drive pulse signal input to the target inverter module and the detection signal output by the current detection module corresponding to the target resonance module, determine whether the first switch corresponding to the target resonance module is in a normal working state; the detection signal is used to characterize the current change of the branch where the target resonance module is located.

[0007] In the second aspect, some embodiments of the present application also provide a control method for an electrical device, which includes the above-mentioned electromagnetic heating circuit, and the method includes: determining a target resonant module among N resonant modules, the target resonant module refers to the resonant module covered by the cookware; determining a target inverter module among M inverter modules; turning on the branch between the target resonant module and the target inverter module; based on the drive pulse signal input to the target inverter module and the detection signal output by the current detection module corresponding to the target resonant module, determining whether the first switch corresponding to the target resonant module is in a normal working state; the detection signal is used to characterize the current change of the branch where the target resonant module is located.

[0008] In a third aspect, some embodiments of the present application also provide a control device for an electrical device, the electrical device includes the above-mentioned electromagnetic heating circuit, and the device includes a first determination unit, a second determination unit, a conduction unit and a third determination unit. Among them, the first determination unit is used to determine the target resonance module among the N resonance modules, and the target resonance module refers to the resonance module covered by the cookware. The second determination unit is used to determine the target inverter module among the M inverter modules. The conduction unit is used to conduct the branch between the target resonance module and the target inverter module. The third determination unit is used to determine whether the first switch corresponding to the target resonance module is in a normal working state based on the drive pulse signal input to the target inverter module and the detection signal output by the current detection module corresponding to the target resonance module; the detection signal is used to characterize the current change of the branch where the target resonance module is located.

[0009] In a fourth aspect, an embodiment of the present application further provides an electrical device, which includes the above-mentioned electromagnetic heating circuit. Wherein, the control module in the electromagnetic heating circuit includes one or more processors, a memory, and one or more application programs. The one or more application programs are stored in the memory and are configured to be executed by one or more processors, and are configured to execute the above-mentioned method.

[0010] In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer program instructions, wherein the computer program instructions can be called by a processor to execute the above method.

[0011] In a sixth aspect, an embodiment of the present application further provides a computer program product, which implements the above method when executed.

[0012] The present application provides an electromagnetic heating circuit, a control method and device for an electrical device, and an electrical device. The electromagnetic heating circuit includes M inverter modules, N resonance modules, N first switches corresponding to the N resonance modules, N current detection modules corresponding to the N resonance modules, and a control module. The control module is respectively connected to the signal terminals of the M inverter modules, the N first switches, and the N current detection modules.

[0013] On the one hand, the control module can control the first switch to conduct the branch between the target resonant module and the target inverter module. On the other hand, the control module can output a drive pulse signal to the target inverter module to control the target inverter module to output an alternating current to the target resonant module. Then the control module can obtain a detection signal corresponding to the alternating current through the current detection module connected to the target resonant module, and determine whether the first switch is in a normal conduction state according to the detection signal and the drive pulse signal.

[0014] Specifically, when the branch between the target resonant module and the target inverter module is in the on state, the change trend of the drive pulse signal and the change trend of the detection signal are roughly synchronized, that is, the detection signal changes with the change of the drive pulse signal, which indicates that the first switch is in a normal working state. On the contrary, if the change trend of the drive pulse signal and the change trend of the detection signal are not synchronized, it means that the first switch has not turned on the branch between the target resonant module and the target inverter module, and the first switch is in an abnormal working state. In this case, the control module can stop controlling the target resonant module, thereby avoiding the situation where multiple resonant modules covered by the same pot are heated by multiple different inverter modules, thereby ensuring the service life of the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 It is a structural schematic diagram of an electrical device provided in an embodiment of the present application.

[0017] Figure 2 yes Figure 1 Schematic diagram of the electromagnetic heating circuit.

[0018] Figure 3 yes Figure 2 Schematic diagram of the inverter module.

[0019] Figure 4 yes Figure 2 Schematic diagram of the signal waveform corresponding to the electromagnetic heating circuit shown.

[0020] Figure 5 yes Figure 2 Schematic diagram of the structure of the resonance module.

[0021] Figure 6 yes Figure 2 Schematic diagram of the structure of the current detection module.

[0022] Figure 7 It is a flowchart of a control method for electrical equipment provided in the first embodiment of the present application.

[0023] Figure 8 It is a flow chart of a control method of an electrical device provided in the second embodiment of the present application.

[0024] Fig. 9 It is a flow chart of a control method of an electrical device provided in the third embodiment of the present application.

[0025] Fig.10 It is a module block diagram of a control device for an electrical device provided in an embodiment of the present application.

[0026] Fig.11 It is a module block diagram of the electrical equipment provided in the embodiment of the present application.

[0027] Fig.12 It is a module block diagram of the computer-readable storage medium provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] The present application provides an electromagnetic heating circuit, a control method and device for an electrical device, and an electrical device. The electromagnetic heating circuit includes M inverter modules, N resonance modules, N first switches corresponding to the N resonance modules, N current detection modules corresponding to the N resonance modules, and a control module. The control module is respectively connected to the signal terminals of the M inverter modules, the N first switches, and the N current detection modules.

[0031] On the one hand, the control module can control the first switch to conduct the branch between the target resonant module and the target inverter module. On the other hand, the control module can output a drive pulse signal to the target inverter module to control the target inverter module to output an alternating current to the target resonant module. Then the control module can obtain a detection signal corresponding to the alternating current through the current detection module connected to the target resonant module, and determine whether the first switch is in a normal conduction state according to the detection signal and the drive pulse signal.

[0032] Specifically, when the branch between the target resonant module and the target inverter module is in the on state, the change trend of the drive pulse signal and the change trend of the detection signal are roughly synchronized, that is, the detection signal changes with the change of the drive pulse signal, which indicates that the first switch is in a normal working state. On the contrary, if the change trend of the drive pulse signal and the change trend of the detection signal are not synchronized, it means that the first switch has not turned on the branch between the target resonant module and the target inverter module, and the first switch is in an abnormal working state. In this case, the control module can stop controlling the target resonant module, thereby avoiding the situation where multiple resonant modules covered by the same pot are heated by multiple different inverter modules, thereby ensuring the service life of the electrical equipment.

[0033] In order to facilitate the detailed description of the present application, the application environment of the embodiment of the present application is first introduced in conjunction with the accompanying drawings. The embodiment of the present application provides an electromagnetic heating circuit 100 and an electrical device 200 equipped with the electromagnetic heating circuit 100. Among them, the electrical device 200 is a device that heats a pot placed above the electrical device 200 based on the electromagnetic induction phenomenon. For example, the electrical device 200 can be a full-area multi-burner stove, an induction cooker, etc.

[0034] See also Figure 1 The electrical device 200 may include a housing 210, a function panel 230, and an electromagnetic heating circuit 100, and the electromagnetic heating circuit 100 may include a plurality of coils 250. The function panel 230 is disposed on the outer surface of the housing 210, and is used to receive control operations of the user. The electromagnetic heating circuit 100 is disposed inside the housing 210, and the electromagnetic heating circuit 100 and the function panel 230 are electrically connected, and are used to work according to the control operations received by the function panel 230 (for example, controlling one or more coils 250 in the electromagnetic heating circuit 100 to heat). For example, the above-mentioned control operations may include a start operation, a timing operation, a heating mode selection operation, and the like.

[0035] In some possible embodiments, the housing 210 may include a first housing portion (not shown in the figure) and a second housing portion (not shown in the figure), and the first housing portion and the second housing portion cover each other to form a storage space for placing the electromagnetic heating circuit 100, that is, the housing 210 can protect and store the electromagnetic heating circuit 100. Among them, a fixing structure may be provided in the first housing portion, and the fixing structure is used to fix part of the structure of the electromagnetic heating circuit 100. Specifically, the fixing structure includes but is not limited to structures such as a fixing groove, a clamp (for example, an elastic buckle). The outer surface of the second housing portion is provided with an installation groove, and the installation groove is used to install the functional panel 230.

[0036] The function panel 230 may be a touch screen, which may be provided with one or more virtual controls. The function panel 230 may also include one or more physical buttons, which, when triggered by a user's control operation, generate corresponding control signals to instruct the electromagnetic heating circuit 100 to work.

[0037] The coil 250 is used to generate an alternating magnetic field with a continuously changing direction under the excitation of an alternating current, so that an eddy current is generated in a metal conductor (for example, a pot placed on the electrical device 200) in the alternating magnetic field, and then the metal conductor is heated up under the action of the eddy current to cook the food placed inside it.

[0038] In this embodiment, the number of coils 250 can be multiple, and the multiple coils 250 are arranged inside the housing 210 in a certain arrangement, so that when the pot is placed on the electrical device 200, some of the coils 250 are used to heat it. Therefore, the pot can be placed on the electrical device 200 more flexibly. Specifically, the number of coils 250 can be greater than or equal to 30, for example, the number of coils 250 is 40, 60, 80, etc. Figure 1 In the illustrated embodiment, the number of the coils 250 is 50, and the 50 coils 250 are arranged in 10 columns, and the 10 columns of coils 250 are arranged in sequence and spaced apart in the length direction of the electrical device 200. Figure 1 The dotted coil 270 in the figure is a possible placement position of the cookware. When the cookware is placed in this position, there are coils 1, 2, 6, 7, 8, 12 and 13 to heat it.

[0039] The electromagnetic heating circuit 100 is used to control the coil 250 to work. Specifically, there may be multiple electromagnetic heating circuits 100, and the multiple electromagnetic heating circuits 100 are used to control some of the coils 250 in the multiple coils 250 respectively. Figure 1 In the embodiment shown, there are two electromagnetic heating circuits 100, each of which is used to control 25 coils. Specifically, one electromagnetic heating circuit 100 controls coils No. 1 to No. 25, and the other electromagnetic heating circuit 100 controls coils No. 26 to No. 50.

[0040] See also Figure 2 The electromagnetic heating circuit 100 may include M inverter modules 10, N resonant modules 30, N first switches 40 corresponding to the N resonant modules 30, N current detection modules 50 corresponding to the N resonant modules 30, and a control module 60, where M is an integer greater than 1 and N is an integer greater than 1. The inverter module 10 may be provided with a signal terminal 120 and an output terminal 140. The first switch 40 may be provided with a first common terminal 410, a first active terminal 430 and M first position terminals 450, the first active terminal 430 is connected to the first common terminal 410, and the M first position terminals 450 are connected to the output terminals 140 of the M inverter modules 10 in a one-to-one correspondence. The current detection module 50 is connected between the common terminal 410 of the first switch 40 and the resonant module 30. The control module 60 is respectively connected to the signal terminal 120 of the M inverter modules 10, the N first switches 40 and the N current detection modules 50.

[0041] On the one hand, the control module 60 can control the first switch 40 to conduct the branch between the target resonant module and the target inverter module. On the other hand, the control module 60 can output a drive pulse signal to the target inverter module to control the target inverter module to output an alternating current to the target resonant module. Then the control module 60 can obtain a detection signal corresponding to the alternating current through the current detection module 50 connected to the target resonant module, and determine whether the first switch 40 is in a normal conduction state according to the detection signal and the drive pulse signal.

[0042] Specifically, when the branch between the target resonance module and the target inverter module is in the on state, the change trend of the drive pulse signal and the change trend of the detection signal are roughly synchronized, that is, the detection signal changes with the change of the drive pulse signal, and at this time it is indicated that the first switch 40 is in a normal working state. On the contrary, if the change trend of the drive pulse signal and the change trend of the detection signal are not synchronized, it means that the first switch 40 has not turned on the branch between the target resonance module and the target inverter module, and the first switch 40 is in an abnormal working state. In this case, the control module 60 can stop controlling the target resonance module, thereby avoiding the situation where multiple resonance modules covered by the same pot are heated by multiple different inverter modules, and ensuring that the electrical device 200 can be in a normal working state.

[0043] The specific implementation of each module in the electromagnetic heating circuit 100 is introduced below.

[0044] In this embodiment, the inverter module 10 is used to output an alternating current to the resonance module 30, so that the coil in the resonance module 30 generates an alternating magnetic field, thereby heating the pot placed in the alternating magnetic field. There are M inverter modules 10, where M is an integer greater than 1, for example, M can be equal to 2, 3, 4, etc. In this embodiment, the value of M is equal to the number of pots that can be heated simultaneously on the electromagnetic heating circuit 100. Figure 1 In the embodiment shown, two pots can be placed on the 25 coils 250 corresponding to the electromagnetic heating circuit 100 at the same time, and the number of inverter modules 10 can be two. Therefore, when two pots need to be heated at the same time, different inverter modules 10 can independently control the multiple coils covered by different pots, and the multiple coils covered by the same pot are controlled by the same inverter module 10, so that the two pots can be heated independently.

[0045] Therefore, in this embodiment, the driving pulse signals output by the control module 60 to different inverter modules 10 are not the same, and the control module 60 can adjust the heating power of different cookware by adjusting the signal parameters (for example, duty cycle) of the driving pulse signal.

[0046] In some possible embodiments, the inverter module 10 may be an inverter circuit (eg, a single-phase half-bridge inverter circuit, a single-phase full-bridge inverter circuit, etc.). Figure 3 The number of signal terminals 120 of the inverter module 10 is two, and the two signal terminals 120 include a first signal terminal 1210 and a second signal terminal 1230. The first signal terminal 1210 and the second signal terminal 1230 are respectively connected to the control module 60. The first signal terminal 1210 can be used to input a first pulse signal PWM_H, and the second signal terminal 1230 can be used to input a second pulse signal PWM_L. The first pulse signal PWM_H and the second pulse signal PWM_L are a pair of complementary pulse width modulation (PWM) signals, that is, when the first pulse signal PWM_H is at a high level, the second pulse signal PWM_L is at a low level, and when the first pulse signal PWM_H is at a low level, the second pulse signal PWM_L is at a high level. Please refer to Figure 4 , Figure 4 Part (a) is the waveform curve of the first pulse signal PWM_H. Figure 4 Part (b) is the waveform curve of the second pulse signal PWM_L.

[0047] Please refer again Figure 3 The inverter module 10 may include a first switch tube Q1, a second switch tube Q2, a first resonant absorption capacitor CM1, and a second resonant absorption capacitor CM2. The first end 11 of the first switch tube Q1 is connected to the third power supply terminal 21, the control end 12 of the first switch tube Q1 is connected to the first signal terminal 1210, and the second end 13 of the first switch tube Q1 is connected to the first end 15 of the second switch tube Q2. The control end 16 of the second switch tube Q2 is connected to the second signal terminal 1230, and the second end 17 of the second switch tube Q2 is grounded. Specifically, the first switch tube Q1 and the second switch tube Q2 may be insulated-gate bipolar transistors (IGBTs), respectively, wherein the first end 11 of the first switch tube Q1 and the first end 15 of the second switch tube Q2 are collectors of the IGBT, the control end 12 of the first switch tube Q1 and the control end 16 of the second switch tube Q2 are gates of the IGBT, and the second end 13 of the first switch tube Q1 and the second end 17 of the second switch tube Q2 are emitters of the IGBT. Therefore, the inverter module 10 in this embodiment adopts the structure of a single-phase half-bridge inverter circuit, and the first switch tube Q1 and the second switch tube Q2 can be in a complementary conduction state under the control of the first pulse signal PWM_H and the second pulse signal PWM_L. The third power supply terminal 21 is used to provide a DC voltage VBUS, and the DC voltage VBUS can be a voltage after the mains voltage is rectified by a rectifier circuit, that is, the amplitude of the DC voltage VBUS can be 220V.

[0048] The first resonant absorption capacitor CM1 is connected between the first end 11 and the second end 13 of the first switch tube Q1. The second resonant absorption capacitor CM2 is connected between the first end 15 and the second end 17 of the second switch tube Q2. The first resonant absorption capacitor CM1 can be used to absorb the peak voltage at the first switch tube Q1 to prevent the first switch tube Q1 from being damaged. The second resonant absorption capacitor CM2 can be used to absorb the peak voltage at the second switch tube Q2 to prevent the second switch tube Q2 from being damaged.

[0049] In this embodiment, the resonance module 30 is used to generate an alternating magnetic field under the excitation of an alternating current. Figure 5 , the resonance module 30 may include a coil LX, a first resonance capacitor CX1 and a second resonance capacitor CX2. Among them, one end of the first resonance capacitor CX1 and the second resonance capacitor CX2 connected in series is connected to the third power supply terminal 21, and the other end is grounded. The first end 31 of the coil LX is connected to the current detection module 50, and the second end 32 is connected to the common end of the first resonance capacitor CX1 and the second resonance capacitor CX2. Specifically, when the branch between the resonance module 30 and one of the inverter modules 10 is turned on, when the first switch tube Q1 in the inverter module 10 is turned on, the coil LX and the second resonance capacitor CX2 resonate; when the second switch tube Q2 in the inverter module 10 is turned on, the coil LX and the first resonance capacitor CX1 resonate.

[0050] It should be noted here that the coil LX in the resonance module 30 is Figure 1 Therefore, in this embodiment, the resonance module 30 and the coil 250 are in a one-to-one correspondence. Therefore, when the electromagnetic heating circuit 100 is used to control 25 coils 250, the number of the resonance modules 30 is also 25, that is, N is 25.

[0051] In this embodiment, the first switch 40 is connected between M inverter modules 10 and the resonance module 30, and is used to conduct the branch between one of the inverter modules 10 and the resonance module 30. Among them, the first switch 40 can be provided with a first common terminal 410, a first active terminal 430 and M first position terminals 450, the first active terminal 430 is connected to the first common terminal 410, the M first position terminals 450 are connected to the output terminals 140 of the M inverter modules 10 one by one, and the first common terminal 410 is connected to the resonance module 30 corresponding to the first switch 40. Therefore, when the first active terminal 430 is connected to different output terminals 140, the first switch 40 can conduct the branch between different inverter modules 10 and the resonance module 30 connected to the first switch 40. Specifically, the first switch 40 can be a relay switch, for example, a single-pole multi-throw relay. When the value of M is 2, the first switch 40 can be a single-pole double-throw relay.

[0052] In this embodiment, the current detection module 50 is connected between the common end of the first switch 40 and the resonance module 30, and is used to obtain a detection signal, which is used to characterize the current change of the branch where the resonance module 30 is located. Figure 6 The current detection module 50 may include a current detection unit 520, a voltage conversion unit 540 and a voltage comparison unit 560. The input terminal 5200 of the current detection unit 520 is connected between the common terminal 410 of the first switch 40 and the resonance module 30, and is used to obtain the current signal of the branch where the resonance module 30 is located.

[0053] The input end 5200 of the current detection unit 520 may include a first input end 5201 and a second input end 5203, wherein the first input end 5201 is connected to the common end 410 of the first switch 40, and the second input end 5203 is connected to the first end 31 of the coil LX in the resonance module 30. Therefore, the current detection unit 520 is connected in series in the branch where the resonance module 30 is located through the first input end 5201 and the second input end 5203, and it can obtain the current signal of the branch where the resonance module 30 is located. Please refer to Figure 4 , Figure 4 Part (c) in the figure is the waveform diagram corresponding to the current signal. It is not difficult to see from the current waveform diagram that the current in the branch where the resonance module 30 is located is an alternating current, that is, under the control of the first pulse signal PWM_H and the second pulse signal PWM_L, the current direction is constantly changing. Specifically, under the control of the first pulse signal PWM_H, the current direction is in the positive direction, and the current amplitude is greater than 0; under the control of the second pulse signal PWM_L, the current direction is in the reverse direction, and the current amplitude is less than 0.

[0054] The output terminal 5220 of the current detection unit 520 is used to output the current signal converted by the current detection unit 520. Specifically, the current detection unit 520 can be a current transformer. It should be noted here that since the inverter module 10 and the resonance module 30 are respectively connected to the mains, the current value of the branch where the resonance module 30 is located is relatively large, so it is necessary to reduce the current value through a current transformer to match the subsequent circuit. Among them, the output terminal 5220 of the current detection unit 520 may include a first output terminal 5221 and a second output terminal 5223, and the first output terminal 5221 is connected to the first power supply terminal 23. The first power supply terminal 23 is used to provide a first power supply voltage VDD1, and the first power supply voltage VDD1 is a DC voltage. For example, the amplitude of the first power supply voltage VDD1 can be 2.5V, 3V, etc.

[0055] The voltage conversion unit 540 is connected between the output terminal 5220 of the current detection unit 520 and the positive phase input terminal 5600 of the voltage comparison unit 560, and is used to convert the current signal output by the current detection unit 520 into a voltage signal. Specifically, the voltage conversion unit 540 may include a first resistor R1 and a second resistor R2. The first resistor R1 is connected between the first output terminal 5221 and the second output terminal 5223. The first resistor R1 can convert the current signal output by the current detection unit 520 into a voltage signal across the first resistor R1, and then under the action of the first power supply voltage VDD1 input at the first output terminal 5221, the input voltage at the positive phase input terminal 5600 of the voltage comparison unit 560 is the superposition voltage of the first power supply voltage VDD1 and the voltage across the first resistor R1. The second resistor R2 is connected between the second output terminal 5223 and the positive phase input terminal 5600 of the voltage comparison unit 560. The second resistor R2 can play a current limiting role to prevent the current at the positive phase input terminal of the voltage comparison unit 560 from being too large.

[0056] Please refer again Figure 4 , Figure 4 Part (d) in the figure is a waveform diagram of the input voltage of the positive phase input terminal 5600 of the voltage comparison unit 560. Since the first resistor R1 is a pure resistive load, the change trend of the voltage on both sides of the first resistor R1 is consistent with the change trend of the current in the branch where the resonance module 30 is located. In addition, under the action of the first power supply voltage VDD1, the voltage on both sides of the first resistor R1 is pulled up as a whole by the voltage value corresponding to the first power supply voltage VDD1 and then input to the positive phase input terminal 5600. Specifically, when the current amplitude of the branch where the resonance module 30 is located is greater than 0, the amplitude of the input voltage of the positive phase input terminal 5600 is greater than VDD1; when the current amplitude of the branch where the resonance module 30 is located is less than 0, the amplitude of the input voltage of the positive phase input terminal 5600 is less than VDD1.

[0057] In this embodiment, the voltage conversion unit 540 may further include a third resistor R3, one end of the third resistor R3 is connected to the non-inverting input terminal 5600 of the voltage comparison unit 560, and the other end of the third resistor R3 is connected to the second power supply terminal 25, and the second power supply voltage VDD2 output by the second power supply terminal 25 is greater than the power supply voltage VDD1 output by the first power supply terminal 23. Specifically, the second power supply voltage VDD2 is a DC voltage, for example, the amplitude of the second power supply voltage VDD2 can be 5V, 6.5V, etc. In this embodiment, by setting the third resistor R3 at the non-inverting input terminal 5600, and the second power supply voltage VDD2 input by the third resistor R3 is greater than the power supply voltage VDD1, it can be ensured that the input voltage of the non-inverting input terminal 5600 is always greater than 0, thereby ensuring the working stability of the voltage comparison unit 560.

[0058] The inverting input terminal 5620 of the voltage comparison unit 560 is connected to the first power supply terminal 23, so the input voltage of the inverting input terminal 5620 is the first power supply voltage VDD1. The output terminal 5640 of the voltage comparison unit 560 is connected to the control module 60, which is used to output a detection signal to the control module 60. Specifically, the voltage comparison unit 560 can be a voltage comparator, which is used to compare the voltage between the positive input terminal 5600 and the inverting input terminal 5620. When the input voltage of the positive input terminal 5600 is greater than the input voltage of the inverting input terminal 5620, the output terminal 5640 of the voltage comparator can output a high level signal; when the input voltage of the positive input terminal 5600 is less than the input voltage of the inverting input terminal 5620, the output terminal 5640 of the voltage comparator can output a low level signal. Please refer again Figure 4 , Figure 4 Part (e) is a waveform diagram of the output signal (ie, the detection signal) of the output terminal 5640, and the waveform of the output signal is a square wave.

[0059] Therefore, in this embodiment, the current signal of the branch where the resonance module 30 is located can be converted into a square wave signal (that is, a detection signal) by setting the current detection module 50. When the amplitude of the current signal is greater than 0, the square wave signal is at a high level, and when the amplitude of the current signal is less than 0, the square wave signal is at a low level.

[0060] It should be noted that, since the coil LX in the resonance module 30 is an inductive load, the current signal of the branch where the resonance module 30 is located will lag behind the driving pulse signal. Figure 4It is not difficult to see that when the first pulse signal PWM_H changes from a low level to a high level, the current signal of the branch where the resonance module 30 is located does not change from a negative value to a positive value synchronously, but changes to a positive value after a delay of a period of time t1, so that the output signal of the output terminal 5640 of the voltage comparison unit 560 also changes from a low level to a high level after a delay of a period of time t1.

[0061] In some possible embodiments, the current detection module 50 may further include a fourth resistor R4, one end of the fourth resistor R4 is connected to the output terminal 5640 of the voltage comparison unit 560, and the other end of the fourth resistor R4 is connected to the first power supply terminal 2600. The fourth resistor R4 in this embodiment is an output pull-up resistor, which is used to ensure the normal output of the detection signal.

[0062] In some possible embodiments, the current detection module 50 may further include a capacitor C, which is connected between the positive input terminal 5600 and the negative input terminal 5620 of the voltage comparison unit 560. The capacitor C can filter the instantaneously changing voltage to avoid misjudgment of the voltage comparison unit 560 when the input voltage of the positive input terminal 5600 or the input voltage of the negative input terminal 5620 suddenly changes, thereby ensuring the normal output of the detection signal.

[0063] In this embodiment, the electromagnetic heating circuit 100 may also include N second switches 70 and N pot detection modules 80 corresponding to the N resonance modules 30, and the control module 60 is also connected to the N second switches 70 and the N pot detection modules 80, respectively. Among them, the pot detection module 80 is used to detect whether the resonance module 30 is covered by the pot. Specifically, when the resonance module 30 corresponding to the pot detection module 80 is covered by the pot, the inductance value of the coil LX in the resonance module 30 will change. The pot detection module 80 can output pot detection signals of different frequencies to the control module 60 based on the change of the coil inductance value, and the control module 60 further determines whether the resonance module 30 is covered by the pot based on the above-mentioned pot detection signal. This embodiment does not limit the specific implementation method of the pot detection module 80.

[0064] The second switch 70 may be provided with a second common terminal 720, a second active terminal 740, a second position terminal 760 and a third position terminal 780, the second active terminal 740 is connected to the second common terminal 720, the second common terminal 720 is connected to the current detection module 50, the second position terminal 760 is connected to the signal output terminal 810 of the pot detection module 80, and the third position terminal 780 is connected to the first common terminal 410 of the first switch 40. Therefore, in this embodiment, the first switch 40, the second switch 70, the current detection module 50 and the resonance module 30 corresponding to each other are sequentially connected in series.

[0065] When the second active end 740 and the second position end 760 are connected, the branch between the pot detection module 80 and the resonance module 30 is turned on, and the resonance module 30 is in the pot detection state. When the control module 60 determines that the resonance module 30 is covered by the pot, the second active end 740 and the third position end 780 can be controlled to be connected, so that one of the inverter modules 10 can provide an alternating current to the resonance module 30, and the resonance module 30 is in the heating state. Specifically, the second switch 70 can be a relay switch, for example, a single-pole double-throw relay.

[0066] In this embodiment, the control module 60 is respectively connected to the signal terminals of the M inverter modules 10, the N first switches 40 and the N current detection modules 50. On the one hand, the control module 60 can control the first switch 40 to conduct the branch between the target resonant module and the target inverter module. On the other hand, the control module 60 can output a drive pulse signal to the target inverter module to control the target inverter module to output an alternating current to the target resonant module. Then, the control module 60 can obtain the detection signal corresponding to the alternating current through the current detection module 50 connected to the target resonant module, and judge whether the first switch 40 is in a normal conduction state according to the detection signal and the drive pulse signal. Specifically, the control module 60 can be a control chip, an integrated circuit board and other structures, and the specific control process of the control module 60 is described in detail in the method embodiment below.

[0067] The control method applied to the above-mentioned electrical device 200 is introduced below.

[0068] See also Figure 7 , Figure 7 A control method for an electrical device provided in the first embodiment of the present application is schematically shown. Specifically, the method includes the following process.

[0069] Step S710: determining a target resonance module among N resonance modules.

[0070] In this embodiment, the target resonance module refers to the resonance module covered by the cookware, and the "resonance module covered by the cookware" here means that at least part of the structure of the coil in the resonance module is covered by the cookware. In this case, the resonance module needs to heat the cookware. Specifically, the specific implementation method of the control module determining the target resonance module among the N resonance modules is described in the following embodiments.

[0071] Step S720: determining a target inverter module among the M inverter modules.

[0072] In this embodiment, the target inverter module refers to an inverter module that provides alternating current to the target resonance module. The control module can determine the target inverter module among the M inverter modules according to the pot state of the cookware. Among them, the pot state can include an unheated state and a heated state. As an implementation method, a temperature sensing device can be provided on the electrical equipment, and the control module can obtain the bottom temperature of the cookware according to the temperature sensing device, and determine the pot state of the cookware based on the bottom temperature of the cookware. For example, if the bottom temperature of the cookware is less than a specified temperature (for example, 30 degrees Celsius), it means that the pot state is an unheated state; if the bottom temperature of the cookware is greater than a specified temperature, it means that the pot state is a heated state. Specifically, the temperature sensing device can be a temperature sensor.

[0073] As an implementation mode, when the cooker is in an unheated state, it indicates that the cooker is a newly added cooker on the electrical equipment. The control module can determine whether the M inverter modules are in a working state, and then determine any one of the M inverter modules that is not in a working state as the target inverter module.

[0074] As another implementation, when the pot is in the heated state, it indicates that the pot has been heated for a period of time on the electrical device, and when the user moves the pot, some resonance modules that are not in the heated state are covered by the pot and become the target resonance modules. In this case, the control module can determine whether the resonance module at the adjacent position of the target resonance module is in the heated state. If the resonance module at the adjacent position is in the heated state, the inverter module corresponding to the resonance module is determined as the target inverter module to ensure that multiple resonance modules covered by the same pot are heated by the same inverter module.

[0075] In some other possible embodiments, the control module can directly determine whether the resonant module at an adjacent position to the target inverter module is in a heating state. If the working state of the resonant module at the adjacent position is in a heating state, the inverter module corresponding to the resonant module is determined as the target inverter module; if the working state of the resonant module at the adjacent position is not in a heating state, any one of the M inverter modules that is not in a working state is determined as the target inverter module.

[0076] Step S730, turning on the branch between the target resonant module and the target inverter module.

[0077] In this embodiment, the control module may control the switch of the branch where the target resonant module is located to turn on the branch between the target resonant module and the target inverter module.

[0078] Step S740: determining whether the first switch corresponding to the target resonant module is in a normal working state based on the driving pulse signal input to the target inverter module and the detection signal output by the current detection module corresponding to the target resonant module.

[0079] Here, the "working state of the first switch" is explained first. Since the electromagnetic heating circuit where the first switch is located may have an overtemperature phenomenon, or the branch between the first switch and the control module is broken, so that the control module cannot control the first switch to conduct the branch between the target resonant module and the target inverter module, it means that the first switch is in an abnormal working state. On the contrary, if the control module can smoothly control the first switch so that the branch between the target resonant module and the target inverter module is conducted, it means that the first switch is in a normal working state.

[0080] In this embodiment, the detection signal is used to characterize the current change of the branch where the target resonant module is located. Since the branch between the target resonant module and the target inverter module is in a conductive state, the change trend of the drive pulse signal and the change trend of the detection signal are roughly synchronized, that is, the detection signal changes with the change of the drive pulse signal, which indicates that the first switch is in a normal working state. On the contrary, if the change trend of the drive pulse signal and the change trend of the detection signal are not synchronized, it means that the first switch has not turned on the branch between the target resonant module and the target inverter module, and the first switch is in an abnormal working state.

[0081] Therefore, the control module can determine whether the first switch corresponding to the target resonant module is in a normal working state based on the drive pulse signal input to the target inverter module and the detection signal output by the current detection module corresponding to the target resonant module. Specifically, the specific implementation method of the control module determining whether the first switch is in a normal working state is described in the following embodiments.

[0082] This embodiment provides a control method for an electrical device, and the control module can determine whether the first switch is in a normal working state based on the method. If the first switch is in an abnormal working state, the control module can stop controlling the target resonance module, which can avoid the situation where multiple resonance modules covered by the same pot are heated by multiple different inverter modules, thereby ensuring the service life of the electrical device.

[0083] See also Figure 8 , Figure 8A control method for an electrical device provided by the second embodiment of the present application is schematically shown. In the method, there are two drive pulse signals, and the two drive pulse signals include a complementary first pulse signal and a second pulse signal. When the amplitude of the first pulse signal is greater than 0, the amplitude of the detection signal is greater than 0; when the amplitude of the second pulse signal is greater than 0, the amplitude of the detection signal is equal to 0. Specifically, the method includes the following process.

[0084] Step S810: determining a target resonance module among N resonance modules.

[0085] Step S820: determining a target inverter module among the M inverter modules.

[0086] Step S830, turning on the branch between the target resonant module and the target inverter module.

[0087] Step S840: determining whether the first switch corresponding to the target resonant module is in a normal working state based on the driving pulse signal input to the target inverter module and the detection signal output by the current detection module corresponding to the target resonant module.

[0088] In this embodiment, step S840 may include step S8400.

[0089] Step S8400: Based on the first pulse signal and the detection signal, determine whether the first switch corresponding to the target resonant module is in a normal working state.

[0090] Please refer again Figure 4 , the first pulse signal corresponds to Figure 4 In part (a), the detection signal corresponds to Figure 4 In part (e), when the first switch turns on the branch between the target resonant module and the target inverter module, the change trend of the first pulse signal and the change trend of the detection signal are roughly synchronized, that is, when the first pulse signal outputs a square wave pulse, the detection signal will also output a square wave pulse almost at the same time. In addition, due to the hysteresis of the coil in the target resonant module, the square wave pulse corresponding to the detection signal will lag behind the square wave pulse corresponding to the first pulse signal by a certain length in the same cycle, that is, Figure 4 Therefore, the control module can determine whether the first switch corresponding to the target resonance module is in a normal working state based on the above characteristics, the first pulse signal and the detection signal. Specifically, step S8400 can include steps S8410 to S8430.

[0091] Step S8410, obtaining the first moment of the first pulse signal in a specified signal period.

[0092] In this embodiment, the first moment is the moment when the first pulse signal changes from a low level to a high level. The specified signal period may be the time interval corresponding to the change of two adjacent square wave pulses in the first pulse signal from a low level to a high level, that is, Figure 4 The time interval T in part (a).

[0093] Since the first pulse signal in this embodiment is a control signal generated inside the control module, the control module can determine the first moment of the first pulse signal in the specified signal period by obtaining the signal parameters of the first pulse signal (for example, the starting sending time, the signal period, etc.).

[0094] Step S8420, obtaining the detection signal at the second moment of the specified signal period.

[0095] In this embodiment, the second moment is the moment when the detection signal changes from a low level to a high level. The second moment is later than the first moment, and the second moment and the first moment correspond to the same designated signal cycle.

[0096] Specifically, the control module can sample the detection signal within a specified signal period. If the detection signal values ​​corresponding to two adjacent sampling moments are different, and the detection signal value corresponding to the latter sampling moment is greater than the detection signal value corresponding to the previous sampling moment, then any one of the two adjacent sampling moments can be determined as the second moment, or the average of the moments corresponding to the two adjacent sampling moments can be determined as the second moment.

[0097] Step S8430: When the difference between the second moment and the first moment is less than or equal to a specified value, it is determined that the first switch corresponding to the target resonance module is in a normal working state.

[0098] In this embodiment, the specified value may be a default value in the control module, or may be adjusted by the R&D personnel based on the actual working conditions of the electrical equipment. For example, the specified value may be 0.1ms, 0.05ms, etc. When the difference between the second moment and the first moment of the control module is less than or equal to the specified value, it indicates that the first pulse signal and the detection signal are almost simultaneously changed from a low level to a high level, indicating that the branch between the target resonant module and the target inverter module is in a conducting state, that is, the first switch corresponding to the target resonant module is in a normal working state.

[0099] In some possible embodiments, step S8440 and step S8450 are also included after step S8420.

[0100] Step S8440: When the difference between the second moment and the first moment is greater than a specified value, stop sending the drive pulse signal to the target inverter module.

[0101] In this embodiment, when the difference between the second moment and the first moment of the control module is greater than the specified value, it means that the change trend of the detection signal and the change trend of the first pulse signal are not synchronized, which means that the first switch does not conduct the branch between the target resonant module and the target inverter module, but conducts the branch between the target resonant module and other inverter modules. At this time, the first switch is in an abnormal working state. In this case, the control module stops sending the drive pulse signal to the target inverter module.

[0102] Step S8450: Control the second switch corresponding to the target resonant module to disconnect the branch between the target resonant module and the target inverter module.

[0103] In this embodiment, since the second switch disconnects the branch between the target resonant module and the target inverter module, no inverter module can provide alternating current to the target resonant module to stop heating the target resonant module. This can avoid the situation where multiple resonant modules covered by the same cookware are heated by multiple different inverter modules, thereby ensuring the service life of the electrical equipment.

[0104] As a possible implementation, after executing step S8450, the control module may also generate an alarm message and send the alarm message to the function panel for display, or send the alarm message to a mobile terminal (e.g., a smart phone) that is connected to the electrical device to remind the user to repair the electrical device. For example, the content of the alarm message may be "The circuit is faulty, please repair it."

[0105] As another possible implementation, after executing step S8450, the control module may also generate a fault record, which may be stored in the control module to help maintenance personnel quickly locate the faulty hardware when they are performing maintenance. For example, the content of the fault record may be "at XX time, the first switch corresponding to coil No. X failed".

[0106] As another possible implementation, the failure of the first switch may be caused by the excessive temperature of the electromagnetic heating circuit where the first switch is located. After executing step S8450, the control module can re-open the branch between the target resonant module and the target inverter module at specified intervals, and again determine whether the first switch corresponding to the target resonant module is in a normal working state, that is, the control module re-executes steps S830 and S840. Among them, the specified duration can be a default value in the control module, and can also be adjusted by the R&D personnel based on the cooling time required for the electromagnetic heating circuit. For example, the specified duration can be 30s, 60s, and so on.

[0107] This embodiment provides a control method for an electrical device, which describes in detail how the control module determines whether the first switch is in a normal working state based on the drive pulse signal and the detection signal. If the first switch is in an abnormal working state, the control module can stop controlling the target resonance module, which can avoid the situation where multiple resonance modules covered by the same pot are heated by multiple different inverter modules, thereby ensuring the service life of the electrical device.

[0108] See also Fig. 9 , Fig. 9 A control method for an electrical device provided in the third embodiment of the present application is schematically shown. Specifically, the method includes the following process.

[0109] Step S910: determining a target resonance module among N resonance modules.

[0110] In some possible embodiments, the N resonance modules are connected to the N pot detection modules in a one-to-one correspondence, and the control module can determine the target resonance module among the N resonance modules through the pot detection signals sent by the N pot detection modules. Specifically, step S910 may include step S9100 and step S9120.

[0111] Step S9100, receiving N pot detection signals sent by N pot detection modules.

[0112] In this embodiment, the signal frequency of the pot detection signal corresponds to the equivalent inductance value of the coil in the resonance module connected to the pot detection module. When the resonance module is covered with a pot, the equivalent inductance value of the coil in the resonance module is related to the distance between the pot and the coil. As the distance between the pot and the heating coil increases, the equivalent inductance value of the coil also gradually increases. As the distance between the pot and the coil decreases, the equivalent inductance value of the coil also decreases. Specifically, the signal frequency of the pot detection signal can be determined according to the following frequency calculation formula.

[0113]

[0114] Among them, f is the signal frequency of the pot detection signal, L is the equivalent inductance value of the pot detection module, and C is the equivalent capacitance value of the pot detection module. When the equivalent inductance value of the coil decreases, the equivalent inductance value of the pot detection module will also decrease, making the signal frequency of the pot detection signal larger.

[0115] In some possible embodiments, when the resonance module is not covered by the cookware, the signal frequency of the pot detection signal may be a first frequency, and when the resonance module is covered by the cookware, the signal frequency of the pot detection signal may be a second frequency, wherein the second frequency is greater than the first frequency, so that the control module can determine whether the resonance module is covered by the cookware based on the change in the signal frequency of the pot detection signal.

[0116] As an implementation method, the control module may receive N pot detection signals sent by N pot detection modules at preset time intervals. The preset time may be a default value in the control module, or may be adjusted by R&D personnel based on the actual working conditions of the electrical device. For example, the preset time may be 1s, 10s, etc.

[0117] As another implementation, the control module can receive N pot detection signals sent by N pot detection modules when the electrical device is in working state and receives the control signal sent by the function panel. For example, the control signal can be a heating mode selection signal. When the control module receives the control signal, it is likely that a pot to be heated is placed on the electrical device, and then receives N pot detection signals sent by N pot detection modules.

[0118] Step S9120: determine the resonance module corresponding to the target pot detection signal among the N pot detection signals as the target resonance module.

[0119] In this embodiment, the target pot detection signal indicates that the resonance module corresponding to the pot detection module is covered by the pot. As an implementation mode, when the signal frequency of the pot detection signal is greater than the specified frequency, the control module determines that the pot detection signal is the target pot detection signal, and then determines the resonance module corresponding to the target pot detection signal as the target resonance module. Specifically, the specified frequency can be the default value in the control module, and can also be adjusted by the R&D personnel based on the actual working conditions of the electromagnetic heating circuit, which is not specifically limited in this embodiment.

[0120] Step S920: determining a target inverter module among the M inverter modules.

[0121] Step S930, turning on the branch between the target resonant module and the target inverter module.

[0122] In this embodiment, the branch between the target resonant module and the target inverter module is provided with a first switch and a second switch. Specifically, step S930 may include step S9310 and step S9320.

[0123] Step S9310: Control the second switch corresponding to the target resonant module to turn on the branch between the target resonant module and the first switch.

[0124] Step S9320: Control the first switch corresponding to the target resonant module to turn on the branch between the target resonant module and the target inverter module.

[0125] In this embodiment, the control module first controls the second switch to turn on the branch between the target resonant module and the first switch, and then controls the first switch to turn on the branch between the target resonant module and the target inverter module, which can ensure the safety of the first switch and the second switch during operation.

[0126] In some possible embodiments, before step S9310, the method may further include step S9300.

[0127] Step S9300: when the target inverter module is in a working state, stop sending a driving pulse signal to the target inverter module.

[0128] In this embodiment, when the target inverter module is in working state, the control module will first stop sending the driving pulse signal to the target inverter module, and then close the second switch and the first switch, so as to avoid the situation where the current of the branch where the target resonant module is located is too large at the moment when the branch between the target resonant module and the target inverter module is turned on, thereby ensuring the safe use of the target resonant module.

[0129] As an implementation mode, the control module can determine whether the target inverter module is in a working state by judging the sending condition of the drive pulse signal. Specifically, when the control module sends a drive pulse signal to the target inverter module, it indicates that the target inverter module is in a working state, and then stops sending the drive pulse signal to the target inverter module.

[0130] In this embodiment, after step S9320, the method may further include step S9330.

[0131] Step S9330: Send a drive pulse signal to the target inverter module.

[0132] Step S940: determining whether the first switch corresponding to the target resonant module is in a normal working state based on the driving pulse signal input to the target inverter module and the detection signal output by the current detection module corresponding to the target resonant module.

[0133] This embodiment provides a control method for an electrical device, which describes in detail the process of determining a target resonance module. The control module can then determine whether the first switch corresponding to the target resonance module is in a normal working state based on the drive pulse signal and the detection signal. If the first switch is in an abnormal working state, the control module can stop controlling the target resonance module, which can avoid the situation where multiple resonance modules covered by the same pot are heated by multiple different inverter modules, thereby ensuring the service life of the electrical device.

[0134] See also Fig.10 , Fig.10A control device 1000 for an electrical device provided in an embodiment of the present application is schematically shown, and the device 1000 may include a first determination unit 1010, a second determination unit 1020, a conduction unit 1030 and a third determination unit 1040. Among them, the first determination unit 1010 is used to determine the target resonance module among N resonance modules, and the target resonance module refers to the resonance module covered by the cookware. The second determination unit 1020 is used to determine the target inverter module among M inverter modules. The conduction unit 1030 is used to conduct the branch between the target resonance module and the target inverter module. The third determination unit 1040 is used to determine whether the first switch corresponding to the target resonance module is in a normal working state based on the drive pulse signal input to the target inverter module and the detection signal output by the current detection module corresponding to the target resonance module; the detection signal is used to characterize the current change of the branch where the target resonance module is located.

[0135] In some possible embodiments, there are two driving pulse signals, and the two driving pulse signals include a complementary first pulse signal and a second pulse signal. When the amplitude of the first pulse signal is greater than 0, the amplitude of the detection signal is greater than 0; when the amplitude of the second pulse signal is greater than 0, the amplitude of the detection signal is equal to 0. The third determination unit 1040 is specifically used to determine whether the first switch corresponding to the target resonant module is in a normal working state based on the first pulse signal and the detection signal.

[0136] In some possible embodiments, the third determination unit 1040 is specifically used to obtain the first moment of the first pulse signal in the specified signal period, the first moment being the moment when the first pulse signal changes from a low level to a high level; obtain the detection signal at the second moment of the specified signal period, the second moment being the moment when the detection signal changes from a low level to a high level, and the second moment is later than the first moment; when the difference between the second moment and the first moment is less than or equal to a specified value, determine that the first switch corresponding to the target resonant module is in a normal working state.

[0137] In some possible embodiments, the device 1000 may further include a first stop unit (not shown in the figure) and a disconnection control unit (not shown in the figure). The first stop unit is used to stop sending a drive pulse signal to the target inverter module when the difference between the second moment and the first moment is greater than a specified value. The disconnection control unit is used to control the second switch corresponding to the target resonant module to disconnect the branch between the target resonant module and the target inverter module.

[0138] In some possible embodiments, the first determination unit 1010 is specifically used to receive N pot detection signals sent by N pot detection modules; determine the resonance module corresponding to the target pot detection signal in the N pot detection signals as the target resonance module; the target pot detection signal indicates that the resonance module corresponding to the pot detection module is covered by the pot.

[0139] In some possible embodiments, the conduction unit 1030 is specifically used to control the second switch corresponding to the target resonant module to conduct the branch between the target resonant module and the first switch; and control the first switch corresponding to the target resonant module to conduct the branch between the target resonant module and the target inverter module.

[0140] In some possible embodiments, the device 1000 may further include a second stop unit (not shown in the figure) and a sending unit (not shown in the figure). Before the conduction unit 1030 controls the second switch corresponding to the target resonant module to conduct the branch between the target resonant module and the first switch, the second stop unit is used to stop sending the drive pulse signal to the target inverter module when the target inverter module is in a working state. After the conduction unit 1030 controls the first switch corresponding to the target resonant module to conduct the branch between the target resonant module and the target inverter module, the sending unit is used to send the drive pulse signal to the target inverter module.

[0141] 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.

[0142] In several embodiments provided in the present application, the coupling between modules may be electrical, mechanical or other forms of coupling.

[0143] In addition, each functional module in each embodiment of the present application can be integrated into a control 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.

[0144] The present application provides a control device for an electrical device, and a control module can determine whether a first switch is in a normal working state based on the device. If the first switch is in an abnormal working state, the control module can stop controlling the target resonance module, which can avoid the situation where multiple resonance modules covered by the same pot are heated by multiple different inverter modules, thereby ensuring the service life of the electrical device.

[0145] See also Fig.11 , Fig.11 It is schematically shown that an embodiment of the present application further provides an electrical device 1100, which includes the above-mentioned electromagnetic heating circuit 1110. The specific implementation method of the electromagnetic heating circuit 1110 can refer to the relevant introduction in the above application environment embodiment, and will not be repeated here.

[0146] The control module in the electromagnetic heating circuit 1110 may include one or more processors 1111, a memory 1112, and one or more applications. The one or more applications are stored in the memory 1112 and configured to be executed by the one or more processors 1111, and the one or more applications are configured to execute the method described in the above embodiment.

[0147] The processor 1111 may include one or more processing cores. The processor 1111 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 1112, and calling data stored in the memory 1112. Optionally, the processor 1111 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 1111 can integrate one or more combinations of a central processing unit 1111 (CPU), a graphics processing unit 1111 (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 1111, and may be implemented separately through a communication chip.

[0148] The memory 1112 may include a random access memory 1112 (RAM) or a read-only memory 1112 (ROM). The memory 1112 may be used to store instructions, programs, codes, code sets or instruction sets. The memory 1112 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 (e.g., a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc. The data storage area may also store data created by the electronic device during use (e.g., a phone book, audio and video data, chat record data), etc.

[0149] See also Fig.12 , Fig.12It is schematically shown that an embodiment of the present application further provides a computer-readable storage medium 1200, in which computer program instructions 1201 are stored. The computer program instructions 1201 can be called by a processor to execute the method described in the above embodiment.

[0150] The computer-readable storage medium 1200 may be, for example, a flash memory, an electrically erasable programmable read-only memory (EEPROM), an electrically programmable read-only memory (EPROM), a hard disk, or a read-only memory (ROM). Optionally, the computer-readable storage medium includes a non-transitory computer-readable storage medium. The computer-readable storage medium 1200 has a storage space for computer program instructions 1201 for executing any method steps in the above method. These computer program instructions 1201 can be read from one or more computer program products or can be written into one or more computer program products.

[0151] The above are only preferred embodiments of the present application, and are not intended to limit the present application in any form. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments 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 embodiments 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: M inverter modules, each of which is provided with a signal terminal and an output terminal, and M is an integer greater than 1; N resonance modules, where N is an integer greater than 1; N first switches corresponding to the N resonance modules one by one, the first switches being provided with a first common terminal, a first active terminal and M first position terminals, the first active terminal being connected to the first common terminal, and the M first position terminals being connected to the output terminals of the M inverter modules one by one; N current detection modules corresponding one to one to the N resonance modules, the current detection modules being connected between the common end of the first switch and the resonance module; as well as A control module is respectively connected to the signal ends of the M inverter modules, the N first switches and the N current detection modules, and the control module is configured to: determine a target resonance module among the N resonance modules, wherein the target resonance module refers to a resonance module covered by the cookware; determine a target inverter module among the M inverter modules; turn on a branch between the target resonance module and the target inverter module; determine whether the first switch corresponding to the target resonance module is in a normal working state based on a drive pulse signal input to the target inverter module and a detection signal output by the current detection module corresponding to the target resonance module; the detection signal is used to characterize the current change of the branch where the target resonance module is located.

2. The electromagnetic heating circuit according to claim 1, characterized in that: The current detection module includes a current detection unit, a voltage conversion unit and a voltage comparison unit; The input end of the current detection unit is connected between the common end of the first switch and the resonance module, and is used to obtain the current signal of the branch where the resonance module is located; The voltage conversion unit is connected between the output terminal of the current detection unit and the non-phase input terminal of the voltage comparison unit, and is used to convert the current signal into a voltage signal; The inverting input terminal of the voltage comparison unit is connected to the first power supply terminal, and the output terminal of the voltage comparison unit is connected to the control module for outputting the detection signal to the control module.

3. The electromagnetic heating circuit according to claim 2, characterized in that: The output end of the current detection unit includes a first output end and a second output end, and the voltage conversion unit includes a first resistor and a second resistor; The first output terminal is connected to the first power supply terminal; The first resistor is connected between the first output terminal and the second output terminal; the second resistor is connected between the second output terminal and the non-inverting input terminal of the voltage comparison unit.

4. The electromagnetic heating circuit according to claim 3, characterized in that: The voltage conversion unit includes a third resistor; one end of the third resistor is connected to the non-inverting input end of the voltage comparison unit, and the other end of the third resistor is connected to the second power supply end, and the second power supply voltage output by the second power supply end is greater than the first power supply voltage output by the first power supply end.

5. The electromagnetic heating circuit according to claim 2, characterized in that: The current detection module includes a fourth resistor; one end of the fourth resistor is connected to the output end of the voltage comparison unit, and the other end of the fourth resistor is connected to the first power supply end.

6. The electromagnetic heating circuit according to claim 2, characterized in that: The current detection module further includes a capacitor connected between a non-inverting input terminal and an inverting input terminal of the voltage comparison unit.

7. The electromagnetic heating circuit according to any one of claims 1 to 6, characterized in that: The electromagnetic heating circuit further includes N second switches and N pot detection modules corresponding one-to-one to the N resonance modules, and the pot detection module is used to detect whether the resonance module is covered by the pot; The second switch is provided with a second common terminal, a second active terminal, a second position terminal and a third position terminal, the second active terminal is connected to the second common terminal, the second common terminal is connected to the current detection module; the second position terminal is connected to the signal output terminal of the pot detection module; the third position terminal is connected to the first common terminal of the first switch; The control module is also connected to N second switches respectively.

8. 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 7, and the method comprises: Determine a target resonance module among the N resonance modules, where the target resonance module refers to a resonance module covered by the cookware; Determine a target inverter module among the M inverter modules; Conducting a branch between the target resonant module and the target inverter module; Based on the drive pulse signal input to the target inverter module and the detection signal output by the current detection module corresponding to the target resonant module, it is determined whether the first switch corresponding to the target resonant module is in a normal working state; the detection signal is used to characterize the current change of the branch where the target resonant module is located.

9. The method according to claim 8, characterized in that There are two drive pulse signals, and the two drive pulse signals include a complementary first pulse signal and a second pulse signal. When the amplitude of the first pulse signal is greater than 0, the amplitude of the detection signal is greater than 0; When the amplitude of the second pulse signal is greater than 0, the amplitude of the detection signal is equal to 0; The determining whether the first switch corresponding to the target resonant module is in a normal working state based on the driving pulse signal input to the target inverter module and the detection signal output by the current detection module corresponding to the target resonant module includes: Based on the first pulse signal and the detection signal, it is determined whether the first switch corresponding to the target resonance module is in a normal working state.

10. The method according to claim 9, characterized in that The determining, based on the first pulse signal and the detection signal, whether the first switch corresponding to the target resonance module is in a normal working state includes: Acquire a first moment of the first pulse signal in a specified signal period, the first moment being a moment when the first pulse signal changes from a low level to a high level; Acquire the detection signal at a second moment of the specified signal period, the second moment being the moment when the detection signal changes from a low level to a high level, and the second moment is later than the first moment; When the difference between the second moment and the first moment is less than or equal to a specified value, it is determined that the first switch corresponding to the target resonance module is in a normal working state.

11. The method according to claim 10, characterized in that The method further comprises: When the difference between the second moment and the first moment is greater than a specified value, stop sending the drive pulse signal to the target inverter module; The second switch corresponding to the target resonant module is controlled to disconnect a branch between the target resonant module and the target inverter module.

12. The method according to any one of claims 8 to 11, characterized in that The determining of a target resonance module among the N resonance modules comprises: Receive N pot detection signals sent by N pot detection modules; The resonance module corresponding to the target pot detection signal among the N pot detection signals is determined as the target resonance module; the target pot detection signal indicates that the resonance module corresponding to the pot detection module is covered by the pot.

13. The method according to any one of claims 8 to 11, characterized in that The conducting the branch between the target resonant module and the target inverter module comprises: Controlling a second switch corresponding to the target resonance module to conduct a branch between the target resonance module and the first switch; The first switch corresponding to the target resonant module is controlled to turn on a branch between the target resonant module and the target inverter module.

14. The method according to claim 13, characterized in that Before controlling the second switch corresponding to the target resonance module to turn on the branch between the target resonance module and the first switch, the method further includes: When the target inverter module is in a working state, stopping sending a driving pulse signal to the target inverter module; After controlling the first switch corresponding to the target resonant module to turn on the branch between the target resonant module and the target inverter module, the method further includes: A drive pulse signal is sent to the target inverter module.

15. 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 7, and the device comprises: A first determining unit, configured to determine a target resonance module among the N resonance modules, wherein the target resonance module refers to a resonance module covered by the cookware; A second determining unit, used to determine a target inverter module among the M inverter modules; A conducting unit, used for conducting a branch between the target resonant module and the target inverter module; The third determination unit is used to determine whether the first switch corresponding to the target resonant module is in a normal working state based on the drive pulse signal input to the target inverter module and the detection signal output by the current detection module corresponding to the target resonant module; the detection signal is used to characterize the current change of the branch where the target resonant module is located.

16. An electrical device, characterized in that: The electrical device comprises the electromagnetic heating circuit according to any one of claims 1 to 7, and the control module in the electromagnetic heating circuit comprises: one or more processors; Memory; and 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 configured to execute the method according to any one of claims 8 to 14.

17. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, which can be called by a processor to execute the method according to any one of claims 8 to 14.

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