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

Abstract

The application discloses an electromagnetic heating circuit, a control method and device of an electric appliance and the electric appliance. The electromagnetic heating circuit comprises M inverter 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 and the first common end are connected, and the M first position ends are connected to the output ends of the M inverter modules in one-to-one correspondence. 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 inverter modules, the N first switches and the N current detection modules. The control module can detect the first switch in an abnormal working state, so as to avoid the situation that multiple resonance modules covered by the same pot are heated by multiple different inverter modules, and the service life of the electric appliance is ensured.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and more specifically, to an electromagnetic heating circuit, a control method for electrical equipment, a device, and electrical equipment. Background Technology

[0002] A multi-burner stove is an electromagnetic heating device with multiple coils built in. The multiple coils are evenly arranged inside the stove, enabling it to heat multiple pots and pans simultaneously.

[0003] To prevent interference when multiple cookwares are heating, multiple inverter modules are installed inside the multi-burner stove to provide alternating current to the coils. For example, when there are two cookwares, the coil covered by cookware one uses the same inverter module, while the coil covered by cookware two uses a different inverter module. Therefore, the controller can control the two inverter modules separately to adjust the heating parameters of the two cookwares independently.

[0004] Therefore, each coil is connected to multiple inverter modules via a switch. When a coil needs heating, the controller activates the switch to open the branch between the coil and one of the inverter modules. However, if the switch malfunctions, causing a coil to connect to the wrong inverter module, multiple coils covered by the same cookware will use multiple different inverter modules for heating. This results in inconsistent operating frequencies for the multiple coils, causing the entire multi-burner stove to malfunction. Summary of the Invention

[0005] This application provides an electromagnetic heating circuit, a control method, an apparatus, and an electrical device.

[0006] In a first aspect, some embodiments of this application provide an electromagnetic heating circuit, which includes M inverter modules, N resonant modules, N first switches corresponding to the N resonant modules, N current detection modules corresponding to the N resonant modules, and a control module, where M is an integer greater than 1 and N is an integer greater than 1. Each inverter module has a signal terminal and an output terminal. Each first switch has a first common terminal, a first active terminal, and M first position terminals. The first active terminal and the first common terminal are connected together, and the M first position terminals are connected one-to-one to the output terminals of the M inverter modules. The current detection modules are connected between the common terminal of the first switches and the resonant modules. The control module is connected to the signal terminals of M inverter modules, N first switches, and N current detection modules. The control module is configured to: determine the target resonant module among the N resonant modules (the target resonant module is the resonant module covered by the pot); determine the target inverter module among the M inverter modules; connect the branch between the target resonant module and the target inverter module; and determine whether the first switch corresponding to the target resonant module is in normal working condition 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 in the branch where the target resonant module is located.

[0007] Secondly, some embodiments of this application also provide a control method for an electrical device, the electrical device including the aforementioned electromagnetic heating circuit. The method includes: determining a target resonant module among N resonant modules, the target resonant module being a resonant module covered by a pot; determining a target inverter module among M inverter modules; connecting the branch between the target resonant module and the target inverter module; determining whether a first switch corresponding to the target resonant module is in normal working condition based on a drive pulse signal input to the target inverter module and a detection signal output by a current detection module corresponding to the target resonant module; the detection signal is used to characterize the current change in the branch where the target resonant module is located.

[0008] Thirdly, some embodiments of this application also provide a control device for an electrical appliance, which includes the aforementioned electromagnetic heating circuit. The device includes a first determining unit, a second determining unit, a conducting unit, and a third determining unit. The first determining unit is used to determine a target resonant module among N resonant modules, where the target resonant module refers to the resonant module covered by the cookware. The second determining unit is used to determine a target inverter module among M inverter modules. The conducting unit is used to conduct the branch between the target resonant module and the target inverter module. The third determining unit is used to determine whether the first switch corresponding to the target resonant module is in normal working condition 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 in the branch where the target resonant module is located.

[0009] Fourthly, embodiments of this application also provide an electrical device including the aforementioned electromagnetic heating circuit. 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 configured to be executed by the one or more processors, and are configured to perform the aforementioned method.

[0010] Fifthly, embodiments of this application also provide a computer-readable storage medium storing computer program instructions. These computer program instructions can be invoked by a processor to execute the methods described above.

[0011] Sixthly, embodiments of this application also provide a computer program product that, when executed, implements the above-described method.

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

[0013] On one hand, the control module can control the first switch to turn on 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 alternating current to the target resonant module. Furthermore, the control module can obtain the 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 conducting state based on the detection signal and the drive pulse signal.

[0014] Specifically, when the branch between the target resonant module and the target inverter module is conducting, the changing trends of the drive pulse signal and the detection signal are roughly synchronized. That is, the detection signal changes with the change of the drive pulse signal, indicating that the first switch is in normal working condition. Conversely, if the changing trends of the drive pulse signal and the detection signal are not synchronized, it indicates that the first switch is not conducting the branch between the target resonant module and the target inverter module, and the first switch is in abnormal working condition. In this case, the control module can stop controlling the target resonant module, thereby preventing multiple resonant modules covered by the same pot from using multiple different inverter modules for heating, and ensuring the service life of the electrical equipment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application.

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

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

[0019] Figure 4 yes Figure 2 The diagram shows the signal waveforms corresponding to the electromagnetic heating circuit.

[0020] Figure 5 yes Figure 2 A schematic diagram of the structure of the resonant module.

[0021] Figure 6 yes Figure 2 A schematic diagram of the medium current detection module.

[0022] Figure 7 This is a flowchart illustrating a control method for an electrical device provided in the first embodiment of this application.

[0023] Figure 8 This is a flowchart illustrating a control method for an electrical device provided in the second embodiment of this application.

[0024] Figure 9 This is a flowchart illustrating a control method for an electrical device provided in the third embodiment of this application.

[0025] Figure 10 This is a block diagram of a control device for an electrical appliance provided in an embodiment of this application.

[0026] Figure 11 This is a block diagram of the electrical equipment provided in the embodiments of this application.

[0027] Figure 12 This is a block diagram of a computer-readable storage medium provided in an embodiment of this application. Detailed Implementation

[0028] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0029] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

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

[0031] On one hand, the control module can control the first switch to turn on 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 alternating current to the target resonant module. Furthermore, the control module can obtain the 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 conducting state based on the detection signal and the drive pulse signal.

[0032] Specifically, when the branch between the target resonant module and the target inverter module is conducting, the changing trends of the drive pulse signal and the detection signal are roughly synchronized. That is, the detection signal changes with the change of the drive pulse signal, indicating that the first switch is in normal working condition. Conversely, if the changing trends of the drive pulse signal and the detection signal are not synchronized, it indicates that the first switch is not conducting the branch between the target resonant module and the target inverter module, and the first switch is in abnormal working condition. In this case, the control module can stop controlling the target resonant module, thereby preventing multiple resonant modules covered by the same pot from using multiple different inverter modules for heating, and ensuring the service life of the electrical equipment.

[0033] To facilitate a detailed explanation of the present application, the application environment of the embodiments of the present application will be described below with reference to the accompanying drawings. The embodiments of the present application provide an electromagnetic heating circuit 100 and an electrical device 200 configured with the electromagnetic heating circuit 100. The electrical device 200 is a device that heats a pot placed above it based on the phenomenon of electromagnetic induction. For example, the electrical device 200 can be a multi-burner stove, an induction cooker, etc.

[0034] Please see Figure 1 The electrical device 200 may include a housing 210, a function panel 230, and an electromagnetic heating circuit 100, which may include multiple coils 250. The function panel 230 is disposed on the outer surface of the housing 210 and is used to receive user control operations. The electromagnetic heating circuit 100 is disposed inside the housing 210 and is electrically connected to the function panel 230. The electromagnetic heating circuit 100 is used to operate according to the control operations received from the function panel 230 (e.g., controlling one or more coils 250 in the electromagnetic heating circuit 100 to heat). For example, the control operations may include an on / off operation, a timer operation, a heating mode selection operation, etc.

[0035] In some possible embodiments, the housing 210 may include a first housing portion (not shown) and a second housing portion (not shown), which overlap each other to form a storage space for housing the electromagnetic heating circuit 100. That is, the housing 210 can protect and store the electromagnetic heating circuit 100. The first housing portion may have a fixing structure for securing a portion of the electromagnetic heating circuit 100. Specifically, the fixing structure includes, but is not limited to, fixing grooves, clamping members (e.g., elastic clips), etc. The outer surface of the second housing portion has a mounting groove for mounting the functional panel 230.

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

[0037] The coil 250 is used to generate an alternating magnetic field with a constantly changing direction under the excitation of an alternating current, so that eddy currents are generated in the metal conductor (e.g., a pot placed on the electrical appliance 200) within the alternating magnetic field, and the metal conductor is heated under the action of the eddy currents to cook the food placed inside.

[0038] In this embodiment, there can be multiple coils 250, arranged in a specific pattern inside the housing 210. This ensures that when the cookware is placed on the electrical appliance 200, a portion of the coils 250 are heated. Therefore, the placement of the cookware on the electrical appliance 200 is more flexible. Specifically, the number of coils 250 can be greater than or equal to 30; for example, 40, 60, 80, etc. Figure 1 In the embodiment shown, there are 50 coils 250 arranged in 10 columns, and the 10 columns of coils 250 are arranged sequentially at intervals along the length of the electrical device 200. Figure 1 The dotted coil 270 represents one possible placement position of the cookware. When the cookware is placed in this position, coils 1, 2, 6, 7, 8, 12, and 13 heat it.

[0039] The electromagnetic heating circuit 100 is used to control the operation of the coil 250. Specifically, there can be multiple electromagnetic heating circuits 100, each used to control a portion of the multiple coils 250. Figure 1 In the illustrated embodiment, there are two electromagnetic heating circuits 100, each controlling 25 coils. Specifically, one electromagnetic heating circuit 100 controls coils 1 through 25, and the other electromagnetic heating circuit 100 controls coils 26 through 50.

[0040] Please see 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. Each inverter module 10 may have a signal terminal 120 and an output terminal 140. Each first switch 40 may have a first common terminal 410, a first active terminal 430, and M first position terminals 450. The first active terminal 430 and the first common terminal 410 are connected together, and the M first position terminals 450 are connected one-to-one to the output terminals 140 of the M inverter modules 10. The current detection modules 50 are connected between the common terminal 410 of the first switches 40 and the resonant modules 30. The control module 60 is connected to the signal terminals 120 of the M inverter modules 10, the N first switches 40, and the N current detection modules 50.

[0041] On 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 alternating current to the target resonant module. Furthermore, 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 determine whether the first switch 40 is in a normal conducting state based on the detection signal and the drive pulse signal.

[0042] Specifically, when the branch between the target resonant module and the target inverter module is conducting, the changing trends of the drive pulse signal and the detection signal are roughly synchronized. That is, the detection signal changes with the change of the drive pulse signal, indicating that the first switch 40 is in normal working condition. Conversely, if the changing trends of the drive pulse signal and the detection signal are not synchronized, it indicates that the first switch 40 is not conducting the branch between the target resonant module and the target inverter module, and the first switch 40 is in abnormal working condition. In this case, the control module 60 can stop controlling the target resonant module, thereby preventing multiple resonant modules covered by the same pot from using multiple different inverter modules for heating, ensuring that the electrical equipment 200 is in normal working condition.

[0043] The specific implementation methods of each module in the electromagnetic heating circuit 100 are described below.

[0044] In this embodiment, the inverter module 10 outputs alternating current to the resonant module 30, thereby causing the coil in the resonant module 30 to generate an alternating magnetic field, which in turn heats the cookware placed within 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 equals the number of cookware that can be simultaneously heated on the electromagnetic heating circuit 100. Figure 1 In the illustrated embodiment, two cookwares can be placed simultaneously on the 25 coils 250 corresponding to the electromagnetic heating circuit 100, thus requiring two inverter modules 10. Therefore, when two cookwares need to be heated simultaneously, different inverter modules 10 can independently control the multiple coils covered by different cookwares, while the multiple coils covered by the same cookware are controlled by the same inverter module 10, thereby enabling the two cookwares to be heated independently.

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

[0046] In some possible embodiments, inverter module 10 may be an inverter circuit (e.g., a single-phase half-bridge inverter circuit, a single-phase full-bridge inverter circuit, etc.). Please refer to [link to relevant documentation]. Figure 3 The inverter module 10 has two signal terminals 120, including 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 high, the second pulse signal PWM_L is low, and when the first pulse signal PWM_H is low, the second pulse signal PWM_L is high. (See also...) Figure 4 , Figure 4 Part (a) in the figure shows the waveform curve of the first pulse signal PWM_H. Figure 4 Part (b) in the figure shows the waveform curve of the second pulse signal PWM_L.

[0047] Please refer to it again. Figure 3 The inverter module 10 may include a first switch Q1, a second switch Q2, a first resonant absorption capacitor CM1, and a second resonant absorption capacitor CM2. The first terminal 11 of the first switch Q1 is connected to the third power supply terminal 21, the control terminal 12 of the first switch Q1 is connected to the first signal terminal 1210, and the second terminal 13 of the first switch Q1 is connected to the first terminal 15 of the second switch Q2. The control terminal 16 of the second switch Q2 is connected to the second signal terminal 1230, and the second terminal 17 of the second switch Q2 is grounded. Specifically, the first switch Q1 and the second switch Q2 may be insulated-gate bipolar transistors (IGBTs), where the first terminal 11 of the first switch Q1 and the first terminal 15 of the second switch Q2 are the collectors of the IGBTs, the control terminals 12 of the first switch Q1 and 16 of the second switch Q2 are the gates of the IGBTs, and the second terminals 13 of the first switch Q1 and 17 of the second switch Q2 are the emitters of the IGBTs. Therefore, the inverter module 10 in this embodiment adopts a single-phase half-bridge inverter circuit structure. The first switch Q1 and the second switch 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. The DC voltage VBUS can be the voltage after the mains voltage is rectified by the 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 terminal 11 and the second terminal 13 of the first switching transistor Q1. The second resonant absorption capacitor CM2 is connected between the first terminal 15 and the second terminal 17 of the second switching transistor Q2. The first resonant absorption capacitor CM1 is used to absorb voltage spikes at the first switching transistor Q1, preventing damage to Q1. The second resonant absorption capacitor CM2 is used to absorb voltage spikes at the second switching transistor Q2, preventing damage to Q2.

[0049] In this embodiment, the resonant module 30 is used to generate an alternating magnetic field under the excitation of an alternating current. Please refer to [link / reference]. Figure 5 The resonant module 30 may include a coil LX, a first resonant capacitor CX1, and a second resonant capacitor CX2. One end of the series connection between the first resonant capacitor CX1 and the second resonant capacitor CX2 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 terminal of the first resonant capacitor CX1 and the second resonant capacitor CX2. Specifically, when the branch between the resonant module 30 and one of the inverter modules 10 is conducting, the coil LX and the second resonant capacitor CX2 resonate when the first switch Q1 in the inverter module 10 is turned on; and the coil LX and the first resonant capacitor CX1 resonate when the second switch Q2 in the inverter module 10 is turned on.

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

[0051] In this embodiment, a first switch 40 is connected between M inverter modules 10 and a resonant module 30, and is used to conduct the branch between one of the inverter modules 10 and the resonant module 30. The first switch 40 may have 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 one-to-one to the output terminals 140 of the M inverter modules 10. The first common terminal 410 is connected to the resonant 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 resonant 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 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 terminal of the first switch 40 and the resonant module 30. It is used to acquire a detection signal, which characterizes the current change in the branch where the resonant module 30 is located. Please refer to [link to relevant documentation]. 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 resonant module 30, and is used to acquire the current signal of the branch where the resonant module 30 is located.

[0053] The input terminal 5200 of the current detection unit 520 may include a first input terminal 5201 and a second input terminal 5203. The first input terminal 5201 is connected to the common terminal 410 of the first switch 40, and the second input terminal 5203 is connected to the first terminal 31 of the coil LX in the resonant module 30. Therefore, the current detection unit 520 is connected in series in the branch where the resonant module 30 is located through the first input terminal 5201 and the second input terminal 5203, and it can acquire the current signal of the branch where the resonant module 30 is located. Please refer again. Figure 4 , Figure 4 Part (c) shows the waveform of the current signal. It is easy to see from this waveform that the current in the branch where the resonant module 30 is located is an alternating current; that is, the current direction changes continuously under the control of the first pulse signal PWM_H and the second pulse signal PWM_L. Specifically, under the control of the first pulse signal PWM_H, the current direction is positive and the current amplitude is greater than 0; under the control of the second pulse signal PWM_L, the current direction is negative 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 that since the inverter module 10 and the resonant module 30 are respectively connected to the mains power, the current value of the branch where the resonant module 30 is located is relatively large. Therefore, a current transformer is needed to reduce the current value to match the subsequent circuitry. The output terminal 5220 of the current detection unit 520 can include a first output terminal 5221 and a second output terminal 5223. 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, which is a DC voltage. For example, the amplitude of the first power supply voltage VDD1 can be 2.5V, 3V, etc.

[0055] A voltage conversion unit 540 is connected between the output terminal 5220 of the current detection unit 520 and the non-inverting input terminal 5600 of the voltage comparison unit 560. It converts 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 converts the current signal output by the current detection unit 520 into a voltage signal across its terminals. Consequently, under the influence of the first supply voltage VDD1 input to the first output terminal 5221, the input voltage at the non-inverting input terminal 5600 of the voltage comparison unit 560 becomes the sum of the first 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 non-inverting input terminal 5600 of the voltage comparison unit 560. The second resistor R2 limits the current to prevent excessive current at the non-inverting input terminal of the voltage comparison unit 560.

[0056] Please refer to it again. Figure 4 , Figure 4 Part (d) shows the waveform of the input voltage at the non-inverting input terminal 5600 of the voltage comparator unit 560. Since the first resistor R1 is a purely resistive load, the voltage change trend across the first resistor R1 is consistent with the current change trend in the branch where the resonant module 30 is located. Furthermore, under the action of the first supply voltage VDD1, the voltage across the first resistor R1 is pulled up by the voltage value corresponding to the first supply voltage VDD1 before being input to the non-inverting input terminal 5600. Specifically, when the current amplitude in the branch where the resonant module 30 is located is greater than 0, the amplitude of the input voltage at the non-inverting input terminal 5600 is greater than VDD1; when the current amplitude in the branch where the resonant module 30 is located is less than 0, the amplitude of the input voltage at the non-inverting 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 comparator unit 560, and the other end of the third resistor R3 is connected to the second power supply terminal 25. 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. By setting the third resistor R3 at the non-inverting input terminal 5600, and ensuring that the second power supply voltage VDD2 input to the third resistor R3 is greater than the power supply voltage VDD1, this embodiment can guarantee that the input voltage at the non-inverting input terminal 5600 is always greater than 0, thus ensuring the operational stability of the voltage comparator unit 560.

[0058] The inverting input terminal 5620 of the voltage comparator unit 560 is connected to the first power supply terminal 23. Therefore, the input voltage of the inverting input terminal 5620 is the first power supply voltage VDD1. The output terminal 5640 of the voltage comparator unit 560 is connected to the control module 60 and is used to output a detection signal to the control module 60. Specifically, the voltage comparator unit 560 can be a voltage comparator, which is used to compare the voltage between the non-inverting input terminal 5600 and the inverting input terminal 5620. When the input voltage of the non-inverting 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 non-inverting 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) in the figure is a waveform diagram of the output signal (i.e., the detection signal) of the output terminal 5640. The waveform of the output signal is a square wave.

[0059] Therefore, in this embodiment, the current detection module 50 can convert the current signal of the branch where the resonant module 30 is located into a square wave signal (i.e., a detection signal). When the amplitude of the current signal is greater than 0, the square wave signal is at a high level; 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 here that, because the coil LX in the resonant module 30 is an inductive load, the current signal in the branch where the resonant module 30 is located will lag behind the drive pulse signal. Specifically, from Figure 4It is not difficult to see that when the first pulse signal PWM_H changes from low level to high level, the current signal of the branch where the resonant module 30 is located does not change from negative value to positive value synchronously, but changes to positive value after a period of time t1. This causes the output signal of the voltage comparison unit 5640 to also change from low level to high level after 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 which is connected to the output terminal 5640 of the voltage comparison unit 560, and the other end of which is connected to the first power supply terminal 2600. In this embodiment, the fourth resistor R4 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 connected between the non-inverting input terminal 5600 and the inverting input terminal 5620 of the voltage comparison unit 560. The capacitor C can filter the instantaneously changing voltage to avoid the voltage comparison unit 560 from making a misjudgment when the input voltage at the non-inverting input terminal 5600 or the input voltage at the inverting input terminal 5620 changes abruptly, thereby ensuring the normal output of the detection signal.

[0063] In this embodiment, the electromagnetic heating circuit 100 may further include N second switches 70 and N pot detection modules 80, each corresponding to one of the N resonant modules 30. The control module 60 is also connected to the N second switches 70 and the N pot detection modules 80. The pot detection module 80 is used to detect whether the resonant module 30 is covered by a pot. Specifically, when the resonant module 30 corresponding to the pot detection module 80 is covered by a pot, the inductance value of the coil LX in the resonant module 30 changes. The pot detection module 80 can output pot detection signals of different frequencies to the control module 60 based on the change in the coil inductance value. The control module 60 then determines whether the resonant module 30 is covered by a pot based on the aforementioned pot detection signals. This embodiment does not limit the specific implementation of the pot detection module 80.

[0064] The second switch 70 may have a second common terminal 720, a second movable terminal 740, a second position terminal 760, and a third position terminal 780. The second movable 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 resonant module 30 are connected in series in a one-to-one correspondence.

[0065] When the second active terminal 740 and the second position terminal 760 are connected, the branch between the pot detection module 80 and the resonant module 30 is connected, and the resonant module 30 is in the pot detection state. When the control module 60 determines that the resonant module 30 is covered by a pot, it can control the second active terminal 740 and the third position terminal 780 to connect, so that one of the inverter modules 10 can provide alternating current to the resonant module 30, and the resonant 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 connected to the signal terminals of M inverter modules 10, N first switches 40, and N current detection modules 50. On one hand, the control module 60 can control the first switches 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 alternating current to the target resonant module. Furthermore, 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 determine whether the first switch 40 is in a normal conducting state based on the detection signal and the drive pulse signal. Specifically, the control module 60 can be a control chip, integrated circuit board, or other structure. The specific control process of the control module 60 is described in detail in the following method embodiment.

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

[0068] Please see Figure 7 , Figure 7 The illustration schematically depicts a control method for an electrical device according to a first embodiment of this application. Specifically, the method includes the following steps.

[0069] Step S710: Determine the target resonant module among the N resonant modules.

[0070] In this embodiment, the target resonant module refers to the resonant module covered by the pot. Here, "resonant module covered by the pot" means that at least a portion of the coil structure in the resonant module is covered by the pot. In this case, the resonant module needs to heat the pot. Specifically, the implementation method of the control module determining the target resonant module among N resonant modules is described in the following embodiments.

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

[0072] In this embodiment, the target inverter module refers to the inverter module that provides alternating current to the target resonant module. The control module can determine the target inverter module among the M inverter modules based on the pot's state. The pot's state can include an unheated state and a heated state. As one implementation, a temperature sensing device can be installed on the electrical equipment. The control module can obtain the bottom temperature of the pot based on the temperature sensing device and determine the pot's state based on the bottom temperature. For example, if the bottom temperature is lower than a specified temperature (e.g., 30 degrees Celsius), the pot is in an unheated state; if the bottom temperature is higher than the specified temperature, the pot is in a heated state. Specifically, the temperature sensing device can be a temperature sensor.

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

[0074] In another implementation, if the cookware is in a heated state, it indicates that the cookware has been heated for a period of time on the electrical appliance. When the user moves the cookware, some resonant modules that are not currently heated may be covered by the cookware and become target resonant modules. In this case, the control module can determine whether the resonant modules adjacent to the target resonant module are in a heated state. If the adjacent resonant modules are heated, the inverter module corresponding to that resonant module is identified as the target inverter module, ensuring that multiple resonant modules covered by the same cookware use the same inverter module for heating.

[0075] In some other possible embodiments, the control module can directly determine whether the resonant module at the adjacent position of the target inverter module is in a heating state. If the resonant module at the adjacent position is in a heating state, the inverter module corresponding to that resonant module is determined as the target inverter module. If 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: Connect the branch between the target resonant module and the target inverter module.

[0077] In this embodiment, the control module can 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: Based on the drive pulse signal of the input target inverter module and the detection signal output by the current detection module corresponding to the target resonant module, determine whether the first switch corresponding to the target resonant module is in normal working condition.

[0079] Here, we first explain the "operating state of the first switch." If the electromagnetic heating circuit containing the first switch experiences overheating, or if the branch between the first switch and the control module becomes open, preventing the control module from controlling the first switch to connect the branch between the target resonant module and the target inverter module, then the first switch is in an abnormal operating state. Conversely, if the control module can successfully control the first switch, connecting the branch between the target resonant module and the target inverter module, then the first switch is in a normal operating state.

[0080] In this embodiment, the detection signal is used to characterize the current change in 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 conducting state, the changing trend of the drive pulse signal and the changing trend of the detection signal are roughly synchronized. That is, the detection signal changes with the change of the drive pulse signal, indicating that the first switch is in a normal working state. Conversely, if the changing trend of the drive pulse signal and the changing trend of the detection signal are not synchronized, it indicates that the first switch is not conducting 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 normal working condition based on the drive pulse signal of the input 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 in determining whether the first switch is in normal working condition is described in the following embodiments.

[0082] This embodiment provides a control method for electrical equipment. The control module can determine whether a first switch is in a normal operating state based on this method. If the first switch is in an abnormal operating state, the control module can stop controlling the target resonant module, thus avoiding the situation where multiple resonant modules covered by the same cookware use multiple different inverter modules for heating, and ensuring the service life of the electrical equipment.

[0083] Please see Figure 8 , Figure 8The illustration schematically depicts a control method for an electrical device according to a second embodiment of this application. In this method, the driving pulse signal is two-way, comprising 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 steps.

[0084] Step S810: Determine the target resonant module among the N resonant modules.

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

[0086] Step S830: Connect the branch between the target resonant module and the target inverter module.

[0087] Step S840: Based on the drive pulse signal of the input target inverter module and the detection signal output by the current detection module corresponding to the target resonant module, determine whether the first switch corresponding to the target resonant module is in normal working condition.

[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 normal working condition.

[0090] Please refer to it 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 branch between the target resonant module and the target inverter module is turned on by the first switch, the changing trends of the first pulse signal and 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 simultaneously. Furthermore, due to the hysteresis effect of the coil in the target resonant module, within the same period, 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 duration. Figure 4 The duration t1 is given. Therefore, the control module can determine whether the first switch corresponding to the target resonant module is in normal working condition based on the above characteristics, the first pulse signal, and the detection signal. Specifically, step S8400 may include steps S8410 to S8430.

[0091] Step S8410: Obtain the first pulse signal at the first moment of the specified signal period.

[0092] In this embodiment, the first moment is the moment when the first pulse signal transitions from a low level to a high level. The specified signal period can be the time interval between two adjacent square wave pulses in the first pulse signal transitioning 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 internally by the control module, the control module can determine the first moment of the specified signal period by obtaining the signal parameters of the first pulse signal (e.g., the start time of transmission, the signal period, etc.).

[0094] Step S8420: Obtain 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 low level to high level. The second moment is later than the first moment, and the second moment and the first moment correspond to the same specified signal period.

[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 times are different, and the detection signal value corresponding to the later sampling time is greater than the detection signal value corresponding to the earlier sampling time, then either sampling time can be determined as the second time, or the average value of the two adjacent sampling times can be determined as the second time.

[0097] Step S8430: If the difference between the second time point and the first time point is less than or equal to a specified value, determine that the first switch corresponding to the target resonant module is in normal working condition.

[0098] In this embodiment, the specified value can be a default value in the control module, or it can be adjusted by the R&D personnel based on the actual working conditions of the electrical equipment. For example, the specified value can be 0.1ms, 0.05ms, etc. If the difference between the second moment and the first moment in the control module is less than or equal to the specified value, it indicates that the first pulse signal and the detection signal change from low level to high level almost simultaneously. This indicates 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, steps S8440 and S8450 are further included after step S8420.

[0100] In step S8440, if the difference between the second time point and the first time point is greater than a specified value, stop sending drive pulse signals to the target inverter module.

[0101] In this embodiment, if the difference between the second time point and the first time point is greater than a specified value, it indicates that the changing trend of the detection signal and the changing trend of the first pulse signal are not synchronized. This means that the first switch has not connected the branch between the target resonant module and the target inverter module, but has instead connected the branch between the target resonant module and other inverter modules. In this case, the first switch is in an abnormal operating state. Under these circumstances, the control module stops sending drive pulse signals 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, thereby stopping the target resonant module from heating. This avoids the situation where multiple resonant modules covered by the same pot are heated by multiple different inverter modules, thus ensuring the service life of the electrical equipment.

[0104] As one possible implementation, after executing step S8450, the control module can also generate an alarm message and send it to the function panel for display, or send the alarm message to a mobile terminal (e.g., a smartphone) connected to the electrical equipment to remind the user to repair the electrical equipment. For example, the alarm message could read, "Circuit malfunction, please check."

[0105] As another possible implementation, after executing step S8450, the control module can also generate a fault record. This fault record can be stored within the control module and can help maintenance personnel quickly locate the faulty hardware during maintenance. For example, the content of the fault record could be "At XX time, the first switch corresponding to coil X failed".

[0106] As another possible implementation, the failure of the first switch may be caused by excessively high temperature in the electromagnetic heating circuit where the first switch is located. After executing step S8450, the control module can reconnect the branch between the target resonant module and the target inverter module at specified intervals and re-determine whether the first switch corresponding to the target resonant module is in normal working condition. That is, the control module re-executes steps S830 and S840. The specified interval can be a default value in the control module or can be adjusted by the developers based on the cooling time required by the electromagnetic heating circuit. For example, the specified interval can be 30s, 60s, etc.

[0107] This embodiment provides a control method for electrical equipment. The method details how a control module determines whether a first switch is in a normal operating state based on a drive pulse signal and a detection signal. If the first switch is in an abnormal operating state, the control module can stop controlling the target resonant module. This avoids the situation where multiple resonant modules covered by the same cookware use multiple different inverter modules for heating, thus ensuring the service life of the electrical equipment.

[0108] Please see Figure 9 , Figure 9 The diagram illustrates a method for controlling an electrical device according to a third embodiment of this application. Specifically, the method includes the following steps.

[0109] Step S910: Determine the target resonant module among the N resonant modules.

[0110] In some possible embodiments, N resonant modules are connected one-to-one with N pot detection modules. The control module can determine the target resonant module among the N resonant modules by using the pot detection signals sent by the N pot detection modules. Specifically, step S910 may include steps S9100 and S9120.

[0111] Step S9100: Receive N boiler detection signals sent by N boiler 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 resonant module connected to the pot detection module. When the resonant module covers the pot, the equivalent inductance value of the coil in the resonant 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 gradually increases; as the distance between the pot and the coil decreases, the equivalent inductance value of the coil decreases. Specifically, the signal frequency of the pot detection signal can be determined according to the following frequency calculation formula.

[0113]

[0114] Where f is the signal frequency of the pot detection signal, L is the equivalent inductance of the pot detection module, and C is the equivalent capacitance of the pot detection module. When the equivalent inductance of the coil decreases, the equivalent inductance of the pot detection module also decreases, resulting in an increase in the signal frequency of the pot detection signal.

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

[0116] In one implementation, the control module can receive N boiler detection signals from N boiler detection modules at preset intervals. The preset interval can be a default value in the control module or can be adjusted by the developers based on the actual operating conditions of the electrical equipment. For example, the preset interval could be 1 second, 10 seconds, etc.

[0117] As another implementation, when the electrical appliance is in operation, the control module can receive N pot detection signals from N pot detection modules upon receiving a control signal from the function panel. For example, the control signal could be a heating mode selection signal. Upon receiving this control signal, the control module likely indicates that a pot to be heated is placed on the electrical appliance, and thus receives N pot detection signals from the N pot detection modules.

[0118] Step S9120: Determine the resonant module corresponding to the target boiler detection signal among the N boiler detection signals as the target resonant module.

[0119] In this embodiment, the target pot detection signal indicates that the resonant module corresponding to the pot detection module is covered by the pot. As one implementation, if the signal frequency of the pot detection signal is greater than a specified frequency, the control module determines that the pot detection signal is the target pot detection signal, and then determines the resonant module corresponding to the target pot detection signal as the target resonant module. Specifically, the specified frequency can be a default value in the control module, or it can be adjusted by the developers based on the actual working conditions of the electromagnetic heating circuit; this embodiment does not impose specific limitations.

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

[0121] Step S930: Connect the branch between the target resonant module and the target inverter module.

[0122] In this embodiment, a first switch and a second switch are provided in the branch between the target resonant module and the target inverter module. Specifically, step S930 may include steps S9310 and 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 conduct the branch between the target resonant module and the first switch, and then controls the first switch to conduct 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, the method may further include step S9300 before step S9310.

[0127] Step S9300: When the target inverter module is in working state, stop sending drive pulse signals to the target inverter module.

[0128] In this embodiment, when the target inverter module is in operation, the control module will first stop sending drive pulse signals to the target inverter module, and then close the second switch and the first switch. This can prevent the current in the branch where the target resonant module is located from being too large at the moment 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] In one implementation, the control module can determine whether the target inverter module is in operation by judging the transmission status of the drive pulse signal. Specifically, if the control module sends a drive pulse signal to the target inverter module, it indicates that the target inverter module is in operation, and the control module then stops sending drive pulse signals 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: Based on the drive pulse signal of the input target inverter module and the detection signal output by the current detection module corresponding to the target resonant module, determine whether the first switch corresponding to the target resonant module is in normal working condition.

[0133] This embodiment provides a control method for an electrical appliance. The method details the process of determining the target resonant module. The control module can then determine whether the first switch corresponding to the target resonant 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 resonant module. This avoids the situation where multiple resonant modules covered by the same cookware use multiple different inverter modules for heating, thus ensuring the service life of the electrical appliance.

[0134] Please see Figure 10 , Figure 10The illustration schematically depicts a control device 1000 for an electrical appliance according to an embodiment of this application. The device 1000 may include a first determining unit 1010, a second determining unit 1020, a conducting unit 1030, and a third determining unit 1040. The first determining unit 1010 determines a target resonant module among N resonant modules, where the target resonant module refers to the resonant module covered by the cookware. The second determining unit 1020 determines a target inverter module among M inverter modules. The conducting unit 1030 conducts the circuit between the target resonant module and the target inverter module. The third determining unit 1040 determines whether the first switch corresponding to the target resonant module is in normal working condition 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 characterizes the current change in the circuit where the target resonant module is located.

[0135] In some possible embodiments, the driving pulse signal is two-way, including 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 determining 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 determining unit 1040 is specifically used to acquire the first pulse signal at a first moment in a specified signal period, the first moment being the moment when the first pulse signal changes from a low level to a high level; acquire the detection signal at a second moment in the specified signal period, the second moment being the moment when the detection signal changes from a low level to a high level, the second moment being later than the first moment; and determine that the first switch corresponding to the target resonant module is in normal working condition if the difference between the second moment and the first moment is less than or equal to a specified value.

[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 drive pulse signals to the target inverter module when the difference between the second time point and the first time point 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 determining unit 1010 is specifically used to receive N pot detection signals sent by N pot detection modules; determine the resonant module corresponding to the target pot detection signal among the N pot detection signals as the target resonant module; the target pot detection signal indicates that the resonant module corresponding to the pot detection module is covered by the pot.

[0139] In some possible embodiments, the conducting 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 to 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) and a sending unit (not shown). Specifically, before the turn-on unit 1030 controls the second switch corresponding to the target resonant module to turn on the branch between the target resonant module and the first switch, the second stop unit is used to stop sending drive pulse signals to the target inverter module when the target inverter module is in an operating state. After the turn-on unit 1030 controls 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 sending unit is used to send drive pulse signals to the target inverter module.

[0141] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described device and module can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

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

[0143] Furthermore, the functional modules in the various embodiments of this application can be integrated into a single control module, or each module can exist physically separately, or two or more modules can be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0144] This application provides a control device for an electrical appliance. The control module can determine whether a first switch is in a normal operating state based on this device. If the first switch is in an abnormal operating state, the control module can stop controlling the target resonant module, thus preventing multiple resonant modules covered by the same cookware from using multiple different inverter modules for heating, and ensuring the service life of the electrical appliance.

[0145] Please see Figure 11 , Figure 11 The illustration shows that an electrical device 1100 is also provided in this application embodiment. The electrical device 1100 includes the electromagnetic heating circuit 1110 described above. The specific implementation of the electromagnetic heating circuit 1110 can be referred to the relevant description in the application environment embodiment above, 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 application programs. The one or more application programs are stored in the memory 1112 and configured to be executed by the one or more processors 1111, and are configured to perform the methods described in the above embodiments.

[0147] The processor 1111 may include one or more processing cores. The processor 1111 connects to various parts of the entire battery management system using various interfaces and lines, and performs various functions and processes data of the battery management system by running or executing instructions, programs, code sets, or instruction sets stored in memory 1112, and by calling data stored in memory 1112. Optionally, the processor 1111 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 1111 may integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the displayed content; and the modem handles wireless communication. It is understood that the modem may also not be integrated into the processor 1111 and may be implemented separately using a communication chip.

[0148] The memory 1112 may include random access memory (RAM) or read-only memory (ROM). The memory 1112 can be used to store instructions, programs, code, code sets, or instruction sets. The memory 1112 may include a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (e.g., touch functionality, sound playback functionality, image playback functionality, etc.), and instructions for implementing the various method embodiments described above. The data storage area may also store data created during the use of the electronic device (e.g., phonebook, audio / video data, chat log data, etc.).

[0149] Please see Figure 12 , Figure 12The present application also schematically illustrates a computer-readable storage medium 1200, which stores computer program instructions 1201 that can be invoked by a processor to execute the methods described in the above embodiments.

[0150] The computer-readable storage medium 1200 may be, for example, flash memory, electrically erasable programmable read-only memory (EEPROM), electrically programmable read-only memory (EPROM), hard disk, or 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 storage space for computer program instructions 1201 that perform any of the method steps described above. These computer program instructions 1201 may be read from or written to one or more computer program products.

[0151] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An electromagnetic heating circuit, characterized in that, include: M inverter modules, each inverter module having a signal terminal and an output terminal, wherein M is an integer greater than 1; There are N resonant modules, where N is an integer greater than 1; N first switches, each corresponding to one of the N resonant modules, each first switch having 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 one-to-one to the output terminals of the M inverter modules; N current detection modules, each corresponding to one of the N resonant modules, are connected between the common terminal of the first switch and the resonant modules. as well as A control module is connected to the signal terminals of the M inverter modules, the N first switches, and the N current detection modules. The control module is configured to: determine a target resonant module among the N resonant modules, wherein the target resonant module refers to the resonant module covered by the cookware; determine a target inverter module among the M inverter modules; connect the branch between the target resonant module and the target inverter module; and determine whether the first switch corresponding to the target resonant module is in normal working condition 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 in the branch where the target resonant 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 terminal of the current detection unit is connected between the common terminal of the first switch and the resonant module, and is used to obtain the current signal of the branch where the resonant module is located. The voltage conversion unit is connected between the output terminal of the current detection unit and the non-inverting 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 terminal of the current detection unit includes a first output terminal and a second output terminal, 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 terminal of the voltage comparison unit, and the other end of the third resistor is connected to a second power supply terminal, wherein the second power supply voltage output by the second power supply terminal is greater than the first power supply voltage output by the first power supply terminal.

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 terminal of the voltage comparison unit, and the other end of the fourth resistor is connected to the first power supply terminal.

6. The electromagnetic heating circuit according to claim 2, characterized in that, The current detection module also includes a capacitor connected between the non-inverting input terminal and the 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 also includes N second switches corresponding one-to-one with the N resonant modules and N pot detection modules, wherein the pot detection modules are used to detect whether the resonant modules are covered by the pot; The second switch has a second common terminal, a second movable terminal, a second position terminal, and a third position terminal. The second movable terminal and the second common terminal are connected, and 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 of the second switches.

8. A method for controlling an electrical device, characterized in that, The electrical device includes the electromagnetic heating circuit as described in any one of claims 1 to 7, and the method includes: Identify the target resonant module among N resonant modules, where the target resonant module refers to the resonant module covered by the pot. Determine the target inverter module among the M inverter modules; Connect the branch between the target resonant module and the target inverter module; Based on the drive pulse signal of 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 normal working condition; the detection signal is used to characterize the current change in the branch where the target resonant module is located.

9. The method according to claim 8, characterized in that, The driving pulse signal is two-way, 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 step of determining whether the first switch corresponding to the target resonant module is in normal working condition based on the input drive pulse signal of 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 resonant module is in normal working condition.

10. The method according to claim 9, characterized in that, The step of determining whether the first switch corresponding to the target resonant module is in normal working condition based on the first pulse signal and the detection signal includes: The first pulse signal is acquired at the first moment of a specified signal period, where the first moment is the moment when the first pulse signal changes from a low level to a high level. The detection signal is acquired at a second moment within the specified signal period, where the detection signal transitions from a low level to a high level, and the second moment is later than the first moment. If the difference between the second time point and the first time point is less than or equal to a specified value, it is determined that the first switch corresponding to the target resonant module is in normal working condition.

11. The method according to claim 10, characterized in that, The method further includes: If the difference between the second time point and the first time point is greater than a specified value, stop sending drive pulse signals to the target inverter module; The second switch corresponding to the target resonant module is controlled to disconnect the 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 determination of the target resonant module among the N resonant modules includes: Receive N boiler detection signals sent by N boiler detection modules; The resonant module corresponding to the target pot detection signal in the N pot detection signals is determined as the target resonant module; the target pot detection signal indicates that the resonant 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 branch connecting the target resonant module and the target inverter module includes: The second switch corresponding to the target resonant module is controlled to turn on the branch between the target resonant module and the first switch; The first switch corresponding to the target resonant module is controlled to turn on the 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 resonant module to turn on the branch between the target resonant module and the first switch, the method further includes: When the target inverter module is in operation, stop sending drive pulse signals to the target inverter module; After the first switch corresponding to the target resonant module is turned on to connect the branch between the target resonant module and the target inverter module, the method further includes: Send a drive pulse signal to the target inverter module.

15. A control device for an electrical appliance, characterized in that, The electrical equipment includes the electromagnetic heating circuit as described in any one of claims 1 to 7, and the device includes: The first determining unit is used to determine the target resonant module among N resonant modules, wherein the target resonant module refers to the resonant module covered by the pot. The second determining unit is used to determine the target inverter module among the M inverter modules; A conduction unit is used to connect the branch between the target resonant module and the target inverter module; The third determining unit is used to determine whether the first switch corresponding to the target resonant module is in normal working condition 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 in the branch where the target resonant module is located.

16. An electrical appliance, characterized in that, The electrical device includes an electromagnetic heating circuit as described in any one of claims 1 to 7, wherein the control module of the electromagnetic heating circuit includes: One or more processors; Memory; and One or more applications, wherein the one or more said applications are stored in the memory and configured to be executed by one or more said processors and configured to perform the method as described in 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 that can be invoked by a processor to perform the method as described in any one of claims 8 to 14.

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