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

Abstract

This application discloses an electromagnetic heating circuit, a control method, a device, and an electrical device. The electromagnetic heating circuit includes N resonant modules, an inverter module, N pot detection modules corresponding one-to-one with the N resonant modules, N switching switches corresponding one-to-one with the N resonant modules, a first expansion module, and a control module. The first expansion module may include multiple first expansion units, with any N first connection terminals of the multiple first expansion units connected one-to-one with the N pot detection modules. A first common connection terminal is connected to a first interface of the control module, allowing the control module to receive N pot detection signals output by the N pot detection modules through multiple first interfaces, while the number of first interfaces is much smaller than the number of pot detection modules. Therefore, the electromagnetic heating circuit in this application can expand the input of the control module by setting a first expansion module, thereby saving interface resources of the control module and reducing the difficulty of chip selection.

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] In order to accurately control multiple coils, the multi-burner stove needs to collect multiple signals, such as coil temperature signals, current signals, etc. The control chip inside the multi-burner stove processes these multiple signals to complete the heating task of the cookware.

[0004] However, the signal ports of the control chip are limited, making it difficult for the control chip to process multiple signals, which increases the difficulty of chip selection. 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 N resonant modules, an inverter module, N pot detection modules corresponding one-to-one with the N resonant modules, N switching switches corresponding one-to-one with the N resonant modules, a first expansion module, and a control module, where N is an integer greater than 1. The pot detection module is used to detect whether the resonant modules are covered by a pot. The switching switch has a first common terminal, a first movable terminal, a first position terminal, and a second position terminal. The first movable terminal and the first common terminal are connected; the first common terminal is connected to the resonant module, the first position terminal is connected to the pot detection module, and the second position terminal is connected to the inverter module. The first expansion module includes multiple first expansion units, each including a first common connection terminal, a first redundant connection terminal, and multiple first connection terminals; the total number of first connection terminals included in the multiple first expansion units is greater than or equal to N, and any N first connection terminals in the multiple first expansion units are connected one-to-one with the N pot detection modules; the first redundant connection terminal is connected to the first common connection terminal of a first designated expansion unit in the multiple first expansion units. The control module is electrically connected to the inverter module and N switching switches respectively; the control module includes multiple first interfaces, which are connected one-to-one to the first common connection terminal of multiple first expansion units.

[0007] Secondly, some embodiments of this application also provide a control method for an electrical device, the electrical device including the electromagnetic heating circuit described above. The method includes: in response to a detection indication, determining a first target extension unit, the first target extension unit being a first extension unit to be detected; controlling the branch connection between the first target extension unit and a target pot detection module; connecting the target pot detection module to a first designated extension unit connected to a first redundant connection terminal of the first target extension unit; acquiring a first pot detection signal sent by the target pot detection module through a first interface connected to the first target extension unit; and determining whether the first target extension unit is in a normal working state based on the first pot detection signal.

[0008] Thirdly, some embodiments of this application also provide a control device for an electrical appliance, the electrical appliance including the aforementioned electromagnetic heating circuit. The device includes a first determining unit, a first controlling unit, a first acquiring unit, and a first judging unit. The first determining unit is used to determine a first target extension unit in response to a detection indication; the first target extension unit is a first extension unit to be detected. The first controlling unit is used to control the branch connection between the first target extension unit and the target pot detection module; the target pot detection module is connected to a first designated extension unit connected to the first redundant connection terminal of the first target extension unit. The first acquiring unit is used to acquire a first pot detection signal sent by the target pot detection module through a first interface connected to the first target extension unit. The first judging unit is used to judge whether the first target extension unit is in a normal working state based on the first pot detection signal.

[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, an apparatus, and an electrical device. The electromagnetic heating circuit includes N resonant modules, an inverter module, N pot detection modules corresponding one-to-one with the N resonant modules, N switching switches corresponding one-to-one with the N resonant modules, a first expansion module, and a control module. The first expansion module may include multiple first expansion units, each including a first common connection terminal, a first redundant connection terminal, and multiple first connection terminals. Any N first connection terminals of the multiple first expansion units are connected one-to-one with the N pot detection modules, and the first common connection terminal is connected to a first interface of the control module. This allows the control module to receive N pot detection signals output from the N pot detection modules through multiple first interfaces, where the number of first interfaces is much smaller than the number of pot detection modules. Therefore, the electromagnetic heating circuit in this application, by setting a first expansion module, can expand the input of the control module, thereby saving interface resources of the control module and reducing the difficulty of chip selection.

[0013] Furthermore, the first redundant connection terminal of the first expansion unit is connected to the first common connection terminal of the first designated expansion unit among multiple first expansion units. The first designated expansion unit and the first expansion unit containing the first redundant connection terminal are different. That is, the first redundant connection terminal of each first expansion unit in this application is connected to the first common connection terminal of other first expansion units (i.e., the first designated expansion unit). Therefore, when the control module detects one of the first expansion units, it can control the first expansion unit to close the branch between its first common connection terminal and the first redundant connection terminal, and obtain the first pot detection signal through the first interface connected to the first common connection terminal. Here, the first pot detection signal is the pot detection signal received by the first designated expansion unit connected to the first redundant connection terminal.

[0014] Finally, the control module determines whether the first expansion unit is in normal working condition based on the first pot detection signal. For example, if the signal parameters of the first pot detection signal are within the normal range, it indicates that the branch between the first common connection terminal and the first redundant connection terminal has been successfully closed, and the control module can control the first expansion unit normally, indicating that the first expansion unit is in normal working condition. Conversely, if the signal parameters of the first pot detection signal are not within the normal range, it indicates that the first expansion unit has malfunctioned, and the control module can issue an alarm message to remind the user to repair the electrical equipment in a timely manner. 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 structure of the first extension module.

[0019] Figure 4 yes Figure 2 A schematic diagram of the inverter unit.

[0020] Figure 5 yes Figure 2 The diagram shows the signal waveforms corresponding to the electromagnetic heating circuit.

[0021] Figure 6 yes Figure 2 A schematic diagram of the structure of the resonant module.

[0022] Figure 7 yes Figure 2 A schematic diagram of the intermediate inspection pot module.

[0023] Figure 8 yes Figure 2 A schematic diagram of the medium current detection module.

[0024] Figure 9 yes Figure 2 A schematic diagram of the structure of the second extension module.

[0025] Figure 10 yes Figure 2 A schematic diagram of the medium temperature detection module.

[0026] Figure 11 yes Figure 2 A schematic diagram of the structure of the third extension module.

[0027] Figure 12 This is a flowchart illustrating a control method for an electrical device provided in the first embodiment of this application.

[0028] Figure 13 This is a flowchart illustrating a control method for an electrical device provided in the second embodiment of this application.

[0029] Figure 14 This is a flowchart illustrating a control method for an electrical device provided in the third embodiment of this application.

[0030] Figure 15 This is a flowchart illustrating a control method for an electrical device provided in the fourth embodiment of this application.

[0031] Figure 16 This is a block diagram of a control device for an electrical appliance provided in an embodiment of this application.

[0032] Figure 17 This is a block diagram of the electrical equipment provided in the embodiments of this application.

[0033] Figure 18 This is a block diagram of a computer-readable storage medium provided in an embodiment of this application. Detailed Implementation

[0034] 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.

[0035] The electromagnetic heating circuit, electrical equipment, and control method applied to the electrical equipment proposed in this application will be further described below with reference to specific embodiments and accompanying drawings.

[0036] Please see Figure 1 This application provides an electromagnetic heating circuit 100 and an electrical appliance 200 equipped with the electromagnetic heating circuit 100. The electrical appliance 200 is a device that heats a pot placed above it based on the phenomenon of electromagnetic induction. For example, the electrical appliance 200 can be a multi-burner stove, an induction cooker, etc.

[0037] In this embodiment, 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. It is used to operate according to the control operations received by 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.

[0038] 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.

[0039] 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.

[0040] 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, so as to cook the food placed inside the pot.

[0041] 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.

[0042] 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 1In 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.

[0043] Please see Figure 2 and Figure 3 The electromagnetic heating circuit 100 may include an inverter module 10, N resonant modules 20, N pot detection modules 30 corresponding to the N resonant modules 20, N switching switches 40 corresponding to the N resonant modules 20, a first expansion module 520, and a control module 70, where N is an integer greater than 1. The pot detection modules 30 are used to detect whether the resonant modules 20 are covered by a pot. The switching switches 40 may have a first common terminal 410, a first movable terminal 430, a first position terminal 450, and a second position terminal 470. The first movable terminal 430 is connected to the first common terminal 410; the first common terminal 410 is connected to the resonant module 20; the first position terminal 450 is connected to the pot detection module 30; and the second position terminal 470 is connected to the inverter module 10.

[0044] The first expansion module 520 may include a plurality of first expansion units 521. Each first expansion unit 521 may include a first common connection terminal 5210, a first redundant connection terminal 5212, and a plurality of first connection terminals 5214. The total number of first connection terminals 5214 included in the plurality of first expansion units 521 is greater than or equal to N. Any N first connection terminals 5214 in the plurality of first expansion units 521 are connected one-to-one with N pot detection modules 30. The first redundant connection terminal 5212 is connected to the first common connection terminal 5210 of the first designated expansion unit in the plurality of first expansion units 521.

[0045] It should be noted here that the first designated expansion unit and the first redundant connection terminal 5212 are located in different first expansion units 521. That is, the first redundant connection terminal 5212 of each first expansion unit 521 in this application is connected to the first common connection terminal 5210 of other first expansion units 521 (i.e., the first designated expansion unit). For example, in... Figure 3In the illustrated embodiment, there are two first expansion units 521, namely, first expansion unit 521a and first expansion unit 521b. The first redundant connection terminal 5212 of the first expansion unit 521a is connected to the first common connection terminal 5210 of the first expansion unit 521b, and the first redundant connection terminal 5212 of the first expansion unit 521b is connected to the first common connection terminal 5210 of the first expansion unit 521a. It is easy to understand that, for the first expansion unit 521a, the first expansion unit 521b is the first designated expansion unit; and for the first expansion unit 521b, the first expansion unit 521a is the first designated expansion unit.

[0046] The control module 70 is electrically connected to the inverter module 10 and N switching switches 40 respectively. The control module 70 includes multiple first interfaces 700, which are connected one-to-one to the first common connection terminal 5210 of multiple first expansion units 521.

[0047] In the electromagnetic heating circuit 100 provided in this application, since any N first connection terminals 5214 of the plurality of first expansion units 521 are connected one-to-one to N pot detection modules 30, and the first common connection terminal 5210 is connected to the first interface 700 of the control module 70, the control module 70 can receive N pot detection signals output by the N pot detection modules 30 through the plurality of first interfaces 700, and the number of first interfaces 700 is much smaller than the number of pot detection modules 30. For example, in Figure 3 In the illustrated embodiment, the control module 70 can receive N pot detection signals through two first interfaces 700. Therefore, the electromagnetic heating circuit 100 in this application can expand the input of the control module 70 by setting the first expansion module 520, thereby saving the interface resources of the control module 70 and reducing the difficulty of chip selection.

[0048] Furthermore, since the first redundant connection terminal 5212 of the first expansion unit 521 is connected to the first common connection terminal 5210 of the first designated expansion unit among the multiple first expansion units 521, when the control module 70 detects one of the first expansion units 521, it can control the first expansion unit 521 to close the branch between its first common connection terminal 5210 and the first redundant connection terminal 5212, and obtain the first pot detection signal through the first interface 700 connected to the first common connection terminal 5210. Here, the first pot detection signal is the pot detection signal received by the first designated expansion unit connected to the first redundant connection terminal 5212.

[0049] Finally, the control module determines whether the first expansion unit 521 is in normal working condition based on the first pot detection signal. For example, if the signal parameters of the first pot detection signal are within the normal range, it indicates that the branch between the first common connection terminal 5210 and the first redundant connection terminal 5212 has been successfully closed, and the control module 70 can control the first expansion unit 521 normally, indicating that the first expansion unit 521 is in normal working condition. Conversely, if the signal parameters of the first pot detection signal are not within the normal range, it indicates that the first expansion unit 521 has malfunctioned, and the control module 70 can issue an alarm message to remind the user to repair the electrical equipment 200 in a timely manner.

[0050] The specific implementation methods of each module in the electromagnetic heating circuit 100 are described below.

[0051] The inverter module 10 is used to supply power to N resonant modules 20. Specifically, the inverter module 10 can output alternating current to the resonant modules 20, thereby causing the coils in the resonant modules 20 to generate an alternating magnetic field, which in turn heats the cookware placed in the alternating magnetic field.

[0052] In this embodiment, the inverter module 10 may include M inverter units 120. Each inverter unit 120 has a signal terminal 1210 and an output terminal 1230. The signal terminal 1210 is connected to the control module 70, and the output terminal 1230 is connected to N resonant modules 20. M can be an integer greater than 0. Specifically, M can be equal to 1, 2, 3, etc. In this embodiment, the value of M is equal to the number of cookware that can be simultaneously heated on the electromagnetic heating circuit 100. Figure 1 In the illustrated embodiment, two pots can be placed simultaneously on the 25 coils 250 corresponding to the electromagnetic heating circuit 100, thus requiring two inverter units 120. Therefore, when two pots need to be heated simultaneously, different inverter units 120 can independently control the multiple coils covered by different pots, while multiple coils covered by the same pot are controlled by the same inverter unit 120, enabling the two pots to be heated independently. Therefore, in this embodiment, the drive pulse signals output by the control module 70 to different inverter units 120 are not the same. The control module 70 can adjust the heating power of different pots by adjusting the signal parameters of the drive pulse signals (e.g., duty cycle, signal frequency).

[0053] In some possible embodiments, inverter unit 120 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 4The inverter unit 120 has two signal terminals 1210, including a first signal terminal 1212 and a second signal terminal 1214. The first signal terminal 1212 and the second signal terminal 1214 are respectively connected to the control module 70. The first signal terminal 1212 can be used to input a first pulse signal PWM_H, and the second signal terminal 1214 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 5 , Figure 5 Part (a) in the figure shows the waveform curve of the first pulse signal PWM_H. Figure 5 Part (b) in the figure shows the waveform curve of the second pulse signal PWM_L.

[0054] Please refer to it again. Figure 4 The inverter unit 120 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 first power supply terminal 21, the control terminal 12 of the first switch Q1 is connected to the first signal terminal 1212, 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 1214, 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), wherein 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 unit 120 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 first 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.

[0055] 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.

[0056] In this embodiment, please refer again. Figure 2 The electromagnetic heating circuit 100 may also include N source selection switches 80 corresponding to N resonant modules 20. The source selection switches 80 are connected between M inverter units 120 and resonant modules 20, and are used to conduct the branch between one of the inverter units 120 and the resonant module 20.

[0057] The source selection switch 80 has a second common terminal 810, a second movable terminal 830, and M third position terminals 850. The second movable terminal 830 is connected to the second common terminal 810. The M third position terminals 850 are connected one-to-one to the output terminals 1230 of the M inverter units 120. The second common terminal 810 is connected to the resonant module 20 corresponding to the source selection switch 80. Figure 2 In the embodiment shown, the second common terminal 810 is connected to the second position terminal 470 of the switching switch 40.

[0058] Therefore, when the second active terminal 830 is connected to different third position terminals 850, the source selection switch 80 can connect different branches between the inverter unit 120 and the resonant module 20 connected to the source selection switch 80. Specifically, the source selection switch 80 can be a relay switch, for example, a single-pole multi-throw relay. When M is 2, the source selection switch 80 can be a single-pole double-throw relay.

[0059] In this embodiment, the resonant module 20 is used to generate an alternating magnetic field under the excitation of an alternating current. Please refer to [link / reference]. Figure 6The resonant module 20 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 first power supply terminal 21, and the other end is grounded. The first end 212 of the coil LX is connected to the first common terminal 410 of the switching switch 40, and the second end 214 is connected to the common terminal between the first resonant capacitor CX1 and the second resonant capacitor CX2. Specifically, when the branch between the resonant module 20 and one of the inverter units 120 is conducting, the coil LX and the second resonant capacitor CX2 resonate when the first switch Q1 in the inverter unit 120 is turned on; and the coil LX and the first resonant capacitor CX1 resonate when the second switch Q2 in the inverter unit 120 is turned on.

[0060] It should be noted here that the coil LX in the resonant module 20 is... Figure 1 The intermediate coil 250, therefore, in this embodiment, the intermediate resonant module 20 and the coil 250 have a one-to-one correspondence. Therefore, when the electromagnetic heating circuit 100 is used to control 25 coils 250, the number of resonant modules 20 is also 25, that is, N is 25.

[0061] In this embodiment, the switching switch 40 is connected to the resonant module 20, the boiler detection module 30, and the inverter module 10, respectively. It is used to connect the branch between the resonant module 20 and the boiler detection module 30, or the branch between the resonant module 20 and the inverter module 10. The switching switch 40 may have a first common terminal 410, a first movable terminal 430, a first position terminal 450, and a second position terminal 470. The first movable terminal 430 is connected to the first common terminal 410. The first common terminal 410 is connected to the resonant module 20, the first position terminal 450 is connected to the boiler detection module 30, and the second position terminal 470 is connected to the output terminal 140 of the inverter unit 120. Specifically, in... Figure 2 In the embodiment shown, the first common terminal 410 is connected to the first terminal 212 of the coil LX in the resonant module 20, and the second position terminal 470 is connected to the second common terminal 810 of the source selection switch 80 corresponding to the resonant module 20.

[0062] Therefore, when the first active terminal 430 is connected to the first position terminal 450, the switching switch 40 can connect the branch between the resonant module 20 and the pot detection module 30, enabling the pot detection module 30 to detect whether a pot is placed above the resonant module 20; when the first active terminal 430 is connected to the second position terminal 470, the switching switch 40 can connect the branch between the resonant module 20 and the inverter module 10, enabling the inverter module 10 to supply power to the resonant module 20. Specifically, the switching switch 40 can be a relay switch, such as a single-pole double-throw relay.

[0063] It should be noted that, in order to prevent the inverter module 10 from supplying power to the resonant module 20 when the resonant module 20 is not covered by the pot, in this embodiment, the second position terminal 470 of the switching switch 40 is a normally open contact of a single-pole double-throw relay, and the first position terminal 450 is a normally closed contact of a single-pole double-throw relay.

[0064] In this embodiment, the pot detection module 30 is used to detect whether the resonant module 20 is covered by a pot. Specifically, when the branch between the resonant module 20 and the pot detection module 30 is conducting, and the resonant module 20 is covered by a pot, the inductance value of the coil LX in the resonant module 20 will change. The pot detection module 30 can output pot detection signals of different frequencies to the control module 70 based on the change in the coil inductance value. The control module 70 then determines whether the resonant module 20 is covered by a pot based on the aforementioned pot detection signals. Please refer to [link to relevant documentation]. Figure 7 The pot detection module 30 may include an oscillation unit 310, a voltage pull-up unit 330, and a signal comparison unit 350.

[0065] The oscillation unit 310 is provided with a detection terminal 3100, which is connected to the first position terminal 450 of the switching switch 40. The detection terminal 3100 is used to output a detection signal, which is used to characterize the change in inductance value of the resonant module connected to the oscillation unit 310.

[0066] In some possible embodiments, the oscillation unit 310 can be an oscillation circuit (e.g., an inductive three-point oscillation circuit or a capacitive three-point oscillation circuit). Here, we will describe the oscillation unit 310 as a capacitive three-point oscillation circuit. Specifically, the oscillation unit 310 may include a transistor Q3, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and an inductor L. The control terminal 31 of transistor Q3 is connected to the second power supply terminal 23 through the third resistor R3 and grounded through the fourth resistor R4. The first terminal 33 of transistor Q3 is connected to the detection terminal 3100 and connected to the second power supply terminal 23 through the fifth resistor R5. The second terminal 35 of transistor Q3 is grounded through the sixth resistor R6. The second power supply terminal 23 is used to provide a first power supply voltage VDD, which is a DC voltage; for example, the amplitude of the first power supply voltage VDD can be 2.5V, 3V, etc.

[0067] In one implementation, transistor Q3 can be a bipolar junction transistor (BJT). The control terminal 31 of transistor Q3 is the base of the BJT, the first terminal 33 of transistor Q3 is the collector of the BJT, and the second terminal 35 of transistor Q3 is the emitter of the BJT. Resistors R3, R4, R5, and R6 are current-limiting resistors. Specifically, resistors R3 and R4 limit the base current of the BJT, R5 limits the collector current, and R6 limits the emitter current.

[0068] The first capacitor C1 is connected between the first terminal 33 and the second terminal 35 of transistor Q3. The second capacitor C2 is connected in parallel with the sixth resistor R6, and the third capacitor C3 is connected in parallel with the fourth resistor R4. One end of the fourth capacitor C4 connected in series with the inductor L is connected to the detection terminal 3100, and the other end is grounded. Therefore, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, and the inductor L form an oscillation circuit. When the pot detection module 30 is not connected to the resonant module 20, the signal frequency of the detection signal output from the detection terminal 3100 is the resonant frequency formed by the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, and the inductor L.

[0069] When the detection module 30 is connected to the resonant module 20, the coil LX, the first resonant capacitor CX1, and the second resonant capacitor CX2 in the resonant module 20 are connected to the oscillation unit 310. Specifically, the resonant circuit formed by the coil LX, the first resonant capacitor CX1, and the second resonant capacitor CX2 can be considered as being connected in parallel with the branch containing the fourth capacitor C4 and the inductor L. At this time, the signal frequency of the detection signal output by the detection terminal 3100 is the resonant frequency formed by the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the inductor L, the coil LX, the first resonant capacitor CX1, and the second resonant capacitor CX2. Specifically, the signal frequency of the detection signal can be determined according to the following frequency calculation formula.

[0070]

[0071] Where f is the signal frequency of the detection signal, L is the equivalent inductance of the oscillation unit 310 and the resonant module 20, and C is the equivalent capacitance of the oscillation unit 310 and the resonant module 20. Specifically, when the resonant module 20 is covered by the pot, the equivalent inductance of the coil LX decreases, and the equivalent inductance of the oscillation unit 310 and the resonant module 20 also decreases, resulting in an increase in the signal frequency of the detection signal.

[0072] A voltage pull-up unit 330 is connected between the detection terminal 3100 of the oscillation unit 310 and the non-inverting input terminal 3501 of the signal comparison unit 350. It is used to pull up the voltage value of the detection signal, ensuring that the pulled-up detection signal can be smoothly input to the signal comparison unit 350. Specifically, the voltage pull-up unit 330 includes a seventh resistor R7 and an eighth resistor R8. The seventh resistor R7 is connected between the second power supply terminal 23 and the non-inverting input terminal 3501, and one end of the eighth resistor R8 is connected to the non-inverting input terminal 3501, while the other end is grounded. The seventh resistor R7 and the eighth resistor R8 are voltage divider resistors, used to divide the first power supply voltage VDD input to the second power supply terminal 23. Therefore, the voltage input to the non-inverting input terminal 3501 of the signal comparison unit 350 is the superposition of the divided VDD and the detection signal.

[0073] In some possible embodiments, the voltage pull-up unit 330 may further include a fifth capacitor C5, one end of which is connected to the detection terminal 3100 of the oscillation unit 310, and the other end is connected to the non-inverting input terminal 3501. The fifth capacitor C5 is an isolation capacitor, capable of isolating the first supply voltage VDD input to the transistor Q3 in the oscillation unit 310, thereby preventing the first supply voltage VDD from affecting the signal input of the signal comparison unit 350.

[0074] The inverting input terminal 3503 of the signal comparison unit 350 is used to input the first reference voltage Vref1, and the output terminal 3505 of the signal comparison unit 350 is connected to the control module 70, which is used to output a pot detection signal to the control module 70. Specifically, the signal comparison unit 350 includes a voltage comparator 3500, a ninth resistor R9, and a sixth capacitor C6.

[0075] The non-inverting input 3501 of voltage comparator 3500 is connected to the voltage pull-up unit 330, the inverting input 3503 of voltage comparator 3500 is used to input the first reference voltage Vref1, and the output 3505 of voltage comparator 3500 is connected to the control module 70. Specifically, the first reference voltage Vref1 can be determined based on the voltage value after the first supply voltage VDD is divided by the seventh resistor R7 and the eighth resistor R8; for example, the two can be approximately equal. Voltage comparator 3500 is used to compare the voltage magnitude between the non-inverting input 3501 and the inverting input 3503. When the input voltage of the non-inverting input 3501 is greater than the input voltage of the inverting input 3503, the output 3505 of voltage comparator 3500 can output a high-level signal; when the input voltage of the non-inverting input 3501 is less than the input voltage of the inverting input 3503, the output 3505 of voltage comparator 3500 can output a low-level signal. Therefore, in this embodiment, the pot detection signal is a square wave signal, and the signal frequency of the square wave signal is the same as the signal frequency of the detection signal, so that the control module 70 can determine whether the resonant module 20 is covered by a pot based on the pot detection signal.

[0076] The ninth resistor R9 is connected between the second power supply terminal 23 and the output terminal 3505 of the voltage comparator 3500. In this embodiment, the ninth resistor R9 is an output pull-up resistor, which is used to ensure the normal output of the pot detection signal. One end of the sixth capacitor C6 is connected to the output terminal 3505 of the voltage comparator 3500, and the other end is grounded. In this embodiment, the sixth capacitor C6 is a filter capacitor, which is used to filter out noise signals in the pot detection signal and prevent noise signals from affecting the pot detection signal.

[0077] In some possible embodiments, the pot detection module 30 may further include an isolation unit 370, which is connected between the detection terminal 3100 of the oscillation unit 310 and the first position terminal 450 of the switching switch 40. This isolation unit isolates the DC voltage VBUS input to the resonant module 20 to prevent it from affecting the normal operation of the oscillation unit 310. Specifically, the isolation unit 370 may include a seventh capacitor C7, which is connected between the detection terminal 3100 of the oscillation unit 310 and the first position terminal 450 of the switching switch 40. It is easy to understand that when the pot detection module 30 is connected to the resonant module 20, the seventh capacitor C7 and the aforementioned fifth capacitor C5 will also participate in the resonance between the pot detection module 30 and the resonant module 20.

[0078] In this embodiment, the first expansion module 520 is connected between the control module 70 and the N pot detection modules 30, and is used to enable the control module 70 to expand the input of the N pot detection signals. The first expansion module 520 may include multiple first expansion units 521, each including a first common connection terminal 5210, a first redundant connection terminal 5212, and multiple first connection terminals 5214. The total number of first connection terminals 5214 included in the multiple first expansion units 521 is greater than or equal to N. Any N first connection terminals 5214 of the multiple first expansion units 521 are connected one-to-one with the N pot detection modules 30; the first redundant connection terminal 5212 is connected to the first common connection terminal 5210 of the first designated expansion unit among the multiple first expansion units 521.

[0079] Specifically, in this embodiment, any N first connection terminals 5214 of the plurality of first expansion units 521 are connected one-to-one with the output terminals 3505 of the voltage comparators 3500 of the N pot detection modules 30. The control module 70 may include a plurality of first interfaces 700, which are connected one-to-one with the first common connection terminals 5210 of the plurality of first expansion units 521.

[0080] This section uses an example where the first extension unit 521 has two units. Please refer to [link / reference needed]. Figure 3 The two first expansion units 521 include a first expansion unit 521a and a first expansion unit 521b, wherein the first redundant connection terminal 5212 of the first expansion unit 521a is connected to the first common connection terminal 5210 of the first expansion unit 521b, and the first redundant connection terminal 5212 of the first expansion unit 521b is connected to the first common connection terminal 5210 of the first expansion unit 521a.

[0081] Specifically, the first expansion unit 521 can be a multiplexer switch, the first redundant connection terminal 5212 and multiple first connection terminals 5214 are the selection terminals of the multiplexer switch, and the first common connection terminal 5210 is the common terminal of the multiplexer switch. The model and number of multiplexers can be determined according to the number of pot detection modules 30, and this embodiment does not impose a specific limitation. Here, we take N=25 as an example. When there are two first expansion units 521, the first expansion unit 521 can be a 16-to-1 analog switch. Therefore, the two first expansion units 521 have a total of 30 first connection terminals 5214, and any 25 of the 30 first connection terminals 5214 are connected one-to-one with 25 pot detection modules 30.

[0082] In some other possible embodiments, the number of first expansion units 521 is three, four, etc. In this case, the first redundant connection terminal 5212 of each first expansion unit 521 is connected to the first common connection terminal 5210 of other first expansion units 521 (that is, the first designated expansion unit). This embodiment does not specifically limit the specific connection method of multiple first expansion units 521.

[0083] In this embodiment, the first expansion unit 521 may also be provided with a first control terminal (not shown in the figure), and the control module 70 is electrically connected to the first control terminal. This first control terminal is used to receive a first control signal sent by the control module 70, causing the first expansion unit 521, under the action of the first control signal, to connect the branch between the designated first connection terminal 5214 and the first common connection terminal 5210, or to connect the branch between the designated first redundant connection terminal 5212 and the first common connection terminal 5210. Specifically, the first control terminal may be the control signal terminal of a multiplexer switch.

[0084] Therefore, the control module 70 can receive N pot detection signals output by N pot detection modules 30 through multiple first interfaces 700, while the number of first interfaces 700 is much smaller than the number of pot detection modules 30. For example, in Figure 3 In the illustrated embodiment, the control module 70 can receive N pot detection signals through two first interfaces 700. Therefore, the electromagnetic heating circuit 100 in this application can expand the input of the control module 70 by setting the first expansion module 520, thereby saving the interface resources of the control module 70 and reducing the difficulty of chip selection.

[0085] Furthermore, in this embodiment, each first expansion unit 521 reserves a connection terminal (i.e., a first redundant connection terminal 5212) to connect with the first common connection terminal 5210 of other first expansion units 521, so that the control module 70 can realize anomaly detection of the first expansion unit 521. Specifically, the specific implementation method of the control module 70 in detecting anomalies in the first expansion unit 521 is described in detail in the following method embodiment.

[0086] In this embodiment, the electromagnetic heating circuit 100 may further include N current detection modules 50 corresponding one-to-one with the N resonant modules 20. The current detection module 50 is connected between the first common terminal 410 of the switching switch 40 and the resonant module 20. It is used to acquire current detection signals, which are used to characterize the current change in the branch where the current detection module 50 is located.

[0087] Please see Figure 8The current detection module 50 may include a current detection unit 520 and a voltage conversion unit 540. The input terminal 5200 of the current detection unit 520 is connected between the first common terminal 410 of the switching switch 40 and the resonant module 20, and is used to acquire the current signal of the branch where the current detection unit 520 is located.

[0088] Specifically, 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 first common terminal 410 of the switching switch 40, and the second input terminal 5203 is connected to the first terminal 212 of the coil LX in the resonant module 20. Therefore, the current detection unit 520 is connected in series in the branch where the resonant module 20 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 current detection unit 520 is located. Please refer again. Figure 5 , Figure 5 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 current detection unit 520 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.

[0089] 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 20 are respectively connected to the mains power, the current value of the branch where the resonant module 20 is located is relatively large. Therefore, a current transformer is needed to reduce the current value to match the subsequent circuit. 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 and the second output terminal 5223 are used to connect to the voltage conversion unit 540, and the second output terminal 5223 is grounded.

[0090] A voltage conversion unit 540 is connected between the output terminal 5220 of the current detection unit 520 and the control module 70, and is used to convert the current signal into a current detection signal. Specifically, the voltage conversion unit 520 includes a diode D, a first resistor R1, and a second resistor R2.

[0091] The first resistor R1 is connected between the first output terminal 5221 and the second output terminal 5221. It is used to convert the current signal output by the current detection unit 520 into a voltage signal across the first resistor R1. The anode of the diode D is connected to the first output terminal 5221, and the cathode of the diode D is connected to the current detection terminal 52, which is used to connect to the control module 70. 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 current detection unit 520 is located. The diode D is used to rectify the voltage signal, so that the rectified voltage signal retains only the positive half-cycle signal. Please refer again. Figure 5 , Figure 5 Part (d) in the figure is the waveform of the signal output by the current detection terminal 52 (i.e., the current detection signal).

[0092] One end of the second resistor R2 is connected to the cathode of diode D, and the other end is connected to the second output terminal 5223. The second resistor R2 serves to shunt the current detection signal, thereby reducing the amplitude of the current detection signal and allowing the current detection signal to be smoothly input into the control module 70.

[0093] In this embodiment, the electromagnetic heating circuit 100 may further include a second expansion module 540, which is connected between the control module 70 and the N current detection modules 50. The second expansion module 540 is used to enable the control module 70 to input and expand the N current detection signals. (See also...) Figure 9 The second expansion module 540 may include multiple second expansion units 541. Each second expansion unit 541 includes a second common connection terminal 5410, a second redundant connection terminal 5412, and multiple second connection terminals 5414. The total number of second connection terminals 5414 included in the multiple second expansion units 541 is greater than or equal to N. Any N second connection terminals 5414 in the multiple second expansion units 541 are connected one-to-one with N current detection modules 50. The second redundant connection terminal 5412 is connected to the second common connection terminal 5410 of the second designated expansion unit in the multiple second expansion units 541. It should be noted that the second expansion unit 541 containing the second designated expansion unit and the second redundant connection terminal 5412 is different.

[0094] Specifically, in this embodiment, any N second connection terminals 5414 of the plurality of second expansion units 541 are connected one-to-one with the current detection terminals 52 of the N current detection modules 50. The control module 70 may also include a plurality of second interfaces 720, which are connected one-to-one with the second common connection terminals 5410 of the plurality of second expansion units 541.

[0095] This section uses the example of two second extension units 541 for illustration. Figure 9In the illustrated embodiment, the two second expansion units 541 include a second expansion unit 541a and a second expansion unit 541b. The second redundant connection terminal 5412 of the second expansion unit 541a is connected to the second common connection terminal 5410 of the second expansion unit 541b, and the second redundant connection terminal 5412 of the second expansion unit 541b is connected to the second common connection terminal 5410 of the second expansion unit 541a. It is readily understood that, for the second expansion unit 541a, the second expansion unit 541b is the second designated expansion unit; and for the second expansion unit 541b, the second expansion unit 541a is the second designated expansion unit.

[0096] Specifically, the second expansion unit 541 can be a multiplexer switch, the second redundant connection terminal 5412 and multiple second connection terminals 5414 are the selection terminals of the multiplexer switch, and the second common connection terminal 5410 is the common terminal of the multiplexer switch. The model and number of multiplexers can be determined according to the number of current detection modules 50, and this embodiment does not impose a specific limitation. Here, taking N as 25 as an example, when there are two second expansion units 541, the second expansion unit 541 can be a 16-to-1 analog switch. Therefore, the two second expansion units 541 have a total of 30 second connection terminals 5414, and any 25 of the 30 second connection terminals 5414 are connected one-to-one with 25 current detection modules 50.

[0097] In some other possible embodiments, the number of second expansion units 541 is three, four, etc. In this case, the second redundant connection terminal 5412 of each second expansion unit 541 is connected to the second common connection terminal 5410 of other second expansion units 541 (that is, the second designated expansion unit). This embodiment does not specifically limit the specific connection method of multiple second expansion units 541.

[0098] In this embodiment, the second expansion unit 541 may also be provided with a second control terminal (not shown in the figure), and the control module 70 is electrically connected to the second control terminal. This second control terminal is used to receive a second control signal sent by the control module 70, causing the second expansion unit 541, under the action of the second control signal, to either connect the branch between the designated second connection terminal 5414 and the second common connection terminal 5410, or connect the branch between the designated second redundant connection terminal 5412 and the second common connection terminal 5410. Specifically, the second control terminal may be the control signal terminal of a multiplexer switch.

[0099] Therefore, the control module 70 can receive N current detection signals output by N current detection modules 50 through multiple second interfaces 720, while the number of second interfaces 720 is much smaller than the number of current detection modules 50. For example, in Figure 9In the illustrated embodiment, the control module 70 can receive N current detection signals through two second interfaces 720. Therefore, the electromagnetic heating circuit 100 in this application can expand the input of the control module 70 by setting the second expansion module 540, thereby saving the interface resources of the control module 70 and reducing the difficulty of chip selection.

[0100] Furthermore, in this embodiment, each second expansion unit 541 reserves a connection terminal (i.e., a second redundant connection terminal 5412) to connect with the second common connection terminal 5410 of other second expansion units 541, enabling the control module 70 to perform anomaly detection on the second expansion unit 541. Specifically, the specific implementation method of the control module 70 in performing anomaly detection on the second expansion unit 541 is described in detail in the following method embodiment.

[0101] exist Figure 9 In the illustrated embodiment, the control module 70 includes multiple comparators 710 corresponding one-to-one with multiple second interfaces 720. The multiple comparators 710 can be built into the control module 70. The non-inverting input terminal of each comparator 710 is connected to the second interface 720; therefore, the input signal at the non-inverting input terminal of each comparator 710 is a current detection signal, i.e., Figure 5 The signal shown in part (d) is used for the second reference voltage Vref2. The inverting input of comparator 710 is used for this second reference voltage Vref2, which can be set by the control module 70. For example, the second reference voltage Vref2 can be... etc.

[0102] The signal output terminal 7100 of comparator 710 is used to output a PWM wave of a certain frequency. Specifically, when the amplitude of the current detection signal is greater than or equal to the second reference voltage Vref2, the PWM wave is at a high level; when the amplitude of the current detection signal is less than the second reference voltage Vref2, the PWM wave is at a low level. Therefore, comparator 710 can convert the input current detection signal into a PWM wave of the same frequency. Please refer again. Figure 5 , Figure 5 Part (e) in the diagram shows the waveform of the output signal of comparator 710.

[0103] In this embodiment, please refer again. Figure 2 The electromagnetic heating circuit 100 may further include N temperature detection modules 90 corresponding one-to-one with the N resonant modules 20. The temperature detection modules 90 are used to acquire the temperature information of the resonant modules 20. Each temperature detection module 90 may have a temperature detection terminal 92 connected to the control module 70, which outputs a temperature detection signal to the control module 70. The temperature detection signal is used to characterize the temperature of the space where the resonant modules 20 are located.

[0104] Please see Figure 10 The temperature detection module 90 may include a thermistor Rt, a tenth resistor R10, and an eighth capacitor C8. One end of the thermistor Rt is connected to one end of the tenth resistor R10 to form a common terminal 91, which is connected to the temperature detection terminal 92. The other end of the thermistor Rt is grounded, and the other end of the tenth resistor R10 is connected to the second power supply terminal 23. Therefore, the temperature detection signal output by the temperature detection terminal 92 is the voltage signal obtained by dividing the power supply voltage VDD by the thermistor Rt and the tenth resistor R10. Since the resistance value of the thermistor Rt changes with temperature, this temperature detection signal can reflect the temperature change of the space where the resonant module 20 is located.

[0105] One end of the eighth capacitor C8 is connected to the temperature detection terminal 92, and the other end is grounded. The eighth capacitor C8 is a filter capacitor, which is used to ensure that noise signals in the temperature detection signal are filtered out and to avoid noise signals affecting the temperature detection signal.

[0106] In this embodiment, the electromagnetic heating circuit 100 may further include a third expansion module 560, which is connected between the control module 70 and the N temperature detection modules 90. This third expansion module 560 is used to enable the control module 70 to input and expand the N temperature detection signals. Please refer to [link to relevant documentation]. Figure 11 The third expansion module 560 may include multiple third expansion units 561. Each third expansion unit 561 includes a third common connection terminal 5610, a third redundant connection terminal 5612, and multiple third connection terminals 5614. The total number of third connection terminals 5614 included in the multiple third expansion units 561 is greater than or equal to N. Any N third connection terminals 5614 in the multiple third expansion units 561 are connected one-to-one with N temperature detection modules 90. The third redundant connection terminal 5612 is connected to the third common connection terminal 5610 of the third designated expansion unit in the multiple third expansion units 561. It should be noted that the third designated expansion unit and the third redundant connection terminal 5612 are located in different third expansion units 561.

[0107] Specifically, in this embodiment, any N third connection terminals 5614 of the plurality of third expansion units 561 are connected one-to-one with the temperature detection terminals 92 of the N temperature detection modules 90. The control module 70 may also include a plurality of third interfaces 740, which are connected one-to-one with the third common connection terminals 5610 of the plurality of third expansion units 561.

[0108] This section uses the example of two third extension units 561 as an example. Figure 11In the embodiments, the two third expansion units 561 include a third expansion unit 561a and a third expansion unit 561b, wherein the third redundant connection terminal 5612 of the third expansion unit 561a is connected to the third common connection terminal 5610 of the third expansion unit 561b, and the third redundant connection terminal 5612 of the third expansion unit 561b is connected to the third common connection terminal 5610 of the third expansion unit 561a. It is easy to understand that, for the third expansion unit 561a, the third expansion unit 561b is the third designated expansion unit; and for the third expansion unit 561b, the third expansion unit 561a is the third designated expansion unit.

[0109] Specifically, the third expansion unit 561 can be a multiplexer switch, the third redundant connection terminal 5612 and multiple third connection terminals 5614 are the selection terminals of the multiplexer switch, and the third common connection terminal 5610 is the common terminal of the multiplexer switch. The model and number of multiplexers can be determined according to the number of temperature detection modules 90, and this embodiment does not impose a specific limitation. Here, we take N=25 as an example. When there are two third expansion units 561, the third expansion unit 561 can be a 16-to-1 analog switch. Therefore, the two third expansion units 561 have a total of 30 third connection terminals 5614, and any 25 of the 30 third connection terminals 5614 are connected one-to-one with 25 temperature detection modules 90.

[0110] In some other possible embodiments, the number of third expansion units 561 is three, four, etc. In this case, the third redundant connection terminal 5612 of each third expansion unit 561 is connected to the third common connection terminal 5610 of other third expansion units 561 (that is, the third designated expansion unit). This embodiment does not specifically limit the specific connection method of multiple third expansion units 561.

[0111] In this embodiment, the third expansion unit 561 may also be provided with a third control terminal (not shown in the figure), and the control module 70 is electrically connected to the third control terminal. This third control terminal is used to receive a third control signal sent by the control module 70, causing the third expansion unit 561 to, under the action of the third control signal, connect the branch between the designated third connection terminal 5614 and the third common connection terminal 5610, or connect the branch between the designated third redundant connection terminal 5612 and the third common connection terminal 5610. Specifically, the third control terminal may be the control signal terminal of a multiplexer switch.

[0112] Therefore, the control module 70 can receive N temperature detection signals output by N temperature detection modules 90 through multiple third interfaces 740, while the number of third interfaces 740 is much smaller than the number of temperature detection modules 90. For example, in Figure 11In this embodiment, the control module 70 can receive N temperature detection signals through two third interfaces 740. Therefore, the electromagnetic heating circuit 100 in this application can expand the input of the control module 70 by setting the third expansion module 560, thereby saving the interface resources of the control module 70 and reducing the difficulty of chip selection.

[0113] Furthermore, in this embodiment, each third expansion unit 561 reserves a connection terminal (i.e., a third redundant connection terminal 5612) to connect with the third common connection terminal 5610 of other third expansion units 561, enabling the control module 70 to perform anomaly detection on the third expansion unit 561. Specifically, the specific implementation method of the control module 70 in performing anomaly detection on the third expansion unit 561 is described in detail in the following method embodiment.

[0114] In this embodiment, the control module 70 is electrically connected to the inverter module 10. The control module 70 sends a drive pulse signal to the inverter module 10, which controls the inverter module 10 to supply power to the N resonant modules 20. In this embodiment, the control module 70 is also electrically connected to the first expansion module 520, the second expansion module 540, and the third expansion module 560, respectively, and the signal input expansion is achieved through the first expansion module 520, the second expansion module 540, and the third expansion module 560. Specifically, the control module 70 can be a control chip, and the specific control process of the control module 70 is described in detail in the following method embodiments.

[0115] The control method applied to the above-mentioned electrical equipment 200 is described below.

[0116] Please see Figure 12 , Figure 12 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.

[0117] Step S1210: In response to the detection indication, the first target extension unit is determined.

[0118] In this embodiment, the first target expansion unit is the first expansion unit to be detected among a plurality of first expansion units. As one implementation, the control module can sequentially perform fault detection on the plurality of first expansion units and determine the first expansion unit currently to be detected as the first target expansion unit.

[0119] In some possible embodiments, the detection indication may be automatically generated internally by the control module when the control module is powered on. For example, when an electrical device is powered on and started, the control module enters the power-on state. At this time, the control module generates a detection indication and determines the first target expansion unit based on the detection indication.

[0120] In other possible embodiments, the detection indication can be manually triggered by the user. For example, a button corresponding to fault detection can be provided on the function panel of the electrical appliance. If the user triggers this button, it indicates that the user has a need to detect faults in the electrical appliance. At this time, the function panel will send a detection indication to the control module, and the control module will then respond to the detection indication to determine the first target expansion unit.

[0121] Step S1220: Control the branch connection between the first target expansion unit and the target inspection module.

[0122] In this embodiment, the target detection module is connected to the first designated expansion unit connected to the first redundant connection terminal of the first target expansion unit. Please refer again. Figure 3 Taking the first target extension unit as the first extension unit 521a as an example, the first designated extension unit is the first extension unit 521b, and the target pot detection module can be any one of the multiple pot detection modules connected to the first extension unit 521b.

[0123] Therefore, when the control module controls the branch connection between the first target extension unit and the target detection module, it needs to control the branch connection between the first common connection terminal and the first redundant connection terminal included in the first extension unit 521a, and control the branch connection between the first common connection terminal included in the first extension unit 521b and the target detection module.

[0124] Step S1230: Obtain the first pot detection signal sent by the target pot detection module through the first interface connected to the first target expansion unit.

[0125] In this embodiment, the control module obtains the first pot detection signal sent by the target pot detection module through the first interface connected to the first target expansion unit. The first pot detection signal is a square wave signal.

[0126] Step S1240: Based on the first pot detection signal, determine whether the first target expansion unit is in normal working condition.

[0127] The operating state of the first target expansion unit is explained below. If the first target expansion unit is in normal operating condition, the control module can successfully control the first target expansion unit to activate the branch between its first common connection terminal and first redundant connection terminal. In this case, the control module can successfully obtain the first boiler detection signal sent by the target boiler detection module from the first interface connected to the first target expansion unit. Conversely, if the first target expansion unit is in abnormal operating condition, the control module may not be able to control the first target expansion unit to activate the branch between its first common connection terminal and first redundant connection terminal. In this case, the control module may not be able to obtain the first boiler detection signal from the first interface, or the first boiler detection signal may be abnormal. It is easy to understand that when the control module determines whether the first target expansion unit is in normal operating condition, it assumes that the switching switches corresponding to the first designated expansion unit and the target boiler detection module are in normal operating condition.

[0128] In some possible embodiments, the control module can determine whether the first target extension unit is in normal working condition based on the signal parameters of the first pot detection signal. Specifically, step S1240 may include steps S1241 and S1242.

[0129] Step S1241: Obtain the first signal frequency of the first boiler detection signal.

[0130] In one implementation, the control module can include a timer. When the first boiler detection signal transitions from low to high for the nth time, the timer records the current time as the first moment; when the first boiler detection signal transitions from low to high for the (n+1)th time, the timer records the current time as the second moment. The control module determines the duration between the second moment and the first moment as the signal period, and then determines the reciprocal of this signal period as the first signal frequency.

[0131] In step S1242, if the first signal frequency falls within a preset frequency range, it is determined that the first target extension unit is in normal working condition.

[0132] In this embodiment, the frequency range represents the range of the first signal frequency when the target detection module and the first target extension unit are normally connected. For example, when researchers perform hardware testing on electrical equipment, they can directly connect the detection module and the resonant module to obtain multiple sets of test data detected by the detection module, and summarize the above-mentioned frequency range based on the multiple sets of test data.

[0133] If the first signal frequency falls within a preset frequency range, the control module determines that the first target expansion unit is in normal working condition. Conversely, if the first signal frequency does not fall within the preset frequency range, the control module determines that the first target expansion unit is in abnormal working condition.

[0134] As one possible implementation, when the control module determines that the first target expansion unit is in an abnormal operating state, it can 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 smartphone) that is communicatively connected to the electrical equipment, to remind the user to repair the electrical equipment and ensure its normal use. For example, the alarm message could read, "Circuit malfunction, please check."

[0135] As another possible implementation, if the control module determines that the first target expansion unit is in an abnormal operating state, it 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 expansion module malfunctioned."

[0136] In other possible embodiments, the control module can also acquire a second boiler detection signal sent by the target boiler detection module through the first interface connected to the first designated expansion unit. By comparing the first boiler detection signal and the second boiler detection signal, it can determine whether the first target expansion unit is in normal working condition. It is easy to understand that since the control module assumes that the switching switches corresponding to the first designated expansion unit and the target boiler detection module are in normal working condition, the second boiler detection signal is a normal boiler detection signal. Therefore, the control module can determine whether the first target expansion unit is in normal working condition by comparing whether the signal parameters of the first boiler detection signal and the second boiler detection signal are consistent. That is, if the signal parameters of the first boiler detection signal and the second boiler detection signal are approximately the same, the control module can determine that the first target expansion unit is in normal working condition. Specifically, the specific implementation method of the control module using two boiler detection signals to determine the working state of the first target expansion unit is described in the following embodiments.

[0137] This embodiment provides a control method for electrical equipment. The control module can detect whether multiple first expansion units are in an abnormal working state through this method. When the first expansion units are in an abnormal working state, the control module can issue an alarm message to remind the user to repair the electrical equipment in time and ensure the normal use of the electrical equipment.

[0138] Please see Figure 13 , Figure 13The illustration schematically depicts a control method for an electrical device according to a second embodiment of this application. Specifically, the method includes the following steps.

[0139] Step S1310: In response to the detection indication, the first target extension unit is determined.

[0140] Specifically, the implementation method of step S1310 can be referred to the relevant introduction of step S1210, and will not be repeated here.

[0141] Step S1320: Control the branch connection between the first target expansion unit and the target inspection module.

[0142] In this embodiment, step S1320 may include steps S1321 to S1323.

[0143] Step S1321: Control the first target extension unit to connect the branch between its first common connection terminal and first redundant connection terminal.

[0144] In this embodiment, the control module can send a first designated control signal to the first control terminal of the first target extension unit. The first designated control signal is used to instruct the first target extension unit to connect the branch between its first common connection terminal and first redundant connection terminal.

[0145] Step S1322: Control the first designated expansion unit to connect the branch between its first common connection terminal and the first target connection terminal among a plurality of first connection terminals.

[0146] In this embodiment, the first target connection terminal is connected to the target pot detection module. The control module can first determine the first target connection terminal to which the target pot detection module is connected, and then send a second designated control signal to the first control terminal of the first designated extension unit. The second designated control signal is used to instruct the first designated extension unit to conduct the branch between its first common connection terminal and the first target connection terminal.

[0147] Step S1323: Control the switching switch corresponding to the target pot detection module to turn on the branch between the first common terminal and the first position terminal.

[0148] In this embodiment, the control module can send a switching control signal to the switching switch corresponding to the target pot detection module. The switching control signal is used to instruct the switching switch to turn on the branch between the first common terminal and the first position terminal.

[0149] It should be noted that steps S1321 to S1323 are not executed in any particular order. That is, steps S1321 to S1323 can be executed by the control module simultaneously or sequentially.

[0150] Step S1330: Obtain the first pot detection signal sent by the target pot detection module through the first interface connected to the first target expansion unit.

[0151] Step S1340: Based on the first pot detection signal, determine whether the first target expansion unit is in normal working condition.

[0152] In this embodiment, the control module compares two detection signals to determine whether the first target expansion unit is in normal working condition. Specifically, step S1340 may include steps S1341 to S1343.

[0153] Step S1341: Obtain the second pot detection signal sent by the target pot detection module through the first interface connected to the first designated expansion unit.

[0154] In this embodiment, steps S1330 and S1341 are not executed in any particular order. That is, steps S1330 and S1341 can be executed by the control module simultaneously or sequentially.

[0155] Step S1342: Obtain the first signal frequency of the first pot detection signal and the second signal frequency of the second pot detection signal.

[0156] In one implementation, the control module can include a timer. When the second boiler detection signal transitions from low to high for the nth time, the timer records the current time as the third moment; when the second boiler detection signal transitions from low to high for the (n+1)th time, the timer records the current time as the fourth moment. The control module determines the duration between the fourth and third moments as the signal period, and then determines the reciprocal of this signal period as the second signal frequency.

[0157] The method for obtaining the first signal frequency of the first boiler inspection signal can be found in the relevant description in step S1241, and will not be repeated here.

[0158] In step S1343, if the absolute value of the difference between the first signal frequency and the second signal frequency is less than or equal to the first specified difference, then it is determined that the first target expansion unit is in normal working condition.

[0159] In this embodiment, the first specified difference can be a preset value in the control module, or it can be adjusted by the R&D personnel based on the specific operating conditions of the electrical equipment. Specifically, the first specified difference can be greater than or equal to 0Hz and less than or equal to 15Hz; for example, the first specified difference can be 5Hz, 10Hz, etc. If the absolute value of the difference between the first signal frequency and the second signal frequency is less than or equal to the first specified difference, the control module indicates that the first pot detection signal and the second pot detection signal are approximately the same, and thus determines that the first target expansion unit is in a normal operating state. Conversely, if the absolute value of the difference between the first signal frequency and the second signal frequency is greater than the first specified difference, the control module determines that the first target expansion unit is in an abnormal operating state.

[0160] This embodiment provides a control method for electrical equipment. In this method, the control module only needs to compare whether the signal parameters of two boiler detection signals are approximately the same to determine whether the first target extension unit is in normal working condition. Compared with the technical solution of determining the working state of the first target extension unit by only using the signal parameters of one boiler detection signal, developers do not need to pre-test and store the normal parameter range of the signal parameters, thereby saving the testing cost of electrical equipment.

[0161] Please see Figure 14 , Figure 14 The diagram schematically illustrates a control method for an electrical device according to a third embodiment of this application. This method describes how the control module detects whether a second expansion unit is faulty. Specifically, the method includes the following steps.

[0162] Step S1410: Determine the second target expansion unit.

[0163] In this embodiment, the second target expansion unit is the second expansion unit to be detected. As one implementation, the control module can sequentially perform fault detection on multiple second expansion units and determine the currently detected second expansion unit as the second target expansion unit.

[0164] In this embodiment, in response to a detection instruction, the control module can first perform fault detection on multiple first expansion units sequentially, and then perform fault detection on multiple second expansion units sequentially. Alternatively, it can first perform fault detection on multiple second expansion units sequentially, and then perform fault detection on multiple first expansion units sequentially. This embodiment does not specifically limit the order of detection for the first and second expansion units.

[0165] Step S1420: Control the branch connection between the second target expansion unit and the target current detection module.

[0166] In this embodiment, the target current detection module is connected to the second designated expansion unit connected to the second redundant connection terminal of the second target expansion unit. Please refer again. Figure 9 Taking the second target extension unit as the second extension unit 541a as an example, the second designated extension unit is the second extension unit 541b. The target current detection module can be any one of the multiple current detection modules connected to the second extension unit 541b.

[0167] Therefore, when the control module controls the branch connection between the second target expansion unit and the target current detection module, it needs to control the branch connection between the second common connection terminal and the second redundant connection terminal included in the second expansion unit 541a, and control the branch connection between the second common connection terminal included in the second expansion unit 541b and the target current detection module.

[0168] Step S1430: Obtain the first current detection signal sent by the target current detection module through the second interface connected to the second target expansion unit.

[0169] In this embodiment, the control module obtains the first current detection signal sent by the target current detection module through the second interface connected to the second target expansion unit. The first current detection signal has a waveform as shown below. Figure 5 As shown in part (d) of the document.

[0170] Step S1440: Based on the first current detection signal, determine whether the second target expansion unit is in normal working condition.

[0171] As described in the hardware embodiments above, the hardware structure of the multiple second expansion units is the same as that of the multiple first expansion units. Therefore, the description of the working state of the second target expansion unit can be found in the description of "working state of the first target expansion unit" in step S1240, and will not be repeated here. Similarly, when the control module determines whether the second target expansion unit is in a normal working state, it assumes that the second designated expansion unit is in a normal working state.

[0172] In some possible embodiments, the control module can also acquire a second current detection signal sent by the target current detection module through the second interface connected to the second designated expansion unit, and determine whether the second target expansion unit is in normal working condition by comparing the first current detection signal and the second current detection signal. It is easy to understand that since the second designated expansion unit is in normal working condition, the second current detection signal is a normal current detection signal. Therefore, the control module can determine whether the second target expansion unit is in normal working condition by comparing whether the signal parameters of the first current detection signal and the second current detection signal are consistent. That is, if the signal parameters of the first current detection signal and the second current detection signal are approximately the same, the control module can determine that the second target expansion unit is in normal working condition. Specifically, step S1440 may include steps S1441 and S1443.

[0173] Step S1441: Obtain the second current detection signal sent by the target current detection module through the second interface connected to the second designated expansion unit.

[0174] In this embodiment, steps S1430 and S1441 are not executed in any particular order. That is, steps S1430 and S1441 can be executed by the control module simultaneously or sequentially.

[0175] Step S1443: Based on the first current detection signal and the second current detection signal, determine whether the second target expansion unit is in normal working condition.

[0176] In this embodiment, the control module can determine whether the second target extension unit is in normal working condition by comparing the signal parameters of the first current detection signal and the second current detection signal. Specifically, if the signal parameters of the first current detection signal and the second current detection signal are consistent, the control module can determine that the second target extension unit is in normal working condition; conversely, if the signal parameters of the first current detection signal and the second current detection signal are inconsistent, the control module can determine that the second target extension unit is in abnormal working condition.

[0177] In one implementation, the signal parameters may include the AD sampling value of the signal, and step S1443 may include steps S1445 and S1446.

[0178] Step S1445: Obtain the first sample value of the first current detection signal and the second sample value of the second current detection signal.

[0179] In one implementation, the control module may have a built-in AD sampling module, one end of which is connected to the second port for AD sampling of the signal input to the second port. Therefore, the control module can obtain the first sampled value of the first current detection signal and the second sampled value of the second current detection signal through the AD sampling module.

[0180] Step S1446: If the absolute value of the difference between the first sampled value and the second sampled value is less than or equal to the second specified difference, then the second target extension unit is determined to be in normal working condition.

[0181] In this embodiment, the second specified difference can be a preset value in the control module, or it can be adjusted by the R&D personnel based on the specific operating conditions of the electrical equipment. Specifically, the second specified difference can be greater than or equal to 0V and less than or equal to 1V; for example, the second specified difference can be 0.1V, 0.5V, etc. If the absolute value of the difference between the first sample value and the second sample value is less than or equal to the second specified difference, the control module indicates that the first current detection signal and the second current detection signal are approximately the same, and thus determines that the second target expansion unit is in a normal operating state. Conversely, if the absolute value of the difference between the first sample value and the second sample value is greater than the second specified difference, the control module determines that the second target expansion unit is in an abnormal operating state.

[0182] As one possible implementation, the control module can generate alarm information or fault record when it determines that the second target expansion unit is in an abnormal operating state. Specifically, the relevant description of the control module generating alarm information and / or fault record can be found in step S1242, and will not be repeated here.

[0183] In another implementation, the signal parameters may include the signal frequency, and step S1443 may include steps S1447 and S1448.

[0184] Step S1447: Obtain the third signal frequency of the first current detection signal and the fourth signal frequency of the second current detection signal.

[0185] In this embodiment, please refer again. Figure 9 The control module can have a built-in comparator that converts the current detection signal into a PWM signal (i.e., a square wave signal). Since the PWM signal frequency is the same as the current detection signal frequency, the control module can determine the current detection signal frequency by obtaining the PWM signal frequency.

[0186] Specifically, the method for obtaining the third signal frequency of the first current detection signal and the method for obtaining the fourth signal frequency of the second current detection signal can be referred to the relevant introduction of obtaining the first signal frequency of the first detection signal in step S1241, and will not be repeated here.

[0187] In step S1448, if the absolute value of the difference between the third signal frequency and the fourth signal frequency is less than or equal to the third specified difference, then it is determined that the second target expansion unit is in normal working condition.

[0188] In this embodiment, the third specified difference can be a preset value in the control module, or it can be adjusted by the R&D personnel based on the specific operating conditions of the electrical equipment. Specifically, the third specified difference can be greater than or equal to 0Hz and less than or equal to 15Hz; for example, the third specified difference can be 5Hz, 10Hz, etc. If the absolute value of the difference between the third signal frequency and the fourth signal frequency is less than or equal to the third specified difference, the control module indicates that the first current detection signal and the second current detection signal are approximately the same, and thus determines that the second target expansion unit is in a normal operating state. Conversely, if the absolute value of the difference between the third signal frequency and the fourth signal frequency is greater than the third specified difference, the control module determines that the second target expansion unit is in an abnormal operating state.

[0189] In other possible embodiments, the control module may also determine whether the second target extension unit is in normal working condition based on the signal parameters of the first current detection signal. Here, we will use signal frequency as an example for explanation. Please refer again. Figure 5 When the second target expansion unit is in normal operating condition, the signal frequency of the first current detection signal and the signal frequency of the drive pulse signal are the same. Therefore, the control module can determine whether the second target expansion unit is in normal operating condition by comparing the magnitudes of the two signal frequencies. Specifically, step S1440 may include steps A100 to A300.

[0190] Step A100: Obtain the pulse signal frequency of the driving pulse signal.

[0191] In this embodiment, since the driving pulse signal is a control signal generated internally by the control module, the control module can determine the pulse signal frequency of the driving pulse signal by obtaining the signal parameters of the driving pulse signal.

[0192] Step A200: Obtain the third signal frequency of the first current detection signal.

[0193] Specifically, the implementation method of step A200 can be found in the relevant description in step S1447, and will not be repeated here.

[0194] In step A300, if the absolute value of the difference between the third signal frequency and the pulse signal frequency is less than or equal to the specified frequency difference, then the second target expansion unit is determined to be in normal working condition.

[0195] In this embodiment, the specified frequency difference can be a preset value in the control module, or it can be adjusted by the R&D personnel based on the specific operating conditions of the electrical equipment. Specifically, the specified frequency difference can be greater than or equal to 0Hz and less than or equal to 15Hz; for example, the specified frequency difference can be 5Hz, 10Hz, etc. If the absolute value of the difference between the third signal frequency and the pulse signal frequency is less than or equal to the specified frequency difference, the control module determines that the second target expansion unit is in a normal operating state. Conversely, if the absolute value of the difference between the third signal frequency and the pulse signal frequency is greater than the specified frequency difference, the control module determines that the second target expansion unit is in an abnormal operating state.

[0196] This embodiment provides a control method for electrical equipment. The control module can detect whether multiple second expansion units are in an abnormal working state through this method. When the second expansion units are in an abnormal working state, the control module can issue an alarm message to remind the user to repair the electrical equipment in time and ensure the normal use of the electrical equipment.

[0197] Please see Figure 15 , Figure 15 The illustration schematically depicts a control method for an electrical device provided in the fourth embodiment of this application. This method describes how the control module detects whether a third expansion unit is faulty. Specifically, the method includes the following steps.

[0198] Step S1510: Determine the third target expansion unit.

[0199] In this embodiment, the third target extension unit is the third extension unit to be detected. As one implementation, the control module can sequentially perform fault detection on multiple third extension units and determine the currently detected third extension unit as the third target extension unit.

[0200] In this embodiment, in response to a detection instruction, the control module can first perform fault detection on multiple first expansion units sequentially, and then perform fault detection on multiple third expansion units sequentially. Alternatively, it can first perform fault detection on multiple third expansion units sequentially, and then perform fault detection on multiple first expansion units sequentially. This embodiment does not specify a particular order for detecting the first and third expansion units.

[0201] Step S1520: Control the branch connection between the third target expansion unit and the target temperature detection module.

[0202] In this embodiment, the target temperature detection module is connected to the third designated expansion unit connected to the third redundant connection terminal of the third target expansion unit. Please refer again. Figure 11 Taking the third target extension unit as the third extension unit 561a as an example, the third designated extension unit is the third extension unit 561b. The target temperature detection module can be any one of the multiple temperature detection modules connected to the third extension unit 561b.

[0203] Therefore, when the control module controls the branch connection between the third target expansion unit and the target temperature detection module, it needs to control the branch connection between the third common connection terminal and the third redundant connection terminal included in the third expansion unit 561a, and control the branch connection between the third common connection terminal included in the third expansion unit 561b and the target temperature detection module.

[0204] Step S1530: Obtain the first temperature detection signal sent by the target temperature detection module through the third interface connected to the third target expansion unit.

[0205] Step S1540: Based on the first temperature detection signal, determine whether the third target expansion unit is in normal working condition.

[0206] As described in the hardware embodiments above, the hardware structure of the multiple third expansion units is the same as that of the multiple first expansion units. Therefore, the description of the working state of the third target expansion unit can be found in the description of "working state of the first target expansion unit" in step S1240, and will not be repeated here. Similarly, when the control module determines whether the third target expansion unit is in a normal working state, it assumes that the third designated expansion unit is in a normal working state.

[0207] In some possible embodiments, the control module can also acquire the second temperature detection signal sent by the target temperature detection module through the third interface connected to the third designated expansion unit, and determine whether the third target expansion unit is in normal working condition by comparing the first temperature detection signal and the second temperature detection signal. It is easy to understand that since the third designated expansion unit is in normal working condition, the second temperature detection signal is a normal temperature detection signal. Therefore, the control module can determine whether the third target expansion unit is in normal working condition by comparing whether the signal parameters of the first temperature detection signal and the second temperature detection signal are consistent. That is, if the signal parameters of the first temperature detection signal and the second temperature detection signal are approximately the same, the control module can determine that the third target expansion unit is in normal working condition. Specifically, step S1540 may include steps S1541 to S1543.

[0208] Step S1541: Obtain the second temperature detection signal sent by the target temperature detection module through the third interface connected to the third designated expansion unit.

[0209] In this embodiment, steps S1530 and S1541 are not executed in any particular order. That is, steps S1530 and S1541 can be executed by the control module simultaneously or sequentially.

[0210] Step S1542: Obtain the third sample value of the first temperature detection signal and the fourth sample value of the second temperature detection signal.

[0211] In one implementation, the control module may have a built-in AD sampling module, one end of which is connected to a third port for AD sampling of the signal input at the third port. Therefore, the control module can obtain the third sample value of the first temperature detection signal and the fourth sample value of the second temperature detection signal through the AD sampling module.

[0212] In step S1543, if the absolute value of the difference between the third sample value and the fourth sample value is less than or equal to the fourth specified difference, then it is determined that the third target expansion unit is in normal working condition.

[0213] In this embodiment, the fourth specified difference value can be a preset value in the control module, or it can be adjusted by the R&D personnel based on the specific operating conditions of the electrical equipment. Specifically, the fourth specified difference value can be greater than or equal to 0V and less than or equal to 1V. For example, the fourth specified difference value can be 0.1V, 0.5V, etc. If the absolute value of the difference between the third sample value and the fourth sample value is less than or equal to the fourth specified difference value, the control module indicates that the first temperature detection signal and the second temperature detection signal are approximately the same, and thus determines that the third target expansion unit is in a normal operating state. Conversely, if the absolute value of the difference between the third sample value and the fourth sample value is greater than the fourth specified difference value, the control module determines that the third target expansion unit is in an abnormal operating state.

[0214] As one possible implementation, the control module can generate alarm information or fault records when it determines that the third target expansion unit is in an abnormal operating state. Specifically, the relevant description of the control module generating alarm information and / or fault records can be found in step S1242, and will not be repeated here.

[0215] In other possible embodiments, the control module may also determine whether the third target extension unit is in normal working condition based on the signal parameters of the first temperature detection signal. Here, we will use the AD sampling value of the signal as an example. Specifically, step S1540 may include steps B100 to B200.

[0216] Step B100: Obtain the third sampled value of the first temperature detection signal.

[0217] Specifically, the implementation method of step B100 can be referred to the relevant description in step S1542, and will not be repeated here.

[0218] In step B200, if the third sampled value falls within a pre-set sampling interval, then the third target extension unit is determined to be in normal working condition.

[0219] In this embodiment, the sampling interval represents the range of the third sampled value under normal conduction conditions between the target temperature detection module and the third target extension unit. For example, when researchers perform hardware testing on electrical equipment, they can acquire multiple sets of test data detected by the temperature sampling module and summarize the above-mentioned sampling interval based on these multiple sets of test data.

[0220] If the third sampled value falls within a pre-set sampling range, the control module determines that the third target expansion unit is in normal working condition. Conversely, if the third sampled value does not fall within the pre-set sampling range, the control module determines that the third target expansion unit is in abnormal working condition.

[0221] This embodiment provides a control method for electrical equipment. The control module can detect whether multiple third expansion units are in an abnormal working state through this method. When a third expansion unit is in an abnormal working state, the control module can issue an alarm message to remind the user to repair the electrical equipment in time and ensure the normal use of the electrical equipment.

[0222] Please see Figure 16 , Figure 16 The illustration schematically depicts a control device 1600 for an electrical appliance according to an embodiment of this application. The device 1600 may include a first determining unit 1610, a first controlling unit 1620, a first acquiring unit 1630, and a first judging unit 1640. The first determining unit 1610 is used to determine a first target extension unit in response to a detection indication; the first target extension unit is a first extension unit to be detected. The first controlling unit 1620 is used to control the branch connection between the first target extension unit and a target pot detection module; the target pot detection module is connected to a first designated extension unit connected to a first redundant connection terminal of the first target extension unit. The first acquiring unit 1630 is used to acquire a first pot detection signal sent by the target pot detection module through a first interface connected to the first target extension unit. The first judging unit 1640 is used to determine whether the first target extension unit is in a normal operating state based on the first pot detection signal.

[0223] In some possible embodiments, the first determination unit 1640 is specifically used to obtain the second pot detection signal sent by the target pot detection module through the first interface connected to the first designated expansion unit; obtain the first signal frequency of the first pot detection signal and the second signal frequency of the second pot detection signal; and determine that the first target expansion unit is in normal working state if the absolute value of the difference between the first signal frequency and the second signal frequency is less than or equal to the first designated difference.

[0224] In some possible embodiments, the first determination unit 1640 is specifically used to obtain the first signal frequency of the first detection signal; if the first signal frequency belongs to a preset frequency range, then it is determined that the first target extension unit is in normal working condition.

[0225] In some possible embodiments, the first control unit 1620 is specifically used to control the first target extension unit to conduct the branch between its first common connection terminal and the first redundant connection terminal; control the first designated extension unit to conduct the branch between its first common connection terminal and the first target connection terminal among a plurality of first connection terminals, the first target connection terminal being connected to the target pot detection module; and control the switching switch corresponding to the target pot detection module to conduct the branch between the first common terminal and the first position terminal.

[0226] In some possible embodiments, the device 1600 may further include a second determining unit (not shown in the figure), a second controlling unit (not shown in the figure), a second acquiring unit (not shown in the figure), and a second judging unit (not shown in the figure). The second determining unit is used to determine a second target extension unit, which is a second extension unit to be detected. The second controlling unit is used to control the branch connection between the second target extension unit and the target current detection module; the target current detection module is connected to a second designated extension unit connected to the second redundant connection terminal of the second target extension unit. The second acquiring unit is used to acquire a first current detection signal sent by the target current detection module through a second interface connected to the second target extension unit. The second judging unit is used to determine whether the second target extension unit is in a normal operating state based on the first current detection signal.

[0227] In some possible embodiments, the second determination unit is specifically used to obtain the second current detection signal sent by the target current detection module through the second interface connected to the second designated expansion unit; and to determine whether the second target expansion unit is in normal working condition based on the first current detection signal and the second current detection signal.

[0228] In some possible embodiments, the second determination unit is specifically used to acquire a first sample value of the first current detection signal and a second sample value of the second current detection signal; if the absolute value of the difference between the first sample value and the second sample value is less than or equal to a second specified difference, then it is determined that the second target extension unit is in normal working condition.

[0229] In some possible embodiments, the second determination unit is specifically used to obtain the third signal frequency of the first current detection signal and the fourth signal frequency of the second current detection signal; if the absolute value of the difference between the third signal frequency and the fourth signal frequency is less than or equal to a third specified difference, then it is determined that the second target extension unit is in normal working condition.

[0230] In some possible embodiments, the device 1600 may further include a third determining unit (not shown in the figure), a third controlling unit (not shown in the figure), a third acquiring unit (not shown in the figure), and a third judging unit (not shown in the figure). The third determining unit is used to determine a third target extension unit, which is a third extension unit to be detected. The third controlling unit is used to control the branch connection between the third target extension unit and the target temperature detection module; the target temperature detection module is connected to a third designated extension unit connected to the third redundant connection terminal of the third target extension unit. The third acquiring unit is used to acquire a first temperature detection signal sent by the target temperature detection module through a third interface connected to the third target extension unit. The third judging unit is used to determine whether the third target extension unit is in a normal operating state based on the first temperature detection signal.

[0231] In some possible embodiments, the third determination unit is specifically used to obtain the second temperature detection signal sent by the target temperature detection module through the third interface connected to the third designated extension unit; obtain the third sample value of the first temperature detection signal and the fourth sample value of the second temperature detection signal; and determine that the third target extension unit is in normal working condition if the absolute value of the difference between the third sample value and the fourth sample value is less than or equal to the fourth designated difference.

[0232] 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.

[0233] In the several embodiments provided in this application, the coupling between modules can be electrical, mechanical, or other forms of coupling.

[0234] 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.

[0235] This embodiment provides a control device for electrical equipment. The control module can detect whether multiple first expansion units are in an abnormal working state through this device. If the first expansion unit is in an abnormal working state, the control module can issue an alarm message to remind the user to repair the electrical equipment in time and ensure the normal use of the electrical equipment.

[0236] Please see Figure 17 , Figure 17 The illustration shows that an embodiment of this application also provides an electrical device 1700, which includes the electromagnetic heating circuit 1710 described above. The specific implementation of the electromagnetic heating circuit 1710 can be referred to the relevant description in the application environment embodiment above, and will not be repeated here.

[0237] The control module in the electromagnetic heating circuit 1710 may include one or more processors 1711, a memory 1712, and one or more application programs. The one or more application programs are stored in the memory 1712 and configured to be executed by the one or more processors 1711, and are configured to perform the methods described in the above embodiments.

[0238] The processor 1711 may include one or more processing cores. The processor 1711 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 1712, and by calling data stored in memory 1712. Optionally, the processor 1711 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 1711 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 1711 and may be implemented separately through a communication chip.

[0239] The memory 1712 may include random access memory (RAM) or read-only memory (ROM). The memory 1712 can be used to store instructions, programs, code, code sets, or instruction sets. The memory 1712 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.).

[0240] Please see Figure 18 , Figure 18 The present application also schematically illustrates a computer-readable storage medium 1800, which stores computer program instructions 1810 that can be invoked by a processor to perform the methods described in the above embodiments.

[0241] The computer-readable storage medium 1800 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 non-transitory computer-readable storage medium. The computer-readable storage medium 1800 has storage space for computer program instructions 1810 that perform any of the method steps described above. These computer program instructions 1810 may be read from or written to one or more computer program products.

[0242] 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 by, The electromagnetic heating circuit comprises: N resonance modules, N being an integer greater than 1; an inverter module; N detection modules corresponding to the N resonance modules respectively, the detection modules being used to detect whether the resonance modules are covered by a pot; N switching-on and switching-off switches corresponding to the N resonance modules respectively, the switching-on and switching-off switches being provided with a first common terminal, a first movable terminal, a first position terminal and a second position terminal, the first movable terminal being connected to the first common terminal, the first common terminal being connected to the resonance module, the first position terminal being connected to the detection module, and the second position terminal being connected to the inverter module; a first expansion module comprising a plurality of first expansion units, each of the first expansion units comprising a first common connection terminal, a first redundant connection terminal and a plurality of first connection terminals, the total number of the first connection terminals comprised by the plurality of first expansion units being greater than or equal to N, any N first connection terminals in the plurality of first expansion units being connected to N detection modules one by one, and each first redundant connection terminal being connected to the first common connection terminal of a corresponding first designated expansion unit in the plurality of first expansion units, the first designated expansion unit and the first expansion unit in which the first redundant connection terminal is located being different; a control module being electrically connected to the inverter module and the N switching-on and switching-off switches respectively, the control module comprising a plurality of first interfaces, the plurality of first interfaces being connected to the first common connection terminals of the plurality of first expansion units one by one. The electromagnetic heating circuit further comprises N current detection modules corresponding to the N resonance modules respectively, the current detection modules being connected between the first common terminals of the switching-on and switching-off switches and the resonance modules, and being used to detect the current change of the branch in which the current detection module is located; 2. The electromagnetic heating circuit of claim 1, wherein, The electromagnetic heating circuit further comprises a second expansion module, the second expansion module comprising a plurality of second expansion units, each of the second expansion units comprising a second common connection terminal, a second redundant connection terminal and a plurality of second connection terminals, the total number of the second connection terminals comprised by the plurality of second expansion units being greater than or equal to N, any N second connection terminals in the plurality of second expansion units being connected to N current detection modules one by one, and the second redundant connection terminal being connected to the second common connection terminal of a second designated expansion unit in the plurality of second expansion units; The control module further comprises a plurality of second interfaces, the plurality of second interfaces being connected to the second common connection terminals of the plurality of second expansion units one by one. The current detection module comprises a current detection unit and a voltage conversion unit; 3. The electromagnetic heating circuit of claim 2, wherein, The input terminal of the current detection unit is connected between the first common terminals of the switching-on and switching-off switches and the resonance modules, and is used to obtain a current signal of the branch in which the current detection unit is located; The voltage conversion unit is connected between the output terminal of the current detection unit and the second connection terminal, and is used to convert the current signal into a current detection signal. The output terminal of the current detection unit comprises a first output terminal and a second output terminal, and the second output terminal is grounded.

4. The electromagnetic heating circuit of claim 3, wherein, ​ The voltage conversion unit comprises a diode, a first resistor and a second resistor; the first resistor is connected between the first output end and the second output end; a positive electrode of the diode is connected to the first output end, and a negative electrode of the diode is connected to the second connection end; one end of the second resistor is connected to the negative electrode of the diode, and the other end is connected to the second output end.

5. The electromagnetic heating circuit of claim 1, wherein, The electromagnetic heating circuit further comprises N temperature detection modules corresponding to the N resonance modules one by one, and the temperature detection modules are used to acquire temperature information of the resonance modules; The electromagnetic heating circuit further comprises a third expansion module, the third expansion module comprises a plurality of third expansion units, and the third expansion unit comprises a third common connection end, a third redundant connection end and a plurality of third connection ends; the total number of the third connection ends comprised by the plurality of third expansion units is greater than or equal to the N, and any N third connection ends in the plurality of third expansion units are connected to N temperature detection modules one by one; the third redundant connection end is connected to the third common connection end of a third specified expansion unit in the plurality of third expansion units; The control module further comprises a plurality of third interfaces, and the plurality of third interfaces are connected to the third common connection ends of the plurality of third expansion units one by one.

6. A control method of an electric appliance device, characterized by, The electrical equipment comprises the electromagnetic heating circuit according to any one of claims 1 to 5, and the method comprises: in response to the detection instruction, determining a first target expansion unit, the first target expansion unit being a first expansion unit to be detected; controlling the branch between the first target expansion unit and a target detection module to be conducted; the target detection module is connected to a first specified expansion unit connected to the first redundant connection end of the first target expansion unit; acquiring a first detection signal sent by the target detection module through a first interface connected to the first target expansion unit; based on the first detection signal, determining whether the first target expansion unit is in a normal working state.

7. The method of claim 6, wherein, The determination whether the first target expansion unit is in the normal working state based on the first detection signal comprises: acquiring a second detection signal sent by the target detection module through a first interface connected to the first specified expansion unit; acquiring a first signal frequency of the first detection signal and a second signal frequency of the second detection signal; in a case where an absolute value of a difference between the first signal frequency and the second signal frequency is less than or equal to a first specified difference, it is determined that the first target expansion unit is in the normal working state.

8. The method of claim 6, wherein, The determination whether the first target expansion unit is in the normal working state based on the first detection signal comprises: acquiring a first signal frequency of the first detection signal; in a case where the first signal frequency belongs to a pre-set frequency interval, it is determined that the first target expansion unit is in the normal working state.

9. The method of claim 6, wherein, The control of the branch between the first target expansion unit and the target detection module to be conducted comprises: controlling the first target expansion unit to conduct a branch between the first common connection end and the first redundant connection end comprised by the first target expansion unit; Controlling the first designated extension unit to turn on a branch between the first common connection end and a first target connection end of the plurality of first connection ends included in the first designated extension unit, the first target connection end being connected to the target current detection module; Controlling the target current detection module to turn on a branch between the first common connection end and the first target connection end of the plurality of first connection ends included in the first designated extension unit.

10. The method of claim 6, wherein, The electrical appliance device comprises the electromagnetic heating circuit according to any one of claims 2 to 4, and the method further comprises: Determining a second target extension unit, the second target extension unit being a second extension unit to be detected; Controlling a branch between the second target extension unit and a target current detection module to be turned on, the target current detection module being connected to a second designated extension unit to which a second redundant connection end of the second target extension unit is connected; Obtaining a first current detection signal sent by the target current detection module through a second interface to which the second target extension unit is connected; Based on the first current detection signal, determining whether the second target extension unit is in a normal working state.

11. The method of claim 10, wherein, The method further comprises: Obtaining a second current detection signal sent by the target current detection module through a second interface to which the second designated extension unit is connected; Based on the first current detection signal and the second current detection signal, determining whether the second target extension unit is in a normal working state.

12. The method of claim 11, wherein, The method further comprises: Obtaining a first sampling value of the first current detection signal and a second sampling value of the second current detection signal; in a case where an absolute value of a difference between the first sampling value and the second sampling value is less than or equal to a second specified difference value, it is determined that the second target extension unit is in a normal working state; or Obtaining a third signal frequency of the first current detection signal and a fourth signal frequency of the second current detection signal; in a case where an absolute value of a difference between the third signal frequency and the fourth signal frequency is less than or equal to a third specified difference value, it is determined that the second target extension unit is in a normal working state.

13. The method of claim 6, wherein, The electrical appliance device comprises the electromagnetic heating circuit according to claim 5, and the method further comprises: Determining a third target extension unit, the third target extension unit being a third extension unit to be detected; Controlling a branch between the third target extension unit and a target temperature detection module to be turned on, the target temperature detection module being connected to a third designated extension unit to which a third redundant connection end of the third target extension unit is connected; Obtaining a first temperature detection signal sent by the target temperature detection module through a third interface to which the third target extension unit is connected; Based on the first temperature detection signal, determining whether the third target extension unit is in a normal working state.

14. The method of claim 13, wherein, The method further comprises: Obtaining a second temperature detection signal sent by the target temperature detection module through a third interface to which the third designated extension unit is connected; acquire the second temperature detection signal sent by the target temperature detection module through a third interface connected with the third designated extension unit; acquire a third sampling value of the first temperature detection signal and a fourth sampling value of the second temperature detection signal; in a case where an absolute value of a difference between the third sampling value and the fourth sampling value is less than or equal to a fourth specified difference value, it is determined that the third target extension unit is in a normal working state.

15. A control device for an electric appliance, characterized by The electrical appliance device comprises the electromagnetic heating circuit according to any one of claims 1 to 5, and the apparatus comprises: a first determination unit configured to determine a first target extension unit in response to a detection instruction, the first target extension unit being a first extension unit to be detected; a first control unit configured to control a branch between the first target extension unit and a target detection pot module to be conductive, the target detection pot module being connected with a first designated extension unit connected with a first redundancy connection end of the first target extension unit; a first acquisition unit configured to acquire a first detection pot signal sent by the target detection pot module through a first interface connected with the first target extension unit; a first judgment unit configured to judge whether the first target extension unit is in a normal working state based on the first detection pot signal.

16. An electrical appliance characterized by The electrical appliance device comprises the electromagnetic heating circuit according to any one of claims 1 to 5, and a control module in the electromagnetic heating circuit comprises: one or more processors; a memory; and one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the one or more processors, and configured to execute the method according to any one of claims 6 to 14.

17. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer program instructions, and the computer program instructions can be invoked and executed by a processor to execute the method according to any one of claims 6 to 14. The computer readable storage medium stores computer program instructions, and the computer program instructions can be invoked and executed by a processor to execute the method according to any one of claims 6 to 14.

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