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

Abstract

The invention discloses an electromagnetic heating circuit, a control method and device of electrical equipment and the electrical equipment. The electromagnetic heating circuit comprises N resonance modules, an inversion module, N pot detection modules in one-to-one correspondence with the N resonance modules, N fling-cut switches in one-to-one correspondence with the N resonance modules, a first expansion module and a control module. The first expansion module can comprise a plurality of first expansion units, any N first connection ends in the plurality of first expansion units are connected to the N pot detection modules in a one-to-one correspondence manner, and the first common connection end is connected to the first interface of the control module; therefore, the control module can receive N paths of pot detection signals output by the N pot detection modules through the plurality of first interfaces, and the number of the first interfaces is far smaller than that of the pot detection modules. Therefore, according to the electromagnetic heating circuit, input expansion of the control module can be realized by arranging the first expansion module, so that interface resources of the control module are saved, and the model selection difficulty of a chip is reduced.

Description

Technical Field

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

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

[0003] In order to accurately control multiple coil disks, multiple signals need to be collected in the full-area multi-burner stove, such as the temperature signal and current signal of the coil disk. The control chip inside the full-area multi-burner stove completes the heating task of the pot by processing the above multiple signals.

[0004] However, the signal ports of the control chip are limited, which makes it difficult for the control chip to process multiple signals, increasing the difficulty of chip selection. Summary of the invention

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

[0006] In the first aspect, some embodiments of the present application provide an electromagnetic heating circuit, which includes N resonance modules, an inverter module, N pot detection modules corresponding to the N resonance modules, N switching switches corresponding to the N resonance 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 resonance module is covered by the pot. The switching switch is provided with a first common terminal, a first active terminal, a first position terminal and a second position terminal, the first active terminal and the first common terminal are connected; the first common terminal is connected to the resonance module, the first position terminal is connected to the pot detection module; the second position terminal is connected to the inverter module. The first expansion module includes a plurality of first expansion units, the first expansion unit includes a first common connection terminal, a first redundant connection terminal and a plurality of first connection terminals; the total number of first connection terminals included in the plurality of first expansion units is greater than or equal to N, and any N first connection terminals in the plurality of first expansion units are connected to the N pot detection modules in a one-to-one correspondence; the first redundant connection terminal is connected to the first common connection terminal of the first designated expansion unit in the plurality of first expansion units. The control module is electrically connected to the inverter module and the N switching switches respectively; the control module comprises a plurality of first interfaces, and the plurality of first interfaces are connected to the first common connection terminals of the plurality of first expansion units in a one-to-one correspondence.

[0007] In a second aspect, some embodiments of the present application also provide a control method for an electrical device, which includes the above-mentioned electromagnetic heating circuit, the method including: in response to a detection indication, determining a first target expansion unit, the first target expansion unit being the first expansion unit to be detected; controlling the conduction of a branch between the first target expansion unit and the target pot detection module; connecting the target pot detection module to a first designated expansion unit connected to a first redundant connection end of the first target expansion unit; acquiring a first pot detection signal sent by the target pot detection module through a first interface connected to the first target expansion unit; and judging whether the first target expansion unit is in a normal working state based on the first pot detection signal.

[0008] In a third aspect, some embodiments of the present application also provide a control device for an electrical device, the electrical device includes the above-mentioned electromagnetic heating circuit, and the device includes a first determination unit, a first control unit, a first acquisition unit and a first judgment unit. Among them, the first determination unit is used to determine the first target expansion unit in response to the detection indication, and the first target expansion unit is the first expansion unit to be detected. The first control unit is used to control the branch conduction between the first target expansion unit and the target pot detection module; the target pot detection module is connected to the first designated expansion unit connected to the first redundant connection end of the first target expansion unit. The first acquisition unit is used to obtain 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 judgment unit is used to determine whether the first target expansion unit is in a normal working state based on the first pot detection signal.

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

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

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

[0012] The present application provides an electromagnetic heating circuit, a control method for electrical equipment, a device and an electrical equipment. The electromagnetic heating circuit includes N resonance modules, an inverter module, N pot detection modules corresponding to the N resonance modules, N switching switches corresponding to the N resonance modules, a first expansion module and a control module. Among them, the first expansion module may include multiple first expansion units, and the first expansion unit includes a first common connection terminal, a first redundant connection terminal and multiple first connection terminals. Among them, any N first connection terminals of the multiple first expansion units are connected to the N pot detection modules in a one-to-one correspondence, and the first common connection terminal is connected to the first interface of the control module, so that the control module can receive N pot detection signals output by the N pot detection modules through multiple first interfaces, and the number of first interfaces is much smaller than the number of pot detection modules. Therefore, the electromagnetic heating circuit in the present application can realize the input expansion of the control module by setting the first expansion module, thereby saving the interface resources of the control module and reducing the difficulty of chip selection.

[0013] Further, the first redundant connection end of the first expansion unit is connected to the first common connection end of the first designated expansion unit among the multiple first expansion units, and the first designated expansion unit and the first redundant connection end are not the same first expansion unit. That is to say, the first redundant connection end of each first expansion unit in the present application is connected to the first common connection end of other first expansion units (that is, 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 the first common connection end and the first redundant connection end, and obtain the first pot detection signal through the first interface connected to the first common connection end, where the first pot detection signal is the pot detection signal received by the first designated expansion unit connected to the first redundant connection end.

[0014] Finally, the control module determines whether the first expansion unit is in a normal working state based on the first pot detection signal. For example, if the signal parameter of the first pot detection signal belongs to the normal parameter range, it means that the branch between the first common connection terminal and the first redundant connection terminal is successfully closed, and the control module can control the first expansion unit normally, indicating that the first expansion unit is in a normal working state. On the contrary, if the signal parameter of the first pot detection signal does not belong to the normal parameter range, it means that the first expansion unit has a fault, and the control module can issue an alarm message to remind the user to repair the electrical equipment in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

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

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

[0018] Figure 3 yes Figure 2 Schematic diagram of the structure of the first expansion module.

[0019] Figure 4 yes Figure 2 Schematic diagram of the structure of the inverter unit.

[0020] Figure 5 yes Figure 2 Schematic diagram of the signal waveform corresponding to the electromagnetic heating circuit shown.

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

[0022] Figure 7 yes Figure 2 Schematic diagram of the structure of the central inspection pot module.

[0023] Figure 8 yes Figure 2 Schematic diagram of the structure of the current detection module.

[0024] Fig. 9 yes Figure 2 Schematic diagram of the structure of the second expansion module.

[0025] Fig.10 yes Figure 2 Schematic diagram of the structure of the temperature detection module.

[0026] Fig.11 yes Figure 2 Schematic diagram of the structure of the third expansion module.

[0027] Fig.12 It is a flowchart of a control method for electrical equipment provided in the first embodiment of the present application.

[0028] Fig.13 It is a flow chart of a control method of an electrical device provided in the second embodiment of the present application.

[0029] Fig.14 It is a flow chart of a control method of an electrical device provided in the third embodiment of the present application.

[0030] Fig.15 It is a flowchart of a control method for electrical equipment provided in the fourth embodiment of the present application.

[0031] Fig.16 It is a module block diagram of a control device for an electrical device provided in an embodiment of the present application.

[0032] Fig.17 It is a module block diagram of the electrical equipment provided in the embodiment of the present application.

[0033] Fig.18 It is a module block diagram of the computer-readable storage medium provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0035] The electromagnetic heating circuit, electrical equipment and control method applied to the electrical equipment proposed in the present application will be further described below in conjunction with specific implementation methods and drawings.

[0036] See also Figure 1 The embodiment of the present application provides an electromagnetic heating circuit 100 and an electrical device 200 equipped with the electromagnetic heating circuit 100. The electrical device 200 is a device that heats a pot placed above the electrical device 200 based on the electromagnetic induction phenomenon. For example, the electrical device 200 can be a full-zone multi-burner stove, an induction cooker, and the like.

[0037] In this embodiment, the electrical device 200 may include a housing 210, a function panel 230 and an electromagnetic heating circuit 100, and the electromagnetic heating circuit 100 may include a plurality of coils 250. The function panel 230 is disposed on the outer surface of the housing 210, and is used to receive a control operation of the user. The electromagnetic heating circuit 100 is disposed inside the housing 210 and is electrically connected to the function panel 230, and is used to operate according to the control operation received by the function panel 230 (for example, controlling one or more coils 250 in the electromagnetic heating circuit 100 to heat). For example, the above-mentioned control operation may include a start operation, a timing operation, a heating mode selection operation, and the like.

[0038] In some possible embodiments, the housing 210 may include a first housing portion (not shown in the figure) and a second housing portion (not shown in the figure), and the first housing portion and the second housing portion cover each other to form a storage space for placing the electromagnetic heating circuit 100, that is, the housing 210 can protect and store the electromagnetic heating circuit 100. Among them, a fixing structure may be provided in the first housing portion, and the fixing structure is used to fix part of the structure of the electromagnetic heating circuit 100. Specifically, the fixing structure includes but is not limited to structures such as a fixing groove, a clamp (for example, an elastic buckle). The outer surface of the second housing portion is provided with an installation groove, and the installation groove is used to install the functional panel 230.

[0039] The function panel 230 may be a touch screen, which may be provided with one or more virtual controls. The function panel 230 may also include one or more physical buttons, which, when triggered by a user's control operation, generate corresponding control signals to instruct the electromagnetic heating circuit 100 to work.

[0040] The coil 250 is used to generate an alternating magnetic field with a continuously changing direction under the excitation of an alternating current, so that an eddy current is generated in a metal conductor (for example, a cooker placed on the electrical device 200) in the alternating magnetic field, and then the metal conductor is heated up under the action of the eddy current, so as to cook the food placed inside the cooker.

[0041] In this embodiment, the number of coils 250 can be multiple, and the multiple coils 250 are arranged inside the housing 210 in a certain arrangement, so that when the pot is placed on the electrical device 200, some of the coils 250 are used to heat it. Therefore, the pot can be placed on the electrical device 200 more flexibly. Specifically, the number of coils 250 can be greater than or equal to 30, for example, the number of coils 250 is 40, 60, 80, etc. Figure 1 In the illustrated embodiment, the number of the coils 250 is 50, and the 50 coils 250 are arranged in 10 columns, and the 10 columns of coils 250 are arranged in sequence and spaced apart in the length direction of the electrical device 200. Figure 1 The dotted coil 270 in the figure is a possible placement position of the cookware. When the cookware is placed in this position, there are coils 1, 2, 6, 7, 8, 12 and 13 to heat it.

[0042] The electromagnetic heating circuit 100 is used to control the coil 250 to work. Specifically, there may be multiple electromagnetic heating circuits 100, and the multiple electromagnetic heating circuits 100 are used to control some of the coils 250 in the multiple coils 250 respectively. Figure 1In the embodiment shown, there are two electromagnetic heating circuits 100, each of which is used to control 25 coils. Specifically, one electromagnetic heating circuit 100 controls coils No. 1 to No. 25, and the other electromagnetic heating circuit 100 controls coils No. 26 to No. 50.

[0043] See also Figure 2 and Figure 3 The electromagnetic heating circuit 100 may include an inverter module 10, N resonance modules 20, N pot detection modules 30 corresponding to the N resonance modules 20, N switching switches 40 corresponding to the N resonance modules 20, a first expansion module 520, and a control module 70, where N is an integer greater than 1. The pot detection module 30 is used to detect whether the resonance module 20 is covered by a pot. The switching switch 40 may be provided with a first common terminal 410, a first active terminal 430, a first position terminal 450, and a second position terminal 470, wherein the first active terminal 430 is connected to the first common terminal 410; the first common terminal 410 is connected to the resonance 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 multiple first expansion units 521, and the first expansion unit 521 may include 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, and any N first connection terminals 5214 in the multiple first expansion units 521 are connected to N pot detection modules 30 in a one-to-one correspondence; the first redundant connection terminal 5212 is connected to the first common connection terminal 5210 of the first designated expansion unit in the multiple first expansion units 521.

[0045] It should be noted that the first designated expansion unit and the first redundant connection end 5212 are not the same as the first expansion unit 521. That is, the first redundant connection end 5212 of each first expansion unit 521 in the present application is connected to the first common connection end 5210 of other first expansion units 521 (that is, the first designated expansion unit). Figure 3In the illustrated embodiment, the number of the first expansion units 521 is two, namely, the first expansion unit 521a and the first expansion unit 521b. The first redundant connection end 5212 of the first expansion unit 521a is connected to the first common connection end 5210 of the first expansion unit 521b, and the first redundant connection end 5212 of the first expansion unit 521b is connected to the first common connection end 5210 of the first expansion unit 521a. It is not difficult to understand that, for the first expansion unit 521a, the first expansion unit 521b is the first designated expansion unit; 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 the N switching switches 40 , respectively. The control module 70 includes a plurality of first interfaces 700 , and the plurality of first interfaces 700 are connected to the first common connection terminals 5210 of the plurality of first expansion units 521 in a one-to-one correspondence.

[0047] In the electromagnetic heating circuit 100 provided in the present application, since any N first connection terminals 5214 of the plurality of first extension units 521 are connected to the N pot detection modules 30 one by one, 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 the first interfaces 700 is much smaller than the number of the pot detection modules 30. For example, in Figure 3 In the embodiment shown, the control module 70 can receive N-way pot detection signals through two first interfaces 700. Therefore, the electromagnetic heating circuit 100 in the present application can realize input expansion 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 the first common connection terminal 5210 and the first redundant connection terminal 5212 included therein, and obtain the first pot detection signal through the first interface 700 connected to the first common connection terminal 5210. The first pot detection signal here 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 a normal working state based on the first pot detection signal. For example, if the signal parameter of the first pot detection signal belongs to the normal parameter range, it means that the branch between the first common connection terminal 5210 and the first redundant connection terminal 5212 is successfully closed, and the control module 70 can control the first expansion unit 521 normally, indicating that the first expansion unit 521 is in a normal working state. On the contrary, if the signal parameter of the first pot detection signal does not belong to the normal parameter range, it means that the first expansion unit 521 has a fault, and the control module 70 can issue an alarm message to remind the user to repair the electrical device 200 in time.

[0050] The specific implementation of each module in the electromagnetic heating circuit 100 is introduced below.

[0051] The inverter module 10 is used to supply power to the N resonance modules 20. Specifically, the inverter module 10 can output an alternating current to the resonance module 20, thereby causing the coil in the resonance module 20 to generate an alternating magnetic field, thereby heating the pot placed in the alternating magnetic field.

[0052] In this embodiment, the inverter module 10 may include M inverter units 120, and the inverter unit 120 is provided with a signal terminal 1210 and an output terminal 1230, wherein the signal terminal 1210 is connected to the control module 70, and the output terminal 1230 is connected to the N resonance modules 20, and M may be an integer greater than 0. Specifically, M may be equal to 1, 2, 3, etc. In this embodiment, the value of M is equal to the number of pots that can be heated simultaneously on the electromagnetic heating circuit 100. Figure 1 In the illustrated embodiment, two pots can be placed on the 25 coils 250 corresponding to the electromagnetic heating circuit 100 at the same time, and the number of the inverter units 120 can be two. Therefore, when two pots need to be heated at the same time, different inverter units 120 can independently control the multiple coils covered by different pots, and the multiple coils covered by the same pot are controlled by the same inverter unit 120, so that the two pots can 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, and the control module 70 can adjust the heating power of different pots by adjusting the signal parameters of the drive pulse signal (for example, duty cycle, signal frequency).

[0053] In some possible embodiments, the inverter unit 120 may be an inverter circuit (eg, a single-phase half-bridge inverter circuit, a single-phase full-bridge inverter circuit, etc.). Figure 4The number of the signal terminals 1210 of the inverter unit 120 is two, and the two signal terminals 1210 include a first signal terminal 1212 and a second signal terminal 1214, and 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 at a high level, the second pulse signal PWM_L is at a low level, and when the first pulse signal PWM_H is at a low level, the second pulse signal PWM_L is at a high level. Please refer to Figure 5 , Figure 5 Part (a) is the waveform curve of the first pulse signal PWM_H. Figure 5 Part (b) is the waveform curve of the second pulse signal PWM_L.

[0054] Please refer again Figure 4 , the inverter unit 120 may include a first switch tube Q1, a second switch tube Q2, a first resonant absorption capacitor CM1, and a second resonant absorption capacitor CM2. The first end 11 of the first switch tube Q1 is connected to the first power supply end 21, the control end 12 of the first switch tube Q1 is connected to the first signal end 1212, and the second end 13 of the first switch tube Q1 is connected to the first end 15 of the second switch tube Q2. The control end 16 of the second switch tube Q2 is connected to the second signal end 1214, and the second end 17 of the second switch tube Q2 is grounded. Specifically, the first switch tube Q1 and the second switch tube Q2 may be insulated-gate bipolar transistors (IGBTs), respectively, wherein the first end 11 of the first switch tube Q1 and the first end 15 of the second switch tube Q2 are collectors of the IGBT, the control end 12 of the first switch tube Q1 and the control end 16 of the second switch tube Q2 are gates of the IGBT, and the second end 13 of the first switch tube Q1 and the second end 17 of the second switch tube Q2 are emitters of the IGBT. Therefore, the inverter unit 120 in this embodiment adopts the structure of a single-phase half-bridge inverter circuit, and the first switch tube Q1 and the second switch tube Q2 can be in a complementary conduction state under the control of the first pulse signal PWM_H and the second pulse signal PWM_L. The first power supply terminal 21 is used to provide a DC voltage VBUS, and the DC voltage VBUS can be a voltage after the mains voltage is rectified by a rectifier circuit, that is, the amplitude of the DC voltage VBUS can be 220V.

[0055] The first resonant absorption capacitor CM1 is connected between the first end 11 and the second end 13 of the first switch tube Q1. The second resonant absorption capacitor CM2 is connected between the first end 15 and the second end 17 of the second switch tube Q2. The first resonant absorption capacitor CM1 can be used to absorb the peak voltage at the first switch tube Q1 to prevent the first switch tube Q1 from being damaged. The second resonant absorption capacitor CM2 can be used to absorb the peak voltage at the second switch tube Q2 to prevent the second switch tube Q2 from being damaged.

[0056] In this example, please refer again to Figure 2 The electromagnetic heating circuit 100 may further include N source selection switches 80 corresponding one-to-one to the N resonance modules 20 , and the source selection switch 80 is connected between the M inverter units 120 and the resonance module 20 , and is used to conduct a branch between one of the inverter units 120 and the resonance module 20 .

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

[0058] Therefore, when the second active end 830 is connected to different third position ends 850, the source selection switch 80 can conduct branches between different inverter units 120 and the resonance 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 the value of M is 2, the source selection switch 80 can be a single-pole double-throw relay.

[0059] In this embodiment, the resonance module 20 is used to generate an alternating magnetic field under the excitation of an alternating current. Figure 6, the resonance module 20 may include a coil LX, a first resonant capacitor CX1 and a second resonant capacitor CX2. Among them, one end of the first resonant capacitor CX1 and the second resonant capacitor CX2 connected in series 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 end 410 of the switching switch 40, and the second end 214 is connected to the common end between the first resonant capacitor CX1 and the second resonant capacitor CX2. Specifically, when the branch between the resonance module 20 and one of the inverter units 120 is turned on, when the first switch tube Q1 in the inverter unit 120 is turned on, the coil LX and the second resonant capacitor CX2 resonate; when the second switch tube Q2 in the inverter unit 120 is turned on, the coil LX and the first resonant capacitor CX1 resonate.

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

[0061] In this embodiment, the switching switch 40 is respectively connected to the resonance module 20, the pot detection module 30 and the inverter module 10, and is used to conduct the branch between the resonance module 20 and the pot detection module 30, or conduct the branch between the resonance module 20 and the inverter module 10. The switching switch 40 may be provided with a first common terminal 410, a first active terminal 430, a first position terminal 450 and a second position terminal 470, the first active terminal 430 is connected to the first common terminal 410, the first common terminal 410 is connected to the resonance 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 output terminal 140 of the inverter unit 120. Specifically, in Figure 2 In the illustrated embodiment, the first common terminal 410 is connected to the first end 212 of the coil LX in the resonance 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 resonance module 20 .

[0062] Therefore, when the first active end 430 is connected to the first position end 450, the switching switch 40 can conduct the branch between the resonance module 20 and the pot detection module 30, so that the pot detection module 30 can detect whether a pot is placed above the resonance module 20; when the first active end 430 is connected to the second position end 470, the switching switch 40 can conduct the branch between the resonance module 20 and the inverter module 10, so that the inverter module 10 can supply power to the resonance module 20. Specifically, the switching switch 40 can be a relay switch, for example, a single-pole double-throw relay.

[0063] It should be noted here that in order to avoid the situation where the inverter module 10 supplies power to the resonance module 20 when the resonance module 20 is not covered by the cookware, the second position end 470 of the switching switch 40 in this embodiment is the normally open contact of the single-pole double-throw relay, and the first position end 450 is the normally closed contact of the single-pole double-throw relay.

[0064] In this embodiment, the pot detection module 30 is used to detect whether the resonance module 20 is covered by the pot. Specifically, when the branch between the resonance module 20 and the pot detection module 30 is connected and the resonance module 20 is covered by the pot, the inductance value of the coil LX in the resonance 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 of the coil inductance value. The control module 70 then determines whether the resonance module 20 is covered by the pot based on the above pot detection signal. Please refer to 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 end 3100 , which is connected to the first position end 450 of the switching switch 40 . The detection end 3100 is used to output a detection signal, which is used to represent the change of the inductance value of the resonance module connected to the oscillation unit 310 .

[0066] In some possible embodiments, the oscillation unit 310 may be an oscillation circuit (for example, an inductor three-point oscillation circuit, a capacitor three-point oscillation circuit). Here, the oscillation unit 310 is a capacitor three-point oscillation circuit for the purpose of introduction. 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. Among them, the control terminal 31 of the transistor Q3 is connected to the second power supply terminal 23 through the third resistor R3, and is grounded through the fourth resistor R4. The first terminal 33 of the transistor Q3 is connected to the detection terminal 3100, and is connected to the second power supply terminal 23 through the fifth resistor R5. The second terminal 35 of the transistor Q3 is grounded through the sixth resistor R6. Among them, the second power supply terminal 23 is used to provide a first power supply voltage VDD, and the first power supply voltage VDD is a DC voltage. For example, the amplitude of the first power supply voltage VDD can be 2.5V, 3V, etc.

[0067] As an implementation, the transistor Q3 may be a bipolar junction transistor (BJT), the control terminal 31 of the transistor Q3 is the base of the BJT tube, the first terminal 33 of the transistor Q3 is the collector of the BJT tube, and the second terminal 35 of the transistor Q3 is the emitter of the BJT tube. The third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are current limiting resistors, respectively, wherein the third resistor R3 and the fourth resistor R4 are used to limit the base current of the BJT tube, the fifth resistor R5 is used to limit the collector current of the BJT tube, and the sixth resistor R6 is used to limit the emitter current of the BJT tube.

[0068] The first capacitor C1 is connected between the first end 33 and the second end 35 of the transistor Q3, the second capacitor C2 and the sixth resistor R6 are connected in parallel, and the third capacitor C3 and the fourth resistor R4 are connected in parallel. One end of the fourth capacitor C4 and the inductor L is connected in series to the detection end 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 resonance module 20, the signal frequency of the detection signal output by the detection end 3100 is the resonance 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 pot detection module 30 is connected to the resonance module 20, the coil LX, the first resonant capacitor CX1 and the second resonant capacitor CX2 in the resonance 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 regarded as being connected in parallel with the branch where the fourth capacitor C4 and the inductor L are located. At this time, the signal frequency of the detection signal output by the detection end 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 by the following frequency calculation formula.

[0070]

[0071] Wherein, f is the signal frequency of the detection signal, L is the equivalent inductance value of the oscillation unit 310 and the resonance module 20, and C is the equivalent capacitance value of the oscillation unit 310 and the resonance module 20. Specifically, when the resonance module 20 is covered by the pot, the equivalent inductance value of the coil LX will decrease, and the equivalent inductance value of the oscillation unit 310 and the resonance module 20 will also decrease, so that the signal frequency of the detection signal becomes larger.

[0072] The voltage pull-up unit 330 is connected between the detection terminal 3100 of the oscillation unit 310 and the positive phase input terminal 3501 of the signal comparison unit 350, and is used to pull up the voltage value of the detection signal so that the detection signal after the voltage pull-up can be smoothly input into the signal comparison unit 350. Specifically, the voltage pull-up unit 330 includes a seventh resistor R7 and an eighth resistor R8, wherein the seventh resistor R7 is connected between the second power supply terminal 23 and the positive phase input terminal 3501, and one end of the eighth resistor R8 is connected to the positive phase input terminal 3501, and the other end is grounded. The seventh resistor R7 and the eighth resistor R8 are respectively voltage-dividing resistors, which are used to divide the first power supply voltage VDD input from the second power supply terminal 23, so that the voltage input to the positive phase input terminal 3501 of the signal comparison unit 350 is the superimposed voltage of the VDD after voltage division 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 end 3100 of the oscillation unit 310, and the other end of which is connected to the non-inverting input end 3501. The fifth capacitor C5 is an isolation capacitor, and the fifth capacitor C5 can isolate the first power supply voltage VDD input by the transistor Q3 in the oscillation unit 310 to prevent the first power 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 positive input terminal 3501 of the voltage comparator 3500 is connected to the voltage pull-up unit 330, the negative input terminal 3503 of the voltage comparator 3500 is used to input the first reference voltage Vref1, and the output terminal 3505 of the voltage comparator 3500 is connected to the control module 70. Specifically, the first reference voltage Vref1 can be determined based on the voltage value of the first power supply voltage VDD divided by the seventh resistor R7 and the eighth resistor R8, for example, the two can be approximately equal. The voltage comparator 3500 is used to compare the voltage between the positive input terminal 3501 and the negative input terminal 3503. When the input voltage of the positive input terminal 3501 is greater than the input voltage of the negative input terminal 3503, the output terminal 3505 of the voltage comparator 3500 can output a high level signal; when the input voltage of the positive input terminal 3501 is less than the input voltage of the negative input terminal 3503, the output terminal 3505 of the 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 resonance module 20 is covered by the 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. The ninth resistor R9 in this embodiment 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. The sixth capacitor C6 in this embodiment is a filter capacitor, which is used to ensure that the noise signal in the pot detection signal is filtered out to avoid the influence of the noise signal on 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 end 3100 of the oscillation unit 310 and the first position end 450 of the switching switch 40, and can isolate the DC voltage VBUS input by the resonance module 20 to prevent the DC voltage VBUS 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 end 3100 of the oscillation unit 310 and the first position end 450 of the switching switch 40. It is not difficult to understand here that when the pot detection module 30 is connected to the resonance module 20, the seventh capacitor C7 and the fifth capacitor C5 mentioned above will also participate in the resonance between the pot detection module 30 and the resonance 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 implement the control module 70 to perform input expansion on the N pot detection signals. The first expansion module 520 may include a plurality of first expansion units 521, the first expansion unit 521 includes a first common connection terminal 5210, a first redundant connection terminal 5212 and a plurality of first connection terminals 5214, and the total number of the 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 to the N pot detection modules 30 in a one-to-one correspondence; 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.

[0079] Specifically, in this embodiment, any N first connection terminals 5214 of the plurality of first expansion units 521 are connected one-to-one to 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, and the plurality of first interfaces 700 are connected one-to-one to the first common connection terminals 5210 of the plurality of first expansion units 521.

[0080] Here, the number of the first expansion units 521 is two as an example. 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 end 5212 of the first expansion unit 521a is connected to the first common connection end 5210 of the first expansion unit 521b, and the first redundant connection end 5212 of the first expansion unit 521b is connected to the first common connection end 5210 of the first expansion unit 521a.

[0081] Specifically, the first expansion unit 521 can be a multi-way selection switch, the first redundant connection terminal 5212 and the plurality of first connection terminals 5214 are selection terminals of the multi-way selection switch, and the first common connection terminal 5210 is the common terminal of the multi-way selection switch. The model and number of the multi-way selection switch can be determined according to the number of the pot detection modules 30, and are not specifically limited in this embodiment. Here, N is 25 as an example for explanation. When the number of the first expansion units 521 is two, the first expansion unit 521 can be a sixteen-to-one 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 to the 25 pot detection modules 30 in a one-to-one correspondence.

[0082] In some other possible embodiments, the number of first expansion units 521 is three, four, etc. In this case, the first redundant connection end 5212 of each first expansion unit 521 is connected to the first common connection end 5210 of other first expansion units 521 (i.e., the first designated expansion unit). This embodiment does not specifically limit the specific connection method of the 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. The first control terminal is used to receive a first control signal sent by the control module 70, so that the first expansion unit 521, under the action of the first control signal, conducts a branch between the designated first connection terminal 5214 and the first common connection terminal 5210, or conducts a branch between the designated first redundant connection terminal 5212 and the first common connection terminal 5210. Specifically, the first control terminal may be a control signal terminal of a multi-way selection 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, and the number of first interfaces 700 is much smaller than the number of pot detection modules 30. Figure 3 In the embodiment shown, the control module 70 can receive N-way pot detection signals through two first interfaces 700. Therefore, the electromagnetic heating circuit 100 in the present application can realize input expansion 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] Further, in this embodiment, each first expansion unit 521 reserves a connection end (that is, the first redundant connection end 5212) and is connected to the first common connection end 5210 of other first expansion units 521, so that the control module 70 can implement abnormality detection of the first expansion unit 521. Specifically, the specific implementation manner of the control module 70 performing abnormality detection on the first expansion unit 521 is described in detail in the method embodiment below.

[0086] In this embodiment, the electromagnetic heating circuit 100 may also include N current detection modules 50 corresponding one-to-one to the N resonance modules 20. The current detection module 50 is connected between the first common terminal 410 of the switching switch 40 and the resonance module 20, and is used to obtain a current detection signal, which is used to characterize the current change of the branch where the current detection module 50 is located.

[0087] See also 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 resonance module 20, and is used to obtain the current signal of the branch where the current detection unit 520 is located.

[0088] Specifically, the input end 5200 of the current detection unit 520 may include a first input end 5201 and a second input end 5203, the first input end 5201 is connected to the first common end 410 of the switching switch 40, and the second input end 5203 is connected to the first end 212 of the coil LX in the resonance module 20. Therefore, the current detection unit 520 is connected in series in the branch where the resonance module 20 is located through the first input end 5201 and the second input end 5203, and it can obtain the current signal of the branch where the current detection unit 520 is located. Please refer again Figure 5 , Figure 5 Part (c) in the figure is the waveform diagram corresponding to the current signal. It is not difficult to see from the current waveform diagram that the current in the branch where the current detection unit 520 is located is an alternating current, that is, under the control of the first pulse signal PWM_H and the second pulse signal PWM_L, the current direction is constantly changing. Specifically, under the control of the first pulse signal PWM_H, the current direction is in the positive direction, and the current amplitude is greater than 0; under the control of the second pulse signal PWM_L, the current direction is in the reverse direction, and the current amplitude is less than 0.

[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 here that since the inverter module 10 and the resonance module 20 are respectively connected to the mains, the current value of the branch where the resonance module 20 is located is relatively large, so it is necessary to reduce the current value through a current transformer to match the subsequent circuit. Among them, the output terminal 5220 of the current detection unit 520 may include a first output terminal 5221 and a second output terminal 5221, and the first output terminal 5221 and the second output terminal 5223 are used to connect the voltage conversion unit 540, and the second output terminal 5223 is grounded.

[0090] The 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, and is used to convert the current signal output by the current detection unit 520 into a voltage signal across the first resistor R1. The positive electrode of the diode D is connected to the first output terminal 5221, and the negative electrode of the diode D is connected to the current detection terminal 52, and the current detection terminal 52 is used to connect to the control module 70. Since the first resistor R1 is a pure resistive load, the change trend of the voltage on both sides of the first resistor R1 is consistent with the change trend of the current in the branch where the current detection unit 520 is located. The diode D is used to rectify the voltage signal so that the voltage signal after rectification only retains the signal of the positive half cycle. Please refer again Figure 5 , Figure 5 Part (d) in FIG. 5 is a waveform diagram of a signal outputted from the current detection terminal 52 (ie, a current detection signal).

[0092] One end of the second resistor R2 is connected to the cathode of the diode D, and the other end is connected to the second output terminal 5223. The second resistor R2 shunts the current detection signal to reduce the amplitude of the current detection signal so that the current detection signal can 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, and is used to implement the control module 70 to expand the input of the N current detection signals. Fig. 9 , the second expansion module 540 may include a plurality of second expansion units 541, the second expansion unit 541 includes a second common connection terminal 5410, a second redundant connection terminal 5412 and a plurality of second connection terminals 5414, and the total number of second connection terminals 5414 included in the plurality of second expansion units 541 is greater than or equal to N. Any N second connection terminals 5414 in the plurality of second expansion units 541 are connected to the N current detection modules 50 in a one-to-one correspondence; the second redundant connection terminal 5412 is connected to the second common connection terminal 5410 of the second designated expansion unit in the plurality of second expansion units 541. It should be noted here that the second designated expansion unit and the second redundant connection terminal 5412 are located in different second expansion units 541.

[0094] Specifically, in this embodiment, any N second connection terminals 5414 in the plurality of second expansion units 541 are connected one-to-one to 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 to the second common connection terminals 5410 of the plurality of second expansion units 541.

[0095] Here, the number of the second expansion units 541 is two as an example for description. Fig. 9In the illustrated embodiment, the two second expansion units 541 include a second expansion unit 541a and a second expansion unit 541b, wherein the second redundant connection end 5412 of the second expansion unit 541a is connected to the second common connection end 5410 of the second expansion unit 541b, and the second redundant connection end 5412 of the second expansion unit 541b is connected to the second common connection end 5410 of the second expansion unit 541a. It is easy to understand that, for the second expansion unit 541a, the second expansion unit 541b is the second designated expansion unit; 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 multi-way selection switch, the second redundant connection terminal 5412 and the plurality of second connection terminals 5414 are the selection terminals of the multi-way selection switch, and the second common connection terminal 5410 is the common terminal of the multi-way selection switch. The model and number of the multi-way selection switch can be determined according to the number of current detection modules 50, and are not specifically limited in this embodiment. Here, N is 25 as an example for explanation. When the number of the second expansion units 541 is two, the second expansion unit 541 can be a sixteen-to-one 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 to the 25 current detection modules 50 one by one.

[0097] In some other possible embodiments, the number of the second expansion units 541 is three, four, and so on. 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 (i.e., the second designated expansion unit). This embodiment does not specifically limit the specific connection method of the 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. The second control terminal is used to receive a second control signal sent by the control module 70, so that the second expansion unit 541, under the action of the second control signal, conducts a branch between the designated second connection terminal 5414 and the second common connection terminal 5410, or conducts a branch between the designated second redundant connection terminal 5412 and the second common connection terminal 5410. Specifically, the second control terminal may be a control signal terminal of a multi-way selection 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, and the number of second interfaces 720 is much smaller than the number of current detection modules 50. Fig. 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 the present application can achieve input expansion of the control module 70 by setting the second expansion module 540, thereby saving interface resources of the control module 70 and reducing the difficulty of chip selection.

[0100] Further, in this embodiment, each second expansion unit 541 reserves a connection end (that is, the second redundant connection end 5412) and is connected to the second common connection end 5410 of other second expansion units 541, so that the control module 70 can implement abnormality detection of the second expansion unit 541. Specifically, the specific implementation method of the control module 70 for abnormality detection of the second expansion unit 541 is described in detail in the following method embodiment.

[0101] exist Fig. 9 In the illustrated embodiment, the control module 70 includes a plurality of comparators 710 corresponding one-to-one to the plurality of second interfaces 720. The plurality of comparators 710 may be built into the control module 70, wherein the non-inverting input terminal of the comparator 710 is connected to the second interface 720. Therefore, the input signal of the non-inverting input terminal of the comparator 710 is a current detection signal, that is, Figure 5 The inverting input terminal of the comparator 710 is used for the second reference voltage Vref2, wherein the second reference voltage Vref2 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 the 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, the comparator 710 can convert the input current detection signal into a PWM wave of the same frequency. Please refer to Figure 5 , Figure 5 Part (e) in FIG. 7 is a waveform diagram of the output signal of the comparator 710 .

[0103] In this example, please refer again to Figure 2 The electromagnetic heating circuit 100 may further include N temperature detection modules 90 corresponding to the N resonance modules 20, and the temperature detection module 90 is used to obtain the temperature information of the resonance module 20. The temperature detection module 90 may be provided with a temperature detection terminal 92, which is connected to the control module 70 and is used to output a temperature detection signal to the control module 70, and the temperature detection signal is used to represent the temperature of the space where the resonance module 20 is located.

[0104] See also Fig.10 The temperature detection module 90 may include a thermistor Rt, a tenth resistor R10 and an eighth capacitor C8, wherein one end of the thermistor Rt is connected to one end of the tenth resistor R10 to form a common end 91, the common end 91 is connected to the temperature detection end 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 end 23. Therefore, the temperature detection signal output by the temperature detection end 92 is a voltage signal after the power supply voltage VDD is divided by the thermistor Rt and the tenth resistor R10. Since the resistance value of the thermistor Rt changes with the change of temperature, the temperature detection signal can reflect the temperature change of the space where the resonance module 20 is located.

[0105] One end of the eighth capacitor C8 is connected to the temperature detection end 92, and the other end is grounded. The eighth capacitor C8 is a filter capacitor, which is used to filter out noise signals in the temperature detection signal to avoid the influence of the noise signal on 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, and is used to implement the control module 70 to expand the input of the N temperature detection signals. Fig.11 , the third expansion module 560 may include a plurality of third expansion units 561, the third expansion unit 561 includes a third common connection terminal 5610, a third redundant connection terminal 5612 and a plurality of third connection terminals 5614, and the total number of the third connection terminals 5614 included in the plurality of third expansion units 561 is greater than or equal to N. Any N third connection terminals 5614 in the plurality of third expansion units 561 are connected to the N temperature detection modules 90 in a one-to-one correspondence; the third redundant connection terminal 5612 is connected to the third common connection terminal 5610 of the third designated expansion unit in the plurality of third expansion units 561. It should be noted here 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 in the plurality of third expansion units 561 are connected one-to-one to the temperature detection terminals 92 of the N temperature detection modules 90. The control module 70 may further include a plurality of third interfaces 740, which are connected one-to-one to the third common connection terminals 5610 of the plurality of third expansion units 561.

[0108] Here, the number of the third expansion units 561 is two as an example. Fig.11In the embodiment of the present invention, 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 not difficult to understand that, for the third expansion unit 561a, the third expansion unit 561b is the third designated expansion unit; 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 multi-way selection switch, the third redundant connection terminal 5612 and the plurality of third connection terminals 5614 are the selection terminals of the multi-way selection switch, and the third common connection terminal 5610 is the common terminal of the multi-way selection switch. The model and number of the multi-way selection switch can be determined according to the number of the temperature detection modules 90, and are not specifically limited in this embodiment. Here, N is 25 as an example for illustration. When the number of the third expansion units 561 is two, the third expansion unit 561 can be a sixteen-to-one 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 to the 25 temperature detection modules 90 in a one-to-one correspondence.

[0110] In some other possible embodiments, the number of the third expansion units 561 is three, four, and so on. 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 (i.e., the third designated expansion unit). This embodiment does not specifically limit the specific connection method of the 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. The third control terminal is used to receive a third control signal sent by the control module 70, so that the third expansion unit 561, under the action of the third control signal, conducts a branch between the designated third connection terminal 5614 and the third common connection terminal 5610, or conducts a branch between the designated third redundant connection terminal 5612 and the third common connection terminal 5610. Specifically, the third control terminal may be a control signal terminal of a multi-way selection 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, and the number of third interfaces 740 is much smaller than the number of temperature detection modules 90. Fig.11In the embodiment, the control module 70 can receive N temperature detection signals through two third interfaces 740. Therefore, the electromagnetic heating circuit 100 in the present application can realize input expansion 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] Further, each third expansion unit 561 in this embodiment reserves a connection end (that is, the third redundant connection end 5612) and is connected to the third common connection end 5610 of other third expansion units 561, so that the control module 70 can implement abnormality detection of the third expansion unit 561. Specifically, the specific implementation manner of the control module 70 performing abnormality 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, and the control module 70 is used to send a driving pulse signal to the inverter module 10, and the driving pulse signal is used to control the inverter module 10 to supply power to the N resonance 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 implements the input expansion of the signal 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 method embodiment below.

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

[0116] See also Fig.12 , Fig.12 A control method for an electrical device provided in the first embodiment of the present application is schematically shown. Specifically, the method includes the following process.

[0117] Step S1210: determining a first target expansion unit in response to the detection indication.

[0118] In this embodiment, the first target expansion unit is the first expansion unit to be detected among the multiple first expansion units. As an implementation mode, the control module can perform fault detection on the multiple first expansion units in sequence and determine the first expansion unit that currently needs to be detected as the first target expansion unit.

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

[0120] In some other possible embodiments, the detection indication may be manually triggered by a user. For example, a button corresponding to fault detection may be provided on the function panel of the electrical device. If the button is triggered by the user, it indicates that the user has a need to perform fault detection on the electrical device. At this time, the function panel sends a detection indication to the control module, and the control module further determines the first target expansion unit in response to the detection indication.

[0121] Step S1220, controlling the branch circuit between the first target expansion unit and the target pot detection module to be turned on.

[0122] In this embodiment, the target pot detection module is connected to the first designated expansion unit connected to the first redundant connection end of the first target expansion unit. Figure 3 Here, taking the first target expansion unit as the first expansion unit 521a as an example, the first designated expansion unit is the first expansion unit 521b, and the target pot detection module may be any one of the multiple pot detection modules connected to the first expansion unit 521b.

[0123] Therefore, when the control module controls the conduction of the branch between the first target expansion unit and the target pot detection module, it is necessary to control the conduction of the branch between the first common connection terminal and the first redundant connection terminal included in the first expansion unit 521a, and control the conduction of the branch between the first common connection terminal and the target detection module included in the first expansion unit 521b.

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

[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, wherein 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 a normal working state.

[0127] Here, the working state of the first target expansion unit is first described. If the first target expansion unit is in a normal working state, the control module can smoothly control the first target expansion unit to conduct the branch between the first common connection terminal and the first redundant connection terminal included therein. In this case, the control module can smoothly obtain the first pot detection signal sent by the target pot detection module from the first interface connected to the first target expansion unit. On the contrary, if the first target expansion unit is in an abnormal working state, the control module may not be able to control the first target expansion unit to conduct the branch between the first common connection terminal and the first redundant connection terminal included therein. In this case, the control module may not be able to obtain the first pot detection signal from the first interface, or the first pot detection signal may be abnormal. It is not difficult to understand here that when the control module determines whether the first target expansion unit is in a normal working state, it assumes that the first designated expansion unit and the switching switch corresponding to the target pot detection module are in a normal working state.

[0128] In some possible embodiments, the control module may determine whether the first target expansion unit is in a normal working state based on the signal parameter of the first pot detection signal. Specifically, step S1240 may include step S1241 and step S1242.

[0129] Step S1241, obtaining a first signal frequency of a first pot detection signal.

[0130] As an implementation mode, a timer may be provided in the control module. When the first pot detection signal is converted from a low level to a high level for the nth time, the timer records the current moment as the first moment; when the first pot detection signal is converted from a low level to a high level for the n+1th time, the timer records the current moment as the second moment. The control module determines the duration between the second moment and the first moment as the signal period, and further determines the inverse of the signal period as the first signal frequency.

[0131] Step S1242: When the first signal frequency belongs to a preset frequency interval, it is determined that the first target extension unit is in a normal working state.

[0132] In this embodiment, the frequency interval represents the range of the first signal frequency when the target pot detection module and the first target expansion unit are normally connected. For example, when performing hardware testing on electrical equipment, R&D personnel can directly connect the pot detection module and the resonance module to obtain multiple groups of test data detected by the pot detection module, and summarize the above frequency interval based on the multiple groups of test data.

[0133] The control module determines that the first target expansion unit is in a normal working state when the first signal frequency belongs to a preset frequency interval. Otherwise, the control module determines that the first target expansion unit is in an abnormal working state when the first signal frequency does not belong to the preset frequency interval.

[0134] As a possible implementation, when the control module determines that the first target expansion unit is in an abnormal working 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 smart phone) that is connected to the electrical device to remind the user to repair the electrical device to ensure the normal use of the electrical device. Exemplarily, the content of the alarm message can be "Circuit failure, please repair".

[0135] As another possible implementation, when the control module determines that the first target expansion unit is in an abnormal working state, it can also generate a fault record, which can be stored in the control module, and is used to help maintenance personnel quickly locate the faulty hardware when they perform maintenance. For example, the content of the fault record can be "At XX time, the first expansion module failed."

[0136] In some other possible embodiments, the control module can also obtain the second pot detection signal sent by the target pot detection module through the first interface connected to the first designated extension unit, and determine whether the first target extension unit is in normal working condition by comparing the first pot detection signal and the second pot detection signal. It is not difficult to understand here that since the control module assumes that the first designated extension unit and the switch corresponding to the target pot detection module are in normal working condition, it means that the second pot detection signal is a normal pot detection signal. Therefore, the control module can determine whether the first target extension unit is in normal working condition by comparing whether the signal parameters of the first pot detection signal and the second pot detection signal are consistent. That is, when the signal parameters of the first pot detection signal and the second pot detection signal are roughly the same, the control module can determine that the first target extension unit is in normal working condition. Specifically, the specific implementation method of the control module to judge the working state of the first target extension unit through two pot detection signals is introduced in the following embodiments.

[0137] This embodiment provides a control method for electrical equipment, through which the control module can detect whether multiple first expansion units are in an abnormal working state, and 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 to ensure the normal use of the electrical equipment.

[0138] See also Fig.13 , Fig.13A control method for an electrical device provided in the second embodiment of the present application is schematically shown. Specifically, the method includes the following process.

[0139] Step S1310: determining a first target expansion unit in response to the detection indication.

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

[0141] Step S1320, controlling the branch circuit between the first target expansion unit and the target pot detection module to be turned on.

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

[0143] Step S1321: Control the first target expansion unit to switch on a branch between the first common connection terminal and the first redundant connection terminal included therein.

[0144] In this embodiment, the control module may send a first designated control signal to the first control terminal of the first target expansion unit, where the first designated control signal is used to instruct the first target expansion unit to switch on a branch between the first common connection terminal and the first redundant connection terminal included therein.

[0145] Step S1322: Control the first designated extension unit to conduct a branch between the first common connection terminal and the first target connection terminal among the 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, and the second designated control signal is used to instruct the first designated extension unit to conduct the branch between the first common connection terminal and the first target connection terminal.

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

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

[0149] It should be noted here that there is no time sequence in the execution of steps S1321 to S1323, that is, steps S1321 to S1323 can be executed by the control module simultaneously, or can be executed by the control module one by one.

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

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

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

[0153] Step S1341: Acquire a second pot detection signal sent by a target pot detection module through a first interface to which a first designated extension unit is connected.

[0154] In this embodiment, there is no time sequence in the execution of step S1330 and step S1341, that is, step S1330 and step S1341 can be executed by the control module at the same time, or can be executed by the control module one by one.

[0155] Step S1342, obtaining a first signal frequency of the first pot detection signal and a second signal frequency of the second pot detection signal.

[0156] As an implementation mode, a timer may be provided in the control module. When the second pot detection signal is converted from a low level to a high level for the nth time, the timer records the current moment as the third moment. When the second pot detection signal is converted from a low level to a high level for the n+1th time, the timer records the current moment as the fourth moment. The control module determines the duration between the fourth moment and the third moment as the signal period, and further determines the reciprocal of the signal period as the second signal frequency.

[0157] The method for obtaining the first signal frequency of the first pot detection signal can refer to the relevant introduction in step S1241, which will not be repeated here.

[0158] Step S1343: When 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, it is determined that the first target expansion unit is in a normal working state.

[0159] In this embodiment, the first specified difference may be a preset value in the control module, or may be adjusted by the R&D personnel based on the specific working conditions of the electrical equipment. Specifically, the first specified difference may be greater than or equal to 0 Hz, and less than or equal to 15 Hz. For example, the first specified difference may be 5 Hz, 10 Hz, and so on. When 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 substantially the same, thereby determining that the first target expansion unit is in a normal working state. Conversely, when 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 working state.

[0160] This embodiment provides a control method for an electrical device, in which the control module can determine whether the first target expansion unit is in a normal working state by only comparing whether the signal parameters of the two pot detection signals are substantially the same. Compared with the technical solution of determining the working state of the first target expansion unit by only using the signal parameters of one pot detection signal, the R&D personnel do not need to pre-test and store the normal parameter range of the signal parameters, thereby saving the testing cost of the electrical device.

[0161] See also Fig.14 , Fig.14 A control method for an electrical device provided in the third embodiment of the present application is schematically shown. In this method, an implementation mode of the control module detecting whether the second expansion unit is faulty is introduced. Specifically, the method includes the following process.

[0162] Step S1410: determine a second target expansion unit.

[0163] In this embodiment, the second target expansion unit is the second expansion unit to be detected. As an implementation mode, the control module may perform fault detection on multiple second expansion units in sequence, and determine the second expansion unit that currently needs to be detected as the second target expansion unit.

[0164] In this embodiment, in response to the detection indication, the control module may first sequentially detect the faults of the plurality of first expansion units, and then sequentially detect the faults of the plurality of second expansion units. Alternatively, the control module may first sequentially detect the faults of the plurality of second expansion units, and then sequentially detect the faults of the plurality of first expansion units. This embodiment does not specifically limit the order of detecting the first expansion units and the second expansion units.

[0165] Step S1420 , controlling the branch between the second target expansion unit and the target current detection module to be turned on.

[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. Fig. 9 Here, taking the second target expansion unit as the second expansion unit 541a as an example, the second designated expansion unit is the second expansion unit 541b, and the target current detection module can be any current detection module among the multiple current detection modules connected to the second expansion unit 541b.

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

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

[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 such as Figure 5 As shown in part (d) of .

[0170] Step S1440 , based on the first current detection signal, determining whether the second target expansion unit is in a normal working state.

[0171] According to the relevant introduction in the hardware embodiment above, the hardware structure of the plurality of second expansion units is the same as the hardware structure of the plurality of first expansion units. Therefore, the relevant introduction about the working state of the second target expansion unit can refer to the relevant description of "working state of the first target expansion unit" in step S1240, which 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 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 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 not difficult to understand here that since the second designated expansion unit is in normal working condition, it means that 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, when the signal parameters of the first current detection signal and the second current detection signal are roughly the same, the control module can determine that the second target expansion unit is in normal working condition. Specifically, step S1440 may include step S1441 and step S1443.

[0173] Step S1441: Acquire a second current detection signal sent by a target current detection module through a second interface to which a second designated extension unit is connected.

[0174] In this embodiment, there is no time sequence in the execution of step S1430 and step S1441, that is, step S1430 and step S1441 can be executed by the control module at the same time, or can be executed by the control module one by one.

[0175] Step S1443 , judging whether the second target expansion unit is in a normal working state based on the first current detection signal and the second current detection signal.

[0176] In this embodiment, the control module can determine whether the second target expansion unit is in a normal working state by comparing the signal parameters of the first current detection signal and the second current detection signal. Specifically, when 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 expansion unit is in a normal working state; conversely, when 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 expansion unit is in an abnormal working state.

[0177] As an implementation manner, the signal parameter may include an AD sampling value of the signal, and step S1443 may include step S1445 and step S1446.

[0178] Step S1445 , obtaining a first sampling value of the first current detection signal and a second sampling value of the second current detection signal.

[0179] As an implementation mode, the control module may be built with an AD sampling module, one end of which is connected to the second port for performing AD sampling on the signal input from the second port. Therefore, the control module may obtain the first sampling value of the first current detection signal and the second sampling value of the second current detection signal through the AD sampling module.

[0180] Step S1446: When the absolute value of the difference between the first sampling value and the second sampling value is less than or equal to the second specified difference, it is determined that the second target expansion unit is in a normal working state.

[0181] In this embodiment, the second specified difference may be a preset value in the control module, or may be adjusted by the R&D personnel based on the specific working conditions of the electrical equipment. Specifically, the second specified difference may be greater than or equal to 0V, and less than or equal to 1V. For example, the second specified difference may be 0.1V, 0.5V, and so on. When the absolute value of the difference between the first sampling value and the second sampling 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 substantially the same, thereby determining that the second target expansion unit is in a normal working state. On the contrary, when the absolute value of the difference between the first sampling value and the second sampling value is greater than the second specified difference, the control module determines that the second target expansion unit is in an abnormal working state.

[0182] As a possible implementation, the control module may generate an alarm message or a fault record when determining that the second target expansion unit is in an abnormal working state. Specifically, the control module may generate an alarm message or a fault record for the description of step S1242, which will not be described in detail here.

[0183] As another implementation, the signal parameter may include a signal frequency, and step S1443 may include step S1447 and step S1448.

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

[0185] In this example, please refer again to Fig. 9 The control module may be built with a comparator, which is used to convert the current detection signal into a PWM signal (i.e., a square wave signal). Since the signal frequency of the PWM signal is the same as the signal frequency of the current detection signal, the control module can determine the signal frequency of the current detection signal by acquiring the signal frequency of the PWM signal.

[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 respectively refer to the relevant introduction of obtaining the first signal frequency of the first pot detection signal in step S1241, which will not be repeated here.

[0187] Step S1448: When 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, it is determined that the second target extension unit is in a normal working state.

[0188] In this embodiment, the third specified difference may be a preset value in the control module, or may be adjusted by the R&D personnel based on the specific working conditions of the electrical equipment. Specifically, the third specified difference may be greater than or equal to 0 Hz, and less than or equal to 15 Hz. For example, the third specified difference may be 5 Hz, 10 Hz, and so on. When 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 substantially the same, thereby determining that the second target expansion unit is in a normal working state. Conversely, when 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 working state.

[0189] In some other possible embodiments, the control module may also determine whether the second target expansion unit is in a normal working state based on the signal parameter of the first current detection signal. Here, the signal parameter is the signal frequency as an example for introduction. Please refer to Figure 5 , when the second target expansion unit is in a normal working state, the signal frequency of the first current detection signal and the signal frequency of the driving pulse signal are the same. Therefore, the control module can determine whether the second target expansion unit is in a normal working state by comparing the magnitudes of the signal frequencies of the two. Specifically, step S1440 may include steps A100 to A300.

[0190] Step A100, obtaining the pulse signal frequency of the driving pulse signal.

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

[0192] Step A200, obtaining a third signal frequency of the first current detection signal.

[0193] Specifically, the implementation method of step A200 can refer to the relevant introduction in step S1447, which will not be repeated here.

[0194] Step A300: When 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, it is determined that the second target expansion unit is in a normal working state.

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

[0196] This embodiment provides a control method for electrical equipment, through which the control module can detect whether multiple second expansion units are in an abnormal working state, and 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 to ensure the normal use of the electrical equipment.

[0197] See also Fig.15 , Fig.15 A control method for an electrical device provided by the fourth embodiment of the present application is schematically shown. In this method, an implementation mode of the control module detecting whether the third expansion unit is faulty is introduced. Specifically, the method includes the following process.

[0198] Step S1510: determine a third target expansion unit.

[0199] In this embodiment, the third target expansion unit is the third expansion unit to be detected. As an implementation mode, the control module may perform fault detection on multiple third expansion units in sequence, and determine the third expansion unit that currently needs to be detected as the third target expansion unit.

[0200] In this embodiment, in response to the detection indication, the control module may first sequentially detect the faults of the plurality of first expansion units, and then sequentially detect the faults of the plurality of third expansion units. Alternatively, the control module may first sequentially detect the faults of the plurality of third expansion units, and then sequentially detect the faults of the plurality of first expansion units. This embodiment does not specifically limit the order of detecting the first expansion units and the third expansion units.

[0201] Step S1520, controlling the branch between the third target expansion unit and the target temperature detection module to be turned on.

[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. Fig.11 Here, taking the third target expansion unit as the third expansion unit 561a as an example, the third designated expansion unit is the third expansion unit 561b, and the target temperature detection module can be any one of the multiple temperature detection modules connected to the third expansion unit 561b.

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

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

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

[0206] According to the relevant introduction in the hardware embodiment above, the hardware structure of the plurality of third expansion units is the same as the hardware structure of the plurality of first expansion units. Therefore, the relevant introduction about the working state of the third target expansion unit can refer to the relevant description of "working state of the first target expansion unit" in step S1240, which 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 may also obtain a second temperature detection signal sent by the target temperature detection module through a third interface connected to the third designated extension unit, and determine whether the third target extension unit is in normal working condition by comparing the first temperature detection signal and the second temperature detection signal. It is not difficult to understand here that since the third designated extension unit is in normal working condition, it means that the second temperature detection signal is a normal temperature detection signal. Therefore, the control module can determine whether the third target extension 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, when the signal parameters of the first temperature detection signal and the second temperature detection signal are roughly the same, the control module can determine that the third target extension unit is in normal working condition. Specifically, step S1540 may include steps S1541 to S1543.

[0208] Step S1541: Acquire a second temperature detection signal sent by a target temperature detection module through a third interface to which a third designated extension unit is connected.

[0209] In this embodiment, there is no time sequence in the execution of step S1530 and step S1541, that is, step S1530 and step S1541 can be executed by the control module at the same time, or can be executed by the control module one by one.

[0210] Step S1542, obtaining a third sampling value of the first temperature detection signal and a fourth sampling value of the second temperature detection signal.

[0211] As an implementation mode, the control module may be built with an AD sampling module, one end of which is connected to the third port for performing AD sampling on the signal input from the third port. Therefore, the control module may obtain the third sampling value of the first temperature detection signal and the fourth sampling value of the second temperature detection signal through the AD sampling module.

[0212] Step S1543: when the absolute value of the difference between the third sampling value and the fourth sampling value is less than or equal to the fourth specified difference, it is determined that the third target expansion unit is in a normal working state.

[0213] In this embodiment, the fourth specified difference may be a preset value in the control module, or may be adjusted by the R&D personnel based on the specific working conditions of the electrical equipment. Specifically, the fourth specified difference may be greater than or equal to 0V, and less than or equal to 1V. For example, the fourth specified difference may be 0.1V, 0.5V, and so on. When the absolute value of the difference between the third sampling value and the fourth sampling value is less than or equal to the fourth specified difference, the control module indicates that the first temperature detection signal and the second temperature detection signal are substantially the same, and further determines that the third target expansion unit is in a normal working state. On the contrary, when the absolute value of the difference between the third sampling value and the fourth sampling value is greater than the fourth specified difference, the control module determines that the third target expansion unit is in an abnormal working state.

[0214] As a possible implementation, the control module may generate an alarm message or a fault record when determining that the third target expansion unit is in an abnormal working state. Specifically, the control module may generate an alarm message or a fault record for the relevant description of the alarm message or / and the fault record, which may be referred to the description in step S1242, and will not be described in detail here.

[0215] In some other possible embodiments, the control module may also determine whether the third target expansion unit is in a normal working state based on the signal parameter of the first temperature detection signal. Here, the signal parameter is an AD sampling value of the signal as an example for introduction. Specifically, step S1540 may include steps B100 to B200.

[0216] Step B100, obtaining a third sampling value of the first temperature detection signal.

[0217] Specifically, the implementation method of step B100 can refer to the relevant introduction in step S1542, which will not be repeated here.

[0218] Step B200: When the third sampling value belongs to a preset sampling interval, it is determined that the third target expansion unit is in a normal working state.

[0219] In this embodiment, the sampling interval represents the range corresponding to the third sampling value when the target temperature detection module and the third target expansion unit are normally connected. For example, when performing hardware testing on electrical equipment, R&D personnel can obtain multiple groups of test data detected by the temperature sampling module, and summarize the above sampling interval based on the multiple groups of test data.

[0220] The control module determines that the third target expansion unit is in a normal working state when the third sampling value belongs to a preset sampling interval. Otherwise, the control module determines that the third target expansion unit is in an abnormal working state when the third sampling value does not belong to the preset sampling interval.

[0221] This embodiment provides a control method for electrical equipment, through which the control module can detect whether multiple third expansion units are in an abnormal working state, and when the third 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 to ensure the normal use of the electrical equipment.

[0222] See also Fig.16 , Fig.16 A control device 1600 of an electrical device provided in an embodiment of the present application is schematically shown, and the device 1600 may include a first determination unit 1610, a first control unit 1620, a first acquisition unit 1630, and a first judgment unit 1640. Among them, the first determination unit 1610 is used to determine the first target expansion unit in response to the detection indication, and the first target expansion unit is the first expansion unit to be detected. The first control unit 1620 is used to control the branch conduction between the first target expansion unit and the target pot detection module; the target pot detection module is connected to the first designated expansion unit connected to the first redundant connection end of the first target expansion unit. The first acquisition unit 1630 is used to obtain 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 judgment unit 1640 is used to determine whether the first target expansion unit is in a normal working state based on the first pot detection signal.

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

[0224] In some possible embodiments, the first judgment unit 1640 is specifically used to obtain a first signal frequency of the first pot detection signal; when the first signal frequency belongs to a preset frequency interval, it is determined that the first target expansion unit is in a normal working state.

[0225] In some possible embodiments, the first control unit 1620 is specifically used to control the first target expansion unit to turn on the branch between the first common connection terminal and the first redundant connection terminal included therein; control the first designated expansion unit to turn on the branch between the first common connection terminal included therein and the first target connection terminal among the multiple first connection terminals, the first target connection terminal being connected to the target pot detection module; 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.

[0226] In some possible embodiments, the device 1600 may also include a second determination unit (not shown in the figure), a second control unit (not shown in the figure), a second acquisition unit (not shown in the figure) and a second judgment unit (not shown in the figure). Among them, the second determination unit is used to determine the second target expansion unit, and the second target expansion unit is the second expansion unit to be detected. The second control unit is used to control the branch conduction between the second target expansion unit and the target current detection module; the target current detection module is connected to the second designated expansion unit connected to the second redundant connection end of the second target expansion unit. The second acquisition unit is used to obtain the first current detection signal sent by the target current detection module through the second interface connected to the second target expansion unit. The second judgment unit is used to determine whether the second target expansion unit is in a normal working state based on the first current detection signal.

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

[0228] In some possible embodiments, the second judgment unit is specifically used to obtain a first sampling value of the first current detection signal and a second sampling value of the second current detection signal; when the absolute value of the difference between the first sampling value and the second sampling value is less than or equal to the second specified difference, it is determined that the second target expansion unit is in a normal working state.

[0229] In some possible embodiments, the second judgment unit is specifically used to obtain a third signal frequency of the first current detection signal and a fourth signal frequency of the second current detection signal; when 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, it is determined that the second target expansion unit is in a normal working state.

[0230] In some possible embodiments, the device 1600 may also include a third determination unit (not shown in the figure), a third control unit (not shown in the figure), a third acquisition unit (not shown in the figure) and a third judgment unit (not shown in the figure). Among them, the third determination unit is used to determine the third target expansion unit, and the third target expansion unit is the third expansion unit to be detected. The third control unit is used to control the branch conduction between the third target expansion unit and the target temperature detection module; the target temperature detection module is connected to the third designated expansion unit connected to the third redundant connection end of the third target expansion unit. The third acquisition unit is used to obtain the first temperature detection signal sent by the target temperature detection module through the third interface connected to the third target expansion unit. The third judgment unit is used to determine whether the third target expansion unit is in a normal working state based on the first temperature detection signal.

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

[0232] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and modules can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

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

[0234] In addition, each functional module in each embodiment of the present application can be integrated into a control module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0235] This embodiment provides a control device for electrical equipment, through which the control module can detect whether multiple first expansion units are in an abnormal working state, and 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 to ensure the normal use of the electrical equipment.

[0236] See also Fig.17 , Fig.17 It is schematically shown that an embodiment of the present application further provides an electrical device 1700, which includes the above-mentioned electromagnetic heating circuit 1710. The specific implementation method of the electromagnetic heating circuit 1710 can refer to the relevant introduction in the above application environment embodiment, 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 applications. The one or more applications are stored in the memory 1712 and configured to be executed by the one or more processors 1711, and the one or more applications are configured to execute the method described in the above embodiment.

[0238] The processor 1711 may include one or more processing cores. The processor 1711 uses various interfaces and lines to connect various parts of the entire battery management system, and executes various functions and processes data of the battery management system by running or executing instructions, programs, code sets or instruction sets stored in the memory 1712, and calling data stored in the memory 1712. Optionally, the processor 1711 can be implemented in at least one hardware form of digital signal processing (DSP), field programmable gate array (FPGA), and programmable logic array (PLA). The processor 1711 can integrate one or more combinations of a central processing unit 1711 (CPU), a graphics processing unit 1711 (GPU), and a modem. Among them, the CPU mainly processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing display content; and the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 1711, but may be implemented separately through a communication chip.

[0239] The memory 1712 may include a random access memory 1712 (RAM) or a read-only memory 1712 (ROM). The memory 1712 may be used to store instructions, programs, codes, code sets or instruction sets. The memory 1712 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (e.g., a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the various method embodiments described above, etc. The data storage area may also store data created by the electronic device during use (e.g., a phone book, audio and video data, chat record data), etc.

[0240] See also Fig.18 , Fig.18 It is schematically shown that an embodiment of the present application further provides a computer-readable storage medium 1800, in which computer program instructions 1810 are stored. The computer program instructions 1810 can be called by a processor to execute the method described in the above embodiment.

[0241] The computer-readable storage medium 1800 may be, for example, a flash memory, an electrically erasable programmable read-only memory (EEPROM), an electrically programmable read-only memory (EPROM), a hard disk, or a read-only memory (ROM). Optionally, the computer-readable storage medium includes a non-transitory computer-readable storage medium. The computer-readable storage medium 1800 has storage space for computer program instructions 1810 for executing any method steps of the above method. These computer program instructions 1810 can be read from one or more computer program products or can be written into one or more computer program products.

[0242] The above are only preferred embodiments of the present application, and are not intended to limit the present application in any form. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present application. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. An electromagnetic heating circuit, characterized in that: include: N resonance modules, where N is an integer greater than 1; Inverter module; N pot detection modules corresponding one to one to the N resonance modules, the pot detection modules being used to detect whether the resonance module is covered by a pot; N switching switches corresponding to the N resonance modules one by one, the switching switches are provided with a first common terminal, a first active terminal, a first position terminal and a second position terminal, the first active terminal is connected to the first common terminal; the first common terminal is connected to the resonance module, the first position terminal is connected to the pot detection module; the second position terminal is connected to the inverter module; A first expansion module includes a plurality of first expansion units, wherein the first expansion units include a first common connection end, a first redundant connection end, and a plurality of first connection ends; the total number of the first connection ends included in the plurality of first expansion units is greater than or equal to the N, and any N first connection ends in the plurality of first expansion units are connected to the N pot detection modules in a one-to-one correspondence; and the first redundant connection end is connected to the first common connection end of a first designated expansion unit in the plurality of first expansion units; as well as The control module is electrically connected to the inverter module and the N switching switches respectively; the control module includes a plurality of first interfaces, and the plurality of first interfaces are connected to the first common connection ends of the plurality of first expansion units in a one-to-one correspondence.

2. The electromagnetic heating circuit according to claim 1, characterized in that: The electromagnetic heating circuit further includes N current detection modules corresponding to the N resonance modules one by one, the current detection modules being connected between the first common end of the switching switch and the resonance module and used to detect current changes in the branch where the current detection modules are located; The electromagnetic heating circuit also includes a second extension module, the second extension module includes a plurality of second extension units, the second extension units include a second common connection end, a second redundant connection end and a plurality of second connection ends; the total number of second connection ends included in the plurality of second extension units is greater than or equal to the N, any N second connection ends in the plurality of second extension units are connected to the N current detection modules in a one-to-one correspondence; the second redundant connection end is connected to the second common connection end of the second designated extension unit in the plurality of second extension units; The control module further includes a plurality of second interfaces, and the plurality of second interfaces are connected to the second common connection ends of the plurality of second expansion units in a one-to-one correspondence.

3. The electromagnetic heating circuit according to claim 2, characterized in that: The current detection module includes a current detection unit and a voltage conversion unit; The input end of the current detection unit is connected between the first common end of the switching switch and the resonance module, and is used to obtain the current signal of the branch where the current detection unit is located; The voltage conversion unit is connected between the output end of the current detection unit and the second connection end, and is used to convert the current signal into a current detection signal.

4. The electromagnetic heating circuit according to claim 3, characterized in that: The output end of the current detection unit includes a first output end and a second output end, and the second output end is grounded; The voltage conversion unit includes a diode, a first resistor and a second resistor; the first resistor is connected between the first output terminal and the second output terminal; The anode of the diode is connected to the first output terminal, and the cathode of the diode is connected to the second connection terminal; One end of the second resistor is connected to the cathode of the diode, and the other end is connected to the second output end.

5. The electromagnetic heating circuit according to claim 1, characterized in that: The electromagnetic heating circuit further includes N temperature detection modules corresponding one-to-one to the N resonance modules, and the temperature detection modules are used to obtain temperature information of the resonance modules; The electromagnetic heating circuit also includes a third extension module, the third extension module includes a plurality of third extension units, the third extension unit includes a third common connection end, a third redundant connection end and a plurality of third connection ends; the total number of third connection ends included in the plurality of third extension units is greater than or equal to the N, and any N third connection ends in the plurality of third extension units are connected to the N temperature detection modules in a one-to-one correspondence; the third redundant connection end is connected to the third common connection end of the third designated extension unit in the plurality of third extension units; The control module further includes 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 in a one-to-one correspondence.

6. A control method for an electrical device, characterized in that: The electrical device comprises the electromagnetic heating circuit according to any one of claims 1 to 5, and the method comprises: In response to the detection indication, determining a first target extension unit, where the first target extension unit is a first extension unit to be detected; Controlling the branch between the first target expansion unit and the target pot detection module to be turned on; the target pot detection module is connected to the first designated expansion unit connected to the first redundant connection end of the first target expansion unit; Acquire a first pot detection signal sent by the target pot detection module through a first interface connected to the first target expansion unit; Based on the first pot detection signal, it is determined whether the first target expansion unit is in a normal working state.

7. The method according to claim 6, characterized in that The determining, based on the first pot detection signal, whether the first target expansion unit is in a normal working state includes: acquiring, through a first interface to which the first designated extension unit is connected, a second pot detection signal sent by the target pot detection module; Acquire a first signal frequency of the first pot detection signal and a second signal frequency of the second pot detection signal; When 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, it is determined that the first target expansion unit is in a normal working state.

8. The method according to claim 6, characterized in that The determining, based on the first pot detection signal, whether the first target expansion unit is in a normal working state includes: Acquire a first signal frequency of the first pot detection signal; When the first signal frequency belongs to a preset frequency interval, it is determined that the first target expansion unit is in a normal working state.

9. The method according to claim 6, characterized in that The controlling the branch circuit between the first target expansion unit and the target pot detection module to be turned on includes: Controlling the first target expansion unit to conduct a branch between a first common connection terminal and a first redundant connection terminal included in the first target expansion unit; Control the first designated extension unit to conduct a branch between a first common connection terminal and a first target connection terminal among the plurality of first connection terminals, wherein the first target connection terminal is connected to the target pot detection module; The switching switch corresponding to the target pot detection module is controlled to switch on a branch between the first common terminal and the first position terminal.

10. The method according to claim 6, characterized in that The method further comprises: Determine a second target extension unit, where the second target extension unit is a second extension unit to be detected; Controlling the branch between the second target expansion unit and the target current detection module to be turned on; the target current detection module is connected to the second designated expansion unit connected to the second redundant connection end of the second target expansion unit; Acquire a first current detection signal sent by the target current detection module through a second interface connected to the second target expansion unit; Based on the first current detection signal, it is determined whether the second target expansion unit is in a normal working state.

11. The method according to claim 10, characterized in that The determining, based on the first current detection signal, whether the second target expansion unit is in a normal working state includes: Acquire a second current detection signal sent by the target current detection module through a second interface connected to the second designated extension unit; Based on the first current detection signal and the second current detection signal, it is determined whether the second target expansion unit is in a normal working state.

12. The method according to claim 11, characterized in that The determining, based on the first current detection signal and the second current detection signal, whether the second target expansion unit is in a normal working state includes: Obtaining a first sampling value of the first current detection signal and a second sampling value of the second current detection signal; and determining that the second target expansion unit is in a normal working state when 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; or Obtain a third signal frequency of the first current detection signal and a fourth signal frequency of the second current detection signal; when 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, determine that the second target expansion unit is in a normal working state.

13. The method according to claim 6, characterized in that The method further comprises: Determine a third target extension unit, where the third target extension unit is a third extension unit to be detected; Controlling the branch between the third target expansion unit and the target temperature detection module to be conductive; the target temperature detection module is connected to the third designated expansion unit connected to the third redundant connection end of the third target expansion unit; Acquire a first temperature detection signal sent by the target temperature detection module through a third interface connected to the third target expansion unit; Based on the first temperature detection signal, it is determined whether the third target expansion unit is in a normal working state.

14. The method according to claim 13, characterized in that The determining, based on the first temperature detection signal, whether the third target expansion unit is in a normal working state includes: Acquire a second temperature detection signal sent by the target temperature detection module through a third interface connected to 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; When the absolute value of the difference between the third sampling value and the fourth sampling value is less than or equal to the fourth specified difference, it is determined that the third target expansion unit is in a normal working state.

15. A control device for an electrical device, characterized in that: The electrical equipment comprises the electromagnetic heating circuit according to any one of claims 1 to 5, and the device comprises: A first determining unit, configured to determine a first target extension unit in response to a detection indication, wherein the first target extension unit is a first extension unit to be detected; a first control unit, configured to control the conduction of a branch between the first target expansion unit and a target pot detection module; the target pot detection module is connected to a first designated expansion unit connected to a first redundant connection end of the first target expansion unit; a first acquiring unit, configured to acquire, through a first interface to which the first target expansion unit is connected, a first pot detection signal sent by the target pot detection module; The first judging unit is configured to judge whether the first target expansion unit is in a normal working state based on the first pot detection signal.

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

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