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, N fling-cut switches, an input expansion module, an output expansion module and a control module. The input expansion module comprises a first input expansion unit provided with N first input expansion ends, and the N first input expansion ends are connected to the N pot detection modules in a one-to-one correspondence mode. The output expansion module comprises a first output expansion unit provided with N first output expansion ends, and the N first output expansion ends are connected to the N fling-cut switches in a one-to-one correspondence mode. The control module is electrically connected with the inversion module, the first input expansion unit and the first output expansion unit. Input expansion of the control module can be realized by setting the first input expansion unit, and output expansion of the control module can be realized by setting the first output expansion unit, so that interface resources of the control module are saved.

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 existing control chips 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 a 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, an input extension module, an output extension module, and a control module, where N is an integer greater than 1. Among them, the inverter module is used to supply power to the N resonance modules. 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, and 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; and the second position terminal is connected to the inverter module. The input extension module includes a first input extension unit, the first input extension unit is provided with a first output terminal and N first input extension terminals, and the N first input extension terminals are connected to the N pot detection modules in a one-to-one correspondence. The output extension module includes a first output extension unit, the first output extension unit is provided with a first input terminal and N first output extension terminals, and the N first output extension terminals are connected to the N switching switches in a one-to-one correspondence. The control module is electrically connected to the inverter module, the first output end of the first input expansion unit, and the first input end of the first output expansion unit respectively.

[0007] In the second aspect, some embodiments of the present application also provide a control method for an electrical device, which includes the above-mentioned electromagnetic heating circuit, and the method includes: obtaining a first input signal from a first input expansion unit, the first input signal is determined based on N pot detection signals output by N pot detection modules; determining a first resonant module based on the first input signal, the first resonant module represents a resonant module covered by the pot among the N pot detection modules; sending a first output signal to an output expansion module, the output expansion module controls the first switching switch to close the branch between the first resonant module and the inverter module based on the first output signal; and sending a drive pulse signal to the inverter module.

[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 an acquisition unit, a determination unit, a first sending unit, and a second sending unit. Among them, the acquisition unit is used to acquire a first input signal from the first input expansion unit, and the first input signal is determined based on N pot detection signals output by N pot detection modules. The determination unit is used to determine the first resonance module based on the first input signal, and the first resonance module represents the resonance module covered by the pot among the N pot detection modules. The first sending unit is used to send a first output signal to the output expansion module, and the output expansion module controls the first switching switch to close the branch between the first resonance module and the inverter module based on the first output signal. The second sending unit is used to send a drive pulse signal to the inverter module.

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

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

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

[0012] The present application provides an electromagnetic heating circuit, a control method and device for electrical equipment, 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, an input expansion module, an output expansion module, and a control module.

[0013] On the one hand, since the first input extension unit is connected between the control module and the N pot detection modules, specifically, the N first input extension terminals of the first input extension unit are connected to the N pot detection modules in a one-to-one correspondence, and the first output terminal of the first input extension unit is connected to the control module, so that the N pot detection signals output by the N pot detection modules can be input to the control module as one first input signal. Therefore, the control module only needs to set one signal port to obtain the N pot detection signals.

[0014] On the other hand, since the first output expansion unit is connected between the control module and the N switching switches, specifically, the N first output expansion terminals of the first output expansion unit are connected to the N switching switches in a one-to-one correspondence, and the first input terminal of the first output expansion unit is connected to the control module. The control module can control the N switching switches by sending an output signal to the first output expansion unit, so that the control module only needs to set one signal port to control the N switching switches.

[0015] Therefore, the electromagnetic heating circuit in the present application can achieve input expansion of the control module by setting a first input expansion unit, and can achieve output expansion of the control module by setting a first output expansion unit, thereby saving interface resources of the control module and reducing the difficulty of chip selection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 It is a structural schematic diagram of an electrical device provided in an embodiment of the present application.

[0018] Figure 2 yes Figure 1 Schematic diagram of the electromagnetic heating circuit.

[0019] Figure 3 yes Figure 2 Schematic diagram of the structure of the inverter unit.

[0020] Figure 4 yes Figure 2 Schematic diagram of the signal waveform corresponding to the electromagnetic heating circuit shown.

[0021] Figure 5 yes Figure 2 Schematic diagram of the structure of the resonance module.

[0022] Figure 6 yes Figure 2 Schematic diagram of the structure of the central inspection pot module.

[0023] Figure 7 yes Figure 2 Schematic diagram of the structure of the current detection module.

[0024] Figure 8 yes Figure 2 Schematic diagram of the structure of the temperature detection module.

[0025] Fig. 9 yes Figure 2 A structural diagram of the input expansion module, output expansion module and control module.

[0026] Fig.10 yes Figure 2 Another structural diagram of the input expansion module, the output expansion module and the control module.

[0027] Fig.11 It is a flowchart of a control method for electrical equipment provided in the first embodiment of the present application.

[0028] Fig.12 It is a flow chart of a control method of an electrical device provided in the second embodiment of the present application.

[0029] Fig.13 It is a flow chart of a control method of an electrical device provided in the third embodiment of the present application.

[0030] Fig.14 It is a flowchart of a control method for electrical equipment provided in the fourth embodiment of the present application.

[0031] Fig.15 It is a flowchart of a control method for electrical equipment provided in the fifth embodiment of the present application.

[0032] Fig.16 It is a module block diagram of a control device for an electrical device provided in an embodiment of the present application.

[0033] Fig.17 It is a module block diagram of the electrical equipment provided in the embodiment of the present application.

[0034] Fig.18 It is a module block diagram of the computer-readable storage medium provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0036] 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.

[0037] The present application provides an electromagnetic heating circuit, a control method and device for electrical equipment, 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, an input expansion module, an output expansion module, and a control module.

[0038] On the one hand, since the first input extension unit is connected between the control module and the N pot detection modules, specifically, the N first input extension terminals of the first input extension unit are connected to the N pot detection modules in a one-to-one correspondence, and the first output terminal of the first input extension unit is connected to the control module, so that the N pot detection signals output by the N pot detection modules can be input to the control module as one first input signal. Therefore, the control module only needs to set one signal port to obtain the N pot detection signals.

[0039] On the other hand, since the first output expansion unit is connected between the control module and the N switching switches, specifically, the N first output expansion terminals of the first output expansion unit are connected to the N switching switches in a one-to-one correspondence, and the first input terminal of the first output expansion unit is connected to the control module. The control module can control the N switching switches by sending an output signal to the first output expansion unit, so that the control module only needs to set one signal port to control the N switching switches.

[0040] Therefore, the electromagnetic heating circuit in the present application can achieve input expansion of the control module by setting a first input expansion unit, and can achieve output expansion of the control module by setting a first output expansion unit, thereby saving interface resources of the control module and reducing the difficulty of chip selection.

[0041] In order to facilitate the detailed description of the present application, the application environment of the embodiment of the present application is first introduced in conjunction with the accompanying drawings. The embodiment of the present application provides an electromagnetic heating circuit 100 and an electrical device 200 equipped with the electromagnetic heating circuit 100. Among them, the electrical device 200 is a device that heats a pot placed above the electrical device 200 based on the electromagnetic induction phenomenon. For example, the electrical device 200 can be a full-area multi-burner stove, an induction cooker, etc.

[0042] See also Figure 1 The electrical device 200 may include a housing 210, a function panel 230, and an electromagnetic heating circuit 100, and the electromagnetic heating circuit 100 may include a plurality of coils 250. The function panel 230 is disposed on the outer surface of the housing 210, and is used to receive control operations of the user. The electromagnetic heating circuit 100 is disposed inside the housing 210, and the electromagnetic heating circuit 100 and the function panel 230 are electrically connected, and are used to work according to the control operations received by the function panel 230 (for example, controlling one or more coils 250 in the electromagnetic heating circuit 100 to heat). For example, the above-mentioned control operations may include a start operation, a timing operation, a heating mode selection operation, and the like.

[0043] 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.

[0044] 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.

[0045] The coil 250 is used to generate an alternating magnetic field with a continuously changing direction under the excitation of an alternating current, so that an eddy current is generated in a metal conductor (for example, a pot placed on the electrical device 200) in the alternating magnetic field, and then the metal conductor is heated up under the action of the eddy current to cook the food placed inside it.

[0046] 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.

[0047] The electromagnetic heating circuit 100 is used to control the coil 250 to work. Specifically, there may be multiple electromagnetic heating circuits 100, and the multiple electromagnetic heating circuits 100 are used to control some of the coils 250 in the multiple coils 250 respectively. Figure 1 In the embodiment shown, there are two electromagnetic heating circuits 100, each of which is used to control 25 coils. Specifically, one electromagnetic heating circuit 100 controls coils No. 1 to No. 25, and the other electromagnetic heating circuit 100 controls coils No. 26 to No. 50.

[0048] See also Figure 2The 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, an input expansion module 50, an output expansion module 60, and a control module 70, where N is an integer greater than 1. The inverter module 10 is used to supply power to the N resonance modules 20. The pot detection module 30 is used to detect whether the resonance module 20 is covered by a pot. The switching switch 40 is 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. The input extension module 50 may include a first input extension unit 520, the first input extension unit 520 is provided with a first output terminal 5210 and N first input extension terminals 5230, and the N first input extension terminals 5230 are connected to the N pot detection modules 30 in a one-to-one correspondence. The output extension module 60 may include a first output extension unit 610, the first output extension unit 610 is provided with a first input terminal 6120 and N first output extension terminals 6140, and the N first output extension terminals 6140 are connected to the N switching switches 40 in a one-to-one correspondence. The control module 70 is electrically connected to the inverter module 10, the first output terminal 5210 of the first input extension unit 520, and the first input terminal 6120 of the first output extension unit 610, respectively.

[0049] On the one hand, since the first input expansion unit 520 is connected between the control module 70 and the N pot detection modules 30, specifically, the N first input expansion terminals 5230 of the first input expansion unit 520 are connected to the N pot detection modules 20 in a one-to-one correspondence, and the first output terminal 5210 of the first input expansion unit 520 is connected to the control module 70, so that the N pot detection signals output by the N pot detection modules 20 can be input to the control module 70 as one first input signal. Therefore, the control module 70 only needs to set one signal port to obtain the N pot detection signals.

[0050] On the other hand, since the first output expansion unit 610 is connected between the control module 70 and the N switching switches 40, specifically, the N first output expansion terminals 6140 of the first output expansion unit 610 are connected to the N switching switches 40 in a one-to-one correspondence, and the first input terminal 6120 of the first output expansion unit 610 is connected to the control module 70. The control module 70 can control the N switching switches 40 by sending an output signal to the first output expansion unit 610, so that the control module 70 only needs to set one signal port to control the N switching switches 40.

[0051] Therefore, the electromagnetic heating circuit 100 in the present application can achieve input expansion of the control module 70 by setting a first input expansion unit 520, and can achieve output expansion of the control module 70 by setting a first output expansion unit 610, thereby saving interface resources of the control module 70 and reducing the difficulty of chip selection.

[0052] The specific implementation of each module in the electromagnetic heating circuit 100 is introduced below.

[0053] 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.

[0054] 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).

[0055] 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 3The 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 4 , Figure 4 Part (a) is the waveform curve of the first pulse signal PWM_H. Figure 4 Part (b) is the waveform curve of the second pulse signal PWM_L.

[0056] Please refer again Figure 3 , 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 third power supply terminal 21, the control end 12 of the first switch tube Q1 is connected to the first signal terminal 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 terminal 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 third power supply terminal 21 is used to provide a DC voltage VBUS, and the DC voltage VBUS can be a voltage after the mains voltage is rectified by a rectifier circuit, that is, the amplitude of the DC voltage VBUS can be 220V.

[0057] 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.

[0058] In this embodiment, the electromagnetic heating circuit 100 may also 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 turn on the branch between one of the inverter units 120 and the resonance module 20.

[0059] 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 .

[0060] 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.

[0061] In this embodiment, the resonance module 20 is used to generate an alternating magnetic field under the excitation of an alternating current. Figure 5 , the resonance module 20 may include a coil LX, a first resonance capacitor CX1 and a second resonance capacitor CX2. Among them, one end of the first resonance capacitor CX1 and the second resonance capacitor CX2 connected in series is connected to the third power supply terminal 21, and the other end is grounded. The first end 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 first common end of the first resonance capacitor CX1 and the second resonance 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 resonance capacitor CX2 resonate; when the second switch tube Q2 in the inverter unit 120 is turned on, the coil LX and the first resonance capacitor CX1 resonate.

[0062] 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.

[0063] 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 .

[0064] 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.

[0065] 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.

[0066] 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 6 The pot detection module 30 may include an oscillation unit 310 , a voltage pull-up unit 330 and a signal comparison unit 350 .

[0067] 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 .

[0068] 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 first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, 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 first power supply terminal 23 through the first resistor R1, and is grounded through the second resistor R2. The first terminal 33 of the transistor Q3 is connected to the detection terminal 3100, and is connected to the first power supply terminal 23 through the third resistor R3. The second terminal 35 of the transistor Q3 is grounded through the fourth resistor R4. Among them, the first power supply terminal 23 is used to provide a first power supply voltage VDD1, and the first power supply voltage VDD1 is a DC voltage. For example, the amplitude of the first power supply voltage VDD1 can be 2.5V, 3V, etc.

[0069] 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 first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are current limiting resistors, respectively, wherein the first resistor R1 and the second resistor R2 are used to limit the base current of the BJT tube, the third resistor R3 is used to limit the collector current of the BJT tube, and the fourth resistor R4 is used to limit the emitter current of the BJT tube.

[0070] 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 fourth resistor R4 are connected in parallel, and the third capacitor C3 and the second resistor R2 are connected in parallel. One end of the fourth capacitor C4 and the inductor L connected in series is connected 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.

[0071] 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.

[0072]

[0073] 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.

[0074] 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 fifth resistor R5 and a sixth resistor R6, wherein the fifth resistor R5 is connected between the first power supply terminal 23 and the positive phase input terminal 3501, and one end of the sixth resistor R6 is connected to the positive phase input terminal 3501, and the other end is grounded. The fifth resistor R5 and the sixth resistor R6 are respectively voltage-dividing resistors, which are used to divide the first power supply voltage VDD1 input from the first 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 divided VDD1 and the detection signal.

[0075] In some possible embodiments, the voltage pull-up unit 330 may further include a fifth capacitor C5, one end of the fifth capacitor C5 is connected to the detection end 3100 of the oscillation unit 310, and the other end 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 VDD1 input by the transistor Q3 in the oscillation unit 310 to prevent the first power supply voltage VDD1 from affecting the signal input of the signal comparison unit 350.

[0076] The inverting input terminal 3503 of the signal comparison unit 350 is used to input a reference voltage Vref, and the output terminal 3505 of the signal comparison unit 350 is connected to the control module 70, and 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 seventh resistor R7 and a sixth capacitor C6.

[0077] 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 reference voltage Vref, and the output terminal 3505 of the voltage comparator 3500 is connected to the control module 70. Specifically, the reference voltage Vref can be determined based on the voltage value after the first power supply voltage VDD1 is divided by the fifth resistor R5 and the sixth resistor R6, 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.

[0078] The seventh resistor R7 is connected between the first power supply terminal 23 and the output terminal 3505 of the voltage comparator 3500. The seventh resistor R7 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.

[0079] 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.

[0080] 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.

[0081] See also Figure 7 The current detection module 50 may include a current detection unit 520, a voltage conversion unit 540 and a voltage comparison unit 560. The input terminal 5200 of the current detection unit 520 is connected between the 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 resonance module 20 is located.

[0082] The input end 5200 of the current detection unit 520 may include a first input end 5201 and a second input end 5203, wherein the first input end 5201 is connected to the 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 resonance module 20 is located. Please refer to Figure 4 , Figure 4 Part (c) in the figure is the waveform diagram corresponding to the current signal. It is not difficult to see from the current waveform diagram that the current in the branch where the resonance module 20 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.

[0083] 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 5223, and the first output terminal 5221 is connected to the first power supply terminal 23. The first power supply terminal 23 is used to provide a first power supply voltage VDD1, and the first power supply voltage VDD1 is a DC voltage. For example, the amplitude of the first power supply voltage VDD1 can be 2.5V, 3V, etc.

[0084] The voltage conversion unit 540 is connected between the output terminal 5220 of the current detection unit 520 and the positive phase input terminal 5600 of the voltage comparison unit 560, and is used to convert the current signal output by the current detection unit 520 into a voltage signal. Specifically, the voltage conversion unit 540 may include an eighth resistor R8 and a ninth resistor R9. Among them, the eighth resistor R8 is connected between the first output terminal 5221 and the second output terminal 5223, and the eighth resistor R8 can convert the current signal output by the current detection unit 520 into a voltage signal across the eighth resistor R8, and then under the action of the first power supply voltage VDD1 input at the first output terminal 5221, the input voltage at the positive phase input terminal 5600 of the voltage comparison unit 560 is the superposition voltage of the first power supply voltage VDD1 and the voltage across the eighth resistor R8. The ninth resistor R9 is connected between the second output terminal 5223 and the positive phase input terminal 5600 of the voltage comparison unit 560, and the ninth resistor R9 can play a current limiting role to prevent the current at the positive phase input terminal of the voltage comparison unit 560 from being too large.

[0085] Please refer again Figure 4 , Figure 4 Part (d) in the figure is a waveform diagram of the input voltage of the positive phase input terminal 5600 of the voltage comparison unit 560. Since the eighth resistor R8 is a pure resistive load, the change trend of the voltage on both sides of the eighth resistor R8 is consistent with the change trend of the current of the branch where the resonance module 20 is located. In addition, under the action of the first power supply voltage VDD1, the voltage on both sides of the eighth resistor R8 is pulled up as a whole by the voltage value corresponding to the first power supply voltage VDD1 and then input to the positive phase input terminal 5600. Specifically, when the current amplitude of the branch where the resonance module 20 is located is greater than 0, the amplitude of the input voltage of the positive phase input terminal 5600 is greater than VDD1; when the current amplitude of the branch where the resonance module 20 is located is less than 0, the amplitude of the input voltage of the positive phase input terminal 5600 is less than VDD1.

[0086] In this embodiment, the voltage conversion unit 540 may further include a tenth resistor R10, one end of the tenth resistor R10 is connected to the non-inverting input terminal 5600 of the voltage comparison unit 560, and the other end of the tenth resistor R10 is connected to the second power supply terminal 25, and the second power supply voltage VDD2 output by the second power supply terminal 25 is greater than the power supply voltage VDD1 output by the first power supply terminal 23. Specifically, the second power supply voltage VDD2 is a DC voltage, for example, the amplitude of the second power supply voltage VDD2 can be 5V, 6.5V, etc. In this embodiment, by setting the tenth resistor R10 at the non-inverting input terminal 5600, and the second power supply voltage VDD2 input by the tenth resistor R10 is greater than the power supply voltage VDD1, it can be ensured that the input voltage of the non-inverting input terminal 5600 is always greater than 0, thereby ensuring the working stability of the voltage comparison unit 560.

[0087] The inverting input terminal 5620 of the voltage comparison unit 560 is connected to the first power supply terminal 23, so the input voltage of the inverting input terminal 5620 is the first power supply voltage VDD1. The output terminal 5640 of the voltage comparison unit 560 is connected to the control module 70, which is used to output a current detection signal to the control module 70. Specifically, the voltage comparison unit 560 can be a voltage comparator, which is used to compare the voltage between the positive input terminal 5600 and the inverting input terminal 5620. When the input voltage of the positive input terminal 5600 is greater than the input voltage of the inverting input terminal 5620, the output terminal 5640 of the voltage comparator can output a high level signal; when the input voltage of the positive input terminal 5600 is less than the input voltage of the inverting input terminal 5620, the output terminal 5640 of the voltage comparator can output a low level signal. Please refer again Figure 4 , Figure 4 Part (e) is a waveform diagram of the output signal (ie, the current detection signal) of the output terminal 5640 , and the waveform of the output signal is a square wave.

[0088] Therefore, in this embodiment, the current signal of the branch where the resonance module 20 is located can be converted into a square wave signal (that is, a current detection signal) by setting the current detection module 50. When the amplitude of the current signal is greater than 0, the square wave signal is at a high level, and when the amplitude of the current signal is less than 0, the square wave signal is at a low level.

[0089] It should be noted that, since the coil LX in the resonance module 20 is an inductive load, the current signal of the branch where the resonance module 20 is located will lag behind the driving pulse signal. Figure 4It is not difficult to see that when the first pulse signal PWM_H changes from a low level to a high level, the current signal of the branch where the resonance module 20 is located does not change from a negative value to a positive value synchronously, but changes to a positive value after a delay of a period of time t1, so that the output signal of the output terminal 5640 of the voltage comparison unit 560 also changes from a low level to a high level after a delay of a period of time t1.

[0090] In some possible embodiments, the current detection module 50 may further include an eleventh resistor R11, one end of the eleventh resistor R11 is connected to the output end 5640 of the voltage comparison unit 560, and the other end of the eleventh resistor R11 is connected to the first power supply end 23. The eleventh resistor R11 in this embodiment is an output pull-up resistor, which is used to ensure the normal output of the current detection signal.

[0091] In some possible embodiments, the current detection module 50 may further include an eighth capacitor C8, which is connected between the positive input terminal 5600 and the negative input terminal 5620 of the voltage comparison unit 560. The eighth capacitor C8 can filter the instantaneously changing voltage to avoid misjudgment of the voltage comparison unit 560 when the input voltage of the positive input terminal 5600 or the input voltage of the negative input terminal 5620 suddenly changes, thereby ensuring the normal output of the current detection signal.

[0092] In this embodiment, 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. Among them, the temperature detection module 90 may be provided with a temperature detection terminal 92, and the temperature detection terminal 92 is connected to the control module 70, which is used to output a temperature detection signal to the control module 70, and the temperature detection signal is used to characterize the temperature of the space where the resonance module 20 is located.

[0093] See also Figure 8 The temperature detection module 90 may include a thermistor Rt, a twelfth resistor R12 and a ninth capacitor C9, wherein one end of the thermistor Rt is connected to one end of the twelfth resistor R12 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 twelfth resistor R12 is connected to the first power supply end 23. Therefore, the temperature detection signal output by the temperature detection end 92 is a voltage signal obtained by dividing the power supply voltage VDD1 by the thermistor Rt and the twelfth resistor R12. 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.

[0094] One end of the ninth capacitor C9 is connected to the temperature detection end 92, and the other end is grounded. The ninth capacitor C9 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.

[0095] In this embodiment, the input expansion module 50 is used to implement the signal input expansion of the control module 70. In this embodiment, please refer to Figure 2 and Fig. 9 The input expansion module 50 may include a first input expansion unit 520, the first input expansion unit 520 is provided with a first output terminal 5210 and N first input expansion terminals 5230, and the N first input expansion terminals 5230 are connected to the N pot detection modules 30 in a one-to-one correspondence. Among them, the first input expansion terminal 5230 is connected to the output terminal 3505 of the signal comparison unit 350 in the pot detection module 30, and the first output terminal 5210 is connected to the control module 70. Therefore, the first input expansion unit 520 can realize the input expansion of the control module 70 to the N-way pot detection signal.

[0096] Specifically, the first input expansion unit 520 may include one or more multi-way selection switches, the first input expansion terminal 5230 is the selection terminal of the multi-way selection switch, and the first output 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 this embodiment does not specifically limit it. Here, N is 25 as an example for explanation. The multi-way selection switch can be an eight-to-one analog switch. For example, the model of the eight-to-one analog switch can be CD4051. Therefore, the first input expansion unit 520 needs to set four eight-to-one analog switches connected in parallel to each other to realize the extended input of the 25 pot detection signals output by the 25 pot detection modules 30.

[0097] In this embodiment, the first input expansion unit 520 may also be provided with a first control terminal 5250, and the control module 70 is electrically connected to the first control terminal 5250. Specifically, the first control terminal 5250 may be a control signal terminal of a multi-way selection switch, and the first control terminal 5250 is used to receive a control signal sent by the control module 70, so that the multi-way selection switch conducts a branch between a designated selection terminal and a common terminal under the action of the control signal.

[0098] It is not difficult to understand here that, in the case where the first input expansion unit 520 includes a plurality of multi-way selection switches, the number of the first output terminal 5210 and the first control terminal 5250 is also multiple, and the multiple first output terminals 5210 and the multiple first control terminals 5250 are connected to the control module 70. Therefore, in this embodiment, by setting the first input expansion unit 520, the control module 70 can implement the extended input of N-way pot detection signals, thereby saving the interface resources of the control module 70 and reducing the difficulty of chip selection.

[0099] In some possible embodiments, when the electromagnetic heating circuit 100 includes N current detection modules 50, the input expansion module 50 may further include a second input expansion unit 540, the second input expansion unit 540 is provided with a second output terminal 5410, a second control terminal 5450 and N second input expansion terminals 5430, and the N second input expansion terminals 5430 are connected to the N current detection modules 50 in a one-to-one correspondence. Among them, the second input expansion terminal 5430 is connected to the output terminal 5640 of the voltage comparison unit 560 in the current detection module 50, and the second output terminal 5410 and the second control terminal 5450 are respectively connected to the control module 70. Therefore, the second input expansion unit 540 can realize the input expansion of the control module 70 for the N-way current detection signal.

[0100] Specifically, the second input expansion unit 540 may include one or more multi-way selection switches, the second input expansion terminal 5430 is the selection terminal of the multi-way selection switch, the second output terminal 5410 is the common terminal of the multi-way selection switch, and the second control terminal 5450 is the control signal terminal of the multi-way selection switch. The second control terminal 5450 is used to receive the control signal sent by the control module 70, so that the multi-way selection switch conducts the branch between the specified selection terminal and the common terminal under the action of the control signal. The model and number of the multi-way selection switch can be determined according to the number of current detection modules 50, and this embodiment is not specifically limited. Here, N is 25 as an example for explanation. The multi-way selection switch can be an eight-to-one analog switch. For example, the model of the eight-to-one analog switch can be CD4051. Therefore, the second input expansion unit 540 needs to set four eight-to-one analog switches connected in parallel to each other to realize the extended input of 25 current detection signals output by 25 current detection modules 50.

[0101] It is not difficult to understand here that, in the case where the second input expansion unit 540 includes a plurality of multi-way selection switches, the number of the second output terminal 5410 and the second control terminal 5450 is also multiple, and the multiple second output terminals 5410 and the multiple second control terminals 5450 are connected to the control module 70. Therefore, in this embodiment, by setting the second input expansion unit 540, the control module 70 can implement the extended input of N-way current detection signals, thereby saving the interface resources of the control module 70 and reducing the difficulty of chip selection.

[0102] In some possible embodiments, when the electromagnetic heating circuit 100 includes N temperature detection modules 90, the input expansion module 50 may further include a third input expansion unit 560, the third input expansion unit 560 is provided with a third output terminal 5610, a third control terminal 5650 and N third input expansion terminals 5630, and the N third input expansion terminals 5630 are connected to the N temperature detection modules 90 in a one-to-one correspondence. Among them, the third input expansion terminal 5630 is connected to the temperature detection terminal 92 of the temperature detection module 90, and the third output terminal 5610 and the third control terminal 5650 are respectively connected to the control module 70. Therefore, the third input expansion unit 560 can realize the input expansion of the control module 70 to the N-channel temperature detection signal.

[0103] Specifically, the third input expansion unit 560 may include one or more multi-way selection switches, the third input expansion terminal 5630 is the selection terminal of the multi-way selection switch, the third output terminal 5610 is the common terminal of the multi-way selection switch, and the third control terminal 5650 is the control signal terminal of the multi-way selection switch. The third control terminal 5650 is used to receive the control signal sent by the control module 70, so that the multi-way selection switch conducts the branch between the specified selection terminal and the common terminal under the action of the control signal. The model and number of the multi-way selection switch can be determined according to the number of temperature detection modules 90, and this embodiment is not specifically limited. Here, N is 25 as an example for explanation. The multi-way selection switch can be an eight-to-one analog switch. For example, the model of the eight-to-one analog switch can be CD4051. Therefore, the third input expansion unit 560 needs to set four eight-to-one analog switches connected in parallel to each other to realize the extended input of 25 temperature detection signals output by 25 temperature detection modules 90.

[0104] It is not difficult to understand here that, when the third input expansion unit 560 includes a plurality of multi-way selection switches, the number of the third output terminal 5610 and the third control terminal 5650 is also multiple, and the multiple third output terminals 5610 and the multiple third control terminals 5650 are connected to the control module 70. Therefore, this embodiment can realize that the control module 70 extends the input of N-way temperature detection signals by setting the third input expansion unit 560, thereby saving the interface resources of the control module 70 and reducing the difficulty of chip selection.

[0105] In this embodiment, the output expansion module 60 is used to implement signal output expansion of the control module 70. In this embodiment, the output expansion module 60 may include a first output expansion unit 610, the first output expansion unit 610 is provided with a first input terminal 6120 and N first output expansion terminals 6140, the N first output expansion terminals 6140 are connected to the N switching switches 40 in a one-to-one correspondence, and the first input terminal 6120 is connected to the control module 70. Therefore, the first output expansion unit 610 can implement the output control of the control module 70 on the N switching switches 40.

[0106] Specifically, the first output expansion unit 610 may include one or more serial-to-parallel output chips, which may convert one output signal sent by the control module 70 into multiple signal outputs to achieve output control of N switching switches 40. Among them, the first input terminal 6120 is the parallel port of the serial-to-parallel output chip, and the N first output expansion terminals 6140 are the serial ports of the serial-to-parallel output chip. Exemplarily, the model of the serial-to-parallel output chip may be 74HC595. Here, taking N as 25 as an example, the first output expansion unit 610 needs to be provided with four serial-to-parallel output chips to achieve output control of 25 switching switches 40.

[0107] In some possible embodiments, when the electromagnetic heating circuit 100 includes N source selection switches 80, the output expansion module 60 may further include a second output expansion unit 630, the second output expansion unit 630 is provided with a second input terminal 6320 and N second output expansion terminals 6340, the second input terminal 6320 is connected to the control module 70, and the N second output expansion terminals 6340 are connected to the N source selection switches 80 in a one-to-one correspondence. Therefore, the second output expansion unit 630 can realize the output control of the control module 70 on the N source selection switches 80.

[0108] Specifically, the second output expansion unit 630 may include one or more serial-to-parallel output chips, which may convert one output signal sent by the control module 70 into multiple signal outputs to achieve output control of N source selection switches 80. Among them, the second input terminal 6320 is the parallel port of the serial-to-parallel output chip, and the N second output expansion terminals 6340 are the serial port of the serial-to-parallel output chip. Exemplarily, the model of the serial-to-parallel output chip may be 74HC595. Here, taking N as 25 as an example, the second output expansion unit 630 needs to be provided with four serial-to-parallel output chips to achieve output control of 25 source selection switches 80.

[0109] It should be noted here that when there are multiple serial-to-parallel output chips in the first output expansion unit 610 and the second output expansion unit 630, the multiple serial-to-parallel output chips are connected in a cascade manner, so that the control module 70 only needs to output one signal to realize the signal output of multiple serial-to-parallel output chips, thereby saving port resources of the control module 70.

[0110] Similarly, the first output expansion unit 610 and the second output expansion unit 630 are cascaded, and the first input terminal 6120 of the first output expansion unit 610 and the second input terminal 6320 of the second output expansion unit 630 are connected to form a common connection terminal 61, and the common connection terminal 61 is connected to the control module 70. It is not difficult to understand here that the serial-to-parallel output chip included in the first output expansion unit 610 and the serial-to-parallel output chip included in the second output expansion unit 630 are cascaded in sequence, so that the control module 70 only needs to output one signal to realize the output control of the N switching switches 40 and the N source selection switches 80, saving the port resources of the control module 70.

[0111] In some possible embodiments, see Fig.10 The output expansion module 60 may also be provided with an output control unit 650, and the output control unit 650 is cascaded with the first output expansion unit 610. The output control unit 650 may include a control input terminal 6520 and a control output terminal 6540, and the control input terminal 6520 is connected to the control module 70. For example, the control input terminal 6520 may be connected to the common connection terminal 61 mentioned above. The control output terminal 6540 is connected to the first control terminal 5250 of the first input expansion unit 520. That is, the control module 70 sends a control signal to the first input expansion unit 520 in the input expansion module 50 through the output control unit 650.

[0112] Specifically, the output control unit 650 may include one or more serial-to-parallel output chips. The serial-to-parallel output chip included in the output control unit 650 and the serial-to-parallel output chip included in the first output expansion unit 610 are cascaded in sequence, so that the control module 70 only needs to output one signal. This signal can not only realize the output control of N switching switches 40 and N source selection switches 80, but also realize the output control of the first input expansion unit 520, which can further save the port resources of the control module 70.

[0113] In some other possible embodiments, there are multiple control output terminals 6540, and the multiple control output terminals 6540 are connected one by one to the first control terminal 5250 of the first input expansion unit 520, the second control terminal 5450 of the second input expansion unit 540, and the third control terminal 5650 of the third input expansion unit 560, so that the control module 70 can send control signals to the first input expansion unit 520, the second input expansion unit 540, and the third input expansion unit 560 respectively through the output control unit 650, thereby saving port resources of the control module 70.

[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 output terminal 5210 of the first input expansion unit 520, the second output terminal 5410 of the second input expansion unit 540, and the third output terminal 5610 of the third input expansion unit 560. The control module 70 is also electrically connected to the first input terminal 6120 of the first output expansion unit 610 and the second input terminal 6320 of the second output expansion unit 630. 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.11 , Fig.11 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 S1110: Acquire a first input signal from a first input expansion unit.

[0118] In this embodiment, the first input signal is determined based on the N pot detection signals output by the N pot detection modules, and the "first input signal" here can be understood as a mixed signal of the N pot detection signals. Specifically, the control module can sequentially turn on the branches between the N first input extension terminals and the first output terminal in the first input extension unit, and then sequentially obtain the pot detection signals output by the pot detection modules connected to the N first input extension terminals through the first output terminal. Therefore, the N pot detection signals in this embodiment can be input to the control module as one first input signal, which can save the interface resources of the control module.

[0119] As an implementation mode, the control module may obtain the first input signal from the first input expansion unit when receiving the control signal sent by the function panel. For example, when the button corresponding to the start heating mode on the function panel is triggered by the user, it indicates that the user has a heating demand for the pot. In this case, the control module needs to determine the specific placement position of the pot through the N-way pot detection signal.

[0120] Step S1120: determining a first resonance module based on a first input signal.

[0121] In this embodiment, the first resonance module represents the resonance module covered by the pot among the N pot detection modules. Since the first input signal can be understood as a mixed signal of N pot detection signals, the control module can obtain each pot detection signal from the first input signal in turn, and then determine whether the corresponding resonance module is the first resonance module through each pot detection signal. Specifically, the specific implementation method of the control module determining the first resonance module based on the first input signal is described in detail in the following embodiments.

[0122] Step S1130: sending a first output signal to the output expansion module, and the output expansion module controls the first switching switch to close the branch between the first resonant module and the inverter module based on the first output signal.

[0123] In this embodiment, the first switching switch refers to the switching switch connected between the first resonance module and the inverter module. When the control module determines the first resonance module, it further determines the switching switch connected to the first resonance module as the first switching switch, and sends a first output signal to the output expansion module to instruct the output expansion module to control the first switching switch to close the branch between the first resonance module and the inverter module based on the first output signal.

[0124] In this embodiment, the first output signal can be a parallel signal. For example, the first output signal can be "00110001", wherein each flag bit in the first output signal is used to control a switching switch. Therefore, the first output signal "00110001" can be used to control eight switching switches. Specifically, since the normally closed contact of the switching switch is connected to the pot detection module, and the normally open contact of the switching switch is connected to the inverter module, when the flag bit corresponding to the switching switch is 0, the switching switch is maintained to conduct the branch between the resonance module and the pot detection module; when the flag bit corresponding to the switching switch is 1, the switching switch is controlled to close the branch between the resonance module and the inverter module. At this time, the switching switch is the first switching switch.

[0125] Therefore, the control module in this embodiment only needs to output one signal to control N switching switches, which can save interface resources of the control module.

[0126] Step S1140: sending a driving pulse signal to the inverter module.

[0127] In this embodiment, the control module sends a driving pulse signal to the inverter module so that the inverter module supplies power to the first resonance module, so that the first resonance module heats the pot placed above it. The driving pulse signal may be a PWM signal, which is not specifically limited in this embodiment.

[0128] This embodiment provides a control method for an electrical device, in which the control module can obtain N-way pot detection signals through the first input expansion unit, thereby realizing input expansion of the control module. The control module can also control N switching switches through the output expansion module, thereby realizing output expansion of the control module, thereby saving interface resources of the control module and reducing the difficulty of chip selection.

[0129] See also Fig.12 , Fig.12 A control method for an electrical device provided in the second embodiment of the present application is schematically shown, and the embodiment specifically introduces the determination process of the first resonance module. Specifically, the method includes the following process.

[0130] Step S1210: Acquire a first input signal from a first input expansion unit.

[0131] Specifically, the specific implementation of step S1210 can refer to the detailed introduction of step S1110, which will not be described in detail here.

[0132] Step S1220: determining a first resonance module based on the first input signal.

[0133] In this embodiment, the first resonance module can be determined based on the change in the signal frequency of the pot detection signal. According to the relevant introduction of the electromagnetic heating circuit embodiment above, when the resonance module is covered by the pot, the signal frequency of the pot detection signal will increase. Therefore, the control module can determine whether the resonance module is the first resonance module based on the change in the signal frequency. Specifically, step S1220 may include steps S1221 to S1225.

[0134] Step S1221: acquiring the signal frequencies of N pot detection signals based on the first input signal.

[0135] In this embodiment, the control module can read N-way pot detection signals from the first input signal in sequence, and then determine the signal frequency of the N-way pot detection signals. As an implementation method, a timer can be provided in the control module. When the 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 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 then determines the inverse of the signal period as the signal frequency.

[0136] Step S1223: When the signal frequency belongs to a predetermined frequency interval, the pot detection signal corresponding to the signal frequency is determined as a target pot detection signal.

[0137] In this embodiment, the frequency range represents the range of the signal frequency of the pot detection signal when the resonant module is covered with a pot. For example, when performing hardware testing on electrical equipment, R&D personnel can directly connect the pot detection module and the resonant module, and place a pot on the resonant module, thereby obtaining multiple sets of test data detected by the pot detection module, and summarize the above frequency range based on the multiple sets of test data.

[0138] The control module determines the pot detection signal corresponding to the signal frequency as the target pot detection signal when the signal frequency belongs to the predetermined frequency interval. Conversely, when the signal frequency does not belong to the predetermined frequency interval, the pot detection signal is not the target pot detection signal.

[0139] Step S1225: determine the resonance module corresponding to the target pot detection signal as the first resonance module.

[0140] Step S1230: sending a first output signal to the output expansion module, and the output expansion module controls the first switching switch to close the branch between the first resonant module and the inverter module based on the first output signal.

[0141] Specifically, the specific implementation of step S1230 can refer to the detailed introduction of step S1130, which will not be repeated here.

[0142] Step S1240: sending a driving pulse signal to the inverter module.

[0143] In this embodiment, the inverter module includes M inverter units, where M is an integer greater than 0. In some possible embodiments, M takes a value of 1, that is, the number of the inverter unit is one, and the control module sends a drive pulse signal to the inverter unit. In other possible embodiments, M takes a value greater than 1, so when the number of the inverter units is multiple, the control module needs to determine a target inverter unit from the multiple inverter units, and then send a drive pulse signal to the target inverter unit. Specifically, step S1240 may include steps S1241 to S1245.

[0144] Step S1241, determining a target inverter unit among the M inverter units.

[0145] In this embodiment, the target inverter unit refers to the inverter unit that supplies power to the first resonant module. As an implementation method, the control module can determine in turn whether the M inverter units are in a working state, and then determine any one of the M inverter units that is not in a working state as the target inverter unit. Exemplarily, each inverter unit can correspond to a working state flag bit, for example, the working state flag bit can be a byte, if the value of the working state flag bit is 1, it means that the corresponding inverter unit is in a working state; if the value of the working state flag bit is 0, it means that the corresponding inverter unit is not in a working state.

[0146] Step S1243: Send a second output signal to the output expansion module, and the output expansion module controls the target source selection switch to close the branch between the first resonant module and the target inverter unit based on the second output signal.

[0147] In this embodiment, the target source selection switch refers to the source selection switch connected between the target inverter unit and the first resonant module. When the control module determines the target inverter unit, it sends a second output signal to the output expansion module to instruct the output expansion module to control the target source selection switch to close the branch between the first resonant module and the target inverter unit based on the second output signal.

[0148] In this embodiment, the second output signal may be a parallel signal, for example, the second output signal may be "10100010", wherein each flag bit in the second output signal is used to control a source selection switch, and therefore, the second output signal "10100010" may be used to control eight source selection switches. Specifically, when the flag bit corresponding to the source selection switch is 1, the source selection switch is controlled to close the branch between the first resonant module and the target inverter unit; when the flag bit corresponding to the source selection switch is 0, the current connection state of the source selection switch is maintained.

[0149] It is not difficult to understand here that the second output signal in this embodiment and the above-mentioned first output signal can be the same parallel signal, for example, the parallel signal can be "0011000110100010". Among them, the first 8 flag bits of the parallel signal can be used to control eight switching switches, and the last 8 flag bits of the parallel signal can be used to control eight source selection switches. Therefore, the control module in this embodiment only needs to output one signal to realize the control of N source selection switches and N switching switches, which can save the interface resources of the control module.

[0150] Step S1245, sending a driving pulse signal to the target inverter unit.

[0151] In this embodiment, the control module sends a driving pulse signal to the target inverter unit, so that the target inverter unit supplies power to the first resonance module, so that the first resonance module heats the pot placed thereon.

[0152] This embodiment provides a control method for electrical equipment, in which the control module can obtain N-channel pot detection signals through the first input expansion unit, thereby realizing the input expansion of the control module. The control module can also control N switching switches and N source selection switches through the output expansion module, thereby realizing the output expansion of the control module, thereby saving the interface resources of the control module and reducing the difficulty of chip selection.

[0153] See also Fig.13 , Fig.13 A control method for an electrical device provided in the third embodiment of the present application is schematically shown. Specifically, the method includes the following process.

[0154] Step S1310: Acquire a first input signal from a first input expansion unit.

[0155] Step S1320: determining a first resonance module based on a first input signal.

[0156] Step S1330: Send a first output signal to the output expansion module, and the output expansion module controls the first switching switch to close the branch between the first resonant module and the inverter module based on the first output signal.

[0157] Step S1340: sending a driving pulse signal to the inverter module.

[0158] Specifically, the specific implementation of steps S1310 to S1340 can refer to the detailed description in the above embodiments, which will not be described in detail here.

[0159] In this embodiment, since the user may adjust the placement of the pot during the heating process, this may cause the resonance module that was originally covered by the pot to be uncovered after the placement of the pot is changed. In this case, if the resonance module continues to be powered, the resonance module will be "unloaded", thereby affecting the service life of the coil in the resonance module. Therefore, the control module needs to detect the resonance module that is in the power supply state but not covered by the pot in a timely manner.

[0160] In some possible embodiments, the control module may determine whether the first resonance module is covered by the cookware according to the current value of the branch where the first resonance module is located. Specifically, when the first resonance module is not covered by the cookware, the inductance of the coil in the first resonance module will increase, so that the current value of the branch where the first resonance module is located will decrease. Specifically, after step S1340, steps S1351 to S1355 may also be included.

[0161] Step S1351: Acquire a second input signal from a second input expansion unit.

[0162] In this embodiment, the second input signal is determined based on the current detection signal output by the current detection module connected to the first resonance module, and the current detection signal is used to characterize the current change of the branch where the current detection module is located. The "second input signal" here can be understood as a mixed signal of multiple current detection signals.

[0163] Specifically, the control module can determine the second input extension terminal corresponding to the current detection module connected to the first resonance module, and then sequentially conduct the branches between the multiple second input extension terminals and the second output terminal in the second input extension unit, and sequentially obtain the current detection signals output by the current detection modules connected to the multiple second input extension terminals through the second output terminal. Therefore, the multiple current detection signals in this embodiment can be input to the control module as one second input signal, which can save the interface resources of the control module.

[0164] As an implementation mode, the control module may obtain the second input signal from the second input expansion unit at a preset time interval, wherein the preset time interval may be a preset value in the control module, or may be adjusted by the R&D personnel based on the actual working conditions of the electrical device. Specifically, the preset time interval may be greater than or equal to 1 second, for example, the preset time interval is 10 seconds, 20 seconds, and so on.

[0165] Step S1353, based on the second input signal, obtaining the signal effective value of the current detection signal.

[0166] In this embodiment, the control module can read multiple current detection signals from the second input signal in sequence, and then obtain the signal effective value of the current detection signal. Figure 4It is not difficult to see from part (e) that the current detection signal is a square wave signal, and the effective value of the square wave signal is the current value of the branch where the first resonance module is located. Specifically, the effective value of the current detection signal can be calculated by the following formula.

[0167]

[0168] Where, I is the effective value of the current detection signal, I max is the peak value of the square wave signal corresponding to the current detection signal, and P is the duty cycle of the square wave signal.

[0169] Step S1355: when the signal effective value is less than or equal to the specified effective value, it is determined that the first resonance module is not covered by the cookware.

[0170] In this embodiment, the specified effective value refers to the maximum current of the branch where the resonance module is located when the resonance module is not covered by the cookware. The specified effective value can be summarized by the R&D personnel based on a large amount of test data of the electrical equipment. For example, when the R&D personnel perform hardware testing on the electrical equipment, they can directly connect the current detection module and the resonance module, and do not place the cookware on the resonance module, and then obtain multiple groups of test data detected by the current detection module, and summarize the above-mentioned specified effective value based on the multiple groups of test data.

[0171] The control module determines that the first resonance module is not covered by the cookware when the signal effective value is less than or equal to the specified effective value. Conversely, the control module determines that the first resonance module is covered by the cookware when the signal effective value is greater than the specified effective value.

[0172] This embodiment provides a detection method for determining whether the first resonance module is covered by the cookware. Through this method, the control module can determine that the first resonance module is unloaded. In the subsequent process, the control module can stop the inverter module from supplying power to the first resonance module to ensure the service life of the first resonance module.

[0173] In some other possible embodiments, the control module can determine whether the first resonance module is covered by the cookware based on the lag time between the current detection signal of the branch where the first resonance module is located and the drive pulse signal input by the inverter module. When the first resonance module is not covered by the cookware, the inductance of the coil in the first resonance module will increase. Since the coil is an inductive load, when the inductance increases, the lag time will also increase. The lag time is Figure 4The time interval t1 of part (e) in the figure. Specifically, there are two drive pulse signals, and the two drive pulse signals include a complementary first pulse signal and a second pulse signal. When the amplitude of the first pulse signal is greater than 0, the amplitude of the current detection signal output by the current detection module connected to the first resonance module is greater than 0; when the amplitude of the second pulse signal is greater than 0, the amplitude of the current detection signal is equal to 0. Steps S1361 to S1367 may also be included after step S1340.

[0174] Step S1361, obtaining the first moment of the first pulse signal in the specified signal period.

[0175] In this embodiment, the first moment is the moment when the first pulse signal changes from a low level to a high level. The specified signal period may be the time interval corresponding to the change of two adjacent square wave pulses in the first pulse signal from a low level to a high level, that is, Figure 4 The time interval T in part (a).

[0176] Since the first pulse signal in this embodiment is a control signal generated inside the control module, the control module can determine the first moment of the first pulse signal in the specified signal period by obtaining the signal parameters of the first pulse signal (for example, the starting sending time, the signal period, etc.).

[0177] Step S1363: Acquire a third input signal from the second input expansion unit.

[0178] In this embodiment, the third input signal is determined based on the current detection signal output by the current detection module connected to the first resonance module. Specifically, the specific implementation of step S1363 can refer to the relevant introduction in step S1351, which will not be repeated here.

[0179] Step S1365: based on the third input signal, obtaining the current detection signal at the second moment of the specified signal cycle.

[0180] In this embodiment, the second moment is the moment when the current detection signal changes from a low level to a high level, and the second moment is later than the first moment. As an implementation method, the control module can read multiple current detection signals from the third input signal in sequence, and then obtain the second moment of the current detection signal in the specified signal cycle.

[0181] Specifically, the control module can sample the current detection signal within a specified signal period. If the current detection signal values ​​corresponding to two adjacent sampling moments are different, and the current detection signal value corresponding to the latter sampling moment is greater than the current detection signal value corresponding to the previous sampling moment, then any one of the two adjacent sampling moments can be determined as the second moment, or the average of the moments corresponding to the two adjacent sampling moments can be determined as the second moment.

[0182] Step S1367: When the difference between the second moment and the first moment is greater than a specified difference, it is determined that the first resonance module is not covered by the cookware.

[0183] In this embodiment, the difference between the second moment and the first moment is the above-mentioned hysteresis time. When the difference between the second moment and the first moment is greater than the specified difference, the control module determines that the first resonance module is not covered by the pot; conversely, when the difference between the second moment and the first moment is less than or equal to the specified difference, it is determined that the first resonance module is covered by the pot. Specifically, the specified difference can be summarized by R&D personnel based on a large amount of test data of electrical equipment. For example, when performing hardware testing on electrical equipment, R&D personnel can directly connect the current detection module and the resonance module, and do not place the pot on the resonance module, and then obtain multiple groups of test data detected by the current detection module, and summarize the above-mentioned specified difference based on the multiple groups of test data and the drive pulse signal input by the inverter module.

[0184] This embodiment provides a detection method for determining whether the first resonance module is covered by the cookware. Through this method, the control module can determine that the first resonance module is unloaded. In the subsequent process, the control module can stop the inverter module from supplying power to the first resonance module to ensure the service life of the first resonance module.

[0185] In some possible embodiments, after step S1355 and step S1367, step S1370 is further included.

[0186] Step S1370: Send a third output signal to the output expansion module, and the output expansion module controls the first switching switch to disconnect the branch between the first resonant module and the inverter module based on the third output signal.

[0187] It is not difficult to understand here that the third output signal and the first output signal are both used to control the switching switch. When the flag bit in the third output signal and the first output signal is 1, the switching switch is controlled to close the branch between the resonance module and the inverter module, and when the flag bit is 0, the switching switch is controlled to disconnect the branch between the resonance module and the inverter module.

[0188] For example, when the first output signal is "10000000", the first switching switch corresponding to the control flag bit 1 closes the branch between the first resonant module and the inverter module; when the third output signal is "00000000", the first switching switch is controlled to disconnect the branch between the first resonant module and the inverter module.

[0189] This embodiment provides a control method for an electrical device, in which the control module will again determine whether the first resonance module is covered by the cookware during the process of heating the cookware, so as to avoid the first resonance module being unloaded when the user changes the placement of the cookware. When it is determined that the first resonance module is unloaded, the inverter module is promptly controlled to stop supplying power to the first resonance module, so as to ensure the service life of the first resonance module.

[0190] See also Fig.14 , Fig.14 A control method for an electrical device provided in the fourth embodiment of the present application is schematically shown. Specifically, the method includes the following process.

[0191] Step S1410: Acquire a first input signal from a first input expansion unit.

[0192] Step S1420: determining a first resonance module based on a first input signal.

[0193] Step S1430: sending a first output signal to the output expansion module, and the output expansion module controls the first switching switch to close the branch between the first resonant module and the inverter module based on the first output signal.

[0194] Step S1440: sending a driving pulse signal to the inverter module.

[0195] Specifically, the specific implementation of steps S1410 to S1440 can refer to the detailed description in the above embodiments, which will not be described in detail here.

[0196] Step S1450: Acquire a fourth input signal from the first input expansion unit.

[0197] In this embodiment, the fourth input signal is determined based on K pot detection signals output by K pot detection modules, where K is an integer greater than 0 and less than N. In the process of heating the pot, the control module in this embodiment obtains the fourth input signal from the first input expansion unit.

[0198] In some possible scenarios, the user changes the placement of the cookware, causing the resonance module that was not previously covered by the cookware to be covered by the cookware. In this case, the control module needs to re-determine the resonance module that needs to be heated, and then power the newly added resonance module to ensure the heating efficiency of the cookware.

[0199] In some other possible scenarios, the user may place other pots to be heated on the electrical device. In this case, the control module needs to determine the resonance module covered by the newly added pots.

[0200] It is not difficult to understand here that, since in step S1420, the control module has determined some of the resonant modules that need to be heated and switched them to the branch where the inverter module is located, in step S1450, the control module only needs to obtain K pot detection signals output by the K pot detection modules connected to the remaining resonant modules, and obtain the K pot detection signals as one input signal (that is, the fourth input signal) through the first input expansion unit.

[0201] Step S1460: when it is determined based on the fourth input signal that the second resonance module exists, stop sending the driving pulse signal to the inverter module.

[0202] In this embodiment, the second resonance module represents the resonance module covered by the pot among the K pot detection modules, that is, the newly added resonance module that needs to be heated. When the control module determines that there is a second resonance module based on the fourth input signal, it stops sending a drive pulse signal to the inverter module. Specifically, the implementation method of the control module determining whether there is a second resonance module can refer to the relevant introduction of determining the first resonance module in step S1220, which will not be repeated here.

[0203] Step S1470: Send a fourth output signal to the output expansion module, and the output expansion module controls the second switching switch to close the branch between the second resonant module and the inverter module based on the fourth output signal.

[0204] In this embodiment, the second switching switch refers to the switching switch connected between the second resonance module and the inverter module. When the control module determines the second resonance module, it further determines the switching switch connected to the second resonance module as the second switching switch, and sends a fourth output signal to the output expansion module to instruct the output expansion module to control the second switching switch to close the branch between the second resonance module and the inverter module based on the fourth output signal.

[0205] It is not difficult to understand that both the fourth output signal and the first output signal are used to control the switching switch. Therefore, the specific implementation of step S1470 can refer to the relevant introduction in step S1130, which will not be repeated here.

[0206] Step S1480: sending a driving pulse signal to the inverter module.

[0207] The present embodiment provides a control method for electrical equipment, in which the control module will first stop controlling the inverter module when updating the resonant module to be heated, and then switch the newly added resonant module to be heated to the branch where the inverter module is located, thereby ensuring the working safety of the resonant module.

[0208] See also Fig.15 , Fig.15 A control method for an electrical device provided in the fifth embodiment of the present application is schematically shown. Specifically, the method includes the following process.

[0209] Step S1510: Acquire a first input signal from a first input expansion unit.

[0210] Step S1520: determining a first resonance module based on a first input signal.

[0211] Step S1530: sending a first output signal to the output expansion module, and the output expansion module controls the first switching switch to close the branch between the first resonant module and the inverter module based on the first output signal.

[0212] Step S1540: sending a driving pulse signal to the inverter module.

[0213] Specifically, the specific implementation of steps S1510 to S1540 can refer to the detailed description in the above embodiments, which will not be described in detail here.

[0214] Step S1550: Acquire a fifth input signal from the third input expansion unit.

[0215] In this embodiment, the fifth input signal is determined based on the temperature detection signal output by the temperature detection module connected to the first resonance module. The "fifth input signal" here can be understood as a mixed signal of multiple temperature detection signals.

[0216] Specifically, the control module can determine the third input extension terminal corresponding to the temperature detection module connected to the first resonance module, and then sequentially conduct the branches between the multiple third input extension terminals and the third output terminal in the third input extension unit, and sequentially obtain the temperature detection signals output by the temperature detection modules connected to the multiple third input extension terminals through the third output terminal. Therefore, the multiple temperature detection signals in this embodiment can be input to the control module as a fifth input signal, which can save the interface resources of the control module.

[0217] As an implementation mode, the control module may obtain the fifth input signal from the third input expansion unit at set time intervals, wherein the set time interval may be a preset value in the control module, or may be adjusted by the R&D personnel based on the actual working conditions of the electrical device. Specifically, the set time interval may be greater than or equal to 1 second, for example, the preset time interval is 10 seconds, 20 seconds, and so on.

[0218] Step S1560: Based on the fifth input signal, when the signal amplitude of the temperature detection signal is greater than or equal to the specified amplitude, increase the signal frequency of the driving pulse signal.

[0219] In this embodiment, the control module can read multiple temperature detection signals from the fifth input signal in sequence, and then obtain the signal amplitude of the temperature detection signal. As an implementation method, the control module can directly sample the temperature detection signal to obtain multiple signal sampling values, and determine the maximum value of the multiple signal sampling values ​​as the signal amplitude of the temperature detection signal.

[0220] When the control module determines that the signal amplitude of the temperature detection signal is greater than or equal to the specified amplitude, it means that the temperature of the space where the first resonance module is located is too high. In this case, the control module can increase the signal frequency of the drive pulse signal, thereby reducing the working power of the electrical device to reduce the working temperature of the electrical device, thereby avoiding the first resonance module from burning due to excessive temperature. Specifically, the specified amplitude can be a default value in the control module, or it can be adjusted by the R&D personnel based on the actual working conditions of the electrical device.

[0221] The present embodiment provides a control method for an electrical device, in which the control module obtains information about the space where the first resonance module is located when controlling the first resonance module to work, and then reduces the working power of the electrical device when the temperature is too high, so as to avoid the first resonance module from burning due to excessive temperature, thereby ensuring the working safety of the first resonance module.

[0222] See also Fig.16 , Fig.16A control device 1600 for an electrical device provided in an embodiment of the present application is schematically shown, and the device 1600 may include an acquisition unit 1610, a determination unit 1620, a first sending unit 1630, and a second sending unit 1640. Among them, the acquisition unit 1610 is used to acquire a first input signal from a first input expansion unit, and the first input signal is determined based on N pot detection signals output by N pot detection modules. The determination unit 1620 is used to determine a first resonance module based on the first input signal, and the first resonance module represents a resonance module covered by a pot among the N pot detection modules. The first sending unit 1630 is used to send a first output signal to an output expansion module, and the output expansion module controls the first switching switch to close a branch between the first resonance module and the inverter module based on the first output signal. The second sending unit 1640 is used to send a drive pulse signal to the inverter module.

[0223] In some possible embodiments, the second sending unit 1640 is specifically used to determine a target inverter unit among M inverter units; send a second output signal to the output expansion module, and the output expansion module controls the target source selection switch to close the branch between the first resonant module and the target inverter unit based on the second output signal; and send a drive pulse signal to the target inverter unit.

[0224] In some possible embodiments, the determination unit 1620 is specifically used to obtain the signal frequency of N pot detection signals based on the first input signal; when the signal frequency belongs to a predetermined frequency range, the pot detection signal corresponding to the signal frequency is determined as the target pot detection signal; and the resonance module corresponding to the target pot detection signal is determined as the first resonance module.

[0225] In some possible embodiments, the device 1600 may also include a first signal acquisition unit (not shown in the figure), a data acquisition unit (not shown in the figure) and a confirmation unit (not shown in the figure). Specifically, after the second sending unit 1640 sends a driving pulse signal to the inverter module, the first signal acquisition unit is used to obtain a second input signal from the second input expansion unit, and the second input signal is determined based on the current detection signal output by the current detection module connected to the first resonance module; the current detection signal is used to characterize the current change of the branch where the current detection module is located. The data acquisition unit is used to obtain the signal effective value of the current detection signal based on the second input signal. The confirmation unit is used to determine that the first resonance module is not covered by the pot when the signal effective value is less than or equal to the specified effective value.

[0226] In some possible embodiments, the driving pulse signal is two-way, and the two-way driving pulse signal includes a complementary first pulse signal and a second pulse signal. When the amplitude of the first pulse signal is greater than 0, the amplitude of the current detection signal output by the current detection module connected to the first resonance module is greater than 0; when the amplitude of the second pulse signal is greater than 0, the amplitude of the current detection signal is equal to 0; the current detection signal is used to characterize the current change of the branch where the current detection module is located. The device 1600 may also include a first moment acquisition unit (not shown in the figure), a first signal acquisition unit (not shown in the figure), a second moment acquisition unit (not shown in the figure) and a confirmation unit (not shown in the figure). Specifically, after the second sending unit 1640 sends a driving pulse signal to the inverter module, the first moment acquisition unit is used to acquire the first moment of the first pulse signal in the specified signal cycle, and the first moment is the moment when the first pulse signal changes from a low level to a high level. The first signal acquisition unit is used to obtain a third input signal from the second input expansion unit, and the third input signal is determined based on the current detection signal output by the current detection module connected to the first resonance module. The second moment acquisition unit is used to acquire the second moment of the current detection signal in the specified signal cycle based on the third input signal, the second moment is the moment when the current detection signal changes from a low level to a high level, and the second moment is later than the first moment. The confirmation unit is used to determine that the first resonance module is not covered by the cookware when the difference between the second moment and the first moment is greater than the specified difference.

[0227] In some possible embodiments, the device 1600 may further include a third sending unit (not shown in the figure). Specifically, after the confirmation unit determines that the first resonance module is not covered by the cookware, the third sending unit is used to send a third output signal to the output expansion module, and the output expansion module controls the first switching switch to disconnect the branch between the first resonance module and the inverter module based on the third output signal.

[0228] In some possible embodiments, the device 1600 may also include a second signal acquisition unit (not shown in the figure), a stop unit (not shown in the figure), and a fourth sending unit (not shown in the figure). Specifically, after the second sending unit 1640 sends a driving pulse signal to the inverter module, the second signal acquisition unit is used to obtain a fourth input signal from the first input extension unit, and the fourth input signal is determined based on K pot detection signals output by K pot detection modules, where K is an integer greater than 0 and less than N. The stop unit is used to stop sending a driving pulse signal to the inverter module when it is determined based on the fourth input signal that a second resonant module exists, and the second resonant module represents a resonant module covered by the pot among the K pot detection modules. The fourth sending unit is used to send a fourth output signal to the output extension module, and the output extension module controls the second switching switch to close the branch between the second resonant module and the inverter module based on the fourth output signal. The sending unit 1640 sends a driving pulse signal to the inverter module.

[0229] In some possible embodiments, the device 1600 may further include a third signal acquisition unit (not shown in the figure) and a frequency adjustment unit (not shown in the figure). Specifically, after the second sending unit 1640 sends a driving pulse signal to the inverter module, the third signal acquisition unit is used to obtain a fifth input signal from the third input expansion unit, and the fifth input signal is determined based on the temperature detection signal output by the temperature detection module connected to the first resonance module. The frequency adjustment unit is used to increase the signal frequency of the driving pulse signal based on the fifth input signal when the signal amplitude of the temperature detection signal is greater than or equal to the specified amplitude.

[0230] 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.

[0231] In several embodiments provided in the present application, the coupling between modules may be electrical, mechanical or other forms of coupling.

[0232] 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.

[0233] This embodiment provides a control device for an electrical device, in which a control module can obtain N-way pot detection signals through a first input expansion unit, thereby realizing input expansion of the control module. The control module can also control N switching switches through an output expansion module, thereby realizing output expansion of the control module, thereby saving interface resources of the control module and reducing the difficulty of chip selection.

[0234] 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.

[0235] 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.

[0236] 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.

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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; An inverter module, the inverter module is used to supply power to the N resonance modules; 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; An input expansion module, comprising a first input expansion unit, wherein the first input expansion unit is provided with a first output end and N first input expansion ends, and the N first input expansion ends are connected to the N pot detection modules in a one-to-one correspondence; The output expansion module comprises a first output expansion unit, wherein the first output expansion unit is provided with a first input terminal and N first output expansion terminals, and the N first output expansion terminals are connected to the N switching switches in a one-to-one correspondence; as well as The control module is electrically connected to the inverter module, the first output end of the first input expansion unit, and the first input end of the first output expansion unit respectively.

2. The electromagnetic heating circuit according to claim 1, characterized in that: The first input expansion unit is also provided with a first control end, and the control module is electrically connected to the first control end.

3. The electromagnetic heating circuit according to claim 2, characterized in that: The output expansion module is further provided with an output control unit, and the output control unit and the first output expansion unit are cascaded; The output control unit includes a control input terminal and a control output terminal, wherein the control input terminal is connected to the control module, and the control output terminal is connected to the first control terminal.

4. 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 input expansion module further includes a second input expansion unit, the second input expansion unit is provided with a second output terminal, a second control terminal and N second input expansion terminals; the N second input expansion terminals are connected to the N current detection modules one by one; The control module is electrically connected to the second output end and the second control end respectively.

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 input expansion module also includes a third input expansion unit, which is provided with a third output terminal, a third control terminal and N third input expansion terminals; the N third input expansion terminals are connected to the N temperature detection modules one by one; and the control module is electrically connected to the third output terminal and the third control terminal respectively.

6. The electromagnetic heating circuit according to claim 1, characterized in that: The inverter module includes M inverter units, each of which is provided with a signal terminal and an output terminal, the signal terminal is connected to the control module, and M is an integer greater than 1; The electromagnetic heating circuit further includes N source selection switches corresponding to the N resonance modules one by one, the source selection switch is provided with a second common terminal, a second active terminal and M third position terminals, the second active terminal is connected to the second common terminal, and the M third position terminals are connected to the output terminals of the M inverter units one by one; The output expansion module also includes a second output expansion unit, which is provided with a second input terminal and N second output expansion terminals, the second input terminal is connected to the control module, and the N second output expansion terminals are connected to the N source selection switches in a one-to-one correspondence.

7. The electromagnetic heating circuit according to claim 6, characterized in that: The first output expansion unit and the second output expansion unit are cascaded; The first input end of the first output expansion unit and the second input end of the second output expansion unit are connected to form a common connection end, and the common connection end is connected to the control module.

8. A control method for an electrical device, characterized in that: The electrical device comprises the electromagnetic heating circuit according to any one of claims 1 to 7, and the method comprises: Acquire a first input signal from the first input expansion unit, where the first input signal is determined based on N pot detection signals output by N pot detection modules; determining a first resonance module based on the first input signal, where the first resonance module represents a resonance module covered by the pot among the N pot detection modules; Sending a first output signal to an output expansion module, wherein the output expansion module controls a first switching switch to close a branch between the first resonant module and the inverter module based on the first output signal; A drive pulse signal is sent to the inverter module.

9. The method according to claim 8, characterized in that The step of sending a driving pulse signal to the inverter module comprises: Determining a target inverter unit among the M inverter units; Sending a second output signal to the output expansion module, wherein the output expansion module controls a target source selection switch to close a branch between the first resonant module and the target inverter unit based on the second output signal; The driving pulse signal is sent to the target inverter unit.

10. The method according to claim 8, characterized in that The determining a first resonance module based on the first input signal comprises: Based on the first input signal, acquiring signal frequencies of the N-channel pot detection signals; When the signal frequency belongs to a predetermined frequency interval, determining the pot detection signal corresponding to the signal frequency as the target pot detection signal; The resonance module corresponding to the target pot detection signal is determined as the first resonance module.

11. The method according to claim 8, characterized in that After sending the driving pulse signal to the inverter module, the method further includes: Acquire a second input signal from a second input expansion unit, where the second input signal is determined based on a current detection signal output by a current detection module connected to the first resonance module; the current detection signal is used to characterize a current change in a branch where the current detection module is located; Based on the second input signal, obtaining a signal effective value of the current detection signal; When the signal effective value is less than or equal to the specified effective value, it is determined that the first resonance module is not covered by the cooker.

12. The method according to claim 8, characterized in that There are two drive pulse signals, and the two drive pulse signals include a complementary first pulse signal and a second pulse signal. When the amplitude of the first pulse signal is greater than 0, the amplitude of the current detection signal output by the current detection module connected to the first resonance module is greater than 0; When the amplitude of the second pulse signal is greater than 0, the amplitude of the current detection signal is equal to 0; the current detection signal is used to characterize the current change of the branch where the current detection module is located; After sending the driving pulse signal to the inverter module, the method further includes: Acquire a first moment of the first pulse signal in a specified signal period, the first moment being a moment when the first pulse signal changes from a low level to a high level; Acquire a third input signal from the second input expansion unit, where the third input signal is determined based on a current detection signal output by a current detection module connected to the first resonance module; Based on the third input signal, obtaining the current detection signal at a second moment in the specified signal cycle, the second moment being the moment when the current detection signal changes from a low level to a high level, and the second moment is later than the first moment; When the difference between the second moment and the first moment is greater than a specified difference, it is determined that the first resonance module is not covered by the pot.

13. The method according to claim 11 or 12, characterized in that: After determining that the first resonance module is not covered by the cookware, the method further includes: A third output signal is sent to the output expansion module, and the output expansion module controls the first switching switch to disconnect the branch between the first resonance module and the inverter module based on the third output signal.

14. The method according to claim 8, characterized in that After sending the driving pulse signal to the inverter module, the method further includes: Acquire a fourth input signal from the first input expansion unit, where the fourth input signal is determined based on K pot detection signals output by K pot detection modules, where K is an integer greater than 0 and less than N; When it is determined based on the fourth input signal that the second resonance module exists, stopping sending the driving pulse signal to the inverter module, wherein the second resonance module represents the resonance module covered by the pot among the K pot detection modules; Sending a fourth output signal to the output expansion module, wherein the output expansion module controls the second switching switch to close the branch between the second resonant module and the inverter module based on the fourth output signal; A drive pulse signal is sent to the inverter module.

15. The method according to claim 8, characterized in that After sending the driving pulse signal to the inverter module, the method further includes: Acquire a fifth input signal from the third input expansion unit, where the fifth input signal is determined based on a temperature detection signal output by a temperature detection module connected to the first resonance module; Based on the fifth input signal, when the signal amplitude of the temperature detection signal is greater than or equal to a specified amplitude, the signal frequency of the driving pulse signal is increased.

16. A control device for an electrical device, characterized in that: The electrical equipment comprises the electromagnetic heating circuit according to any one of claims 1 to 7, and the device comprises: an acquisition unit, configured to acquire a first input signal from the first input expansion unit, wherein the first input signal is determined based on N pot detection signals output by the N pot detection modules; a determining unit, configured to determine a first resonance module based on the first input signal, wherein the first resonance module represents a resonance module covered by the pot among the N pot detection modules; A first sending unit, configured to send a first output signal to an output expansion module, wherein the output expansion module controls a first switching switch to close a branch between the first resonant module and the inverter module based on the first output signal; The second sending unit is used to send a driving pulse signal to the inverter module.

17. An electrical device, characterized in that: The electrical device comprises the electromagnetic heating circuit according to any one of claims 1 to 7, and the control module in the electromagnetic heating circuit comprises: one or more processors; Memory; and One or more applications, wherein one or more of the applications are stored in the memory and configured to be executed by one or more of the processors, and configured to execute the method according to any one of claims 8 to 15.

18. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, which can be called by a processor to execute the method according to any one of claims 8 to 15.

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