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 and a control module. The pot detection module is used for detecting whether the resonance module is covered by the pot or not. The fling-cut switch is provided with a common end, a movable end, a first position end and a second position end, the common end is connected to the resonance module, and the first position end is connected to the pot detection module; and the second position end is connected to the output end of the inversion module. The control module is electrically connected with the signal end of the inversion module, the N fling-cut switches and the N pot detection modules, the control module can determine whether a target fling-cut switch is in a normal working state or not based on signal parameters of a pot detection signal sent by the target fling-cut switch, and when the target fling-cut switch is in an abnormal working state, the fling-cut switch is switched on or off. The control module can send out alarm information to remind a user to maintain the electrical equipment in time.

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 pots to be heated can be placed above any one or more coil disks for heating, thus realizing the arbitrary placement of the pots.

[0003] In order to achieve induction heating of cookware, a pot detection device is usually set up in the full-area multi-burner stove to detect the cookware and determine the target coil disk that needs to be heated (that is, the coil disk covered by the cookware), and then connect the target coil disk to the heating source through the switching switch to control the target coil disk to work.

[0004] However, if the switching switch fails, it will cause the coil disk to detect abnormal pots, which will affect the normal operation of the multi-burner stove in the entire area. 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 one by one, N switching switches corresponding to the N resonance modules one by one, and a control module, where N is an integer greater than 1. Among them, the inverter module is provided with a signal end and an output end, and the output end 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 common end, an active end, a first position end, and a second position end, and the active end is connected to the common end; the common end is connected to the resonance module, the first position end is connected to the pot detection module; the second position end is connected to the output end of the inverter module. The control module is electrically connected to the signal end of the inverter module, N switching switches and N pot detection modules respectively, and the control module is configured to: control the target switching switch to turn on the branch between the target pot detection module and the target resonance module; obtain the signal parameters of the pot detection signal sent by the target pot detection module, and the pot detection signal is used to characterize whether the target resonance module is covered by the pot; when the signal parameter belongs to a predetermined specified interval, it is determined that the target switching switch is in a normal working state; the specified interval represents the range corresponding to the signal parameter when the target pot detection module and the target resonance module are normally connected.

[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: controlling a target switching switch to turn on a branch between a target pot detection module and a target resonance module; obtaining signal parameters of a pot detection signal sent by the target pot detection module, the pot detection signal being used to characterize whether the target resonance module is covered by the pot; when the signal parameter belongs to a predetermined specified interval, determining that the target switching switch is in a normal working state; the specified interval characterizes the range corresponding to the signal parameter when normal conduction occurs between the target pot detection module and the target resonance 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 a control unit, an acquisition unit and a determination unit. Among them, the control unit is used to control the target switching switch to conduct the branch between the target pot detection module and the target resonance module. The acquisition unit is used to obtain the signal parameters of the pot detection signal sent by the target pot detection module, and the pot detection signal is used to characterize whether the target resonance module is covered by the pot. The determination unit is used to determine that the target switching switch is in a normal working state when the signal parameter belongs to a predetermined specified interval; the specified interval represents the range corresponding to the signal parameter when the target pot detection module and the target resonance module are normally connected.

[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, a device and an electrical device for an electromagnetic heating circuit. The electromagnetic heating circuit includes N resonance modules, an inverter module, N pot detection modules corresponding to the N resonance modules one by one, N switching switches corresponding to the N resonance modules one by one and a control module, where N is an integer greater than 1. The control module is electrically connected to the signal end of the inverter module, the N switching switches and the N pot detection modules, respectively. On the one hand, the control module can control the target switching switch to conduct the branch between the target pot detection module and the target resonance module, so that the target pot detection module enters the pot detection state. On the other hand, the control module can obtain the signal parameters of the pot detection signal sent by the target pot detection module, and then judge whether the target switching switch is in a normal working state based on the signal parameters.

[0013] Specifically, when the target switching switch is in a normal working state, the control module can smoothly control the target switching switch to conduct the branch between the target pot detection module and the target resonance module. At this time, the signal parameter of the pot detection signal belongs to the specified interval, which is a predetermined interval determined by the R&D personnel. For example, when the R&D personnel conduct hardware testing on the electrical equipment, the interval is obtained based on the summary of multiple groups of test data. On the contrary, if the signal parameter does not belong to the specified interval, it means that the target switching switch is in an abnormal working state. In this case, the control module can issue an alarm message to remind the user to repair the electrical equipment in time to ensure the normal use of the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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.

[0015] Figure 1 It is a structural schematic diagram of an electrical device provided in an embodiment of the present application.

[0016] Figure 2 yes Figure 1 Schematic diagram of the electromagnetic heating circuit.

[0017] Figure 3 yes Figure 2 Schematic diagram of the inverter module.

[0018] Figure 4 yes Figure 2 Schematic diagram of the signal waveform corresponding to the electromagnetic heating circuit shown.

[0019] Figure 5 yes Figure 2Schematic diagram of the structure of the resonance module.

[0020] Figure 6 yes Figure 2 Schematic diagram of the structure of the central inspection pot module.

[0021] Figure 7 yes Figure 2 Schematic diagram of the structure of the current detection module.

[0022] Figure 8 It is a flowchart of a control method for electrical equipment provided in the first embodiment of the present application.

[0023] Fig. 9 It is a flow chart of a control method of an electrical device provided in the second embodiment of the present application.

[0024] Fig.10 It is a flow chart of a control method of an electrical device provided in the third embodiment of the present application.

[0025] Fig.11 It is a module block diagram of a control device for an electrical device provided in an embodiment of the present application.

[0026] Fig.12 It is a module block diagram of the electrical equipment provided in the embodiment of the present application.

[0027] Fig.13 It is a module block diagram of the computer-readable storage medium provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0029] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0030] The present application provides an electromagnetic heating circuit, a control method, a device and an electrical device for an electromagnetic heating circuit. The electromagnetic heating circuit includes N resonance modules, an inverter module, N pot detection modules corresponding to the N resonance modules one by one, N switching switches corresponding to the N resonance modules one by one and a control module, where N is an integer greater than 1. The control module is electrically connected to the signal end of the inverter module, the N switching switches and the N pot detection modules, respectively. On the one hand, the control module can control the target switching switch to conduct the branch between the target pot detection module and the target resonance module, so that the target pot detection module enters the pot detection state. On the other hand, the control module can obtain the signal parameters of the pot detection signal sent by the target pot detection module, and then judge whether the target switching switch is in a normal working state based on the signal parameters.

[0031] Specifically, when the target switching switch is in a normal working state, the control module can smoothly control the target switching switch to conduct the branch between the target pot detection module and the target resonance module. At this time, the signal parameter of the pot detection signal belongs to the specified interval, which is a predetermined interval determined by the R&D personnel. For example, when the R&D personnel conduct hardware testing on the electrical equipment, the interval is obtained based on the summary of multiple groups of test data. On the contrary, if the signal parameter does not belong to the specified interval, it means that the target switching switch is in an abnormal working state. In this case, the control module can issue an alarm message to remind the user to repair the electrical equipment in time to ensure the normal use of the electrical equipment.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The electromagnetic heating circuit 100 is used to control the coil 250 to work. Specifically, there may be multiple electromagnetic heating circuits 100, and the multiple electromagnetic heating circuits 100 are used to control some of the coils 250 in the multiple coils 250 respectively. Figure 1In the embodiment shown, there are two electromagnetic heating circuits 100, each of which is used to control 25 coils. Specifically, one electromagnetic heating circuit 100 controls coils No. 1 to No. 25, and the other electromagnetic heating circuit 100 controls coils No. 26 to No. 50.

[0039] See also Figure 2 The electromagnetic heating circuit 100 may include an inverter module 10, N resonance modules 30, N pot detection modules 40 corresponding to the N resonance modules 30, N switching switches 50 corresponding to the N resonance modules 30, and a control module 60, where N is an integer greater than 1. The inverter module 10 is provided with a signal terminal 120 and an output terminal 140, and the output terminal 140 is used to supply power to the N resonance modules 30. The pot detection module 40 is used to detect whether the resonance module 30 is covered by a pot. The switching switch 50 is provided with a common terminal 520, an active terminal 540, a first position terminal 560, and a second position terminal 580, and the active terminal 540 is connected to the common terminal 520; the common terminal 520 is connected to the resonance module 30, the first position terminal 560 is connected to the pot detection module 40; and the second position terminal 580 is connected to the output terminal 140 of the inverter module 10. The control module 60 is electrically connected to the signal end 120 of the inverter module 10, N switching switches 50 and N pot detection modules 40 respectively, and the control module 60 is configured to: control the target switching switch to turn on the branch between the target pot detection module and the target resonance module; obtain the signal parameters of the pot detection signal sent by the target pot detection module, and the pot detection signal is used to characterize whether the target resonance module is covered by the pot; when the signal parameter belongs to a predetermined specified interval, it is determined that the target switching switch is in a normal working state; the specified interval represents the range corresponding to the signal parameter when the target pot detection module and the target resonance module 30 are normally connected.

[0040] When the target switching switch is in a normal working state, the control module 60 can smoothly control the target switching switch to conduct the branch between the target pot detection module and the target resonance module. At this time, the signal parameter of the pot detection signal belongs to the specified interval, which is the interval predetermined by the R&D personnel. For example, when the R&D personnel conduct hardware testing on the electrical equipment, the interval is obtained based on the summary of multiple groups of test data. On the contrary, if the signal parameter does not belong to the specified interval, it means that the target switching switch is in an abnormal working state. In this case, the control module 60 can issue an alarm message to remind the user to repair the electrical equipment 200 in time to ensure the normal use of the electrical equipment 200.

[0041] The specific implementation of each module in the electromagnetic heating circuit 100 is introduced below.

[0042] In this embodiment, the inverter module 10 is used to supply power to the resonance module 30. Specifically, the inverter module 10 can output an alternating current, thereby causing the coil in the resonance module 30 to generate an alternating magnetic field, thereby heating the pot placed in the alternating magnetic field.

[0043] In some possible embodiments, the inverter module 10 may be an inverter circuit (eg, a single-phase half-bridge inverter circuit, a single-phase full-bridge inverter circuit, etc.). Figure 3 The number of signal terminals 120 of the inverter module 10 is two, and the two signal terminals 120 include a first signal terminal 1210 and a second signal terminal 1230. The first signal terminal 1210 and the second signal terminal 1230 are respectively connected to the control module 60. The first signal terminal 1210 can be used to input a first pulse signal PWM_H, and the second signal terminal 1230 can be used to input a second pulse signal PWM_L. The first pulse signal PWM_H and the second pulse signal PWM_L are a pair of complementary pulse width modulation (PWM) signals, that is, when the first pulse signal PWM_H is at a high level, the second pulse signal PWM_L is at a low level, and when the first pulse signal PWM_H is at a low level, the second pulse signal PWM_L is at a high level. Please refer to Figure 4 , Figure 4 Part (a) is the waveform curve of the first pulse signal PWM_H. Figure 4 Part (b) is the waveform curve of the second pulse signal PWM_L.

[0044] Please refer again Figure 3The inverter module 10 may include a first switch tube Q1, a second switch tube Q2, a first resonant absorption capacitor CM1, and a second resonant absorption capacitor CM2. The first end 11 of the first switch tube Q1 is connected to the third power supply terminal 21, the control end 12 of the first switch tube Q1 is connected to the first signal terminal 1210, and the second end 13 of the first switch tube Q1 is connected to the first end 15 of the second switch tube Q2 to form a common end, which is connected to the output terminal 140. The control end 16 of the second switch tube Q2 is connected to the second signal terminal 1230, and the second end 17 of the second switch tube Q2 is grounded. Specifically, the first switch tube Q1 and the second switch tube Q2 can 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 IGBTs, 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 IGBTs, 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 IGBTs. Therefore, the inverter module 10 in this embodiment adopts the structure of a single-phase half-bridge inverter circuit, and the first switch tube Q1 and the second switch tube Q2 can be in a complementary conduction state under the control of the first pulse signal PWM_H and the second pulse signal PWM_L. The third power supply terminal 21 is used to provide a DC voltage VBUS, and the DC voltage VBUS can be a voltage after the mains voltage is rectified by a rectifier circuit, that is, the amplitude of the DC voltage VBUS can be 220V.

[0045] 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.

[0046] In some possible embodiments, the number of inverter modules 10 may be multiple, and the multiple inverter modules 10 can heat multiple pots placed on the electrical device 200 simultaneously. Specifically, the number of inverter modules 10 may be equal to the number of pots that can be heated simultaneously on the heating circuit 100. Therefore, when multiple pots need to be heated simultaneously, different inverter modules 10 can independently control multiple coils covered by different pots, and multiple coils covered by the same pot are controlled by the same inverter module 10, so that multiple pots can be heated independently, respectively, to improve the cooking efficiency of the user.

[0047] In this embodiment, the resonance module 30 is used to generate an alternating magnetic field under the excitation of an alternating current. Figure 5 , the resonance module 30 may include a coil LX, a first resonance capacitor CX1 and a second resonance capacitor CX2. Among them, one end of the first resonance capacitor CX1 and the second resonance capacitor CX2 connected in series is connected to the third power supply terminal 21, and the other end is grounded. The first end 31 of the coil LX is connected to the current detection module 70, and the second end 32 is connected to the common end of the first resonance capacitor CX1 and the second resonance capacitor CX2. Specifically, when the branch between the resonance module 30 and one of the inverter modules 10 is turned on, when the first switch tube Q1 in the inverter module 10 is turned on, the coil LX and the second resonance capacitor CX2 resonate; when the second switch tube Q2 in the inverter module 10 is turned on, the coil LX and the first resonance capacitor CX1 resonate.

[0048] It should be noted here that the coil LX in the resonance module 30 is Figure 1 Therefore, in this embodiment, the resonance module 30 and the coil 250 are in a one-to-one correspondence. Therefore, when the electromagnetic heating circuit 100 is used to control 25 coils 250, the number of the resonance modules 30 is also 25, that is, N is 25.

[0049] In this embodiment, the switching switch 50 is respectively connected to the resonance module 30, the pot detection module 40 and the inverter module 10, and is used to conduct the branch between the resonance module 30 and the pot detection module 40, or conduct the branch between the resonance module 30 and the inverter module 10. The switching switch 50 may be provided with a common terminal 520, an active terminal 540, a first position terminal 560 and a second position terminal 580, the active terminal 540 is connected to the common terminal 520, the common terminal 520 is connected to the resonance module 30, the first position terminal 560 is connected to the pot detection module 40, and the second position terminal 580 is connected to the output terminal 140 of the inverter module 10. Therefore, when the active end 540 is connected to the first position end 560, the switching switch 50 can conduct the branch between the resonance module 30 and the pot detection module 40, so that the pot detection module 40 can detect whether a pot is placed above the resonance module 30; when the active end 540 is connected to the second position end 580, the switching switch 50 can conduct the branch between the resonance module 30 and the inverter module 10, so that the inverter module 10 can supply power to the resonance module 30. Specifically, the switching switch 50 can be a relay switch, for example, a single-pole double-throw relay.

[0050] It should be noted here that in order to avoid the situation where the inverter module 10 supplies power to the resonance module 30 when the resonance module 30 is not covered by the cookware, the second position end 580 of the switching switch 50 in this embodiment is the normally open contact of the single-pole double-throw relay, and the first position end 560 is the normally closed contact of the single-pole double-throw relay.

[0051] In this embodiment, the pot detection module 40 is used to detect whether the resonance module 30 is covered by the pot. Specifically, when the branch between the resonance module 30 and the pot detection module 40 is connected and the resonance module 30 is covered by the pot, the inductance value of the coil LX in the resonance module 30 will change. The pot detection module 40 can output pot detection signals of different frequencies to the control module 60 based on the change of the coil inductance value. The control module 60 then determines whether the resonance module 30 is covered by the pot based on the above pot detection signal. Please refer to Figure 6 The pot detection module 40 may include an oscillation unit 410 , a voltage pull-up unit 430 and a signal comparison unit 450 .

[0052] The oscillation unit 410 is provided with a detection end 4100 , which is connected to the first position end 560 of the switching switch 50 . The detection end 4100 is used to output a detection signal, which is used to characterize the change of the inductance value of the resonance module connected to the oscillation unit 410 .

[0053] In some possible embodiments, the oscillation unit 410 may be an oscillation circuit (for example, an inductor three-point oscillation circuit, a capacitor three-point oscillation circuit). Here, the oscillation unit 410 is a capacitor three-point oscillation circuit for the purpose of introduction. Specifically, the oscillation unit 410 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 41 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 43 of the transistor Q3 is connected to the detection terminal 4100, and is connected to the first power supply terminal 23 through the third resistor R3. The second terminal 45 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.

[0054] As an implementation, the transistor Q3 may be a bipolar junction transistor (BJT), the control terminal 41 of the transistor Q3 is the base of the BJT tube, the first terminal 43 of the transistor Q3 is the collector of the BJT tube, and the second terminal 45 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.

[0055] The first capacitor C1 is connected between the first end 43 and the second end 45 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 4100, 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 40 is not connected to the resonance module 30, the signal frequency of the detection signal output by the detection end 4100 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.

[0056] When the pot detection module 40 is connected to the resonance module 30, the coil LX, the first resonance capacitor CX1 and the second resonance capacitor CX2 in the resonance module 30 are connected to the oscillation unit 410. Specifically, the resonance circuit formed by the coil LX, the first resonance capacitor CX1 and the second resonance 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 4100 is the resonance 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 resonance capacitor CX1 and the second resonance capacitor CX2. Specifically, the signal frequency of the detection signal can be determined by the following frequency calculation formula.

[0057]

[0058] Wherein, f is the signal frequency of the detection signal, L is the equivalent inductance value of the pot detection module 40 and the resonance module 30, and C is the equivalent capacitance value of the pot detection module 40 and the resonance module 30. Specifically, when the resonance module 30 is covered by the pot, the equivalent inductance value of the coil LX will decrease, and the equivalent inductance value of the pot detection module 40 and the resonance module 30 will also decrease, so that the signal frequency of the detection signal becomes larger.

[0059] The voltage pull-up unit 430 is connected between the detection terminal 4100 of the oscillation unit 410 and the positive phase input terminal of the signal comparison unit 450, 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 450. Specifically, the voltage pull-up unit 430 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 4501, and one end of the sixth resistor R6 is connected to the positive phase input terminal 4501, 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 of the signal comparison unit 450 is the superimposed voltage of the divided VDD1 and the detection signal.

[0060] In some possible embodiments, the voltage pull-up unit 430 may further include a fifth capacitor C5, one end of the fifth capacitor C5 is connected to the detection end 4100 of the oscillation unit 410, and the other end is connected to the non-inverting input end 4501. 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 410 to prevent the first power supply voltage VDD1 from affecting the signal input of the signal comparison unit 450.

[0061] The inverting input terminal 4503 of the signal comparison unit 450 is used to input the reference voltage Vref, and the output terminal 4505 of the signal comparison unit 450 is connected to the control module 60, which is used to output the pot detection signal to the control module 60. Specifically, the signal comparison unit 450 includes a voltage comparator 4500, a seventh resistor R7 and a sixth capacitor C6.

[0062] The positive input terminal 4501 of the voltage comparator 4500 is connected to the voltage pull-up unit 430, the negative input terminal 4503 of the voltage comparator 4500 is used to input the reference voltage Vref, and the output terminal 4505 of the voltage comparator 4500 is connected to the control module 60. 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 4500 is used to compare the voltage between the positive input terminal 4501 and the negative input terminal 4503. When the input voltage of the positive input terminal 4501 is greater than the input voltage of the negative input terminal 4503, the output terminal 4505 of the voltage comparator can output a high level signal; when the input voltage of the positive input terminal 4501 is less than the input voltage of the negative input terminal 4503, the output terminal 4505 of the voltage comparator 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 60 can determine whether the resonance module 30 is covered by the pot based on the pot detection signal.

[0063] The seventh resistor R7 is connected between the first power supply terminal 23 and the output terminal 4505 of the voltage comparator 4500. 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 4505 of the voltage comparator 4500, 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 and the normal output of the pot detection signal is ensured.

[0064] In some possible embodiments, the pot detection module 40 may further include an isolation unit 470, which is connected between the detection end 4100 of the oscillation unit 410 and the first position end 560 of the switching switch 50, and can isolate the DC voltage VBUS input by the resonance module 30 to prevent the DC voltage VBUS from affecting the normal operation of the oscillation unit 410. Specifically, the isolation unit 470 may include a seventh capacitor C7, which is connected between the detection end 4100 of the oscillation unit 410 and the first position end 560 of the switching switch 50. It is not difficult to understand here that when the pot detection module 40 is connected to the resonance module 30, the seventh capacitor C7 and the fifth capacitor C5 mentioned above will also participate in the resonance between the pot detection module 40 and the resonance module 30.

[0065] Please refer again Figure 2 The electromagnetic heating circuit 100 may also include N current detection modules 70 corresponding to the N resonance modules 30. The current detection module 70 is connected between the common terminal 520 of the switching switch 50 and the resonance module 30, and is used to obtain a current detection signal. The current detection signal is used to characterize the current change of the branch where the specified current detection module 70 is located. Figure 7 The current detection module 70 may include a current detection unit 720, a voltage conversion unit 740 and a voltage comparison unit 760. The input terminal 7200 of the current detection unit 720 is connected between the common terminal 520 of the switching switch 50 and the resonance module 30, and is used to obtain the current signal of the branch where the current detection unit 720 is located.

[0066] The input end 7200 of the current detection unit 720 may include a first input end 7201 and a second input end 7203, wherein the first input end 7201 is connected to the common end 520 of the switching switch 50, and the second input end 7203 is connected to the first end 31 of the coil LX in the resonance module 30. Therefore, the current detection unit 720 is connected in series in the branch where the resonance module 30 is located through the first input end 7201 and the second input end 7203. Please refer to Figure 4 , Figure 4 Part (c) in the figure is the waveform diagram corresponding to the current signal. It is not difficult to see from the current waveform diagram that the current in the branch where the resonance module 30 is located is an alternating current, that is, under the control of the first pulse signal PWM_H and the second pulse signal PWM_L, the current direction is constantly changing. Specifically, under the control of the first pulse signal PWM_H, the current direction is in the positive direction, and the current amplitude is greater than 0; under the control of the second pulse signal PWM_L, the current direction is in the reverse direction, and the current amplitude is less than 0.

[0067] The output terminal 7220 of the current detection unit 720 is used to output the current signal converted by the current detection unit 720. Specifically, the current detection unit 720 can be a current transformer. It should be noted here that since the inverter module 10 and the resonance module 30 are respectively connected to the mains, the current value of the branch where the resonance module 30 is located is relatively large, so it is necessary to reduce the current value through a current transformer to match the subsequent circuit. Among them, the output terminal 7220 of the current detection unit 720 may include a first output terminal 7221 and a second output terminal 7223, and the first output terminal 7221 is connected to the first power supply terminal 23.

[0068] The voltage conversion unit 740 is connected between the output terminal 7220 of the current detection unit 720 and the positive phase input terminal 7600 of the voltage comparison unit 760, and is used to convert the current signal output by the current detection unit 720 into a voltage signal. Specifically, the voltage conversion unit 740 may include an eighth resistor R8 and a ninth resistor R9. Among them, the eighth resistor R8 is connected between the first output terminal 7221 and the second output terminal 7223, and the eighth resistor R8 can convert the current signal output by the current detection unit 720 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 7221, the input voltage at the positive phase input terminal 7600 of the voltage comparison unit 760 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 7223 and the positive phase input terminal 7600 of the voltage comparison unit 760, 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 760 from being too large.

[0069] 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 7600 of the voltage comparison unit 760. 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 30 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 7600. Specifically, when the current amplitude of the branch where the resonance module 30 is located is greater than 0, the amplitude of the input voltage of the positive phase input terminal 7600 is greater than VDD1; when the current amplitude of the branch where the resonance module 30 is located is less than 0, the amplitude of the input voltage of the positive phase input terminal 7600 is less than VDD1.

[0070] In this embodiment, the voltage conversion unit 740 may further include a tenth resistor R10, one end of the tenth resistor R10 is connected to the non-inverting input terminal 7600 of the voltage comparison unit 760, 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 7600, 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 7600 is always greater than 0, thereby ensuring the working stability of the voltage comparison unit 760.

[0071] The inverting input terminal 7620 of the voltage comparison unit 760 is connected to the first power supply terminal 23, so the input voltage of the inverting input terminal 7620 is the first power supply voltage VDD1. The output terminal 7640 of the voltage comparison unit 760 is connected to the control module 60, which is used to output a current detection signal to the control module 60. Specifically, the voltage comparison unit 760 can be a voltage comparator COMP2, and the voltage comparator COMP2 is used to compare the voltage between the positive input terminal 7600 and the inverting input terminal 7620. When the input voltage of the positive input terminal 7600 is greater than the input voltage of the inverting input terminal 7620, the output terminal 7640 of the voltage comparator COMP2 can output a high level signal; when the input voltage of the positive input terminal 7600 is less than the input voltage of the inverting input terminal 7620, the output terminal 7640 of the voltage comparator COMP2 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 7640, and the waveform of the output signal is a square wave.

[0072] Therefore, in this embodiment, the current detection module 70 is provided to convert the current signal of the branch where the current detection module 70 is located into a square wave signal (that is, a current detection signal). 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.

[0073] In some possible embodiments, the current detection module 70 may further include an eleventh resistor R11, one end of the eleventh resistor R11 is connected to the output end 7640 of the voltage comparison unit 760, 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.

[0074] In some possible embodiments, the current detection module 70 may further include an eighth capacitor C8, which is connected between the positive input terminal 7600 and the negative input terminal 7620 of the voltage comparison unit 760. The eighth capacitor C8 can filter the instantaneously changing voltage to avoid misjudgment of the voltage comparison unit 760 when the input voltage of the positive input terminal 7600 or the input voltage of the negative input terminal 7620 suddenly changes, thereby ensuring the normal output of the detection signal.

[0075] In this embodiment, the control module 60 is electrically connected to the signal terminal 120 of the inverter module 10, the N switching switches 50 and the N pot detection modules 40, respectively. On the one hand, the control module can control the target switching switch to conduct the branch between the target pot detection module and the target resonance module, so that the target pot detection module enters the pot detection state. On the other hand, the control module 60 can obtain the signal parameters of the pot detection signal sent by the target pot detection module, and then judge whether the target switching switch is in a normal working state based on the signal parameters. Specifically, the control module 60 can be a control chip, an integrated circuit board and other structures.

[0076] In some other possible embodiments, the control module 60 is electrically connected to N current detection modules 70, respectively. The control module 60 can also send a drive pulse signal to the inverter module 10, and determine whether the switching switch 50 connected to the designated current detection module is in a normal working state based on the current detection signal and the drive pulse signal sent by the designated current detection module. It should be noted here that the resonance module 30 where the designated current detection module is located refers to the resonance module covered by the cookware. At this time, the switching switch 50 connected to the resonance module 30 turns on the branch between the resonance module 30 and the inverter module 10. In this case, the control module 60 determines whether the switching switch 50 is in a normal working state. Specifically, the control process of the control module 60 is described in detail in the method embodiment below.

[0077] The control method applied to the above-mentioned electrical device 200 is introduced below.

[0078] See also Figure 8 , Figure 8 A control method for an electrical device provided in the first embodiment of the present application is schematically shown, and the electrical device includes the above-mentioned electromagnetic heating circuit. Specifically, the method includes the following process.

[0079] Step S810, controlling the target switching switch to conduct the branch between the target pot detection module and the target resonance module.

[0080] In this embodiment, the target pot detection module and the target resonance module refer to two modules connected to the target switching switch, that is, the target pot detection module, the target resonance module and the target switching switch are located in the same branch.

[0081] In some possible embodiments, the target switching switch may be any switching switch in the electromagnetic heating circuit. As an implementation mode, the control module may control the target switching switch to conduct the branch between the target pot detection module and the target resonance module 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 means that the user has a heating demand for the pot. In this case, the control module may control all the switching switches in the electromagnetic heating circuit so that the branch between each resonance module and the corresponding pot detection module is conducted. As another implementation mode, the control module may automatically generate a switch detection indication when the electrical device is powered on. In response to the switch detection indication, the control module controls the target switching switch to conduct the branch between the target pot detection module and the target resonance module, and then detects whether the normally closed contact of the target switching switch is in a normal working state.

[0082] In some other possible embodiments, the target switching switch may be the switching switch corresponding to the resonance module that is not covered by the cookware in the electromagnetic heating circuit. As an implementation mode, the control module may control the target switching switch to conduct the branch between the target pot detection module and the target resonance module during the process of heating the cookware, so that the control module may update the coverage of the resonance module. For example, during the process of heating the cookware, if the user moves the placement of the cookware, some resonance modules that are not covered by the cookware may be covered by the cookware. In this case, the control module may detect the newly added resonance module covered by the cookware, and in the subsequent process, the control module may control the above-mentioned resonance module to ensure the heating efficiency of the cookware.

[0083] Specifically, the control module can send a first control signal to the target switching switch every preset time, and the first control signal is used to control the target switching switch to conduct the branch between the target pot detection module and the target resonance module. The preset time can be a default value in the control module, or it can be adjusted by the R&D personnel based on the specific working conditions of the electrical equipment. For example, the preset time can be 1s, 5s, etc., which is not specifically limited in this embodiment.

[0084] Step S820: acquiring signal parameters of the pot detection signal sent by the target pot detection module.

[0085] In this embodiment, the pot detection signal is used to indicate whether the target resonance module is covered by the pot. According to the relevant introduction of the electromagnetic heating circuit embodiment above, the pot detection signal sent by the target pot detection module is a square wave signal, and the signal parameters of the pot detection signal may include the signal period, signal frequency, etc. of the square wave signal.

[0086] Specifically, a timer may 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 further determines the reciprocal of the signal period as the signal frequency.

[0087] Step S830: When the signal parameter belongs to a predetermined specified interval, it is determined that the target switching switch is in a normal working state.

[0088] In this embodiment, the designated interval represents the range corresponding to the signal parameter when the target pot detection module and the target resonance module are normally connected. For example, when the R&D personnel perform hardware testing on the electrical equipment, they can directly connect the pot detection module and the resonance module to obtain multiple sets of test data detected by the pot detection module, and summarize the multiple sets of test data to obtain the above-mentioned designated interval. Specifically, the above-mentioned multiple sets of test data include data when the resonance module is covered by the pot, and may also include data when the resonance module is not covered by the pot.

[0089] When the target switching switch is in a normal working state, the control module can smoothly control the target switching switch so that the branch between the target pot detection module and the target resonance module is smoothly turned on, so that the signal parameters of the pot detection signal sent by the target pot detection module belong to the above-mentioned specified interval. On the contrary, when the target switching switch is in an abnormal working state, for example, the electromagnetic heating circuit where the target switching switch is located may have an overtemperature, or the branch between the target switching switch and the control module is broken. At this time, the control module cannot control the target switching switch to turn on the branch between the target pot detection module and the target resonance module, so that the signal parameters of the pot detection signal sent by the target pot detection module do not belong to the above-mentioned specified interval.

[0090] Therefore, when the working state of the target switching switch is unknown, the control module can determine whether the target switching switch is in a normal working state based on the signal parameters of the pot detection signal. It is not difficult to understand here that in this embodiment, "the target switching switch is in a normal working state" means that the first position end (that is, the normally closed contact) of the target switching switch is not invalid.

[0091] In some possible embodiments, there may be multiple signal parameters for the pot detection signal, and multiple different signal parameters correspond to different specified intervals. For example, the signal parameter may be a signal frequency, and the specified interval may be a frequency interval; for another example, the signal parameter may be a signal period, and the specified interval may be a period interval. The control module may first determine the parameter type of the signal parameter, and then determine the specified interval corresponding to the signal parameter based on a preset period interval mapping table, and determine whether the signal parameter belongs to the corresponding specified interval. Among them, the period interval mapping table represents the correspondence between the parameter types of different signal parameters and different specified intervals.

[0092] In some possible embodiments, step S840 and step S850 may be further included after step S820.

[0093] Step S840: When the signal parameter does not belong to a predetermined specified interval, it is determined that the target switching switch is in an abnormal working state.

[0094] Specifically, the specific implementation manner in which the control module determines whether the signal parameter belongs to the corresponding specified interval is described in detail in the following embodiments.

[0095] Step S850, generate and send alarm information.

[0096] In this embodiment, when the control module determines that the target switching switch is in an abnormal working state, it can generate an alarm message and send the alarm message to the function panel for display, or send the alarm message to a mobile terminal (e.g., a smart phone) that is connected to the electrical device to remind the user to repair the electrical device to ensure the normal use of the electrical device. For example, the content of the alarm message can be "The circuit is faulty, please repair it."

[0097] In some other possible embodiments, when the control module determines that the target switching switch is in an abnormal working state, it can also generate a fault record, which can be stored in the control module, and is used to help maintenance personnel quickly locate the faulty hardware when they perform maintenance. For example, the content of the fault record can be "at XX time, the target switching switch corresponding to coil No. X failed." In addition, in this embodiment, the fault record can also record the specific fault type of the target switching switch, that is, the specific fault type is the failure of the normally closed contact of the target switching switch.

[0098] As another possible implementation, the target switching switch failure may be caused by the overtemperature of the electromagnetic heating circuit where the target switching switch is located. When the control module determines that the target switching switch is in an abnormal working state, it can also re-conduct the branch between the target pot detection module and the target resonance module at specified time intervals, and judge again whether the target switching switch is in a normal working state, that is, the control module re-executes steps S810 to S840. Among them, the specified time length can be a default value in the control module, and can also be adjusted by the R&D personnel based on the cooling time required for the electromagnetic heating circuit. For example, the specified time length can be 30s, 60s, etc.

[0099] The present embodiment provides a control method for electrical equipment. The control module in the method can determine whether the target switching switch is in a normal working state based on the signal parameters of the pot detection signal sent by the target pot detection module. When the target switching switch is in an abnormal working state, the control module can issue an alarm message to remind the user to repair the electrical equipment in time, thereby ensuring the normal use of the electrical equipment.

[0100] See also Fig. 9 , Fig. 9 A control method for an electrical device provided in the second embodiment of the present application is schematically shown. Specifically, the method includes the following process.

[0101] Step S910, controlling the target switching switch to conduct the branch between the target pot detection module and the target resonance module.

[0102] Step S920: acquiring signal parameters of the pot detection signal sent by the target pot detection module.

[0103] Specifically, step S910 and step S920 may refer to the relevant introduction of step S810 and step S820 in the above embodiment, which will not be described in detail here.

[0104] Step S930: When the signal parameter belongs to a predetermined specified interval, it is determined that the target switching switch is in a normal working state.

[0105] As an embodiment, the signal parameter may include a signal frequency, and the specified interval may include a first frequency interval and a second frequency interval, and the lower limit value of the second frequency interval is greater than the upper limit value of the first frequency interval. Therefore, the frequency values ​​in the second frequency interval are all greater than the frequency values ​​in the first frequency interval. 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 frequency value in the second frequency interval may be the signal frequency of the pot detection signal when the resonance module is covered by the pot, and the frequency value in the first frequency interval may be the signal frequency of the pot detection signal when the resonance module is not covered by the pot.

[0106] In some possible embodiments, when performing hardware testing on electrical equipment, R&D personnel can directly connect the pot detection module and the resonance module, and do not place a pot on the target resonance module, thereby obtaining multiple sets of first test data detected by the pot detection module, and summarize the above-mentioned first frequency range based on the multiple sets of first test data. R&D personnel can also directly connect the pot detection module and the resonance module, and place a pot on the target resonance module, thereby obtaining multiple sets of second test data detected by the pot detection module, and summarize the above-mentioned second frequency range based on the multiple sets of second test data.

[0107] In some other possible embodiments, the R&D personnel may obtain the reference frequency f0 of the pot detection module in the electromagnetic heating circuit. The reference frequency f0 refers to the resonant frequency of the pot detection module's own circuit when the pot detection module is not connected to the resonant module, and then determine the first signal frequency fa of the pot detection signal in the pot-free state based on the preset first functional relationship, and determine the second signal frequency fb of the pot detection signal in the pot-without state based on the preset second functional relationship. Among them, fb>fa. Finally, the first frequency interval is determined based on the first signal frequency fa, and the second frequency interval is determined based on the second signal frequency fa. Among them, the first functional relationship and the second functional relationship can be summarized by the R&D personnel based on a large amount of test data. For example, the first frequency interval can be (0.9fa, 1.1fa), and the second frequency interval can be (0.9fb, 1.1fb). This embodiment does not specifically limit the value range of the first frequency interval and the second frequency interval. Specifically, step S930 may include step S9310 and step S9330.

[0108] Step S9310: When the signal frequency belongs to the second frequency interval, it is determined that the target switching switch is in a normal working state and the target resonance module is covered by the cooker.

[0109] Step S9330: When the signal frequency belongs to the first frequency interval, it is determined that the target switching switch is in a normal working state and the target resonance module is not covered by the cooker.

[0110] In this embodiment, the control module can read the pre-stored first frequency interval and the second frequency interval. When the signal frequency belongs to the second frequency interval, the control module determines that the target switching switch is in a normal working state and the target resonance module is covered by the cookware; when the signal frequency belongs to the first frequency interval, the control module determines that the target switching switch is in a normal working state and the target resonance module is not covered by the cookware.

[0111] In some possible embodiments, step S9340 may be further included after step S920.

[0112] Step S9340: When the signal frequency does not belong to the first frequency interval and the second frequency interval, it is determined that the target switching switch is in an abnormal working state.

[0113] As another implementation, the signal parameter may include a signal period, the specified interval may include a first period interval and a second period interval, and the upper limit value of the second period interval is less than the lower limit value of the first period interval. In this embodiment, the first period interval corresponds to the first frequency interval, and the second period interval corresponds to the second frequency interval. When the R&D personnel determine the first frequency interval and the second frequency interval, they can determine the first period interval and the second period interval based on the calculation formula between the period and the frequency. Specifically, step S930 may include step S9350 and step S9370.

[0114] Step S9350: when the signal period belongs to the second period interval, it is determined that the target switching switch is in a normal working state and the target resonance module is covered by the cooker.

[0115] Step S9370: When the signal period belongs to the first period interval, it is determined that the target switching switch is in a normal working state and the target resonance module is not covered by the cooker.

[0116] In this embodiment, the control module can read the pre-stored first cycle interval and the second cycle interval. When the signal cycle belongs to the second cycle interval, the control module determines that the target switching switch is in a normal working state and the target resonance module is covered by the cookware; when the signal cycle belongs to the first cycle interval, the control module determines that the target switching switch is in a normal working state and the target resonance module is not covered by the cookware.

[0117] In some possible embodiments, step S9380 may be further included after step S920.

[0118] Step S9380: When the signal cycle does not belong to the first cycle interval and the second cycle interval, it is determined that the target switching switch is in an abnormal working state.

[0119] The present embodiment provides a control method for electrical equipment. The control module in the method can determine whether the target switching switch is in a normal working state based on the signal parameters of the pot detection signal sent by the target pot detection module. When the target switching switch is in an abnormal working state, the control module can issue an alarm message to remind the user to repair the electrical equipment in time, thereby ensuring the normal use of the electrical equipment.

[0120] See also Fig.10 , Fig.10A 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.

[0121] Step S1010, controlling the target switching switch to conduct the branch between the target pot detection module and the target resonance module.

[0122] Step S1020, obtaining signal parameters of the pot detection signal sent by the target pot detection module.

[0123] Step S1030: When the signal frequency belongs to the second frequency interval, it is determined that the target switching switch is in a normal working state and the target resonance module is covered by the cooker.

[0124] Specifically, steps S1010 to S1030 may refer to the relevant introductions in steps S910 to S9310 in the above embodiments, and will not be described in detail here.

[0125] Step S1040, controlling the target switching switch to turn on the branch between the inverter module and the target resonant module.

[0126] In this embodiment, the control module may send a second control signal to the target switching switch, where the second control signal is used to control the target switching switch to turn on a branch between the inverter module and the target resonant module.

[0127] Step S1050: sending a driving pulse signal to the inverter module.

[0128] In this embodiment, the control module sends a driving pulse signal to the inverter module, so that the inverter module outputs an alternating current to the target resonant module. The driving pulse signal may be a pair of complementary PWM signals.

[0129] Step S1060: acquiring a current detection signal sent by a current detection module connected to the target resonance module.

[0130] In this embodiment, the current detection signal is used to characterize the current change of the branch where the current detection module is located. As an implementation method, the control module can obtain the current detection signal sent by the current detection module connected to the target resonance module at set time intervals. Among them, the set time length can be a default value in the control module, or it can be adjusted by the R&D personnel based on the specific working conditions of the electrical equipment. Exemplarily, the set time length can be 10s, 15s, etc., which is not specifically limited in this embodiment.

[0131] Step S1070: Based on the current detection signal and the drive pulse signal, determine again whether the target switching switch is in a normal working state.

[0132] In this embodiment, when the target switching switch is in a normal working state, the control module can smoothly control the target switching switch so that the branch between the inverter module and the target resonant module is smoothly turned on, so that the inverter module can provide alternating current to the target resonant module. In this case, the current change of the branch where the target resonant module is located and the change of the drive pulse signal are roughly synchronized, that is, the signal frequency of the current detection signal and the signal frequency of the drive pulse signal are roughly the same.

[0133] On the contrary, when the target switching switch is in an abnormal working state, for example, the electromagnetic heating circuit where the target switching switch is located may be overheated, or the branch between the target switching switch and the control module is broken. At this time, the control module cannot control the target switching switch to conduct the branch between the inverter module and the target resonant module, so that the current detection signal and the drive pulse signal will not change synchronously.

[0134] Therefore, when the working state of the target switching switch is unknown, the control module can determine whether the target switching switch is in a normal working state based on the current detection signal and the drive pulse signal. It is not difficult to understand here that in this embodiment, "the target switching switch is in a normal working state" means that the second position end (that is, the normally open contact) of the target switching switch is not invalid. Specifically, step S1070 may include steps S1071 to S1079.

[0135] Step S1071, obtaining a first signal frequency of a driving pulse signal.

[0136] In this embodiment, since the driving pulse signal is a control signal generated inside the control module, the control module can determine the first signal frequency of the driving pulse signal by acquiring the signal parameter of the driving pulse signal.

[0137] Step S1073, obtaining a second signal frequency of the current detection signal.

[0138] In this embodiment, according to Figure 4 It is not difficult to see from part (e) that the current detection signal is a square wave signal. The control module can obtain any two adjacent moments of conversion from low level to high level in the current detection signal, and then determine the duration between the two moments as the signal period of the current detection signal, and determine the inverse of the signal period as the second signal frequency of the current detection signal.

[0139] Step S1075: when the absolute value of the frequency difference between the first signal frequency and the second signal frequency is less than or equal to the specified difference, it is determined that the target switching switch is in a normal working state.

[0140] In this embodiment, when the absolute value of the frequency difference between the first signal frequency and the second signal frequency is less than or equal to the specified difference, the first signal frequency and the second signal frequency are approximately equal, indicating that the control module can smoothly control the target switching switch to turn on the branch between the inverter module and the target resonant module, and the target switching switch is in a normal working state. Among them, the specified difference can be a default value in the control module, and can also be adjusted by R&D personnel based on the specific working conditions of the electrical equipment. For example, the specified difference can be 0.05 times the first signal frequency, which is not specifically limited in this embodiment.

[0141] Step S1077: when the absolute value of the frequency difference between the first signal frequency and the second signal frequency is greater than a specified difference, it is determined that the target switching switch is in an abnormal working state.

[0142] Step S1079, generate and send alarm information.

[0143] Specifically, the specific implementation method of step S1079 can refer to the relevant introduction in step S850, which will not be repeated here.

[0144] In some other possible embodiments, when the control module determines that the target switching switch is in an abnormal working state, it can also generate a fault record, which can be stored in the control module, and is used to help maintenance personnel quickly locate the faulty hardware when they perform maintenance. For example, the content of the fault record can be "at XX time, the target switching switch corresponding to coil No. X failed." In addition, in this embodiment, the fault record can also record the specific fault type of the target switching switch, that is, the specific fault type is the failure of the normally open contact of the target switching switch.

[0145] As another possible implementation, the target switching switch failure may be caused by the excessive temperature of the electromagnetic heating circuit where the target switching switch is located. When the control module determines that the target switching switch is in an abnormal working state, it can also re-convert the branch between the inverter module and the target resonant module at a specified time interval, and judge again whether the target switching switch is in a normal working state, that is, the control module re-executes steps S1040 to S1077. Among them, the specified time length can be a default value in the control module, and can also be adjusted by the R&D personnel based on the cooling time required for the electromagnetic heating circuit. For example, the specified time length can be 30s, 60s, etc.

[0146] In some possible embodiments, steps S1040 to S1079 may be executed by the control module in response to the switch detection indication, and the target switching switch is controlled to conduct the branch between the inverter module and the target resonant module, thereby detecting whether the normally open contact of the target switching switch is in a normal working state. It is not difficult to understand here that there is no sequential execution order between steps S1040 to S1079 in this embodiment and steps S810 to S850 in the above embodiment, that is, the control module may first execute steps S810 to S850 in response to the switch detection indication to detect the normally closed contact of the target switching switch; and then execute steps S1040 to S1079 to detect the normally open contact of the target switching switch. The control module may also first execute steps S1040 to S1079 to detect the normally open contact of the target switching switch; and then execute steps S810 to S850.

[0147] This embodiment provides a control method for electrical equipment. The control module in the method can determine whether the target switching switch is in a normal working state based on the signal frequency of the driving pulse signal and the current detection signal. When the target switching switch is in an abnormal working state, the control module can issue an alarm message to remind the user to repair the electrical equipment in time, thereby ensuring the normal use of the electrical equipment.

[0148] See also Fig.11 , Fig.11 A control device 1100 for an electrical device provided in an embodiment of the present application is schematically shown, and the device 1100 may include a control unit 1110, an acquisition unit 1120, and a determination unit 1130. Among them, the control unit 1110 is used to control the target switching switch to conduct the branch between the target pot detection module and the target resonance module. The acquisition unit 1120 is used to obtain the signal parameters of the pot detection signal sent by the target pot detection module, and the pot detection signal is used to characterize whether the target resonance module is covered by the pot. The determination unit 1130 is used to determine that the target switching switch is in a normal working state when the signal parameter belongs to a predetermined specified interval; the specified interval characterizes the range corresponding to the signal parameter when the target pot detection module and the target resonance module are normally connected.

[0149] In some possible embodiments, the signal parameter includes a signal frequency, the specified interval includes a first frequency interval and a second frequency interval, and the lower limit value of the second frequency interval is greater than the upper limit value of the first frequency interval. The determination unit 1130 is specifically used to determine that the target switching switch is in a normal working state and the target resonance module is covered by the pot when the signal frequency belongs to the second frequency interval. When the signal frequency belongs to the first frequency interval, it is determined that the target switching switch is in a normal working state and the target resonance module is not covered by the pot.

[0150] In some possible embodiments, the device 1100 may also include a sending unit (not shown in the figure) and a signal acquisition unit (not shown in the figure). When the signal frequency belongs to the second frequency interval, the determination unit 1130 determines that the target switching switch is in a normal working state, and after the target resonance module is covered by the cookware, the control unit 1110 is also used to control the target switching switch to turn on the branch between the inverter module and the target resonance module. The sending unit is used to send a drive pulse signal to the inverter module. The signal acquisition unit is used to obtain a current detection signal sent by a current detection module connected to the target 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 determination unit 1130 is also used to determine again whether the target switching switch is in a normal working state based on the current detection signal and the drive pulse signal.

[0151] In some possible embodiments, the determination unit 1130 is specifically used to obtain a first signal frequency of a driving pulse signal; obtain a second signal frequency of a current detection signal; and determine that the target switching switch is in a normal working state when the absolute value of a frequency difference between the first signal frequency and the second signal frequency is less than or equal to a specified difference.

[0152] In some possible embodiments, the device 1100 may further include an alarm unit (not shown in the figure). The determination unit 1130 is specifically used to determine that the target switching switch is in an abnormal working state when the absolute value of the frequency difference between the first signal frequency and the second signal frequency is greater than a specified difference. The alarm unit is used to generate and send alarm information.

[0153] In some possible embodiments, the signal parameter includes a signal period, the specified interval includes a first period interval and a second period interval, and the upper limit value of the second period interval is less than the lower limit value of the first period interval. The determination unit 1130 is specifically used to determine that the target switching switch is in a normal working state and the target resonance module is covered by the pot when the signal period belongs to the second period interval. When the signal period belongs to the first period interval, it is determined that the target switching switch is in a normal working state and the target resonance module is not covered by the pot.

[0154] 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.

[0155] In several embodiments provided in the present application, the coupling between modules may be electrical, mechanical or other forms of coupling.

[0156] 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.

[0157] The present embodiment provides a control device for electrical equipment, in which a control module can determine whether a target switching switch is in a normal working state based on the signal parameters of a pot detection signal sent by a target pot detection module, and when the target switching switch is in an abnormal working state, the control module can issue an alarm message to remind the user to repair the electrical equipment in time, thereby ensuring the normal use of the electrical equipment.

[0158] See also Fig.12 , Fig.12 It is schematically shown that an embodiment of the present application further provides an electrical device 1200, which includes the above-mentioned electromagnetic heating circuit 1201. The specific implementation method of the electromagnetic heating circuit 1201 can refer to the relevant introduction in the above application environment embodiment, and will not be repeated here.

[0159] The control module in the electromagnetic heating circuit 1201 may include one or more processors 1211, a memory 1212, and one or more applications. The one or more applications are stored in the memory 1212 and configured to be executed by the one or more processors 1211, and the one or more applications are configured to execute the method described in the above embodiment.

[0160] The processor 1211 may include one or more processing cores. The processor 1211 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 1212, and calling data stored in the memory 1212. Optionally, the processor 1211 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 1211 can integrate one or more combinations of a central processing unit 1211 (CPU), a graphics processing unit 1211 (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 1211, but may be implemented separately through a communication chip.

[0161] The memory 1212 may include a random access memory 1212 (RAM), and may also include a read-only memory 1212 (ROM). The memory 1212 may be used to store instructions, programs, codes, code sets, or instruction sets. The memory 1212 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.

[0162] See also Fig.13 , Fig.13 It is schematically shown that an embodiment of the present application further provides a computer-readable storage medium 1300, in which computer program instructions 1310 are stored. The computer program instructions 1310 can be called by a processor to execute the method described in the above embodiment.

[0163] The computer-readable storage medium 1300 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 1300 has storage space for computer program instructions 1310 for executing any method steps in the above method. These computer program instructions 1310 may be read from one or more computer program products or may be written into one or more computer program products.

[0164] 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, provided with a signal end and an output end, wherein the output end 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 common end, an active end, a first position end and a second position end, the active end is connected to the common end; the common end is connected to the resonance module, the first position end is connected to the pot detection module; the second position end is connected to the output end of the inverter module; as well as The control module is electrically connected to the signal end of the inverter module, the N switching switches and the N pot detection modules, respectively, and the control module is configured to: control the target switching switch to turn on the branch between the target pot detection module and the target resonance module; obtain the signal parameter of the pot detection signal sent by the target pot detection module, and the pot detection signal is used to indicate whether the target resonance module is covered by the pot; when the signal parameter belongs to a predetermined specified interval, it is determined that the target switching switch is in a normal working state; the specified interval indicates the range corresponding to the signal parameter when the target pot detection module and the target resonance module are normally connected.

2. The electromagnetic heating circuit according to claim 1, characterized in that: The pot detection module includes an oscillation unit, a voltage pull-up unit and a signal comparison unit; The oscillation unit is provided with a detection end, the detection end is connected to the first position end of the switching switch, the detection end is used to output a detection signal, and the detection signal is used to represent the change of the inductance value of the resonance module connected to the oscillation unit; The voltage pull-up unit is connected between the detection end of the oscillation unit and the non-phase input end of the signal comparison unit, and is used to pull up the voltage value of the detection signal; The inverting input terminal of the signal comparison unit is used to input a reference voltage, and the output terminal of the signal comparison unit is connected to the control module to output the pot detection signal to the control module.

3. The electromagnetic heating circuit according to claim 2, characterized in that: The oscillation unit includes a transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and an inductor; The control end of the transistor is connected to the first power supply end through the first resistor and is grounded through the second resistor; the first end of the transistor is connected to the detection end and is connected to the first power supply end through the third resistor; the second end of the transistor is grounded through the fourth resistor; The first capacitor is connected between the first end and the second end of the transistor, the second capacitor and the fourth resistor are connected in parallel, and the third capacitor and the second resistor are connected in parallel; One end of the fourth capacitor and the inductor connected in series is connected to the detection end, and the other end is grounded.

4. The electromagnetic heating circuit according to claim 2, characterized in that: The voltage pull-up unit includes a fifth resistor and a sixth resistor; the fifth resistor is connected between the first power supply terminal and the non-inverting input terminal; one end of the sixth resistor is connected to the non-inverting input terminal, and the other end is grounded.

5. The electromagnetic heating circuit according to claim 4, characterized in that: The voltage pull-up unit further includes a fifth capacitor, one end of which is connected to the detection end of the oscillation unit, and the other end of which is connected to the non-inverting input end.

6. The electromagnetic heating circuit according to claim 2, characterized in that: The signal comparison unit includes a voltage comparator, a seventh resistor and a sixth capacitor; The positive input terminal of the voltage comparator is connected to the voltage pull-up unit, the negative input terminal of the voltage comparator is used to input the reference voltage, and the output terminal of the voltage comparator is connected to the control module; The seventh resistor is connected between the first power supply terminal and the output terminal of the voltage comparator; one end of the sixth capacitor is connected to the output terminal of the voltage comparator, and the other end is grounded.

7. The electromagnetic heating circuit according to claim 2, characterized in that: The pot detection module further includes a seventh capacitor, and the seventh capacitor is connected between the detection end of the oscillation unit and the first position end of the switching switch.

8. The electromagnetic heating circuit according to any one of claims 1 to 7, characterized in that: The electromagnetic heating circuit further includes N current detection modules corresponding to the N resonance modules one by one, and the current detection modules are connected between the common end of the switching switch and the resonance module; The control module is electrically connected to the N current detection modules respectively, and the control module is further configured to: send a driving pulse signal to the inverter module; Obtain a current detection signal sent by a designated current detection module, wherein the current detection signal is used to characterize the current change of the branch where the designated current detection module is located; based on the current detection signal and the drive pulse signal, determine whether the switching switch connected to the designated current detection module is in a normal working state.

9. 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 8, and the method comprises: Control the target switching switch to conduct the branch between the target pot detection module and the target resonance module; Acquire a signal parameter of a pot detection signal sent by the target pot detection module, wherein the pot detection signal is used to indicate whether the target resonance module is covered by a pot; When the signal parameter belongs to a predetermined specified interval, it is determined that the target switching switch is in a normal working state; the specified interval represents the range corresponding to the signal parameter when there is normal conduction between the target pot detection module and the target resonance module.

10. The method according to claim 9, characterized in that The signal parameter includes a signal frequency, the designated interval includes a first frequency interval and a second frequency interval, and a lower limit value of the second frequency interval is greater than an upper limit value of the first frequency interval; When the signal parameter belongs to a predetermined specified interval, determining that the target switching switch is in a normal working state includes: When the signal frequency belongs to the second frequency interval, it is determined that the target switching switch is in a normal working state and the target resonance module is covered by the cooker; When the signal frequency belongs to the first frequency interval, it is determined that the target switching switch is in a normal working state and the target resonance module is not covered by the cooker.

11. The method according to claim 10, characterized in that In the case where the signal frequency belongs to the second frequency interval, it is determined that the target switching switch is in a normal working state, and after the target resonance module is covered by the cooker, the method further includes: Controlling the target switching switch to conduct a branch between the inverter module and the target resonant module; Sending a drive pulse signal to the inverter module; Acquire a current detection signal sent by a current detection module connected to the target resonance module, wherein the current detection signal is used to characterize a current change in a branch where the current detection module is located; Based on the current detection signal and the drive pulse signal, it is determined again whether the target switching switch is in a normal working state.

12. The method according to claim 11, characterized in that The step of determining again whether the target switching switch is in a normal working state based on the current detection signal and the drive pulse signal includes: Acquiring a first signal frequency of the driving pulse signal; Acquiring a second signal frequency of the current detection signal; When the absolute value of the frequency difference between the first signal frequency and the second signal frequency is less than or equal to a specified difference, it is determined that the target switching switch is in a normal working state.

13. The method according to claim 12, characterized in that The method further comprises: When the absolute value of the frequency difference between the first signal frequency and the second signal frequency is greater than the specified difference, determining that the target switching switch is in an abnormal working state; Generate and send alarm messages.

14. The method according to claim 9, characterized in that The signal parameter includes a signal period, the specified interval includes a first period interval and a second period interval, and the upper limit value of the second period interval is less than the lower limit value of the first period interval; When the signal parameter belongs to a predetermined specified interval, determining that the target switching switch is in a normal working state includes: When the signal period belongs to the second period interval, it is determined that the target switching switch is in a normal working state and the target resonance module is covered by the cooker; When the signal period belongs to the first period interval, it is determined that the target switching switch is in a normal working state and the target resonance module is not covered by the cooker.

15. A control device for an electrical device, characterized in that: The electrical equipment comprises the electromagnetic heating circuit according to any one of claims 1 to 8, and the device comprises: A control unit, used for controlling a target switching switch to conduct a branch between a target pot detection module and a target resonance module; an acquisition unit, configured to acquire a signal parameter of a pot detection signal sent by the target pot detection module, wherein the pot detection signal is used to indicate whether the target resonance module is covered by the pot; A determination unit is used to determine that the target switching switch is in a normal working state when the signal parameter belongs to a predetermined specified interval; the specified interval represents the range corresponding to the signal parameter when there is normal conduction between the target pot detection module and the target resonance module.

16. An electrical device, characterized in that: The electrical device comprises the electromagnetic heating circuit according to any one of claims 1 to 8, 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 perform the method according to any one of claims 9 to 14.

17. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and the computer program instructions can be called by a processor to execute the method according to any one of claims 9 to 14.

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