Control method and apparatus for electromagnetic heating circuit, and electromagnetic heating circuit

Abstract

The present application discloses a control method and apparatus for an electromagnetic heating circuit, and an electromagnetic heating circuit. The electromagnetic heating circuit comprises a power module, a resonant module, a driving module, and a control module. The resonant module is connected to the power module, and the resonant module comprises a heating coil, a first resonant capacitor, N second resonant capacitors, a first switch, and N second switches. The first resonant capacitor and the N second resonant capacitors are respectively connected in parallel to the heating coil, and the N second switches are connected on a one-to-one basis to branches where the N second resonant capacitors are located; the driving module is connected to a control end of the first switch; and the control module is connected to the driving module and the N second switches. As the control module can control whether or not to connect the N second resonant capacitors to the resonant module by controlling the on-off states of the N second switches, the more second resonant capacitors that are connected, the larger the equivalent capacitance of the resonant capacitor is, expanding the LC resonant parameters of the electromagnetic heating circuit, and thereby improving the heating power.

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to Chinese patent application No. 202211718278.3 filed at China National Intellectual Property Administration (CNIPA) on December 29, 2022 and entitled " METHOD AND APPARATUS FOR CONTROLLING ELECTROMAGNETIC HEATING CIRCUIT, AND ELECTROMAGNETIC HEATING CIRCUIT", the disclosure of which is hereby incorporated by reference in its entirety.TECHNICAL FIELD

[0002] The application relates to the technical field of electromagnetic heating, and in particular to a method and apparatus for controlling an electromagnetic heating circuit, and an electromagnetic heating circuit.BACKGROUND

[0003] An induction cooker is a cooking appliance made with a principle of electromagnetic induction-heating. When the induction cooker is in an operation state, an Insulated Gate Bipolar Transistor (IGBT) is switched on first, so that a heating coil in the induction cooker is in a charging state. After charging of the heating coil finishes, the IGBT is turned off, so that the heating coil charges a resonant capacitor connected in parallel with it. At this time, the heating coil and the resonant capacitor are in a high-frequency resonance state, and a high-frequency alternating current on the heating coil may form an alternating magnetic field, so that an eddy current effect is generated at bottom of a metal cookware in contact with the induction cooker, and finally, heating of food ingredients in the cookware is implemented.

[0004] However, existing induction cookers often use a fixed LC resonant parameter, resulting in that heating power of the induction cookers during operation falls in a fixed power interval.SUMMARY

[0005] Embodiments of the application provide a method and apparatus for controlling an electromagnetic heating circuit, and an electromagnetic heating circuit.

[0006] According to a first aspect, some embodiments of the application provide an electromagnetic heating circuit, the electromagnetic heating circuit comprises a power module, a resonance module, a driving module and a control module. The resonance module is connected to the power module, and the resonance module comprises a heating coil, a first resonant capacitor, N second resonant capacitors, a first switch and N second switches, N is equal to or greater than 1. The heating coil, the first switch and the power module are sequentially connected in series, to form a current loop; the first resonant capacitor and the N second resonant capacitors are connected in parallel with the heating coil respectively, and each of the N second switches is connected in one-to-one correspondence to a branch where a respective one of the N second resonant capacitors is located. The driving module is connected to a control end of the first switch. The control module is connected to the driving module, and the control module is configured to control heating power of the electromagnetic heating circuit by controlling switching states of the N second switches.

[0007] According to a second aspect, some embodiments of the application further provide an appliance device, the appliance device comprises a housing and the above-mentioned electromagnetic heating circuit.

[0008] According to a third aspect, some embodiments of the application further provide a method for controlling an electromagnetic heating circuit, the method is applied to the above-mentioned electromagnetic heating circuit, and the method comprises the following operations. A desired heating power of the electromagnetic heating circuit is acquired. Target switching states of the second switches are determined based on the desired heating power. An actual heating power of the electromagnetic heating circuit is controlled based on the target switching states, so that the actual heating power approaches the desired heating power.

[0009] According to a fourth aspect, some embodiments of the application further provide an apparatus for controlling an electromagnetic heating circuit, the apparatus is applied to the above-mentioned electromagnetic heating circuit, the apparatus comprises an acquisition module, a determination module and a control module. The acquisition module is configured to acquire a desired heating power of the electromagnetic heating circuit. The determination module is configured to determine target switching states of the second switches based on the desired heating power. The control module is configured to control an actual heating power of the electromagnetic heating circuit based on the target switching states, so that the actual heating power approaches the desired heating power.

[0010] According to a fifth aspect, some embodiments of the application further provide an electromagnetic heating circuit, the electromagnetic heating circuit comprises one or more processors, a memory, and one or more applications. The one or more applications are stored in the memory, are configured to be executed by the one or more processors, and are configured to perform the above-mentioned method.

[0011] According to a sixth aspect, an embodiment of the application further provides a computer-readable storage medium, the computer-readable storage medium has stored thereon computer program instructions. The computer program instructions may be called by a processor to perform the above-mentioned method.

[0012] According to a seventh aspect, an embodiment of the application further provides a computer program product, the computer program product implements the above-mentioned method when it is executed.BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to explain technical solutions in the embodiments of the application more clearly, drawings required to be used in descriptions of the embodiments will be briefly introduced below. It is apparent that the drawings described below are only some embodiments of the application, and other drawings may also be obtained by those skilled in the art according to these drawings without paying any creative work. FIG. 1 is a schematic structural diagram of an appliance device provided in an embodiment of the application. FIG. 2 is a schematic structural diagram of an electromagnetic heating circuit in FIG. 1. FIG. 3 is another schematic structural diagram of the electromagnetic heating circuit in FIG. 1. FIG. 4 is a schematic flowchart of a method for controlling an electromagnetic heating circuit provided in a first embodiment of the application. FIG. 5 is a schematic flowchart of a method for controlling an electromagnetic heating circuit provided in a second embodiment of the application. FIG. 6 is a schematic waveform diagram of a driving voltage provided in an embodiment of the application. FIG. 7 is a block diagram of modules of an apparatus for controlling an electromagnetic heating circuit provided in an embodiment of the application. FIG. 8 is a block diagram of modules of an electromagnetic heating circuit provided in an embodiment of the application. FIG. 9 is a block diagram of modules of a computer-readable storage medium provided in an embodiment of the application. DETAILED DESCRIPTION

[0014] In order to enable those skilled in the art to understand solutions of the application better, the technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. It is apparent that the described embodiments are only part of the embodiments of the application, rather than all of the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without paying any creative work belong to the scope of protection of the application.

[0015] An electromagnetic heating circuit, an appliance device, and a control method applied to the electromagnetic heating circuit proposed in the application will be further described below with reference to specific implementations and the drawings.

[0016] With reference to FIG. 1, an embodiment of the application provides an electromagnetic heating circuit 100 and an appliance device 200 equipped with the electromagnetic heating circuit 100. The appliance device 200 may be an device operating based on a principle of electromagnetic heating (for example, an induction cooker, an electromagnetic multi-burner stove, an electromagnetic heating rice cooker, etc.).

[0017] In the embodiment of the application, the appliance device 200 comprises a housing 210, a function panel 230, and the above-mentioned electromagnetic heating circuit 100. The function panel 230 is arranged on an outer surface of the housing 210, and is configured to receive a user's control operation. The electromagnetic heating circuit 100 is arranged in the housing 210 and is electrically connected to the function panel 230, and then operation parameters of the electromagnetic heating circuit 100 are adjusted according to different control operations received by the function panel 230.

[0018] In the embodiment, the housing 210 comprises a first housing 212 and a second housing 214, the first housing 212 and the second housing 214 cover each other to form an accommodation space for arranging the electromagnetic heating circuit 100, that is, the housing 210 plays a role of protecting and accommodating parts in the electromagnetic heating circuit 100. The first housing 212 is provided with a fixing structure therein, and the fixing structure is configured to fix a part of structures of the electromagnetic heating circuit 100 (for example, a circuit board). Specifically, the fixing structure comprises, but is not limited to a fixing groove, a clamping member (for example, an elastic buckle), or other structures. An outer surface of the second housing 120 is provided with a mounting groove, and the installation groove is configured to mount the function panel 230.

[0019] The function panel 230 is mounted on the outer surface of the second housing 120. Specifically, the function panel 230 may include multiple function switches, such as a power startup switch, a heating function startup switch, a heating power switching switch, etc. In case that the function panel 230 receives the user's control operation, the function panel 230 converts the control operation into a corresponding electrical signal and then sends the electrical signal to the electromagnetic heating circuit 100, then the electromagnetic heating circuit 100 determines a corresponding operation mode based on the electrical signal. Exemplarily, if a selection switch of a high-power heating mode on the function panel 230 receives the user's turn-on operation, the function panel 230 generates a corresponding electrical signal and sends the electrical signal to a control module (for example, a Micro Controller Unit (MCU)) of the electromagnetic heating circuit 100. In case that the electromagnetic heating circuit 100 receives the above-mentioned electrical signal, the electromagnetic heating circuit 100 determines that it needs to enter the high-power heating mode at present.

[0020] With reference to FIG. 2, the electromagnetic heating circuit 100 comprises a power module 10, a resonance module 30, a driving module 50 and a control module 70. The resonance module 30 is connected to the power module 10, and the resonance module 30 comprises a heating coil 310, a first resonant capacitor 320, N second resonant capacitors 330, a first switch 340 and N second switches 350, N is equal to or greater than 1. Specifically, the heating coil 310, the first switch 340 and the power module 10 are sequentially connected in series, to form a current loop. The first resonant capacitor 320 and the N second resonant capacitors 330 are connected in parallel with the heating coil 310 respectively, and each of the N second switches 350 is connected in one-to-one correspondence to a branch where a respective one of the N second resonant capacitors 330 is located. The driving module 50 is connected to a control end 341 of the first switch 340. The control module 70 is connected to the driving module 50 and the N second switches 350, and the control module is configured to control heating power of the electromagnetic heating circuit 100 by controlling switching states of the N second switches 350.

[0021] Since in the embodiment, the resonance module 30 comprises the first resonant capacitor 320 and the N second resonant capacitors 330 connected in parallel at two ends of the heating coil 310, the control module 70 may control whether the N second resonant capacitors 330 join in the resonance module 30 by controlling the switching states of the N second switches 350 respectively. Since in case that more second resonant capacitors 330 join in the resonance module 30, an equivalent capacitance of the resonant capacitors may be increased, that is, an LC resonant parameter of the electromagnetic heating circuit 100 is expanded, thereby improving heating power of the appliance device 200 (for example, an induction cooker) equipped with the electromagnetic heating circuit 100, and widening a heating power interval of the induction cooker.

[0022] Each module in the electromagnetic heating circuit 100 provided in the embodiment of the application will be introduced below with reference to FIG. 2 and FIG. 3.

[0023] The power module 10 provides electric energy for the resonance module 30. In FIG. 3, the power module 10 may include a full-wave rectifier bridge BD1, a first inductor L1 and a first capacitor C1. A signal input end of the full-wave rectifier bridge BD1 is configured to input an alternating current (AC) (for example, utility power), and the full-wave rectifier bridge BD1 is configured to rectify the input AC, that is, convert the AC into direct current (DC). The first inductor L1 and the first capacitor C1 form an LC filter circuit 15 which is connected between a signal output end of the full-wave rectifier bridge BD1 and the resonance module 30, and is configured to filter the DC output by the full-wave rectifier bridge BD1 and transmit the filtered DC to the resonance module 30, thereby reducing interference of a signal noise in the DC to the resonance module 30.

[0024] The resonance module 30 is connected between the power module 10 and the driving module 50, and is configured to store a DC voltage output by the power module 10 and convert the DC voltage into a high-frequency AC, thereby generating an eddy current effect. In the embodiment, the resonance module 30 may include a heating coil 310, a first resonant capacitor 320, N second resonant capacitors 330, a first switch 340 and N second switches 350, N is equal to or greater than 1. The heating coil 310, the first switch 340 and the power module 10 are sequentially connected in series, to form a current loop. In the embodiment shown in FIG. 3, an end of the heating coil 310 is connected to a first voltage output end 120 of the power module 10, another end of the heating coil 310 is connected to a first connection end 343 of the first switch 340, and a second connection end 345 of the first switch 340 is connected to a second voltage output end 140 of the power module 10.

[0025] Specifically, the heating coil 310 may be an inductance coil. The first switch 340 may be an Insulated Gate Bipolar Transistor (IGBT), the IGBT is a power semiconductor field-controlled self-shutoff device. In the embodiment, a collector of the IGBT (i.e., the first connection end 343) is connected to the heating coil 310, an emitter of the IGBT (i.e., the second connection end 345) is connected to the power module 10, and a gate of the IGBT (i.e., the control end 341) is connected to the driving module 50 to receive an output voltage sent by the driving module 50.

[0026] The first resonant capacitor 320 and the N second resonant capacitors 330 are connected in parallel with the heating coil 310 respectively, and each of the N second switches 350 is connected in one-to-one correspondence to a branch where a respective one of the N second resonant capacitors 330 is located. Since in the embodiment, the N second resonant capacitors 330 are connected in parallel with the first resonant capacitor 320, a number of the second resonant capacitors 330 connected in parallel with the first resonant capacitor 320 may be adjusted by controlling switching states of the N second switches 350 corresponding to the N second resonant capacitors 330. Specifically, the more the number of the second resonant capacitors 330 join in, the greater the equivalent capacitance after multiple second resonant capacitors 330 are connected in parallel with the first resonant capacitor 320, that is, the LC resonant parameter of the electromagnetic heating circuit 100 is expanded, so that the electromagnetic heating circuit 100 has a higher heating power.

[0027] Specifically, each of the first resonant capacitor 320 and the second resonant capacitor 330 may be a voltage-resistant capacitor. The second switch 350 may be a switching transistor, such as a Bipolar Junction Transistor (BJT), a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or the like, which is not specifically limited in the embodiment. In the embodiment, control ends of the N second switches 350 are connected to the control module 70 respectively, to receive a control signal sent by the control module 70. In some embodiments, the control signal may be a high-level signal, and the second switch 350 enters a closed state after receiving the high-level signal. In some other embodiments, the control signal may be a low-level signal, and the second switch 350 enters an opened state after receiving the low-level signal. Specifically, specific values of the high-level signal and the low-level signal are determined by a type of the switching transistor, which is not specifically limited in the embodiment.

[0028] In the embodiment, N may be equal to 1, that is, the number of the second resonant capacitor 330 and the number of the second switch 350 are one respectively. With reference to FIG. 3, one second resonant capacitor 330 and one second switch 350 are connected in series and then connected in parallel at two ends of the first resonant capacitor 320.

[0029] The control module 70 is connected to the N second switches 350. The control module 70 may be an MCU, or may be implemented by other control chips, which is not specifically limited in the embodiment. Specifically, the control module 70 is configured to control the heating power of the electromagnetic heating circuit 100 by controlling switching states of the N second switches 350. Specifically, the control module 70 may send N control signals (for example, high and low level signals) to the N second switches 350 in one-to-one correspondence, to control corresponding second switches 350 to enter a closed state or an opened state, thereby adjusting the heating power of the electromagnetic heating circuit 100.

[0030] The driving module 50 is connected between the first switch 340 in the resonance module 30 and the control module 70, and is configured to output a driving voltage to the control end 341 of the first switch 340 with control of the control module 70, and the driving voltage is configured to control the first switch 340 to be in an ON state. A magnitude of the driving voltage may be determined according to a type and specific model of the first switch 340, which is not specifically limited in the embodiment. In some possible embodiments, the driving voltage may be greater than 15V and less than 20V, for example, the driving voltage is 18V.

[0031] In the embodiment, the driving module 50 may include multiple driving units 510, each of multiple driving units 510 is provided with an end connected to the control module 70 and another end connected to the control end 341 of the first switch 340, and driving voltages output by multiple driving units 510 are different from each other. Specifically, the driving unit 510 may be a dedicated driving chip, or a driving circuit comprising multiple power electronic components. In the embodiment, the control module 70 may control multiple driving units 50 to sequentially output driving voltages in a time sequence, and voltage values of multiple driving voltages are gradually increased (that is, driven by a step voltage), which may reduce a hard turn-on loss of the electromagnetic heating circuit 100 in case that an LC resonant energy is small, thereby further reducing the heating power of the electromagnetic heating circuit 100, and achieving low-power heating of the electromagnetic heating circuit 100.

[0032] In the embodiment shown in FIG. 3, multiple driving units 510 may comprise a first driving unit 512 and a second driving unit 514. A first driving voltage output by the first driving unit 512 is greater than a second driving voltage output by the second driving unit 514. In some possible embodiments, the first driving voltage output by the first driving unit 512 may be greater than 15V and less than 20V, for example, the first driving voltage is 18V; the second driving voltage output by the second driving unit 514 may be greater than 7V and less than 12V, for example, the second driving voltage is 9V.

[0033] In the embodiment, the control module 70 is also connected to the driving module 50. In case that the driving module 50 comprises multiple driving units 510, the control module 70 is further configured to control a heating efficiency of the electromagnetic heating circuit 100 by controlling the switching states of the second switches 350 and an operation mode of the driving module 50. The driving module 50 outputs different driving voltages to the first switch 340 in different operation modes. Specifically, the driving module 50 may directly output a constant driving voltage to the first switch 340, this driving voltage is also a rated turn-on voltage of the first switch 340, to achieve hard turn-on of the first switch 340. The driving module 50 may also output one or more driving voltages which is less than the rated turn-on voltage of the first switch 340 to the first switch 340 first, these driving voltages may control the first switch 340 to enter a pre-ON state, and in the pre-ON state, the first switch 340 may enter a discharge state; the driving module 50 outputs a corresponding rated turn-on voltage of the first switch 340 to the first switch 340, after the first switch 340 enters the discharge state for a period of time. That is, the driving module 50 uses a step voltage driving method to turn on the first switch 340, which may reduce the hard turn-on loss of the electromagnetic heating circuit 100 in case that the LC resonant energy is small, thereby further reducing the heating power of the electromagnetic heating circuit 100, and achieving low-power heating of the electromagnetic heating circuit 100.

[0034] In some other embodiments, N may be equal to 1, and multiple driving units 510 may comprise a first driving unit 512 and a second driving unit 514. In this case, the control module 70 is further configured to: control the second switch 350 to be closed, and control the driving module 50 to be in a first operation mode, so that the heating power of the electromagnetic heating circuit 100 belongs to a first power interval; control the second switch 350 to be opened, and control the driving module 50 to be in the first operation mode, so that the heating power of the electromagnetic heating circuit 100 belongs to a second power interval; and control the second switch 350 to be opened, and control the driving module 50 to be in a second operation mode, so that the heating power of the electromagnetic heating circuit 100 belongs to a third power interval. A lower limit of the first power interval is greater than an upper limit of the second power interval, and a lower limit of the second power interval is greater than an upper limit of the third power interval. The first operation mode refers to an operation mode in which the first driving unit 512 outputs the first driving voltage to the first switch 340 in a specified period. The second operation mode refers to an operation mode in which the second driving unit 514 outputs the second driving voltage to the first switch 340 in a first time period of the specified period, and the first driving unit outputs the first driving voltage to the first switch 340 in a second time period of the specified period, and the first time period is earlier than the second time period. Specifically, a specific operation process of the control module 70 will be described in detail in the following method embodiment.

[0035] The embodiment provides an electromagnetic heating circuit 100. Since the resonance module 30 in the electromagnetic heating circuit 100 comprises the first resonant capacitor 320 and the N second resonant capacitors 330 connected in parallel at two ends of the heating coil 310, the control module 70 may control whether the N second resonant capacitors 330 join in the resonance module 30 by controlling the switching states of the N second switches 350 respectively. Since in case that more second resonant capacitors 330 join in the resonance module 30, an equivalent capacitance of the resonant capacitors may be increased, that is, an LC resonant parameter of the electromagnetic heating circuit 100 is expanded, thereby improving heating power of the appliance device 200 (for example, an induction cooker) equipped with the electromagnetic heating circuit 100, and widening a heating power interval of the induction cooker.

[0036] A control method applied to the above-mentioned electromagnetic heating circuit 100 will be introduced below.

[0037] With reference to FIG. 4, FIG. 4 schematically shows a method for controlling an electromagnetic heating circuit provided in a first embodiment of the application. The control method may comprise the following operations S410 to S430.

[0038] In operation S410, a desired heating power of the electromagnetic heating circuit is acquired.

[0039] In the embodiment, the control module in the electromagnetic heating circuit may establish an electrical connection with the function panel on the appliance device, and receive the electrical signal sent by the function panel. The electrical signal may be generated by pressing a button on the function panel or by turning a knob on the function panel. As an implementation, a heating power mapping table may be stored in the control module, and the operation mode mapping table is configured to characterize a mapping relationship between different desired heating powers and different heating modes on the function panel. In case that the control module receives the electrical signal sent by the function panel, the control module determines a corresponding heating mode based on the electrical signal, and then determines the desired heating power of the electromagnetic heating circuit based on the above-mentioned heating power mapping table. The desired heating power is also a target heating power which characterizes a heating power that the electromagnetic heating circuit needs to achieve after operating for a period of time.

[0040] In some embodiments, a heating mode may be pre-set in the control module, and the heating mode characterizes corresponding desired heating powers in different heating moments. In case that the control module determines the heating mode, the control module determines the desired heating power through pre-stored heating parameters.

[0041] In operation S420, target switching states of second switches are determined based on the desired heating power.

[0042] In the embodiment, the target switching states may be a closed state and an opened state. Since the more the number of the second switches in the closed state, the more the number of the second resonant capacitors connected in parallel with the first resonant capacitor, that is, the greater the equivalent capacitance of the resonant capacitors in the electromagnetic heating circuit, so that the electromagnetic heating circuit has a higher actual heating power. Therefore, in case that the desired heating power is greater, if the control module needs to make the actual heating power approach the desired heating power, the control module controls more second switches to be in the closed state.

[0043] As an implementation, a switching state mapping table may be pre-stored in the control module, and the switching state mapping table characterizes target switching states of one or more second switches in different heating power intervals. The control module may determine a corresponding heating power interval based on the desired heating power first, and then determine switching states of the second switches based on the switching state mapping table. An example where the number of the second switch is one is taken, then the switching state mapping table may be shown in Table 1. Table 1heating power intervalsecond switch(2000W, 3500W]closed state[300W, 2000W]opened state

[0044] An interval corresponding to (2000W, 3500W] is recorded as a first interval, and an interval corresponding to [300W, 2000W] is recorded as a second interval, and an upper limit of the second interval is less than a lower limit of the first interval.

[0045] Exemplarily, in case that the desired heating power is 1000W, the control module determines that the target switching state of the second switch is the opened state; in case that the desired heating power is 3000W, the control module determines that the target switching state of the second switch is the closed state.

[0046] In operation S430, an actual heating power of the electromagnetic heating circuit is controlled based on the target switching states, so that the actual heating power approaches the desired heating power.

[0047] In the embodiment, the control module may generate corresponding control signals based on the target switching states of the second switches, control the second switches based on the control signals, and further control the actual heating power of the electromagnetic heating circuit, so that the actual heating power approaches the desired heating power.

[0048] Similarly, an example where the number of the second switch is one is taken, in case that the desired heating power is 1000W, the target switching state of the second switch determined based on Table 1 is the opened state, and the control module generates a low-level signal and sends the low-level signal to the second switch. At this time, only the first resonant capacitor joins in the electromagnetic heating circuit, that is, the equivalent capacitance of the resonant capacitor is small, energy of an LC resonant circuit is reduced, and the actual heating power of the electromagnetic heating circuit is reduced. In case that the desired heating power is 3000W, the target switching state of the second switch determined based on Table 1 is the closed state, and the control module generates a high-level signal and sends the high-level signal to the second switch. At this time, the second resonant capacitor is connected in parallel with the first resonant capacitor, and joins in the electromagnetic heating circuit, that is, the equivalent capacitance of the resonant capacitors is increased, that is, the LC resonant parameter of the electromagnetic heating circuit is expanded, and the actual heating power of the electromagnetic heating circuit is increased.

[0049] The application provides a method for controlling an electromagnetic heating circuit, which controls whether N second resonant capacitors join in the resonant module by controlling switching states of N second switches. Since in case that more second resonant capacitors join in the resonance module, the equivalent capacitance of the resonant capacitors may be increased, that is, the LC resonant parameter of the electromagnetic heating circuit is expanded, thereby improving heating power of the appliance device equipped with the electromagnetic heating circuit.

[0050] With reference to FIG. 5, FIG. 5 schematically shows a method for controlling an electromagnetic heating circuit provided in a second embodiment of the application. The control method may comprise the following operations S510 to S540.

[0051] In operation S510, a desired heating power of the electromagnetic heating circuit is acquired.

[0052] In operation S520, target switching states of second switches are determined based on the desired heating power.

[0053] Specific implementations of operations S510 and S520 may refer to detailed descriptions of operations S410 and S420 respectively, which are not elaborated one by one here.

[0054] In operation S530, a target operation mode of a driving module is determined based on the desired heating power.

[0055] The target operation mode refers to an output mode of the driving voltage, and multiple driving units comprise a first driving unit and a second driving unit. In some embodiments, the target operation mode may comprise a first operation mode, and the driving module in the first operation mode may output a constant first driving voltage to the first switch through the first driving unit in a specified period, here the first driving voltage may be the rated turn-on voltage of the first switch (for example, 18V), and the specified period is a period of closing the first switch. With reference to FIG. 6, FIG. 6 shows a schematic waveform diagram of a driving voltage. Part (a) of FIG. 6 shows a waveform diagram of the driving voltage output by the driving module in case that the target operation mode is the first operation mode.

[0056] It should be noted here that in case that the driving module is in the first operation mode, a turn-on loss of the first switch is great, so that the actual heating power of the electromagnetic heating circuit is great. Exemplarily, the actual heating power of the electromagnetic heating circuit is often greater than 1000W. Therefore, the control module may determine that the target operation mode of the driving module is the first operation mode, in case that the desired heating power is greater than a specified threshold (for example, 1000W).

[0057] In some other embodiments, the target operation mode may comprise a second operation mode, and the driving module in the second operation mode may output a step-shaped driving voltage to the first switch in a specified period, and a peak value of the step-shaped driving voltage is the first driving voltage (that is, the rated turn-on voltage of the first switch). With reference to FIG. 6 again, part (b) of FIG. 6 shows a schematic waveform diagram of a step-shaped driving voltage. Specifically, the driving module outputs a second driving voltage (for example, 9V) to the first switch through the second driving unit in a first time period of the specified period, and outputs a first driving voltage to the first switch through the first driving unit in a second time period of the specified period. Specifically, the first time period is earlier than the second time period, and a duration corresponding to the first time period may be the same as or different from a duration corresponding to the second time period, which is not specifically limited in the embodiment.

[0058] It is not difficult to understand that since the second driving voltage is less than the first driving voltage, and the first driving voltage is the rated turn-on voltage of the first switch, the first time period may be understood as a driving discharge time of the first switch, and the second time period is a time of normally closing the second switch. Since the first switch enters a pre-ON state when the driving module outputs the second driving voltage, the first switch enters a discharge state at this time, thereby reducing the turn-on loss of the first switch. Compared to the first operation mode, when the first switch is driven by a driving voltage in the second operation mode, the actual heating power of the electromagnetic heating circuit may be reduced due to a lower turn-on loss of the first switch, that is, the actual heating power of the electromagnetic heating circuit may be less than 1000W. Therefore, the control module may determine that the target operation mode of the driving module is the second operation mode in case that the desired heating power is less than the specified threshold.

[0059] It should be noted here that there is no time sequence between operations S520 and S530 when they are performed, that is, operation S520 may be performed earlier than operation S530, or may be performed later than operation S530, or may be performed at the same time as operation S530.

[0060] In operation S540, an actual heating power of the electromagnetic heating circuit is controlled based on the target switching states and the target operation mode, so that the actual heating power approaches the desired heating power.

[0061] In the embodiment, the control module may generate corresponding control signals based on the target switching states, and control the second switches based on the control signals. The control module may also determine a driving voltage output by the driving module based on the target operation mode, and then send the driving voltage to the first switch.

[0062] In some embodiments, operation S540 may specifically comprise the following operations S5410 to S5430.

[0063] In operation S5410, the second switch is controlled to be closed, and the driving module is controlled to be in a first operation mode, so that the actual heating power of the electromagnetic heating circuit belongs to a first power interval.

[0064] In the embodiment, the first operation mode refers to an operation mode in which the first driving unit outputs the first driving voltage to the first switch in a specified period. The first power interval may be an interval greater than 2000W and less than 3500W.

[0065] As an implementation, the control module may send a high-level signal to the second switch, to control the second switch to be closed, and control the first driving unit in the driving module to output the first driving voltage to the first switch in a specified period, so that the actual heating power of the electromagnetic heating circuit belongs to the first power interval.

[0066] In operation S5420, the second switch is controlled to be opened, and the driving module is controlled to be in the first operation mode, so that the actual heating power of the electromagnetic heating circuit belongs to a second power interval.

[0067] In the embodiment, a lower limit of the first power interval is greater than an upper limit of the second power interval. The second power interval may be an interval greater than 1000W and less than 2000W.

[0068] As an implementation, the control module may send a low-level signal to the second switch, to control the second switch to be opened, and control the first driving unit in the driving module to output the first driving voltage to the first switch in a specified period, so that the actual heating power of the electromagnetic heating circuit belongs to the second power interval.

[0069] In operation S5430, the second switch is controlled to be opened, and the driving module is controlled to be in a second operation mode, so that the actual heating power of the electromagnetic heating circuit belongs to a third power interval.

[0070] In the embodiment, the second operation mode refers to an operation mode in which the second driving unit outputs the second driving voltage to the first switch in a first time period of the specified period, and the first driving unit outputs the first driving voltage to the first switch in a second time period of the specified period. A lower limit of the second power interval is greater than an upper limit of the third power interval. The third power interval may be an interval greater than 300W and less than 1000W.

[0071] As an implementation, the control module may send a low-level signal to the second switch, to control the second switch to be opened, and control the second driving unit in the driving module to output the second driving voltage to the first switch in the first time period of the specified period, and control the first driving unit in the driving module to output the first driving voltage to the first switch in the second time period of the specified period, so that the actual heating power of the electromagnetic heating circuit belongs to the third power interval.

[0072] The embodiment may dynamically adjust the actual heating power of the electromagnetic heating circuit by controlling the switching state of the second switch and a voltage waveform of the driving voltage output by the driving module. Specifically, the electromagnetic heating circuit may achieve continuous power heating of 300W to 3000W, widening a heating power range of the electromagnetic heating circuit.

[0073] With reference to FIG. 7, FIG. 7 schematically shows an apparatus 700 for controlling an electromagnetic heating circuit provided in an embodiment of the application, and the control apparatus 700 is applied to the above-mentioned electromagnetic heating circuit 100. In the embodiment, the control apparatus 700 may comprise an acquisition module 710, a determination module 720 and a control module 730. The acquisition module 710 is configured to acquire a desired heating power of the electromagnetic heating circuit. The determination module 720 is configured to determine target switching states of the second switches based on the desired heating power. The control module 730 is configured to control an actual heating power of the electromagnetic heating circuit based on the target switching states, so that the actual heating power approaches the desired heating power.

[0074] In some embodiments, the control apparatus 700 may further comprise a mode determination module (not shown in the figure). The mode determination module is configured to determine a target operation mode of the driving module based on the desired heating power. The control module 730 is further configured to control the actual heating power of the electromagnetic heating circuit based on the target switching states and the target operation mode, so that the actual heating power approaches the desired heating power.

[0075] In some embodiments, the control module 730 is further configured to: control the second switch to be closed, and control the driving module to be in a first operation mode, so that the actual heating power of the electromagnetic heating circuit belongs to a first power interval; control the second switch to be opened, and control the driving module to be in the first operation mode, so that the actual heating power of the electromagnetic heating circuit belongs to a second power interval; and control the second switch to be opened, and control the driving module to be in a second operation mode, so that the actual heating power of the electromagnetic heating circuit belongs to a third power interval. A lower limit of the first power interval is greater than an upper limit of the second power interval, and a lower limit of the second power interval is greater than an upper limit of the third power interval; the first operation mode refers to an operation mode in which the first driving unit outputs the first driving voltage to the first switch in a specified period; the second operation mode refers to an operation mode in which the second driving unit outputs the second driving voltage to the first switch in a first time period of the specified period, and the first driving unit outputs the first driving voltage to the first switch in a second time period of the specified period, and the first time period is earlier than the second time period.

[0076] It may be clearly understood by those skilled in the art that for the convenience and brevity of descriptions, specific operation processes of the above-mentioned apparatus and modules may refer to corresponding processes in the foregoing method embodiments, which are not elaborated here.

[0077] In several embodiments provided in the application, coupling between modules may be electrical coupling, mechanical coupling or other forms of coupling.

[0078] Furthermore, each function module in each embodiment of the application may be integrated into a processing module, or each module may physically exist separately, or two or more modules may be integrated into a module. The above-mentioned integrated module may be implemented in form of hardware or in form of software function modules.

[0079] The application provides an apparatus for controlling an electromagnetic heating circuit, which controls whether N second resonant capacitors join in the resonant module by controlling switching states of N second switches. Since in case that more second resonant capacitors join in the resonance module, the equivalent capacitance of the resonant capacitors may be increased, that is, the LC resonant parameter of the electromagnetic heating circuit is expanded, thereby improving a heating power interval of the induction cooker equipped with the electromagnetic heating circuit.

[0080] With reference to FIG. 8, FIG. 8 schematically shows that an embodiment of the application further provides an electromagnetic heating circuit 800, the electromagnetic heating circuit 800 comprises one or more processors 810, a memory 820, and one or more applications. The one or more applications are stored in the memory 820 and are configured to be executed by the one or more processors 810, and the one or more applications are configured to perform the methods described in the above-mentioned embodiments.

[0081] The processor 810 may comprise one or more processing cores. The processor 810 is connected to various parts of the entire battery management system by using various interfaces and lines, and performs various functions of the battery management system and processes data by running or executing instructions, programs, code sets or instruction sets stored in the memory 820, and calling data stored in the memory 820. Optionally, the processor 810 may be implemented in a hardware form of at least one of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA) or Programmable Logic Array (PLA). A combination of one or more of a Central Processing Unit 810 (CPU), a Graphics Processing Unit 810 (GPU), a modem, or the like may be integrated into the processor 810. The CPU mainly processes an operating system, user interfaces, applications, or the like; the GPU is responsible for rendering and drawing to-be-displayed contents; and the modem is configured to process wireless communication. It may be understood that the above-mentioned modem may not be integrated into the processor 810, and may be separately implemented through a communication chip.

[0082] The memory 820 may comprise a Random Access Memory (RAM) 820, and may further comprise a Read-Only Memory (ROM) 820. The memory 820 may be configured to store instructions, programs, codes, code sets or instruction sets. The memory 820 may comprise a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (for example, a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the above-mentioned method embodiments, etc. The data storage area may also store data created by an electronic device during usage (for example, a phone book, audio and video data, chat history data, etc.).

[0083] In some embodiments, the electromagnetic heating circuit 800 may comprise a control module (not shown in the figure), and the control module comprises one or more processors 810 and a memory 820.

[0084] With reference to FIG. 9, FIG. 9 schematically shows that an embodiment of the application further provides a computer-readable storage medium 900, the computer-readable storage medium 900 has stored thereon computer program instructions 910. The computer program instructions 910 may be called by a processor to perform the methods described in the above-mentioned embodiments.

[0085] For example, the computer-readable storage medium 900 may be a flash memory, an Electrically Erasable Programmable Read-Only Memory (EEPROM), an Electrical Programmable Read-Only Memory (EPROM), a hard disk, or a ROM. Optionally, the computer-readable storage medium 900 comprises a non-transitory computer-readable storage medium. The computer-readable storage medium 900 has a storage space for computer program instructions 910 of performing any method operation in the above-mentioned methods. These computer program instructions 910 may be read from one or more computer program products, or may be written into one or more computer program products.

[0086] Finally, it should be noted that the above-mentioned embodiments are only intended to explain the technical solutions of the application, rather than limiting these technical solutions. Although the application has been described in detail with reference to the above-mentioned embodiments, it should by understood by those of ordinary skill in the art that they may still modify the technical solutions described in the above-mentioned embodiments, or make equivalent replacements to a part of technical features in these technical solutions. However, these modifications or replacements do not cause essence of corresponding technical solutions to deviate from the spirit and scope of the technical solution of the embodiments of the application.

Claims

1. An electromagnetic heating circuit, comprising: a power module; a resonance module, connected to the power module, and comprising a heating coil, a first resonant capacitor, N second resonant capacitors, a first switch and N second switches, wherein N is equal to or greater than 1; the heating coil, the first switch and the power module are sequentially connected in series, to form a current loop; the first resonant capacitor and the N second resonant capacitors are connected in parallel with the heating coil respectively, and each of the N second switches is connected in one-to-one correspondence to a branch where a respective one of the N second resonant capacitors is located; a driving module, connected to a control end of the first switch; and a control module, connected to the driving module and the N second switches, and configured to control heating power of the electromagnetic heating circuit by controlling switching states of the N second switches.

2. The electromagnetic heating circuit of claim 1, wherein N is equal to 1, the control module is specifically configured to: control the second switch to be closed, so that the heating power of the electromagnetic heating circuit belongs to a first interval; and control the second switch to be opened, so that the heating power of the electromagnetic heating circuit belongs to a second interval, wherein an upper limit of the second interval is less than a lower limit of the first interval.

3. The electromagnetic heating circuit of claim 1, wherein the driving module comprises a plurality of driving units, the plurality of driving units is provided with an end connected to the control module and an other end connected to the control end of the first switch, and driving voltages output by the plurality of driving units are different from each other, the control module is specifically configured to: control heating efficiency of the electromagnetic heating circuit by controlling the switching states of the second switches and an operation mode of the driving module, wherein the driving module outputs different driving voltages to the first switch in different operation modes.

4. The electromagnetic heating circuit of claim 3, wherein N is equal to 1, the plurality of driving units comprise a first driving unit and a second driving unit, and a first driving voltage output by the first driving unit is greater than a second driving voltage output by the second driving unit, the control module is specifically configured to: control the second switch to be closed, and control the driving module to be in a first operation mode, so that the heating power of the electromagnetic heating circuit belongs to a first power interval; control the second switch to be opened, and control the driving module to be in the first operation mode, so that the heating power of the electromagnetic heating circuit belongs to a second power interval; and control the second switch to be opened, and control the driving module to be in a second operation mode, so that the heating power of the electromagnetic heating circuit belongs to a third power interval, wherein a lower limit of the first power interval is greater than an upper limit of the second power interval, and a lower limit of the second power interval is greater than an upper limit of the third power interval; the first operation mode refers to an operation mode in which the first driving unit outputs the first driving voltage to the first switch in a specified period; the second operation mode refers to an operation mode in which the second driving unit outputs the second driving voltage to the first switch in a first time period of the specified period, and the first driving unit outputs the first driving voltage to the first switch in a second time period of the specified period, and the first time period is earlier than the second time period.

5. The electromagnetic heating circuit of claim 4, wherein the first driving voltage is a rated turn-on voltage of the first switch.

6. The electromagnetic heating circuit of any one of claims 1 to 5, wherein the power module comprises a first voltage output end and a second voltage output end, an end of the heating coil is connected to the first voltage output end, and an other end of the heating coil is connected to a first connection end of the first switch, a second connection end of the first switch is connected to the second voltage output end.

7. The electromagnetic heating circuit of claim 6, wherein the first switch is an Insulated Gate Bipolar Transistor (IGBT), the control end of the first switch is a gate of the IGBT, the first connection end of the first switch is a collector of the IGBT, and the second connection end of the first switch is an emitter of the IGBT.

8. The electromagnetic heating circuit of any one of claims 1 to 7, wherein the power module comprises a full-wave rectifier bridge and an LC filter circuit, and a signal input end of the full-wave rectifier bridge is configured to input alternating current, the LC filter circuit is connected between a signal output end of the full-wave rectifier bridge and the resonance module.

9. The electromagnetic heating circuit of any one of claims 1 to 8, wherein each of the first resonant capacitor and the second resonant capacitor is a voltage-resistant capacitor.

10. An appliance device, comprising: a housing; and an electromagnetic heating circuit of any one of claims 1 to 9.

11. The appliance device of claim 10, wherein the housing comprises a first housing and a second housing, the first housing and the second housing cover each other to form an accommodation space for arranging the electromagnetic heating circuit.

12. The appliance device of claim 11, wherein the appliance device further comprises a function panel arranged on an outer surface of the second housing and electrically connected to a control module of the electromagnetic heating circuit.

13. A method for controlling an electromagnetic heating circuit, applied to an electromagnetic heating circuit of any one of claims 1 to 9, the method comprising: acquiring a desired heating power of the electromagnetic heating circuit; determining target switching states of second switches based on the desired heating power; and controlling an actual heating power of the electromagnetic heating circuit based on the target switching states, so that the actual heating power approaches the desired heating power.

14. The method of claim 13, wherein controlling the actual heating power of the electromagnetic heating circuit based on the target switching states, so that the actual heating power approaches the desired heating power comprises: controlling the second switches to be closed, so that the heating power of the electromagnetic heating circuit belongs to a first interval; and controlling the second switches to be opened, so that the heating power of the electromagnetic heating circuit belongs to a second interval, wherein an upper limit of the second interval is less than a lower limit of the first interval.

15. The method of claim 13, further comprising: determining a target operation mode of a driving module based on the desired heating power, wherein controlling the actual heating power of the electromagnetic heating circuit based on the target switching states, so that the actual heating power approaches the desired heating power comprises: controlling the actual heating power of the electromagnetic heating circuit based on the target switching states and the target operation mode, so that the actual heating power approaches the desired heating power.

16. The method of claim 15, wherein controlling the actual heating power of the electromagnetic heating circuit based on the target switching states and the target operation mode, so that the actual heating power approaches the desired heating power comprises: controlling the second switches to be closed, and controlling the driving module to be in a first operation mode, so that the actual heating power of the electromagnetic heating circuit belongs to a first power interval; controlling the second switches to be opened, and controlling the driving module to be in the first operation mode, so that the actual heating power of the electromagnetic heating circuit belongs to a second power interval; and controlling the second switches to be opened, and controlling the driving module to be in a second operation mode, so that the actual heating power of the electromagnetic heating circuit belongs to a third power interval, wherein a lower limit of the first power interval is greater than an upper limit of the second power interval, and a lower limit of the second power interval is greater than an upper limit of the third power interval; the first operation mode refers to an operation mode in which a first driving unit outputs a first driving voltage to a first switch in a specified period; the second operation mode refers to an operation mode in which a second driving unit outputs a second driving voltage to the first switch in a first time period of the specified period, and the first driving unit outputs the first driving voltage to the first switch in a second time period of the specified period, and the first time period is earlier than the second time period.

17. The method of any one of claims 13 to 16, wherein the electromagnetic heating circuit is arranged in an appliance device, and the control module is electrically connected to a function panel of the appliance device, acquiring the desired heating power of the electromagnetic heating circuit comprises: acquiring a heating mode of the appliance device, wherein the heating mode is determined based on an electrical signal generated when the function panel is triggered; and acquiring the desired heating power of the electromagnetic heating circuit based on the heating mode and a preset operation mode mapping table, wherein the operation mode mapping table is configured to characterize a mapping relationship between different heating modes and different desired heating powers.

18. An apparatus for controlling an electromagnetic heating circuit, applied to an electromagnetic heating circuit of any one of claims 1 to 9, the apparatus comprising: an acquisition module, configured to acquire a desired heating power of the electromagnetic heating circuit; a determination module, configured to determine target switching states of second switches based on the desired heating power; and a control module, configured to control an actual heating power of the electromagnetic heating circuit based on the target switching states, so that the actual heating power approaches the desired heating power.

19. An electromagnetic heating circuit, comprising: one or more processors; a memory; and one or more applications, stored in the memory, configured to be executed by the one or more processors, and configured to perform a method of any one of claims 13 to 17.

20. A computer-readable storage medium, having stored thereon computer program instructions, wherein the computer program instructions are called by a processor to perform a method of any one of claims 13 to 17.

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