Resonant circuit, control method of resonant circuit, and electromagnetic range

Abstract

The application discloses a resonant circuit, a control method of the resonant circuit and an electromagnetic oven. The resonant circuit comprises a power supply module, a plurality of resonant heating modules, a plurality of driving power tubes, a control module, a plurality of driving modules and at least one switch. The driving module is used for receiving a control pulse signal output by the control module and controlling the conduction or cut-off of the driving power tube according to the control pulse signal; the switch is connected between two adjacent resonant heating modules, a first end of the switch is connected with an output end of the control module, and a second end and a third end of the switch are respectively connected with second ends of the two adjacent resonant heating modules; when the control module controls the switch to be conducted, the two adjacent resonant heating modules are connected in parallel. The resonant circuit can heat the adjacent resonant heating modules at the same frequency by changing the connection method of the resonant heating modules, so that the resonant circuit can work stably while eliminating the noise generated by the magnetic field interference between the adjacent resonant heating modules.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic cooker technology, and in particular to a resonant circuit, a control method for the resonant circuit, and an electromagnetic cooker. Background Technology

[0002] In related technologies, multi-coil induction cookers use a multi-coil combination heating method, that is, a single chip simultaneously drives and controls multiple resonant circuits to perform multi-coil combination heating, so as to be compatible with cookware of different sizes.

[0003] Currently, when multiple coils simultaneously heat one or more cookwares, and the coupling between different coils and the cookware varies significantly, a half-bridge topology control technique can be used to control the coils to heat at the same frequency, eliminating the noise problem caused by mutual interference of magnetic fields between adjacent coils. However, in a resonant circuit, the operating state of the power devices has a significant impact on the circuit's reliability. When the resonant circuit operates under poor conditions, the power devices may face higher voltage and current stresses, or operate in the nonlinear region. This leads to increased power device losses and higher temperatures, potentially causing reliability issues such as thermal failure and electrical breakdown.

[0004] For example, when using a single-tube topology for coil heating control at the same frequency, the driving power transistor (Insulated Gate Bipolar Transistor, IGBT) is prone to operating under poor conditions. For instance, the IGBT transistor operates poorly when it is turned on at a high voltage or when the reverse freewheeling current is large, which poses a reliability problem. Summary of the Invention

[0005] In view of this, the present invention aims to at least partially solve one of the problems in the related art. Therefore, the object of the present invention is to provide a resonant circuit, a control method for the resonant circuit, and an induction cooker.

[0006] This application provides a resonant circuit. The resonant circuit includes a power supply module, multiple resonant heating modules, multiple drive power transistors, a control module, multiple drive modules, and at least one switch. The power supply module provides power to the resonant circuit. The resonant heating module includes a coil inductor and a resonant capacitor. The first end of the resonant heating module is connected to the first output end of the power supply module. The collector of the driving power transistor is connected to the second end of the resonant heating module, and the emitter of the driving power transistor is connected to the second output end of the power supply module. The input end of the control module is connected to the third output end of the power supply module. The control module outputs a control pulse signal to control the driving power transistor to turn on or off. The input end of the driving module is connected to the output end of the control module, and the output end of the driving module is electrically connected to the gate of the driving power transistor. The driving module receives the control pulse signal output by the control module and controls the driving power transistor to turn on or off according to the control pulse signal. The switch is connected between two adjacent resonant heating modules. The first end of the switch is connected to the output end of the control module, and the second and third ends of the switch are respectively connected to the second ends of two adjacent resonant heating modules. When the control module controls the switch to turn on, the two adjacent resonant heating modules are connected in parallel.

[0007] In some embodiments, the resonant circuit further includes a current detection module. The first input terminal of the current detection module is connected to the resonant heating module, the second input terminal of the current detection module is connected to the collector of the driving power transistor, and the output terminal of the current detection module is connected to the control module. The current detection module is used to detect whether the resonant current generated by the resonant heating module changes, so as to detect whether a pot is placed on the resonant heating module and output an electrical signal to the control module. The control module controls the corresponding resonant heating module to start heating according to the electrical signal.

[0008] In some embodiments, the resonant circuit further includes a current detection module. The first input terminal of the current detection module is connected to the coil inductance of the resonant heating module, and the second input terminal of the current detection module is connected to the resonant capacitor of the resonant heating module and the collector of the driving power transistor. The output terminal of the current detection module is connected to the control module. The current detection module is used to detect whether the resonant current of the resonant heating module changes, so as to detect whether a pot is placed on the resonant heating module and output an electrical signal to the control module. The control module controls the corresponding resonant heating module to start heating according to the electrical signal.

[0009] In some embodiments, at least one current detection module is provided on the circuit between two adjacent resonant heating modules and the collector of the driving power transistor.

[0010] In some implementations, the electrical signal includes cookware detection information and current change values.

[0011] In some embodiments, the current detection module is used to determine that the position of the pot on the resonant heating module connected to the current detection module has changed if the resonant current of the resonant heating module changes according to the electrical signal and the change value reaches a preset current value. The module then outputs a stop heating electrical signal to the control module. The control module controls the resonant heating module to stop heating according to the electrical signal, disconnects all switches, and controls the current detection module to re-detect whether the pot is placed on the resonant heating module and sends a regenerated electrical signal to the control module. The control module then controls the corresponding resonant heating module to start heating according to the regenerated electrical signal.

[0012] In some embodiments, the control module is configured to receive the electrical signal and control the resonant heating module to stop heating when the electrical signal indicates that the resonant current value is 0; or, control the resonant heating module to stop heating when the electrical signal indicates that the resonant current value is lower than a predetermined current value.

[0013] This application also provides a control method for a resonant circuit, applied to the resonant circuit described in any of the above embodiments. The control method includes: receiving a first heating command to simultaneously heat a pot using multiple resonant heating modules; and controlling, according to the first heating command, simultaneously closing the switches between the multiple resonant heating modules and turning on the corresponding drive power transistors, so that the multiple resonant heating modules heat at the same frequency.

[0014] In some embodiments, the control method further includes: receiving a second heating command to simultaneously control multiple sets of resonant heating modules to heat multiple cookware by causing a group of resonant heating modules to heat the same cookware; controlling the simultaneous closure of switches corresponding to multiple sets of resonant heating modules, the connection between multiple sets of resonant heating modules, and the conduction of corresponding drive power transistors according to the heating command, so that the multiple sets of resonant heating modules corresponding to multiple cookwares heat at the same frequency; or controlling the simultaneous closure of switches corresponding to multiple sets of resonant heating modules and the conduction of corresponding drive power transistors according to the second heating command, and controlling the simultaneous or time-sharing disconnection of switches connecting multiple sets of resonant heating modules, so that the multiple sets of resonant heating modules corresponding to multiple cookwares heat at the same frequency or alternately; wherein, a group of resonant heating modules includes at least two resonant heating modules.

[0015] This application also provides an electromagnetic cooker. The electromagnetic cooker includes the resonant circuit described in the above embodiments.

[0016] Thus, the resonant circuit of this application can be modified by changing the connection method of the resonant heating modules, so that the resonant heating modules for heating the same or multiple pots can be connected in parallel. This allows adjacent resonant heating modules to heat at the same frequency, eliminating noise caused by magnetic field interference between adjacent resonant heating modules while ensuring stable operation of the resonant circuit without reliability issues.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of a scenario in which a resonant circuit is applied in an induction cooker according to certain embodiments of this application;

[0020] Figure 2 This is one of the structural schematic diagrams of the resonant circuit in certain embodiments of this application;

[0021] Figure 3 This is a second schematic diagram of the resonant circuit in some embodiments of this application;

[0022] Figure 4 This is the third schematic diagram of the resonant circuit in some embodiments of this application.

[0023] Main component reference numerals:

[0024] Resonant circuit 100;

[0025] Power module 110, first output terminal 1101, second output terminal 1102, third output terminal 1103, AC power supply 10, first filter module 20, rectifier module 30, second filter module 40, and current detection module 50; resonant heating module 120, first terminal 1201, second terminal 1202, first resonant heating module 121, second terminal 1212, second resonant heating module 122, second terminal 1222, third resonant heating module 123, fourth resonant heating module 50, AC power supply 10, first filter module 20, rectifier module 30, second filter module 40, and current detection module 50; Vibration heating module 124; drive power transistors 130, 131, 132, 133, and 134; control module 140, input terminal 1401, and output terminal 1402; drive module 150, 151, 152, 153, and 154; switch 160, 161, 162, and 163; current detection module 170, 171, and 172. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly, referring to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or connections that allow communication between components; direct connections or indirect connections via an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0029] The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] Please see Figure 1 and Figure 2 This application discloses a resonant circuit 100. The resonant circuit 100 includes a power supply module 110, a plurality of resonant heating modules 120, a plurality of drive power transistors 130, a control module 140, a plurality of drive modules 150, and at least one switch 160.

[0032] The power supply module 110 provides electrical energy to the resonant circuit 100. Specifically, the power supply module 110 may include an AC power supply 10, a first filter module 20, a rectifier module 30, a second filter module 40, and a current detection module 50. The AC power supply 10 is connected to the input terminal of the first filter module 20, the output terminal of the first filter module 20 is connected to the input terminal 301 of the rectifier module 30, and the output terminal of the rectifier module 30 is connected to the input terminal of the second filter module 40.

[0033] The resonant heating module 120 includes a coil inductance L and a resonant capacitor C. The coil inductance L and the resonant capacitor C generate a resonant current. The first terminal 1201 of the resonant heating module 120 is connected to the first output terminal 1101 of the power supply module 110. The coil inductance L and the resonant capacitor C can be connected in parallel or in series; this is not a limitation.

[0034] The number of resonant heating modules 120 can be, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, and is not limited here. Figure 2 As shown, there can be four resonant heating modules 120, namely a first resonant heating module 121, a second resonant heating module 122, a third resonant heating module 123, and a fourth resonant heating module 124. Correspondingly, since each resonant heating module 120 includes a coil inductance L and a resonant capacitor C, therefore... Figure 2The first resonant heating module 121 includes a coil inductor L1 and a resonant capacitor C1; the second resonant heating module 122 includes a coil inductor L2 and a resonant capacitor C2; the third resonant heating module 123 includes a coil inductor L3 and a resonant capacitor C3; and the fourth resonant heating module 124 includes a coil inductor L4 and a resonant capacitor C4.

[0035] The collector (C) of the driving power transistor 130 is connected to the second terminal 1202 of the resonant heating module 120, and the emitter (E) of the driving power transistor 130 is connected to the second output terminal 1102 of the power supply module 110.

[0036] The number of multiple drive power transistors 130 can be, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, and there is no limitation here. Figure 2 As shown, there can be four drive power transistors 130, namely the first drive power transistor 131, the second drive power transistor 132, the third drive power transistor 133 and the fourth drive power transistor 134.

[0037] The input terminal 1401 of the control module 140 is connected to the third output terminal 1103 of the power module 110. The control module 140 is used to output a control pulse signal to control the power transistor 130 to turn on or off. The control pulse signal is, for example,... Figure 2 The PPG1, PPG2, PPG3 and PPG4 signals in the data.

[0038] The input terminal of the drive module 150 is connected to the output terminal 1402 of the control module 140, and the output terminal of the drive module 150 is electrically connected to the gate (G) of the drive power transistor 130. The drive module 150 is used to receive the control pulse signal output by the control module 140 and control the drive power transistor 130 to be turned on or off according to the control pulse signal.

[0039] In other words, this application can control the drive module 150 to work by sending control pulse signals from the control module 140, thereby controlling the drive power transistor 130 to conduct, so that the resonant heating module 120 connected to the drive power transistor 130 can be heated accordingly.

[0040] The number of multiple driver modules 150 can be, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, and there is no limit here. Figure 2 As shown, there can be four drive modules 150, namely the first drive module 151, the second drive module 152, the third drive module 153 and the fourth drive module 154.

[0041] Switch 160 is connected between two adjacent resonant heating modules 120. The first terminal of switch 160 is connected to the output terminal 1402 of control module 140, and the second and third terminals of switch 160 are respectively connected to the second terminals 1202 of the two adjacent resonant heating modules 120. When control module 140 controls switch 160 to be turned on, the two adjacent resonant heating modules 120 are connected in parallel. Figure 2 As shown, the second and third terminals of switch 160 are respectively connected to the second terminals 1202 of two adjacent resonant heating modules 120. The control module 140 can send control signals to control switch 160 to close or open. The control signals are SV1, SV2 and SV3 signals respectively.

[0042] The resonant circuit 100 includes at least one switch 160, meaning that the resonant circuit 100 can have one or more switches 160. The number of switches 160 can be 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, without limitation. For example... Figure 2 As shown, there can be three switches 160, namely the first switch 161, the second switch 162 and the third switch 163.

[0043] Therefore, as Figure 2 As shown, the first end of the first switch 161 is connected to the output end 142 of the control module 140, and the second and third ends of the first switch 161 are respectively connected to the second end 1212 of the adjacent first resonant heating module 121 and the second end 1222 of the second resonant heating module 122.

[0044] It should be noted that, since the switch 160 in this application is connected between two adjacent resonant heating modules 120, the number of switches 160 provided in the resonant circuit 100 is one less than the number of resonant heating modules 120. For example, as Figure 2 As shown, a first switch 161 is provided between the first resonant heating module 121 and the second resonant heating module 122, a second switch 162 is provided between the second resonant heating module 122 and the third resonant heating module 123, and a third switch 163 is provided between the third resonant heating module 123 and the fourth resonant heating module 124. That is, there are 4 resonant heating modules 120 and 3 switches 160 at this time.

[0045] A switch 160 is provided between adjacent resonant heating modules 120 in this application, so that the connection between adjacent resonant heating modules 120 can be controlled by the switch 160 to connect two adjacent resonant heating modules 120 in parallel, thereby controlling the two adjacent resonant heating modules 120 to heat at the same frequency, eliminating magnetic field interference between adjacent resonant heating modules 120, and thus eliminating noise.

[0046] In detail, when the drive power transistor 130 receives the control pulse signal from the control module 110 to start the power-on, the first switch 161, the second switch 162 and the third switch 163 in the resonant circuit 100 are disconnected. At this time, each resonant heating module 120 can independently start the cookware detection and send the cookware data detected by each resonant heating module 120 to the control module 140. The cookware data includes the size, model, position and function information of the corresponding cookware that can be heated.

[0047] Understandably, the multi-resonant heating module induction cooker system composed of resonant circuit 100 can first confirm whether a pot is placed on each resonant heating module 120. This is usually achieved by detecting the response of the pot to the electromagnetic field generated by the resonant heating module 120. In addition, the size and shape of the pot also affect the distribution of the electromagnetic field and the heating effect. Therefore, the multi-resonant heating module induction cooker system can estimate the size of the pot by the distribution of the induced current.

[0048] Furthermore, in a multi-resonance heating module induction cooker system, the precise position of the cookware on a specific resonant heating module 120 can be determined by observing the cookware's response to the electromagnetic field generated by the resonant heating module 120. This helps the control module 140 to more accurately control the heating area of ​​the multi-resonance heating module induction cooker system, avoiding energy waste and safety hazards.

[0049] In a multi-resonant heating module induction cooker system, users can select one or more resonant heating modules for heating. Each resonant heating module 120 represents an independent heating zone. Users can select the heating zone according to their cooking needs (such as heating multiple pots simultaneously or heating only one pot). This flexibility allows the multi-resonant cooker system to adapt to various cooking scenarios, improving cooking efficiency and convenience. Cooking function modes can refer to cooking modes or heating modes, such as stir-frying, soup making, steaming, and heat preservation modes. Each function mode requires different heating power, time, and temperature control strategies from the resonant heating module 120.

[0050] The control module 140 can display the model, position, and function information of the cookware placed on the corresponding resonant heating module 120 that can be heated at this time. The user can select the cooking function mode and the position area of ​​the cookware that can be heated according to their needs, so that the control module 140 sends a pulse control signal to the corresponding drive power transistor 130. The drive power transistor 130 starts the corresponding resonant heating module 120 to heat according to the received pulse control signal.

[0051] Thus, the resonant circuit 100 of this application can be modified by changing the connection method of the resonant heating module 120, so that the resonant heating modules 120 heating the same pot or multiple pots can be connected in parallel. This allows adjacent resonant heating modules 120 to heat at the same frequency. While eliminating the noise generated by magnetic field interference between adjacent resonant heating modules 120, the resonant circuit 100 can work stably without any reliability issues.

[0052] Please see Figure 3 In one embodiment, the resonant circuit 100 further includes a current detection module 170. The first input terminal of the current detection module 170 is connected to the resonant heating module 120, the second input terminal is connected to the collector (C) of the driving power transistor 130, and the output terminal is connected to the control module 140. The current detection module 170 is used to detect whether the resonant current generated by the resonant heating module 120 changes, thereby detecting whether a pot is placed on the resonant heating module 120 and outputting an electrical signal to the control module 140. The control module 140, based on the electrical signal, controls the corresponding resonant heating module 120 to start heating. For example, the electrical signal could be... Figure 3 The ADCUR1 and ADCUR2 signals are shown.

[0053] Specifically, since the first input terminal of the current detection module 170 is connected to the resonant heating module 120, the second input terminal of the current detection module 170 is connected to the collector (C) of the driving power transistor 130, and the output terminal of the current detection module 170 is connected to the control module 140, when the current detection module 170 detects a change in the resonant current generated by a certain resonant heating module 120, it can determine that the pot on the resonant heating module 120 has moved and has a positional change, and can then generate an electrical signal to be sent to the control module. Since the output terminal of the current detection module 170 is connected to the control module 140, the control module 140 can receive the electrical signal corresponding to the detection result of the current detection module 170 in real time.

[0054] The resonant circuit 100 may include at least one current detection module 170. For example, such as Figure 3 As shown, the resonant circuit 100 includes two current detection modules 170, namely a first current detection module 171 and a second current detection module 172. The first current detection module 171 is correspondingly disposed in the circuit between the second resonant heating module 122 and the second driving power transistor 132, and the second current detection module 172 is correspondingly disposed in the circuit between the fourth resonant heating module 124 and the fourth driving power transistor 134.

[0055] For example, if the first switch 161 is in the closed state, the first resonant heating module 121 and the second resonant heating module 122 are connected in parallel. When the first current detection module 171 detects that the resonant current generated by the first resonant heating module 121 and the second resonant heating module 122 changes from 0 to a certain current value, it can be determined that the state of the first resonant heating module 121 and the second resonant heating module 122 without any pot is changed to the state with a pot currently placed on it.

[0056] If the first switch 161 is in the closed state, the first resonant heating module 121 and the second resonant heating module 122 are connected in parallel. When the first current detection module 171 detects that the resonant current generated by the first resonant heating module 121 and the second resonant heating module 122 changes from a certain current value to 0, it can be determined that the state of the first resonant heating module 121 and the second resonant heating module 122 has changed from the state of having a pot placed on it to the state of not having a pot placed on it. It can be determined that the position of the pot placed on the first resonant heating module 121 and the second resonant heating module 122 has changed.

[0057] If the first switch 161 is in the open state, when the first current detection module 171 detects that the resonant current generated by the second resonant heating module 122 changes from 0 to a certain current value, it can be determined that the state of the second resonant heating module 122 where no pot was placed has changed to the state where a pot is currently placed.

[0058] If the first switch 161 is in the open state, when the first current detection module 171 detects that the resonant current generated by the second resonant heating module 122 changes from a certain current value to 0, it can be determined that the state of the second resonant heating module 122 changing from the state of having a pot placed on it to the state of not having a pot placed on it. It can be determined that the position of the pot placed on the second resonant heating module 122 has changed at this time.

[0059] Therefore, this application can further include a current detection module 170 between the resonant heating module 120 and the switch 160 to detect whether the resonant current generated by the resonant heating module 120 changes, thereby detecting whether a pot is placed on the resonant heating module 120. Alternatively, it can determine that the position of the pot placed on the resonant heating module 120 has changed and output an electrical signal to the control module 140. The control module 140 controls the corresponding resonant heating module 120 to start heating based on the electrical signal.

[0060] Furthermore, the position of the current detection module 170 in this application can be changed; it can be set not only in places such as... Figure 3 The position shown can also be set at... Figure 4The position shown is on the circuit between the coil inductance L and the resonant capacitor C of the resonant heating module 120.

[0061] Specifically, please refer to Figure 4 In another embodiment, the first input terminal of the current detection module 170 is connected to the coil inductance L of the resonant heating module 120, and the second input terminal of the current detection module 170 is connected to both the resonant capacitor C of the resonant heating module 120 and the collector C of the driving power transistor 130. The output terminal of the current detection module 170 is connected to the control module 140. The current detection module 170 is used to detect whether the resonant current of the resonant heating module 120 changes, thereby detecting whether a pot is placed on the resonant heating module 120 and sending an electrical signal to the control module 140. Based on the electrical signal, the control module 140 controls the corresponding resonant heating module 120 to start heating.

[0062] That is, the current detection module 170 of this application can not only be set on the circuit outside the entire resonant heating module 120, but also on the circuit inside the resonant heating module 120 connected to the coil inductance L. The setting position of the current detection module 170 is quite flexible.

[0063] In some embodiments, at least one current detection module 170 is provided on the circuit between two adjacent resonant heating modules 120 and the collector C of the drive power transistor 130.

[0064] In other words, the number of current detection modules 170 in this application can be the same as the number of resonant heating modules 120, with a one-to-one correspondence between the number of current detection modules 170 and the number of resonant heating modules 120. Alternatively, this application can provide one current detection module 170 between every two adjacent resonant heating modules 120, i.e., one current detection module 170 corresponding to every two resonant heating modules 120. For example, as... Figure 3 or Figure 4 As shown, the resonant circuit 100 is provided with 4 resonant heating modules 120, and each pair of resonant heating modules 120 is provided with 1 current detection module 170, that is, there can be 2 current detection modules 170.

[0065] The electrical signals include cookware detection information and current change values. The cookware detection information may include the position, size, and model information of the cookware placed above the resonant heating module 120, etc., and is not limited here.

[0066] The current change value refers to the absolute value of the difference between the current changes before and after the position or model of the cookware above the resonant heating module 120 changes. For example, when the cookware is on the resonant heating module 120, the initial current value detected by the current detection module 170 is 'a'. After the cookware is moved from the resonant heating module 120, the initial current value detected by the current detection module 170 is 'b'. The current change value is the absolute value of the difference between 'b' and 'a', which is |ba|.

[0067] In one embodiment, the current detection module 170 is used to determine that the position of the pot on the resonant heating module 120 connected to the current detection module 170 has changed if a change in the resonant current of the resonant heating module 120 is detected based on an electrical signal and the change in current reaches a preset current value. The module then outputs a stop heating electrical signal to the control module 140. The control module 140 controls the resonant heating module 120 to stop heating based on the electrical signal, disconnects all switches 160, and controls the current detection module to re-detect whether a pot is placed on the resonant heating module and sends a regenerated electrical signal to the control module 140. The control module 140 then controls the corresponding resonant heating module 120 to start heating based on the regenerated electrical signal. The electrical signal at this time can be a current signal.

[0068] Understandably, when a pot is placed on the resonant heating module 120, the resonant current generated by the resonant heating module 120 will vary within a small range. Therefore, the allowable variation value of the resonant current is within a preset range and does not have to be a rated current value. Thus, when the variation value of the resonant current reaches the preset current value, it can be used to determine the change in the pot on the resonant heating module 120. The preset current value can be a pre-set value and is not limited here.

[0069] In other words, when the current detection module 170 of this application determines that the position of the pot on the corresponding resonant heating module 120 has changed, it can control all switches 160 to be automatically turned off and all drive power transistors 130 to be in the cut-off state, so that all resonant heating modules 120 stop heating. This avoids the problem that the resonant heating module 120 continues to heat after the pot leaves the resonant heating module 120. This reduces energy loss and allows for flexible control of the corresponding resonant heating module 120 to restart heating after the resonant heating module 120 where the pot is located is detected again, thereby maximizing the energy consumption of the resonant circuit 100.

[0070] In some embodiments, the control module 140 is used to receive an electrical signal and control the resonant heating module 120 to stop heating when the electrical signal indicates that the resonant current value is 0; or, control the resonant heating module 120 to stop heating when the electrical signal indicates that the resonant current value is lower than a predetermined current value.

[0071] In other words, when the current detection module 170 detects that the resonant current generated by the corresponding resonant heating module 120 is too low or 0, it can send a control pulse signal to the drive module 150 in real time, so that the drive module 150 drives the corresponding drive power tube 130 to be in the cut-off state, thereby timely controlling the resonant heating module 120 without pots to stop heating.

[0072] It should be noted that if each of the resonant heating modules 120 is equipped with a current detection module 170, the minimum current value of the resonant heating module 120 that reaches the preset current value can be determined based on the current signal emitted by the current detection module 170. This allows the switch 160 connected to the resonant heating module 120 to be disconnected and the driving power transistor 130 to be stopped. The timing of disconnecting the switch 160 and stopping the driving power transistor 130 can be set at the zero-crossing point of the mains power of the control pulse signal.

[0073] If at least one of the multiple sets of resonant heating modules 120 does not have a current detection module 170, the total current signal detected by the current detection module 50 connected to the control module 140 and the first current signal generated by the current detection module 170 after detecting a certain set of resonant heating modules 120 are used to determine the second current signal generated by the resonant heating module 120 without the current detection module 170. Based on the first current signal and the second current signal, the resonant heating module 120 that needs to be controlled to stop heating is determined.

[0074] For example, if the first current signal indicates that the first current is 0 or lower than a predetermined current value, the first set of resonant heating modules 120 connected to the current detection module 170 is controlled to stop heating. If the second current signal indicates that the second current is 0 or lower than a predetermined current value, the second set of resonant heating modules 120 is controlled to stop heating.

[0075] This application also provides a control method for a resonant circuit. This method is applied to the resonant circuit 100 described in any of the above embodiments. The control method includes:

[0076] 01: Receive a first heating command to simultaneously heat a pot using multiple resonant heating modules 120, and control the simultaneous closure of switches 160 between multiple resonant heating modules 120 and the conduction of corresponding drive power transistors 130 according to the first heating command, so that the multiple resonant heating modules 120 heat at the same frequency.

[0077] Please refer to the following: Figures 1 to 4Step 01 can be implemented by the control device 140 of the resonant circuit 100. The control device 140 of the resonant circuit 100 is used to receive a first heating command to simultaneously heat a pot by multiple resonant heating modules 120, and according to the first heating command, control the simultaneous closure of the switch 160 between multiple resonant heating modules 120 and the conduction of the corresponding drive power tube 130 so that the multiple resonant heating modules 120 heat at the same frequency.

[0078] Specifically, when the drive power transistor 130 receives a power-on command from the power module 110, the switch 160 opens. The current detection module 170 of each resonant heating module 120 can independently activate cookware detection and send the cookware data detected by each resonant heating module 120 to the control device 140. The control device 140 can display the cookware data for the user. The user can select the function and the area to be heated according to their needs, thereby issuing a first heating command to the control device 140 to simultaneously heat one cookware using multiple resonant heating modules 120. This causes the switches 160 controlling the multiple resonant heating modules 120 to close simultaneously, ensuring that all resonant heating modules 120 heat at the same frequency.

[0079] At this time, the control device 140 will simultaneously send a control pulse signal to the drive module 150, so that the drive module 150 controls all the drive power transistors 130 to be turned on, thereby enabling the control device 140 to start the heating of multiple resonant heating modules 120 at the same frequency according to the received heating command.

[0080] Thus, the control method of the resonant circuit in this application can connect multiple resonant heating modules 120 that heat the same pot in parallel according to the first heating command issued by the user to the control module 140. This allows multiple resonant heating modules 120 to heat at the same frequency. While eliminating the noise caused by magnetic field interference between adjacent resonant heating modules 120, the resonant circuit 100 can work stably without any reliability issues.

[0081] In one implementation, the control method further includes:

[0082] 02: Receive a second heating command to simultaneously control multiple sets of resonant heating modules to heat multiple cookware by heating the same cookware with a set of resonant heating modules. According to the heating command, control the simultaneous closure of the switches 160 corresponding to the multiple sets of resonant heating modules 120, the connection of the switches 160 between the multiple sets of resonant heating modules 120, and the conduction of the corresponding drive power transistors 130, so that the multiple sets of resonant heating modules corresponding to the multiple cookwares heat at the same frequency; wherein, a set of resonant heating modules includes at least two resonant heating modules 120.

[0083] Please refer to the following: Figures 1 to 4Step 02 can be implemented by the control device 140 of the resonant circuit 100. The control device 140 of the resonant circuit 100 is used to receive a second heating command to simultaneously control multiple sets of resonant heating modules to heat multiple cookware by heating the same cookware with a set of resonant heating modules. According to the heating command, the control device 140 controls the simultaneous closing of the switches 160 corresponding to the multiple sets of resonant heating modules 120, the connection of the switches 160 between the multiple sets of resonant heating modules 120, and the conduction of the corresponding drive power transistors 130, so that the multiple sets of resonant heating modules corresponding to the multiple cookwares heat at the same frequency; wherein, a set of resonant heating modules includes at least two resonant heating modules 120.

[0084] Specifically, when a heating instruction is received that causes a group of resonant heating modules to heat the same pot, thereby simultaneously controlling multiple groups of resonant heating modules to heat multiple different pots, the control module 140 can control the switches 160 corresponding to the multiple groups of resonant heating modules and the switches 160 connecting the multiple groups of resonant heating modules to close according to the heating instruction, so that the multiple groups of resonant heating modules are connected in parallel to heat multiple pots simultaneously.

[0085] At the same time, the control module 140 can simultaneously turn on the drive power transistors 130 corresponding to multiple sets of resonant heating modules to work at the same frequency and phase according to the heating command, so that the multiple sets of resonant heating modules corresponding to different cookwares are heated at the same frequency.

[0086] For example, multiple cookware sets include cookware 1 and cookware 2, such as Figure 1 and Figure 2 As shown, pot 1 is placed in the first set of resonant heating modules consisting of the first resonant heating module 121 and the second resonant heating module 122, and pot 2 is placed in the second set of resonant heating modules consisting of the third resonant heating module 123 and the fourth resonant heating module 124. At this time, the user can issue a second heating command to simultaneously control the first and second resonant heating modules to heat pot 1 and pot 2 at the same frequency. This requires controlling the first switch 161, the second switch 162, and the third switch 163 to close simultaneously, and simultaneously turning on the first drive power transistor 151, the second drive power transistor 152, the third drive power transistor 153, and the fourth drive power transistor 154.

[0087] Thus, the control method of this application can realize the artificial control of the heating of multiple sets of resonant heating modules at the same frequency when heating different cookware according to the second heating command issued by the user to the control module 140, thereby eliminating the influence of mutual interference of magnetic fields between adjacent resonant heating modules.

[0088] Alternatively, in another embodiment, the control method includes:

[0089] 03: Receive a heating command to simultaneously control multiple sets of resonant heating modules to heat multiple different cookware by heating the same cookware with a set of resonant heating modules. According to the second heating command, control the simultaneous closing of the switches 160 corresponding to the multiple sets of resonant heating modules and the turning on of the corresponding drive power transistors 130, and control the simultaneous or time-sharing disconnection of the switches 160 connecting the multiple sets of resonant heating modules, so that the multiple sets of resonant heating modules corresponding to the multiple cookwares heat at the same frequency or alternately; wherein, a set of resonant heating modules includes at least two resonant heating modules 120.

[0090] Please refer to the following: Figures 1 to 4 Step 02 can be implemented by the control device 140 of the resonant circuit 100. The control device 140 of the resonant circuit 100 is used to receive a heating command to simultaneously control multiple sets of resonant heating modules to heat multiple different cookware by heating the same cookware with a set of resonant heating modules. According to the second heating command, it controls the simultaneous closing of the switches 160 corresponding to the multiple sets of resonant heating modules and the turning on of the corresponding drive power transistors 130, and controls the simultaneous or time-sharing disconnection of the switches 160 connecting the multiple sets of resonant heating modules, so that the multiple sets of resonant heating modules corresponding to multiple cookwares heat at the same frequency or alternately; wherein, a set of resonant heating modules includes at least two resonant heating modules 120.

[0091] Specifically, when the second heating command is received, which is to cause a group of resonant heating modules to heat the same pot simultaneously, the control module 140 can close the switches 160 corresponding to the multiple groups of resonant heating modules 120 according to the heating command, so that each group of resonant heating modules 120 heats the same pot, and controls the switches 160 connecting the multiple groups of resonant heating modules to be disconnected simultaneously or separately. That is, the switches 160 between adjacent resonant heating modules heating different pots are disconnected simultaneously or at different times. So that when multiple groups of resonant heating modules heat multiple pots, the multiple resonant heating modules 120 connected in parallel can achieve the same frequency heating of the same pot by multiple resonant heating modules 120. At the same time, the multiple groups of resonant heating modules corresponding to the multiple pots can be heated at the same frequency or alternately by controlling the switches 160 to be disconnected simultaneously or at different times.

[0092] At the same time, the control module 140 can, according to the second heating command, simultaneously turn on the drive power transistors 130 connected to the multiple resonant heating modules 120 corresponding to each group of resonant heating modules to work at the same frequency and phase, so as to realize that multiple resonant heating modules 120 heat the same pot at the same frequency.

[0093] For example, multiple cookwares include cookware 1, cookware 2 and cookware 3. Cookware 1 is placed in the first set of resonant heating modules, cookware 2 is placed in the second set of resonant heating modules, and cookware 3 is placed in the third set of resonant heating modules.

[0094] If a user can issue a second heating command to control the first, second, and third resonant heating modules to heat cookers 1, 2, and 3 at the same frequency, then it is necessary to control the switches between multiple resonant heating modules within the first, second, and third resonant heating modules to close simultaneously, and simultaneously disconnect the switches between the first and second resonant heating modules and between the second and third resonant heating modules, and simultaneously turn on the drive power transistors connected to the first, second, and third resonant heating modules.

[0095] If a user can issue a second heating command to control the first, second, and third resonant heating modules to alternately heat cookware 1, cookware 2, and cookware 3, then it is necessary to control the switches between multiple resonant heating modules within the first, second, and third resonant heating modules to close simultaneously, and to time-divisionally disconnect the switches between the first and second resonant heating modules and between the second and third resonant heating modules, while simultaneously turning on the drive power transistors connected to the first, second, and third resonant heating modules.

[0096] The same-frequency heating in this application refers to the resonant heating module 120 in the induction cooker sending alternating current to all the cookware placed on the cooktop at the same frequency, thereby generating an alternating magnetic field, which in turn generates eddy currents at the bottom of the cookware for heating, thus eliminating mutual interference of magnetic fields between adjacent resonant heating modules.

[0097] Alternating heating refers to the method in which the resonant heating module 120 in the induction cooker alternately sends alternating current to the cookware at preset time intervals for heating.

[0098] Thus, the control method of this application enables the multiple resonant heating modules 120 in the resonant circuit 120 of this application to heat different cookware by heating at the same frequency, or to heat different cookware by heating alternately, making the heating mode of the multiple resonant heating modules 120 more diversified.

[0099] This application also provides an induction cooker. The induction cooker includes the resonant circuit 100 described in the above embodiments.

[0100] Thus, the resonant circuit 100 in the induction cooker of this application can be connected in parallel by changing the connection method of the resonant heating module 120, which heats the same pot or multiple pots. This allows adjacent resonant heating modules 120 to heat at the same frequency. While eliminating the noise caused by magnetic field interference between adjacent resonant heating modules 120, the resonant circuit 100 can work stably without any reliability issues.

[0101] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A resonant circuit, characterized in that, The resonant circuit includes: A power module, wherein the power module is used to provide electrical energy to the resonant circuit; Multiple resonant heating modules, each resonant heating module including a coil inductor and a resonant capacitor, with the first end of the resonant heating module connected to the first output end of the power module; Multiple driving power transistors, the collector of which is connected to the second terminal of the resonant heating module, and the emitter of which is connected to the second output terminal of the power module; A control module, the input terminal of which is connected to the third output terminal of the power module, is used to output a control pulse signal to control the power drive transistor to turn on or off. Multiple driving modules are provided, with their input terminals connected to the output terminals of the control module and their output terminals electrically connected to the gates of the driving power transistors. Each driving module receives control pulse signals output by the control module and controls the turning on or off of the driving power transistors according to the control pulse signals. At least one switch is connected between two adjacent resonant heating modules. The first end of the switch is connected to the output end of the control module, and the second and third ends of the switch are respectively connected to the second ends of the two adjacent resonant heating modules. When the control module controls the switch to be turned on, the two adjacent resonant heating modules are connected in parallel.

2. The resonant circuit according to claim 1, characterized in that, The resonant circuit further includes a current detection module. The first input terminal of the current detection module is connected to the resonant heating module, the second input terminal of the current detection module is connected to the collector of the driving power transistor, and the output terminal of the current detection module is connected to the control module. The current detection module is used to detect whether the resonant current generated by the resonant heating module changes, so as to detect whether a pot is placed on the resonant heating module and output an electrical signal to the control module. The control module controls the corresponding resonant heating module to start heating based on the electrical signal.

3. The resonant circuit according to claim 1, characterized in that, The resonant circuit also includes a current detection module. The first input terminal of the current detection module is connected to the coil inductance of the resonant heating module, and the second input terminal of the current detection module is connected to the resonant capacitor of the resonant heating module and the collector of the driving power transistor. The output terminal of the current detection module is connected to the control module. The current detection module is used to detect whether the resonant current of the resonant heating module changes, so as to detect whether a pot is placed on the resonant heating module and output an electrical signal to the control module. The control module controls the corresponding resonant heating module to start heating based on the electrical signal.

4. The resonant circuit according to claim 2 or 3, characterized in that, At least one current detection module is provided on the circuit between the collector of the two adjacent resonant heating modules and the drive power transistor.

5. The resonant circuit according to claim 2 or 3, characterized in that, The electrical signal includes the cookware detection information and the current change value.

6. The resonant circuit according to claim 2 or 3, characterized in that, The current detection module is used to determine that the position of the pot on the resonant heating module connected to the current detection module has changed if the resonant current of the resonant heating module changes according to the electrical signal and the change value of the current reaches a preset current value, and outputs an electrical signal to stop heating to the control module. The control module controls the resonant heating module to stop heating according to the electrical signal, disconnects all the switches, and controls the current detection module to re-detect whether the pot is placed on the resonant heating module and send a regenerated electrical signal to the control module. The control module then controls the corresponding resonant heating module to start heating based on the regenerated electrical signal.

7. The resonant circuit according to claim 2 or 3, characterized in that, The control module is used to receive the electrical signal and control the resonant heating module to stop heating when the electrical signal indicates that the resonant current value is 0; or, control the resonant heating module to stop heating when the electrical signal indicates that the resonant current value is lower than a predetermined current value.

8. A control method for a resonant circuit, applied to the resonant circuit according to any one of claims 1 to 7, characterized in that, The control method includes: The system receives a first heating command that causes multiple resonant heating modules to heat a pot simultaneously. Based on the first heating command, it controls the simultaneous closure of the switches between the multiple resonant heating modules and the activation of the corresponding drive power transistors, so that the multiple resonant heating modules heat at the same frequency.

9. The control method according to claim 8, characterized in that, The control method further includes: The system receives a second heating command to simultaneously control multiple sets of resonant heating modules to heat multiple cookware, thereby enabling a group of resonant heating modules to heat the same cookware. Based on the heating command, the system controls the simultaneous closing of switches corresponding to multiple sets of resonant heating modules, the connection of switches between multiple sets of resonant heating modules, and the activation of corresponding drive power transistors, so that the multiple sets of resonant heating modules corresponding to multiple cookwares heat at the same frequency; or According to the second heating command, the switches corresponding to multiple sets of resonant heating modules are closed simultaneously and the corresponding drive power transistors are turned on. The switches connecting multiple sets of resonant heating modules are disconnected simultaneously or at different times, so that the multiple sets of resonant heating modules corresponding to multiple cookwares are heated at the same frequency or alternately. One set of resonant heating modules includes at least two resonant heating modules.

10. An electromagnetic cooker, characterized in that, The induction cooker includes the resonant circuit described in any one of claims 1 to 7.

Images