Electromagnetic heating circuit, control method and related devices
By adjusting the complementary pulse frequency and power output voltage of the electromagnetic heating circuit, the problem of poor temperature control at low power in electromagnetic heating technology was solved, and the stepless power variation and temperature control capability of the electromagnetic heating circuit were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GREE ELECTRIC APPLIANCE INC OF ZHUHAI
- Filing Date
- 2022-08-09
- Publication Date
- 2026-06-09
AI Technical Summary
Existing electromagnetic heating technology has poor temperature control at low power, vague power control, and a poor user experience.
By comparing the current output power of the electromagnetic heating circuit with the target power, the frequency of the complementary pulse and the output voltage of the power supply are adjusted to make the output power of the electromagnetic heating circuit equal to the target power. A circuit structure composed of IGBTs and resonant capacitors is adopted, and the oscillation frequency of the circuit is controlled by a microcontroller chip to achieve stepless power variation.
It achieves stepless power variation in electromagnetic heating circuit, improves constant temperature capability, and enhances heating stability and user experience at low power.
Smart Images
Figure CN115243412B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electromagnetic heating technology, and in particular to an electromagnetic heating circuit, control method and related equipment. Background Technology
[0002] Electromagnetic heating (IH) technology, as an emerging heating technology, uses the magnetic force generated when current flows to the heating coil to directly heat the entire inner pot. It has many advantages such as no open flame, no exhaust gas, and high thermal efficiency, and is one of the key heating technologies for the future new energy era.
[0003] Currently, IH (Induction Heating) technology is widely used in industry and daily life. IH primarily converts mains electricity into direct current (DC) through rectification and filtering. This DC current generates a high-frequency changing magnetic field within an electromagnetic coil. The pot, made of magnetically conductive material, cuts through this magnetic field, generating tiny eddy currents. These eddy currents then heat the pot due to their electrothermal effect, thus creating an energy conversion process of "electricity-magnetism-electricity-heat".
[0004] Currently, most IH products use multi-level control, which involves setting different levels and controlling the power at those preset levels. There is also continuous power control, but these products have a high lower power limit, often requiring intermittent heating to maintain a constant temperature at lower power levels, resulting in a poor user experience. In addition, their power control is somewhat vague and their temperature control capability is poor. Summary of the Invention
[0005] To address the aforementioned problems, this application provides an electromagnetic heating circuit, control method, and related equipment, which can achieve inorganic power changes and improve temperature control capabilities.
[0006] This application provides an electromagnetic heating circuit, including: a first IGBT, a second IGBT, a first resonant capacitor, a second resonant capacitor, a first coil, and a second coil. The collector of the first IGBT is connected to the positive terminal of a power supply. The emitter of the first IGBT is connected to the collector of the second IGBT and the first coil. The emitter of the second IGBT is connected to the negative terminal of the power supply. A first terminal of the first resonant capacitor is connected to the positive terminal of the power supply. A second terminal of the first resonant capacitor is connected to the second coil and the first terminal of the second resonant capacitor. A second terminal of the second resonant capacitor is connected to the negative terminal of the power supply. The gates of the first and second IGBTs are connected to a driving circuit. The driving circuit outputs complementary pulses to drive the first IGBT to turn on and the second IGBT to turn off, or to drive the first IGBT to turn off and the second IGBT to turn on.
[0007] This application provides a control method applied to the electromagnetic heating circuit described above, including:
[0008] Obtain the output power of the electromagnetic heating circuit during the current operating cycle;
[0009] The current power is compared with the target power to obtain a comparison result;
[0010] Based on the comparison results, adjust the complementary pulse and / or the output voltage of the power supply so that the output power of the electromagnetic heating circuit is equal to the target power.
[0011] In some embodiments, adjusting the complementary pulse and / or the output voltage of the power supply based on the comparison result includes:
[0012] If the comparison result indicates that the current power is less than the target power, reduce the frequency of the complementary pulse;
[0013] If the frequency of the reduced complementary pulse reaches the resonant frequency of the electromagnetic heating circuit, the current frequency of the complementary pulse is maintained, and the output voltage of the power supply is increased.
[0014] In some embodiments, adjusting the complementary pulse and / or the output voltage of the power supply based on the comparison result includes:
[0015] If the comparison result indicates that the current power is greater than the target power, the current frequency of the complementary pulse is increased, and the output voltage of the power supply is decreased.
[0016] In some embodiments, the method further includes:
[0017] When the frequency of the increased complementary pulse reaches the preset maximum value, and the power corresponding to the output voltage after the power supply is reduced to the minimum value is less than the target power, the output duty cycle of the complementary pulse is reduced.
[0018] In some embodiments, adjusting the complementary pulse and / or the output voltage of the power supply based on the comparison result includes:
[0019] If the comparison result indicates that the current power is equal to the target power, the frequency of the complementary pulse is maintained, and the current output voltage of the power supply is maintained.
[0020] This application provides a control device, including:
[0021] The acquisition module is used to acquire the output power of the electromagnetic heating circuit during the current operating cycle.
[0022] The comparison module is used to compare the current power with the target power to obtain a comparison result;
[0023] An adjustment module is configured to adjust the output voltage of the complementary pulse and / or the power supply based on the comparison result, so that the output power of the electromagnetic heating circuit is equal to the target power.
[0024] This application provides an electronic device, including a memory and a processor. The memory stores a computer program, which, when executed by the processor, performs the control method described above.
[0025] This application provides an electromagnetic heating product, including: the electronic device and the electromagnetic heating circuit described above. The electronic device is connected to the first IGBT and the second IGBT through the driving circuit, and the electronic device is communicatively connected to the power supply.
[0026] This application provides a computer-readable storage medium storing a computer program that can be executed by one or more processors and can be used to implement the control method described above.
[0027] This application provides an electromagnetic heating circuit, control method, and related equipment. By acquiring the output power of the electromagnetic heating circuit during its current operating cycle, comparing the current power with the target power to obtain a comparison result, and adjusting the output voltage of the complementary pulse and / or the power supply based on the comparison result, the output power of the electromagnetic heating circuit can be made equal to the target power, thereby achieving inorganic power change and improving constant temperature capability. Attached Figure Description
[0028] The present application will be described in more detail below based on embodiments and with reference to the accompanying drawings.
[0029] Figure 1 This is a schematic diagram of the structure of an electromagnetic heating circuit provided in an embodiment of this application;
[0030] Figure 2 A schematic diagram illustrating the implementation flow of a control method provided in an embodiment of this application;
[0031] Figure 3 A schematic diagram illustrating the implementation flow of a control method provided in an embodiment of this application;
[0032] Figure 4 A schematic diagram of a control device provided in an embodiment of this application;
[0033] Figure 5 This is a schematic diagram of the composition structure of the electronic device provided in the embodiments of this application.
[0034] In the accompanying drawings, the same parts are referred to by the same reference numerals, and the drawings are not drawn to scale. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0036] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.
[0037] If the application documents contain similar descriptions such as "first, second, third", the following explanation shall be added: In the following description, the terms "first, second, third" are used only to distinguish similar objects and do not represent a specific order of objects. It is understood that "first, second, third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.
[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.
[0039] Example 1:
[0040] Based on the problems existing in related technologies, this application provides an electromagnetic heating circuit, which includes: a first IGBT, a second IGBT, a first resonant capacitor, a second resonant capacitor, a first coil, and a second coil. The collector of the first IGBT is connected to the positive terminal of a power supply. The emitter of the first IGBT is connected to the collector of the second IGBT and the first coil. The emitter of the second IGBT is connected to the negative terminal of the power supply. The first terminal of the first resonant capacitor is connected to the positive terminal of the power supply. The second terminal of the first resonant capacitor is connected to the second coil and the first terminal of the second resonant capacitor. The second terminal of the second resonant capacitor is connected to the negative terminal of the power supply. The gates of the first and second IGBTs are connected to a driving circuit. The driving circuit outputs complementary pulses to drive the first IGBT to turn on and drive the second IGBT to turn off, or to drive the first IGBT to turn off and drive the second IGBT to turn on.
[0041] In this embodiment, the first IGBT and the second IGBT are insulated-gate bipolar transistors, and the first coil disk and the second coil disk are electromagnetic coils. The power supply can be a power supply with a power factor correction module, and the output voltage of the power supply can be adjusted. The driving circuit can be connected to an electronic device to receive control from the electronic device to determine whether to turn the first IGBT on and drive the second IGBT off, or to drive the first IGBT off and drive the second IGBT on. In this embodiment, the frequency of the complementary pulse can be adjusted by receiving control from the electronic device. The frequency of the complementary pulse can be increased, decreased, or kept constant. The frequency of the complementary pulse is between 20 and 45 kHz.
[0042] Figure 1 This is a schematic diagram of an electromagnetic heating circuit provided in an embodiment of this application, as shown below. Figure 1 As shown, in Figure 1 In the circuit, the first IGBT is 1, the second IGBT is 2, the first resonant capacitor is 5, the second resonant capacitor is 6, the first coil disk is 3 and the second coil disk is 4, and the gates of the first IGBT and the second IGBT are connected to the driving circuit.
[0043] Based on the aforementioned electromagnetic heating circuit, this application provides a control method applied to an electronic device, which may be a computer, mobile terminal, controller, server, etc. In some embodiments, the electronic device may be installed on an electromagnetic heating product, which includes an electronic device and an electromagnetic heating circuit. The electronic device is communicatively connected to the first and second IGBTs via a drive circuit, and is also communicatively connected to a power supply. Specifically, the electronic device is communicatively connected to the power factor correction module of the power supply. The electromagnetic heating product may be a rice cooker, induction cooker, electric frying pan, etc. The functions implemented by the control method provided in this application can be achieved by the processor of the electronic device calling program code, wherein the program code can be stored in a computer storage medium.
[0044] This application provides a control method. Figure 2 This is a schematic diagram illustrating the implementation flow of a control method provided in an embodiment of this application, as shown below. Figure 2 As shown, it includes:
[0045] Step S101: Obtain the output power of the electromagnetic heating circuit during the current operating cycle.
[0046] In this embodiment, a data acquisition module can be installed on the electromagnetic heating circuit to obtain information such as voltage and current from the electromagnetic heating circuit. The data acquisition module can be a current sensor or a voltage sensor. An electronic device is communicatively connected to the data acquisition module to read the voltage, current, and other information of the electromagnetic heating circuit in real time.
[0047] In this embodiment of the application, one operating cycle of the electromagnetic heating current includes: the first IGBT is turned on, at which time the power supply charges the coil and resonant capacitor through the first IGBT; when the current crosses zero, the first IGBT is turned off, and the second IGBT is turned on, at which time the resonant capacitor discharges through the coil and the second IGBT.
[0048] In this embodiment of the application, after the electronic device obtains the voltage and current of the current operating cycle, it can calculate the output power of the current operating cycle.
[0049] Step S102: Compare the current power with the target power to obtain a comparison result.
[0050] In this embodiment, the target power is set by the user. The comparison result may include: the current power is greater than the target power, the current power is less than the target power, and the current power is equal to the target power.
[0051] Step S103: Adjust the output voltage of the complementary pulse and / or the power supply based on the comparison result so that the output power of the electromagnetic heating circuit is equal to the target power.
[0052] In this embodiment of the application, adjusting the complementary pulse may involve adjusting the frequency and duty cycle of the complementary pulse. During adjustment, the frequency or duty cycle may be increased or decreased.
[0053] In this embodiment of the application, adjusting the output voltage of the power supply can be done by increasing the output voltage of the power supply, decreasing the output voltage of the power supply, or keeping the output voltage of the power supply constant.
[0054] In this embodiment, the power is different at different frequencies, and the power reaches its maximum when the frequency reaches the resonant frequency of the circuit.
[0055] This application provides a control method that obtains the output power of the electromagnetic heating circuit during its current operating cycle; compares the current power with the target power to obtain a comparison result; and adjusts the output voltage of the complementary pulse and / or the power supply based on the comparison result so that the output power of the electromagnetic heating circuit is equal to the target power. This method enables inorganic power change and improves constant temperature capability.
[0056] In some embodiments, step S103 can be implemented by the following steps:
[0057] Step S31: If the comparison result indicates that the current power is less than the target power, reduce the frequency of the complementary pulse.
[0058] In this embodiment, after reducing the frequency of the complementary pulse, it is necessary to further determine whether the current power corresponding to the reduced frequency is less than the target power. If the current power is less than the target power, the frequency of the complementary pulse needs to be reduced further. That is, the frequency of the complementary pulse can be reduced at least once.
[0059] Step S32: When the frequency of the reduced complementary pulse reaches the resonant frequency of the electromagnetic heating circuit, maintain the current frequency of the complementary pulse and increase the output voltage of the power supply.
[0060] In this embodiment of the application, when the frequency of the reduced complementary pulse reaches the resonant frequency of the electromagnetic heating circuit, the power utilization rate is the highest. However, at this time, the current power corresponding to the reduced frequency is still less than the target power. At this time, by increasing the output voltage of the power supply, the voltage of the first IGBT port can be increased, thereby increasing the current when turned on, and thus increasing the output power. When increasing the output voltage, it can also be increased at least once.
[0061] In this embodiment, the adjustment magnitude of voltage or frequency can be set according to different electromagnetic heating products.
[0062] In some embodiments, step S103 further includes:
[0063] Step S33: If the comparison result indicates that the current power is greater than the target power, increase the current frequency of the complementary pulse and decrease the output voltage of the power supply.
[0064] In this embodiment, by increasing the current frequency of the complementary pulse and decreasing the output voltage of the power supply, the voltage at the port of the first IGBT can be reduced, thereby reducing the current when the first IGBT is turned on, and thus reducing the output power.
[0065] In some embodiments, after step S103, the method further includes:
[0066] Step S104: When the frequency of the increased complementary pulse reaches the preset maximum value, and the power corresponding to the output voltage after the power supply is reduced to the minimum value is greater than the target power, reduce the output duty cycle of the complementary pulse.
[0067] In this application, after the frequency of the increased complementary pulse reaches a preset maximum value and the output voltage of the reduced power supply reaches a minimum value, the output power of the electromagnetic heating circuit during the operating cycle after the frequency of the increased complementary pulse reaches a preset maximum value and the output voltage of the reduced power supply reaches a minimum value is further acquired. When the power corresponding to the frequency of the increased complementary pulse reaching a preset maximum value and the output voltage of the reduced power supply reaching a minimum value is greater than the target power, the output duty cycle of the complementary pulse is reduced in order to further reduce the current power.
[0068] In some embodiments, step S103 can be implemented by the following steps:
[0069] Step S34: If the comparison result indicates that the current power is equal to the target power, maintain the frequency of the complementary pulse and maintain the current output voltage of the power supply.
[0070] Example 2
[0071] Based on the foregoing embodiments, this application provides another electromagnetic heating circuit and its control method. In the hardware aspect of the electromagnetic heating circuit, IGBT half-bridge control is adopted, PFC control of the load voltage is set, and dual IGBT control circuit resonance is adopted at the back end. The circuit oscillation frequency is controlled by a microcontroller chip, and the overall output power is adjusted by both voltage and oscillation frequency to achieve stepless power output effect.
[0072] See also Figure 1 The entire circuit is driven by complementary pulses from outputs ① and ②. The maximum power is obtained when the circuit resonates. At this time, when IGBT ① is turned on, the power supply charges capacitors ⑤ and ⑥ through IGBT ①, the two ends of the coil disk ③ and ④. When the current crosses zero, the upper transistor is turned off and the lower transistor is turned on. At this time, capacitors ⑤ and ⑥ discharge to ground through the two ends of the coil disk ④ and ③, and IGBT ②, thus achieving one cycle of operation.
[0073] Figure 3 This is a schematic diagram illustrating the implementation flow of a control method provided in an embodiment of this application, as shown below. Figure 3 As shown, it includes:
[0074] Step S301: Start the electromagnetic heating product.
[0075] Step S302, power calculation.
[0076] Step S303, target power comparison.
[0077] In this embodiment of the application, if the calculated power is less than the target power, step S304 is executed; if the calculated power is greater than the target power, step S305 is executed.
[0078] Step S304: Reduce the frequency and increase the PFC output (similar to increasing the power supply output voltage in the above embodiment).
[0079] After step S305, step S302 is executed.
[0080] Step S305: Increase the frequency and decrease the PFC output (same as decreasing the power supply output voltage in the above embodiment).
[0081] In this embodiment of the application, after step S305, step S302 is executed.
[0082] Step S306: Reduce the duty cycle of the complementary pulse.
[0083] During operation, the current power is compared with the target power. When the current power is less than the target power, the complementary pulse frequency is reduced. When the frequency is detected to have reached the resonant frequency, the frequency is kept constant. At this point, the PFC voltage output is increased, raising the IGBT port voltage (①), thereby increasing the turn-on current and thus increasing the output power. When the current power is greater than the target power, the complementary pulse frequency is increased while the PFC output is reduced, thereby reducing the IGBT port voltage (①), thus reducing the turn-on current and thus reducing the output power. When the frequency has reached the preset maximum value and the PFC output voltage has reached the preset minimum value, but the current power is still greater than the set power, the complementary pulse output duty cycle is reduced, further reducing the output power.
[0084] The above control method solves the problem of intermittent heating under low power in IH heating products, realizes stepless power variation of IH heating products, improves constant temperature capability, and achieves constant power heating under low power.
[0085] Example 3
[0086] Based on the foregoing embodiments, this application provides a control device. The modules and units included in the device can be implemented by a processor in a computer device; of course, they can also be implemented by specific logic circuits. In the implementation process, the processor can be a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP), or a field programmable gate array (FPGA), etc.
[0087] This application provides a control device. Figure 4This is a schematic diagram of the structure of a control device provided in an embodiment of this application, such as... Figure 4 As shown, the control device 400 includes:
[0088] The acquisition module 401 is used to acquire the output power of the electromagnetic heating circuit in the current operating cycle;
[0089] The comparison module 402 is used to compare the current power with the target power to obtain a comparison result;
[0090] The adjustment module 403 is used to adjust the output voltage of the complementary pulse and / or the power supply based on the comparison result, so that the output power of the electromagnetic heating circuit is equal to the target power.
[0091] In some embodiments, the adjustment module 403 is configured to: reduce the frequency of the complementary pulse when the comparison result indicates that the current power is less than the target power; and maintain the current frequency of the complementary pulse and increase the output voltage of the power supply when the frequency of the reduced complementary pulse reaches the resonant frequency of the electromagnetic heating circuit.
[0092] In some embodiments, the adjustment module 403 is further configured to increase the current frequency of the complementary pulse and decrease the output voltage of the power supply when the comparison result indicates that the current power is greater than the target power.
[0093] In some embodiments, the control device 400 is further configured to reduce the output duty cycle of the complementary pulse when the frequency of the increased complementary pulse reaches a preset maximum value and the power corresponding to the output voltage after the power supply is reduced to a minimum value is less than the target power.
[0094] In some embodiments, the adjustment module 403 is further configured to maintain the frequency of the complementary pulse and maintain the current output voltage of the power supply when the comparison result indicates that the current power is equal to the target power.
[0095] It should be noted that, in the embodiments of this application, if the above-described control method is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), magnetic disks, or optical disks. Thus, the embodiments of this application are not limited to any specific hardware and software combination.
[0096] Accordingly, embodiments of this application provide a computer-readable storage medium storing a computer program thereon, characterized in that the computer program, when executed by a processor, implements the steps in the control method provided in the above embodiments.
[0097] Example 4
[0098] This application provides an electronic device; Figure 5 This is a schematic diagram of the composition structure of the electronic device provided in the embodiments of this application, such as... Figure 5 As shown, the electronic device 700 includes: a processor 701, at least one communication bus 702, a user interface 703, at least one external communication interface 704, and a memory 705. The communication bus 702 is configured to enable communication between these components. The user interface 703 may include a display screen, and the external communication interface 704 may include standard wired and wireless interfaces. The processor 701 is configured to execute a program of a control method stored in the memory to implement the steps of the control method provided in the above embodiments.
[0099] The descriptions of the above embodiments of the electronic devices and storage media are similar to those of the above method embodiments, and have similar beneficial effects. For technical details not disclosed in the embodiments of the computer devices and storage media of this application, please refer to the descriptions of the method embodiments of this application for understanding.
[0100] It should be noted that the descriptions of the storage medium and device embodiments above are similar to the descriptions of the method embodiments above, and have similar beneficial effects. For technical details not disclosed in the storage medium and device embodiments of this application, please refer to the descriptions of the method embodiments of this application for understanding.
[0101] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely descriptive and do not represent the superiority or inferiority of the embodiments.
[0102] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0103] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.
[0104] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units. They may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.
[0105] In addition, each functional unit in the various embodiments of this application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.
[0106] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media that can store program code, such as mobile storage devices, read-only memory (ROM), magnetic disks, or optical disks.
[0107] Alternatively, if the integrated units described above are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a controller to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROMs, magnetic disks, or optical disks.
[0108] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A control method, characterized in that, This invention relates to an electromagnetic heating circuit, comprising: a first IGBT, a second IGBT, a first resonant capacitor, a second resonant capacitor, a first coil, and a second coil. The collector of the first IGBT is connected to the positive terminal of a power supply. The emitter of the first IGBT is connected to the collector of the second IGBT and the first coil. The emitter of the second IGBT is connected to the negative terminal of the power supply. A first terminal of the first resonant capacitor is connected to the positive terminal of the power supply. A second terminal of the first resonant capacitor is connected to the second coil and the first terminal of the second resonant capacitor. A second terminal of the second resonant capacitor is connected to the negative terminal of the power supply. The gates of the first and second IGBTs are connected to a driving circuit. The driving circuit outputs complementary pulses to drive the first IGBT to turn on and the second IGBT to turn off, or to drive the first IGBT to turn off and the second IGBT to turn on. The method includes: Obtain the output power of the electromagnetic heating circuit during the current operating cycle; The current power is compared with the target power to obtain the comparison result; Based on the comparison results, adjust the complementary pulse and / or the output voltage of the power supply so that the output power of the electromagnetic heating circuit is equal to the target power; Adjusting the complementary pulse and / or the output voltage of the power supply based on the comparison result includes: If the comparison result indicates that the current power is less than the target power, reduce the frequency of the complementary pulse; If the frequency of the reduced complementary pulse reaches the resonant frequency of the electromagnetic heating circuit, and the current power corresponding to the reduced frequency is still less than the target power, the current frequency of the complementary pulse is maintained to maximize power utilization and increase the output voltage of the power supply. If the comparison result indicates that the current power is greater than the target power, increase the current frequency of the complementary pulse and decrease the output voltage of the power supply. The method further includes: When the frequency of the increased complementary pulse reaches the preset maximum value, and the power corresponding to the output voltage after the power supply is reduced to the minimum value is greater than the target power, the output duty cycle of the complementary pulse is reduced.
2. The method according to claim 1, characterized in that, Adjusting the complementary pulse and / or the output voltage of the power supply based on the comparison result includes: If the comparison result indicates that the current power is equal to the target power, the frequency of the complementary pulse is maintained, and the current output voltage of the power supply is maintained.
3. A control device for implementing the control method according to any one of claims 1-2, characterized in that, include: The acquisition module is used to acquire the output power of the electromagnetic heating circuit during the current operating cycle. The comparison module is used to compare the current power with the target power to obtain a comparison result; An adjustment module is used to adjust the output voltage of the complementary pulse and / or the power supply based on the comparison result, so that the output power of the electromagnetic heating circuit is equal to the target power.
4. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, performs the control method as described in any one of claims 1 to 2.
5. An electromagnetic heating product, characterized in that, include: The electronic device of claim 4 is connected to the first IGBT and the second IGBT via the driving circuit, and the electronic device is communicatively connected to the power supply.
6. A storage medium, characterized in that, The computer program stored in the storage medium can be executed by one or more processors and can be used to implement the control method as described in any one of claims 1 to 2.