Control method and device of electromagnetic heating equipment and electromagnetic heating equipment

Abstract

The invention discloses a control method and device of electromagnetic heating equipment and the electromagnetic heating equipment, and relates to the technical field of the electromagnetic heating equipment, the electromagnetic heating equipment comprises a plurality of wire coils, and the control method of the electromagnetic heating equipment comprises the steps that the target power and the preset pulse width modulation period of the electromagnetic heating equipment are acquired; determining the working power of each wire coil according to the target power; calculating a wave loss parameter of each wire coil according to a preset pulse width modulation period; controlling each wire coil to work according to the calculated wave loss parameter, so that the output power of each wire coil reaches the corresponding working power; according to the technical scheme provided by the invention, the problems of low heating efficiency and abnormal noise caused by complex coordination of wire coil power distribution and heating duration in zone-free heating control of the existing induction cooker can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic heating devices, and particularly to a control method, device and electromagnetic heating device for an electromagnetic heating device. Background Art

[0002] With the continuous development of electromagnetic technology, household induction cookers have been continuously popularized. Users hope that the cookware can be heated in any area and automatically match different cookware sizes. However, when the existing induction cookers perform zone-free heating control on multiple coils, many factors may need to be considered, such as the power distribution of different coils and the coordination of heating time, resulting in a more complex design and implementation of the control strategy. And due to the complex control, the heating capacity of the coils may not be fully utilized, making the heating process consume more time and energy, resulting in low efficiency. During the zone-free heating process, abnormal sounds may be generated by the induction cooker due to factors such as unstable working states of the coils and electromagnetic interference, affecting the user experience. Summary of the Invention

[0003] The main object of the present invention is to provide a control method, device and electromagnetic heating device for an electromagnetic heating device, aiming to solve the problems of low heating efficiency and abnormal noise caused by the complex coordination of coil power distribution and heating duration in the zone-free heating control of the existing induction cookers.

[0004] To achieve the above object, a control method for an electromagnetic heating device according to the present invention, the electromagnetic heating device includes a plurality of coils, and the control method of the electromagnetic heating device includes: Obtain the target power and preset pulse width modulation period of the electromagnetic heating device; Determine the working power of each of the coils according to the target power; Calculate the wave loss parameters of each of the coils according to the preset pulse width modulation period; Control each of the coils to work according to the calculated wave loss parameters, so that the output power of each of the coils reaches the corresponding working power.

[0005] In an embodiment, the step of obtaining the target power and preset pulse width modulation period of the electromagnetic heating device further includes: Obtain the state of the current cookware; The step of calculating the wave loss parameters of each of the coils according to the preset pulse width modulation period specifically includes: Determine the working mode of the electromagnetic heating device according to the state of the cookware and the working power, the working mode includes a same-frequency mode and a time-sharing mode. In the same-frequency mode, the working powers of all the coils are the same. In the time-sharing mode, the working powers of at least two of the coils are different; Calculate and determine the wave loss parameters of each of the wire coils corresponding to the determined operating mode according to the preset pulse width modulation period.

[0006] In one embodiment, the step of calculating and determining the wave loss parameters of each of the wire coils corresponding to the determined operating mode according to the preset pulse width modulation period specifically includes: When it is determined that the operating mode of the electromagnetic heating device is the same-frequency mode, obtain the current moving power of the electromagnetic heating device and the current average output power of the electromagnetic heating device; Calculate the first wave loss parameter of each of the wire coils according to the preset pulse width modulation period, the current moving power, and the current average output power.

[0007] In one embodiment, the first wave loss parameter is the first wave loss duty cycle; The corresponding relationship between the first wave loss duty cycle and the current average output power is: The current average output power = the current moving power × the first wave loss duty cycle / the preset pulse width modulation period.

[0008] In one embodiment, the step of controlling each of the wire coils to operate according to the calculated wave loss parameter so that the output power of each of the wire coils reaches the corresponding operating power specifically includes: Adjust the operating frequency of the wire coil so that the current average output power of the electromagnetic heating device reaches the operating power of the wire coil; When it is determined that the operating frequency of the wire coil reaches the preset frequency and the current average output power of the electromagnetic heating device does not reach the operating power of the wire coil, adjust the first wave loss parameter of the wire coil until the current average output power of the electromagnetic heating device reaches the operating power of the wire coil.

[0009] In one embodiment, the step of calculating and determining the wave loss parameters of each of the wire coils corresponding to the determined operating mode according to the preset pulse width modulation period specifically includes: When it is determined that the operating mode of the electromagnetic heating device is the time-sharing mode, obtain the preset minimum heating unit and the number of wire coils; Calculate the second wave loss parameter of each of the wire coils according to the preset pulse width modulation period, the preset minimum heating unit, the number of wire coils, and the operating power of each of the wire coils.

[0010] In one embodiment, the second wave loss parameter includes a second wave loss duty cycle, a wave loss quotient, and a wave loss remainder; The calculation formula for the second wave loss duty cycle is: The second wave loss duty ratio = preset minimum heating unit + operating power of a single wire coil × (preset pulse width modulation period - number of wire coils × preset minimum heating unit) / the target power; The calculation formula for the wave loss quotient is: The wave loss quotient = second wave loss duty ratio of a single wire coil / minimum second wave loss duty ratio among multiple wire coils; The calculation formula for the wave loss remainder is: The wave loss remainder = second wave loss duty ratio of a single wire coil % minimum second wave loss duty ratio among multiple wire coils.

[0011] In one embodiment, the step of controlling each of the wire coils to operate according to the calculated wave loss parameters so that the output power of each wire coil reaches the corresponding operating power specifically includes: Select a single wire coil with the smallest second wave loss ratio, control the wire coil to operate with the corresponding wave loss quotient number of preset minimum heating units, and control all wire coils with non - zero wave loss quotients to operate with the corresponding wave loss quotient plus one preset minimum heating unit, and loop for the number of cycles of the minimum wave loss quotient; And / or, select a single wire coil with the smallest second wave loss ratio, control the wire coil to operate with the corresponding wave loss quotient number of preset minimum heating units, and control the wire coils with wave loss quotients greater than the minimum wave loss quotient to operate with the corresponding wave loss quotient plus one preset minimum heating unit, and loop for the number of cycles of the difference between the other non - zero wave loss remainders and the minimum non - zero wave loss remainder; Control all wire coils to operate with their respective corresponding wave loss quotient number of preset minimum heating units, and loop for a preset number of cycles; Wherein, the sum of the number of preset minimum heating units included in the number of cycles of the minimum non - zero wave loss remainder, the number of cycles of the difference, and the preset number of cycles is equal to the total number of preset minimum heating units in the preset pulse width modulation period.

[0012] The present invention also provides a control device for an electromagnetic heating device, including: A memory; A processor, and a control program for the electromagnetic heating device stored on the memory and executed by the processor. When the control program for the electromagnetic heating device is executed by the processor, it implements the control method for the electromagnetic heating device as described above.

[0013] The present invention also provides an electromagnetic heating device, including the control device for the electromagnetic heating device as described above.

[0014] The technical solution of the present invention obtains the target power and the preset pulse width modulation period of the electromagnetic heating device. First, it distributes the working power that each wire coil needs to bear according to the target power, so as to achieve a reasonable distribution of the target power. Then, it calculates the wave loss parameters of each wire coil according to the obtained pulse width modulation period, and controls the multiple wire coils according to the calculated wave loss parameters, so that the output power of each wire coil reaches the corresponding working power. Through this control method, not only can the efficiency of the multi-wire coil collaborative work be improved, energy waste be avoided, but also the stability and controllability during the multi-wire coil heating process can be enhanced, and the abnormal sound problems caused by power fluctuations or electromagnetic interference can be reduced, thereby improving the user experience and enhancing the overall performance of the electromagnetic heating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0016] Figure 1 It is a flowchart of the first embodiment of the control method for the electromagnetic heating device provided by the present invention; Figure 2 It is a flowchart of the second embodiment of the control method for the electromagnetic heating device provided by the present invention; Figure 3 It is a flowchart of the third embodiment of the control method for the electromagnetic heating device provided by the present invention; Figure 4 It is a flowchart of the fourth embodiment of the control method for the electromagnetic heating device provided by the present invention; Figure 5 It is a flowchart of the fifth embodiment of the control method for the electromagnetic heating device provided by the present invention; Figure 6 It is a flowchart of the sixth embodiment of the control method for the electromagnetic heating device provided by the present invention; Figure 7 For Figure 6 It is the working timing diagram of the No. 1 wire coil and the No. 2 wire coil in the embodiment; Figure 8 For Figure 6 It is the working timing diagram of the No. 3 wire coil, the No. 4 wire coil and the No. 5 wire coil in the embodiment; Figure 9 It is a schematic diagram of the circuit function modules of an embodiment of the control device provided by the present invention; Figure 10 It is a schematic diagram of the circuit function modules of an embodiment of the electromagnetic heating device provided by the present invention.

[0017] Description of the reference numerals in the drawings: 100, electromagnetic heating device; 1, control device; 11, memory; 12, processor; 2, rectifier and filter circuit; 3, panel; 4, wire coil; 5, switching device.

[0018] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0022] With the continuous development of electromagnetic technology, household induction cookers are becoming increasingly popular. Users hope that the cookware can be heated in any area and automatically match different cookware sizes. However, when the existing induction cookers perform zone-free heating control on multiple wire coils, many factors may need to be considered, such as the power distribution of different wire coils, the coordination of heating time, etc., resulting in a more complex design and implementation of the control strategy. And due to the complex control, the heating capacity of the wire coils may not be fully utilized, making the heating process consume more time and energy and resulting in low efficiency. During the zone-free heating process, abnormal sounds may be generated by the induction cooker due to factors such as unstable working states of the wire coils and electromagnetic interference, affecting the user experience.

[0023] To solve the above problems, the present invention proposes a control method for an electromagnetic heating device 100.

[0024] Please refer to Figure 1 and Figure 10 , in an embodiment of the present invention, the electromagnetic heating device 100 includes multiple wire coils 4, and the control method of the electromagnetic heating device 100 includes: S100A. Obtain the target power and the preset pulse width modulation period of the electromagnetic heating device; S200. Determine the working power of each wire coil according to the target power; S300. Calculate the wave loss parameters of each wire coil according to the preset pulse width modulation period; S400. Control each wire coil to work according to the calculated wave loss parameters so that the output power of each wire coil reaches the corresponding working power.

[0025] In this embodiment, the electromagnetic heating device 100 can be an induction cooker, a steaming device, a stir-frying robot, etc., and is not specifically limited. The electromagnetic heating device 100 may include a panel 3, a rectifier-filter circuit 2, a switching device 5, a wire coil 4, etc. For the convenience of description, the following takes the electromagnetic heating device 100 including a panel 3, a rectifier-filter circuit 2, a switching device 5 and a wire coil 4 as an example to elaborate on its hardware structure and working principle in detail: The panel 3 can be a touch control panel 3, which is used for placing cookware and also serves as the main operation interface for users to interact with the electromagnetic heating device 100; the rectifier-filter circuit 2 can be composed of a full-wave rectifier, a half-wave rectifier and a filter, and is used to convert the externally input alternating current into direct current and remove the fluctuating components in the current to provide stable direct current; the switching device 5 can include one or more combinations of an insulated gate bipolar transistor (IGBT), a metal oxide semiconductor field effect transistor (MOSFET), and a thyristor (THYRISTOR), and is used to convert the direct current output by the rectifier-filter circuit 2 into high-frequency alternating current; the wire coil 4 can include one or two combinations of a single-layer spiral coil and a multi-layer spiral coil, and is used to generate a high-frequency alternating magnetic field when high-frequency alternating current passes through.

[0026] During the actual operation process, the working flow of the electromagnetic heating device 100 is as follows: The alternating current of the external power supply is first converted into direct current by the rectification circuit, and then after capacitor filtering, a direct current voltage higher than the peak value of the original alternating current voltage (for example, about 310V for 220V mains power) is formed, which is the so-called DC bus voltage. Subsequently, this DC voltage is converted into a high-frequency alternating current voltage by the switching device 5, and a high-frequency alternating magnetic field is generated when the high-frequency current passes through the wire coil 4. When a ferromagnetic cookware is placed on the panel 3, under the action of the high-frequency alternating magnetic field, the bottom of the pot cuts the magnetic force lines to generate induced current, and according to the eddy current effect, these currents are converted into heat energy at the bottom of the pot, thereby realizing the heating of food.

[0027] To further improve the heating efficiency and uniformity and enhance the flexibility of use, multiple wire coils 4 are provided in this embodiment. The multiple wire coils 4 can simultaneously heat different areas of the bottom of the pot, thereby accelerating the heating rate and shortening the cooking time. Compared with a single wire coil 4, the multiple wire coils 4 can effectively improve the problem of uneven heat distribution at the bottom of the pot. Especially when using a larger cookware, it is more conducive to the uniform distribution of heat, avoiding the situation of food burning or insufficient heating. In addition, for cookwares of different sizes, the electromagnetic heating device 100 with multiple wire coils 4 can automatically select a suitable combination of wire coils 4 to work according to the size of the cookware, and even support the simultaneous use of multiple cookwares of different sizes without interference.

[0028] It should be noted that some existing electromagnetic heating devices 100 (such as some induction cookers) have also adopted multiple wire coils 4 to achieve "zone-free heating". "Zone-free heating" refers to a heating method in which when the cookware covers multiple wire coils 4, no explicit zone control is performed, making the overall heating of the cookware more uniform. However, there are still several technical bottlenecks in the zone-free heating control of the current electromagnetic heating device 100: First, the control strategy is complex, and factors such as power distribution between the wire coils 4 and heating time coordination need to be comprehensively considered, with great difficulty in design and implementation; second, due to the high control complexity, it is difficult to fully utilize the maximum heating capacity of each wire coil 4, resulting in an increase in heating time and energy consumption, affecting the overall efficiency; third, problems such as unstable working states of the wire coils 4 or electromagnetic interference may occur during the heating process, thereby causing abnormal noise and reducing the user experience. Thus, although the multi-wire coil 4 structure has significant advantages in improving the heating performance, how to achieve efficient, stable, and intelligent control is still a key problem that urgently needs to be solved.

[0029] In response to this challenge, the present invention proposes a control method for the electromagnetic heating device 100, aiming to solve the problems of low heating efficiency and abnormal noise caused by the complex coordination of power distribution and heating duration of the wire coils 4 in the zone-free heating control of existing induction cookers.

[0030] In this embodiment, the control method of the electromagnetic heating device 100 mainly includes the following three steps: First, in step S100A, the electromagnetic heating device 100 obtains its target power and a preset pulse width modulation (PWM) period, which can provide basic data for subsequent power distribution and control. Among them, the target power is the heating power that needs to be achieved as set by the user or determined by the electromagnetic heating device 100 according to the cooking requirements. Pulse width modulation (PWM) is a technology that equivalently obtains the required waveform (including shape and amplitude) by modulating the widths of a series of pulses. The preset pulse width modulation period is the time length of a complete cycle of the PWM signal that is preset in advance, and this period can determine the basic frequency of the modulation signal. Then, in step S200, the electromagnetic heating device 100 determines the working power that each coil 4 should bear according to the obtained target power, so as to achieve reasonable power distribution. For example, when the electromagnetic heating device 100 detects that the cookware on the panel 3 is large, multiple coils 4 may need to work simultaneously to provide sufficient heating capacity. Suppose the target power is 100W and the electromagnetic heating device 100 is configured with two coils 4, then the power can be evenly distributed to 50W each, or unevenly distributed according to actual needs, such as 60W and 40W. If the cookware is small, only some of the coils 4 can be selected to work according to the actual situation. For example, when the electromagnetic heating device 100 is configured with three coils 4 and the target power is still 100W, two of the coils 4 can be selected to work. These two coils 4 can work simultaneously or work successively at a certain time interval, and the power distributed to each of them can be the same or different. Through this power distribution method, not only can the adaptability of the electromagnetic heating device 100 be improved, but also energy waste can be avoided.

[0031] Finally, in steps S300 and S400, the electromagnetic heating device 100 calculates the wave-drop parameters required for each coil 4 based on a preset pulse width modulation (PWM) period, and controls each coil 4 according to these calculation results to ensure that each coil 4 can output an actual power corresponding to the working power allocated to it. To achieve this goal, it is necessary to calculate the wave-drop parameters of each coil 4 based on a preset pulse width modulation (PWM) period. This is because in the process of multiple coils 4 working together, precise power control and time coordination must be achieved by adjusting the turn-on and turn-off of each coil 4. The so-called wave-drop parameter refers to the number of turn-on times that a certain coil 4 is skipped or "discarded" within a complete PWM period. In other words, it can reflect the number of time periods during which the coil 4 is not activated within a period, thereby indirectly determining the proportion of its actual working duration and the magnitude of the output power. Specifically, a PWM period can be composed of several preset minimum heating units, and each minimum heating unit can be a half-wave or other set basic time unit. For example, assuming that a PWM period contains 50 preset minimum heating units, the actual turn-on duration of the coil 4 within this period can be controlled by adjusting how many of these units are "skipped" or not working, thereby adjusting its output power. This adjustment method makes the power control of the coil 4 more flexible and precise, especially suitable for complex scenarios where multiple coils 4 work together.

[0032] To more clearly illustrate the role of the wave skipping parameter and its regulation method, it can be exemplified through two typical scenarios: When a relatively large-sized cookware is placed on the panel 3 of the electromagnetic heating device 100, multiple wire coils 4 may need to work simultaneously to provide sufficient heating capacity. For example, in the case where the electromagnetic heating device 100 is configured with two wire coils 4, if it is detected that the cookware covers both wire coils 4, and the electromagnetic heating device 100 determines that a relatively high target power is required, a relatively high operating power will be allocated to these two wire coils 4. At this time, the electromagnetic heating device 100 can set the wave skipping parameters of the two wire coils 4 to be smaller, that is, reduce the minimum number of heating units skipped by each of the two wire coils 4 within one PWM cycle, so that the two wire coils 4 are in the working state for a longer duration, increase their respective output powers, and further increase the overall average output power of the wire coils 4 to meet the requirements of rapid and uniform heating of large cookware. Conversely, when a relatively small-sized cookware is placed on the panel 3, to avoid local overheating of the cookware or energy waste, only some of the wire coils 4 may need to work, or even if multiple wire coils 4 work simultaneously, the output power of some wire coils 4 needs to be reduced. Still taking the two wire coils 4 as an example, if the cookware only covers one of the wire coils 4 and the other wire coil 4 only serves as an auxiliary, the electromagnetic heating device 100 can allocate a relatively high operating power to the covered wire coil 4 and a relatively low operating power to the auxiliary wire coil 4. At this time, the electromagnetic heating device 100 can reduce the number of the minimum heating units skipped by the covered wire coil 4 within one PWM cycle, so that it is in the working state for a longer duration to reach its allocated operating power; at the same time, increase the wave skipping parameter of the auxiliary wire coil 4, that is, increase the number of the minimum heating units skipped by it within one PWM cycle, so that it is in the non-working state for a longer duration to reduce its output power and also reach its allocated operating power. That is to say, in these two scenarios, by adjusting the wave skipping parameters of the two wire coils 4 under different cookware conditions respectively, it is possible to achieve fine-tuning and matching of the output powers of each wire coil 4 while maintaining the overall operating stability of the electromagnetic heating device 100, thereby optimizing the power balance among multiple wire coils 4 and the coordination of the heating process.

[0033] The technical solution of the present invention provides basic parameters for subsequent control by obtaining the target power and the preset pulse width modulation (PWM) period; then reasonably distributes the working power of each coil 4 according to the target power to adapt to the heating requirements of cookware of different sizes; finally calculates the wave loss parameters of each coil 4 based on the PWM period and controls them according to the calculated wave loss parameters to ensure that each coil 4 outputs an actual power matching its allocated working power. Through this control method, not only can the efficient cooperation and power balance among multiple coils 4 be achieved, but also the overall heating speed and energy efficiency of the electromagnetic heating device 100 can be improved, energy waste can be reduced, and at the same time, abnormal noise caused by unstable coil 4 states or electromagnetic interference can be reduced, optimizing the user experience. In summary, this control method can systematically solve the key technical problems in zone-free heating from three aspects: power distribution, time coordination, and dynamic regulation, providing a practical technical solution for realizing intelligent, high-efficiency, and low-noise electromagnetic heating.

[0034] Please refer to Figure 2 , in one embodiment, in step S100A, it further includes: S100B. Obtain the state of the current cookware; Step S300 specifically includes: S310. Determine the working mode of the electromagnetic heating device according to the state of the cookware and the working power. The working mode includes the same-frequency mode and the time-sharing mode. In the same-frequency mode, the working power of each coil is the same. In the time-sharing mode, the working powers of at least two coils are different; S320. Calculate the wave loss parameters of each coil corresponding to the determined working mode according to the preset pulse width modulation period.

[0035] In this embodiment, the electromagnetic heating device 100 first obtains the target power and the preset pulse width modulation (PWM) period in step S100A to provide basic data for subsequent power distribution and control. In addition, in step S100B, the state of the current cookware is further obtained, including information such as its size, placement position, and the coils 4 it covers. The acquisition of this information enables the electromagnetic heating device 100 to adjust the heating process according to the actual use situation of the cookware so as to more precisely adapt to the heating requirements.

[0036] On this basis, step S300 is entered. This step mainly includes the following two steps: First, in step S310, a suitable operating mode is selected according to the state of the cookware and the previously determined operating power. The operating modes can include the same-frequency mode and the time-sharing mode. Among them, the same-frequency mode is suitable for scenarios where the cookware covers multiple induction coils 4 and requires uniform heating. In the same-frequency mode, all induction coils 4 participating in heating will operate at the same operating power. For example, if the target power is 100W and the electromagnetic heating device 100 is equipped with two induction coils 4, these two induction coils 4 can both operate at 50W. The time-sharing mode is applicable to the situation where the cookware is small or only covers part of the induction coils 4. In the time-sharing mode, at least two induction coils 4 operate at different operating powers, so as to achieve a more flexible power distribution. For example, also at a target power of 100W, if the electromagnetic heating device 100 is also equipped with two induction coils 4, one induction coil 4 can operate at 40W, while the other operates at 60W; or, one induction coil 4 operates at 30W and the other at 70W. Another example is when the target power is still 100W but the electromagnetic heating device 100 is equipped with three induction coils 4, two of the induction coils 4 can operate at 20W respectively, and the other induction coil 4 operates at 60W. In this way, step S310 can determine the optimal operating mode according to the specific state of the cookware and the required heating power, effectively improving the heating efficiency and thermal energy utilization rate, while avoiding energy waste and local overheating problems.

[0037] Then, in step S320, the electromagnetic heating device 100 calculates the dropout parameters of each induction coil 4 corresponding to the selected operating mode based on a preset pulse width modulation period. Specifically, in the same-frequency mode, since the operating powers of all induction coils 4 are the same, their dropout parameters are also the same. This can not only simplify the calculation process of the dropout parameters of the induction coils 4, but also help to achieve the synchronization and consistency among the induction coils 4. And in the same-frequency mode, all induction coils 4 are started at the same time and maintain the same on and off rhythm, that is, the on-time duration of all induction coils 4 within one PWM period is the same, thus ensuring the uniformity and stability of heating. In the time-sharing mode, considering that at least two induction coils 4 are allocated different operating powers, that is, at least two induction coils 4 will have different dropout parameters, the electromagnetic heating device 100 will calculate the dropout parameters of each induction coil 4 respectively. For the induction coil 4 that requires a higher power output, its dropout parameter is set smaller, that is, the number of the smallest heating units skipped is reduced, so that it has a longer on-time duration within one PWM period, thereby increasing its output power; for the induction coil 4 that requires a lower power output, the number of dropout times is increased to extend its non-operating duration, thereby reducing its output power. And in the time-sharing mode, multiple induction coils 4 are started in sequence or operate with staggered peaks to coordinate their working rhythms and avoid power conflicts or electromagnetic interference caused by time overlap.

[0038] Through the synergistic effect of the above steps, this embodiment can achieve refined and intelligent management of the electromagnetic heating device 100. On the one hand, the electromagnetic heating device 100 determines a suitable working mode according to the state of the cookware and the working power allocated to each wire coil 4, calculates the wave loss parameters corresponding to this working mode based on the preset pulse width modulation (PWM) period, and then controls the actual output power of each wire coil 4 by adjusting the wave loss parameters to make it accurately match the corresponding working power, thereby improving the adaptability of the electromagnetic heating device 100 to different cookware sizes and heating requirements; on the other hand, during the collaborative operation of multiple wire coils 4, the start and stop times of each wire coil 4 are reasonably arranged to effectively avoid electromagnetic interference and power fluctuation problems caused by the simultaneous operation of multiple wire coils 4, thereby reducing the occurrence probability of abnormal noise and further optimizing the stability of the heating process and the user experience.

[0039] Please refer to Figure 3 , in one embodiment, step S320 specifically includes: S321A. When it is determined that the working mode of the electromagnetic heating device is the same-frequency mode, obtain the current moving power of the electromagnetic heating device and the current average output power of the electromagnetic heating device; S322A. Calculate the first wave loss parameter of each wire coil according to the preset pulse width modulation period, the current moving power, and the current average output power.

[0040] In this embodiment, when it is determined that the operating mode of the electromagnetic heating device 100 is the same-frequency mode, in order to achieve unified power control and coordinated operation of multiple wire coils 4, step S200 can be refined into two key sub-steps to complete the power distribution and the calculation process of the first wave-loss parameter. First, in step S210A, the electromagnetic heating device 100 obtains the current mobile power and the average output power. Among them, the mobile power refers to the total power actually output by the electromagnetic heating device 100 at present, which is used to reflect the current heating capacity or load state of the device; while the average output power refers to the average power actually output by the electromagnetic heating device 100 at present, which can reflect the stability and continuity of the overall heating process. Then, in step S220A, the electromagnetic heating device 100 calculates the first wave-loss parameter corresponding to each wire coil 4 based on the preset pulse width modulation period, the current mobile power, and the current average output power. The first wave-loss parameter can reflect how many minimum heating units (such as half-waves) each wire coil 4 should skip without working within a complete PWM cycle, thereby determining the proportion of its actual on-time, and further regulating its output power. Through this calculation process, the electromagnetic heating device 100 can ensure that in the same-frequency mode, all wire coils 4 participating in heating work at the same working power, and adjust the on-time and off-time ratio according to the actual heating demand, so that the actual average output power of the electromagnetic heating device 100 matches the working power allocated to a single wire coil 4. In this way, by obtaining the mobile power and the average output power of the electromagnetic heating device 100 and calculating the wave-loss parameters of each wire coil 4 accordingly, the coordinated control of multiple wire coils 4 can be achieved, thereby optimizing the overall heating efficiency and improving the user experience.

[0041] Please refer to Figure 3 , in one embodiment, the first wave-loss parameter is the first wave-loss duty ratio; The corresponding relationship between the first wave-loss duty ratio and the current average output power is: Current average output power = current mobile power × first wave-loss duty ratio / preset pulse width modulation period.

[0042] In this embodiment, the first wave-drop parameter is specifically defined as the first wave-drop duty cycle, which is used to characterize the proportion of the actual on-time of each wire coil 4 in a pulse width modulation (PWM) cycle. There is a clear mathematical relationship between the first wave-drop duty cycle and the current average output power, and its expression is: current average output power = current moving power × first wave-drop duty cycle / preset pulse width modulation period. For example, when the target power is 100 W and the electromagnetic heating device 100 is configured with two wire coils 4, if the working power allocated to each wire coil 4 is 50 W, and the electromagnetic heating device 100 detects that the current moving power is 100 W and the first wave-drop duty cycle used in the previous time is 20%, then the calculated current average output power is 100×20 / 50 = 40 W, which is lower than the expected 50 W. At this time, the electromagnetic heating device 100 can adjust the first wave-drop duty cycle from 20% to 25%, so that the current average output power is increased to 100×25 / 50 = 50 W, so as to match the working power allocated to a single wire coil 4. Through the technical solution of this embodiment, the electromagnetic heating device 100 can adjust the on-time ratio of each wire coil 4 based on the power data obtained in real time in the same-frequency mode, realize the precise control of the output power of multiple wire coils 4, and ensure the uniformity, stability and high efficiency of the heating process.

[0043] Please refer to Figure 4 , in one embodiment, step S400 specifically includes: S410A. Adjust the working frequency of the wire coil so that the current average output power of the electromagnetic heating device reaches the working power of the wire coil; S420A. When it is determined that the working frequency of the wire coil reaches the preset frequency and the current average output power of the electromagnetic heating device does not reach the working power of the wire coil, adjust the first wave-drop parameter of the wire coil until the current average output power of the electromagnetic heating device reaches the working power of the wire coil.

[0044] In this embodiment, step S320 can be further refined into how to ensure that the current average output power of the electromagnetic heating device 100 reaches the working power allocated to each wire coil 4 by adjusting the working frequency and the first wave-drop parameter of the wire coil 4. First, in step S321A, the electromagnetic heating device 100 tries to make the current average output power of the electromagnetic heating device 100 match the working power of the wire coil 4 by adjusting the working frequency of the wire coil 4. If it is determined in step S322A that the working frequency of the wire coil 4 has reached the preset frequency, but the current average output power of the electromagnetic heating device 100 still does not reach the working power of the wire coil 4, then adjust the first wave-drop parameter of the wire coil 4 until the current average output power of the electromagnetic heating device 100 reaches the working power allocated to each wire coil 4. Through this series of control measures, the coordinated operation of multiple wire coils 4 can be realized, the uniformity and stability of the heating process can be ensured, and at the same time, the overall heating efficiency and user experience can be optimized.

[0045] Please refer to Figure 5 , in one embodiment, step S320 specifically includes: S321B. When determining that the operating mode of the electromagnetic heating device is the time-sharing mode, obtain the preset minimum heating unit and the number of wire coils; S322B. Calculate the second wave-loss parameter of each wire coil according to the preset pulse width modulation period, the preset minimum heating unit, the number of wire coils, and the operating power of each wire coil.

[0046] In this embodiment, when it is determined that the operating mode of the electromagnetic heating device 100 is the time-sharing mode, in order to achieve the time-sharing power control and coordinated operation of multiple wire coils 4, step S320 can also be refined into two key steps to complete the power distribution and the calculation process of the second wave-loss parameter. First, in step S321B, the electromagnetic heating device 100 obtains the preset minimum heating unit and the number of wire coils 4. Since a PWM period can be composed of several preset minimum heating units, each minimum heating unit can be a half-wave or other set basic time unit. Then, in step S322B, the electromagnetic heating device 100 can calculate the second wave-loss parameter corresponding to each wire coil 4 based on the preset pulse width modulation period, the preset minimum heating unit, the number of wire coils 4, and the operating power of each wire coil 4. This process ensures that the power output by each wire coil 4 can reach its allocated operating power by adjusting the number of minimum heating units skipped by each wire coil 4 within a PWM period, so as to achieve the efficient coordinated operation of multiple wire coils 4 in the time-sharing mode, optimize the heating efficiency, and ensure the uniformity and stability of the heating process. Through these two steps, the refined control of multiple wire coils 4 in the time-sharing mode can be realized, improving the overall performance and user experience.

[0047] Please refer to Figure 5 , Figure 7 and Figure 8 , in one embodiment, the second wave-loss parameter includes the second wave-loss duty ratio, the wave-loss quotient, and the wave-loss remainder; The calculation formula for the second wave-loss duty ratio is: Second wave-loss duty ratio = preset minimum heating unit + operating power of a single wire coil 4 × (preset pulse width modulation period - number of wire coils 4 × preset minimum heating unit) / target power; The calculation formula for the wave-loss quotient is: Wave-loss quotient = second wave-loss duty ratio of a single wire coil 4 / minimum second wave-loss duty ratio among multiple wire coils 4; The calculation formula for the wave-loss remainder is: Wave-loss remainder = second wave-loss duty ratio of a single wire coil 4 % minimum second wave-loss duty ratio among multiple wire coils 4.

[0048] In this embodiment, in the time-sharing mode, the second wave-loss parameter specifically includes three key control parameters: the second wave-loss duty ratio, the wave-loss quotient, and the wave-loss remainder, which are used to achieve refined regulation of the output power of multiple wire coils 4. Among them, the second wave-loss duty ratio represents the minimum proportion of heating units that should be turned on for each wire coil 4 within a PWM cycle. Its calculation is based on a preset minimum heating unit, the working power of a single wire coil 4, a preset pulse-width modulation cycle, and the target power. The expression is: Second wave-loss duty ratio = preset minimum heating unit + working power of a single wire coil 4 × (preset pulse-width modulation cycle - number of wire coils 4 × preset minimum heating unit) / target power. This expression indicates that: on the premise of meeting the overall target power, the on-time of each wire coil 4 can be adjusted according to the working power allocated to different wire coils 4, so as to achieve precise power matching. On this basis, the electromagnetic heating device 100 further calculates the wave-loss quotient and the wave-loss remainder, which are used to coordinate the working rhythm and wave-loss allocation relationship among multiple wire coils 4. The wave-loss quotient is defined as the ratio of the second wave-loss duty ratio of a certain wire coil 4 to the smallest second wave-loss duty ratio among all wire coils 4, that is: Wave-loss quotient = second wave-loss duty ratio of a single wire coil 4 / smallest second wave-loss duty ratio among multiple wire coils 4, which is used to measure the proportional relationship of each wire coil 4 relative to the minimum on-time; and the wave-loss remainder represents the remainder part after taking the modulus of this ratio, that is: Wave-loss remainder = second wave-loss duty ratio of a single wire coil 4 % smallest second wave-loss duty ratio among multiple wire coils 4, which is used to determine the remaining on-time proportion after dividing the smallest wave-loss quotient evenly. Through the collaborative calculation of these three parameters, the electromagnetic heating device 100 can control the on and off rhythm of each wire coil 4 in the time-sharing mode, so that the wire coils 4 with different power requirements can operate orderly within the same PWM cycle, not only ensuring that their respective power output requirements are met, but also maintaining good coordination and stability. In this way, not only can the overall heating efficiency of the electromagnetic heating device 100 be improved, but also the thermal energy utilization rate can be optimized, enhancing the user experience.

[0049] To more intuitively illustrate the application of the above parameters, the following is explained through two examples: In the first example, assume that the target power is 3600W, and the electromagnetic heating device 100 is configured with two wire coils 4, namely the No. 1 wire coil 4 and the No. 2 wire coil 4. Among them, the working power allocated to the No. 1 wire coil 4 is 800W, and the working power allocated to the No. 2 wire coil 4 is 2800W. The preset pulse width modulation period is 50, and the preset minimum heating unit is 1, which can be adjusted to 2 or 3 according to actual needs. The specific duration of the preset minimum heating unit in this embodiment is 10ms, and the total duration of 50 preset minimum heating units is 500ms. Based on these assumed data, the second wave loss ratio of the No. 1 wire coil 4 can be calculated as: 1 + 800×(50 - 2×1) / 3600 = 11, and the second wave loss ratio of the No. 2 wire coil 4 is: 1 + 2800×(50 - 2×1) / 3600 = 1 + 37.33 = 38.33. Here, it should be noted that since the second wave loss duty cycle needs to be an integer and considering the priority to ensure the output capacity of the high-power wire coil 4, the second wave loss ratio of the No. 2 wire coil 4 should be: 38 + 1 = 39. From the second wave loss ratio of the No. 1 wire coil 4, its wave loss quotient can be obtained as: 11 / 11 = 1, and the wave loss remainder is: 11%11 = 0; from the second wave loss ratio of the No. 2 wire coil 4, its wave loss quotient can be obtained as: 39 / 11 = 3, and the wave loss remainder is: 39%11 = 6.

[0050] In the second example, assume that the target power is 4800W, and the electromagnetic heating device 100 is configured with three wire coils 4, namely the No. 3 wire coil 4, the No. 4 wire coil 4, and the No. 5 wire coil 4. Among them, the working power allocated to the No. 3 wire coil 4 is 800W, the working power allocated to the No. 4 wire coil 4 is 1200W, and the working power allocated to the No. 5 wire coil 4 is 2800W. The preset pulse width modulation period is 50, and the preset minimum heating unit is 1 with a specific duration of 10ms. Based on these assumed data, the second wave loss ratio of the No. 3 wire coil 4 can be calculated as: 1 + 800×(50 - 3×1) / 4800 = 1 + 7.83 = 8.83, the second wave loss ratio of the No. 4 wire coil 4 is: 1 + 1200×(50 - 3×1) / 4800 = 1 + 11.75 = 12.75, and the second wave loss ratio of the No. 5 wire coil 4 is: 1 + 2800×(50 - 3×1) / 4800 = 1 + 27.41 = 28.41. Here, it should be noted that since the second wave loss duty cycle needs to be an integer and considering the priority to ensure the output capacity of the high-power wire coil 4, the second wave loss ratio of the No. 3 wire coil 4 should be 8, the second wave loss ratio of the No. 4 wire coil 4 should be 12, and the second wave loss ratio of the No. 5 wire coil 4 should be: 28 + 2 = 30. From the second wave loss ratio of the No. 3 wire coil 4, its wave loss quotient can be obtained as: 8 / 8 = 1, and the wave loss remainder 8%8 = 0; from the second wave loss ratio of the No. 4 wire coil 4, its wave loss quotient can be obtained as: 12 / 8 = 1, and the wave loss remainder is: 12%8 = 4; from the second wave loss ratio of the No. 5 wire coil 4, its wave loss quotient can be obtained as: 30 / 8 = 3, and the wave loss remainder is: 30%8 = 6.

[0051] From these two examples, it can be seen that by introducing three parameters: the second wave-loss duty ratio, the wave-loss quotient, and the wave-loss remainder, the electromagnetic heating device 100 can achieve fine control of the multi-coil 4 in the time-sharing mode. Whether it is a two-coil 4 or a three-coil 4 structure, the electromagnetic heating device 100 can adjust the on-off ratio of each coil 4 within a PWM cycle based on the state of the cookware and the power distribution, ensuring the uniformity, stability, and efficiency of the heating process, thereby improving the performance and user experience of the electromagnetic heating device 100.

[0052] Please refer to Figures 6 to 8 , in one embodiment, step S400 specifically includes: S410B. Select a single coil with the smallest second wave-loss ratio, control the coil to work with the corresponding wave-loss quotient of preset minimum heating units, and control all coils with non-zero wave-loss quotients to work with the corresponding wave-loss quotient plus one preset minimum heating unit, and loop for the number of cycles of the smallest non-zero wave-loss remainder; and / or, S420B. Select a single coil with the smallest second wave-loss ratio, control the coil to work with the corresponding wave-loss quotient of preset minimum heating units, and control the coils with wave-loss quotients greater than the minimum wave-loss quotient to work with the corresponding wave-loss quotient plus one preset minimum heating unit, and loop for the number of cycles equal to the difference between the other non-zero wave-loss remainders and the smallest non-zero wave-loss remainder; S430B. Control all coils to work with their respective corresponding wave-loss quotient of preset minimum heating units, and loop for a preset number of cycles; wherein, the sum of the number of preset minimum heating units included in the number of cycles of the smallest non-zero wave-loss remainder, the number of cycles of the difference, and the preset number of cycles is equal to the total number of preset minimum heating units in the preset pulse width modulation cycle.

[0053] In this embodiment, step S400 can also control the multi-wire coils 4 in the time-sharing mode through three steps to ensure that each wire coil 4 operates efficiently and collaboratively according to its allocated working power. First, in step S410B, first select a single wire coil 4 with the smallest second wave loss ratio as the priority adjustment object, and control this wire coil 4 to work with the preset minimum heating units corresponding to the number of wave loss quotients; at the same time, for all the other wire coils 4 with non-zero wave loss quotients, an additional preset minimum heating unit is added to work on the basis of their respective wave loss quotients, and the cycle number corresponding to the "minimum non-zero wave loss remainder" is executed in a loop. In addition, alternatively, step S420B can be adopted to further refine the control: still select the wire coil 4 with the smallest second wave loss ratio, set the number of working units based on its wave loss quotient, and for the other wire coils 4 with wave loss quotients greater than this minimum value, an additional preset minimum heating unit is also added to work on the basis of their wave loss quotients, and the cycle number of the "difference between the other non-zero wave loss remainders and the minimum non-zero wave loss remainder" is executed in a loop, so as to more accurately compensate for the energy differences between different wire coils 4. Finally, in step S430B, all wire coils 4 uniformly work with the preset minimum heating unit quantities set according to their respective wave loss quotients, and a preset number of cycles are executed in a loop. The total number of preset minimum heating units included in the "minimum non-zero wave loss remainder cycle number", "difference cycle number", and "preset cycle number" involved in the above three-step operations is strictly equal to the total number of preset minimum heating units within the entire preset pulse width modulation cycle. Through the synergistic effect of these three steps, not only can the power distribution control between the multi-wire coils 4 be achieved, but also the heating efficiency and the uniformity and stability of the heat energy distribution can be improved, thereby enhancing the overall performance of the electromagnetic heating device 100 and the user experience.

[0054] To more intuitively illustrate the application of the above steps, the following explanations are made in combination with the above two examples: In the first example, the second wave loss ratio of the No. 1 wire coil 4 is 11, and the second wave loss ratio of the No. 2 wire coil 4 is 39. Therefore, the smallest second wave loss ratio corresponds to the No. 1 wire coil 4. Since the wave loss remainder of the No. 2 wire coil 4 is 6, it indicates that 6 additional preset minimum heating units are required to compensate for this remainder. As Figure 7As shown, the electromagnetic heating device 100 first controls the first coil 4 to operate with 1 preset minimum heating unit, and at the same time controls the second coil 4 to operate with 3 + 1 = 4 preset minimum heating units, and cycles for 6 periods. Among them, each preset minimum heating unit is 10 ms. In each period, the first coil 4 operates for 10 ms, and the second coil 4 operates for 40 ms. In each period, the two coils 4 consume a total of 1 + 4 = 5 heating units. In 6 periods, a total of 5 × 6 = 30 heating units are consumed. It is known that the entire PWM period contains 50 heating units (that is, the preset pulse width modulation period is 50, and each preset minimum heating unit is 1), so there are still 20 heating units unused in the first 6 periods. Next, the electromagnetic heating device 100 continues to control the first coil 4 to operate with 1 heating unit and the second coil 4 to operate with 3 heating units, and cycles for 5 periods. In each period, the first coil 4 operates for 10 ms, and the second coil operates for 30 ms. In each period, the two coils 4 consume a total of 1 + 3 = 4 heating units. In 5 periods, a total of 20 heating units are consumed. Thus, the energy distribution within the entire PWM period is completed.

[0055] In the second example, the second wave loss ratio of the third coil 4 is 8, that of the fourth coil 4 is 12, and that of the fifth coil 4 is 30. Therefore, the smallest second wave loss ratio corresponds to the third coil 4. Since the wave loss remainder of the fourth coil 4 is 4 and that of the fifth coil 4 is 6, it indicates that they respectively need to add 4 and 6 preset minimum heating units for compensation. As Figure 8 shown, the electromagnetic heating device 100 first controls the third coil 4 to operate with 1 heating unit, the fourth coil 4 to operate with 1 + 1 = 2 heating units, and the fifth coil 4 to operate with 3 + 1 = 4 heating units, and cycles for 4 periods; each period consumes a total of 1 + 2 + 4 = 7 heating units, and 4 periods consume a total of 28 heating units. The entire PWM period contains 50 heating units, so there are still 22 unused. Considering that the fifth coil 4 needs to compensate 6 remainders, and currently only 4 compensations are completed (1 compensation per period), 2 additional compensations are still required. Then, the device continues to control the third coil 4, the fourth coil 4, and the fifth coil 4 to operate with 1, 1, and 4 heating units respectively, and cycles for 2 periods. Each period consumes 6 heating units, and the cumulative consumption is 12. At this time, there are still 10 heating units unused. Finally, the device controls the three to operate with 1, 1, and 3 heating units respectively, and cycles 2 times. Each time it consumes 5 heating units, for a total of 10, thus completing the energy distribution of the entire PWM period.

[0056] The present invention also proposes a control device 1 for the electromagnetic heating device 100. Please refer to Figure 9, the control device 1 of the electromagnetic heating device 100 includes a memory 11 and a processor 12. The memory 11 is used to store the control program of the electromagnetic heating device 100, and the processor 12 is used to execute the control program of the electromagnetic heating device 100 to implement the control method of the electromagnetic heating device 100 as described above. For the specific structure of the control method of the electromagnetic heating device 100, refer to the above embodiments. Since the control device 1 of this electromagnetic heating device 100 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0057] The present invention also proposes an electromagnetic heating device 100. Please refer to Figure 10 , the electromagnetic heating device 100 includes a panel 3, a rectifier filter circuit 2, a switching device 5, a coil disk 4, and a control device 1 of the electromagnetic heating device 100. For the specific structure of the control device 1 of the electromagnetic heating device 100, refer to the above embodiments. Since this electromagnetic heating device 100 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, the electromagnetic heating device 100 can be an induction cooker, a cooking device, a stir-fry robot, etc., and is not specifically limited. The electromagnetic heating device 100 can include, but is not limited to, a rectifier filter circuit 2, a switching device 5, a coil disk 4, and a control device 1. The panel 3 can be a touch control panel 3, which is used to place cookware and also serves as the main operation interface for users to interact with the electromagnetic heating device 100; the rectifier filter circuit 2 can be composed of a full-wave rectifier, a half-wave rectifier, and a filter, and is used to convert the externally input alternating current into direct current and remove the fluctuation components in the current to provide stable direct current; the switching device 5 can include one or a combination of an insulated gate bipolar transistor (IGBT), a metal oxide semiconductor field effect transistor (MOSFET), and a thyristor (THYRISTOR), and is used to convert the direct current output by the rectifier filter circuit 2 into high-frequency alternating current; the coil disk 4 can include one or a combination of a single-layer spiral coil and a multi-layer spiral coil, and is used to generate a high-frequency alternating magnetic field when high-frequency alternating current passes through.

[0058] To further improve the heating efficiency and uniformity and enhance the flexibility of use, multiple wire coils 4 are provided in this embodiment. The multiple wire coils 4 can simultaneously heat different areas of the bottom of the pot, thereby accelerating the heating rate and shortening the cooking time. Compared with a single wire coil 4, the multiple wire coils 4 can effectively improve the problem of uneven heat distribution at the bottom of the pot. Especially when using a larger pot, it is more conducive to the uniform distribution of heat and avoids the situation of food burning or insufficient heating. In addition, for pots of different sizes, the electromagnetic heating device 100 with multiple wire coils 4 can automatically select a suitable combination of wire coils 4 to work according to the size of the pot, and even supports the simultaneous use of multiple pots of different sizes without interference.

[0059] It should be noted that some existing electromagnetic heating devices 100 (such as some induction cookers) have also adopted multiple wire coils 4 to achieve "zone-free heating". "Zone-free heating" refers to a heating method in which, when the pot covers multiple wire coils 4, no explicit zone control is performed, making the overall heating of the pot more uniform. However, there are still several technical bottlenecks in the zone-free heating control of the current electromagnetic heating device 100: First, the control strategy is complex, and factors such as power distribution between each wire coil 4 and heating time coordination need to be comprehensively considered, making the design and implementation difficult; Second, due to the high control complexity, it is difficult to fully utilize the maximum heating capacity of each wire coil 4, resulting in an increase in heating time and energy consumption and affecting the overall efficiency; Third, problems such as unstable working states of the wire coils 4 or electromagnetic interference may occur during the heating process, which may further cause abnormal noise and reduce the user experience. Thus, although the multi-wire coil 4 structure has significant advantages in improving the heating performance, how to achieve efficient, stable and intelligent control remains a key problem that needs to be solved urgently.

[0060] In response to the above challenges, the control device 1 of this embodiment can obtain the target power and the preset pulse width modulation period of the electromagnetic heating device 100. First, it distributes the working power required for each wire coil 4 according to the target power, so as to achieve a reasonable distribution of the target power. Then, it calculates the wave loss parameters of each wire coil 4 according to the obtained pulse width modulation period, and controls the multiple wire coils 4 according to the calculated wave loss parameters, so that the output power of each wire coil 4 reaches the corresponding working power. Through this control method, not only can the efficiency of the multi-wire coil 4 working together be improved, energy waste be avoided, but also the stability and controllability during the heating process of the multi-wire coil 4 can be enhanced, reducing abnormal sound problems caused by power fluctuations or electromagnetic interference, thereby improving the user experience and enhancing the overall performance of the electromagnetic heating device 100.

[0061] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A control method for an electromagnetic heating device, characterized in that, The electromagnetic heating device includes a plurality of wire coils, and the control method of the electromagnetic heating device includes: Obtaining the target power and the preset pulse width modulation period of the electromagnetic heating device; Determining the operating power of each of the wire coils according to the target power; Calculating the wave loss parameters of each of the wire coils according to the preset pulse width modulation period; Controlling each of the wire coils to operate according to the calculated wave loss parameters, so that the output power of each of the wire coils reaches the corresponding operating power.

2. The control method of the electromagnetic heating device according to claim 1, wherein The step of obtaining the target power and the preset pulse width modulation period of the electromagnetic heating device further includes: Obtaining the state of the current cookware; The step of calculating the wave loss parameters of each of the wire coils according to the preset pulse width modulation period specifically includes: Determining the operating mode of the electromagnetic heating device according to the state of the cookware and the operating power, the operating mode including a same-frequency mode and a time-sharing mode. In the same-frequency mode, the operating power of each of the wire coils is the same. In the time-sharing mode, the operating powers of at least two of the wire coils are different; Calculating the wave loss parameters of each of the wire coils corresponding to the determined operating mode according to the preset pulse width modulation period.

3. The control method of the electromagnetic heating device according to claim 2, characterized in that, The step of calculating the wave loss parameters of each of the wire coils corresponding to the determined operating mode according to the preset pulse width modulation period specifically includes: When determining that the operating mode of the electromagnetic heating device is the same-frequency mode, obtaining the current moving power of the electromagnetic heating device and the current average output power of the electromagnetic heating device; Calculating the first wave loss parameters of each of the wire coils according to the preset pulse width modulation period, the current moving power and the current average output power.

4. The control method of the electromagnetic heating device according to claim 3, characterized in that, The first wave loss parameter is the first wave loss duty cycle; The corresponding relationship between the first wave loss duty cycle and the current average output power is: The current average output power = the current moving power × the first wave loss duty cycle / the preset pulse width modulation period.

5. The control method of the electromagnetic heating device according to claim 3, characterized in that, The step of controlling each of the wire coils to operate according to the calculated wave loss parameters, so that the output power of each of the wire coils reaches the corresponding operating power specifically includes: Adjusting the operating frequency of the wire coil so that the current average output power of the electromagnetic heating device reaches the operating power of the wire coil; When determining that the operating frequency of the wire coil reaches the preset frequency and the current average output power of the electromagnetic heating device does not reach the operating power of the wire coil, adjusting the first wave loss parameter of the wire coil until the current average output power of the electromagnetic heating device reaches the operating power of the wire coil.

6. The control method of the electromagnetic heating device according to claim 2, characterized in that, The step of calculating the wave loss parameters of each of the wire coils corresponding to the determined operating mode according to the preset pulse width modulation period specifically includes: When determining that the operating mode of the electromagnetic heating device is the time-sharing mode, obtaining the preset minimum heating unit and the number of wire coils; Calculating the second wave loss parameters of each of the wire coils according to the preset pulse width modulation period, the preset minimum heating unit, the number of wire coils and the operating power of each of the wire coils.

7. The control method of the electromagnetic heating device according to claim 6, characterized in that, The second wave loss parameters include a second wave loss duty cycle, a wave loss quotient and a wave loss remainder; The calculation formula of the second wave loss duty cycle is: The second wave-loss duty ratio = preset minimum heating unit + operating power of a single coil × (preset pulse width modulation period - number of coils × preset minimum heating unit) / the target power; The calculation formula for the wave-loss quotient is: The wave-loss quotient = second wave-loss duty ratio of a single coil / minimum second wave-loss duty ratio among multiple coils; The calculation formula for the wave-loss remainder is: The wave-loss remainder = second wave-loss duty ratio of a single coil % minimum second wave-loss duty ratio among multiple coils.

8. The control method of the electromagnetic heating device according to claim 7, characterized in that, The step of controlling each of the coils to operate so that the output power of each coil reaches the corresponding operating power according to the calculated wave-loss parameters specifically includes: Select a single coil with the smallest second wave-loss ratio, control the coil to operate with the corresponding wave-loss quotient of preset minimum heating units, and control all coils with non-zero wave-loss quotients to operate with one preset minimum heating unit added to the corresponding wave-loss quotient, and loop for the number of cycles of the minimum non-zero wave-loss remainder; And / or, select a single coil with the smallest second wave-loss ratio, control the coil to operate with the corresponding wave-loss quotient of preset minimum heating units, and control the coils with wave-loss quotients greater than the minimum wave-loss quotient to operate with one preset minimum heating unit added to the corresponding wave-loss quotient, and loop for the number of cycles equal to the difference between the other non-zero wave-loss remainder and the minimum non-zero wave-loss remainder; Control all coils to operate with the corresponding wave-loss quotient of preset minimum heating units, and loop for a preset number of cycles; Wherein, the sum of the number of preset minimum heating units included in the number of cycles of the minimum non-zero wave-loss remainder, the number of cycles of the difference, and the preset number of cycles is equal to the total number of preset minimum heating units in the preset pulse width modulation period.

9. A control device for an electromagnetic heating device, characterized in that, Comprising: A memory; A processor, a control program for an electromagnetic heating device stored on the memory and executed by the processor, the control program for the electromagnetic heating device, when executed by the processor, implements the control method of the electromagnetic heating device according to any one of claims 1 to 8.

10. An electromagnetic heating device, characterized in that, Comprising the control device of the electromagnetic heating device according to claim 9.

Images