Control methods, devices, and electromagnetic heating equipment

Abstract

This invention discloses a control method, apparatus, and electromagnetic heating device for an electromagnetic heating equipment, relating to the technical field of electromagnetic heating equipment. The electromagnetic heating equipment includes multiple coils, and the control method includes: acquiring the target power and a preset pulse width modulation period of the electromagnetic heating equipment; determining the operating power of each coil based on the target power; calculating the dropout parameters of each coil based on the preset pulse width modulation period; and controlling the operation of each coil based on the calculated dropout parameters to ensure that the output power of each coil reaches the corresponding operating power. The technical solution provided by this invention can solve the problems of low heating efficiency and abnormal noise caused by the complex coordination of coil power distribution and heating time in zoneless heating control of existing induction cookers.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic heating equipment technology, and in particular to a control method, device, and electromagnetic heating equipment for electromagnetic heating equipment. Background Technology

[0002] With the continuous development of electromagnetic technology, household induction cookers are becoming increasingly popular. Users expect cookware to heat automatically regardless of its size, regardless of where it is placed. However, current induction cookers, when controlling multiple coils for zoneless heating, may need to consider many factors, such as power distribution among different coils and coordination of heating times. This complexity leads to a relatively complex control strategy design and implementation. Furthermore, due to this complexity, the heating capacity of the coils may not be fully utilized, resulting in more time and energy wasted and inefficiency. During zoneless heating, unstable coil operation and electromagnetic interference may cause abnormal noises from the induction cooker, affecting the user experience. Summary of the Invention

[0003] The main objective of this invention is to propose a control method, device, and electromagnetic heating equipment for electromagnetic heating devices, aiming to solve the problems of low heating efficiency and abnormal noise caused by the complex coordination of coil power distribution and heating time in zoneless heating control of existing induction cookers.

[0004] To achieve the above objectives, the present invention proposes a control method for an electromagnetic heating device, wherein the electromagnetic heating device includes multiple coils, and the control method for the electromagnetic heating device includes:

[0005] Obtain the target power and preset pulse width modulation period of the electromagnetic heating equipment;

[0006] The operating power of each coil is determined based on the target power.

[0007] Calculate the dropout parameters of each of the coils according to the preset pulse width modulation period;

[0008] Based on the calculated wave drop parameters, the operation of each coil is controlled so that the output power of each coil reaches the corresponding operating power.

[0009] In one embodiment, the step of obtaining the target power and preset pulse width modulation period of the electromagnetic heating device further includes:

[0010] Get the current status of the cookware;

[0011] The step of calculating the loss parameters of each coil according to the preset pulse width modulation period specifically includes:

[0012] The working mode of the electromagnetic heating device is determined 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 power of each coil is the same. In the time-sharing mode, at least two coils have different working power.

[0013] Based on the preset pulse width modulation period, the loss parameters of each coil corresponding to the determined working mode are calculated.

[0014] In one embodiment, the step of calculating the loss parameters of each coil corresponding to the determined operating mode based on the preset pulse width modulation period specifically includes:

[0015] When the working mode of the electromagnetic heating device is determined to be the same frequency mode, the current moving power and the current average output power of the electromagnetic heating device are obtained.

[0016] The first loss parameter of each coil is calculated based on the preset pulse width modulation period, the current moving power, and the current average output power.

[0017] In one embodiment, the first dropout parameter is the first dropout duty cycle;

[0018] The relationship between the first loss duty cycle and the current average output power is as follows:

[0019] The current average output power = the current mobile power × the first dropout duty cycle / preset pulse width modulation period.

[0020] In one embodiment, the step of controlling the operation of each coil according to the calculated loss parameters so that the output power of each coil reaches the corresponding operating power specifically includes:

[0021] Adjust the operating frequency of the coil so that the current average output power of the electromagnetic heating device reaches the operating power of the coil.

[0022] When it is determined that the operating frequency of the coil has reached the preset frequency and the current average output power of the electromagnetic heating device has not reached the operating power of the coil, the first loss parameter of the coil is adjusted until the current average output power of the electromagnetic heating device reaches the operating power of the coil.

[0023] In one embodiment, the step of calculating the loss parameters of each coil corresponding to the determined operating mode based on the preset pulse width modulation period specifically includes:

[0024] When the working mode of the electromagnetic heating device is determined to be time-sharing mode, the preset minimum number of heating units and coils is obtained.

[0025] The second loss parameter of each coil is calculated based on the preset pulse width modulation period, the preset minimum heating unit, the number of coils, and the operating power of each coil.

[0026] In one embodiment, the second loss parameter includes a second loss duty cycle, a loss quotient, and a loss remainder;

[0027] The formula for calculating the second loss duty cycle is:

[0028] The second dropout duty cycle = preset minimum heating unit + working power of a single coil × (preset pulse width modulation period - number of coils × preset minimum heating unit) / target power;

[0029] The formula for calculating the wavelet loss quotient is:

[0030] The dropout quotient = the second dropout duty cycle of a single coil / the smallest second dropout duty cycle among multiple coils;

[0031] The formula for calculating the lost wave residue is:

[0032] The dropout duty cycle is defined as the second dropout duty cycle of a single coil % of the minimum second dropout duty cycle among multiple coils.

[0033] In one embodiment, the step of controlling the operation of each coil according to the calculated loss parameters so that the output power of each coil reaches the corresponding operating power specifically includes:

[0034] Select the single coil with the smallest second wave loss ratio, control the coil to work with the corresponding wave loss quotient and the preset minimum heating unit, 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 cyclically execute the minimum wave loss quotient cycle;

[0035] And / or, select the single coil with the smallest second wave drop ratio, control the coil to work with a preset minimum heating unit corresponding to the wave drop ratio, and control the coil with a wave drop ratio greater than the minimum wave drop ratio to work with a preset minimum heating unit according to the corresponding wave drop ratio, and cyclically execute the difference between other non-zero wave drop ratios and the minimum non-zero wave drop ratio for a number of cycles.

[0036] Control all coils to work at their respective corresponding preset minimum heating units, and execute the preset number of cycles.

[0037] Wherein, the sum of the minimum non-zero loss remainder cycles, the difference cycles, and the preset cycles contains the preset minimum heating unit number, which is equal to the total preset minimum heating unit number in the preset pulse width modulation cycle.

[0038] The present invention also proposes a control device for an electromagnetic heating device, comprising:

[0039] Memory;

[0040] The processor contains a control program for the electromagnetic heating device stored in the memory and executed by the processor. When executed by the processor, the control program for the electromagnetic heating device implements the control method for the electromagnetic heating device as described above.

[0041] The present invention also proposes an electromagnetic heating device, including a control device for the electromagnetic heating device as described above.

[0042] The technical solution of this invention obtains the target power of the electromagnetic heating device and a preset pulse width modulation period. First, it allocates the required operating power for each coil according to the target power, thus achieving a reasonable distribution of the target power. Then, it calculates the dropout parameters of each coil based on the obtained pulse width modulation period and controls the multiple coils according to the calculated dropout parameters, ensuring that the output power of each coil reaches its corresponding operating power. This control method not only improves the efficiency of multi-coil collaborative work and avoids energy waste, but also enhances the stability and controllability of the multi-coil heating process, reduces abnormal noise problems caused by power fluctuations or electromagnetic interference, thereby improving the user experience and enhancing the overall performance of the electromagnetic heating device. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0044] Figure 1 A flowchart of the first embodiment of the control method for the electromagnetic heating device provided by the present invention;

[0045] Figure 2 A flowchart of the second embodiment of the control method for the electromagnetic heating device provided by the present invention;

[0046] Figure 3 A flowchart of the third embodiment of the control method for the electromagnetic heating device provided by the present invention;

[0047] Figure 4 A flowchart of the fourth embodiment of the control method for the electromagnetic heating device provided by the present invention;

[0048] Figure 5 A flowchart of the fifth embodiment of the control method for the electromagnetic heating device provided by the present invention;

[0049] Figure 6 A flowchart of the sixth embodiment of the control method for the electromagnetic heating device provided by the present invention;

[0050] Figure 7 for Figure 6 Timing diagram of line reel 1 and line reel 2 in the embodiment;

[0051] Figure 8 for Figure 6 The working timing diagram of reel 3, reel 4 and reel 5 in the embodiment;

[0052] Figure 9 A schematic diagram of the circuit functional modules of an embodiment of the control device provided by the present invention;

[0053] Figure 10 This is a schematic diagram of the circuit functional modules of an embodiment of the electromagnetic heating device provided by the present invention.

[0054] Explanation of icon numbers:

[0055] 100. Electromagnetic heating equipment; 1. Control device; 11. Memory; 12. Processor; 2. Rectifier and filter circuit; 3. Panel; 4. Coil; 5. Switching device.

[0056] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0058] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0059] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0060] With the continuous development of electromagnetic technology, household induction cookers are becoming increasingly popular. Users expect cookware to heat automatically regardless of its size, regardless of where it is placed. However, current induction cookers, when controlling multiple coils for zoneless heating, may need to consider many factors, such as power distribution among different coils and coordination of heating times. This complexity leads to a relatively complex control strategy design and implementation. Furthermore, due to this complexity, the heating capacity of the coils may not be fully utilized, resulting in more time and energy wasted and inefficiency. During zoneless heating, unstable coil operation and electromagnetic interference may cause abnormal noises from the induction cooker, affecting the user experience.

[0061] To address the above problems, this invention proposes a control method for an electromagnetic heating device 100.

[0062] Please see Figure 1 and Figure 10 In one embodiment of the present invention, the electromagnetic heating device 100 includes a plurality of coils 4, and the control method of the electromagnetic heating device 100 includes:

[0063] S100A: Obtain the target power and preset pulse width modulation period of the electromagnetic heating equipment;

[0064] S200. Determine the operating power of each coil based on the target power.

[0065] S300: Calculate the loss parameters of each coil according to the preset pulse width modulation period;

[0066] S400: Based on the calculated loss parameters, control the operation of each coil to ensure that the output power of each coil reaches the corresponding operating power.

[0067] In this embodiment, the electromagnetic heating device 100 can be an induction cooker, a steaming or cooking device, or a cooking robot, etc., and is not specifically limited. The electromagnetic heating device 100 may include a panel 3, a rectifier and filter circuit 2, a switching device 5, a coil 4, etc. For ease of explanation, the following uses an electromagnetic heating device 100, including a panel 3, a rectifier and filter circuit 2, a switching device 5, and a coil 4, as an example to elaborate on its hardware structure and working principle: The panel 3 can be a touch control panel 3, used both to place cookware and as the main operating interface for users to interact with the electromagnetic heating device 100; the rectifier and filter circuit 2 can be composed of a full-wave rectifier, a half-wave rectifier, and a filter, used to convert externally input AC power into DC power and remove the fluctuating components in the current to provide stable DC power; the switching device 5 can include one or more combinations of insulated-gate bipolar transistors (IGBTs), metal-oxide-semiconductor field-effect transistors (MOSFETs), and silicon controlled rectifiers (SCRs), used to convert the DC power output from the rectifier and filter circuit 2 into high-frequency AC power; the coil 4 can include one or more combinations of single-layer spiral coils and multi-layer spiral coils, used to generate a high-frequency alternating magnetic field when high-frequency AC power passes through.

[0068] In actual operation, the electromagnetic heating device 100 operates as follows: The external AC power is first converted to DC power by a rectifier circuit, and then filtered by a capacitor to form a DC voltage higher than the original AC voltage peak (approximately 310V for 220V AC mains power), also known as the DC bus voltage. Subsequently, this DC voltage is converted to a high-frequency AC voltage by a switching device 5. The high-frequency current passing through the coil 4 generates a high-frequency alternating magnetic field. When a ferromagnetic pot is placed on the panel 3, under the influence of the high-frequency alternating magnetic field, the bottom of the pot cuts the magnetic lines of force, generating an induced current. According to the eddy current effect, this current is converted into heat energy at the bottom of the pot, thus heating the food.

[0069] To further improve heating efficiency and uniformity, and enhance usability, this embodiment provides multiple coils 4. Multiple coils 4 can simultaneously heat different areas of the pot bottom, thereby accelerating the heating rate and shortening cooking time. Compared to a single coil 4, multiple coils 4 effectively improve the problem of uneven heating of the pot bottom, especially when using larger pots, as they promote more even heat distribution and prevent food from burning or underheating. Furthermore, for pots of different sizes, the electromagnetic heating device 100 with multiple coils 4 can automatically select the appropriate coil combination based on the pot size, and even support the simultaneous use of multiple pots of different sizes without interference.

[0070] It is worth noting that some existing electromagnetic heating devices 100 (such as some induction cookers) have also adopted multiple coils 4 to achieve "zoneless heating." "Zoneless heating" refers to a heating method where the cookware is covered by multiple coils 4 without explicit zone control, resulting in more uniform heating of the entire cookware. However, the zoneless heating control of current electromagnetic heating devices 100 still faces several technical bottlenecks: First, the control strategy is complex, requiring comprehensive consideration of factors such as power distribution and heating time coordination among the coils 4, making design and implementation difficult; second, due to the high control complexity, it is difficult to fully utilize the maximum heating capacity of each coil 4, leading to increased heating time and energy consumption, affecting overall efficiency; third, during the heating process, problems such as unstable working status of the coils 4 or electromagnetic interference may occur, leading to abnormal noise and reduced user experience. Therefore, although the multi-coil 4 structure has significant advantages in improving heating performance, how to achieve efficient, stable, and intelligent control remains a key issue that urgently needs to be addressed.

[0071] To address this challenge, the present invention proposes a control method for an 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 time of the coil 4 in the zoneless heating control of existing induction cookers.

[0072] In this embodiment, the control method of the electromagnetic heating device 100 mainly includes the following three steps:

[0073] First, in step S100A, the electromagnetic heating device 100 acquires its target power and preset pulse width modulation (PWM) period, which provides basic data for subsequent power distribution and control. The target power is the heating power set by the user or determined by the electromagnetic heating device 100 based on cooking needs. Pulse width modulation (PWM) is a technique that modulates the width of a series of pulses to equivalently obtain the desired waveform (including shape and amplitude). The preset PWM period is the time length of a complete cycle of the pre-set PWM signal, which determines the basic frequency of the modulated signal. Next, in step S200, the electromagnetic heating device 100 determines the operating power that each coil 4 should bear based on the acquired target power, thereby achieving reasonable power distribution. For example, when the electromagnetic heating device 100 detects that the pot on the panel 3 is large, multiple coils 4 may need to work simultaneously to provide sufficient heating capacity. Assuming the target power is 100W, and the electromagnetic heating device 100 is configured with two coils 4, the power can be evenly distributed to each coil at 50W, or non-uniformly distributed as needed, such as 60W and 40W. If the cookware is small, only some of the coils 4 can be operated, depending on the actual situation. For example, when the electromagnetic heating device 100 is equipped with three coils 4 and the target power is still 100W, two of the coils 4 can be selected to operate. These two coils 4 can operate simultaneously or sequentially at certain time intervals, and their respective power allocations can be the same or different. This power allocation method not only improves the adaptability of the electromagnetic heating device 100 but also avoids energy waste.

[0074] Finally, in steps S300 and S400, the electromagnetic heating device 100 calculates the required dropout parameters for each coil 4 based on a preset pulse width modulation (PWM) cycle, and controls each coil 4 according to these calculation results to ensure that each coil 4 can output the actual power corresponding to its allocated working power. To achieve this goal, the dropout parameters of each coil 4 must be calculated based on the preset PWM cycle. This is because, in the process of multiple coils 4 working together, to achieve precise power control and time coordination, the on / off state of each coil 4 must be adjusted. The dropout parameter refers to the number of times a coil 4 is skipped or "discarded" from being turned on within a complete PWM cycle. In other words, it reflects the number of time periods during which the coil 4 is not activated within a cycle, thereby indirectly determining the proportion of its actual working time and the magnitude of its output power. Specifically, a PWM cycle can consist of several preset minimum heating units, each of which can be a half-wave or other set basic time unit. For example, assuming a PWM cycle contains 50 preset minimum heating units, the actual on-time of the coil 4 within that cycle can be controlled by adjusting how many units are "skipped" or not operated, 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.

[0075] To more clearly illustrate the role of the dropout parameter and its control method, two typical scenarios can be used as examples: When a large pot is placed on the panel 3 of the electromagnetic heating device 100, multiple coils 4 may need to work simultaneously to provide sufficient heating capacity. For example, if the electromagnetic heating device 100 is configured with two coils 4, and if it detects that the pot has covered both coils 4, and the electromagnetic heating device 100 determines that a higher target power is required, it will allocate a relatively higher operating power to these two coils 4. In this case, the electromagnetic heating device 100 can set the dropout parameter of the two coils 4 to a smaller value, that is, reduce the minimum number of heating units that are skipped by each coil 4 in one PWM cycle, thereby allowing the two coils 4 to be in working state for a longer period of time, increasing their respective output power, and thus increasing the overall average output power of the coils 4, meeting the need for rapid and uniform heating of large pots. Conversely, when a small pot is placed on the panel 3, to avoid local overheating or energy waste, only some coils 4 may need to work, or even if multiple coils 4 work simultaneously, the output power of some coils 4 may need to be reduced. Taking two coils 4 as an example, if the cookware only covers one coil 4 and the other coil 4 only plays an auxiliary role, the electromagnetic heating device 100 can allocate a higher operating power to the covered coil 4 and a lower operating power to the auxiliary coil 4. In this case, the electromagnetic heating device 100 can reduce the number of minimum heating units skipped in one PWM cycle for the covered coil 4, keeping it in a working state for a longer period, thus achieving its allocated operating power. Simultaneously, by increasing the dropout parameter of the auxiliary coil 4, i.e., increasing the number of minimum heating units skipped in one PWM cycle, it keeps it in a non-working state for a longer period, thereby reducing its output power and also achieving its allocated operating power. In other words, in these two scenarios, by adjusting the dropout parameter of the two coils 4 under different cookware conditions, the output power of each coil 4 can be fine-tuned and matched while maintaining the overall operational stability of the electromagnetic heating device 100, thereby optimizing the power balance among the multiple coils 4 and the coordination of the heating process.

[0076] The technical solution of this invention provides basic parameters for subsequent control by acquiring the target power and preset the pulse width modulation (PWM) period. Then, it rationally allocates the working power of each coil 4 according to the target power to adapt to the heating needs of cookware of different sizes. Finally, it calculates the dropout parameters of each coil 4 based on the PWM period and controls it according to the calculated dropout parameters to ensure that the output power of each coil 4 matches its allocated working power. This control method not only achieves efficient coordination and power balance among multiple coils 4, but also improves the overall heating speed and energy efficiency of the electromagnetic heating device 100, reduces energy waste, and reduces abnormal noise caused by coil 4 instability or electromagnetic interference, thus optimizing the user experience. In summary, this control method can systematically solve the key technical problems in zoneless heating from three levels: power allocation, time coordination, and dynamic adjustment, providing a practical technical solution for achieving intelligent, high-efficiency, and low-noise electromagnetic heating.

[0077] Please see Figure 2 In one embodiment, step S100A further includes:

[0078] S100B: Obtain the current status of the cookware;

[0079] Step S300 specifically includes:

[0080] S310. Determine the working mode of the electromagnetic heating equipment according to the state of the cookware and the working power. The working modes include 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, at least two coils have different working power.

[0081] S320. Calculate the loss parameters of each coil corresponding to the preset pulse width modulation period and the determined working mode.

[0082] In this embodiment, the electromagnetic heating device 100 first acquires the target power and preset pulse width modulation (PWM) period in step S100A, providing basic data for subsequent power distribution and control. Furthermore, in step S100B, it further acquires the current state of the cookware, including its size, placement position, and the coil 4 it covers. Acquiring this information allows the electromagnetic heating device 100 to adjust the heating process according to the actual usage of the cookware, thus more accurately adapting to heating requirements.

[0083] Based on this, proceed to step S300, which mainly includes the following two steps:

[0084] First, in step S310, a suitable operating mode is selected based on the state of the cookware and the previously determined operating power. The operating mode can include a synchronous mode and a time-sharing mode. The synchronous mode is suitable for scenarios where the cookware covers multiple coils 4 and requires uniform heating. In synchronous mode, all coils 4 participating in the heating will operate at the same power. For example, if the target power is 100W and the electromagnetic heating device 100 is configured with two coils 4, both coils 4 can operate at 50W. The time-sharing mode is suitable for situations where the cookware is small or only covers part of the coils 4. In time-sharing mode, at least two coils 4 operate at different power, thus achieving more flexible power distribution. For example, with the same target power of 100W, if the electromagnetic heating device 100 is also configured with two coils 4, one coil 4 can operate at 40W, while the other operates at 60W; or, one coil 4 can operate at 30W, and the other at 70W. For example, when the target power is still 100W but the electromagnetic heating device 100 is equipped with three coils 4, two of the coils 4 can operate at 20W each, while the other coil 4 operates at 60W. In this way, step S310 can determine the optimal operating mode according to the specific condition of the pot and the required heating power, effectively improving heating efficiency and thermal energy utilization, while avoiding energy waste and local overheating problems.

[0085] Then, in step S320, the electromagnetic heating device 100 calculates the waveform loss parameters of each coil 4 corresponding to the selected operating mode based on a preset pulse width modulation cycle. Specifically, in the same-frequency mode, since all coils 4 have the same operating power, their waveform loss parameters are also the same. This not only simplifies the calculation process of the waveform loss parameters of the coils 4, but also helps to achieve synchronization and consistency among the coils 4. Furthermore, in the same-frequency mode, all coils 4 start at the same time and maintain the same turn-on and turn-off rhythm, that is, the turn-on duration of all coils 4 is consistent within one PWM cycle, thereby ensuring the uniformity and stability of heating. In the time-sharing mode, considering that at least two coils 4 are allocated different operating power, that is, at least two coils 4 will have different waveform loss parameters, the electromagnetic heating device 100 will calculate the waveform loss parameters of each coil 4 separately. For coil 4, which requires higher power output, its waveform dropping parameter is set to be smaller, that is, the number of minimum heating units that are skipped is reduced, allowing it to remain on for a longer period within a PWM cycle, thereby increasing its output power. Conversely, for coil 4, which requires lower power output, the number of waveform dropping events is increased, extending its non-operating time and thus reducing its output power. Furthermore, in time-sharing mode, multiple coils 4 are started sequentially or operate in staggered shifts to coordinate their working rhythms and avoid power conflicts or electromagnetic interference caused by time overlap.

[0086] Through the synergistic effect of the above steps, this embodiment enables refined and intelligent management of the electromagnetic heating device 100. On the one hand, the electromagnetic heating device 100 determines a suitable operating mode based on the pot status and the operating power allocated to each coil 4, and calculates the loss parameters corresponding to the operating mode based on a preset pulse width modulation (PWM) cycle. Then, by adjusting the loss parameters, it controls the actual output power of each coil 4 to accurately match the corresponding operating power, thereby improving the adaptability of the electromagnetic heating device 100 to different pot sizes and heating requirements. On the other hand, during the collaborative operation of multiple coils 4, the start-up and stop times of each coil 4 are rationally arranged, effectively avoiding electromagnetic interference and power fluctuations caused by the simultaneous operation of multiple coils 4, thereby reducing the probability of abnormal noise and further optimizing the stability of the heating process and the user experience.

[0087] Please see Figure 3 In one embodiment, step S320 specifically includes:

[0088] S321A. When the working mode of the electromagnetic heating device is determined to be the same frequency mode, the current moving power and the current average output power of the electromagnetic heating device are obtained.

[0089] S322A calculates the first loss parameters of each coil based on the preset pulse width modulation period, the current moving power, and the current average output power.

[0090] In this embodiment, when the working mode of the electromagnetic heating device 100 is determined to be the same-frequency mode, in order to achieve unified power control and coordinated operation of multiple coils 4, step S200 can be refined into two key sub-steps to complete the power allocation and calculation process of the first loss parameter. First, in step S210A, the electromagnetic heating device 100 obtains the current moving power and average output power. The moving power refers to the total power currently actually output by the electromagnetic heating device 100, reflecting the current heating capacity or load status of the device; while the average output power refers to the average power currently actually output by the electromagnetic heating device 100, reflecting the stability and continuity of the overall heating process. Next, in step S220A, the electromagnetic heating device 100 calculates the first loss parameter corresponding to each coil 4 based on the preset pulse width modulation period, the current moving power, and the current average output power. This first loss parameter reflects how many minimum heating units (such as half-waves) each coil 4 should skip in a complete PWM cycle, thereby determining the proportion of its actual on-time and thus regulating its output power. Through this calculation process, the electromagnetic heating device 100 can ensure that all heating coils 4 operate at the same power in the same frequency mode, and adjust the on / off duration ratio according to actual heating needs, so that the actual average output power of the electromagnetic heating device 100 matches the working power allocated to each individual coil 4. In this way, by acquiring the moving power and average output power of the electromagnetic heating device 100 and calculating the loss parameters of each coil 4 accordingly, coordinated control of multiple coils 4 can be achieved, thereby optimizing overall heating efficiency and improving the user experience.

[0091] Please see Figure 3 In one embodiment, the first dropout parameter is the first dropout duty cycle;

[0092] The relationship between the first loss duty cycle and the current average output power is as follows:

[0093] Current average output power = Current mobile power × First drop duty cycle / Preset pulse width modulation period.

[0094] In this embodiment, the first dropout parameter is specifically defined as the first dropout duty cycle, which characterizes the proportion of actual on-time of each coil 4 within a pulse width modulation (PWM) cycle. There is a clear mathematical relationship between the first dropout duty cycle and the current average output power, expressed as: Current average output power = Current moving power × First dropout duty cycle / Preset PWM cycle. For example, when the target power is 100W, and the electromagnetic heating device 100 is configured with two coils 4, if the working power allocated to each coil 4 is 50W, and the electromagnetic heating device 100 detects a current moving power of 100W, and the previously used first dropout duty cycle was 20%, then the calculated current average output power is 100 × 20 / 50 = 40W, lower than the expected 50W. In this case, the electromagnetic heating device 100 can adjust the first dropout duty cycle from 20% to 25%, increasing the current average output power to 100 × 25 / 50 = 50W, thus matching it with the working power allocated to a single coil 4. Through the technical solution of this embodiment, the electromagnetic heating device 100 can adjust the on-time ratio of each coil 4 based on the real-time acquired power data in the same frequency mode, so as to achieve precise control of the output power of the multiple coils 4 and ensure the uniformity, stability and efficiency of the heating process.

[0095] Please see Figure 4 In one embodiment, step S400 specifically includes:

[0096] S410A. Adjust the working frequency of the coil so that the current average output power of the electromagnetic heating equipment reaches the working power of the coil.

[0097] S420A: When the working frequency of the coil reaches the preset frequency and the current average output power of the electromagnetic heating device does not reach the working power of the coil, adjust the first loss parameter of the coil until the current average output power of the electromagnetic heating device reaches the working power of the coil.

[0098] In this embodiment, step S320 can be further refined to ensure that the current average output power of the electromagnetic heating device 100 reaches the working power allocated to each coil 4 by adjusting the operating frequency of the coil 4 and the first loss parameter. First, in step S321A, the electromagnetic heating device 100 attempts to match the current average output power of the electromagnetic heating device 100 with the working power of the coil 4 by adjusting the operating frequency of the coil 4. If, in step S322A, it is determined that the operating frequency of the 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 coil 4, then the first loss parameter of the coil 4 is adjusted until the current average output power of the electromagnetic heating device 100 reaches the working power allocated to each coil 4. Through this series of control measures, the coordinated operation of multiple coils 4 can be achieved, ensuring the uniformity and stability of the heating process, while optimizing overall heating efficiency and user experience.

[0099] Please see Figure 5 In one embodiment, step S320 specifically includes:

[0100] S321B: When the working mode of the electromagnetic heating device is determined to be time-sharing mode, obtain the preset minimum number of heating units and coils.

[0101] S322B calculates the second loss parameter of each coil based on the preset pulse width modulation period, preset minimum heating unit, number of coils, and working power of each coil.

[0102] In this embodiment, when the working mode of the electromagnetic heating device 100 is determined to be time-sharing mode, in order to achieve time-sharing power control and coordinated operation of multiple coils 4, step S320 can be further refined into two key steps to complete the power allocation and calculation process of the second dropout parameter. First, in step S321B, the electromagnetic heating device 100 obtains the preset minimum heating unit and the number of coils 4. Since a PWM cycle can be composed of several preset minimum heating units, each minimum heating unit can be a half-wave or other set basic time unit. Next, in step S322B, the electromagnetic heating device 100 can calculate the second dropout parameter corresponding to each coil 4 based on the preset pulse width modulation period, the preset minimum heating unit, the number of coils 4, and the working power of each coil 4. This process ensures that the power output of each coil 4 can reach its allocated working power by adjusting the number of minimum heating units skipped by each coil 4 in a PWM cycle, thereby achieving efficient coordinated operation of multiple coils 4 in time-sharing mode, optimizing heating efficiency, and ensuring the uniformity and stability of the heating process. These two steps enable fine-grained control of the multi-line disk 4 in time-sharing mode, improving overall performance and user experience.

[0103] Please see Figure 5 , Figure 7 and Figure 8 In one embodiment, the second loss parameter includes the second loss duty cycle, the loss quotient, and the loss remainder;

[0104] The formula for calculating the duty cycle of the second loss is:

[0105] Second dropout duty cycle = preset minimum heating unit + working power of a single coil 4 × (preset pulse width modulation period - number of coils 4 × preset minimum heating unit) / target power;

[0106] The formula for calculating the wave quotient is:

[0107] Dropout quotient = Second dropout duty cycle of a single coil 4 / Minimum second dropout duty cycle among multiple coils 4;

[0108] The formula for calculating the residual wave is:

[0109] Loss of wave = the second loss of wave duty cycle of a single coil 4 % of the smallest second loss of wave duty cycle among multiple coils 4.

[0110] In this embodiment, in time-sharing mode, the electromagnetic heating device 100's second wave loss parameter specifically includes three key control parameters: second wave loss duty cycle, wave loss quotient, and wave loss remainder. These parameters are used to achieve fine-grained control of the output power of multiple coils 4. The second wave loss duty cycle represents the minimum proportion of heating units that should be activated for each coil 4 within one PWM cycle. Its calculation is based on a preset minimum heating unit, the operating power of a single coil 4, a preset pulse width modulation period, and a target power. The expression is: Second wave loss duty cycle = Preset minimum heating unit + Operating power of a single coil 4 × (Preset pulse width modulation period - Number of coils 4 × Preset minimum heating unit) / Target power. This expression indicates that, under the premise of meeting the overall target power, the activation duration of different coils 4 can be adjusted according to their allocated operating power, thereby achieving precise power matching. Based on this, the electromagnetic heating device 100 further calculates the wave loss quotient and wave loss remainder to coordinate the working rhythm and wave loss allocation relationship among multiple coils 4. The ripple quotient is defined as the ratio of the second ripple duty cycle of a single coil 4 to the minimum second ripple duty cycle among all coils 4, i.e.: Ripple quotient = Second ripple duty cycle of a single coil 4 / Minimum second ripple duty cycle among multiple coils 4. It is used to measure the proportional relationship of each coil 4 relative to the minimum on-time. The ripple remainder represents the remainder after taking the modulus of this ratio, i.e.: Ripple remainder = Second ripple duty cycle of a single coil 4 % Minimum second ripple duty cycle among multiple coils 4. It is used to determine the proportion of on-time remaining after dividing by the minimum ripple quotient. Through the coordinated calculation of these three parameters, the electromagnetic heating device 100 can control the on- and off rhythm of each coil 4 in time-sharing mode, so that the coils 4 with different power requirements can operate in an orderly manner within the same PWM cycle, ensuring that their respective power output requirements are met while 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.

[0111] To illustrate the application of the above parameters more intuitively, the following two examples will explain:

[0112] In the first example, assuming the target power is 3600W, and the electromagnetic heating device 100 is configured with two coils 4, namely coil 1 and coil 2, where coil 1 is allocated 800W of operating power and coil 2 is allocated 2800W of operating power. The preset pulse width modulation period is 50, and the preset minimum heating unit is 1, which can be adjusted to 2 or 3, etc., according to actual needs. In this embodiment, the specific duration of the preset minimum heating unit is 10ms, and the total duration of 50 preset minimum heating units is 500ms. Based on these assumed data, the second loss ratio of reel 4 in line 1 can be calculated as: 1 + 800 × (50 - 2 × 1) / 3600 = 11, and the second loss ratio of reel 4 in line 2 is: 1 + 2800 × (50 - 2 × 1) / 3600 = 1 + 37.33 = 38.33. It should be noted that since the second loss duty cycle must be an integer, and considering prioritizing the output capacity of the high-power reel 4, the second loss ratio of reel 4 in line 2 should be: 38 + 1 = 39. From the second loss ratio of reel 4 in line 1, its loss quotient is: 11 / 11 = 1, and the loss remainder is: 11%11 = 0; from the second loss ratio of reel 4 in line 2, its loss quotient is: 39 / 11 = 3, and the loss remainder is: 39%11 = 6.

[0113] In the second example, it is assumed that the target power is 4800W, and the electromagnetic heating device 100 is equipped with three coils 4, namely coil 3, coil 4, and coil 5. The working power allocated to coil 3 is 800W, the working power allocated to coil 4 is 1200W, and the working power allocated to coil 5 is 2800W. The preset pulse width modulation period is 50, the preset minimum heating unit is 1, and the specific duration is 10ms. Based on these assumed data, the second loss ratio of reel 4 for line 3 can be calculated as: 1 + 800 × (50 - 3 × 1) / 4800 = 1 + 7.83 = 8.83; the second loss ratio of reel 4 for line 4 is: 1 + 1200 × (50 - 3 × 1) / 4800 = 1 + 11.75 = 12.75; and the second loss ratio of reel 4 for line 5 is: 1 + 2800 × (50 - 3 × 1) / 4800 = 1 + 27.41 = 28.41. It should be noted that since the second loss duty cycle must be an integer, and considering the priority of ensuring the output capacity of high-power reel 4, the second loss ratio of reel 4 for line 3 should be 8, the second loss ratio of reel 4 for line 4 should be 12, and the second loss ratio of reel 4 for line 5 should be: 28 + 2 = 30. Based on the second wave loss ratio of panel 4 on line 3, its wave loss quotient is: 8 / 8=1, wave loss remainder 8%8=0; based on the second wave loss ratio of panel 4 on line 4, its wave loss quotient is: 12 / 8=1, wave loss remainder is: 12%8=4; based on the second wave loss ratio of panel 4 on line 5, its wave loss quotient is: 30 / 8=3, wave loss remainder is: 30%8=6.

[0114] These two examples demonstrate that by introducing three parameters—the second wave loss duty cycle, the wave loss quotient, and the wave loss remainder—the electromagnetic heating device 100 can achieve precise control of the multi-coil coil 4 in time-sharing mode. Regardless of whether it's a two-coil or three-coil 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 pot's condition and power distribution, ensuring the uniformity, stability, and efficiency of the heating process, thereby improving the performance of the electromagnetic heating device 100 and the user experience.

[0115] Please see Figures 6 to 8 In one embodiment, step S400 specifically includes:

[0116] S410B: Select the single coil with the smallest second wave loss ratio, control the coil to work with the corresponding wave loss ratio and the preset minimum heating unit, and control all coils with non-zero wave loss ratios to work with the corresponding wave loss ratio plus one preset minimum heating unit, and cyclically execute the minimum non-zero wave loss ratio for several cycles.

[0117] And / or, S420B, select the single coil with the smallest second wave loss ratio, control the coil to work with the corresponding wave loss quotient and the preset minimum heating unit, and control the coil with the wave loss quotient greater than the minimum wave loss quotient to work with the corresponding wave loss quotient plus one preset minimum heating unit, and cyclically execute the difference between other non-zero wave loss residue and the minimum non-zero wave loss residue for several cycles.

[0118] S430B controls all coils to operate with their respective corresponding loss quotient preset minimum heating units, and cyclically executes preset cycles; wherein, the sum of the number of preset minimum heating units contained in the minimum non-zero loss remainder cycles, the difference cycles, and the preset cycles is equal to the total number of preset minimum heating units in the preset pulse width modulation cycle.

[0119] In this embodiment, step S400 can also achieve control of the multiple coils 4 in time-sharing mode through three steps, ensuring that each coil 4 operates efficiently and collaboratively according to its allocated working power. First, in step S410B, the single coil 4 with the smallest second wavelet loss ratio is selected as the priority adjustment target, and this coil 4 is controlled to work with a preset minimum heating unit corresponding to the number of wavelet loss quotients; at the same time, for all other coils 4 with non-zero wavelet loss quotients, an additional preset minimum heating unit is added to their respective wavelet loss quotients, and the cycle number corresponding to the "minimum non-zero wavelet loss surplus" is executed cyclically. In addition, step S420B can be used alternatively to further refine the control: the coil 4 with the smallest second wavelet loss ratio is still selected, and the number of working units is set based on its wavelet loss quotient; for other coils 4 with wavelet loss quotients greater than the minimum value, an additional preset minimum heating unit is added to their wavelet loss quotients, and the cycle number of the "difference between other non-zero wavelet loss surplus and minimum non-zero wavelet loss surplus" is executed cyclically, thereby more accurately compensating for the energy differences between different coils 4. Finally, in step S430B, all coils 4 uniformly operate according to their respective corresponding loss ratios, setting a preset minimum number of heating units, and cyclically execute for a preset number of cycles. The total number of preset minimum heating units included in the "minimum non-zero loss remainder cycles," "difference cycles," and "preset cycles" involved in the above three steps 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 power distribution control among multiple coils 4 be achieved, but heating efficiency and the uniformity and stability of heat energy distribution can also be improved, thereby enhancing the overall performance of the electromagnetic heating device 100 and the user experience.

[0120] To illustrate the application of the above steps more intuitively, the following explanation will be provided using the two examples above:

[0121] In the first example, the second wave loss ratio of reel 4 (line 1) is 11, and the second wave loss ratio of reel 4 (line 2) is 39. Therefore, the smallest second wave loss ratio corresponds to reel 4 (line 1). Since the wave loss remainder of reel 4 (line 2) is 6, it indicates that 6 additional preset minimum heating units are needed to compensate for this remainder. Figure 7As shown, the electromagnetic heating device 100 first controls coil 1 (4) to operate with one preset minimum heating unit, and simultaneously controls coil 2 (4) to operate with 3+1=4 preset minimum heating units, repeating this cycle for 6 cycles. Each preset minimum heating unit lasts 10ms. In each cycle, coil 1 (4) operates for 10ms, and coil 2 (4) operates for 40ms. In each cycle, the two coils (4) consume a total of 1+4=5 heating units. Over 6 cycles, a total of 5×6=30 heating units are consumed. Since the entire PWM cycle contains 50 heating units (i.e., the preset pulse width modulation cycle is 50, and each preset minimum heating unit is 1), 20 heating units remain unused after the first 6 cycles. Next, the electromagnetic heating device 100 continues to control coil 1 (4) to operate with one heating unit and coil 2 (4) to operate with three heating units, repeating this cycle for 5 cycles. In each cycle, coil 1 (4) operates for 10ms, and coil 2 (4) operates for 30ms. In each cycle, the two coils consume a total of 1 + 3 = 4 heating units. Over 5 cycles, a total of 20 heating units are consumed. This completes the energy distribution throughout the entire PWM cycle.

[0122] In the second example, the second wave loss ratio of reel 3 (4) is 8, that of reel 4 (4) is 12, and that of reel 5 (4) is 30. Therefore, the smallest second wave loss ratio corresponds to reel 3 (4). Since the wave loss remainder of reel 4 (4) is 4 and that of reel 5 (4) is 6, this indicates that they require an additional 4 and 6 preset minimum heating units, respectively, for compensation. Figure 8 As shown, the electromagnetic heating device 100 first controls coil 3 (4) to operate with 1 heating unit, coil 4 (4) to operate with 1+1=2 heating units, and coil 5 (4) to operate with 3+1=4 heating units, and executes this cycle 4 times. Each cycle consumes 1+2+4=7 heating units, for a total of 28 heating units consumed over 4 cycles. The entire PWM cycle contains 50 heating units, so 22 remain unused. Considering that coil 5 (4) needs to be compensated for 6 remainders, and only 4 compensations have been completed so far (1 unit per cycle), 2 more remainders need to be compensated. Therefore, the device continues to control coils 3 (4), 4 (4), and 5 (4) to operate with 1, 1, and 4 heating units respectively, executing this cycle 2 times, consuming 6 heating units per cycle, for a total consumption of 12 units. At this point, 10 heating units remain unused. Finally, the device controls the three to operate with 1, 1, and 3 heating units respectively, and executes the cycle twice, consuming 5 heating units each time, for a total of 10, thus completing the energy distribution for the entire PWM cycle.

[0123] The present invention also proposes a control device 1 for an electromagnetic heating device 100, please refer to [link to relevant documentation]. Figure 9The 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. The specific structure of the control method of the electromagnetic heating device 100 refers to the above embodiments. Since the control device 1 of the electromagnetic heating device 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0124] The present invention also proposes an electromagnetic heating device 100, please refer to [link / reference]. Figure 10 The electromagnetic heating device 100 includes a panel 3, a rectifier and filter circuit 2, a switching device 5, a coil 4, and a control device 1. The specific structure of the control device 1 is as described in the above embodiments. Since this electromagnetic heating device 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0125] The electromagnetic heating device 100 can be an induction cooker, a steaming or cooking robot, etc., and is not specifically limited. The electromagnetic heating device 100 may include, but is not limited to, a rectifier and filter circuit 2, a switching device 5, a coil 4, and a control device 1. The panel 3 can be a touch control panel 3, used both to place cookware and as the main interface for user interaction with the electromagnetic heating device 100; the rectifier and filter circuit 2 can be composed of a full-wave rectifier, a half-wave rectifier, and a filter, used to convert externally input AC power into DC power and remove fluctuations in the current to provide stable DC power; the switching device 5 may include one or more combinations of insulated-gate bipolar transistors (IGBTs), metal-oxide-semiconductor field-effect transistors (MOSFETs), and silicon controlled rectifiers (SCRs), used to convert the DC power output from the rectifier and filter circuit 2 into high-frequency AC power; the coil 4 may include one or more combinations of single-layer spiral coils and multi-layer spiral coils, used to generate a high-frequency alternating magnetic field when high-frequency AC power passes through.

[0126] To further improve heating efficiency and uniformity, and enhance usability, this embodiment provides multiple coils 4. Multiple coils 4 can simultaneously heat different areas of the pot bottom, thereby accelerating the heating rate and shortening cooking time. Compared to a single coil 4, multiple coils 4 effectively improve the problem of uneven heating of the pot bottom, especially when using larger pots, as they promote more even heat distribution and prevent food from burning or underheating. Furthermore, for pots of different sizes, the electromagnetic heating device 100 with multiple coils 4 can automatically select the appropriate coil combination based on the pot size, and even support the simultaneous use of multiple pots of different sizes without interference.

[0127] It is worth noting that some existing electromagnetic heating devices 100 (such as some induction cookers) have also adopted multiple coils 4 to achieve "zoneless heating." "Zoneless heating" refers to a heating method where the cookware is covered by multiple coils 4 without explicit zone control, resulting in more uniform heating of the entire cookware. However, the zoneless heating control of current electromagnetic heating devices 100 still faces several technical bottlenecks: First, the control strategy is complex, requiring comprehensive consideration of factors such as power distribution and heating time coordination among the coils 4, making design and implementation difficult; second, due to the high control complexity, it is difficult to fully utilize the maximum heating capacity of each coil 4, leading to increased heating time and energy consumption, affecting overall efficiency; third, during the heating process, problems such as unstable working status of the coils 4 or electromagnetic interference may occur, leading to abnormal noise and reduced user experience. Therefore, although the multi-coil 4 structure has significant advantages in improving heating performance, how to achieve efficient, stable, and intelligent control remains a key issue that urgently needs to be addressed.

[0128] To address the aforementioned challenges, the control device 1 of this embodiment can acquire the target power and preset pulse width modulation period of the electromagnetic heating device 100. First, it allocates the required operating power for each coil 4 according to the target power, thereby achieving a reasonable allocation of the target power. Then, it calculates the dropout parameters of each coil 4 based on the acquired pulse width modulation period, and controls the multiple coils 4 according to the calculated dropout parameters, ensuring that the output power of each coil 4 reaches the corresponding operating power. This control method not only improves the efficiency of multi-coil 4 working together and avoids energy waste, but also enhances the stability and controllability of the multi-coil 4 heating process, reduces abnormal noise problems caused by power fluctuations or electromagnetic interference, thereby improving the user experience and enhancing the overall performance of the electromagnetic heating device 100.

[0129] The above are merely exemplary embodiments of the present invention and do not limit the scope of the patent of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A control method for an electromagnetic heating device, characterized in that, The electromagnetic heating device includes multiple 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 equipment; The operating power of each coil is determined based on the target power. Calculate the dropout parameters of each of the coils according to the preset pulse width modulation period; Based on the calculated loss parameters, control the operation of each coil so that the output power of each coil reaches the corresponding operating power. The steps of obtaining the target power and preset pulse width modulation period of the electromagnetic heating device further include: Get the current status of the cookware; The step of calculating the loss parameters of each coil according to the preset pulse width modulation period specifically includes: The working mode of the electromagnetic heating device is determined 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 power of each coil is the same. In the time-sharing mode, at least two coils have different working power. Based on the preset pulse width modulation period, the loss parameters of each of the coils corresponding to the determined working mode are calculated; The step of calculating and determining the loss parameters of each coil corresponding to the operating mode based on the preset pulse width modulation period specifically includes: When the working mode of the electromagnetic heating device is determined to be time-sharing mode, the preset minimum number of heating units and coils is obtained. Based on the preset pulse width modulation period, the preset minimum heating unit, the number of coils, and the operating power of each coil, the second loss parameter of each coil is calculated. The second loss parameters include the second loss duty cycle, loss quotient, and loss remainder; The formula for calculating the second dropout duty cycle is: The second dropout duty cycle = preset minimum heating unit + working power of a single coil × (preset pulse width modulation period - number of coils × preset minimum heating unit) / target power; The formula for calculating the wavelet loss quotient is: The dropout quotient = the second dropout duty cycle of a single coil / the smallest second dropout duty cycle among multiple coils; The formula for calculating the lost wave residue is: The dropout duty cycle is equal to MOD (the second dropout duty cycle of a single coil, or the smallest second dropout duty cycle among multiple coils).

2. The control method for the electromagnetic heating device as described in claim 1, characterized in that, The step of calculating and determining the loss parameters of each coil corresponding to the operating mode based on the preset pulse width modulation period specifically includes: When the working mode of the electromagnetic heating device is determined to be the same frequency mode, the current moving power and the current average output power of the electromagnetic heating device are obtained, and the current moving power is the total power actually output by the electromagnetic heating device at present. The first loss parameter of each coil is calculated based on the preset pulse width modulation period, the current moving power, and the current average output power.

3. The control method for the electromagnetic heating device as described in claim 2, characterized in that, The first dropout parameter is the first dropout duty cycle; The relationship between the first loss duty cycle and the current average output power is as follows: The current average output power = the current mobile power × the first dropout duty cycle / preset pulse width modulation period.

4. The control method for the electromagnetic heating device as described in claim 2, characterized in that, The step of controlling the operation of each coil based on the calculated loss parameters to make the output power of each coil reach the corresponding operating power specifically includes: Adjust the operating frequency of the coil so that the current average output power of the electromagnetic heating device reaches the operating power of the coil. When it is determined that the operating frequency of the coil has reached the preset frequency and the current average output power of the electromagnetic heating device has not reached the operating power of the coil, the first loss parameter of the coil is adjusted until the current average output power of the electromagnetic heating device reaches the operating power of the coil.

5. The control method for the electromagnetic heating device as described in claim 1, characterized in that, The step of controlling the operation of each coil based on the calculated loss parameters to make the output power of each coil reach the corresponding operating power specifically includes: Select the single coil with the smallest second wave loss ratio, control the coil to work with the corresponding wave loss quotient and the preset minimum heating unit, 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 cyclically execute the minimum non-zero wave loss remainder for several cycles. And / or, select the single coil with the smallest second wave drop ratio, control the coil to work with a preset minimum heating unit corresponding to the wave drop ratio, and control the coil with a wave drop ratio greater than the minimum wave drop ratio to work with a preset minimum heating unit according to the corresponding wave drop ratio, and cyclically execute the difference between other non-zero wave drop ratios and the minimum non-zero wave drop ratio for a number of cycles. Control all coils to work at their respective corresponding preset minimum heating units, and execute the preset number of cycles. Wherein, the sum of the minimum non-zero loss remainder cycles, the difference cycles, and the preset cycles contains the preset minimum heating unit number, which is equal to the total preset minimum heating unit number in the preset pulse width modulation cycle.

6. A control device for an electromagnetic heating equipment, characterized in that, include: Memory; A processor, a control program for an electromagnetic heating device stored in the memory and executed by the processor, wherein the control program for the electromagnetic heating device, when executed by the processor, implements the control method for the electromagnetic heating device as described in any one of claims 1 to 5.

7. An electromagnetic heating device, characterized in that, Includes the control device for the electromagnetic heating equipment as described in claim 6.

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