Electromagnetic heating equipment and its power determination method, control method and control device

Abstract

This invention discloses an electromagnetic heating device and its power determination method, control method, and control device, relating to the technical field of electromagnetic heating devices. The power determination method for the electromagnetic heating device includes: acquiring the input frequency of the power supply to the electromagnetic heating device and determining a power sampling period based on the input frequency; determining the number of samplings and the sampling interval corresponding to the power sampling period; sampling a corresponding number of instantaneous power values ​​within the power sampling period using the determined number of samplings and sampling intervals; and determining the average of the sampled instantaneous power values ​​as the current power of the electromagnetic heating device. The power determination method provided by this invention aims to improve the accuracy of the current power of the electromagnetic heating device.

Description

Technical Field

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

[0002] Electromagnetic heating equipment boasts advantages such as high heating efficiency and ease of use, and is gradually replacing traditional gas heating equipment. However, existing electromagnetic heating equipment relies on a relatively simple method for sampling current power, making it difficult to adapt to differences in power grids across different regions or unstable mains power input. Therefore, errors easily occur when determining the current power, leading to inaccurate power readings. Summary of the Invention

[0003] The main objective of this invention is to provide an electromagnetic heating device and its power determination method, control method, and control device, aiming to improve the sampling accuracy of the current power of the electromagnetic heating device.

[0004] To achieve the above objectives, the present invention proposes a method for determining the power of an electromagnetic heating device, comprising:

[0005] Obtain the input frequency of the power supply for the electromagnetic heating device, and determine the power sampling period based on the input frequency;

[0006] Based on the power sampling period, determine the number of samplings and the sampling interval corresponding to the power sampling period;

[0007] During the power sampling period, a corresponding number of instantaneous power samples are taken based on the determined number of sampling times and sampling intervals.

[0008] The average value of the corresponding number of instantaneous power samples is determined as the current power of the electromagnetic heating device.

[0009] In one embodiment, determining the power sampling period based on the input frequency includes:

[0010] Determine the half-wave period corresponding to the input frequency;

[0011] The first preset integer multiple of the half-wave period is configured as the power sampling period.

[0012] In one embodiment, determining the number of samplings and the sampling interval corresponding to the power sampling period based on the power sampling period includes:

[0013] Based on the duration of the power sampling period, the number of samplings corresponding to the power sampling period is determined; wherein, the duration of the power sampling period is positively correlated with the number of samplings.

[0014] Based on the duration of the power sampling period and the determined number of samplings, a sampling interval corresponding to the power sampling period is determined.

[0015] In one embodiment, the power determination method for the electromagnetic heating device further includes:

[0016] To obtain the zero-crossing point of the power supply for the electromagnetic heating equipment;

[0017] Based on the zero-crossing point of the power supply of the electromagnetic heating device, the instantaneous power is sampled after a first delay, where the first delay is equal to the duration corresponding to the sampling interval.

[0018] In one embodiment, the step of sampling a corresponding number of instantaneous power samples according to the determined number of sampling times and sampling intervals during the power sampling period includes:

[0019] During the power sampling period, a corresponding number of input currents and input voltages are sampled at a defined number of sampling times and sampling intervals.

[0020] The instantaneous power of a corresponding number is determined based on the corresponding number of input currents and input voltages.

[0021] The present invention also provides a control method for an electromagnetic heating device, the control method comprising:

[0022] Determine the current power of the electromagnetic heating device according to the power determination method of the electromagnetic heating device described in any of the above descriptions;

[0023] Determine the target power of the electromagnetic heating equipment;

[0024] The operating power of the electromagnetic heating device is adjusted based on the difference between the current power and the target power, so that the current power approaches the target power.

[0025] In one embodiment, adjusting the operating power of the electromagnetic heating device based on the difference between the current power and the target power, so that the current power approaches the target power, includes:

[0026] The power adjustment amplitude is determined based on the difference between the current power and the target power; wherein the power adjustment amplitude is positively correlated with the difference between the current power and the target power.

[0027] The operating power of the electromagnetic heating device is adjusted according to the power adjustment range so that the current power approaches the target power.

[0028] In one embodiment, the control method for the electromagnetic heating device further includes:

[0029] Obtain the power threshold for moving the pot;

[0030] When the current power is less than the pot-moving power threshold, it is determined that pot-moving has occurred, and the power switch of the electromagnetic heating device is controlled to stop working.

[0031] In one embodiment, the pot-moving power threshold is a dynamic pot-moving power threshold, and the process of obtaining the pot-moving power threshold includes:

[0032] If the current power is not less than the target power, the pot-moving power threshold is updated to the power value corresponding to the target power;

[0033] If the current power is less than the target power and the current power is greater than the pot-moving power threshold, the pot-moving power threshold is updated to the power value corresponding to the current power.

[0034] In one embodiment, the control method of the electromagnetic heating device further includes:

[0035] The electromagnetic heating device is controlled to enter frequency dithering mode;

[0036] Based on the difference between the current power and the minimum operating power, the frequency dithering amplitude is determined, and the power switch of the electromagnetic heating device is controlled to dither according to the frequency dithering amplitude.

[0037] The present invention also provides a control device for implementing the power determination method of the electromagnetic heating device as described in any of the above claims, and / or, the control device for implementing the control method of the electromagnetic heating device as described in any of the above claims.

[0038] The present invention also provides an electromagnetic heating device, which includes the control device as described above.

[0039] In summary, the power determination method for electromagnetic heating devices provided by this invention can improve the accuracy of the current power of the electromagnetic heating device. Based on this method, the input frequency of the power supply to the electromagnetic heating device is first obtained, and the power sampling period is dynamically determined according to this input frequency. Thus, when the input frequency changes, such as due to a change in the area of ​​use or fluctuations in the mains power, the power sampling period can be adaptively adjusted to ensure that multiple representative instantaneous power values ​​within at least one complete half-wave waveform are collected within the power sampling period. The average power is then calculated based on these multiple instantaneous power values, and this average power is the current power of the electromagnetic heating device, i.e., the output power. Therefore, this method avoids the problems of incomplete sampling waveforms and missing sampling points caused by using a fixed power sampling period in the prior art, improving the accuracy and consistency of the finally determined current power. Attached Figure Description

[0040] 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.

[0041] Figure 1 A flowchart of the first embodiment of the method for determining the power of an electromagnetic heating device provided by the present invention;

[0042] Figure 2 The voltage waveforms of the power supply before and after rectification are shown.

[0043] Figure 3 A circuit diagram of an embodiment of the electromagnetic heating device provided by the present invention;

[0044] Figure 4 A sampling waveform diagram illustrating the power determination method for the electromagnetic heating device provided by the present invention;

[0045] Figure 5 A flowchart of the second embodiment of the method for determining the power of an electromagnetic heating device provided by the present invention;

[0046] Figure 6 A flowchart of the third embodiment of the method for determining the power of an electromagnetic heating device provided by the present invention;

[0047] Figure 7 A flowchart of the fourth embodiment of the method for determining the power of an electromagnetic heating device provided by the present invention;

[0048] Figure 8 A flowchart of the fifth embodiment of the method for determining the power of an electromagnetic heating device provided by the present invention;

[0049] Figure 9 A flowchart of the first embodiment of the control method for the electromagnetic heating device provided by the present invention;

[0050] Figure 10 A flowchart of the second embodiment of the control method for the electromagnetic heating device provided by the present invention;

[0051] Figure 11 A flowchart of the third embodiment of the control method for the electromagnetic heating device provided by the present invention;

[0052] Figure 12 A flowchart of the fourth embodiment of the control method for the electromagnetic heating device provided by the present invention;

[0053] Figure 13 This is a flowchart of the fifth embodiment of the control method for the electromagnetic heating device provided by the present invention.

[0054] Explanation of icon numbers:

[0055] 10. Rectifier circuit; 20. Resonant circuit; 30. Power switch; 40. Switch drive circuit.

[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 step designations such as S100 and S200 are used in this document for the purpose of more clearly and concisely describing the corresponding content, and do not constitute a substantial limitation on the order. Those skilled in the art may execute S200 first and then S100 in specific implementation, but these should all be within the protection scope of this invention.

[0059] Electromagnetic heating equipment is widely used in household kitchen appliances. It is a heating device that converts energy based on the principle of electromagnetic induction. Taking an induction cooker as an example, its basic working principle is to use an internal high-frequency inverter circuit to rectify the mains power into a high-frequency alternating current. This current generates an alternating magnetic field in the heating coil, which acts on the magnetic cookware, inducing eddy currents on the surface of the cookware and thus producing Joule heating. It is important to note that due to the high heating efficiency and ease of cleaning of electromagnetic heating equipment such as induction cookers, it has rapidly gained popularity and widespread application globally. Therefore, if manufacturers of electromagnetic heating equipment want to target various regions worldwide, they need to configure their equipment to be compatible with different mains power supplies in different regions, ensuring reliability and stability even with varying input mains power.

[0060] However, existing electromagnetic heating equipment has certain limitations in practical use, especially in power control. This makes it unsuitable for different countries and regions, or unable to handle input frequency fluctuations, leading to inaccurate and inconsistent determination of the current power. The limitations are explained below using some exemplary electromagnetic heating devices. These devices use fixed-frequency AD sampling to calculate input power, sampling voltage and current signals at preset time intervals and calculating the current power based on these samples. For example, instantaneous power is sampled every 5 seconds, and the average of the sampled instantaneous power is calculated to determine the average power or current power. It's important to note that while this calculation method has high stability at certain fixed input frequencies and can accurately reflect the actual current power under stable power grid conditions, the fixed sampling method becomes inaccurate and inconsistent when applied to scenarios with fluctuating power grid frequencies or across different countries and regions. The reason is that, since AC mains power uses a fixed sampling duration, it cannot adapt to changes in AC waveforms. This means that for different AC waveforms, it may be impossible to capture all sampling points within a complete half-wave or full-wave signal, resulting in missing or misaligned sampling points and thus errors in current power sampling. Therefore, under the above scenarios or conditions, existing electromagnetic heating equipment exhibits large errors in current power calculation, and its power control algorithm has low effectiveness and accuracy.

[0061] It's important to note that inaccurate or inconsistent current power readings not only affect the stability of the electromagnetic heating device's output power but also the effectiveness and accuracy of numerous power control algorithms. In some cases, the control device adjusts the duty cycle of the power switch's drive signal based on the deviation between the current power and the set target value, aiming to bring the current power closer to the target power. In this scenario, if there's an error between the determined current power and the actual current power, the control device will base its judgments on these inaccurate readings, leading to frequent fluctuations in output power or deviations from the user-set value, resulting in the aforementioned output power instability. Furthermore, more advanced functions, such as intelligent temperature control, pot-movement detection, and frequency dithering control, also rely on the current power as a basis for judgment. Low accuracy of the current power will significantly reduce the effectiveness of these advanced functions and may even damage the electromagnetic heating device itself, reducing its lifespan. Therefore, the accuracy of the determined current power directly impacts the overall functionality of the electromagnetic heating device and the user experience.

[0062] It should be noted that the above explanation only uses induction cookers as an example of electromagnetic heating equipment. However, similar issues exist in other electromagnetic heating devices. For example, in products such as induction cooktops, induction kettles, induction steam ovens, industrial electromagnetic heaters, and induction water heaters, the accuracy of power control can also be affected by factors such as voltage fluctuations and frequency deviations, leading to inaccurate power detection.

[0063] Therefore, to improve the accuracy of the current power of an electromagnetic heating device, this invention proposes a method for determining the power of an electromagnetic heating device. In one embodiment, as... Figure 1 As shown, the power determination method for the electromagnetic heating device includes steps S100 to S400.

[0064] The electromagnetic heating equipment can be one of the following: induction cooker, induction stove, induction kettle, induction steam oven, industrial electromagnetic heater, electromagnetic water heater, etc. The specific electromagnetic heating equipment is not limited here.

[0065] In this embodiment, step S100 involves obtaining the input frequency of the power supply for the electromagnetic heating device and determining the power sampling period based on the input frequency.

[0066] Understandably, electromagnetic heating equipment needs to address the following issues: First, the input frequency of the power supply for electromagnetic heating equipment may vary between different countries and regions. For example, in some countries or regions, the mains frequency is 50Hz, while in others it is 60Hz. Second, the level of power grid infrastructure varies across different countries and regions. Especially in areas with tight power supply, aging power grids, or large load fluctuations, the actual mains frequency in operation often experiences a certain degree of deviation or uncontrollable fluctuations.

[0067] It should be noted that, as Figure 2 As shown, the mains power is alternating current (refer to...). Figure 2 (The A-waveform). For example... Figure 3 As shown, electromagnetic heating equipment typically includes a rectifier circuit 10, a resonant circuit 20, a power switch 30, and a switch drive circuit 40 connected in sequence. The input terminal of the rectifier circuit 10 is connected to the mains power and is supplied with an AC voltage. When the switch drive circuit 40 drives the power switch 30 with a preset PWM drive signal, the voltage at the output terminal of the rectifier circuit 10 changes from a constant voltage to a periodically changing voltage, for example... Figure 2 The B waveform in the diagram represents the voltage waveform of a half-wave rectified circuit. Therefore, when sampling instantaneous power to calculate the current power, it is necessary to ensure that multiple representative instantaneous power values ​​within a complete half-wave cycle are sampled, and the average power is calculated to obtain a representative average power as the current power of the electromagnetic heating device.

[0068] In some exemplary electromagnetic heating devices, sampling is performed using a fixed power sampling period. When addressing the two issues mentioned above, inaccurate power sampling can occur. Existing electromagnetic heating devices use a fixed input frequency as a reference for setting the power sampling time. In some examples, the electromagnetic heating device uses 50Hz as a reference and sets a sampling time of 90 seconds. 50Hz translates to a complete AC cycle of 20 milliseconds, and a half-wave period of 10 milliseconds. A 90-millisecond sampling time can collect data for exactly nine complete half-wave periods, thus allowing for a relatively accurate calculation of the average power within that time period, which can then be used as the actual output power of the electromagnetic heating device. However, if the two problems mentioned above occur—namely, a change in the application area of ​​the electromagnetic heating equipment or fluctuations in the input frequency (e.g., a frequency change from 50Hz to 60Hz)—the electromagnetic heating equipment is factory-set with a fixed sampling time of 90 milliseconds. The half-wave period corresponding to 60Hz is 16.7 milliseconds divided by 2, which is 8.35 milliseconds. 90 milliseconds divided by 8.35 milliseconds equals 10.78, meaning 10.78 half-wave periods are sampled. Therefore, the average power calculated within 10 of these 10.78 half-wave periods is accurate. However, in the remaining 0.84 half-wave periods, only a portion of the waveform is sampled, lacking a complete trend of voltage and current changes. This means that the data in this remaining portion cannot accurately reflect the actual power level within that period. Therefore, this will affect the accuracy and consistency of the final average power.

[0069] Therefore, in step S100, the power sampling period can be determined based on the input frequency of the power supply. In one feasible embodiment, after obtaining the input frequency of the power supply, a suitable power sampling period is dynamically determined based on this frequency information. The duration of this power sampling period covers an integer number of complete AC half-wave cycles to ensure the integrity and representativeness of the instantaneous power within each sampling period. In some examples, for instance, under a 50Hz power grid, one half-wave cycle is 10 milliseconds, and the sampling period can be set to multiple integer multiples of 10 milliseconds; while under a 60Hz power grid, the half-wave cycle is approximately 8.3 milliseconds, and the sampling period is adjusted accordingly to an integer multiple of this value. Therefore, step S100 can adaptively adjust the power sampling period according to changes in the input frequency, avoiding problems such as incomplete sampling waveforms and missing sampling points caused by changes in the input frequency, fundamentally improving the accuracy and consistency of the finally determined current power.

[0070] It is important to note that, such as Figure 3As shown, based on the framework of the electromagnetic heating device, namely the power input terminal, rectifier circuit 10, resonant circuit 20, and power switch 30 connected in sequence, obtaining the input frequency of the power supply for the electromagnetic heating device in step S100 can be either obtaining the voltage frequency of the output terminal of the rectifier circuit 10 or obtaining the voltage frequency of the collector terminal of the power switch 30, wherein the collector of the power switch 30 is connected to the output terminal of the resonant circuit 20. Alternatively, the voltage frequency of the mains power can be directly obtained at the power input terminal. The specific point of input frequency acquisition is not limited here and depends on the requirements of the actual circuit architecture.

[0071] The power sampling period, determined based on the input frequency, can be calculated using the following formula: ,in, This represents the input frequency, where N is any positive integer. It's understandable that, since... The result is the time length of two half-wave cycles, i.e., one complete AC cycle. Therefore, to ensure sufficient data acquisition within one or more complete half-wave cycles, the power sampling period should be set to an integer multiple of half a cycle to guarantee data integrity. In this way, regardless of changes in the input frequency, the power sampling period can be adjusted to the corresponding value, ensuring that each sample covers a complete and continuous half-wave cycle.

[0072] In this embodiment, step S200 involves determining the number of samplings and the sampling interval corresponding to the power sampling period based on the power sampling period.

[0073] It should be noted that the number of samplings corresponding to the power sampling period refers to the number of times sampling needs to be performed within the power sampling period. The sampling interval is the duration of each sampling interval. It should be noted that the duration of each sampling interval is the same, that is, the sampling interval is a fixed value, which depends on the power sampling period and the number of samplings.

[0074] Understandably, after determining the power sampling period, the number of samples and the sampling interval directly affect the accuracy of the final determined current power. Since the accuracy of calculating the current power of the electromagnetic heating equipment depends on the half-wave rectification characteristics of the AC power, its instantaneous power exhibits a non-linear change within a complete half-wave cycle. If only a small number of samples are taken or the sampling points are unevenly distributed, deviations in the current power sampling may occur. Therefore, to improve the accuracy and consistency of the final determined current power, it is essential to ensure a sufficient number of instantaneous power samples are taken within a complete power sampling period, while maintaining a uniform interval between sampling points.

[0075] It should be noted that the number of samples or the sampling interval are not strictly limited in practical applications. The setting of the number of samples and the sampling interval can take into account factors such as the MCU processing power and ADC conversion speed, to avoid overburdening the electromagnetic heating equipment due to excessively high sampling frequency or causing data loss due to excessively low sampling frequency. Optionally, the number of samples can be selected from 10 to 100 based on the input frequency. The sampling interval depends on the number of samples required in each power sampling cycle.

[0076] In this embodiment, step S300 involves sampling a corresponding number of instantaneous power values ​​during the power sampling period, based on the determined number of sampling times and sampling intervals.

[0077] It is understandable that instantaneous power reflects the real-time operating status of an electromagnetic heating device at a specific point in time, but it cannot directly represent the device's current power over the entire sampling period. By performing multiple samples within a preset power sampling period according to a specified number of samples and intervals, the trend of instantaneous power changes is comprehensively sampled. This lays the foundation for the final calculation of the average power, which can be regarded as the current power of the electromagnetic heating device.

[0078] In this embodiment, step S400, determining the average value of the corresponding number of instantaneous power samples, is the current power of the electromagnetic heating device.

[0079] Understandably, the average value of all instantaneous power obtained in step S300 is calculated as the current power of the electromagnetic heating device. Calculating the average value can smooth out instantaneous power fluctuations caused by power grid fluctuations or other factors, thereby providing an accurate and reliable calculation result of the current power.

[0080] Based on steps S100 to S400, in one feasible implementation, such as Figure 4As shown, the electromagnetic heating device is applied in a 50Hz power grid environment. In step S100, the detection circuit obtains the input frequency of the current power supply as 50Hz and determines the power sampling period to be 10 milliseconds. Next, based on the set power sampling period of 10 milliseconds, it is determined that the number of samples to be taken within this power sampling period is 10. The sampling points do not include the zero-crossing point. Therefore, the sampling interval is 10 milliseconds divided by the number of samples + 1, i.e., 10 + 1, which is a sampling interval of 0.909 milliseconds. This allows the sampling points to be evenly distributed within each half-wave cycle. Then, in step S300, the first sampling begins 0.909 milliseconds after the zero-crossing point, and sampling is performed every 0.909 milliseconds to sample 10 instantaneous power values. These 10 instantaneous power values ​​completely reflect the power changes of the electromagnetic heating device within a complete sampling period. Finally, these 10 instantaneous power values ​​are averaged to calculate a representative average power value, which is used as the current power of the electromagnetic heating device in its current operating state.

[0081] In summary, the power determination method for electromagnetic heating devices provided by this invention can improve the accuracy of the current power of the electromagnetic heating device. Based on this method, the input frequency of the power supply to the electromagnetic heating device is first obtained, and the power sampling period is dynamically determined according to this input frequency. Thus, when the input frequency changes, such as due to a change in the area of ​​use or fluctuations in the mains power, the power sampling period can be adaptively adjusted to ensure that at least one complete half-wave waveform with multiple instantaneous power values ​​is always collected within the power sampling period. The average power is then calculated based on these multiple instantaneous power values, and this average power is the current power of the electromagnetic heating device, i.e., the output power. Therefore, this method avoids the problems of incomplete sampling waveforms and missing sampling points caused by using a fixed power sampling period in the prior art, thus improving the accuracy and consistency of the current power.

[0082] In one embodiment, such as Figure 5 As shown, step S100, which determines the power sampling period based on the input frequency, also includes steps S110 and S120.

[0083] In this embodiment, step S110 involves determining the half-wave period corresponding to the input frequency.

[0084] Understandably, since electromagnetic heating equipment is connected to AC power, its voltage waveform exhibits a sinusoidal change, with a complete cycle consisting of two half-waves: a positive half-wave and a negative half-wave. Therefore, upon obtaining the input frequency, the first step is to calculate the corresponding complete cycle, and then further determine the corresponding half-wave period. For example, in a 50Hz power grid environment, the complete cycle is 20 milliseconds, corresponding to a half-wave period of 10 milliseconds; while in a 60Hz power grid environment, the complete cycle is approximately 16.7 milliseconds, corresponding to a half-wave period of approximately 8.3 milliseconds.

[0085] In this embodiment, step S120 involves configuring the first preset integer multiple of the half-wave period as the power sampling period.

[0086] It is understandable that using a first preset integer multiple of the half-wave period as the power sampling period ensures that each power sampling covers an integer number of complete half-wave periods, thereby avoiding the problem of errors in the current power due to incomplete sampling.

[0087] It should be noted that the specific value of the first preset integer multiple is not limited here and can be set according to different application scenarios.

[0088] Optionally, the first preset integer multiple is set to 1, meaning a complete half-wave cycle is used as the power sampling period. This improves the calculation speed of the current power while ensuring a certain level of accuracy in power sampling. In a 50Hz environment, the current power can be determined in 10 milliseconds, which is beneficial for applications requiring rapid adjustment of output power.

[0089] Combination Figure 2 It is understandable that waveform B consists of multiple half-waves, and the period occupied by one of the half-waves is the half-wave period mentioned above.

[0090] In one embodiment, such as Figure 6 As shown, step S200 also includes steps S210 and S220.

[0091] In this embodiment, step S210 involves determining the number of samplings corresponding to the power sampling period based on the time length of the power sampling period.

[0092] The duration of the power sampling period is positively correlated with the number of samples. This means that a longer power sampling period results in more samples, and a shorter period results in fewer samples. Optionally, the duration of the power sampling period and the number of samples are linearly positively correlated.

[0093] In one feasible implementation, since the power sampling period is an integer number of half-wave cycles, it is only necessary to preset the number of samples required within one half-wave cycle. Then, the number of samples corresponding to the power sampling period can be determined based on a specific value that is a first preset integer multiple. It is also understood that although the mains frequency connected to the electromagnetic heating device may vary due to different regions or grid fluctuations, in this embodiment, the number of samples set for one half-wave cycle can remain constant. This is because if uniform sampling is used within one half-wave cycle, regardless of changes in the input frequency, as long as the sampling points are evenly distributed and the number of samples is consistent, the calculation result of the average power will not be affected. Therefore, a corresponding number of samples can be set for one half-wave cycle, allowing the system to determine the specific number of samples required based on the number of half-wave cycles in the power sampling period.

[0094] In this embodiment, step S220 involves determining the sampling interval corresponding to the power sampling period based on the time length of the power sampling period and the determined number of samplings.

[0095] Optionally, if the power sampling period is 10 milliseconds and the number of samplings is 10, then all 10 samples fall within the two endpoints, which also divides the entire power sampling period into 11 equal parts. Therefore, the sampling interval is 10 milliseconds / 11, which is approximately 0.909 milliseconds.

[0096] Optionally, if the sampling point includes a zero point, and the power sampling period is 10 milliseconds with 10 sampling times, the first sampling point is located at the beginning of the period (i.e., 0 milliseconds), and the remaining 9 sampling points are evenly distributed across subsequent time points, dividing the entire sampling period into 9 equal parts. In this case, the sampling interval is 10 milliseconds / 10, which equals 1 millisecond. The last sampling point is located at an interval before the next power sampling period. It should be noted that each power sampling period contains only one zero-point sampling point, and sampling points will not be counted repeatedly between adjacent periods. For example, of the 10 sampling points in the previous power sampling period, only the first one falls at the zero point at the beginning of its period; while the sampling point closest to the zero point of the current period (i.e., the sampling point at the end of the previous period) should be included in the sampling count of the current power sampling period, thus ensuring the continuity and consistency of the sampling data.

[0097] Optionally, if the first preset integer multiple is greater than 1 and the sampling points do not include zero points, and the power sampling period is 10 milliseconds with 10 sampling times, then all 10 samples fall within the two endpoints. In this case, the entire power sampling period is divided into 11 equal parts. Therefore, the sampling interval is 10 milliseconds / 11, which is approximately 0.909 milliseconds. Since the power sampling period consists of half-wave periods that are multiples of the first preset integer multiple, and this first preset integer multiple is greater than 1, a complete sampling period contains multiple consecutive half-wave periods. In this case, at the beginning of each half-wave period, a sampling interval of 0.909 milliseconds is waited before sampling begins sequentially at the set intervals. It is particularly important to note that at the endpoints between two half-wave periods, the interval between the corresponding consecutive samplings is two sampling intervals, approximately 1.818 milliseconds.

[0098] It is understandable that the specific method for determining the sampling interval and the form of sampling are not limited here, and can be determined according to the needs of the actual application.

[0099] In one embodiment, step S200 can be further defined as step S230. In this embodiment, step S230 involves determining the sampling interval corresponding to the power sampling period based on the input frequency, and determining the number of samplings corresponding to the power sampling period based on the power sampling period and the sampling interval.

[0100] It is understandable that step S230 is to calculate the number of samples based on the sampling interval, and steps S210 and S220 are to calculate the sampling interval based on the number of samples.

[0101] In all of these steps, including S230, S210, and S220, the sampling density remains constant. The higher the sampling density, the more accurate the average calculation, which means the more accurate the final determined current power. The sampling density can be preset before determining the number of samples and the sampling interval.

[0102] It's important to explain that a shorter sampling interval is preferable for higher input signal frequencies, while a longer sampling interval is preferable for lower frequencies. Higher input frequencies mean shorter half-wave periods, thus requiring shorter sampling intervals to capture a sufficient amount of instantaneous power, including power at critical locations. Conversely, lower input frequencies mean longer half-wave periods, requiring longer sampling intervals to avoid sampling excessive instantaneous power and increasing the workload on the system processor. Next, based on the selected sampling interval and the known power sampling period length, the number of samples can be calculated. The formula used here is: Number of samples = Power sampling period / Sampling interval.

[0103] In one embodiment, such as Figure 7 As shown, the power determination method for the electromagnetic heating device further includes steps S510 and S520.

[0104] In this embodiment, step S510 involves obtaining the zero-crossing point of the power supply for the electromagnetic heating device.

[0105] In this embodiment, step S520 involves sampling the instantaneous power after a first delay based on the zero-crossing point of the power supply of the electromagnetic heating device, where the first delay is equal to the duration corresponding to the sampling interval.

[0106] It's understandable that the zero-crossing point of the power supply for electromagnetic heating equipment refers to the instant when the AC mains power transitions from the positive half-cycle to the negative half-cycle or vice versa, at which point the voltage value passes zero. Similarly, the half-wave period refers to the time interval between one zero-crossing point and the next, corresponding to the duration of half a sine wave. It's important to note that sampling is performed after a first-time delay following the detection of the AC mains zero-crossing point. This means that sampling is not performed at the zero-crossing point itself; that is, sampling is not performed at the beginning or end of the power sampling period. Instead, sampling occurs only after the first time interval has elapsed. This avoids sampling at the zero-crossing point, which could result in invalid instantaneous power samples, affecting the accuracy and consistency of subsequent average power calculations.

[0107] It is worth noting that the zero-crossing point of the power supply for the electromagnetic heating device can be either the zero-crossing point of the voltage value after passing through the rectifier circuit 10, i.e., the zero-crossing point of the voltage value at the output terminal of the rectifier circuit 10; or it can be the zero-crossing point of the voltage value at the collector of the power switch 30. The voltage values ​​at these two points will, after the switch drive circuit 40 drives the power switch 30, exhibit the following characteristics: Figure 2 The B waveform shown also exhibits a zero-crossing point, which is actually the same as the zero-crossing point of the power supply (i.e., Figure 2 (corresponding to waveform A in the text).

[0108] In one embodiment, such as Figure 8 As shown, step S300 also includes steps S310 and S320.

[0109] In this embodiment, step S310 involves sampling the corresponding number of input currents and input voltages during the power sampling period, based on a determined number of sampling times and sampling intervals.

[0110] It is understood that step S300 samples the corresponding instantaneous power; however, this instantaneous power is actually ultimately determined based on the sampled input current and input voltage. Therefore, in step S310, the input current and input voltage are sampled. In one feasible implementation, the power sampling period is 10 milliseconds, which corresponds to one half-wave cycle of 50Hz. Based on the determined number of samplings and sampling interval, a corresponding number of input current and input voltage values ​​are collected. That is, if the number of samplings is 10, then the current and voltage values ​​at 10 sampling points will be sampled, resulting in a total of 10 sets of current and voltage values. These 10 sets of current and voltage values ​​constitute the trajectory of the input current and input voltage changes throughout the entire sampling period. Thus, the instantaneous power calculated subsequently is more representative, ultimately improving the accuracy and consistency of the final determined current power.

[0111] It is important to note that, such as Figure 3 As shown, based on the framework of the electromagnetic heating device, namely the power input terminal, rectifier circuit 10, resonant circuit 20, and power switch 30 connected in sequence, the input current and input voltage are sampled. This can be done by obtaining the voltage and current at the output terminal of the rectifier circuit 10, or by obtaining the voltage and current at the collector terminal of the power switch 30, where the collector of the power switch 30 is connected to the output terminal of the resonant circuit 20. It is also worth noting that since the voltage and current at the power input terminal are stable waveforms, they cannot reflect the current power of the electromagnetic heating device; that is, the mains input voltage and current cannot be directly obtained at the power input terminal.

[0112] In this embodiment, step S320 involves determining the corresponding number of instantaneous powers based on the corresponding number of input currents and input voltages.

[0113] It is understandable that, based on the input current and input voltage collected in step S310, and based on the instantaneous power calculation formula: Instantaneous Power = Input Voltage Value Input current value. That is, at each sampling point, the system processor calculates an instantaneous power value, until the input current value and input voltage value sampled at all sampling points have been calculated into the corresponding instantaneous power value. By calculating the average of these several instantaneous power values, the current power can be obtained.

[0114] It should also be noted that in all the above embodiments, and indeed throughout the entire text, when sampling instantaneous power, one should think of the corresponding input current and input voltage values, and finally calculate the instantaneous power based on the sampled input current and input voltage values.

[0115] The power determination method for the electromagnetic heating device described above only involves the calculation step of the current power in the electromagnetic heating device. However, the present invention also provides a control method for the electromagnetic heating device, which is a control algorithm based on the current power of the electromagnetic heating device.

[0116] In one embodiment, such as Figure 9 As shown, the control method of the electromagnetic heating device includes steps S600 to S800.

[0117] In this embodiment, step S600 involves determining the current power of the electromagnetic heating device according to the power determination method for electromagnetic heating devices.

[0118] It is understood that the current power can be obtained by the power determination method proposed in this invention, which specifically includes sampling the input voltage and input current at multiple points within a power sampling period determined according to the input frequency, calculating the instantaneous power point by point based on these sampled values, and finally obtaining the current power by averaging or integration.

[0119] Since the current power of the electromagnetic heating device reflects its current energy consumption status, it can serve as a key basis for subsequent intelligent control and power regulation.

[0120] It should be noted that, unless otherwise specified, all the current power mentioned in the control method of the electromagnetic heating device is calculated by the power determination method of the electromagnetic heating device of the present invention. The specific calculation process is as described in the above embodiments. Therefore, the control method of the electromagnetic heating device can at least achieve the beneficial effects of the power determination method of the electromagnetic heating device in the above embodiments, which will not be elaborated here.

[0121] In this embodiment, step S700 is to determine the target power of the electromagnetic heating device.

[0122] It is understandable that the target power refers to the ideal operating power value set by the user or automatically set by the system according to the working status, representing the heating intensity or energy output level that the electromagnetic heating equipment is expected to achieve.

[0123] It is understandable that there are multiple ways to determine the target power, such as selection by the user through the control panel, automatic adjustment based on a preset program, or dynamic adjustment based on the temperature of the heated object fed back by a temperature sensor. It is also important to note that the target power can be a dynamically changing parameter, depending on the application scenario and conditions of the electromagnetic heating equipment.

[0124] In this embodiment, step S800 involves adjusting the operating power of the electromagnetic heating device based on the difference between the current power and the target power, so that the current power approaches the target power.

[0125] Understandably, the control system of electromagnetic heating equipment analyzes the deviation between the current power and the target power to determine or calculate the required power increment or decrement, and adjusts the output power of the electromagnetic heating equipment accordingly. By continuously narrowing the gap between the current power and the target power, the system achieves precise control of the heating process, improving overall heating efficiency and user experience.

[0126] Working power emphasizes the equipment's ability to perform external work, representing the desired ideal output; while current power refers to the equipment's current actual energy consumption, reflecting its actual operating status.

[0127] Optionally, the operating power of the electromagnetic heating device can be adjusted by regulating the duty cycle of the drive signal of its power switch 30. The duty cycle refers to the proportion of time that is high-level within a cycle. Increasing the duty cycle increases the on-time per cycle, thereby increasing the average operating power; conversely, decreasing the duty cycle will reduce the operating power.

[0128] It is understandable that incorporating the current power obtained from the power determination method proposed in this invention into the control process of the electromagnetic heating device can make the control process faster and more accurate. Firstly, greater accuracy refers to the higher accuracy of current power sampling and calculation, avoiding errors in current power determination caused by inaccurate current power in existing technologies, thus providing a more reliable reference value for control. Secondly, faster control means that the processor system of the electromagnetic heating device can sample the current power more quickly. For example, when the power sampling period is one half-wave cycle, it only takes 10 milliseconds to sample the accurate current power, avoiding the problem of slow average power sampling speed caused by traditional fixed long periods, and also avoiding the long delay required for the control system of the electromagnetic heating device to take corresponding measures after the user sets the target power. Therefore, this control method, using the current power sampled by the aforementioned power determination method, can complete the corresponding judgment and control in a short time, possessing faster adjustment capabilities.

[0129] In one embodiment, such as Figure 10 As shown, step S800 further includes steps S810 and S820.

[0130] In this embodiment, step S810 involves determining the power adjustment range based on the difference between the current power and the target power.

[0131] The power adjustment amplitude is positively correlated with the difference between the current power and the target power.

[0132] In this embodiment, step S820 involves adjusting the operating power of the electromagnetic heating device according to the power adjustment amplitude, so that the current power approaches the target power.

[0133] Optionally, the power adjustment amplitude varies proportionally to the ratio between the current power and the target power. That is, when the ratio is close to 1, the electromagnetic heating device is already at or very close to its ideal operating state. At this time, a smaller power adjustment amplitude should be used to adjust the operating power to avoid over-adjustment and fluctuations. Conversely, if the ratio deviates significantly from 1, the power adjustment amplitude needs to be increased to more quickly narrow the gap between the two and allow the electromagnetic heating device to rapidly return to operation near the target power.

[0134] Understandably, adjusting the operating power of the electromagnetic heating equipment based on the power adjustment range aims to ensure that the difference between the current power and the preset target power is less than a set first power preset threshold. In other words, the control system will gradually decrease or increase the operating power based on the calculated power adjustment range to adjust the current power and reduce the gap between the current power and the user-set target power until the accuracy requirements are met. It should be noted that the first power preset threshold can be 10W, 20W, or 30W; the specific value is not limited here and can be determined based on the application scenario.

[0135] It is also understandable that in some exemplary control methods, the operating power is adjusted by a fixed amplitude, which causes the current power of the electromagnetic heating device to fluctuate repeatedly around the target power. Therefore, this control method can determine the power adjustment amplitude based on the difference between the current power and the target power, i.e., the power adjustment amplitude is a dynamic value, thus effectively avoiding the current power of the electromagnetic heating device from fluctuating repeatedly around the target power.

[0136] In one feasible implementation, if the ratio of target power to average power is 0.4, it indicates that the current average power is significantly higher than the target power. The control system will increase the power adjustment range according to the proportional relationship to quickly reduce the operating power and make the average power approach the target power rapidly. If the ratio of target power to average power is 0.8, it indicates that the current average power is slightly higher than the target power. At this time, the system will use a smaller power adjustment range to make more precise adjustments and avoid fluctuations caused by excessively rapid adjustments. If the ratio of target power to average power is 1.4, it indicates that the current average power is lower than the target power. The control system will increase the power adjustment range to accelerate the power increase speed, thereby quickly narrowing the gap and stabilizing near the target power.

[0137] In one embodiment, such as Figure 11As shown, the control method for the electromagnetic heating device also includes steps S911 and S912.

[0138] In this embodiment, step S911 is to obtain the pot-moving power threshold.

[0139] In this embodiment, step S912 involves determining that a pot has been moved when the current power is less than the pot-moving power threshold, and controlling the power switch 30 of the electromagnetic heating device to stop working.

[0140] Moving the pot refers to the relative displacement between the pot and the main body of the electromagnetic heating device.

[0141] Understandably, the pan-moving power threshold is used to identify power fluctuations caused by user operations, such as moving or tossing the pan. The specific value of the pan-moving power threshold is not limited here. It can be set based on the target power and / or the current power, or it can be dynamically adjusted based on the target power and / or the current power. It is not limited here for the time being.

[0142] In one feasible implementation, the electromagnetic heating device first operates in a high-power cooking mode, with the target power set at 1500W and the pot-moving power threshold set at 500W. If the calculated current power is 450W, which is less than the pot-moving power threshold, it is determined that the pot has been moved. However, if the current power is 1000W, which is greater than the pot-moving power threshold, it is determined that the pot has not been moved.

[0143] It should be noted that due to the fast sampling speed of the current power, changes in the current power can be quickly detected when the user moves or tosses the pot. This allows for a faster comparison with the pot-moving power threshold to determine whether the pot should be moved. In this way, timely adjustments can be made to avoid unnecessary hardware damage, ultimately extending the lifespan of the equipment.

[0144] It is important to note that if the electromagnetic heating system remains operational after the cookware is removed, the coil in the resonant circuit 20 will continue to generate a high-frequency alternating magnetic field. This magnetic field cannot effectively couple to the metal cookware, leading to increased energy reflection, higher coil temperature, and a heavier load on the inverter circuit. This could potentially cause overheating, component aging, or even damage. Therefore, the power switch 30 must be stopped after the cookware is removed to halt the generation of the high-frequency alternating magnetic field.

[0145] It's worth noting that the step of detecting pot displacement and pausing the power switch 30 of the electromagnetic heating device doesn't have to be triggered instantly. In other words, the power switch 30 doesn't pause immediately upon pot displacement. Optionally, a time-based judgment can be inserted between the pot displacement and the pausing of the power switch 30. For example, after the pot displacement occurs and a preset time has elapsed, the power switch 30 can be paused. This avoids misjudgments caused by power fluctuations affecting the operation of the power switch 30, thus improving the stability of the electromagnetic heating device.

[0146] Based on steps S911 to S912, in one embodiment, the pot-moving power threshold is a dynamic pot-moving power threshold, and as shown in the figure. Figure 12 As shown, in this embodiment, step S911 further includes steps S9111 and S9112.

[0147] In this embodiment, step S9111 involves updating the pot-moving power threshold to the power value corresponding to the target power when the current power is not less than the target power.

[0148] In this embodiment, step S9112, when the current power is less than the target power and the current power is greater than the pot-moving power threshold, updates the pot-moving power threshold to the power value corresponding to the current power.

[0149] If the current power is not less than the target power, the pot-moving power threshold is updated to the power value corresponding to the target power. This way, the pot-moving detection logic will not misjudge pot movement due to power fluctuations at high power levels. When the electromagnetic heating device is in a high-power state, its current power exceeds the user-set target power. If the current power is used as the pot-moving power threshold, it is easy to judge as pot movement when the power naturally decreases due to high power fluctuations. Therefore, by directly setting the pot-moving power threshold to the power value corresponding to the target power, the pot-moving detection is only likely to be determined when the current power naturally decreases to the target power and then further decreases.

[0150] Optionally, when the current power reaches or exceeds the target power, the pot-moving power threshold is fixed at the target power. That is, pot-moving detection is only triggered when the power is significantly lower than the target power. For example, if the target power is 1500W and the current power is 1550W, the system sets the pot-moving power threshold to 1500W. This effectively addresses misjudgments caused by a natural decrease in current power. Conversely, if the current power is 1550W, the pot-moving power threshold is 1500W, and the target power is 1450W, then when the current power decreases from 1550W to 1450W, pot-moving might not occur. However, since the pot-moving power threshold is 1500W, the system might incorrectly determine that pot-moving has occurred, thus failing to effectively extend the lifespan of the electromagnetic heating equipment.

[0151] Additionally, it should be noted that when directly setting the target power as the pot-moving power threshold, a difference judgment can be added to determine whether to move the pot. For example, when the current power and the pot-moving power threshold reach a certain percentage, it is determined to move the pot, such as 20%. In this way, misjudgments caused by normal power fluctuations can be avoided.

[0152] Understandably, when the current power is less than the target power but higher than the current pot-moving power threshold, the pot-moving power threshold is updated to the power value corresponding to the current power. In some examples, if the target power is 1000W and the initial pot-moving power threshold is 500W, when the current power drops to 350W, the system needs to simultaneously lower the pot-moving power threshold to 350W to avoid failing to detect subsequent small power changes due to an excessively high threshold. This also avoids misjudgments caused by poor cookware, where the current power remains below the pot-moving power threshold. Similarly, in some examples, the pot-moving power threshold is 700W. If the current power increases from 700W to 750W (still below the target power), the system adjusts the threshold to 750W. This ensures reasonable judgment logic throughout the entire power fluctuation range; otherwise, a "judgment gap" would appear between 750W and the target power. This allows for adaptive behavior to user actions.

[0153] Additionally, it should be noted that when directly setting the current power as the pot-moving power threshold, a difference judgment can be added to determine whether to move the pot. For example, when the current power and the pot-moving power threshold reach a certain percentage, it is determined to move the pot, such as 20%, to avoid misjudgment caused by normal power fluctuations.

[0154] In summary, pot movement occurs in many scenarios. By utilizing the power determination method of this approach to obtain the current power, the detection speed of pot movement can be effectively improved, thereby enhancing the control efficiency of the corresponding pot movement control method, preventing a decrease in the service life of electromagnetic heating equipment, and ultimately improving the user experience.

[0155] In one embodiment, such as Figure 13 As shown, the control method of the electromagnetic heating device further includes steps S921 and S922.

[0156] In this embodiment, step S921 involves controlling the electromagnetic heating device to enter frequency dithering mode.

[0157] In this embodiment, step S922 involves determining the frequency dithering amplitude based on the difference between the current power and the minimum operating power, and controlling the power switch 30 of the electromagnetic heating device to perform frequency dithering operation according to the frequency dithering amplitude.

[0158] Understandably, during the operation of electromagnetic heating equipment, the high-frequency switching of power switch 30 generates strong electromagnetic interference. To reduce electromagnetic interference, frequency dithering control technology is usually used, which dynamically adjusts the operating frequency of power switch 30 near the peak value of the input voltage waveform, dispersing the interference energy originally concentrated at a fixed frequency point to a wider frequency band, thereby effectively suppressing electromagnetic interference.

[0159] Therefore, in step S921, when the electromagnetic heating device has high electromagnetic interference, the frequency dithering mode needs to be turned on to reduce the corresponding electromagnetic interference.

[0160] In step S922, the specific frequency dithering amplitude required by the electromagnetic heating device in the frequency dithering mode can be determined. A larger difference between the current power and the lowest continuous power indicates that the system is operating at a higher power; conversely, a smaller difference indicates that the system is operating at a lower power. This means that the frequency dithering amplitude can be dynamically adjusted with power. At high power, the frequency dithering amplitude is larger, which can more effectively diffuse electromagnetic interference energy; while at low power, the frequency dithering range automatically narrows to avoid output fluctuations or signal loss due to excessive amplitude, thereby ensuring the operational stability of the battery heating device.

[0161] In one embodiment, the dithering amplitude can be determined by dividing the difference between the current power and the lowest continuous power by a preset amplitude coefficient. It should be noted that dividing the difference by a preset amplitude coefficient essentially normalizes or scales the difference, thereby converting it into a dithering amplitude suitable for the current load conditions. It is understood that this preset amplitude coefficient can be a constant determined experimentally, and is not specifically limited here. This preset amplitude coefficient is mainly used to adjust the sensitivity of the dithering amplitude to power changes.

[0162] Thus, given the high accuracy and consistency of the current power and the fast determination speed, the electromagnetic heating equipment, in frequency dithering mode, can more accurately and quickly determine the required frequency dithering amplitude. This allows for more precise and faster suppression of electromagnetic interference during frequency dithering.

[0163] The present invention also provides a control device for implementing the power determination method of the electromagnetic heating device as described in any of the above claims, and / or, the control device for implementing the control method of the electromagnetic heating device as described in any of the above claims.

[0164] It should be noted that this control device can implement the power determination and control methods for the electromagnetic heating equipment described above, improve the sampling accuracy and consistency of the current power of the electromagnetic heating equipment, and also improve the response speed and accuracy of the logic control. Compared with the prior art, the beneficial effects of the control device provided by this invention are the same as those of the power determination and control methods for the electromagnetic heating equipment provided in the above embodiments, and will not be repeated here.

[0165] The present invention also proposes an electromagnetic heating device, which includes a control device. The specific technical features and beneficial effects of the control device are described in the above embodiments. Since the electromagnetic heating device 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.

[0166] The electromagnetic heating equipment can be one of the following: induction cooker, induction stove, induction kettle, induction steam oven, industrial electromagnetic heater, electromagnetic water heater, etc. The specific electromagnetic heating equipment is not limited here.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no technical conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for determining the power of an electromagnetic heating device, characterized in that, The method for determining the power of the electromagnetic heating device includes: Obtain the input frequency of the power supply for the electromagnetic heating device, and determine the power sampling period based on the input frequency; Based on the power sampling period, determine the number of samplings and the sampling interval corresponding to the power sampling period; During the power sampling period, a corresponding number of instantaneous power samples are taken based on the determined number of sampling times and sampling intervals. The average value of the corresponding number of instantaneous power samples is determined as the current power of the electromagnetic heating device; Determining the power sampling period based on the input frequency includes: Determine the half-wave period corresponding to the input frequency; Configure the half-wave period, which is a first preset integer multiple, as the power sampling period; The step of determining the number of samplings and the sampling interval corresponding to the power sampling period based on the power sampling period includes: Based on the duration of the power sampling period, the number of samplings corresponding to the power sampling period is determined; wherein, the duration of the power sampling period is positively correlated with the number of samplings. Based on the duration of the power sampling period and the determined number of samplings, a sampling interval corresponding to the power sampling period is determined; The method for determining the power of the electromagnetic heating device also includes: To obtain the zero-crossing point of the power supply for the electromagnetic heating equipment; Based on the zero-crossing point of the power supply of the electromagnetic heating device, the instantaneous power is sampled after a first delay, where the first delay is equal to the duration corresponding to the sampling interval.

2. The power determination method for the electromagnetic heating device as described in claim 1, characterized in that, The instantaneous power sampled during the power sampling period, based on the determined number of sampling times and sampling intervals, includes: During the power sampling period, a corresponding number of input currents and input voltages are sampled at a defined number of sampling times and sampling intervals. The instantaneous power of a corresponding number is determined based on the corresponding number of input currents and input voltages.

3. A control method for an electromagnetic heating device, characterized in that, The control method for the electromagnetic heating device includes: The current power of the electromagnetic heating device is determined according to the power determination method of the electromagnetic heating device as described in any one of claims 1 to 2. Determine the target power of the electromagnetic heating equipment; The operating power of the electromagnetic heating device is adjusted based on the difference between the current power and the target power, so that the current power approaches the target power.

4. The control method for the electromagnetic heating device as described in claim 3, characterized in that, The step of adjusting the operating power of the electromagnetic heating device based on the difference between the current power and the target power, so that the current power approaches the target power, includes: The power adjustment amplitude is determined based on the difference between the current power and the target power; wherein the power adjustment amplitude is positively correlated with the difference between the current power and the target power. The operating power of the electromagnetic heating device is adjusted according to the power adjustment range so that the current power approaches the target power.

5. The control method for the electromagnetic heating device as described in claim 3 or 4, characterized in that, The control methods for electromagnetic heating equipment also include: Obtain the power threshold for moving the pot; When the current power is less than the pot-moving power threshold, it is determined that pot-moving has occurred, and the power switch of the electromagnetic heating device is controlled to stop working.

6. The control method for the electromagnetic heating device as described in claim 5, characterized in that, The pot-moving power threshold is a dynamic pot-moving power threshold, and the process of obtaining the pot-moving power threshold includes: If the current power is not less than the target power, the pot-moving power threshold is updated to the power value corresponding to the target power; If the current power is less than the target power and the current power is greater than the pot-moving power threshold, the pot-moving power threshold is updated to the power value corresponding to the current power.

7. The control method for the electromagnetic heating device as described in claim 3 or 4, characterized in that, The control method for the electromagnetic heating device also includes: The electromagnetic heating device is controlled to enter frequency dithering mode; Based on the difference between the current power and the minimum operating power, the frequency dithering amplitude is determined, and the power switch of the electromagnetic heating device is controlled to dither according to the frequency dithering amplitude.

8. A control device, characterized in that, The control device is used to implement the power determination method of the electromagnetic heating device as described in any one of claims 1 to 2, and / or the control device is used to implement the control method of the electromagnetic heating device as described in any one of claims 3 to 7.

9. An electromagnetic heating device, characterized in that, The electromagnetic heating device includes the control device as described in claim 8.

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