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

Abstract

The invention discloses electromagnetic heating equipment and a power determination method, a control method and a control device thereof, and relates to the technical field of electromagnetic heating equipment.The power determination method of the electromagnetic heating equipment comprises the steps that the input frequency of a power supply of the electromagnetic heating equipment is acquired, and a power sampling period is determined according to the input frequency; determining a sampling frequency and a sampling interval corresponding to the power sampling period according to the power sampling period; in the power sampling period, sampling the instantaneous power of the corresponding number according to the determined sampling times and sampling intervals; and determining the average value of the corresponding number of sampled instantaneous powers as the current power of the electromagnetic heating equipment. The power determination method provided by the invention aims to improve the accuracy of the current power of the electromagnetic heating equipment.

Description

Technical Field

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

[0002] Electromagnetic heating devices have the advantages of high heating efficiency and convenient use, and are gradually replacing traditional gas heating devices. However, the current power sampling method of existing electromagnetic heating devices is relatively single, and it is difficult to adapt to the grid differences in different regions or the unstable situation of mains input. Therefore, when determining the current power, errors are likely to occur, resulting in inaccurate current power. Summary of the Invention

[0003] The main object of the present invention is to propose an electromagnetic heating device, a power determination method, a control method, and a control device thereof, aiming to improve the sampling accuracy of the current power of the electromagnetic heating device.

[0004] To achieve the above object, the power determination method of the electromagnetic heating device proposed by the present invention includes: Obtaining the input frequency of the power supply of the electromagnetic heating device, and determining a power sampling period according to the input frequency; Determining the sampling times and sampling intervals corresponding to the power sampling period according to the power sampling period; Sampling the corresponding number of instantaneous powers at the determined sampling times and sampling intervals during the power sampling period; Determining the average value of the corresponding number of the sampled instantaneous powers as the current power of the electromagnetic heating device.

[0005] In an embodiment, the determining the power sampling period according to the input frequency includes: Determining the half-wave period corresponding to the input frequency; Configuring the half-wave period of a first preset integral multiple as the power sampling period.

[0006] In an embodiment, the determining the sampling times and sampling intervals corresponding to the power sampling period according to the power sampling period includes: Determining the sampling times corresponding to the power sampling period according to the time length of the power sampling period; wherein, the time length of the power sampling period is positively correlated with the sampling times; Determining the sampling intervals corresponding to the power sampling period according to the time length of the power sampling period and the determined sampling times.

[0007] In an embodiment, the power determination method of the electromagnetic heating device further includes: Obtain the zero-crossing point of the power supply for the electromagnetic heating device; According to the zero-crossing point of the power supply for the electromagnetic heating device, after delaying for a first duration, sample the instantaneous power, where the first duration is equal to the duration corresponding to the sampling interval.

[0008] In one embodiment, the sampling of the corresponding number of instantaneous powers at the determined number of sampling times and sampling interval during the power sampling period includes: During the power sampling period, sample the corresponding number of input currents and input voltages at the determined number of sampling times and sampling interval; Determine the corresponding number of instantaneous powers according to the corresponding number of the input currents and input voltages.

[0009] The present invention also provides a control method for an electromagnetic heating device, and the control method for the electromagnetic heating device includes: Determine the current power of the electromagnetic heating device according to the power determination method of the electromagnetic heating device as described in any one of the above; Determine the target power of the electromagnetic heating device; According to the difference between the current power and the target power, adjust the working power of the electromagnetic heating device so that the current power approaches the target power.

[0010] In one embodiment, the adjusting the working power of the electromagnetic heating device according to the difference between the current power and the target power so that the current power approaches the target power includes: Determine the power adjustment amplitude according to 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; Adjust the working power of the electromagnetic heating device according to the power adjustment amplitude so that the current power approaches the target power.

[0011] In one embodiment, the control method for the electromagnetic heating device further includes: Obtain the power threshold for pot removal; When the current power is less than the power threshold for pot removal, determine that pot removal has occurred, and control the power switch of the electromagnetic heating device to suspend operation.

[0012] In one embodiment, the power threshold for pot removal is a dynamic power threshold for pot removal, and the obtaining of the power threshold for pot removal includes: When the current power is not less than the target power, update the power threshold for pot removal to the power value corresponding to the target power; When the current power is less than the target power and the current power is greater than the power threshold for pot removal, update the power threshold for pot removal to the power value corresponding to the current current power.

[0013] In one embodiment, the control method of the electromagnetic heating device further includes: Controlling the electromagnetic heating device to enter a frequency jitter mode; Determining a frequency jitter amplitude according to the difference between the current power and the minimum operating power, and controlling the power switch of the electromagnetic heating device to perform frequency jitter operation according to the frequency jitter amplitude.

[0014] The present invention also provides a control device, which is used to implement the power determination method of the electromagnetic heating device as described in any one of the above, and / or, the control device is used to implement the control method of the electromagnetic heating device as described in any one of the above.

[0015] The present invention also provides an electromagnetic heating device, which includes the control device as described above.

[0016] In summary, the power determination method of the electromagnetic heating device provided by the present invention can improve the accuracy of the current power of the electromagnetic heating device. Based on this method, first obtain the input frequency of the power supply of the electromagnetic heating device, and dynamically determine the power sampling period according to this input frequency. In this way, when the input frequency changes, such as changing the usage area or the power grid fluctuates, the power sampling period can be adjusted adaptively to ensure that at least one complete half-wave waveform of multiple representative instantaneous power values can be collected within the power sampling period, and the average power is calculated based on multiple instantaneous power values. This average power is the current power of the electromagnetic heating device, that is, the output power. In this way, this method avoids problems such as incomplete sampling waveforms and missing sampling points caused by using a fixed power sampling period in the prior art, and improves the accuracy and consistency of the finally determined current power. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0018] Figure 1 It is a flowchart of the first embodiment of the power determination method of the electromagnetic heating device provided by the present invention; Figure 2 It is a voltage waveform diagram before and after rectification of the power supply; Figure 3 It is a circuit diagram of an embodiment of the electromagnetic heating device provided by the present invention; Figure 4Sampling schematic waveform diagram of the power determination method for the electromagnetic heating device provided by the present invention; Figure 5 Flowchart of the second embodiment of the power determination method for the electromagnetic heating device provided by the present invention; Figure 6 Flowchart of the third embodiment of the power determination method for the electromagnetic heating device provided by the present invention; Figure 7 Flowchart of the fourth embodiment of the power determination method for the electromagnetic heating device provided by the present invention; Figure 8 Flowchart of the fifth embodiment of the power determination method for the electromagnetic heating device provided by the present invention; Figure 9 Flowchart of the first embodiment of the control method for the electromagnetic heating device provided by the present invention; Figure 10 Flowchart of the second embodiment of the control method for the electromagnetic heating device provided by the present invention; Figure 11 Flowchart of the third embodiment of the control method for the electromagnetic heating device provided by the present invention; Figure 12 Flowchart of the fourth embodiment of the control method for the electromagnetic heating device provided by the present invention; Figure 13 Flowchart of the fifth embodiment of the control method for the electromagnetic heating device provided by the present invention.

[0019] Explanation of the reference numerals in the drawings: 10. Rectifier circuit; 20. Resonant circuit; 30. Power switch; 40. Switch drive circuit.

[0020] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] It should be noted that in this article, step codes such as S100, S200, etc. are used. The purpose is to more clearly and briefly express the corresponding content and do not constitute a substantial limitation in the order. Those skilled in the art may execute S200 first and then S100 during specific implementation, etc., but these should all be within the protection scope of the present invention.

[0023] Electromagnetic heating devices are widely used in household kitchen appliances. They are heating devices that achieve energy conversion based on the principle of electromagnetic induction. It can be understood that, taking an induction cooker as an example, the basic working principle of an induction cooker is to convert the mains power into high-frequency alternating current through an internal high-frequency inverter circuit after rectification, and generate an alternating magnetic field in the heating coil to act on a magnetic conductive cookware, inducing eddy currents on the surface of the cookware, thereby generating Joule heat to achieve the heating effect. It should be noted that due to the advantages of high heating efficiency and easy cleaning of electromagnetic heating devices such as induction cookers, electromagnetic heating devices have been rapidly popularized and widely used globally. At this time, if manufacturers of electromagnetic heating devices want to regard various regions around the world as the target markets for their electromagnetic heating devices, they need to configure the production of electromagnetic heating devices to be able to adapt to different mains power in various regions of the world. That is, even when the input mains power is different, the reliability and stability of their operation need to be ensured.

[0024] However, existing electromagnetic heating devices have certain limitations in actual use, especially in power control, resulting in the inability of existing electromagnetic heating devices to be applied in different countries and regions, or the inability of existing electromagnetic heating devices to cope with the situation of input frequency fluctuations, thereby making the currently determined current power of the electromagnetic heating device inaccurate and with low consistency. The following explains its limitations based on some exemplary electromagnetic heating devices. The electromagnetic heating devices in the examples use a fixed frequency for AD sampling to calculate the input power, that is, sampling the voltage and current signals at a preset time interval, and calculating the current power based on these sampled voltage and current signals. For example, instantaneous power is sampled every 5 seconds as a power sampling period, and the sampled instantaneous power is averaged to determine the average power or the current power. It should be noted that although this calculation method has high stability at some fixed input frequencies and can accurately reflect the actual current power under a stable grid environment. However, when the above fixed sampling method is applied to a scenario with grid frequency fluctuations or to different countries and regions, the power sampling is inaccurate and the consistency is poor. The reason is that since the mains power is alternating current, using a fixed sampling duration cannot adapt to the changes in the alternating current waveform, resulting in the possibility of missing or misplacing sampling points within a complete half-wave or full-wave signal for different alternating current waveforms, thus causing errors in the current power sampling. Therefore, for existing electromagnetic heating devices in the above scenarios or conditions, the current power calculation error is large, and the effectiveness and accuracy of the power control algorithm are low.

[0025] It should be noted that the current power is inaccurate and has poor consistency, which will not only affect the output power stability of the electromagnetic heating device, but also affect the effectiveness and accuracy of many power control algorithms. In some examples, the control device can adjust the duty cycle of the drive signal of the power switch of the electromagnetic heating device according to the deviation value between the current power and the set target value, so that the current power approaches the target power. In this case, if there is an error between the determined current power and the actual current power, the control device will judge and work based on these current powers with errors, resulting in frequent fluctuations or deviation from the user-set value of the output power, thus the above-mentioned unstable output power situation occurs. In addition, for some slightly more advanced functions, such as intelligent temperature control, pan detection, frequency jitter control, etc., they also rely on the current power as the judgment basis. If the accuracy of the current power is low, the execution effect of the above-mentioned more advanced functions will be greatly reduced, and it may even damage the electromagnetic heating device itself and reduce its service life. Therefore, the accuracy of the determined current power directly affects the overall function of the electromagnetic heating device and the user experience.

[0026] It should be noted that the above takes the induction cooker as an example for the electromagnetic heating device for illustration. However, similar problems also exist in other electromagnetic heating devices. For example, in products such as electromagnetic cooktops, electromagnetic kettles, electromagnetic steamers, industrial electromagnetic heaters, electromagnetic water heaters, etc., the accuracy of power control will also be affected by factors such as voltage fluctuations and frequency offsets, resulting in inaccurate power detection.

[0027] Therefore, in order to improve the accuracy of the current power of the electromagnetic heating device, the present invention proposes a method for determining the power of the electromagnetic heating device. In one embodiment, as Figure 1 shown, the method for determining the power of the electromagnetic heating device includes steps S100 to S400.

[0028] Among them, the electromagnetic heating device can be one of an induction cooker, an electromagnetic cooktop, an electromagnetic kettle, an electromagnetic steamer, an industrial electromagnetic heater, an electromagnetic water heater, etc., and the specific electromagnetic heating device is not limited here.

[0029] In this embodiment, step S100: Obtain the input frequency of the power supply of the electromagnetic heating device, and determine the power sampling period according to the input frequency.

[0030] It can be understood that electromagnetic heating equipment needs to address the following issues: First, the input frequency of the power supply for electromagnetic heating equipment may vary in different countries and regions. For example, in some countries or regions, the mains frequency is 50 Hz, while in other regions, it is 60 Hz. Second, the levels of power grid infrastructure vary in 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 exhibits a certain degree of deviation or irresistible fluctuations.

[0031] It should be noted that, as Figure 2 shown, the mains power is alternating current (refer to Figure 2 waveform A). As Figure 3 shown, an electromagnetic heating device generally includes a rectifier circuit 10, a resonant circuit 20, a power switch 30, and a switch drive circuit 40 connected in sequence. The input end of the rectifier circuit 10 is connected to the mains power and receives an alternating voltage. When the switch drive circuit 40 drives the power switch 30 with a preset PWM drive signal, the voltage at the output end of the rectifier circuit 10 will change from a constant voltage to a periodically varying voltage, such as Figure 2 waveform B in

[0032] In some exemplary electromagnetic heating devices, sampling is performed at a fixed power sampling period. When dealing with the above two problems, inaccurate power sampling may occur. Among them, the existing electromagnetic heating devices set the power sampling time based on a fixed input frequency. In some examples, the electromagnetic heating device uses 50 Hz as the reference and sets a sampling time of 90 seconds. When 50 Hz is converted into the corresponding period, a complete AC cycle is 20 milliseconds, and the corresponding half-wave period is 10 milliseconds. One half-wave period is 10 milliseconds, and the 90-millisecond sampling time can just collect data of 9 complete half-wave periods, so as to calculate the average power during this period more accurately and use it as the actual output power of the current electromagnetic heating device. However, if the above two problems occur, that is, the application area of the electromagnetic heating device is changed or the input frequency fluctuates. Taking the frequency changing from 50 Hz to 60 Hz as an example, since the electromagnetic heating device is set with a fixed sampling time of 90 milliseconds when leaving the factory, the half-wave period corresponding to 60 Hz is 16.7 milliseconds divided by 2, that is, 8.35 milliseconds. 90 milliseconds divided by 8.35 milliseconds is equal to 10.78, that is, 10.78 half-wave periods are sampled. Then, the average power calculated within 10 half-wave periods out of 10.78 is accurate, but in the remaining 0.84 half-wave periods, only part of the waveform is sampled, lacking the complete voltage and current change trends, resulting in the inability of this part of the data to truly reflect the actual power level within this cycle. Therefore, it will affect the accuracy and consistency of the final average power.

[0033] Therefore, in step S100, the power sampling period can be determined based on the input frequency of the power supply. In a feasible implementation manner, after obtaining the input frequency of the power supply, a suitable power sampling period is dynamically determined according to this frequency information. The duration of this power sampling period covers an integer number of complete AC half-wave periods to ensure the integrity and representativeness of the instantaneous power within each sampling period. In some examples, for example, under a 50 Hz power grid, one half-wave period is 10 milliseconds, and the sampling period can be set as an integer multiple of multiple 10 milliseconds; while under a 60 Hz power grid, the half-wave period is about 8.3 milliseconds, and at this time, the sampling period is correspondingly adjusted to an integer multiple of this value. Therefore, step S100 can adaptively adjust the power sampling period according to the change of the input frequency, avoiding problems such as incomplete sampling waveforms and missing sampling points caused by the change of the input frequency, and fundamentally improving the accuracy and consistency of the finally determined current power.

[0034] It should be noted that, as Figure 3As shown, based on the framework of the electromagnetic heating device, that is, the power input terminal, the rectification circuit 10, the resonance circuit 20, and the power switch 30 connected in sequence, the input frequency of the power supply of the electromagnetic heating device obtained in step S100 can be the voltage frequency at the output terminal of the rectification circuit 10, or the voltage frequency at the collector terminal of the power switch 30. Among them, the collector of the power switch 30 is connected to the output terminal of the resonance circuit 20. Of course, it can also be directly taking the voltage frequency of the commercial power at the power input terminal. The specific input frequency acquisition point is not limited here and depends on the requirements of the actual circuit architecture.

[0035] Among them, the power sampling period is determined according to the input frequency and can be calculated by the following formula: , where represents the input frequency, and N is any positive integer. It can be understood that since what is obtained is the time length of two half-wave periods, that is, a complete AC cycle. Therefore, in order to ensure sufficient data acquisition within one or more complete half-wave periods, the power sampling period should be set to an integer multiple of half a period, so as to ensure the integrity of the data. In this way, no matter how the input frequency changes, it can be adjusted to the corresponding power sampling period to ensure that each sampling covers a complete and continuous half-wave period.

[0036] In this embodiment, in step S200, according to the power sampling period, the sampling times and the sampling interval corresponding to the power sampling period are determined.

[0037] It should be noted that the sampling times corresponding to the power sampling period refer to the number of samplings required within the power sampling period, and the sampling interval is the time length between each sampling. It should be noted that the time length between each sampling is the same, that is, the sampling interval is a fixed value and depends on the power sampling period and the sampling times.

[0038] It can be understood that after the power sampling period is determined, the settings of the sampling times and the sampling interval also directly affect the accuracy of the finally determined current power. Since the calculation accuracy of the current power of the electromagnetic heating device depends on the half-wave rectification characteristic of the alternating current, its instantaneous power will show non-linear changes within a complete half-wave period. If only a small number of samplings are performed or the sampling points are unevenly distributed, it may lead to deviations in the sampling of the current power. Therefore, in order to improve the accuracy and consistency of the finally determined current power, it is necessary to ensure that within a complete power sampling period, a sufficient number of samplings are performed on the instantaneous power, and at the same time, the intervals between the sampling points are kept uniform.

[0039] It should be noted that in practical applications, the number of sampling times or the sampling interval is not strictly limited here. When setting the number of sampling times and the sampling interval, factors such as the processing capacity of the MCU and the ADC conversion speed can be considered to avoid an increased workload of the electromagnetic heating device due to too high a sampling frequency, or data loss due to too low a sampling frequency. Optionally, the number of sampling times is selected from 10 to 100 according to the input frequency. The sampling interval depends on the number of sampling times required in each power sampling period.

[0040] In this embodiment, step S300: During the power sampling period, sample the corresponding number of instantaneous powers at the determined number of sampling times and sampling interval.

[0041] It can be understood that the instantaneous power reflects the real-time working state of the electromagnetic heating device at a specific time point, but alone it cannot directly represent the current power of the device during the entire sampling period. By performing multiple samplings at a specified number of sampling times and intervals within a preset power sampling period, the change trend of the instantaneous power can be comprehensively sampled. This lays a foundation for finally calculating the average power, and this average power can be regarded as the current power of the electromagnetic heating device.

[0042] In this embodiment, step S400: Determine the average value of the corresponding number of sampled instantaneous powers as the current power of the electromagnetic heating device.

[0043] It can be understood that based on all the instantaneous powers obtained in step S300, calculate their average value as the current power of the electromagnetic heating device. Calculating the average value can smooth the instantaneous power fluctuations caused by grid fluctuations or other factors, thereby providing an accurate and reliable calculation result of the current power.

[0044] Based on steps S100 to S400, in a feasible implementation manner, such as Figure 4As shown, the electromagnetic heating device is applied to a 50Hz power grid environment. In step S100, the detection circuit obtains the input frequency of the current power supply as 50Hz, and accordingly determines the power sampling period as 10 milliseconds. Next, according to the set power sampling period of 10 milliseconds, it is determined that the number of sampling times within this power sampling period should be 10 times. The sampling points do not include the zero-crossing points. Therefore, the sampling interval is 10 milliseconds divided by the number of sampling times + 1, that is, 10 + 1, which means the sampling interval is 0.909 milliseconds. In this way, the sampling points can be evenly distributed within each half-wave cycle. Subsequently, it enters step S300. The first sampling starts at 0.909 milliseconds after the zero-crossing point, and samples once every 0.909 milliseconds to obtain 10 instantaneous powers. These 10 instantaneous powers completely reflect the power change situation 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 the current working state.

[0045] In summary, the power determination method of the electromagnetic heating device provided by the present invention can improve the accuracy of the current power of the electromagnetic heating device. Based on this method, first, the input frequency of the power supply of the electromagnetic heating device is obtained, and the power sampling period is dynamically determined according to this input frequency. In this way, when the input frequency changes, such as when changing the usage area or there is a mains voltage fluctuation, the power sampling period can be adjusted adaptively to ensure that at least a plurality of instantaneous power values within a complete half-wave waveform can always be collected within the power sampling period, and the average power is calculated based on the plurality of instantaneous power values. This average power is the current power of the electromagnetic heating device, that is, the output power. In this way, this method avoids problems such as incomplete sampling waveforms and missing sampling points caused by using a fixed power sampling period in the prior art, and improves the accuracy and consistency of the current power.

[0046] In one embodiment, as Figure 5 shown, step S100 of determining the power sampling period according to the input frequency further includes step S110 and step S120.

[0047] In this embodiment, step S110 determines the half-wave period corresponding to the input frequency.

[0048] It can be understood that since the electromagnetic heating device is connected to an AC power supply, its voltage waveform changes sinusoidally. A complete cycle contains two half-waves, namely the positive half-wave and the negative half-wave. Therefore, when the input frequency is obtained, first calculate the complete cycle corresponding to this input frequency, and further obtain the corresponding half-wave period. For example, in a 50Hz power grid environment, the complete cycle is 20 milliseconds, and the corresponding half-wave period is 10 milliseconds; while in a 60Hz power grid, the complete cycle is about 16.7 milliseconds, and the corresponding half-wave period is about 8.3 milliseconds.

[0049] In this embodiment, in step S120, a half-wave period that is a first preset integral multiple is configured as the power sampling period.

[0050] It can be understood that using a half-wave period that is a first preset integral multiple as the power sampling period ensures that each power sampling covers an integer number of complete half-wave periods, thereby avoiding errors in the current power caused by incomplete sampling.

[0051] It should be noted that the specific value of the first preset integer multiple is not limited herein and can be set according to different application scenarios.

[0052] Optionally, the first preset integer multiple is set to 1, that is, a complete half-wave period is used as the power sampling period. In this way, on the premise of ensuring a certain accuracy of power sampling, the calculation speed of the current power can be improved. In a 50 Hz environment, the current power can be determined in 10 milliseconds, which is beneficial to application scenarios that require rapid adjustment of the output power.

[0053] Combined with Figure 2 , it can be understood that the B waveform is composed of multiple half-waves, and the period occupied by one steamed bun wave (half-wave), that is, the above-mentioned half-wave period.

[0054] In one embodiment, as Figure 6 shown, step S200 further includes step S210 and step S220.

[0055] In this embodiment, in step S210, according to the time length of the power sampling period, the sampling times corresponding to the power sampling period are determined.

[0056] Among them, the time length of the power sampling period is positively correlated with the sampling times. It can be understood that the positive correlation between the time length of the power sampling period and the sampling times means that: the longer the time length of the power sampling period, the more the sampling times; the shorter the time length of the power sampling period, the fewer the sampling times. Optionally, the time length of the power sampling period and the sampling times are linearly positively correlated.

[0057] In a feasible embodiment, since the power sampling period is an integer number of half-wave periods, only the number of samplings required within one half-wave period needs to be preset. Then, the number of samplings corresponding to the power sampling period can be determined according to the specific value of the first preset integer multiple. It can also be understood that although the mains frequency accessed by the electromagnetic heating device may vary due to different regions or grid fluctuations, in this embodiment, the number of samplings set for one half-wave period can remain unchanged. Because if a uniform sampling method is adopted within one half-wave period, regardless of how the input frequency changes, as long as the sampling points are evenly distributed and the number of samplings is the same, it has no impact on the calculation result of the average power. Therefore, for one half-wave period, the corresponding number of samplings can be set so that the system can determine the specific number of samplings required according to how many half-wave periods the power sampling period specifically has.

[0058] In this embodiment, in step S220, according to the time length of the power sampling period and the determined number of samplings, determine the sampling interval corresponding to the power sampling period.

[0059] Optionally, when the sampling points do not include the zero point, if the power sampling period is 10 milliseconds and the number of samplings is 10, then all 10 samplings fall within the two end points, and the entire power sampling period is also divided into 11 equal parts. Therefore, the sampling interval is: 10 milliseconds / 11, which is approximately equal to 0.909 milliseconds.

[0060] Optionally, when the sampling points include the zero point, if the power sampling period is 10 milliseconds and the number of samplings is 10, then the first sampling point is located at the starting point of the period (i.e., 0 milliseconds), and the remaining 9 sampling points are evenly distributed at subsequent time points, and the entire sampling period is divided into 9 equal parts. At this time, the sampling interval is: 10 milliseconds / 10, which is equal to 1 millisecond. Among them, the last sampling point is located at an interval time before the next power sampling period. It should be noted that each power sampling period only contains one zero-point sampling point, and there will be no situation where the sampling points are repeatedly counted between adjacent periods. For example, among the 10 sampling points in the previous power sampling period, only the first one falls at the zero point of its period starting point; and the sampling point close 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 number of samplings of the current power sampling period to ensure the continuity and consistency of the sampling data.

[0061] Optionally, when the first preset integral multiple is greater than 1 and the sampling points do not include zero, if the power sampling period is 10 milliseconds and the number of samplings is 10, then all 10 samplings fall within the two endpoints. At this time, the entire power sampling period is divided into 11 equal parts. Therefore, the sampling interval is: 10 milliseconds / 11, which is approximately equal to 0.909 milliseconds. Since the power sampling period consists of half-wave periods of the first preset integral multiple, and this first preset integral multiple is greater than 1, there are multiple consecutive half-wave periods in a complete sampling period. In this case, at the start of each half-wave period, a sampling interval, that is, 0.909 milliseconds, will be waited first, and then sampling will be performed sequentially at the set interval. It should be particularly noted that at the endpoint between two half-wave periods, the time interval between the corresponding two consecutive samplings is two sampling intervals, that is, approximately 1.818 milliseconds.

[0062] It can be understood that the specific method for determining the sampling interval and the form of sampling are not limited here and can depend on the requirements of the actual application.

[0063] In one embodiment, step S200 can specifically be determined as step S230. In this embodiment, step S230: determine the sampling interval corresponding to the power sampling period according to the input frequency, and determine the sampling number corresponding to the power sampling period according to the power sampling period and the sampling interval.

[0064] It can be understood that step S230 is to calculate the sampling number according to the sampling interval, and steps S210 and S220 are to calculate the sampling interval according to the sampling number.

[0065] Among them, whether it is step S230 or steps S210 and S220, the sampling density is unchanged. The higher the sampling density, the more accurate the average value calculation is, that is, the more accurate the finally determined current power is. The sampling surface density can be preset first, and then the sampling number and the sampling interval can be determined.

[0066] It should be explained that if the frequency of the input signal is high, a shorter sampling interval can be adopted; on the contrary, if the signal frequency is low, a longer sampling interval can be adopted. The higher the input frequency, the shorter a half-wave period represents. Therefore, the sampling interval also needs to be set shorter so as to sample a sufficient number of instantaneous powers and be able to sample the instantaneous power at key positions. Relatively, the lower the input frequency, the longer a half-wave period represents. Therefore, the sampling interval also needs to be set longer to avoid sampling too many instantaneous powers and increasing the workload of the system processor. Next, based on the selected sampling interval and the known length of the power sampling period, the sampling number can be calculated. The formula that can be used here is: sampling number = power sampling period / sampling interval.

[0067] In one embodiment, such asFigure 7 As shown, the method for determining the power of the electromagnetic heating device further includes step S510 and step S520.

[0068] In this embodiment, step S510: Obtain the zero crossing point of the power supply of the electromagnetic heating device.

[0069] In this embodiment, step S520: According to the zero crossing point of the power supply of the electromagnetic heating device, sample the instantaneous power after delaying for a first duration, and the first duration is equal to the duration corresponding to the sampling interval.

[0070] It can be understood that the zero crossing point of the power supply of the electromagnetic heating device may refer to the position where the voltage value passes through zero when the alternating current of the mains power enters the negative half cycle from the positive half cycle or enters the positive half cycle from the negative half cycle. It can be understood that the half-wave period refers to the time interval between one zero crossing point and the next zero crossing point, corresponding to the duration of half a sine wave. It should be noted that after detecting the zero crossing point of the mains power, sampling is performed after delaying for the first duration, that is, sampling is not performed at the zero crossing point, that is, sampling is not performed at the starting point and the ending point of the power sampling period, but sampling is performed after passing through the first duration, that is, one sampling interval, so as to avoid sampling at the zero crossing point, resulting in sampling of invalid instantaneous power and affecting the accuracy and consistency of subsequent average power calculation.

[0071] It should be noted that the zero crossing point of the power supply of the electromagnetic heating device may also be the zero crossing point of the voltage value after passing through the rectifier circuit 10, that is, the zero crossing point of the voltage value at the output end of the rectifier circuit 10; it may also be the zero crossing point of the voltage value at the collector of the power switch 30. The voltage values at the above two places will be as shown in waveform B in Figure 2 after the switch drive circuit 40 drives the power switch 30, and also has a zero crossing point, and this zero crossing point actually corresponds to the zero crossing point of the power supply (that is, waveform A in Figure 2 ).

[0072] In one embodiment, as shown in Figure 8 step S300 further includes step S310 and step S320.

[0073] In this embodiment, step S310: During the power sampling period, sample the corresponding number of input currents and input voltages with the determined number of samplings and sampling intervals.

[0074] It can be understood that in step S300, the instantaneous power corresponding to the sampling is involved. However, this instantaneous power is actually finally determined according to the sampled input current and input voltage. Therefore, in step S310, the input current and input voltage are sampled. In a feasible implementation, the power sampling period is 10 milliseconds, which is a half-wave period corresponding to 50 Hz. According to the determined number of samplings and sampling intervals, the corresponding number of input current values and input voltage values are respectively collected. That is to say, if the number of samplings is 10, then the current values and voltage values at 10 sampling points will be sampled respectively, and a total of 10 sets of current-voltage values will be obtained. These 10 sets of current-voltage values constitute the change trajectories of the input current and input voltage within the entire sampling period. In this way, the instantaneous power calculated subsequently is more representative, ultimately improving the accuracy and consistency of the finally determined current power.

[0075] It should be noted that, as Figure 3 shown, based on the framework of the electromagnetic heating device, that is, the power input terminal, the rectification circuit 10, the resonance circuit 20, and the power switch 30 connected in sequence, sampling the input current and input voltage can be to obtain the voltage and current at the output terminal of the rectification circuit 10, or to obtain the voltage and current at the collector terminal of the power switch 30. Among them, the collector of the power switch 30 is connected to the output terminal of the resonance circuit 20. It is also worth noting that since the voltage and current at the power input terminal are in a stable waveform, they cannot reflect the current power of the electromagnetic heating device, that is, the input voltage and input current of the commercial power cannot be directly taken at the power input terminal.

[0076] In this embodiment, in step S320, the corresponding number of instantaneous powers are determined according to the corresponding number of the input current and input voltage.

[0077] It can be understood that based on the input current and input voltage collected in step S310, and based on the calculation formula of the instantaneous power: instantaneous power = input voltage value × input current value. That is to say, at each sampling point, the system processor will calculate an instantaneous power value until the input current values and input voltage values sampled at all sampling points are all calculated into the corresponding instantaneous power values. By calculating the average value of these several instantaneous power values, the current power can be obtained.

[0078] It also needs to be noted that in all the above embodiments, and even throughout the text, when it comes to sampling the instantaneous power, it should be associated with sampling the corresponding input current values and input voltage values, and finally calculating the instantaneous power according to the sampled input current values and input voltage values.

[0079] In the above method for determining the power of the electromagnetic heating device, only the calculation steps of the current power in the electromagnetic heating device are involved. However, the present invention also provides a control method for the electromagnetic heating device, and this control method is a control algorithm based on the current power of the electromagnetic heating device.

[0080] In one embodiment, as Figure 9 shown, the control method of the electromagnetic heating device includes step S600 to step S800.

[0081] In this embodiment, step S600: Determine the current power of the electromagnetic heating device according to the power determination method of the electromagnetic heating device.

[0082] It can be understood that the current power can be obtained through the power determination method proposed by the present invention. Specifically, it includes multi-point sampling of the input voltage and input current within a power sampling period determined according to the input frequency, and calculating the instantaneous power point by point according to these sampling values, and finally obtaining the current power through methods such as averaging or integration.

[0083] Since the current power of the electromagnetic heating device reflects the current energy consumption state of the electromagnetic heating device, it can be used as a key basis for subsequent intelligent control and power adjustment.

[0084] It should be noted that in the control method of this electromagnetic heating device, all the current powers mentioned, unless otherwise specified, are calculated through the power determination method of the electromagnetic heating device of the present invention. The specific calculation process refers to the above embodiment. Therefore, the control method of this electromagnetic heating device can at least achieve the beneficial effects of the power determination method of the electromagnetic heating device in the above embodiment, and will not be elaborated here one by one.

[0085] In this embodiment, step S700: Determine the target power of the electromagnetic heating device.

[0086] It can be understood 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 state, representing the heating intensity or energy output level that the electromagnetic heating device expects to reach.

[0087] It can be understood that there are various ways to determine the target power. For example, it can be selected by the user through the operation panel, or determined after automatic adjustment according to the preset program, or dynamically adjusted according to the temperature of the object to be heated feedback by the temperature sensor. And it should be noted that the target power can be a dynamically changing parameter, depending on the application scenario and application situation of the electromagnetic heating device.

[0088] In this embodiment, step S800: Adjust the operating power of the electromagnetic heating device according to the difference between the current power and the target power, so that the current power approaches the target power.

[0089] It can be understood that the control system of the electromagnetic heating device analyzes and processes the deviation between the current power and the target power, thereby determining or calculating the required power increment or decrement, and adjusts the output power of the electromagnetic heating device according to this power increment and decrement. By continuously narrowing the gap between the current power and the target power, the system realizes precise control of the heating process, improving the overall heating efficiency and user experience.

[0090] Among them, the operating power emphasizes the device's ability to do work externally and is the ideal output that is expected to be achieved; while the current power refers to the device's current actual energy consumption, reflecting the actual operating state.

[0091] Optionally, the operating power of the electromagnetic heating device can be adjusted by adjusting the duty cycle of the drive signal of its power switch 30. The duty cycle refers to the proportion of the high-level time within a cycle. Increasing the duty cycle increases the conduction time per cycle, thereby increasing the average operating power; relatively, decreasing the duty cycle will reduce the operating power.

[0092] It can be understood that introducing the current power obtained by the power determination method proposed by the present invention into the control process of the electromagnetic heating device can make the control process of this control method faster and more accurate. First, more accurate means that the sampling and calculation of the current power are more accurate, avoiding the error in determining the current power caused by inaccurate current power in the prior art, thus providing a more reliable reference value for control. Second, the control process is faster, which means that the processor system of the electromagnetic heating device can sample the current power faster. For example, when the power sampling period is a half-wave period, it only takes 10 milliseconds to sample the accurate current power, avoiding the problem of slow average power sampling speed caused by the traditional fixed long period, and also avoiding the long delay time required for the control system of the electromagnetic heating device to take corresponding measures after the user sets the target power. Therefore, the current power sampled by this control method using the above power determination method can complete the corresponding judgment and corresponding control in a short time, and has a faster adjustment ability.

[0093] In one embodiment, as Figure 10 shown, step S800 further includes step S810 and step S820.

[0094] In this embodiment, step S810: Determine the power adjustment amplitude according to the difference between the current power and the target power.

[0095] Wherein, the power adjustment amplitude is positively correlated with the difference between the current power and the target power.

[0096] In this embodiment, step S820: Adjust the operating power of the electromagnetic heating device according to the power adjustment amplitude, so that the current power approaches the target power.

[0097] Optionally, the power adjustment amplitude changes proportionally with the ratio between the current power and the target power. That is to say, when the ratio is close to 1, the electromagnetic heating device is already in or very close to the ideal operating state. At this time, a smaller power adjustment amplitude should be used to adjust the operating power to avoid excessive adjustment causing fluctuations. On the contrary, if the ratio deviates from 1 greatly, the power adjustment amplitude needs to be increased in order to quickly narrow the gap between the two and make the electromagnetic heating device quickly return to work near the target power.

[0098] It can be understood that by adjusting the operating power of the electromagnetic heating device according to the power adjustment amplitude, the goal is to make the difference between the current power and the preset target power less than the set first power preset threshold. That is, the control system will gradually reduce or increase the operating power according to the calculated power adjustment amplitude to adjust the current power and reduce the gap between the current power and the target power set by the user until the accuracy requirement is met. It should be noted that the first power preset threshold can be 10W, 20W, or 30W. Specifically, it is not limited here and can depend on the application scenario.

[0099] It can also be understood that in some exemplary control methods, the operating power is adjusted by a fixed amplitude, which will cause the current power of the electromagnetic heating device to fluctuate repeatedly above and below the target power. Therefore, this control method can determine the power adjustment amplitude according to the difference between the current power and the target power, that is, the power adjustment amplitude is a dynamic value, so as to effectively avoid the current power of the electromagnetic heating device from fluctuating repeatedly above and below the target power.

[0100] In a feasible implementation manner, if the ratio of the target power to the 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 amplitude according to the proportional relationship to quickly reduce the operating power and make the average power quickly approach the target power; if the ratio of the target power to the 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 amplitude for more refined adjustment to avoid fluctuations caused by too fast adjustment; if the ratio of the target power to the 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 amplitude to speed up the power increase speed, so as to quickly narrow the gap and stabilize near the target power.

[0101] In one embodiment, as Figure 11As shown, the control method of the electromagnetic heating device further includes step S911 and step S912.

[0102] In this embodiment, step S911: Obtain the power threshold for pot movement.

[0103] In this embodiment, step S912: When the current power is less than the power threshold for pot movement, determine that pot movement has occurred, and control the power switch 30 of the electromagnetic heating device to pause working.

[0104] Among them, pot movement means that there is a relative displacement between the cookware and the main body of the electromagnetic heating device.

[0105] It can be understood that the power threshold for pot movement is used to identify the power fluctuations caused by user operations, such as moving or shaking the pot. The specific value of the power threshold for pot movement is not limited here. It can be set according to the target power and / or the current power, or dynamically adjusted according to the target power and / or the current power. It is not limited here for the time being.

[0106] In a feasible implementation manner, the electromagnetic heating device first operates in the high-power cooking mode. The target power is set to 1500W, and the power threshold for pot movement is set to 500W. If the calculated current power is 450W, which is less than the power threshold for pot movement, it is determined that pot movement has occurred. However, if the current power is 1000W, which is greater than the power threshold for pot movement at this time, it is determined that no pot movement has occurred.

[0107] It should be noted that due to the fast sampling speed of the current power, when the user performs pot movement or shaking operations, the change in the current power can be quickly captured, and then it can be compared with the power threshold for pot movement faster to determine whether pot movement has occurred. In this way, corresponding adjustments can be made in time to avoid unnecessary hardware damage, and ultimately the goal of extending the service life of the device is achieved.

[0108] It should be noted that when the cookware is removed, if the electromagnetic heating system is still in the working state, the coil in the resonance circuit 20 will continuously generate a high-frequency alternating magnetic field, and this magnetic field cannot be effectively coupled to the metal cookware, resulting in an increase in energy reflection, an increase in the coil temperature, and an increase in the load of the inverter circuit, which may cause overheating, component aging, and even damage. Therefore, it is necessary to stop the operation of the power switch 30 after pot movement, and then pause the generation of the high-frequency alternating magnetic field.

[0109] It is worth mentioning that when it is determined that the pot has been moved and the power switch 30 of the electromagnetic heating device is controlled to pause operation, this step may not be triggered immediately, that is, the power switch 30 does not pause operation as soon as the pot is moved. Optionally, a time judgment can be inserted between the pot movement and the pause of the power switch 30. For example, after the pot is moved and a preset time has elapsed, the power switch 30 is then paused. In this way, false judgments caused by power fluctuations are avoided from affecting the operation of the power switch 30, improving the stability of the electromagnetic heating device.

[0110] Based on steps S911 to S912, in one embodiment, the pot movement power threshold is a dynamic pot movement power threshold, and as Figure 12 shown, in this embodiment, step S911 further includes step S9111 and step S9112.

[0111] In this embodiment, step S9111, when the current power is not less than the target power, update the pot movement power threshold to the power value corresponding to the target power.

[0112] In this embodiment, step S9112, when the current power is less than the target power and the current power is greater than the pot movement power threshold, update the pot movement power threshold to the power value corresponding to the current current power.

[0113] When the current power is not less than the target power, update the pot movement power threshold to the power value corresponding to the target power. In this way, the pot movement detection logic will not misjudge the pot movement due to power fluctuations at high power. When the electromagnetic heating device is in a high-power state and its current power exceeds the target power set by the user, if the current power is used as the pot movement power threshold at this time, it is easy to misjudge the pot movement when the power is reduced due to natural fluctuations at high power. Therefore, by directly setting the pot movement power threshold to the power value corresponding to the target power, when the current power naturally drops to the target power and then the power is reduced, it may be determined that the pot has been moved.

[0114] Optionally, when the current power reaches or exceeds the target power, the pan-moving power threshold is fixed to the target power, that is, the pan-moving determination is triggered only when the power is significantly lower than the target power. For example, when the target power is 1500W and the current power is 1550W, the system sets the pan-moving power threshold to 1500W. This can effectively handle the misjudgment caused by the natural decrease of the current power. In a negative example, if the current power is 1550W, the pan-moving power threshold is 1500W, and the target power is 1450W, then when the current power decreases from 1550W to 1450W, there may be no pan-moving situation, but at this time the pan-moving power threshold is 1500, and the system may determine that there is a pan-moving, which is a misjudgment and cannot effectively improve the service life of the electromagnetic heating device.

[0115] In addition, it should be noted that when directly setting the target power as the pan-moving power threshold, a difference judgment can be added to determine whether to move the pan. For example, when the current power and the pan-moving power threshold reach a certain percentage, it is determined to move the pan, such as 20%. In this way, misjudgment caused by normal power fluctuations can be avoided.

[0116] It can be understood that when the current power is less than the target power but higher than the current pan-moving power threshold, the pan-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 pan-moving power threshold is 500W, when the current power drops to 350W, the system needs to synchronously lower the pan-moving power threshold to 350W to avoid being unable to detect subsequent small power changes due to too high a pan-moving power threshold. At the same time, it can also avoid misjudgment actions caused by poor cookware, resulting in the current power always being below the pan-moving power threshold. Similarly, in some examples, the pan-moving power threshold is 700W. If the current power rises from 700W to 750W (still lower than the target power), the system adjusts the threshold to 750W. In this way, a reasonable judgment logic is ensured throughout the power fluctuation range. Otherwise, in the power between 750W and the target power, there will be a "judgment blank area". In this way, it can adapt to the user's operation.

[0117] In addition, it should be noted that when directly setting the current power as the pan-moving power threshold, a difference judgment can be added to determine whether to move the pan. For example, when the current power and the pan-moving power threshold reach a certain percentage, it is determined to move the pan, such as 20%, to avoid misjudgment caused by normal power fluctuations.

[0118] In summary, in many scenarios, there will be situations of moving the pan. By using the current power obtained by the power determination method of this method, the pan-moving detection speed can be effectively improved, thereby improving the control efficiency of the pan-moving control corresponding to this control method, avoiding the decrease of the service life of the electromagnetic heating device, and thus improving the user's experience.

[0119] In one embodiment, as Figure 13 shown, the control method of the electromagnetic heating device further includes step S921 and step S922.

[0120] In this embodiment, in step S921, control the electromagnetic heating device to enter the frequency dithering mode.

[0121] In this embodiment, in step S922, determine the frequency dithering amplitude according to the difference between the current power and the minimum operating power, and control the power switch 30 of the electromagnetic heating device to perform frequency dithering work according to the frequency dithering amplitude.

[0122] It can be understood that during the operation of the electromagnetic heating device, due to the high-frequency conduction and turn-off of the power switch 30, strong electromagnetic interference will be generated. In order to reduce electromagnetic interference, frequency dithering control technology is usually adopted, that is, the operating frequency of the power switch 30 is dynamically adjusted near the peak of the input voltage waveform, and the interference energy originally concentrated at a certain fixed frequency point is dispersed to a wider frequency band, thereby effectively suppressing electromagnetic interference.

[0123] Therefore, in step S921, it is necessary to turn on the frequency dithering mode when the electromagnetic heating device has high electromagnetic interference to reduce the corresponding electromagnetic interference.

[0124] In step S922, the specific frequency dithering amplitude required by the electromagnetic heating device in the frequency dithering mode can be determined. Among them, the larger the difference between the current power and the lowest continuous power, the higher the operating power of the system at this time; relatively, the smaller the difference between the current power and the lowest continuous power, the lower the operating power of the system at this time. That is to say, the frequency dithering amplitude can be dynamically adjusted with the power. The frequency dithering amplitude is larger at high power, which can more fully disperse the electromagnetic interference energy; while at low power, the frequency dithering range automatically shrinks to avoid output fluctuations or wave loss caused by too large an amplitude, thereby ensuring the working stability of the battery heating device.

[0125] In one embodiment, it can be determined that the quotient of the difference between the current power and the lowest continuous power and a preset amplitude coefficient is the frequency dithering amplitude. It should be noted that dividing the difference between the two by a preset amplitude coefficient is essentially to normalize or scale the difference, so as to convert it into a frequency dithering amplitude suitable for the current load conditions. It can be understood that the preset amplitude coefficient can be a constant determined by experiments and is not specifically limited here. The preset amplitude coefficient is mainly used to adjust the sensitivity of the frequency dithering amplitude to change with the power.

[0126] Thus, when the accuracy and consistency based on the current power are high and the determination speed is fast, the electromagnetic heating device can determine the required frequency hopping amplitude more precisely and quickly in the frequency hopping mode. In this way, the frequency hopping operation can suppress electromagnetic interference more accurately and quickly.

[0127] The present invention also provides a control device, which is used to implement the power determination method of the electromagnetic heating device described in any one of the above, and / or, the control device is used to implement the control method of the electromagnetic heating device described in any one of the above.

[0128] It should be noted that this control device can implement the power determination method and control method of the above-mentioned electromagnetic heating device, can improve the sampling accuracy and consistency of the current power of the electromagnetic heating device, and can also improve the response speed and accuracy of logical control. Compared with the prior art, the beneficial effects of the control device provided by the present invention are the same as those of the power determination method and control method of the electromagnetic heating device provided by the above embodiments, and will not be elaborated here.

[0129] The present invention also proposes an electromagnetic heating device, which includes a control device. The specific technical features and achievable beneficial effects of the control device refer to the above embodiments. Since this electromagnetic heating device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0130] Among them, the electromagnetic heating device can be one of an induction cooker, an electromagnetic stove, an electromagnetic kettle, an electromagnetic steam furnace, an industrial electromagnetic heater, an electromagnetic water heater, etc. The specific electromagnetic heating device is not limited here.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no technical conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, 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: Obtaining the input frequency of the power supply of the electromagnetic heating device, and determining the power sampling period according to the input frequency; Determining the sampling times and sampling intervals corresponding to the power sampling period according to the power sampling period; Sampling the corresponding number of instantaneous powers at the determined sampling times and sampling intervals during the power sampling period; Determining the average value of the corresponding number of the sampled instantaneous powers as the current power of the electromagnetic heating device.

2. The method for determining the power of the electromagnetic heating device according to claim 1, characterized in that The determining the power sampling period according to the input frequency includes: Determining the half-wave period corresponding to the input frequency; Configuring the first preset integral multiple of the half-wave period as the power sampling period.

3. The method for determining the power of the electromagnetic heating device according to claim 2, wherein, The determining the sampling times and sampling intervals corresponding to the power sampling period according to the power sampling period includes: Determining the sampling times corresponding to the power sampling period according to the time length of the power sampling period; wherein, the time length of the power sampling period is positively correlated with the sampling times; Determining the sampling interval corresponding to the power sampling period according to the time length of the power sampling period and the determined sampling times.

4. The method for determining the power of the electromagnetic heating device according to any one of claims 1 to 3, characterized in that, The method for determining the power of the electromagnetic heating device further includes: Obtaining the zero-crossing point of the power supply of the electromagnetic heating device; Sampling the instantaneous power after delaying for the first duration according to the zero-crossing point of the power supply of the electromagnetic heating device, and the first duration is equal to the duration corresponding to the sampling interval.

5. The method for determining the power of the electromagnetic heating device according to any one of claims 1 to 3, characterized in that, The sampling the corresponding number of instantaneous powers at the determined sampling times and sampling intervals during the power sampling period includes: Sampling the corresponding number of input currents and input voltages at the determined sampling times and sampling intervals during the power sampling period; Determining the corresponding number of instantaneous powers according to the corresponding number of the input currents and input voltages.

6. A control method for an electromagnetic heating device, characterized in that The control method of the electromagnetic heating device includes: Determining the current power of the electromagnetic heating device according to the method for determining the power of the electromagnetic heating device as described in any one of claims 1 to 5; Determining the target power of the electromagnetic heating device; Adjusting the working power of the electromagnetic heating device according to the difference between the current power and the target power, so that the current power approaches the target power.

7. The control method of the electromagnetic heating device according to claim 6, characterized in that, The adjusting the working power of the electromagnetic heating device according to the difference between the current power and the target power, so that the current power approaches the target power includes: Determining the power adjustment amplitude according to 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; Adjusting the working power of the electromagnetic heating device according to the power adjustment amplitude, so that the current power approaches the target power.

8. The control method of the electromagnetic heating device according to claim 6 or 7, characterized in that, The control method of the electromagnetic heating device further includes: Obtaining the moving pan power threshold; When the current power is less than the moving pan power threshold, determining that a pan movement occurs, and controlling the power switch of the electromagnetic heating device to suspend working.

9. The control method of the electromagnetic heating device according to claim 8, characterized in that, The moving pan power threshold is a dynamic moving pan power threshold, and the obtaining the moving pan power threshold includes: When the current power is not less than the target power, update the power threshold for pot movement to the power value corresponding to the target power; When the current power is less than the target power and greater than the power threshold for pot movement, update the power threshold for pot movement to the power value corresponding to the current power.

10. The control method of the electromagnetic heating device according to claim 6 or 7, characterized in that, The control method of the electromagnetic heating device further includes: Controlling the electromagnetic heating device to enter a frequency jitter mode; Determine the frequency jitter amplitude according to the difference between the current power and the minimum operating power, and control the power switch of the electromagnetic heating device to perform frequency jitter operation according to the frequency jitter amplitude.

11. A control device, characterized in that, The control device is used to implement the power determination method of the electromagnetic heating device according to any one of claims 1 to 5, and / or, the control device is used to implement the control method of the electromagnetic heating device according to any one of claims 6 to 10.

12. An electromagnetic heating device, characterized in that, The electromagnetic heating device includes the control device according to claim 11.

Images