Electromagnetic heating equipment power adjustment method, device and electromagnetic heating equipment

Abstract

This invention discloses a power adjustment method, apparatus, and electromagnetic heating device for electromagnetic heating equipment, relating to the technical field of electromagnetic heating equipment. The power adjustment method includes: acquiring the current input frequency of the power supply voltage of the electromagnetic heating equipment and determining a power sampling period based on the current input frequency; sampling the power of the electromagnetic heating equipment within the determined power sampling period; calculating the average power over a preset number of power sampling periods based on the sampled power of the electromagnetic heating equipment; and adjusting the operating power of the electromagnetic heating equipment based on the average power. The power adjustment method for electromagnetic heating equipment provided by this invention aims to improve the power adjustment speed of electromagnetic heating equipment.

Description

Technical Field

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

[0002] With existing electromagnetic heating devices, after a user changes the desired power level, the device requires a certain amount of time to adjust to the target power, resulting in a slow power adjustment speed. This not only affects cooking efficiency but may also cause inconvenience for certain cooking processes that require rapid heat adjustment. Summary of the Invention

[0003] The main objective of this invention is to provide a method, apparatus, and electromagnetic heating device for adjusting the power of an electromagnetic heating device, with the aim of improving the speed of power adjustment in electromagnetic heating devices.

[0004] To achieve the above objectives, the present invention proposes a power adjustment method for electromagnetic heating equipment, comprising:

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

[0006] The power of the electromagnetic heating device is sampled at a defined power sampling period;

[0007] Based on the power sampled from the electromagnetic heating device, the average power within a preset number of power sampling periods is calculated;

[0008] The operating power of the electromagnetic heating device is adjusted according to the average power so that the difference between the average power and the target power is less than a first preset power threshold.

[0009] In one embodiment, obtaining the current input frequency of the power supply voltage of the electromagnetic heating device and determining the power sampling period based on the current input frequency includes:

[0010] Obtain the current input frequency, and calculate the corresponding current input period based on the current input frequency;

[0011] The power sampling period is determined based on the current input period.

[0012] In one embodiment, determining the power sampling period based on the current input period includes:

[0013] Determine the half-wave period of the current input period;

[0014] The power sampling period is determined by a multiple of the half-wave period.

[0015] In one embodiment, adjusting the operating power of the electromagnetic heating device based on the average power includes:

[0016] Obtain the maximum power value from the sampled power of the electromagnetic heating device, and calculate the ratio of the maximum power value to the average power;

[0017] A first power adjustment range is determined based on the ratio of the maximum power value to the average power, and the operating power of the electromagnetic heating device is adjusted based on the first power adjustment range; wherein, the first power adjustment range changes inversely with the ratio of the maximum power value to the average power.

[0018] In one embodiment, adjusting the operating power of the electromagnetic heating device based on the average power includes:

[0019] Calculate the ratio of the average power to the target power, and determine the second power adjustment amplitude based on the ratio of the average power to the target power;

[0020] The operating power of the electromagnetic heating device is adjusted according to the second power adjustment amplitude; wherein the second power adjustment amplitude changes proportionally to the ratio of the average power to the target power.

[0021] In one embodiment, adjusting the operating power of the electromagnetic heating device based on the average power includes:

[0022] Obtain the maximum power value from the sampled power of the electromagnetic heating device, and calculate a first ratio between the maximum power value and the average power;

[0023] Determine a second ratio between the average power and the target power;

[0024] The operating power of the electromagnetic heating device is adjusted according to the first ratio and the second ratio.

[0025] In one embodiment, adjusting the operating power of the electromagnetic heating device according to the first ratio and the second ratio includes:

[0026] When the first ratio is greater than the first preset ratio, a first power adjustment amplitude is determined according to the first ratio, and the operating power of the electromagnetic heating device is adjusted according to the first power adjustment amplitude; wherein, the first power adjustment amplitude changes inversely with the first ratio;

[0027] When the first ratio is not greater than the first preset ratio, the second power adjustment amplitude is determined according to the second ratio, and the operating power of the electromagnetic heating device is adjusted according to the second power adjustment amplitude; wherein, the second power adjustment amplitude changes proportionally to the second ratio.

[0028] In one embodiment, sampling the power of the electromagnetic heating device at a defined power sampling period includes:

[0029] Acquire multiple instantaneous input voltages and multiple instantaneous input currents within the power sampling period;

[0030] Based on the product of multiple instantaneous input voltages and multiple instantaneous input currents, the power of the electromagnetic heating device within the sampling period is determined;

[0031] Multiple power values ​​of the electromagnetic heating device are sampled based on the calculated values.

[0032] The present invention also provides a power adjustment device for an electromagnetic heating device, the power adjustment device comprising:

[0033] An input detection circuit is used to detect the current input frequency;

[0034] A sampling period circuit, which is electrically connected to the input detection circuit, is used to calculate the power sampling period based on the current input frequency;

[0035] A power calculation circuit, which is electrically connected to the sampling period circuit, is used to calculate the average power of the power sampling period;

[0036] A power control circuit is electrically connected to the power calculation circuit, and the power control circuit is used to adjust the operating power of the electromagnetic heating device according to the average power.

[0037] The present invention also provides an electromagnetic heating device, the electromagnetic heating device including a controller, the controller being used to implement the electromagnetic heating device power adjustment method as described in any of the above claims.

[0038] The proposed electromagnetic device power adjustment method improves power regulation speed by optimizing the power sampling and adjustment mechanism of electromagnetic heating equipment. First, the current input frequency is acquired, and the power sampling period is determined based on this frequency. Since the power sampling period calculated based on the grid frequency is relatively short, either a half-wave period or a full wavelength period corresponding to the current input frequency can be selected as the sampling period. This ensures that the sampling time matches the grid frequency, improving the accuracy of data acquisition. Importantly, the short sampling period allows for timely sampling, accelerating the sampling speed. Second, multiple instantaneous power values ​​within the power sampling period are sampled, and the average power within the sampling period is determined based on these sampled instantaneous power values. This method avoids the problem of slow average power calculation speed caused by traditional fixed long periods, providing a more real-time and accurate power assessment. Finally, the operating power of the electromagnetic heating equipment is adjusted based on the average power. Therefore, the increased sampling speed leads to faster power adjustment, solving the problem of slow power adjustment speed in existing electromagnetic heating equipment. Attached Figure Description

[0039] 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.

[0040] Figure 1 A flowchart of the first embodiment of the electromagnetic heating device power adjustment method provided by the present invention;

[0041] Figure 2 A flowchart of the second embodiment of the electromagnetic heating device power adjustment method provided by the present invention;

[0042] Figure 3 A flowchart of the third embodiment of the electromagnetic heating device power adjustment method provided by the present invention;

[0043] Figure 4 A flowchart of the fourth embodiment of the electromagnetic heating device power adjustment method provided by the present invention;

[0044] Figure 5 A flowchart of the fifth embodiment of the electromagnetic heating device power adjustment method provided by the present invention;

[0045] Figure 6 A flowchart of the sixth embodiment of the electromagnetic heating device power adjustment method provided by the present invention;

[0046] Figure 7A flowchart of the seventh embodiment of the electromagnetic heating device power adjustment method provided by the present invention;

[0047] Figure 8 A flowchart of the eighth embodiment of the electromagnetic heating device power adjustment method provided by the present invention;

[0048] Figure 9 A schematic diagram of an embodiment of the electromagnetic heating equipment power adjustment device provided by the present invention;

[0049] Figure 10 The waveform diagram shows the power sampling period.

[0050] 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.

[0051] Explanation of icon numbers:

[0052] 10. Power adjustment device for electromagnetic heating equipment; 100. Input detection circuit; 200. Sampling cycle circuit; 300. Power calculation circuit; 400. Power control circuit. Detailed Implementation

[0053] 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.

[0054] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0055] 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. In specific implementation, those skilled in the art may execute S200 first and then S100, etc., but these should all be within the protection scope of this application.

[0056] Existing induction cookers suffer from slow response times when users adjust power. This means there's a noticeable delay between the user setting a new power demand and the cooker actually reaching the target power, resulting in lag. This affects cooking efficiency, especially in scenarios requiring rapid heat adjustment. Furthermore, the load on the induction cooker changes during operations such as stir-frying and tossing; external factors like voltage spikes and surges also impact the load. If the induction cooker cannot adapt to these rapid changes in time, it leads to a poor user experience, and in more serious cases, may cause significant impacts to the heating element, resulting in equipment damage.

[0057] Furthermore, induction cookers are slow to respond when adjusting power. If a voltage surge or other external disturbance occurs, the control system needs time to recognize the change and make corresponding adjustments. This delay prevents the induction cooker from quickly taking protective measures in the face of sudden voltage fluctuations, thus increasing the risk of damage.

[0058] Currently, most induction cookers on the market use the average power value over a long period as their current operating power, especially when dealing with continuous low power output, where this time interval can exceed 100 milliseconds. Under this mechanism, when faced with a power adjustment request, the induction cooker needs a considerable amount of time to stabilize at its target power level, resulting in a poor user experience.

[0059] Therefore, in order to improve the power adjustment speed of electromagnetic heating equipment, the present invention provides a power adjustment method for electromagnetic heating equipment.

[0060] It is understandable that electromagnetic heating equipment can be induction cookers, induction stoves, induction heating rice cookers, and induction heating furnaces, etc., and the specific product is not limited here.

[0061] In one embodiment, such as Figure 1 As shown, the power adjustment method for electromagnetic heating equipment includes steps S100 to S400.

[0062] In this embodiment, step S100 involves obtaining the current input frequency of the power supply voltage of the electromagnetic heating device and determining the power sampling period based on the current input frequency.

[0063] It is understandable that the current input frequency refers to the input frequency of the AC power supply output when the electromagnetic heating equipment is operating. Based on the obtained input frequency, the control system can calculate a suitable power sampling period, which serves as the basis for subsequent power sampling time intervals, ensuring the accuracy of data acquisition and the system's response speed.

[0064] It is important to note that due to differences in power grid frequency standards around the world—for example, most countries use 50Hz (such as China and Europe), while some regions in the Americas use 60Hz—this frequency difference directly affects the operating characteristics and control accuracy of electromagnetic heating equipment. In this embodiment, by acquiring the current input frequency, the system can automatically adapt to the local power grid environment, thereby determining a matching power sampling period. Therefore, this method not only ensures the global compatibility of electromagnetic heating equipment but also improves its operational stability and efficiency under different power grid conditions.

[0065] In this embodiment, step S200 involves sampling the power of the electromagnetic heating device at a determined power sampling period.

[0066] Understandably, in step S200, the control system captures the actual power consumption at different times during the electromagnetic heating process to reflect changes in the equipment's operating status. To achieve this, the control system periodically samples the power of the electromagnetic heating equipment according to a set power sampling period. These power samples are instantaneous and are crucial for understanding the impact of load changes, power grid fluctuations, and user operations on the electromagnetic heating equipment.

[0067] In this embodiment, step S300 involves calculating the average power within a preset number of power sampling periods based on the power sampled from the electromagnetic heating device.

[0068] Understandably, in step S300, the control system calculates the average power within the power sampling period based on the power of the electromagnetic heating device collected in step S200. This helps smooth power fluctuations over a short period and reduces the impact of grid instability or sudden load changes. The average power not only provides an overall performance indicator of the device over a complete cycle but also provides a reliable basis for adjusting the actual output.

[0069] It is important to note that sampling the power of the electromagnetic heating device within the power sampling period can resolve the issue of inaccurate average power calculations caused by actual power fluctuations within the corresponding time period. During operation, the power of the electromagnetic heating device often fluctuates dynamically due to variations in the grid output power; a single instantaneous power value cannot comprehensively describe the energy consumption characteristics of the entire cycle. Therefore, the key to this embodiment is to obtain the actual power consumption at different times during the electromagnetic heating process by dynamically adjusting the power sampling period based on the input frequency. Since the power sampling period is precisely calculated based on the grid frequency, it ensures that the collected data covers all necessary power change information while avoiding unnecessary oversampling or undersampling. Thus, multiple power values ​​collected within a precisely set power sampling period can accurately reflect the actual operating status of the device during that time period. The average power that can be calculated based on the acquired instantaneous power can more accurately represent the actual power consumption within that cycle, providing reliable data support for subsequent power adjustments.

[0070] It is also important to note that in existing technologies, electromagnetic heating devices such as induction cookers typically use a fixed, relatively long sampling period (e.g., exceeding 100 milliseconds) to calculate average power. This method, due to its long sampling period, results in a slow response to power changes and cannot quickly adjust to the target power, which is particularly inadequate when rapid power adjustment is required. However, this embodiment dynamically adjusts the power sampling period based on the current input frequency (e.g., selecting a half-wave period or a full wavelength period as the sampling period), ensuring that the sampling period matches the grid frequency and significantly shortening the sampling period. For example, at a grid frequency of 50Hz, the sampling period can be set to 10 milliseconds (half a period). Thus, the sampling time in this embodiment is shorter, enabling the sampling of power within the power sampling period to be completed in a shorter time, thereby more quickly identifying power change trends and making corresponding adjustments. Therefore, by accelerating the sampling speed, the speed of power adjustment is improved, allowing the electromagnetic heating device to respond more quickly to the user's power adjustment needs and adapt to load changes and grid fluctuations.

[0071] In this embodiment, step S400 involves adjusting the operating power of the electromagnetic heating device based on the average power, so that the difference between the average power and the target power is less than a first power preset threshold.

[0072] Understandably, in step S400, the control system dynamically adjusts the operating power of the electromagnetic heating device based on the average power calculated in step S300. If the average power is lower or higher than the desired target value, the control system will correspondingly increase or decrease the operating power of the electromagnetic heating unit to achieve the required heating effect.

[0073] It should be noted that the first preset power threshold can be 10W, 20W, or 30W; the specific value is not limited here and can be determined based on the application scenario. When the difference between the average power and the target power is less than the first preset power threshold, it means that the electromagnetic heating device has reached its ideal working state.

[0074] In summary, the electromagnetic device power adjustment method proposed in this invention improves the power adjustment speed by optimizing the power sampling and adjustment mechanism of the electromagnetic heating device. First, the current input frequency is acquired, and the power sampling period is determined based on this frequency. The power sampling period calculated from the grid frequency is relatively short; therefore, a half-wave period or a full wavelength period corresponding to the current input frequency can be selected as the sampling period, ensuring that the sampling time matches the grid frequency and improving the accuracy of data acquisition. Importantly, its short sampling period allows for timely sampling, accelerating the sampling speed. Second, multiple instantaneous power values ​​within the power sampling period are sampled, and the average power within the power sampling period is determined based on these sampled instantaneous power values. This method avoids the problem of slow average power calculation speed caused by traditional fixed long periods, providing a more real-time and accurate power assessment. Finally, the operating power of the electromagnetic heating device is adjusted based on the average power. Therefore, the increased sampling speed leads to a faster power adjustment speed, solving the problem of slow power adjustment speed in existing electromagnetic heating devices.

[0075] It should be noted that in some situations, users frequently toss the pan when using electromagnetic heating devices, such as induction cookers. This operation leads to abnormally frequent power fluctuations. Rapid operations like tossing the pan not only alter the coupling efficiency between the cooking appliance and the induction cooker but also cause drastic load changes. By employing this electromagnetic device power adjustment method, the power sampling period can be dynamically adjusted based on the current input frequency, significantly shortening the sampling period compared to traditional fixed, long sampling periods. The advantage of this is that even under rapidly changing load conditions, instantaneous power changes can be quickly captured, allowing for faster and more accurate power adjustments based on this precise data.

[0076] In one embodiment, such as Figure 2 As shown, step S100 also includes steps S110 and S120.

[0077] In this embodiment, step S110 involves obtaining the current input frequency and calculating the corresponding current input period based on the current input frequency.

[0078] Understandably, the current input frequency of the power grid directly determines the periodic variation of the alternating current, and the input period is the reciprocal of the input frequency. By clearly defining the current input period, the system can accurately grasp the variation patterns of the grid voltage and current, thus providing a basis for the time reference of subsequent power sampling. For example, if the current input frequency is 50Hz, its corresponding input period is 20 milliseconds.

[0079] In this embodiment, step S120 involves determining the power sampling period based on the current input period.

[0080] Understandably, the control system further calculates a suitable power sampling period based on the determined current input period. The choice of the power sampling period directly affects the speed and accuracy of power adjustment. Optionally, the power sampling period can be set as a portion of the input period, such as half a wave period or a full wavelength period, to ensure that the sampled data can fully cover grid fluctuations while avoiding delays caused by excessively long sampling times. In this way, the control system can complete high-frequency sampling of power in a short time, capturing more realistic instantaneous power change information, thereby providing reliable data support for subsequent calculation of average power and adjustment of operating power.

[0081] In one embodiment, such as Figure 3 As shown, step S120 also includes steps S121 and S122.

[0082] In this embodiment, step S121 involves determining the half-wave period of the current input cycle. It is understood that the half-wave period is the time required for the alternating current to complete half a sine wave change. By clearly defining the half-wave period, important instantaneous power information can be avoided during subsequent power sampling. For example, the input cycle of a 50Hz power grid is 20 milliseconds, while its half-wave period is 10 milliseconds; the input cycle of a 60Hz power grid is approximately 16.67 milliseconds, and its half-wave period is approximately 8.33 milliseconds.

[0083] In this embodiment, step S122 involves determining the power sampling period as a multiple of the half-wave period.

[0084] Understandably, the power sampling period can be set to an integer multiple of the half-wave period (such as 1, 2, or more) according to actual needs to balance the relationship between sampling accuracy and response speed. If the sampling period is too short, it may lead to inaccurate average power calculation; while if the sampling period is too long, it may lead to delays in power adjustment. It is important to note that by using a multiple of the half-wave period as the sampling period, the system can complete high-frequency sampling in a shorter time while ensuring the representativeness of the sampled data. In this way, a reliable guarantee is provided for the rapid and accurate calculation of the average power of the electromagnetic heating equipment.

[0085] It is important to note that within a half-wave cycle, the changes in grid voltage and current follow a sinusoidal pattern, and the power of the electromagnetic heating equipment is determined by the product of voltage and current. Therefore, a half-wave cycle encompasses the complete process of the sinusoidal power change from zero to peak value and back to zero, comprehensively reflecting the power fluctuation characteristics within that cycle. By collecting the power within a half-wave and calculating its average value, the influence of power fluctuations in both positive and negative half-cycles can be effectively offset, resulting in an accurate average power value. This avoids the delay problem caused by excessively long sampling periods, enabling rapid and accurate calculation of the average power of the electromagnetic heating equipment.

[0086] like Figure 10 As shown, Figure 10 Three half-wave periods are given, which can be used as the power sampling period. The third triangular waveform from left to right is caused by the large difference between the maximum power value and the average power, which will be explained later.

[0087] In one embodiment, such as Figure 4 As shown, step S400 also includes steps S411 and S412.

[0088] In this embodiment, step S411 involves obtaining the maximum power value among the sampled power of the electromagnetic heating device and calculating the ratio of the maximum power value to the average power.

[0089] It is understood that the maximum power value in the power output of the electromagnetic heating device represents the highest point of output power within the current sampling period. This maximum power value typically occurs when the grid voltage and current reach their peak values, reflecting the device's maximum energy output capability within that period. Due to factors such as load changes, grid fluctuations, or external interference during electromagnetic heating, instantaneous power may fluctuate significantly, and the peak value captures the upper limit of these fluctuations. Obtaining the maximum power value can help identify potential power anomalies and provide important reference for optimizing power regulation strategies, thereby ensuring the stability and efficiency of device operation.

[0090] In this embodiment, step S412 involves determining a first power adjustment range based on the ratio of the maximum power value to the average power value, and adjusting the operating power of the electromagnetic heating device based on the first power adjustment range.

[0091] In this embodiment, the first power adjustment amplitude changes inversely with the ratio of the maximum power value to the average power value. The ratio of the maximum power value to the average power value can be either the maximum power value divided by the average power value, or the average power value divided by the maximum power value.

[0092] Understandably, in step S412, the first power adjustment range is determined by calculating the ratio of the maximum power value to the average power. A large ratio indicates significant power fluctuations, suggesting unstable load characteristics or a near-triangular waveform, such as the use of poor-quality cookware. In this case, a large power adjustment range may cause the equipment to frequently enter a protection state, potentially affecting its normal operation. Therefore, to prevent instability caused by excessively rapid or large adjustments, the first power adjustment range should be reduced accordingly (i.e., inversely proportional) to achieve more precise and stable power regulation. Conversely, a smaller ratio of the maximum power value to the average power indicates relatively gentle power fluctuations, with the electromagnetic heating equipment operating in a more stable state. In this case, the power adjustment range can be appropriately increased to accelerate power adjustment and allow the electromagnetic heating equipment to reach the target power more quickly. This not only improves the flexibility and adaptability of power regulation but also effectively addresses power demand changes under different operating conditions, ensuring stable system operation.

[0093] Optionally, the operating power of the electromagnetic heating device is adjusted according to the first power adjustment amplitude, so that the difference between the average power and the target power is less than the first preset power threshold. It is understood that the control system will gradually decrease or increase the operating power based on the calculated first power adjustment amplitude to adjust the average power and reduce the gap between the average power and the user-set target power until the accuracy requirements are met. It should be noted that the first preset power threshold can be 10W, 20W, or 30W; the specific value is not limited here and can depend on the application scenario.

[0094] In one feasible implementation, the current input frequency is 50Hz, corresponding to an input period of 20 milliseconds and a half-wave period of 10 milliseconds. The control system uses 10 milliseconds as the power sampling period. The instantaneous power values ​​collected within this sampling period are 800W, 1000W, 1200W, 1000W, and 800W, respectively. The calculated average power is 960W, while the maximum instantaneous power is 1200W. By calculating the ratio of the maximum power value to the average power (1200 / 960 = 1.25), the system determines that the power fluctuation is relatively drastic. Therefore, the first power adjustment amplitude is reduced to 70% of the original amplitude to avoid instability caused by excessively rapid adjustment. Subsequently, the control system gradually adjusts the operating power based on the difference between the target power (e.g., 1000W) and the current average power (960W) until the difference is less than a first preset power threshold (e.g., 20W). This dynamic adjustment mechanism not only improves the accuracy and speed of power regulation but also ensures the stability and adaptability of the equipment under different operating conditions.

[0095] In addition, by calculating the ratio of the maximum power value to the average power, drastic fluctuations, such as power fluctuations caused by tossing the pan, can be detected. This allows for a more precise power adjustment strategy, avoiding instability caused by excessively fast or large adjustments, which also provides users with a better experience when using electromagnetic heating equipment.

[0096] In one embodiment, such as Figure 5 As shown, step S400 also includes steps S421 and S422. Steps S411 to S412 and steps S421 to S422 are not related and are two independent embodiments.

[0097] In this embodiment, step S421 involves calculating the ratio of the average power to the target power, and determining the second power adjustment amplitude based on the ratio of the average power to the target power.

[0098] Understandably, step S421 primarily considers the difference between the current average power and the target power. By calculating the ratio of the two (i.e., average power / target power), the degree of this difference can be quantified. For example, if the current average power is 960W and the target power is 1000W, the ratio is 0.96. Based on this ratio, the system can dynamically adjust its power adjustment range.

[0099] In this embodiment, step S422 involves adjusting the operating power of the electromagnetic heating device according to the second power adjustment amplitude.

[0100] Optionally, the second power adjustment amplitude varies proportionally to the ratio between the average power and the target power. That is, when the ratio is close to 1 (i.e., the average power is close to the target power), the electromagnetic heating device is already at or very close to its ideal operating state. In this case, a smaller power adjustment amplitude should be used to achieve fine adjustment and avoid fluctuations caused by over-adjustment. Conversely, if the ratio deviates significantly from 1 (e.g., the average power is significantly lower or higher than the target power), the power adjustment amplitude needs to be increased to more quickly narrow the gap between the two, allowing the device to rapidly return to operation near the target power.

[0101] Understandably, adjusting the operating power of the electromagnetic heating device based on the second power adjustment amplitude aims to ensure that the difference between the average power and the preset target power is less than the set first power preset threshold. In other words, the control system will gradually decrease or increase the operating power based on the calculated second power adjustment amplitude to adjust the average power and reduce the gap between the average 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.

[0102] In a practical application scenario, the current input frequency is 50Hz, corresponding to an input period of 20 milliseconds and a half-wave period of 10 milliseconds. The control system uses 10 milliseconds as the power sampling period. The instantaneous power values ​​collected within this sampling period are 800W, 1000W, 1200W, 1000W, and 800W, respectively, resulting in an average power of 960W, while the target power is 1200W. By calculating the ratio of the target power to the average power (1200 / 960 = 1.25), the system determines that a power increase is needed. Therefore, the first power adjustment amplitude is increased to 130% of the original amplitude to avoid the target power not being reached for an extended period. Subsequently, the control system gradually adjusts the operating power based on the difference between the target power (e.g., 1000W) and the current average power (960W) until the difference is less than a first preset power threshold (e.g., 20W). This dynamic adjustment mechanism not only improves the accuracy and speed of power regulation but also ensures the stability and adaptability of the equipment under different operating conditions.

[0103] 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 second 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 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 control system will use a smaller second power adjustment amplitude 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 second power adjustment amplitude to accelerate the power increase speed, thereby quickly narrowing the gap and stabilizing near the target power.

[0104] In one embodiment, such as Figure 6 As shown, step S400 further includes steps S430 to S450.

[0105] The first ratio is the ratio of the maximum power value to the average power value, which is either the maximum power value divided by the average power value, or the average power value divided by the maximum power value.

[0106] In this embodiment, step S430 involves obtaining the maximum power value from the sampled power of the electromagnetic heating device and calculating a first ratio between the maximum power value and the average power.

[0107] Understandably, the maximum power value in the power output of an electromagnetic heating device represents the highest point of its output power within the current sampling period. This maximum power value typically occurs when the grid voltage and current reach their peak values, reflecting the device's maximum energy output capability within that period. Due to factors such as load changes, grid fluctuations, or external interference during electromagnetic heating, instantaneous power may fluctuate significantly, and the peak value captures the upper limit of these fluctuations. Obtaining the maximum power value helps identify potential power anomalies and provides important reference for optimizing power regulation strategies, thereby ensuring the stability and efficiency of equipment operation.

[0108] In this embodiment, step S440 involves determining a second ratio between the average power and the target power.

[0109] The second ratio is the ratio of the average power to the target power, which is either the average power divided by the target power, or the target power divided by the average power. The target power is the power set by the user.

[0110] In this embodiment, step S450 involves adjusting the operating power of the electromagnetic heating device according to the first ratio and the second ratio.

[0111] Understandably, the first ratio reflects the relationship between the maximum instantaneous power and the average power, indicating the severity of power fluctuations within the current cycle. The second ratio, however, measures the difference between the current average power and the user-set target power, providing a reference for the direction and magnitude of power adjustments. Optionally, the first ratio should be prioritized when adjusting power, because a large first ratio (i.e., a significant increase in maximum power relative to average power) indicates substantial fluctuations or instability in the electromagnetic heating process, such as sudden load changes caused by operations like tossing the pot. In this case, to avoid instability caused by rapid or large adjustments, a smaller power adjustment amplitude should be used for fine-tuning. Only when it is confirmed that there are no obvious abnormal power fluctuations (i.e., the first ratio is within the normal range, and there are no violent fluctuations similar to a triangular wave) should the power adjustment amplitude be increased based on the second ratio to accelerate the attainment of the target power. This strategy ensures a rapid and smooth response to the user's power demands under any operating condition, while protecting the equipment from potential damage and improving the stability of the electromagnetic heating equipment.

[0112] In one embodiment, such as Figure 7 As shown, step S450 specifically includes steps S451 and S452.

[0113] In this embodiment, step S451 involves determining a first power adjustment range based on the first ratio when the first ratio is greater than a first preset ratio, and adjusting the operating power of the electromagnetic heating device based on the first power adjustment range.

[0114] The first modulation power amplitude changes inversely with the first ratio. That is, the larger the first ratio, the smaller the first modulation power amplitude; the smaller the first ratio, the larger the first modulation power amplitude. The specific adjustment parameters for the first ratio and the first modulation power amplitude are not limited here, as long as the first modulation power amplitude changes inversely with the first ratio, the beneficial effects of this method can be achieved.

[0115] Understandably, when the ratio of the maximum power to the average power (the first ratio) is greater than a pre-set first preset ratio, it indicates a significant power fluctuation. In this case, the control system will first determine the first power adjustment range based on the ratio of the maximum power to the average power, and then adjust the operating power of the electromagnetic heating equipment according to this first power adjustment range. It's important to explain that a large ratio of the maximum power to the average power indicates severe power fluctuations during the electromagnetic heating process, possibly caused by factors such as unstable load, power grid fluctuations, or external interference. In this situation, directly adjusting based on the ratio of the target power to the average power might lead to excessively rapid or large adjustments, increasing the risk of the equipment entering a protection state, or even affecting its normal operation. Therefore, in this case, a more precise and stable first power adjustment range is preferred to stabilize the equipment's operation.

[0116] In this embodiment, step S452 involves determining a second power adjustment range based on the second ratio when the first ratio is not greater than a first preset ratio, and adjusting the operating power of the electromagnetic heating device based on the second power adjustment range.

[0117] The second power modulation amplitude changes proportionally to the second ratio. That is, the larger the second ratio, the larger the second power modulation amplitude; the smaller the second ratio, the smaller the second power modulation amplitude. The specific adjustment parameters for the second ratio and the second power modulation amplitude are not limited here, as long as the second power modulation amplitude changes proportionally to the second ratio, the beneficial effects of this method can be achieved.

[0118] Understandably, when the ratio of the maximum power to the average power is no greater than the first preset ratio, it means that the electromagnetic heating equipment is operating relatively smoothly without significant power fluctuations. In this case, the second power adjustment range can be safely determined based on the ratio between the average power and the target power, and the operating power of the electromagnetic heating equipment can be adjusted accordingly. This speeds up the power adjustment, allowing the electromagnetic heating equipment to reach the target power more quickly, while ensuring the accuracy and stability of the adjustment process.

[0119] It should be noted that during the operation of the electromagnetic heating equipment, if no obvious abnormal power fluctuations are detected (i.e., the power change does not exhibit a drastic fluctuation pattern similar to a triangular wave), the power adjustment strategy can be determined based on the ratio of the target power to the average power. Here, a "triangular wave" refers to a situation where the power changes sharply with time, typically indicating that the equipment is experiencing significant load changes or grid fluctuations. In this case, to avoid the risks associated with rapid adjustments, a detailed adjustment should first be performed through step S451; however, in the absence of such drastic fluctuations, the method in step S452 can be directly used to adjust the power more efficiently using the ratio of the target power to the average power.

[0120] It should be noted that the first preset ratio can be 1.1, 1.2, etc., and there is no specific limitation here. If it is greater than the first preset ratio, it indicates that the current input waveform is close to a triangular wave and the power fluctuation is large.

[0121] In one feasible implementation, the current input frequency is 50Hz, the sampling period is 10 milliseconds, and the target power is set to 1000W. If the instantaneous power sampling values ​​are 800W, 1000W, 1200W, 1000W, and 800W, the calculated average power is 960W, and the maximum instantaneous power is 1200W. The ratio of the average power to the maximum instantaneous power is 1.25, which is greater than the preset first ratio of 1.2, indicating that the power fluctuation is severe. The control system enters step S152, and achieves fine and stable power adjustment by reducing the first power adjustment amplitude (e.g., adjusting the original amplitude to 97.5%). However, if the instantaneous power sampling value is 900W, The calculated average power is 940W, and the maximum instantaneous power is 1000W, calculated from 950W, 1000W, 950W, and 900W. The ratio of the target power to the average power is 1.06, which is less than 1.2, indicating that the power fluctuation is small. The system then proceeds to step S153, slightly increasing the second power adjustment amplitude (e.g., adjusting it to 100.6% of the original amplitude) based on the ratio of the target power to the average power (1000 / 940≈1.06) to accelerate the power adjustment speed and allow the equipment to quickly approach the target power. This pre-judgment mechanism ensures stable operation of the equipment during periods of severe fluctuation, while efficiently completing power adjustment under stable operating conditions.

[0122] In one embodiment, such as Figure 8 As shown, step S200 also includes steps S210 to S230.

[0123] In this embodiment, step S210 involves acquiring multiple instantaneous input voltages and multiple instantaneous input currents within the power sampling period.

[0124] In this embodiment, step S220 involves determining multiple powers of the electromagnetic heating device within the sampling period based on the product of multiple instantaneous input voltages and multiple instantaneous input currents.

[0125] In this embodiment, step S230 involves sampling the calculated power of the electromagnetic heating device.

[0126] Understandably, the control system acquires the current input voltage and current values, which form the basis for calculating instantaneous power. Next, it determines the input voltage and current within the currently set power sampling period, ensuring that the voltage and current data accurately reflect the actual operating state within that period. Then, based on these voltage and current values, it calculates multiple instantaneous powers within that sampling period. Since the power of the electromagnetic heating device is the product of voltage and current, by capturing the voltage and current at different points in time within this period, the instantaneous power at each moment can be accurately calculated, thus reflecting the impact of load changes, power grid fluctuations, or user operations on the electromagnetic heating device. Finally, these multiple calculated instantaneous powers are sampled to determine the multiple powers of the electromagnetic heating device within the sampling period, which are then used to calculate the average power.

[0127] The present invention also provides a power adjustment device 10 for an electromagnetic heating device, such as... Figure 9 As shown, the electromagnetic heating equipment power adjustment device 10 includes an input detection circuit 100, a sampling period circuit 200, a power calculation circuit 300, and a power control circuit 400. The input detection circuit 100 is used to detect the current input frequency. The sampling period circuit 200 is electrically connected to the input detection circuit 100 and is used to calculate the power sampling period based on the current input frequency. The power calculation circuit 300 is electrically connected to the sampling period circuit 200 and is used to calculate the average power within the power sampling period. The power control circuit 400 is electrically connected to the power calculation circuit 300 and is used to adjust the operating power of the electromagnetic heating equipment based on the average power.

[0128] It is understood that the electromagnetic heating device has a power switch, which is driven by a drive circuit with a drive signal. When the power switch is activated, heating can be achieved by placing a pot on the induction cooker. The power control circuit 400 can be electrically connected to the drive circuit. The power control circuit 400 controls the drive signal output by the drive circuit according to the power adjustment method of the electromagnetic heating device described above, so that the power switch reaches the corresponding power.

[0129] The present invention also provides an electromagnetic heating device, the electromagnetic heating device including a controller, the controller being used to implement the electromagnetic heating device power adjustment method as described in any of the above claims.

[0130] The present invention also proposes an electromagnetic heating device, which includes a controller for implementing a power adjustment method for the electromagnetic heating device. Specific embodiments of the power adjustment method for the electromagnetic heating device are described above. Since the present 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 elaborated here.

[0131] It is understandable that electromagnetic heating equipment can be induction cookers, induction stoves, induction heating rice cookers, and induction heating furnaces, etc., and the specific product is not limited here.

[0132] 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 adjusting the power of an electromagnetic heating device, characterized in that, The power adjustment method for the electromagnetic heating equipment includes: Obtain the current input frequency of the power supply voltage of the electromagnetic heating device, and determine the power sampling period based on the current input frequency; The power of the electromagnetic heating device is sampled at a defined power sampling period; Based on the power sampled from the electromagnetic heating device, the average power within a preset number of power sampling periods is calculated; The operating power of the electromagnetic heating device is adjusted according to the average power so that the difference between the average power and the target power is less than a first preset power threshold. The step of obtaining the current input frequency of the power supply voltage of the electromagnetic heating device and determining the power sampling period based on the current input frequency includes: Obtain the current input frequency, and calculate the corresponding current input period based on the current input frequency; The power sampling period is determined based on the current input period; Determining the power sampling period based on the current input period includes: Determine the half-wave period of the current input period; The power sampling period is determined by a multiple of the half-wave period.

2. The power adjustment method for electromagnetic heating equipment as described in claim 1, characterized in that, The step of adjusting the operating power of the electromagnetic heating device according to the average power includes: Obtain the maximum power value from the sampled power of the electromagnetic heating device, and calculate the ratio of the maximum power value to the average power; A first power adjustment range is determined based on the ratio of the maximum power value to the average power, and the operating power of the electromagnetic heating device is adjusted based on the first power adjustment range; wherein, the first power adjustment range changes inversely with the ratio of the maximum power value to the average power.

3. The power adjustment method for electromagnetic heating equipment as described in claim 1, characterized in that, The step of adjusting the operating power of the electromagnetic heating device according to the average power includes: Calculate the ratio of the average power to the target power, and determine the second power adjustment amplitude based on the ratio of the average power to the target power; The operating power of the electromagnetic heating device is adjusted according to the second power adjustment amplitude; wherein the second power adjustment amplitude changes proportionally to the ratio of the average power to the target power.

4. The power adjustment method for electromagnetic heating equipment as described in claim 1, characterized in that, The step of adjusting the operating power of the electromagnetic heating device according to the average power includes: Obtain the maximum power value from the sampled power of the electromagnetic heating device, and calculate a first ratio between the maximum power value and the average power; Determine a second ratio between the average power and the target power; The operating power of the electromagnetic heating device is adjusted according to the first ratio and the second ratio.

5. The power adjustment method for electromagnetic heating equipment as described in claim 4, characterized in that, The step of adjusting the operating power of the electromagnetic heating device according to the first ratio and the second ratio includes: When the first ratio is greater than the first preset ratio, a first power adjustment amplitude is determined based on the first ratio, and the operating power of the electromagnetic heating device is adjusted based on the first power adjustment amplitude; wherein, the first power adjustment amplitude changes inversely with the first ratio; When the first ratio is not greater than the first preset ratio, the second power adjustment amplitude is determined according to the second ratio, and the operating power of the electromagnetic heating device is adjusted according to the second power adjustment amplitude; wherein, the second power adjustment amplitude changes proportionally to the second ratio.

6. The power adjustment method for electromagnetic heating equipment as described in claim 1, characterized in that, The sampling of the power of the electromagnetic heating device during the defined power sampling period includes: Acquire multiple instantaneous input voltages and multiple instantaneous input currents within the power sampling period; Based on the product of multiple instantaneous input voltages and multiple instantaneous input currents, the power of the electromagnetic heating device within the sampling period is determined; Multiple power values ​​of the electromagnetic heating device are sampled based on the calculated values.

7. A power adjustment device for an electromagnetic heating equipment, characterized in that, The electromagnetic heating equipment power adjustment device is used to implement the electromagnetic heating equipment power adjustment method as described in any one of claims 1 to 6.

8. An electromagnetic heating device, characterized in that, The electromagnetic heating device includes a controller, which is used to implement the power adjustment method of the electromagnetic heating device as described in any one of claims 1 to 6.

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