Electromagnetic heating equipment control method, control device and electromagnetic heating equipment

Abstract

The invention discloses an electromagnetic heating equipment control method and device and electromagnetic heating equipment, and relates to the technical field of electromagnetic heating, and the electromagnetic heating equipment control method comprises the steps: obtaining the wave-loss-free continuous heating power and the target minimum power, and obtaining the target minimum power according to the wave-loss-free continuous heating power and the target minimum power; the number of the heating time periods is determined, and the sum of the durations of the determined heating time periods of the corresponding number is determined as a heating period; obtaining target power; and determining the number of required heating time periods according to the target power and the target minimum power, and in the heating period, controlling the electromagnetic heating equipment to operate at the wave-loss-free continuous heating power according to the determined number of heating time periods. According to the electromagnetic heating equipment control method provided by the invention, the stability of the electromagnetic heating equipment during low-power operation can be improved, so that the use experience feeling of a user during low-power operation of the electromagnetic heating equipment is improved.

Description

Technical Field

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

[0002] Currently, when the induction cooker on the market works at a low power, its heating method is an intermittent heating method, such as working for a period of time and then pausing for a period of time. However, the pause time is relatively long, usually more than 10 seconds. During the pause, the food cools down, which also causes uneven heating during cooking for users and results in a poor user experience. Summary of the Invention

[0003] The main object of the present invention is to provide a control method, a control device and an electromagnetic heating device for an electromagnetic heating device, aiming to improve the user experience.

[0004] To achieve the above object, the control method for an electromagnetic heating device provided by the present invention includes: Obtain the continuous heating power without wave loss and the target minimum power, and determine the number of heating time periods according to the continuous heating power without wave loss and the target minimum power, and determine the total duration of the corresponding number of heating time periods as the heating cycle; Obtain the target power; Determine the required number of heating time periods according to the target power and the target minimum power, and within the heating cycle, control the electromagnetic heating device to operate at the continuous heating power without wave loss according to the determined number of heating time periods.

[0005] In an embodiment, the obtaining the continuous heating power without wave loss includes: Gradually adjust the operating power of the electromagnetic heating device according to a first preset period, and count the number of hard turn-ons of the electromagnetic heating device within each first preset period; the hard turn-on means that when the power switch of the electromagnetic heating device is turned on, the terminal voltage of the power switch is greater than a first preset voltage; When the accumulated number of hard turn-ons within any one first preset period reaches a first preset value, determine the operating power of the current first preset period as the continuous heating power without wave loss.

[0006] In an embodiment, the gradually adjusting the operating power of the electromagnetic heating device according to a first preset period includes: Gradually adjust the operating power of the electromagnetic heating device from small to large according to a first preset period; or, Gradually adjust the operating power of the electromagnetic heating device from large to small according to a first preset period.

[0007] In one embodiment, determining the number of heating time periods according to the non-drop-wave continuous heating power and the target minimum power, and determining the total duration of the corresponding number of determined heating time periods as the heating cycle includes: Determine a first ratio of the non-drop-wave continuous heating power to the target minimum power; Obtain the number of heating time periods corresponding to the first ratio; Calculate the total duration of the obtained corresponding number of heating time periods to obtain the heating cycle.

[0008] In one embodiment, the electromagnetic heating device control method further includes: Obtain the current input frequency and determine the current input cycle corresponding to the current input frequency; Determine the duration corresponding to the heating time period according to the duration corresponding to the current input cycle.

[0009] In one embodiment, determining the duration corresponding to the heating time period according to the duration corresponding to the current input cycle includes: Obtain the half-wave cycle of the current input cycle and determine the duration of the half-wave cycle; Configure the duration of the half-wave cycle as the duration corresponding to the heating time period.

[0010] In one embodiment, determining the required number of heating time periods according to the target power and the target minimum power, and controlling the electromagnetic heating device to operate at the non-drop-wave continuous heating power according to the determined number of heating time periods within the heating cycle includes: Calculate a second ratio of the target power to the target minimum power; According to the second ratio, determine the number of heating time periods corresponding to the second ratio within the heating cycle as the target heating time periods; Control the electromagnetic heating device to operate at the non-drop-wave continuous heating power during the target heating time periods.

[0011] In one embodiment, controlling the electromagnetic heating device to operate at the non-drop-wave continuous heating power during the target heating time periods further includes: Classify the heating time periods within the heating cycle into the target heating time periods and non-target heating time periods; Sort the target heating time periods and the non-target heating time periods in a first sorting order within the heating cycle; Control the electromagnetic heating device to operate at the non-drop-wave continuous heating power in sequence during the target heating time periods.

[0012] The present invention also provides a control device for an electromagnetic heating device, which is used to implement the electromagnetic heating device control method as described in any one of the above.

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

[0014] In summary, the electromagnetic heating device control method provided by the present invention can achieve continuous low-power heating of the electromagnetic heating device, improving the user experience. The method includes obtaining the duration of the heating time period, and then calculating how many heating time periods make up a heating cycle according to the non-drop-wave continuous heating power and the target minimum power. Finally, loop within the heating cycle, and control the electromagnetic heating device to operate at the non-drop-wave continuous heating power for the corresponding number of heating time periods according to the target power, so that the current power of the electromagnetic heating device can approach the target power. It can be understood that since the heating cycle is determined by the non-drop-wave continuous heating power and the target minimum power, every time the electromagnetic heating device works at the non-drop-wave continuous heating power for one heating time period in the heating cycle, it means that the current power is one target minimum power. Therefore, the number of heating time periods that need to be heated in the heating cycle can be determined according to the target power to reach the target power. In this way, through the non-drop-wave continuous heating power, continuous low-power heating can be achieved as much as possible while ensuring no hard turn-on, thereby meeting the requirement of continuous low-power operation, making the electromagnetic heating device heat more evenly during low-power operation, and improving the user experience. Description of the Drawings

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

[0016] Figure 1 It is a flowchart of the first embodiment of the electromagnetic heating device control method provided by the present invention; Figure 2 It is a flowchart of the second embodiment of the electromagnetic heating device control method provided by the present invention; Figure 3 It is a flowchart of the third embodiment of the electromagnetic heating device control method provided by the present invention; Figure 4 It is a flowchart of the fourth embodiment of the electromagnetic heating device control method provided by the present invention; Figure 5Flowchart of the fifth embodiment of the electromagnetic heating device control method provided by the present invention; Figure 6 Flowchart of the sixth embodiment of the electromagnetic heating device control method provided by the present invention; Figure 7 Flowchart of the seventh embodiment of the electromagnetic heating device control method provided by the present invention; Figure 8 Flowchart of the eighth embodiment of the electromagnetic heating device control method provided by the present invention; Figure 9 Waveform diagram of the heating time period and the heating cycle.

[0017] 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

[0018] 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0019] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0020] 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, etc. during specific implementation, but these should all be within the protection scope of the present invention.

[0021] The single-tube induction cooker in the existing technology can only reach half of its rated maximum power when performing continuous heating without wave loss. For example, an induction cooker with a maximum power of 2000W can achieve continuous heating without wave loss at 1000W. If it is less than 1000W, it will suffer from severe hard-on, causing damage to the power switch of the induction cooker and affecting its service life. However, users need to operate the induction cooker at low power in many cases, such as for heat preservation, solid-state liquefaction, etc. Therefore, when trying to heat at a lower power, the power switch faces hard-on when it is turned on, resulting in higher turn-on losses and serious heating problems, increasing the risk of damage to the power switch.

[0022] Therefore, to prevent this from happening, existing induction cookers typically do not use continuous heating mode when operating at low power. Most induction cookers on the market use intermittent heating to maintain the required temperature at low power. This means the cooker will stop heating for a period of time after a period of operation. These pauses are often long, typically exceeding 10 seconds. These long pauses cause the surface temperature of the food to drop significantly, resulting in uneven heating. This is particularly detrimental for cooking activities that require precise heat control, such as pancakes and steak, as it can easily lead to overcooking or undercooking of certain areas. Furthermore, for low-temperature cooking activities that require a constant temperature, such as melting chocolate, it can cause the food to burn.

[0023] In summary, current induction cooker technology faces challenges at multiple levels when dealing with low-power heating needs, from hardware limitations to actual usage effects, resulting in poor user experience.

[0024] Therefore, in order to improve the low-power usage experience of electromagnetic heating equipment, the present invention provides a control method for electromagnetic heating equipment.

[0025] It is understandable that the electromagnetic heating equipment can be an induction cooker, an induction stove, an electromagnetic heating rice cooker, an electromagnetic heating stove, etc. The specific product of the electromagnetic heating equipment is not limited here.

[0026] In one embodiment, if Figure 1 As shown, the electromagnetic heating equipment control method includes steps S100 to S300.

[0027] In this embodiment, step S100 obtains the continuous heating power without wave loss and the target minimum power, and determines the number of heating time periods based on the continuous heating power without wave loss and the target minimum power, and determines the total duration of the corresponding number of heating time periods as the heating cycle.

[0028] It can be understood that the heating time period is the smallest time unit in the heating cycle, that is, multiple heating time periods can be combined into one heating cycle. In the heating cycle of this embodiment, it is equal to the sum of the times of the number of heating time periods determined according to the continuous non-drop power of electromagnetic heating and the target minimum power. During the heating time period, the electromagnetic heating device can continuously perform at least one complete heating operation. A complete operation means that under the action of alternating current, the corresponding average power can be accurately calculated within this heating time period. After obtaining the duration of the heating time period, the electromagnetic heating device can flexibly adjust the working mode according to different usage requirements and heating tasks.

[0029] It can be understood that based on the continuous non-drop power of electromagnetic heating and the target minimum power, a suitable heating cycle can be calculated. The heating cycle refers to the time length required to complete one complete heating process. The length of the heating cycle directly affects the heating efficiency and temperature stability. The average temperature within this heating cycle is the target temperature set by the user.

[0030] It should be explained that the continuous non-drop power of electromagnetic heating refers to the minimum power level at which the electromagnetic heating device can continuously and stably operate without power loss. Specifically, this is the threshold power at which the power switch can operate safely. When the electromagnetic heating device operates at this power level, it can ensure that there are fewer hard turn-on phenomena during the start-up process of the power switch (hard turn-on means that the voltage across the power switch is relatively high during startup, which is likely to cause damage). Therefore, if the electromagnetic heating device attempts to operate below this continuous non-drop power of electromagnetic heating, hard turn-on will occur, which will damage the power switch. The purpose of step S100 is to determine this continuous non-drop power of electromagnetic heating to identify the lowest power limit at which the electromagnetic heating device can stably operate. In this way, it is beneficial to ensure a more uniform and stable heating effect while meeting the user's demand for continuous low-power heating.

[0031] It also needs to be explained that the target minimum power is the lowest heating power expected by the user, that is, the lowest set power of the user. From the user's perspective, the target minimum power intuitively represents the lowest heating power that the user expects the electromagnetic heating device to achieve. It is a key power threshold set by the user based on their own usage intention when operating the device, that is, the lowest set power of the user.

[0032] Among them, the target minimum power is often lower than the continuous non-drop power of electromagnetic heating. Therefore, when the user uses the target minimum power as the set power, in the prior art, by heating intermittently, the average power of the electromagnetic heating device within a period of time is made as close as possible to the set power, which also leads to uneven heating.

[0033] It should be noted that the heating cycle consists of several heating time periods. Based on the continuous non-drop power and the target minimum power, the corresponding number of heating time periods can be obtained. Combining these multiple heating time periods forms a heating cycle. In a feasible embodiment, the continuous non-drop power is 1000W, and the target minimum power is 50W. Dividing the continuous non-drop power by the target minimum power gives 1000W divided by 50W, with a result of 20. Thus, it can be determined that the heating cycle consists of 20 heating time periods.

[0034] In this embodiment, in step S200, the target power is obtained.

[0035] Among them, the target power can be actively set by the user, that is, the power value set by the user, which can be achieved through the interaction component, wireless communication component, etc. of the electromagnetic heating device; the target power can also be the power value adaptively adjusted during the operation of the electromagnetic heating device, such as the target power adaptively set according to the current heating demand. Of course, there are other methods for setting the target power, which will not be listed one by one here. The specific setting method of the target power is not specifically limited here, and it can be the final power that the electromagnetic heating device needs to reach.

[0036] In this embodiment, in step S300, the number of required heating time periods is determined according to the target power and the target minimum power. During the heating cycle, the electromagnetic heating device is controlled to operate at the continuous non-drop power according to the determined number of heating time periods.

[0037] It's worth noting that if, within the multiple heating time periods determined based on the zero-dropout continuous heating power and the target minimum power, any heating time period operates at the zero-dropout continuous heating power, the average power of the electromagnetic heating device over the entire corresponding heating cycle will be the zero-dropout continuous heating power divided by the total number of heating time periods in that heating cycle. In other words, within a heating cycle, as long as one heating time period operates at the zero-dropout continuous heating power while the remaining heating time periods are idle, the average power for the entire cycle will be the maximum stable power distributed across all heating time periods. Similarly, if zero-dropout continuous heating power is used during any two heating time periods, while the remaining heating time periods are idle, the average power for that heating cycle will be twice the average power of a single heating time period. This is because both heating time periods operate at the maximum stable power, while the remaining heating time period is idle, resulting in the average power being doubled compared to a scenario where only one heating time period is active. Thus, by adjusting the number of heating time periods active within each heating cycle, different average power output levels can be achieved to meet the user's target power requirements. For example, when a lower average power is required, fewer heating time periods may be selected to operate at a continuous heating power without wave loss; conversely, if a higher average power is required, the number of operating heating time periods may be increased.

[0038] In some exemplary electromagnetic heating device control methods, intermittent heating is often used to achieve continuous low-power heating. However, due to the long off-time (typically exceeding 10 seconds), this can easily lead to large temperature fluctuations. However, this method divides the heating cycle into multiple shorter heating time periods (e.g., milliseconds or microseconds), significantly shortening the time interval between heating and off-time, thereby effectively reducing temperature fluctuations. By flexibly adjusting the number of heating time periods within each cycle, the user's low-power requirements can be precisely matched, ensuring that the actual operating power is as close to the target power as possible. However, in this method, the electromagnetic heating device always operates at a continuous heating power with no dropouts, even in a low-power state. The average power output is reduced by reducing the number of heating time periods. This fundamentally avoids the hard-turn-on problem and extends the service life of the power switch. More importantly, this method enables the electromagnetic heating device to operate at a continuous heating power with no dropouts for a specific number of heating time periods within each heating cycle, achieving periodic heating. Since each heating time period lasts for a short time, it can effectively reduce the problem of food surface temperature fluctuations caused by long pauses in traditional intermittent heating, making the heat distribution more balanced, thereby avoiding local overheating or insufficient heating and improving the user experience.

[0039] It should be noted that when the electromagnetic heating device operates at a continuous heating power with zero dropouts, the average power within the duration of the heating period must correspond to this continuous heating power with zero dropouts. Since the input of the electromagnetic heating device is connected to AC power, the voltage presents a half-wave waveform after passing through the rectifier and filter circuits. In this case, the power output is also associated with this half-wave waveform. When the electromagnetic heating device operates at a continuous heating power with zero dropouts, the average power of each half-wave should be equal to this continuous heating power with zero dropouts. If the duration is not selected correctly, certain key data points may be missed, such as only collecting data at the trough or peak of the wave, rather than the complete half-wave waveform. This will cause the actual power output to differ from expectations, thereby affecting the heating effect and device performance. Therefore, the duration of the heating period is determined to be a multiple of the half-wave so that the average power of the heating period can fully reflect the continuous heating power with zero dropouts.

[0040] In one feasible embodiment, the non-dropout continuous heating power is 1000W, while the target minimum power is 50W, and the target power is 150W. A heating cycle is determined to consist of 20 heating time periods (derived by the ratio of the non-dropout continuous heating power to the target minimum power). Next, for a target power of 150W, the electromagnetic heating device must operate at 1000W for three heating time periods within each heating cycle, and remain idle for the remaining 17 heating time periods. This ensures that the average power throughout the heating cycle remains stable at 150W, while also preventing damage to the power switch caused by hard switching. Furthermore, because the heating time periods are short and evenly distributed, heat output is more stable, effectively reducing temperature fluctuations. This results in efficient, uniform, low-power heating, satisfying the user's need for precise power control.

[0041] In summary, the electromagnetic heating device control method provided by the present invention can achieve continuous low-power heating of the electromagnetic heating device, improving the user experience. Among them, the method includes obtaining the duration of the heating time period, and then calculating how many heating time periods make up a heating cycle according to the non-drop-wave continuous heating power and the target minimum power. Finally, loop within the heating cycle, and control the electromagnetic heating device to operate at the non-drop-wave continuous heating power for the corresponding number of the heating time periods according to the target power, so that the current power of the electromagnetic heating device can approach the target power. It can be understood that since the heating cycle is determined by the non-drop-wave continuous heating power and the target minimum power, every time the electromagnetic heating device works at the non-drop-wave continuous heating power for one heating time period in the heating cycle, it means that the current power is one target minimum power. Therefore, the number of heating time periods that need to be heated in the heating cycle can be determined according to the target power to reach the target power. In this way, through the non-drop-wave continuous heating power, it is possible to achieve continuous low-power heating as much as possible while ensuring no hard turn-on, thereby meeting the requirements of continuous low-power operation, making the electromagnetic heating device heat more evenly during low-power operation, and improving the user experience.

[0042] In one embodiment, as Figure 2 shown, step S100 further includes step S110 and step S120, and step S110 and step S120 are used to determine the non-drop-wave continuous heating power that appears in step S100.

[0043] In this embodiment, in step S110, the operating power of the electromagnetic heating device is adjusted successively according to the first preset period, and the number of hard turn-ons of the electromagnetic heating device within each first preset period is counted.

[0044] Among them, the hard turn-on means that when the power switch of the electromagnetic heating device is turned on, the terminal voltage of the power switch is greater than the first preset voltage.

[0045] It can be understood that in order to determine the non-drop-wave continuous heating power, it is first necessary to identify the frequency of hard turn-on phenomena that occur in the electromagnetic heating device at different power levels. Hard turn-on refers to the situation where the terminal voltage of the power switch of the electromagnetic heating device exceeds the first preset voltage when it is turned on. This situation may cause damage to the power switch and affect the stability and lifespan of the device. Therefore, in step S120, the control system adjusts the operating power of the electromagnetic heating device successively according to the first preset period, and at the same time, it detects and records in real time whether the terminal voltage exceeds the preset safety threshold each time the power switch is turned on. In this way, the control system can accurately measure and record the number of hard turn-ons at different power settings, providing data support for subsequent determination of the optimal non-drop-wave continuous heating power.

[0046] In this embodiment, in step S120, when the number of hard turn - ons accumulated in any first preset period reaches the first number preset value, the operating power of the current first preset period is determined as the continuous heating power without wave loss.

[0047] It can be understood that when the hard turn - on count in step S110 reaches a preset threshold (i.e., the first number preset value), it indicates that the operating power at this time has approached or reached the limit at which the power switch can operate safely. At this critical point, increasing or decreasing the power further will increase the risk of hard turn - on, which may damage the device. Therefore, in step S120, the operating power just before reaching the hard turn - on count threshold is defined as the continuous heating power without wave loss, ensuring that the electromagnetic heating device can continuously operate at the highest safe power without causing hard turn - on. In this way, it is possible to avoid damage to the power switch due to frequent hard turn - ons, and also maximize the heating efficiency and uniformity of the device in the low - power state, providing a more reliable and efficient heating experience for users.

[0048] It should be noted that when the number of hard turn - ons accumulated reaches the first number preset value, it means that the number of hard turn - ons accumulated in a certain first preset period reaches the first number preset value. After reaching the first number preset value, the adjusted operating power corresponding to the current first preset period is determined as the continuous heating power without wave loss.

[0049] Among them, the first preset period can be set according to the requirements of the actual application scenario, and its purpose is to ensure that the system has enough time to fully detect and count the hard turn - on situations at different power levels. The first number preset value is also set depending on the specific application scenario and the design requirements of the device, and is a counting threshold used to judge whether the hard turn - on phenomenon reaches the critical point.

[0050] In one embodiment, as Figure 3 shown, step S110 further includes step S111 or step S112.

[0051] In this embodiment, in step S111, the operating power of the electromagnetic heating device is adjusted from small to large according to the first preset period.

[0052] In this embodiment, in step S112, the operating power of the electromagnetic heating device is adjusted from large to small according to the first preset period.

[0053] It can be understood that whether adjusting from small to large or from large to small, the core goal is to determine the continuous heating power without wave loss. Although these two methods have different adjustment directions, their ultimate purpose is to find the critical point at which the power switch can operate safely by monitoring the change in the number of hard turn - ons. This ensures that the electromagnetic heating device can avoid damage to the hardware caused by hard turn - on phenomena during low - power operation and achieve efficient and stable heating effects.

[0054] In the specific implementation process, which adjustment method to choose mainly depends on the actual application scenario and test requirements. For example, if you want to gradually approach the continuous heating power without wave loss in a more stable way, you can choose the adjustment method from small to large; while if you need to quickly locate the problem area and reduce the test time, you can choose the adjustment method from large to small.

[0055] It should be explained that through this method, the electromagnetic heating device can detect the hard turn - on situation in real time to cope with the influence of different pot materials and shapes on the hard turn - on voltage. Since the electromagnetic characteristics of different pots are different, their corresponding hard turn - on voltage thresholds will also be different. Therefore, the traditional fixed preset continuous heating power without wave loss may not be applicable to all scenarios. To solve this problem, the control system can dynamically adjust the continuous heating power without wave loss. By continuously reducing the operating power, it gradually approaches the lowest limit at which the power switch can operate safely. During this process, the control system will monitor the occurrence frequency and intensity of hard turn - on phenomena in real time until the hard turn - on situation is no longer obvious or completely disappears. The operating power corresponding to this time is determined as the lowest continuous heating power without wave loss. This method can not only adapt to the characteristics of various pots, but also maximize the stability of the device during low - power operation, while ensuring heating efficiency and uniformity, thus optimizing the user experience.

[0056] In one embodiment, as Figure 4 shown, step S100 further includes steps S130 to S150, and steps S130 to S150 are used to calculate the heating cycle according to the continuous heating power without wave loss and the target minimum power.

[0057] In this embodiment, step S130 determines the first ratio of the continuous heating power without wave loss and the target minimum power.

[0058] It can be understood that the first ratio can be obtained by dividing the continuous heating power without wave loss by the target minimum power, or by dividing the target minimum power by the continuous heating power without wave loss. For example, if the continuous heating power without wave loss is 1000W and the target minimum power is 50W, then the first ratio is 1000W:50W = 20. The first ratio actually reflects how many minimum working units (i.e., heating time periods) need to be divided to achieve the conversion from the maximum stable power to the minimum power expected by the user.

[0059] In this embodiment, step S140: Obtain the number of heating time periods corresponding to the first ratio.

[0060] It can be understood that step S140 determines how many heating time periods are required to form a complete heating cycle according to the first ratio calculated in step S130. In this example, if the first ratio is 20, it means that a heating cycle should consist of 20 heating time periods. The electromagnetic heating device can perform at least one complete heating operation within each heating time period. In this way, it is possible to ensure flexible control of the actual output power of the electromagnetic heating device, making it as close as possible to the target power set by the user.

[0061] In this embodiment, step S150: Calculate the total duration of the obtained corresponding number of heating time periods to obtain the heating cycle.

[0062] It can be understood that in step S150, the total duration of the entire heating cycle is calculated by summing up the durations of the obtained corresponding number of heating time periods. Since each heating time period has its specific duration (usually in milliseconds or microseconds), adding the durations of these heating time periods can obtain the length of a complete heating cycle. This helps to precisely control the working mode of the electromagnetic heating device, ensuring that it can meet the user's different power requirements while minimizing temperature fluctuations caused by intermittent heating, providing a more uniform and stable heating effect, and thus enhancing the user experience.

[0063] In a feasible embodiment, the continuous heating power without wave loss of the electromagnetic heating device is 1000W, the target minimum power expected by the user is 50W, and the duration of each heating time period is set to 50 milliseconds. First, by calculation, the ratio of the continuous heating power without wave loss to the target minimum power is 20, which means that a complete heating cycle needs to consist of 20 heating time periods. Then, according to the duration of each heating time period being 50 milliseconds, the total duration of the entire heating cycle can be obtained as 1 second (i.e., 20 heating time periods multiplied by 50 milliseconds per unit). In this way, the electromagnetic heating device can precisely match the target power set by the user by flexibly adjusting the number of heating time periods operating at 1000W within a 1-second heating cycle. For example, when the target power is 50W, just let the electromagnetic heating device work at the continuous heating power without wave loss in one of the 20 heating time periods, and the remaining 19 units rest; when the target power is 100W, let the electromagnetic heating device work at the continuous heating power without wave loss in two of the 20 heating time periods, and the remaining 18 units rest. In this way, the damage caused by hard switching is avoided, and at the same time, the temperature fluctuation is reduced, significantly improving the heating effect and user experience.

[0064] In one embodiment, as Figure 5 shown, the electromagnetic heating device control method further includes step S400 and step S500.

[0065] In this embodiment, step S400, obtain the current input frequency and determine the current input period corresponding to the current input frequency.

[0066] It can be understood that the control system first needs to obtain the current input frequency of the electromagnetic heating device. This input frequency usually refers to the power frequency provided by the AC power supply, such as the common 50Hz or 60Hz. According to this input frequency, the time length of the current input period can be further calculated. The input period refers to the time required to complete a complete voltage waveform (from one peak to the next same peak), and it is the reciprocal of the frequency. For example, for an input frequency of 50Hz, the corresponding input period is 1 / 50 second, that is, 20 milliseconds; for an input frequency of 60Hz, it corresponds to 1 / 60 second, approximately equal to 16.67 milliseconds. Through this step, the system can accurately understand the basic time unit under the current power supply conditions and provide basic data for subsequent operations.

[0067] In this embodiment, step S500, determine the duration corresponding to the heating time period according to the duration corresponding to the current input period.

[0068] It is understandable that since the working efficiency and stability of the electromagnetic heating device are closely related to the characteristics of the input power supply, it is crucial to select an appropriate duration for the heating time period. The heating time period is the smallest working time unit. During this stage, the control system determines the optimal duration of the heating time period based on relevant information of the input cycle, so as to ensure that at least one complete heating operation can be performed within the optimized time frame for each heating time period, thereby guaranteeing the efficiency and uniformity of the heating process.

[0069] In one embodiment, as Figure 6 shown, step S500 further includes step S510 and step S520.

[0070] In this embodiment, step S510, obtain the half-wave period of the current input cycle and determine the duration of the half-wave period.

[0071] It is understandable that in an AC power environment, the direction of the current changes periodically, forming positive and negative half-waves. Obtain the half-wave period and determine its corresponding duration. Taking 50Hz as an example, the entire input cycle is 20 milliseconds, so a single half-wave period is 10 milliseconds. The importance of the half-wave period lies in that it can accurately summarize the current average power and its duration is very short.

[0072] In this embodiment, step S520, configure the duration of the half-wave period as the duration corresponding to the heating time period.

[0073] It is understandable that since the power output of the electromagnetic heating device is closely related to the half-wave waveform of the input power supply, the rectified and filtered voltage presents a half-wave form, and the power distribution within each half-wave period is relatively stable. If the duration of the heating time period is not an integer multiple of the half-wave period, it may cause some waveforms to be truncated or missed, resulting in data loss or unstable power output. For example, if the duration of the heating time period is too short, it may only cover the peak or trough part of the waveform and cannot reflect the true power level of the entire half-wave period; while if the duration is too long, it may include multiple incomplete half-waves, causing power calculation deviation. By selecting the half-wave period as the basic duration of the heating time period, the power characteristics within each half-wave can be completely captured, avoiding the occurrence of the above problems, thereby ensuring the accuracy and stability of the power output, and at the same time laying a reliable foundation for achieving uniform heating during low-power operation.

[0074] In addition, since a half-wave is used as the heating time period, its duration is very short (for example, in 50Hz alternating current, each half-wave cycle is only 10 milliseconds). This makes the duration of the entire heating cycle very short as well, usually controllable within a time range of 200 milliseconds or even shorter. Due to the high switching frequency of the heating time period, far exceeding the perception ability of the human senses, users can hardly perceive the existence of intermittent heating, thus achieving a continuous low-power operation effect in terms of the senses. At the same time, this short-cycle design effectively reduces the temperature fluctuation problem caused by long-time pauses in traditional intermittent heating, makes the heat distribution more uniform, avoids local overheating or insufficient heating, and significantly improves the user experience.

[0075] Of course, in other embodiments, the duration of the heating time period can also be the duration corresponding to two half-waves, or the duration corresponding to three half-waves. Specifically, how many half-waves it consists of depends on the actual application requirements. The smaller the duration of the heating time period, the shorter the heating cycle, and the more difficult it is for humans to perceive. Of course, the heating of food will also be more uniform.

[0076] It should be particularly noted that by determining the heating time period through frequency, it is also possible to cope with power supply differences in different regions, ensuring the compatibility and stability of the device globally. Since the power grid frequencies vary around the world (for example, 50Hz is mostly used in China and Europe, while 60Hz is used in the United States and some other countries), electromagnetic heating devices need to be able to adapt to these different input frequencies. By calculating the duration of the heating time period based on the input frequency, the device can flexibly adjust its working cycle to match the local power supply conditions. In this way, by determining the heating time period through frequency, problems such as unstable power output or reduced efficiency caused by frequency mismatch are avoided, and precise power control can be ensured for the device in any region, enabling users to enjoy a consistent and reliable heating experience regardless of where they are.

[0077] In a feasible embodiment, as Figure 9 shown, if the current input cycle is 50Hz, then the half-wave cycle is 10ms, and the duration of the heating time period is equal to the half-wave cycle. Of course, the half-wave cycle can be set as the heating time period, or it can just be that the duration of the heating time period is equal to the half-wave cycle. In addition, if the continuous heating power without wave loss is 1200W and the lowest target power is 50W, then there are a total of 24 heating time periods that make up the heating cycle, each heating time period corresponding to 10ms, and a heating cycle is 240ms. Therefore, when the target power is 50W, it can correspond to heating one heating time period in this heating cycle, as Figure 9For the shaded part in [the figure], the corresponding heating time period is [as described], and the power of the other 23 heating time periods is 0, so the power corresponding to this heating cycle is 50W; when the target power is 100W, it can correspond to heating two heating time periods in this heating cycle, and the power of the other 22 heating time periods is 0, so the power corresponding to this heating cycle is 100W.

[0078] In one embodiment, as Figure 7 shown, step S300 includes step S310 to step S330.

[0079] In this embodiment, step S310, calculate the second ratio of the target power and the target minimum power.

[0080] It can be understood that the second ratio can be obtained by dividing the target power by the target minimum power, or by dividing the target minimum power by the target power. For example, if the target power set by the user is 150W and the target minimum power of the device is 50W, then the second ratio is 150W:50W = 3. The second ratio represents the heating effect expected by the user and how many minimum units (i.e., heating time periods) are needed to combine to achieve this target power. By calculating this ratio, the control system can accurately understand how many heating time periods need to be activated to meet the user's power demand.

[0081] In this embodiment, step S320, according to the second ratio, determine the number of heating time periods corresponding to the second ratio in the heating cycle as the target heating time periods.

[0082] It can be understood that step S320, based on the second ratio calculated in step S310, further determines the specific number of heating time periods that need to be activated in the heating cycle. In one implementation, if the second ratio is 3, it means that in the entire heating cycle, three heating time periods will be selected as the target heating time periods.

[0083] In this embodiment, step S330, control the electromagnetic heating device to work at the non-drop-wave continuous heating power in the target heating time periods.

[0084] It can be understood that during a heating cycle, the electromagnetic heating device will operate continuously at a constant heating power without interruption during each selected target heating time period, while remaining idle during the remaining heating time periods. This approach allows the user's set target power to be achieved throughout the entire heating cycle. For example, if a heating cycle consists of 20 heating time periods, and the second ratio determines that three target heating time periods are required, the device will operate at 1000W during these three periods and remain idle for the remaining 17 periods, ensuring that the average power is close to the user's set target power. This approach not only ensures accurate power output but also avoids damage to the power switch caused by hard-turn-on, thereby improving the device's lifespan and heating efficiency. Furthermore, because the heating time periods are very short, this intermittent operation appears virtually seamless to the user, providing a more uniform and stable heating experience.

[0085] In one embodiment, if Figure 8 As shown, step S330 also includes steps S331 to S333.

[0086] In this embodiment, step S331 , the heating time periods in the heating cycle are classified into the target heating time periods and the non-target heating time periods.

[0087] It is understandable that the control system first needs to classify the heating time periods within the entire heating cycle, clarifying which are the target heating time periods and which are the non-target heating time periods. The target heating time period refers to those units that operate at a continuous heating power without wave loss during the heating cycle, while the non-target heating time period refers to the units that are not working or are in a dormant state during the cycle. For example, assuming that a heating cycle consists of 20 heating time periods, and 3 target heating time periods are required based on the target power set by the user, then of these 20 heating time periods, 3 will be marked as target heating time periods, and the remaining 17 will be non-target heating time periods. This classification method provides the basis for the subsequent precise control of the working mode of the electromagnetic heating equipment.

[0088] In this embodiment, step S332 , within the heating cycle, the target heating time period and the non-target heating time period are sorted in a first arrangement order.

[0089] It can be understood that the target heating time periods and non-target heating time periods are sorted according to a specific first arrangement order. This arrangement order determines the position and sequence of each heating time period in the entire heating cycle, thereby affecting the uniformity and efficiency of the heating process. For example, a possible first arrangement order could be to insert a target heating time period after every several non-target heating time periods, i.e., "non-non-non-aim-non-non-non-aim..." (non refers to non-target heating time periods; aim refers to target heating time periods). Among them, this way of interval distribution helps to reduce temperature fluctuations. In this way, not only can the heating effect be optimized, but also the risk of hard switching phenomenon can be effectively reduced, protecting the power switch.

[0090] In this embodiment, in step S333, control the electromagnetic heating device to operate at the non-drop-wave continuous heating power in sequence during the target heating time periods.

[0091] It can be understood that in step S333, the control system controls the electromagnetic heating device to operate at the non-drop-wave continuous heating power in sequence during the target heating time periods according to the determined first arrangement order. That is to say, in each heating cycle, the electromagnetic heating device will activate the target heating time periods in the predetermined first arrangement order and remain in a standby state during the non-target heating time periods. For example, if the arrangement order of "non-non-non-aim-non-non-non-aim..." (non refers to non-target heating time periods; aim refers to target heating time periods) is adopted, then in a heating cycle containing 20 heating time periods, the electromagnetic heating device will operate at a power of 1000W during the target heating time periods at positions 4, 8, 12, etc., and will not work at other positions. This orderly switching mechanism not only ensures the accuracy of power output but also makes it almost imperceptible to the user's senses that there is intermittent heating, achieving an almost continuous low-power operation effect and significantly improving the user experience.

[0092] It should be noted that the specific form of this first arrangement order is not limited here. It can be to connect multiple target heating time periods continuously, i.e., "non-non-non-aim-aim-aim-non-non-non", or it can be evenly distributed target heating time periods and non-target heating time periods, i.e., "non-non-non-aim-non-non-non-aim...".

[0093] In one possible embodiment, an induction cooker has a non-dropout continuous heating power of 1000W and a target minimum power of 50W. The user desires heating at a power of 150W (i.e., the target power). The input power frequency is 50Hz, and each half-wave period is 10 milliseconds, so each heating period is set to 10 milliseconds. Based on this, the control system first calculates that a complete heating cycle consists of 20 heating periods (1000W:50W=20), with a total heating cycle duration of 200 milliseconds (20 x 10ms). To achieve the user-set target power of 150W, the control system calculates that three target heating periods need to be activated within each heating cycle (150W:50W=3), while the remaining 17 heating periods remain inactive. In actual operation, the control system arranges these target heating periods in a uniform distribution, such as "non-non-non-me-non-non-non-me-non-non-non-me-non-non-non-me-non-non-non-non-non-non-non-non-non-non-non-non-non," to ensure smoother and more uniform heat output. Following this sequence, the induction cooker operates at a continuous, non-dropout 1000W heating power during each target heating period, while completely stopping heating during non-target heating periods. Because each heating period lasts just 10 milliseconds, the user is barely aware of the intermittent heating, achieving near-continuous, low-power operation.

[0094] It is understood that, when the electromagnetic heating device is an induction cooker, this method, by employing a short, intermittent heating mode, can effectively address the problems of uneven heating, localized overcooking or undercooking, and burnt food that can occur with conventional induction cookers operating at low power. Unlike most commercial induction cookers, which use long pauses (typically exceeding 10 seconds), resulting in significant temperature drops and uneven heating, this method sets each heating period to an extremely short duration (e.g., 10 milliseconds) and evenly distributes the target heating period throughout a complete heating cycle. This allows the induction cooker to operate at a continuous, non-dropout heating power for a short period of time before quickly switching to a pause mode, thus avoiding the localized overheating caused by prolonged, high-power heating. Because the intervals are so short, the power transitions are smooth, preventing drastic fluctuations in the food surface temperature. During high power conditions, the induction cooker can quickly deliver the required heat, while the brief pauses between cycles allow the heat to spread evenly, preventing localized overheating. Furthermore, this method is particularly suitable for low-temperature cooking applications requiring constant temperature control, such as melting chocolate, as it maintains a stable temperature and avoids burnt food caused by sudden temperature drops. Therefore, when operating at low power, this method not only ensures uniform and stable heating, but also provides more precise heat control, improving the overall cooking experience.

[0095] The present invention further provides a control device for an electromagnetic heating device. The control device for the electromagnetic heating device includes a unit calculation circuit, a period calculation circuit, and a control circuit. The unit calculation circuit is electrically connected to a power supply terminal. The period calculation circuit is configured to calculate the heating time period. The period calculation circuit is configured to obtain the continuous non-drop-wave heating power and the target minimum power, and determine the total duration of the corresponding number of heating time periods based on the continuous non-drop-wave heating power and the target minimum power as the heating period. The control circuit is electrically connected to the unit calculation circuit and the period calculation circuit. The control circuit is configured to control the electromagnetic heating device to operate at the continuous non-drop-wave heating power within the corresponding number of heating time periods according to the target power and the target minimum power during the heating period.

[0096] In a feasible implementation manner, the electromagnetic heating device further includes a power switch and a switch driving circuit. The switch driving circuit is configured to drive the power switch, and the switch driving circuit is connected to the control circuit. After the unit calculation circuit and the period calculation circuit determine the heating time period and the heating period, the control circuit can output a corresponding drop-wave heating signal to the switch driving circuit according to the electromagnetic heating device control method described in any one of the above, so that the switch driving circuit drives the power switch, thereby realizing continuous low-power heating and enhancing the user experience.

[0097] The present invention further proposes an electromagnetic heating device. The electromagnetic heating device includes a control device for the electromagnetic heating device. The control device for the electromagnetic heating device is configured to implement the electromagnetic heating device control method. The specific implementation manners of the electromagnetic heating device control method refer to the above embodiments. Since this electromagnetic heating device adopts all the technical solutions of 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 herein one by one.

[0098] It can be understood that the electromagnetic heating device can be an induction cooker, an electromagnetic oven, an electromagnetic stove, an electromagnetic heating rice cooker, an electromagnetic heating furnace, etc. The specific product of the electromagnetic heating device is not limited herein.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention 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 invention, and they should all be covered within the scope of the claims and the description of the present invention. 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 invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A control method for an electromagnetic heating device, characterized in that The control method for the electromagnetic heating device includes: Obtaining the continuous heating power without wave loss and the target minimum power, and determining the number of heating time periods according to the continuous heating power without wave loss and the target minimum power, and determining the total duration of the corresponding number of heating time periods as the heating cycle; Obtaining the target power; Determining the required number of heating time periods according to the target power and the target minimum power, and within the heating cycle, controlling the electromagnetic heating device to operate at the continuous heating power without wave loss according to the determined number of heating time periods.

2. The electromagnetic heating device control method according to claim 1, characterized in that, The obtaining of the continuous heating power without wave loss includes: Successively adjusting the operating power of the electromagnetic heating device according to a first preset period, and counting the number of hard turn - ons of the electromagnetic heating device within each first preset period; the hard turn - on means that when the power switch of the electromagnetic heating device is turned on, the terminal voltage of the power switch is greater than a first preset voltage; When the number of hard turn - ons accumulated within any one first preset period reaches a first preset value, determining the operating power of the current first preset period as the continuous heating power without wave loss.

3. The control method of the electromagnetic heating device according to claim 2, characterized in that, The successively adjusting the operating power of the electromagnetic heating device according to a first preset period includes: Adjusting the operating power of the electromagnetic heating device from small to large according to a first preset period; or, Adjusting the operating power of the electromagnetic heating device from large to small according to a first preset period.

4. The electromagnetic heating device control method according to claim 1, characterized in that, The determining the number of heating time periods according to the continuous heating power without wave loss and the target minimum power, and determining the total duration of the corresponding number of heating time periods as the heating cycle includes: Determining a first ratio of the continuous heating power without wave loss and the target minimum power; Obtaining the corresponding number of heating time periods for the first ratio; Calculating the total duration of the obtained corresponding number of heating time periods to obtain the heating cycle.

5. The control method of the electromagnetic heating device according to claim 1, characterized in that, The control method for the electromagnetic heating device further includes: Obtaining the current input frequency and determining the current input cycle corresponding to the current input frequency; Determining the duration corresponding to the heating time period according to the duration corresponding to the current input cycle.

6. The electromagnetic heating device control method according to claim 5, wherein The determining the duration corresponding to the heating time period according to the duration corresponding to the current input cycle includes: Obtaining the half - wave cycle of the current input cycle and determining the duration of the half - wave cycle; Configuring the duration of the half - wave cycle as the duration corresponding to the heating time period.

7. The electromagnetic heating device control method according to any one of claims 1 to 6, characterized in that The determining the required number of heating time periods according to the target power and the target minimum power, and within the heating cycle, controlling the electromagnetic heating device to operate at the continuous heating power without wave loss according to the determined number of heating time periods includes: Calculating a second ratio of the target power and the target minimum power; According to the second ratio, determining the corresponding number of heating time periods within the heating cycle as the target heating time periods; Controlling the electromagnetic heating device to work at the continuous heating power without wave loss in the target heating time periods.

8. The electromagnetic heating device control method according to claim 7, wherein, The controlling the electromagnetic heating device to work at the continuous heating power without wave loss in the target heating time periods further includes: Classify the heating time periods within the heating cycle into the target heating time periods and non-target heating time periods; During the heating cycle, sort the target heating time periods and the non-target heating time periods in a first sorting order; Control the electromagnetic heating device to operate in sequence at the non-drop-wave continuous heating power during the target heating time periods.

9. A control device for an electromagnetic heating device, characterized in that, The electromagnetic heating device control apparatus is used to implement the electromagnetic heating device control method according to any one of claims 1 to 8.

10. An electromagnetic heating device, characterized in that, The electromagnetic heating device includes the electromagnetic heating device control apparatus according to claim 9.

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