Electromagnetic heating equipment control methods, control devices, and electromagnetic heating equipment

Abstract

This invention discloses a control method, control device, and electromagnetic heating equipment for electromagnetic heating devices, relating to the field of electromagnetic heating technology. The control method includes: acquiring a continuous heating power without power loss and a target minimum power; determining the number of heating time periods based on the continuous heating power without power loss and the target minimum power; and determining the total duration of the determined number of heating time periods as the heating cycle; acquiring a target power; determining the required number of heating time periods based on the target power and the target minimum power; and controlling the electromagnetic heating equipment to operate at the continuous heating power without power loss according to the determined number of heating time periods within the heating cycle. The electromagnetic heating equipment control method provided by this invention can improve the stability of electromagnetic heating equipment when operating at low power, thereby improving the user experience when operating electromagnetic heating equipment at low power.

Description

Technical Field

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

[0002] Currently, most induction cookers on the market operate at low power using intermittent heating, meaning they operate for a period and then pause for a period. However, these pauses are relatively long, usually more than 10 seconds, during which time the food cools down. This results in uneven heating during cooking, leading to a poor user experience. Summary of the Invention

[0003] The main objective of this invention is to provide a control method, control device, and electromagnetic heating equipment for electromagnetic heating devices, aiming to improve the user experience.

[0004] To achieve the above objectives, the present invention proposes an electromagnetic heating device control method, comprising:

[0005] Obtain the continuous heating power without wave loss and the target minimum power, and determine the number of heating time periods based on the continuous heating power without wave loss and the target minimum power. The sum of the durations of the corresponding number of heating time periods is determined as the heating cycle.

[0006] Obtain the target power;

[0007] The required number of heating time periods is determined based on the target power and the target minimum power. During the heating cycle, the electromagnetic heating device is controlled to operate at the continuous heating power without wave loss according to the determined number of heating time periods.

[0008] In one embodiment, obtaining continuous heating power without wave loss includes:

[0009] The operating power of the electromagnetic heating device is adjusted sequentially according to a first preset cycle, and the number of hard-on cycles of the electromagnetic heating device within each first preset cycle is counted; the hard-on indicates 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.

[0010] When the number of hard-on cycles accumulated in any first preset cycle reaches the first preset value, the operating power of the current first preset cycle is determined to be the waveless continuous heating power.

[0011] In one embodiment, adjusting the operating power of the electromagnetic heating device sequentially according to a first preset cycle includes:

[0012] The operating power of the electromagnetic heating device is adjusted from small to large according to a first preset cycle; or...

[0013] The operating power of the electromagnetic heating device is adjusted from large to small according to the first preset cycle.

[0014] In one embodiment, determining the number of heating time periods based on the continuous heating power without wave loss and the target minimum power, and determining the sum of the durations of the corresponding number of heating time periods as the heating cycle includes:

[0015] Determine a first ratio between the waveless continuous heating power and the target minimum power;

[0016] Obtain the number of heating time periods corresponding to the first ratio;

[0017] The heating cycle is obtained by calculating the sum of the durations of the corresponding number of heating time periods.

[0018] In one embodiment, the electromagnetic heating device control method further includes:

[0019] Obtain the current input frequency and determine the current input period corresponding to the current input frequency;

[0020] The duration of the heating time period is determined based on the duration of the current input cycle.

[0021] In one embodiment, determining the duration of the heating time period based on the duration of the current input cycle includes:

[0022] Obtain the half-wave period of the current input period and determine the duration of the half-wave period;

[0023] The duration of the half-wave period is configured to correspond to the duration of the heating time period.

[0024] In one embodiment, determining the required number of heating time periods based on the target power and the target minimum power, and controlling the electromagnetic heating device to operate at the determined number of heating time periods with the lossless continuous heating power during the heating cycle includes:

[0025] Calculate a second ratio between the target power and the target minimum power;

[0026] Based on the second ratio, within the heating cycle, a number of heating time periods corresponding to the second ratio are determined as the target heating time periods;

[0027] The electromagnetic heating device is controlled to operate at the target heating time period with the continuous heating power without wave loss.

[0028] In one embodiment, controlling the electromagnetic heating device to operate at the lossless continuous heating power during the target heating time period further includes:

[0029] The heating time periods within the heating cycle are classified into target heating time periods and non-target heating time periods;

[0030] Within the heating cycle, the target heating time period and the non-target heating time period are sorted in a first order;

[0031] The electromagnetic heating device is controlled to operate sequentially during the target heating time period with the continuous heating power without wave loss.

[0032] The present invention also provides an electromagnetic heating equipment control device, which is used to implement the electromagnetic heating equipment control method as described in any of the above claims.

[0033] The present invention also provides an electromagnetic heating device, which includes the electromagnetic heating device control device as described above.

[0034] In summary, the electromagnetic heating device control method provided by this invention enables continuous low-power heating of the electromagnetic heating device, improving the user experience. The method includes acquiring the duration of a heating time period, then calculating the number of heating time periods constituting a heating cycle based on the continuous heating power without wave loss and the target minimum power. Finally, within the heating cycle, the electromagnetic heating device is controlled to operate at the continuous heating power without wave loss for the corresponding number of heating time periods according to the target power, thus bringing the current power of the electromagnetic heating device close to the target power. It can be understood that since the heating cycle is determined by the continuous heating power without wave loss and the target minimum power, each heating time period operating at the continuous heating power without wave loss within the heating cycle represents one target minimum power. Therefore, the number of heating time periods required in the heating cycle can be determined based on the target power to achieve the target power. Thus, by using continuous heating power without wave loss, continuous low-power heating can be achieved as much as possible without hard-starting, thereby meeting the need for continuous low-power operation and making the electromagnetic heating device heat more evenly during low-power operation, improving the user experience. Attached Figure Description

[0035] 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.

[0036] Figure 1A flowchart of the first embodiment of the electromagnetic heating device control method provided by the present invention;

[0037] Figure 2 A flowchart of the second embodiment of the electromagnetic heating device control method provided by the present invention;

[0038] Figure 3 A flowchart of the third embodiment of the electromagnetic heating device control method provided by the present invention;

[0039] Figure 4 A flowchart of the fourth embodiment of the electromagnetic heating device control method provided by the present invention;

[0040] Figure 5 A flowchart of the fifth embodiment of the electromagnetic heating device control method provided by the present invention;

[0041] Figure 6 A flowchart of the sixth embodiment of the electromagnetic heating device control method provided by the present invention;

[0042] Figure 7 A flowchart of the seventh embodiment of the electromagnetic heating device control method provided by the present invention;

[0043] Figure 8 A flowchart of the eighth embodiment of the electromagnetic heating device control method provided by the present invention;

[0044] Figure 9 The waveform diagram shows the heating time period and heating cycle.

[0045] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] 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.

[0047] 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.

[0048] It should be noted that step designations such as S100 and S200 are used in this document for the purpose of more clearly and concisely describing the corresponding content, and do not constitute a substantial limitation on the order. Those skilled in the art may execute S200 first and then S100 in specific implementation, but these should all be within the protection scope of this invention.

[0049] Existing single-tube induction cookers can only reach half of their rated maximum power for continuous, wave-free heating. For example, an induction cooker with a maximum power of 2000W can achieve continuous, wave-free heating at 1000W, but below 1000W, severe hard-start occurs, damaging the power switch and affecting its lifespan. However, users often need to operate the induction cooker at low power, such as for heat preservation or solid-liquid refining. Therefore, when attempting to heat at even lower power, the power switch faces hard-start conditions, resulting in higher start-up losses and severe overheating, increasing the risk of power switch damage.

[0050] Therefore, to prevent this from happening, existing induction cookers typically do not use continuous heating mode at low power. Most induction cookers on the market maintain the required temperature by using intermittent heating at low power, meaning that the cooker will stop heating for a period of time after operating for a while. This pause period is often relatively long, generally exceeding 10 seconds. This prolonged pause causes a significant drop in the surface temperature of the food, resulting in uneven heating. This is particularly detrimental to cooking activities requiring precise heat control, such as pancakes or steaks, easily leading to overcooked or undercooked areas; and in low-temperature cooking requiring constant temperature, such as melting chocolate, it can cause burning.

[0051] In summary, current induction cooker technology faces challenges at multiple levels, from hardware limitations to actual performance, when dealing with low-power heating needs, resulting in a poor user experience.

[0052] Therefore, in order to improve the low-power user experience of electromagnetic heating equipment, this invention provides a control method for electromagnetic heating equipment.

[0053] 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.

[0054] In one embodiment, such as Figure 1 As shown, the electromagnetic heating device control method includes steps S100 to S300.

[0055] In this embodiment, step S100 involves obtaining the continuous heating power without wave loss and the target minimum power, and determining the number of heating time periods based on the continuous heating power without wave loss and the target minimum power, and then determining the total duration of the corresponding number of heating time periods as the heating cycle.

[0056] It is understood that a heating time period is the smallest unit of time in a heating cycle; that is, multiple heating time periods can be combined into one heating cycle. In this embodiment, the heating cycle is equal to the sum of the durations of the number of heating time periods determined based on the continuous heating power without power loss and the target minimum power. Within a heating time period, the electromagnetic heating device can continuously perform at least one complete heating operation. A complete operation refers to accurately calculating the corresponding average power within that heating time period under the action of alternating current. After obtaining the duration of the heating time period, the electromagnetic heating device can flexibly adjust its working mode according to different usage requirements and heating tasks.

[0057] Understandably, based on the continuous heating power without wave loss and the target minimum power, a suitable heating cycle can be calculated. The heating cycle refers to the time required to complete one full heating process; the length of the heating cycle directly affects heating efficiency and temperature stability. The average temperature within this heating cycle is the target temperature set by the user.

[0058] It needs to be explained that the zero-loss continuous heating power refers to the minimum power level at which the electromagnetic heating device can operate stably and continuously 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 ensures fewer hard-switching events during the power switch's startup process (hard-switching refers to a high voltage across the power switch during startup, which can easily cause damage). Therefore, if the electromagnetic heating device attempts to operate below this zero-loss continuous heating power, hard-switching will occur, which will damage the power switch. The purpose of step S100 is to determine this zero-loss continuous heating power to identify the minimum power limit at which the electromagnetic heating device can operate stably. This helps ensure a more uniform and stable heating effect while meeting the user's need for continuous low-power heating.

[0059] It also needs to be explained that the target minimum power is the minimum heating power expected by the user, which is the user's minimum set power. From the user's perspective, the target minimum power intuitively represents the minimum heating power that the electromagnetic heating device expects to achieve. It is a key power threshold set by the user based on their own usage intentions when operating the device, which is the user's minimum set power.

[0060] The target minimum power is often lower than the continuous heating power without wave loss. Therefore, when the user uses the target minimum power as the set power, the prior art uses intermittent heating to make the average power of the electromagnetic heating device as close as possible to the set power over a period of time. This also leads to uneven heating.

[0061] It is important to note that a heating cycle consists of several heating time periods. The number of heating time periods can be obtained by using the continuous heating power without wave loss and the target minimum power. Combining these multiple heating time periods constitutes one heating cycle. In one feasible implementation, the continuous heating power without wave loss is 1000W, and the target minimum power is 50W. Dividing the continuous heating power without wave loss by the target minimum power gives 1000W divided by 50W, resulting in 20. Therefore, the heating cycle is determined to consist of 20 heating time periods.

[0062] In this embodiment, step S200 is to obtain the target power.

[0063] The target power can be set by the user, i.e., a power value set by the user, which can be achieved through the interactive components or wireless communication components of the electromagnetic heating device. Alternatively, the target power can be an adaptively adjusted power value by the electromagnetic heating device during operation, such as a target power set adaptively based on current heating needs. Of course, there are other methods for setting the target power, which will not be listed here. The specific method for setting the target power is not limited here; it can serve as the final power that the electromagnetic heating device needs to achieve.

[0064] In this embodiment, step S300 involves determining the required number of heating time periods based on the target power and the target minimum power, and controlling the electromagnetic heating device to operate at the continuous heating power without wave loss according to the determined number of heating time periods within the heating cycle.

[0065] It is worth noting that, among the multiple heating time periods determined based on the continuous heating power without wave loss and the target minimum power, if the device operates at continuous heating power without wave loss during any heating time period, then the average power of the electromagnetic heating device throughout the corresponding heating cycle will be the continuous heating power without wave loss divided by the total number of heating time periods within that heating cycle. In other words, if, within a heating cycle, there is at least one heating time period operating at continuous heating power without wave loss, while the remaining heating time periods are inactive, then the average power for the entire cycle will be the maximum stable power distributed across all heating time periods. Similarly, if the device operates at continuous heating power without wave loss during any two heating time periods, but not during the other heating time periods, then the average power within this heating cycle will be twice the average power of a single heating time period. This is because two heating time periods are operating at maximum stable power, while the remaining heating time periods are inactive, thus doubling the average power compared to the scenario where only one heating time period is operating. Therefore, by adjusting the number of heating time periods operating 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, you can choose to operate with less heating time period at continuous heating power without loss of power; conversely, if a higher average power is required, you can increase the number of heating time periods.

[0066] In some exemplary electromagnetic heating device control methods, intermittent heating is often used to achieve continuous low-power heating. However, due to the long pause time (usually exceeding 10 seconds), large temperature fluctuations are easily caused. This method, by dividing the heating cycle into multiple shorter heating time periods (e.g., milliseconds or microseconds), significantly shortens the time interval between heating and pauses, thereby effectively reducing temperature fluctuations. By flexibly adjusting the number of heating time periods operating within each cycle, the user's low-power requirements can be precisely matched, making the actual operating power as close as possible to the target power. However, in this method, the electromagnetic heating device always operates at continuous heating power without power loss, even in low-power conditions; the average power output is reduced simply by decreasing the number of heating time periods. This fundamentally avoids the hard-start problem and extends the lifespan of the power switch. More importantly, through this method, the electromagnetic heating device can operate at continuous heating power without power loss for a specific number of heating time periods within each heating cycle, achieving periodic heating. Because each heating period is short, it effectively reduces the surface temperature fluctuations of food caused by long pauses in traditional intermittent heating, resulting in a more even heat distribution. This avoids localized overheating or underheating, thus improving the user experience.

[0067] It is important to note that when the electromagnetic heating equipment operates at continuous heating power without wave loss, the average power over the duration of the heating period must correspond to that continuous heating power without wave loss. Since the input of the electromagnetic heating equipment is connected to AC power, the voltage, after passing through the rectifier and filter circuit, presents a half-wave waveform. In this case, the power output is also related to this half-wave waveform. When the electromagnetic heating equipment operates at continuous heating power without wave loss, the average power of each half-wave should be equal to that continuous heating power without wave loss. If the duration is not selected correctly, some key data points may be missed, such as only collecting data from troughs or peaks instead of the complete half-wave waveform. This will lead to a discrepancy between the actual power output and the expected output, thus affecting the heating effect and equipment performance. Therefore, the duration of the heating period is determined to be a multiple of the half-wave to ensure that the average power over the heating period fully reflects the continuous heating power without wave loss.

[0068] In one feasible implementation, the continuous heating power without power loss is 1000W, while the target minimum power is 50W and the target power is 150W. A heating cycle is defined as consisting of 20 heating time periods (derived from the ratio of the continuous heating power without power loss to the target minimum power). Then, for the target power of 150W, the electromagnetic heating device needs to operate at 1000W for 3 heating time periods within each heating cycle, while remaining in a standby state for the remaining 17 heating time periods. This ensures that the average power throughout the heating cycle remains stable at 150W, while avoiding damage to the power switch caused by hard switching. Furthermore, because the time intervals between heating time periods are short and evenly distributed, the heat output is more stable, effectively reducing temperature fluctuations. This achieves efficient and uniform low-power heating, meeting the user's need for precise power control.

[0069] In summary, the electromagnetic heating device control method provided by this invention enables continuous low-power heating of the electromagnetic heating device, improving the user experience. The method includes acquiring the duration of a heating time period, then calculating the number of heating time periods constituting a heating cycle based on the continuous heating power without wave loss and the target minimum power. Finally, within the heating cycle, the electromagnetic heating device is controlled to operate at the continuous heating power without wave loss for the corresponding number of heating time periods according to the target power, thus bringing the current power of the electromagnetic heating device close to the target power. It can be understood that since the heating cycle is determined by the continuous heating power without wave loss and the target minimum power, each heating time period operating at the continuous heating power without wave loss within the heating cycle represents one target minimum power. Therefore, the number of heating time periods required in the heating cycle can be determined based on the target power to achieve the target power. Thus, by using continuous heating power without wave loss, continuous low-power heating can be achieved as much as possible without hard-starting, thereby meeting the need for continuous low-power operation and making the electromagnetic heating device heat more evenly during low-power operation, improving the user experience.

[0070] In one embodiment, such as Figure 2 As shown, step S100 further includes steps S110 and S120, which are used to determine the continuous heating power without wave loss that occurs in step S100.

[0071] In this embodiment, step S110 involves adjusting the operating power of the electromagnetic heating device sequentially according to a first preset cycle, and counting the number of hard-on cycles of the electromagnetic heating device within each first preset cycle.

[0072] The term "hard turn-on" indicates 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.

[0073] Understandably, to determine the continuous heating power without waveform loss, it is first necessary to identify the frequency of hard-switching phenomena occurring in the electromagnetic heating equipment at different power levels. Hard-switching refers to the situation where the voltage across the power switch of the electromagnetic heating equipment exceeds a first preset voltage when it is turned on. This situation may damage the power switch and affect the stability and lifespan of the equipment. Therefore, in step S120, the control system adjusts the operating power of the electromagnetic heating equipment sequentially according to a first preset cycle, while simultaneously detecting and recording in real time whether the voltage across the power switch exceeds a preset safety threshold each time it is turned on. In this way, the control system can accurately measure and record the number of hard-switching events under different power settings, providing data support for subsequently determining the optimal continuous heating power without waveform loss.

[0074] In this embodiment, step S120, when the number of hard-on cycles accumulated in any first preset cycle reaches the first preset value, determines the operating power of the current first preset cycle as the waveless continuous heating power.

[0075] Understandably, when the hard-on count in step S110 reaches a preset threshold (i.e., the preset value for the first count), it indicates that the operating power has approached or reached the limit of safe operation of the power switch. At this critical point, further increasing or decreasing the power will increase the risk of hard-on, potentially damaging the equipment. Therefore, step S120 defines the operating power just before reaching the hard-on count threshold as the continuous heating power without power loss, ensuring that the electromagnetic heating equipment can operate continuously at the highest safe power without triggering hard-on. This avoids damage to the power switch due to frequent hard-on and maximizes the heating efficiency and uniformity of the equipment at low power, providing users with a more reliable and efficient heating experience.

[0076] It should be noted that reaching the first preset value for the accumulated number of hard-start cycles means that the accumulated number of hard-start cycles within a certain first preset cycle reaches the first preset value. After reaching the first preset value, the adjusted operating power corresponding to the current first preset cycle is determined as the continuous heating power without wave loss.

[0077] The first preset cycle can be set according to the needs of the actual application scenario. Its purpose is to ensure that the system has enough time to fully detect and statistically analyze hard-on situations under different power levels. The first preset value, which is also set according to the specific application scenario and equipment design requirements, is used to determine whether the hard-on phenomenon has reached a critical point.

[0078] In one embodiment, such as Figure 3 As shown, step S110 may also include step S111 or step S112.

[0079] In this embodiment, step S111 involves adjusting the operating power of the electromagnetic heating device from small to large according to a first preset cycle.

[0080] In this embodiment, step S112 involves adjusting the operating power of the electromagnetic heating device from large to small according to a first preset cycle.

[0081] Understandably, regardless of whether the adjustment is from small to large or from large to small, the core objective is to determine the continuous heating power without power loss. Although these two methods adjust in different directions, their ultimate goal is to find the critical point at which the power switch can operate safely by monitoring changes in the number of hard-switching cycles. This ensures that the electromagnetic heating equipment can avoid damage to the hardware caused by hard-switching while achieving efficient and stable heating effects when operating at low power.

[0082] In practice, the choice of adjustment method depends primarily on the actual application scenario and testing requirements. For example, if a more robust approach to continuously heating power without wave loss is desired, an adjustment method from small to large can be chosen; conversely, if a rapid identification of the problem area and reduction of testing time are required, an adjustment method from large to small can be selected.

[0083] It's important to explain that this method allows the electromagnetic heating device to detect hard-on conditions in real time, addressing the impact of different cookware materials and shapes on the hard-on voltage. Because different cookware have varying electromagnetic characteristics, their corresponding hard-on voltage thresholds also differ. Therefore, traditional fixed-preset continuous heating power without waveform loss may not be applicable to all scenarios. To solve this problem, the control system can dynamically adjust the continuous heating power without waveform loss by continuously reducing the operating power, gradually approaching the minimum limit for safe operation of the power switch. During this process, the control system monitors the frequency and intensity of hard-on phenomena in real time until the hard-on condition is no longer noticeable or completely disappears. The operating power corresponding to this point is determined as the minimum continuous heating power without waveform loss. This method not only adapts to the characteristics of various cookware but also maximizes the stability of the device during low-power operation, while ensuring heating efficiency and uniformity, thereby optimizing the user experience.

[0084] In one embodiment, such as Figure 4 As shown, step S100 further includes steps S130 to S150, which are used to calculate the heating cycle based on the continuous heating power without wave loss and the target minimum power.

[0085] In this embodiment, step S130 involves determining a first ratio between the waveless continuous heating power and the target minimum power.

[0086] Understandably, the first ratio can be obtained by dividing the continuous heating power without power loss by the target minimum power, or vice versa. For example, if the continuous heating power without power loss is 1000W and the target minimum power is 50W, then the first ratio is 1000W:50W=20. This first ratio actually reflects how many minimum working units (i.e., heating time periods) are needed to achieve the transition from the maximum stable power to the user's desired minimum power.

[0087] In this embodiment, step S140 involves obtaining the number of heating time periods corresponding to the first ratio.

[0088] Understandably, step S140 determines how many heating time periods are needed to form a complete heating cycle based on 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. Within each heating time period, the electromagnetic heating device can perform at least one complete heating operation. This ensures flexible control over the actual output power of the electromagnetic heating device, making it as close as possible to the user-set target power.

[0089] In this embodiment, step S150 involves calculating the total duration of the corresponding number of heating time periods to obtain the heating cycle.

[0090] Understandably, in step S150, the total duration of the entire heating cycle is calculated by summing the durations of the corresponding number of heating time periods. Since each heating time period has its specific duration (typically in the millisecond or microsecond range), adding the durations of these heating time periods together yields the length of a complete heating cycle. This helps to precisely control the operating mode of the electromagnetic heating device, ensuring that it can meet users' different power requirements while minimizing temperature fluctuations caused by intermittent heating, providing a more uniform and stable heating effect, and thus improving the user experience.

[0091] In one feasible implementation, the electromagnetic heating device has a continuous, waveless heating power of 1000W, a user-desired minimum power of 50W, and a heating time interval of 50 milliseconds. First, the ratio of the continuous, waveless heating power to the minimum target power is calculated to be 20, meaning a complete heating cycle consists of 20 heating time intervals. Then, based on the 50-millisecond duration of each heating time interval, the total duration of the entire heating cycle is calculated to be 1 second (i.e., 20 heating time intervals multiplied by 50 milliseconds per unit). In this way, the electromagnetic heating device can precisely match the user-set target power by flexibly adjusting the number of heating time intervals operating at 1000W within a 1-second heating cycle. For example, when the target power is 50W, the electromagnetic heating device only needs to operate at continuous, waveless heating power for one heating period out of 20 heating time slots, while the other 19 units are idle. When the target power is 100W, the electromagnetic heating device operates at continuous, waveless heating power for two heating periods out of 20 heating time slots, while the other 18 units are idle. This avoids the damage caused by forced switching on, reduces temperature fluctuations, and significantly improves heating performance and user experience.

[0092] In one embodiment, such as Figure 5 As shown, the electromagnetic heating equipment control method further includes steps S400 and S500.

[0093] In this embodiment, step S400 involves obtaining the current input frequency and determining the current input period corresponding to the current input frequency.

[0094] Understandably, the control system first needs to obtain the current input frequency of the electromagnetic heating device. This input frequency typically refers to the power frequency provided by the AC power supply, such as the common 50Hz or 60Hz. Based on this input frequency, the duration of the current input cycle can be further calculated. The input cycle refers to the time required to complete a full voltage waveform (from one peak to the next identical peak), and it is the reciprocal of the frequency. For example, for an input frequency of 50Hz, the corresponding input cycle is 1 / 50 of a second, or 20 milliseconds; while for an input frequency of 60Hz, it is 1 / 60 of a second, approximately 16.67 milliseconds. Through this step, the system can accurately understand the basic time unit under the current power supply conditions, providing fundamental data for subsequent operations.

[0095] In this embodiment, step S500 involves determining the duration of the heating time period based on the duration corresponding to the current input cycle.

[0096] Understandably, since the efficiency and stability of electromagnetic heating equipment are closely related to the characteristics of the input power supply, selecting an appropriate heating time period is crucial. The heating time period serves as the smallest unit of working time. At this stage, the control system determines the optimal length of the heating time period based on relevant information from the input cycle. This ensures that each heating time period performs at least one complete heating operation within the optimal time frame, thereby guaranteeing the efficiency and uniformity of the heating process.

[0097] In one embodiment, such as Figure 6 As shown, step S500 also includes steps S510 and S520.

[0098] In this embodiment, step S510 involves obtaining the half-wave period of the current input period and determining the duration of the half-wave period.

[0099] Understandably, in an alternating current environment, the direction of the current changes periodically, forming two half-waves, positive and negative. The half-wave period is obtained, and its corresponding duration is determined. Taking 50Hz as an example, the entire input period is 20 milliseconds, so a single half-wave period is 10 milliseconds. The importance of the half-wave period lies in its ability to accurately summarize the current average power, and its very short duration.

[0100] In this embodiment, step S520 involves configuring the duration of the half-wave period to the duration corresponding to the heating time period.

[0101] Understandably, the power output of an 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 cycle is relatively stable. If the heating time period is not an integer multiple of the half-wave cycle, some waveforms may be truncated or omitted, leading to data loss or unstable power output. For example, if the heating time period is too short, it may only cover the peaks or troughs of the waveform, failing to reflect the true power level of the entire half-wave cycle; while if the duration is too long, it may contain multiple incomplete half-waves, causing power calculation errors. By selecting the half-wave cycle as the basic duration of the heating time period, the power characteristics within each half-wave can be fully captured, avoiding the aforementioned problems and ensuring the accuracy and stability of the power output. This also lays a reliable foundation for achieving uniform heating during subsequent low-power operation.

[0102] Furthermore, because it uses half-wave heating periods, each half-wave cycle is extremely short (e.g., only 10 milliseconds under 50Hz AC power), resulting in a very short overall heating cycle, typically controllable within 200 milliseconds or even less. Due to the high frequency of heating period switching, far exceeding human sensory perception, users are virtually unaware of the intermittent heating, achieving a perceived continuous low-power operation. Simultaneously, this short-cycle design effectively reduces temperature fluctuations caused by prolonged pauses in traditional intermittent heating, resulting in more even heat distribution and preventing localized overheating or underheating, significantly improving the user experience.

[0103] Of course, in other implementations, the heating period can be defined as the duration corresponding to two half-waves, or it can be defined as the duration corresponding to three half-waves. The specific number of half-waves depends on the actual application requirements. The shorter the heating period, the shorter the heating cycle, and the less perceptible it is to humans. Naturally, the food will be heated more evenly.

[0104] It is particularly important to note that determining the heating time period by frequency also addresses power supply differences across regions, ensuring the equipment's global compatibility and stability. Because power grid frequencies vary worldwide (for example, China and Europe mostly use 50Hz, while the US and some other countries use 60Hz), electromagnetic heating equipment needs to adapt to these different input frequencies. By calculating the heating time period based on the input frequency, the equipment can flexibly adjust its operating cycle to match local power conditions. Thus, determining the heating time period by frequency avoids power output instability or efficiency degradation caused by frequency mismatch, and ensures precise power control in any region, allowing users to enjoy a consistent and reliable heating experience regardless of their location.

[0105] In one feasible implementation, such as Figure 9 As shown, the current input cycle is 50Hz, so the half-wave period is 10ms. The duration of the heating time period is equal to the half-wave period. Of course, the half-wave period can be set as the heating time period, or simply the duration of the heating time period can be equal to the half-wave period. Furthermore, the continuous heating power without wave loss is 1200W, and the minimum target power is 50W. Therefore, there are 24 heating time periods forming a heating cycle, each corresponding to 10ms, and one heating cycle is 240ms. Thus, when the target power is 50W, it can correspond to heating one heating time period within that heating cycle, such as... Figure 9The shaded area corresponds to the heating time period. 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 heat two heating time periods in this heating cycle. The power of the other 22 heating time periods is 0, so the power corresponding to this heating cycle is 100W.

[0106] In one embodiment, such as Figure 7 As shown, step S300 includes steps S310 to S330.

[0107] In this embodiment, step S310 involves calculating a second ratio between the target power and the target minimum power.

[0108] Understandably, the second ratio can be obtained by dividing the target power by the minimum target power, or vice versa. For example, if the user sets a target power of 150W and the device's minimum target power is 50W, then the second ratio is 150W : 50W = 3. This second ratio represents how many minimum units (i.e., heating time periods) are needed to achieve the user's desired heating effect. By calculating this ratio, the control system can accurately determine how many heating time periods need to be activated to meet the user's power requirements.

[0109] In this embodiment, step S320 involves determining, within the heating cycle, a target heating time period corresponding to the second ratio, based on the second ratio.

[0110] Understandably, step S320, based on the second ratio calculated in step S310, further determines the number of specific heating time periods that need to be activated within the heating cycle. In one embodiment, if the second ratio is 3, it means that three heating time periods will be selected as target heating time periods throughout the entire heating cycle.

[0111] In this embodiment, step S330 involves controlling the electromagnetic heating device to operate at the target heating time period with the continuous heating power without wave loss.

[0112] Understandably, during each selected target heating time period within a heating cycle, the electromagnetic heating device will operate with continuous heating power without any loss of pulse, while remaining in a standby state during the remaining heating time periods. In this way, the user-set target power can be achieved within a complete heating cycle. For example, if a heating cycle consists of 20 heating time periods, and the second ratio determines that 3 target heating time periods are needed, then during these 3 periods, the device will operate at 1000W, while the remaining 17 periods will be inactive, making the average power close to the user-set target power. This method not only ensures the accuracy of power output but also avoids damage to the power switch caused by hard switching, improving the device's lifespan and heating efficiency. Furthermore, because the time intervals between heating time periods are very short, from the user's perspective, this intermittent operation is almost seamless, providing a more uniform and stable heating experience.

[0113] In one embodiment, such as Figure 8 As shown, step S330 also includes steps S331 to S333.

[0114] In this embodiment, step S331 involves classifying the heating time periods within the heating cycle into target heating time periods and non-target heating time periods.

[0115] Understandably, the control system first needs to classify the heating time periods within the entire heating cycle, clearly identifying which are target heating time periods and which are non-target heating time periods. Target heating time periods refer to those units operating at continuous, waveless heating power within the heating cycle, while non-target heating time periods are those units that are not operating or are in a standby state during that cycle. For example, assuming a heating cycle consists of 20 heating time periods, and the user-set target power calculates that 3 target heating time periods are needed, then 3 of these 20 heating time periods will be marked as target heating time periods, and the remaining 17 will be non-target heating time periods. This classification method provides the foundation for subsequent precise control of the electromagnetic heating equipment's operating mode.

[0116] In this embodiment, step S332 involves sorting the target heating time period and the non-target heating time period in a first order within the heating cycle.

[0117] Understandably, the target heating time period 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 within the entire heating cycle, thus affecting the uniformity and efficiency of the heating process. For example, one possible first arrangement order could be to insert a target heating time period after every few non-target heating time periods, i.e., "non-non-non-target-non-non-non-target..." (where "non" refers to non-target heating time periods; "target" refers to target heating time periods). This intermittent distribution helps reduce temperature fluctuations. In this way, not only can the heating effect be optimized, but the risk of hard-turn-on phenomena can also be effectively reduced, protecting the power switch.

[0118] In this embodiment, step S333 involves controlling the electromagnetic heating device to operate sequentially during the target heating time period with the continuous heating power without wave loss.

[0119] Understandably, in step S333, the control system controls the electromagnetic heating device to operate with continuous, waveless heating power during the target heating time periods according to a predetermined first sequence. That is, in each heating cycle, the electromagnetic heating device activates the target heating time period according to the predetermined first sequence, while remaining idle during non-target heating time periods. For example, if the sequence "non-non-non-target-non-non-non-target..." (where "non" refers to non-target heating time periods and "target" refers to target heating time periods) is used, then in a heating cycle containing 20 heating time periods, the electromagnetic heating device will operate at 1000W power during the target heating time periods at positions 4, 8, and 12, while remaining inactive at other positions. This orderly switching mechanism not only ensures the accuracy of power output but also makes the intermittent heating virtually imperceptible to the user, achieving a near-continuous low-power operation effect and significantly improving the user experience.

[0120] It should be noted that the specific order of this first arrangement is not limited here. It can be a series of consecutive target heating time periods, i.e., "non-non-non-target-target-target-non-non-non", or it can be a uniformly distributed target heating time period and non-target heating time period, i.e., "non-non-non-target-non-non-non-target...".

[0121] In one feasible implementation, an induction cooker has a continuous heating power of 1000W without wave loss and a target minimum power of 50W. The user desires heating at 150W (i.e., the target power). The input power frequency is 50Hz, and each half-wave cycle is 10 milliseconds; therefore, each heating time period is set to 10 milliseconds. Based on this, the control system first calculates that a complete heating cycle consists of 20 heating time periods (1000W: 50W = 20), with a total cycle duration of 200 milliseconds (20 × 10 ms). To achieve the user-set target power of 150W, the control system calculates that 3 target heating time periods need to be activated within each heating cycle (150W: 50W = 3), while the remaining 17 heating time periods remain in a dormant state. In actual operation, the control system arranges these target heating time periods in a uniformly distributed manner, for example, "non-non-non-non-eye ... The induction cooker operates at a continuous 1000W heating power without wave drop during each target heating period, following this sequence, while completely stopping heating during non-target heating periods. Since each heating period lasts only 10 milliseconds, the intermittent heating is almost imperceptible to the user, achieving a near-continuous low-power operation.

[0122] Understandably, when the electromagnetic heating device is an induction cooker, this method, by employing a short-cycle intermittent heating mode, effectively solves the problems of uneven heating, localized overcooking or scorching, and burning that occur with traditional induction cookers at low power. Unlike most induction cookers on the market, which use long pauses (usually exceeding 10 seconds) leading to significant temperature drops and uneven heating, this method sets each heating period to an extremely short time (e.g., 10 milliseconds) and evenly distributes the target heating period within a complete heating cycle. This allows the induction cooker to operate with continuous heating power without wave drop for a short period, then quickly switch to a pause state, thus avoiding localized overheating caused by prolonged high-power heating. Due to the very short intervals, the power changes are smooth, preventing drastic fluctuations in the food's surface temperature. At high power, the induction cooker can quickly provide the required heat, while the short pauses allow for even heat distribution, preventing localized overheating. Furthermore, this method is particularly suitable for low-temperature cooking scenarios requiring constant temperature control, such as melting chocolate, because it can maintain a stable temperature and avoid burning caused by sudden temperature drops. Therefore, when operating at low power, this method not only ensures the uniformity and stability of heating, but also provides more precise heat control, enhancing the overall cooking experience.

[0123] The present invention also provides a control device for an electromagnetic heating device, comprising 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 used to calculate the heating time period. The period calculation circuit is used to obtain the continuous heating power without wave loss and the target minimum power, and to determine the heating cycle by the sum of the durations of the corresponding number of heating time periods determined based on the continuous heating power without wave loss and the target minimum power. The control circuit is electrically connected to the unit calculation circuit and the period calculation circuit. The control circuit is used to control the electromagnetic heating device to operate at the continuous heating power without wave loss within the corresponding number of heating time periods during the heating cycle, based on the target power and the target minimum power.

[0124] In one feasible embodiment, the electromagnetic heating device further includes a power switch and a switch driving circuit. The switch driving circuit drives the power switch and is connected to the control circuit. After the unit calculation circuit and the period calculation circuit determine the heating time period and the heating cycle, the control circuit can output a corresponding dropped heating signal to the switch driving circuit according to the electromagnetic heating device control method described in any of the above embodiments, so that the switch driving circuit drives the power switch, thereby achieving continuous low-power heating and improving the user experience.

[0125] The present invention also proposes an electromagnetic heating device, which includes an electromagnetic heating device control device. The electromagnetic heating device control device is used to implement an electromagnetic heating device control method. The specific implementation of the electromagnetic heating device control method refers to the above embodiments. 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 described in detail here.

[0126] It is understood that electromagnetic heating equipment can be induction cookers, induction ovens, induction stoves, induction heating rice cookers, and induction heating furnaces, etc. The specific product of electromagnetic heating equipment is not limited here.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention 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 the present invention, and they should all be covered within the scope of the claims and specification of the present invention. 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. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling 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 equipment includes: The continuous heating power without wave loss and the target minimum power are obtained, and the number of heating time periods is determined based on the continuous heating power without wave loss and the target minimum power. The total duration of the corresponding number of heating time periods is determined as the heating cycle. The continuous heating power without wave loss is the minimum power level of the electromagnetic heating device without power loss. Obtain the target power; The number of heating time periods required is determined based on the target power and the target minimum power. During the heating cycle, the electromagnetic heating device is controlled to operate at the continuous heating power without wave loss according to the determined number of heating time periods. The step of determining the number of heating time periods based on the continuous heating power without wave loss and the target minimum power, and determining the sum of the durations of the corresponding number of heating time periods as the heating cycle includes: Determine a first ratio between the waveless continuous heating power and the target minimum power; Obtain the number of heating time periods corresponding to the first ratio; Calculate the total duration of the corresponding number of heating time periods to obtain the heating cycle; The step of determining the required number of heating time periods based on the target power and the target minimum power, and controlling the electromagnetic heating device to operate at the determined number of heating time periods with the lossless continuous heating power during the heating cycle includes: Calculate a second ratio between the target power and the target minimum power; Based on the second ratio, within the heating cycle, a number of heating time periods corresponding to the second ratio are determined as the target heating time periods; The electromagnetic heating device is controlled to operate at the target heating time period with the continuous heating power without wave loss.

2. The electromagnetic heating equipment control method as described in claim 1, characterized in that, The process of obtaining continuous heating power without wave loss includes: The operating power of the electromagnetic heating device is adjusted sequentially according to a first preset cycle, and the number of hard-on cycles of the electromagnetic heating device within each first preset cycle is counted; the hard-on indicates 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. When the number of hard-on cycles accumulated in any first preset cycle reaches the first preset value, the operating power of the current first preset cycle is determined to be the waveless continuous heating power.

3. The electromagnetic heating equipment control method as described in claim 2, characterized in that, The step of adjusting the operating power of the electromagnetic heating device sequentially according to the first preset cycle includes: The operating power of the electromagnetic heating device is adjusted from small to large according to a first preset cycle; or... The operating power of the electromagnetic heating device is adjusted from large to small according to the first preset cycle.

4. The electromagnetic heating equipment control method as described in claim 1, characterized in that, The electromagnetic heating equipment control method further includes: Obtain the current input frequency and determine the current input period corresponding to the current input frequency; The duration of the heating time period is determined based on the duration of the current input cycle.

5. The electromagnetic heating equipment control method as described in claim 4, characterized in that, The step of determining the duration corresponding to the heating time period based on the duration corresponding to the current input cycle includes: Obtain the half-wave period of the current input period and determine the duration of the half-wave period; The duration of the half-wave period is configured to correspond to the duration of the heating time period.

6. The electromagnetic heating equipment control method as described in claim 1, characterized in that, The method of controlling the electromagnetic heating device to operate at the lossless continuous heating power during the target heating time period also includes: The heating time periods within the heating cycle are classified into target heating time periods and non-target heating time periods; Within the heating cycle, the target heating time period and the non-target heating time period are sorted in a first order; The electromagnetic heating device is controlled to operate sequentially during the target heating time period with the continuous heating power without wave loss.

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

8. An electromagnetic heating device, characterized in that, The electromagnetic heating device includes the electromagnetic heating device control device as described in claim 7.

Images