Cooking appliance, and heating control method, device and medium thereof

Abstract

This application discloses a cooking appliance and its heating control method, device, and medium. The method includes: when multiple heating coils are heating in a time-sharing heating mode, obtaining the heating time ratio and heating frequency of each heating coil; determining the number of heating cycles for each heating coil based on the heating time ratio; determining the number of interval heating cycles between adjacent heating coils based on the number of heating cycles of the current heating coil and the next adjacent heating coil; determining the frequency difference between adjacent heating cycles based on the heating frequency of the current heating coil, the heating frequency of the next adjacent heating coil, and the number of interval heating cycles; and determining the heating frequency of each interval heating cycle based on the frequency difference between adjacent heating cycles. Thus, when multiple heating coils are heating in a time-sharing heating mode, the noise caused by the frequency difference between adjacent coils can be reduced to a certain extent.

Description

Technical Field

[0001] This application relates to the field of cooking appliance technology, and in particular to a heating control method for a cooking appliance, a heating control device for a cooking appliance, a computer-readable storage medium, and a cooking appliance. Background Technology

[0002] To improve the compatibility of induction cooktops with different cookware, it's necessary to use flat induction cooktops to heat various cookware evenly. However, ordinary electromagnetic induction heating coils and control methods cannot achieve this. Therefore, multi-segment coils and high-speed time-division heating are needed to achieve flexible power distribution across different areas of the cookware. However, some cookware is made of multiple layers of different materials with varying thicknesses, and the bonding may not be tight. During high-speed time-division heating, the heating frequencies of different heating rings may differ, causing these materials to vibrate under the influence of high-frequency magnetic fields. However, the change in the electrical signal is faster than the change in the vibration frequency of the cookware materials. This can lead to a hysteresis in the cookware's vibration; that is, even when the electrical signal stops resonating, the cookware material may still be vibrating due to inertia. When there is a hysteresis in the cookware's vibration, the heating frequencies of the two rings may overlap during switching, potentially causing superimposed vibrations. This superposition can generate sum and difference frequency vibrations, producing high-frequency, sharp noise and degrading the user experience. Summary of the Invention

[0003] This application aims to at least partially solve one of the technical problems in related technologies. To this end, the first objective of this application is to provide a heating control method for a cooking appliance, which includes a multi-ring heating coil. The method includes: when the multi-ring heating coil is heating in a time-sharing heating mode, obtaining the heating time-sharing ratio and heating frequency of each ring heating coil; determining the number of heating cycles for each ring heating coil based on the heating time-sharing ratio; determining the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil; determining the frequency difference between adjacent heating cycles based on the heating frequency of the current ring heating coil, the heating frequency of the next adjacent ring heating coil, and the number of interval heating cycles; and determining the heating frequency of each interval heating cycle based on the frequency difference between adjacent heating cycles. The control method of this application gradually controls the heating frequency of each heating cycle to reduce noise caused by the frequency difference between adjacent cycles to a certain extent when the multi-ring heating coil is heating in a time-sharing heating mode.

[0004] The second objective of this application is to provide a heating control device for a cooking appliance.

[0005] The third objective of this application is to provide a computer-readable storage medium.

[0006] The fourth objective of this application is to propose a cooking utensil.

[0007] To achieve the above objectives, a first aspect of this application proposes a heating control method for a cooking appliance, the cooking appliance including a multi-ring heating coil. The method includes: when the multi-ring heating coil is heating in a time-sharing heating mode, obtaining the heating time-sharing ratio and heating frequency of each ring heating coil; determining the number of heating cycles of each ring heating coil based on the heating time-sharing ratio; determining the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil; determining the frequency difference between adjacent heating cycles based on the heating frequency of the current ring heating coil, the heating frequency of the next adjacent ring heating coil, and the number of interval heating cycles; and determining the heating frequency of each interval heating cycle based on the frequency difference between adjacent heating cycles.

[0008] According to one embodiment of this application, determining the heating frequency of each interval heating cycle based on the frequency difference between adjacent heating cycles includes: when the heating frequency of the current ring heating coil is less than the heating frequency of the next adjacent ring heating coil, determining the heating frequency of each interval heating cycle based on the sum of the heating frequency of the current ring heating coil and the multiple of the frequency difference.

[0009] According to one embodiment of this application, determining the heating frequency of each interval heating cycle based on the frequency difference between adjacent heating cycles includes: when the heating frequency of the current ring heating coil is greater than the heating frequency of the next adjacent ring heating coil, determining the heating frequency of each interval heating cycle based on the difference between the heating frequency of the current ring heating coil and the multiple of the frequency difference.

[0010] According to one embodiment of this application, determining the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil includes: when both the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil are even numbers, obtaining the sum of the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil as a first sum; and determining the number of interval heating cycles based on half of the first sum.

[0011] According to one embodiment of this application, determining the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil includes: when both the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil are odd, obtaining the sum of the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil as a second sum; determining the number of interval heating cycles based on the sum of half of the second sum and a preset value; wherein, the preset value is 1.

[0012] According to one embodiment of this application, determining the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil includes: if one of the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil is even and the other is odd, obtaining the sum of the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil plus 1 as a third sum; and determining the number of interval heating cycles based on half of the third sum.

[0013] According to one embodiment of this application, determining the frequency difference between adjacent heating cycles based on the heating frequency of the current ring heating coil, the heating frequency of the adjacent next ring heating coil, and the number of interval heating cycles includes: obtaining the absolute value of the difference between the heating frequency of the current ring heating coil and the heating frequency of the adjacent next ring heating coil as a first difference; and using the ratio between the first difference and the number of interval heating coil cycles minus 1 as the frequency difference between adjacent heating cycles.

[0014] According to one embodiment of this application, the above method further includes: when the maximum current of the current ring heating coil exceeds a preset threshold or the maximum current is close to the resonant current, controlling the heating frequency of each heating cycle of the current ring heating coil to remain unchanged.

[0015] According to one embodiment of this application, the total heating power of the multi-ring heating coil is the heating power of the cooking appliance.

[0016] To achieve the above objectives, a second aspect of this application provides a heating control device for a cooking appliance, the cooking appliance including a multi-ring heating coil. The device includes: an acquisition module, used to acquire the heating time-sharing ratio and heating frequency of each ring heating coil when the multi-ring heating coil is heating in a time-sharing heating mode; a first determination module, used to determine the number of heating cycles of each ring heating coil based on the heating time-sharing ratio of each ring heating coil; a second determination module, used to determine the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil; a third determination module, used to determine the frequency difference between adjacent heating cycles based on the heating frequency of the current ring heating coil, the heating frequency of the next adjacent ring heating coil, and the number of interval heating cycles; and a fourth determination module, used to determine the heating frequency of each interval heating cycle based on the frequency difference between adjacent heating cycles.

[0017] To achieve the above objectives, a third aspect of this application provides a computer-readable storage medium storing a heating control program for a cooking appliance, which, when executed by a processor, implements the aforementioned heating control method for the cooking appliance.

[0018] To achieve the above objectives, a fourth aspect of this application provides a cooking appliance, including a memory, a processor, and a heating control program for the cooking appliance stored in the memory and executable on the processor. When the processor executes the heating control program for the cooking appliance, it implements the aforementioned heating control method for the cooking appliance.

[0019] According to embodiments of this application, the cooking appliance and its heating control method, apparatus, and medium include a multi-ring heating coil. The method includes: when the multi-ring heating coil is heating in a time-sharing heating mode, obtaining the heating time-sharing ratio and heating frequency of each ring heating coil; determining the number of heating cycles of each ring heating coil based on the heating time-sharing ratio; determining the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil; determining the frequency difference between adjacent heating cycles based on the heating frequency of the current ring heating coil, the heating frequency of the next adjacent ring heating coil, and the number of interval heating cycles; and determining the heating frequency of each interval heating cycle based on the frequency difference between adjacent heating cycles. The control method of this application gradually controls the heating frequency of each heating cycle to reduce noise caused by the frequency difference between adjacent cycles to a certain extent when the multi-ring heating coil is heating in a time-sharing heating mode. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a dual-segment heating coil and a cookware according to some embodiments of this application;

[0021] Figure 2 This is a schematic diagram showing how a 50Hz sine wave, according to some embodiments of this application, is rectified by a bridge rectifier to form a 100Hz pulsating voltage.

[0022] Figure 3 This is a schematic diagram illustrating the working current of the online heating panel in a time-sharing heating mode according to some embodiments of this application;

[0023] Figure 4 The following are topology diagrams of single-tube (a) and half-bridge (b) induction heating according to some embodiments of this application;

[0024] Figure 5 This is a schematic diagram of a multi-layered composite cookware made of different materials according to some embodiments of this application;

[0025] Figure 6 This is a schematic diagram illustrating the instantaneous switching of two electrical signals when heating the same pot with two rings according to some embodiments of this application;

[0026] Figure 7 This is a schematic diagram showing the superposition of multiple vibration frequencies on a cookware to form sum frequencies and difference frequencies according to some embodiments of this application;

[0027] Figure 8 This is a schematic diagram of the coil current envelope of dual-ring gradual frequency control according to some embodiments of this application;

[0028] Figure 9 This is a flowchart of a heating control method for a cooking appliance according to some embodiments of this application;

[0029] Figure 10 This is a schematic diagram of the coil current envelope after the (k-1)th ring and the kth ring are gradually changed due to frequency locking, according to some embodiments of this application.

[0030] Figure 11 According to some embodiments of this application, in n k-1 and n k Both are even numbers and f k-1 Greater than f k Schematic diagram of the current envelope of the (k-1)th ring and the kth ring;

[0031] Figure 12 According to some embodiments of this application, in n k-1 and n k Both are odd numbers and f k-1 Greater than f k Schematic diagram of the current envelope of the (k-1)th ring and the kth ring;

[0032] Figure 13 According to some embodiments of this application, in nk-1 For an odd number n k is even and f k-1 Greater than f k Schematic diagram of the current envelope of the (k-1)th ring and the kth ring;

[0033] Figure 14 According to some embodiments of this application, in n k-1 For an even number n k It is an odd number and f k-1 Greater than f k Schematic diagram of the current envelope of the (k-1)th ring and the kth ring;

[0034] Figure 15 This is a flowchart of a heating control method for a cooking appliance according to other embodiments of this application;

[0035] Figure 16 This is a block diagram of a heating control device for a cooking appliance according to some embodiments of this application;

[0036] Figure 17 This is a block diagram of a cooking appliance according to some embodiments of this application. Detailed Implementation

[0037] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0038] The following describes in detail, with reference to the accompanying drawings, the cooking appliances and their heating control methods, devices and media according to embodiments of this application.

[0039] In some embodiments, induction heating is achieved by applying Faraday's law of electromagnetic induction, where a changing high-frequency magnetic field generates eddy currents within the metal, thus producing Joule heating. The generated eddy currents are directly related to the magnetic field; the stronger the magnetic field, the larger the eddy currents, resulting in greater heat and stronger heating.

[0040] Biot-Savart law is as follows:

[0041]

[0042] Where Idl represents the current element, dB represents the magnetic induction intensity produced by the current element Idl at a distance r, μ represents the permeability at r, and θ represents the angle between the direction of r and the direction of the current element.

[0043] As can be seen from the above formula, the magnetic induction intensity is inversely proportional to the square of the distance. Therefore, if the inner and outer rings are excited with the same current, eddy currents will be induced in the pot, and the pot wall will inevitably have less heat, resulting in less fire.

[0044] When uniform heating of cookware is required, the heat density of the cookware needs to be similar. (Refer to...) Figure 1 Taking a flat-bottomed wok heated by a dual-segment coil as an example, the dual-segment coil consists of an inner ring and an outer ring. The white area has no winding, the gray area has winding, and the black edge forms the outer frame. For a cookware to achieve uniform heating, the power density at the bottom should be similar to that on the sidewalls. However, different cookware has different power densities at the bottom and sidewalls. To improve the compatibility of induction cooktops with different cookware, it is necessary to use a flat-panel induction cooktop to evenly heat different cookware. However, ordinary coils and control methods cannot achieve this. Therefore, multi-segment coils and high-speed time-division heating are needed to achieve power distribution in different areas of the cookware, adapting to different users and cooking techniques, and meeting the need for flexible power allocation.

[0045] Reference Figure 2 If a 50Hz AC sine wave is rectified to obtain a 100Hz pulsating wave, then the minimum adjustment period is 10ms. If a 60Hz AC sine wave is rectified, the minimum adjustment period is 8.3ms. (Refer to...) Figure 3 Under 50Hz AC power conditions, for uniform heating of a type of cookware, the power distribution for high-speed time-sharing is 40ms for the outer loop and 20ms for the inner loop. The advantage of this high-speed time-sharing heating control strategy is that it allows for flexible adjustment of the inner and outer loop time ratios according to different cookware types, and it avoids difference-frequency noise caused by the different heating frequencies of the inner and outer loops.

[0046] Reference Figure 4 In induction heating, the rectified mains signal is inverted into a high-frequency changing current by a resonant module, thus creating a high-frequency changing magnetic field. In a single-tube topology, high-frequency inversion is achieved by continuously switching the switching transistors via a PPG square wave signal between the gate and source (GS) terminals. In a half-bridge topology, this is achieved by controlling the switching transistors with PWM1 and PWM2 square wave signals. When multiple loops are heated, multiple inverter topologies are used; for example, a double-loop coil can be driven by two sets of single-tube topologies, or a triple-loop coil can be driven by three half-bridge topologies.

[0047] However, refer to Figure 5Some cookware is made of multiple layers of different materials of varying thicknesses, which may not be tightly bonded. Therefore, during high-speed, time-division heating, the heating frequencies of different heating rings may differ, causing these materials to vibrate under the influence of high-frequency magnetic fields at different frequencies. However, the change in the electrical signal is faster than the change in the vibration frequency of the cookware materials. This can lead to a hysteresis in the cookware's vibration; that is, even when the electrical signal stops resonating, the cookware material may still be vibrating due to inertia. When there is a hysteresis in the cookware's vibration, the heating frequencies of the two rings may overlap during switching, potentially resulting in superimposed vibrations. (Refer to...) Figure 6 and Figure 7 When vibrations are superimposed, they may produce sum frequency and difference frequency vibrations. For example, the heating frequency of the inner ring of a double-ring cookware is 25kHz and the heating frequency of the outer ring is 22kHz. Their sum frequency is 47kHz and their difference frequency is 3kHz. 3kHz is a relatively high-frequency and sharp noise within the range of human hearing, which makes the user experience worse.

[0048] Based on this, the control method of this application, when the multi-ring heating coil is heated in a time-sharing heating mode, reduces noise problems caused by the frequency difference between adjacent heating cycles by gradually varying the frequency between adjacent heating cycles (e.g., 10ms for 50Hz mains power) after the power is constant. For example, see... Figure 8 Assume the heating cycles with the minimum peak current of the heating coil are heating cycles 10 and 11, with a heating frequency of 26kHz. Assume the heating cycles with the maximum peak current of the heating coil are heating cycles 4 and 5, with a heating frequency of 22kHz. There are a total of four heating cycles between heating cycles 5 and 10. Therefore, the heating frequencies from heating cycle 5 to heating cycle 10 are set to 22kHz, 22.8kHz, 23.6kHz, 24.4kHz, 25.2kHz, and 26kHz, respectively. The frequency difference between each adjacent heating cycle is fixed at 0.8kHz to reduce noise caused by the frequency difference between adjacent cycles.

[0049] It should be noted that the minimum adjustment cycle can be further reduced, making the heating frequency difference between adjacent heating cycles smaller, thus making users less susceptible to disruption.

[0050] Figure 9 This is a flowchart of a heating control method for a cooking appliance according to some embodiments of this application. (Refer to...) Figure 9 The heating control method for a cooking appliance according to embodiments of this application may include the following steps:

[0051] S110, when the multi-ring heating coil is heated in a time-sharing heating mode, obtain the heating time-sharing ratio of each ring heating coil and the heating frequency of each ring heating coil.

[0052] Specifically, when the multi-ring heating coil operates in a time-sharing heating mode, each ring is heated sequentially according to its heating order and corresponding heating time and frequency, for example, from the inner ring to the outer ring, to achieve time-sharing heating. After controlling the multi-ring heating coil to operate in time-sharing heating mode for a period of time and stabilizing its power, the heating time and frequency of each ring are obtained. This can be achieved, for example, by using sensors built into the cooking appliance to detect the heating time and frequency of each ring; the specific method of obtaining this information is not limited here. The heating time ratio of each ring can be determined based on its heating time.

[0053] For example, suppose the multi-ring heating coil is a double-ring heating coil, including an inner ring and an outer ring, wherein the heating time of the outer ring is 40ms and the heating time of the inner ring is 20ms. Under the condition that the mains power is 50Hz and the minimum adjustment cycle is 10ms, the heating time ratio of each ring heating coil is 4:2.

[0054] S120, the number of heating cycles for each heating coil is determined according to the heating time ratio of each heating coil.

[0055] For example, suppose the multi-ring heating coil has n rings, and the heating time ratio of each ring is n1:n2:…:n n Then the ratio of the number of heating cycles for each ring of heating coil is n1:n2:…:n n In other words, in the time-sharing heating mode, when it is the k-th ring's turn to heat, n rings are continuously heated. k One heating cycle, with a heating frequency of f. k .

[0056] S130, determine the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil.

[0057] Specifically, assuming the (k-1)th ring is the current ring, its heating cycle count is n. k-1 n k-1 The number of rings can be odd or even, with the k-th ring being the next adjacent ring, and the number of heating cycles being n. k n k It can be either odd or even. Therefore, it is necessary to determine the value of n. k-1 and n k Both are odd numbers, n k-1 and n k Both are even numbers, n k-1 For an odd number n k Even number or n k-1 For an even number n k In the four cases where the number is odd, determine the number of heating cycles between adjacent ring heating coils.

[0058] For example, in n k-1 and n k When all are even numbers, the heating cycles of the (k-1)th ring are heating cycle 1, heating cycle 2, ..., heating cycle 3. heating cycle heating cycle …、Heating cycle n k-1 -1. Heating cycle n k-1 The heating cycles of the k-th ring are heating cycle 1, heating cycle 2, ..., heating cycle 3. heating cycle heating cycle …、Heating cycle n k -1. Heating cycle n k The heating cycle between adjacent ring heating coils is equal to the heating cycle of the (k-1)th ring. Heating cycle up to the kth ring The calculation process for the number of heating cycles between adjacent ring heating coils is as follows:

[0059] In n k-1 and n k When all rings are odd numbers, the heating cycles of the (k-1)th ring are heating cycle 1, heating cycle 2, ..., heating cycle 3. heating cycle heating cycle …、Heating cycle n k-1 -1. Heating cycle n k-1 The heating cycles of the k-th ring are heating cycle 1, heating cycle 2, ..., heating cycle 3. heating cycle heating cycle …、Heating cycle n k -1. Heating cycle n k The heating cycle between adjacent ring heating coils is equal to the heating cycle of the (k-1)th ring. Heating cycle up to the kth ring The calculation process for the number of heating cycles between adjacent ring heating coils is as follows:

[0060] In n k-1 For an odd number n k When the number of heating cycles is even, the heating cycles of the (k-1)th ring are heating cycle 1, heating cycle 2, ..., heating cycle 3. heating cycle heating cycle …、Heating cycle n k-1 -1. Heating cycle n k-1The heating cycles of the k-th ring are heating cycle 1, heating cycle 2, ..., heating cycle 3. heating cycle heating cycle …、Heating cycle n k -1. Heating cycle n k The heating cycle between adjacent ring heating coils is equal to the heating cycle of the (k-1)th ring. Heating cycle up to the kth ring The calculation process for the number of heating cycles between adjacent ring heating coils is as follows:

[0061] In n k-1 For an even number n k When the number of heating cycles is odd, the heating cycles of the (k-1)th ring are heating cycle 1, heating cycle 2, ..., heating cycle 3. heating cycle heating cycle …、Heating cycle n k-1 -1. Heating cycle n k-1 The heating cycles of the k-th ring are heating cycle 1, heating cycle 2, ..., heating cycle 3. heating cycle heating cycle …、Heating cycle n k -1. Heating cycle n k The heating cycle between adjacent ring heating coils is equal to the heating cycle of the (k-1)th ring. Heating cycle up to the kth ring The calculation process for the number of heating cycles between adjacent ring heating coils is as follows:

[0062] S140, determine the frequency difference between adjacent heating cycles based on the heating frequency of the current ring heating coil, the heating frequency of the next adjacent ring heating coil, and the number of interval heating cycles.

[0063] Specifically, assuming the (k-1)th ring is the current ring, its heating frequency is f. k-1 The k-th ring is the next adjacent ring, and its heating frequency is f. k The frequency difference between adjacent heating cycles is the heating frequency f of the (k-1)th cycle. k-1 The heating frequency of the k-th ring is f k The ratio of the difference to the number of intervals in the interval heating cycle, where the number of interval heating cycles is the difference between the number of interval heating cycles and 1.

[0064] S150, the heating frequency of each interval heating cycle is determined based on the frequency difference between adjacent heating cycles.

[0065] Specifically, the heating frequency f of the (k-1)th ring k-1 The heating frequency f may be greater than that of the k-th ring. k The heating frequency f of the (k-1)th ring k-1 It may also be less than the heating frequency f of the k-th ring. k The heating frequency f of the (k-1)th ring k-1 Heating frequency f greater than that of the kth ring k In this case, the heating frequency of the interval heating cycle between adjacent ring heating coils gradually decreases, and the heating frequency f of the (k-1)th ring... k-1 Heating frequency f less than that of the kth ring k In this case, the heating frequency of the interval heating cycle between adjacent ring heating coils gradually increases.

[0066] The control method of this application gradually controls the heating frequency of each heating cycle, so as to reduce the noise caused by the difference between adjacent frequencies to a certain extent when the multi-ring heating coil is heated in a time-sharing heating mode.

[0067] In some embodiments, determining the heating frequency of each interval heating cycle based on the frequency difference between adjacent heating cycles includes: when the heating frequency of the current ring heating coil is less than the heating frequency of the next adjacent ring heating coil, determining the heating frequency of each interval heating cycle based on the sum of the heating frequency of the current ring heating coil and the multiple of the frequency difference.

[0068] In some embodiments, determining the heating frequency of each interval heating cycle based on the frequency difference between adjacent heating cycles includes: when the heating frequency of the current ring heating coil is greater than the heating frequency of the next adjacent ring heating coil, determining the heating frequency of each interval heating cycle based on the difference between the heating frequency of the current ring heating coil and the multiple of the frequency difference.

[0069] In the following explanation, n k-1 and n k The example given is an even number, but it is not intended to limit this application. For instance, in n... k-1 and n k When both numbers are even, the heating period between adjacent heating coils is the heating period of the (k-1)th coil. Heating cycle up to the kth ring The number of heating cycles between adjacent ring heating coils is

[0070] N, where the frequency difference between adjacent heating cycles is Δf.

[0071] Heating frequency f in the (k-1)th ring k-1 Heating frequency f less than that of the kth ring k In the case of the (k-1)th ring, the heating cycle Heating cycle up to the kth ring The heating frequencies are f k-1 f k-1 +△f、f k-1 +2△f、…、f k-1 +(N-2)△f、f k .

[0072] Heating frequency f in the (k-1)th ring k-1 Heating frequency f greater than that of the kth ring k In the case of the (k-1)th ring, the heating cycle Heating cycle up to the kth ring The heating frequencies are f k-1 f k-1 -△f、f k-1 -2△f、…、f k-1 -(N-2)△f、f k .

[0073] In some embodiments, determining the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil includes: when both the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil are even numbers, obtaining the sum of the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil as a first sum; and determining the number of interval heating cycles based on half of the first sum.

[0074] For example, in n k-1 and n k When all numbers are even, the formula for calculating the number of heating cycles between adjacent ring heating coils is as follows:

[0075]

[0076] Where, N k-1，k n represents the number of heating cycles between adjacent ring heating coils. k-1 n represents the number of heating cycles of the current ring heating coil. k This indicates the number of heating cycles of the adjacent next heating coil.

[0077] In some embodiments, determining the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil includes: when both the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil are odd, obtaining the sum of the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil as a second sum; determining the number of interval heating cycles based on the sum of half of the second sum and a preset value; wherein the preset value is 1.

[0078] For example, in n k-1 and n k When all numbers are odd, the formula for calculating the number of heating cycles between adjacent ring heating coils is as follows:

[0079]

[0080] Where, N k-1，k n represents the number of heating cycles between adjacent ring heating coils. k-1 n represents the number of heating cycles of the current ring heating coil. k This indicates the number of heating cycles of the adjacent next heating coil.

[0081] It should be noted that in n k-1 and n k When all numbers are odd, the formula for calculating the number of heating cycles between adjacent ring heating coils can also be as follows:

[0082]

[0083] Where, N k-1，k n represents the number of heating cycles between adjacent ring heating coils. k-1 n represents the number of heating cycles of the current ring heating coil. k This indicates the number of heating cycles of the adjacent next heating coil.

[0084] In n k-1 and n k When all numbers are odd, the heating interval between adjacent ring heating coils can be the heating cycle of the (k-1)th ring. Heating cycle up to the kth ring It can also be the heating cycle of the (k-1)th ring. Heating cycle up to the kth ring

[0085] In some embodiments, determining the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil includes: if one of the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil is even and the other is odd, obtaining the sum of the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil plus 1 as a third sum; and determining the number of interval heating cycles based on half of the third sum.

[0086] For example, in n k-1 For an even number n k It is an odd number, or n k-1 For an odd number n k When the number is even, the formula for calculating the number of heating cycles between adjacent ring heating coils is as follows:

[0087]

[0088] Where, N k-1，k n represents the number of heating cycles between adjacent ring heating coils. k-1 n represents the number of heating cycles of the current ring heating coil. k This indicates the number of heating cycles of the adjacent next heating coil.

[0089] In some embodiments, determining the frequency difference between adjacent heating cycles based on the heating frequency of the current ring heating coil, the heating frequency of the adjacent next ring heating coil, and the number of interval heating cycles includes: obtaining the absolute value of the difference between the heating frequency of the current ring heating coil and the heating frequency of the adjacent next ring heating coil as a first difference; and using the ratio between the first difference and the number of interval heating coil cycles minus 1 as the frequency difference between adjacent heating cycles.

[0090] For example, suppose the (k-1)th ring is the current ring, and its heating frequency is f. k-1 The k-th ring is the next adjacent ring, and its heating frequency is f. k The formula for calculating the frequency difference between adjacent heating cycles is as follows:

[0091]

[0092] Where, △f k-1，k N represents the frequency difference between adjacent heating cycles. k-1，k f represents the number of heating cycles between adjacent ring heating coils. k-1 f represents the current heating frequency of the ring heating coil. k This indicates the heating frequency of the adjacent next heating coil.

[0093] In some embodiments, the method further includes: when the maximum current of the current ring heating coil exceeds a preset threshold or the maximum current is close to the resonant current, controlling the heating frequency of each heating cycle of the current ring heating coil to remain unchanged. The preset threshold can be determined according to actual conditions and is not specifically limited here.

[0094] Specifically, while maintaining a constant total power for each ring's heating cycle, the current in the coil and the operating status of the resonant system must be monitored in real time when the frequency is reduced. If the maximum current of the current ring's heating coil exceeds a preset threshold or approaches the resonant current (the resonant system has moved from the inductive region to the resonant point), the frequency must be locked and cannot be further reduced. The heating frequency of each heating cycle of the current ring's heating coil must be kept constant, and the gradual frequency sequence must be recalculated while ensuring the total power remains constant. For example, refer to... Figure 10 The frequency of the (k-1)th ring is locked and cannot be lowered further. The heating frequency is gradually changed only for the last heating cycle of the (k-1)th ring and the kth ring.

[0095] In some embodiments, the total heating power of the multi-ring heating coil is the heating power of the cooking appliance.

[0096] Specifically, adjusting the heating frequency of each heating cycle will change the power of each ring's heating coil. The power in each ring's time-sharing heating cycle will differ from the initial total power when heating at a fixed frequency. Therefore, it is necessary to adjust each key frequency point through power closed-loop control to ensure that the total power throughout the entire time-sharing heating cycle is the same as the previous total power. The key frequency is the center frequency of each ring's time-sharing heating cycle; for example, in n... k When the number is even, the heating cycle of the k-th ring The corresponding heating frequency is the center frequency of the k-th ring time-division heating cycle.

[0097] As a concrete example, in n k-1 and n k When both numbers are even, the heating period between adjacent heating coils is the heating period of the (k-1)th coil. Heating cycle up to the kth ring Reference Figure 11 , in f k-1 Greater than f k In the case where k is greater than 2, the first to the second element of the (k-1)th ring... The envelope forms a gradually changing frequency sequence with the second half of the (k-2)th ring; while the kth ring's... From the nth k Each envelope forms a gradually changing frequency sequence with the first half of the k+1th ring.

[0098] As another concrete example, in n k-1 and n k When both rings are odd numbers, the heating period between adjacent rings is the heating period of the (k-1)th ring. Heating cycle up to the kth ring Reference Figure 12 , in f k-1 Greater than f k In the case where k is greater than 2, the first to the second element of the (k-1)th ring... The envelope forms a gradually changing frequency sequence with the (k-2)th ring; while the kth ring's... From the nth k Each envelope forms a gradually changing frequency sequence with the first half of the k+1th ring.

[0099] As another concrete example, in n k-1 For an odd number n k When the number is even, the heating period between adjacent rings of heating coils is the heating period of the (k-1)th ring. Heating cycle up to the kth ring Reference Figure 13 , in f k-1 Greater than f k In the case where k is greater than 2, the first to the second element of the (k-1)th ring... The envelope forms a gradually changing frequency sequence with the second half of the (k-2)th ring; while the kth ring's... From the nth k Each envelope forms a gradually changing frequency sequence with the first half of the k+1th ring.

[0100] As yet another concrete example, in n k-1 For an even number n k When the number of rings is odd, the heating period between adjacent rings is the heating period of the (k-1)th ring. Heating cycle up to the kth ring Reference Figure 14 , in f k-1 Greater than f k In the case where k is greater than 2, the first to the second element of the (k-1)th ring... The envelope forms a gradually changing frequency sequence with the (k-2)th ring; while the kth ring's... From the nth to the nth k Each envelope forms a gradually changing frequency sequence with the first half of the k+1th ring.

[0101] As another concrete example, refer to Figure 15 The heating control method for the cooking appliance in this application embodiment may further include the following steps:

[0102] S201, Begin.

[0103] S202, determine whether the current function requires time-sharing heating. If yes, execute S203; otherwise, execute S204.

[0104] S203, determine whether variable frequency heating is required. If yes, proceed to S205; otherwise, proceed to S206.

[0105] S204, heating is controlled according to the default heating mode.

[0106] S205 first heats for a period of time, obtains the heating time ratio and heating frequency of each ring heating coil when the power of each ring is stable, and then performs gradual frequency conversion heating control between adjacent rings.

[0107] S206, normal time-sharing heating control is in operation.

[0108] S207, End.

[0109] In summary, the control method of this application gradually controls the heating frequency of each heating cycle, so as to reduce the noise caused by the difference between adjacent frequencies to a certain extent when the multi-ring heating coil is heated in a time-sharing heating mode.

[0110] Corresponding to the above embodiments, this application also proposes a heating control device for cooking appliances.

[0111] Reference Figure 16 The heating control device 300 for cooking appliances includes: an acquisition module 310, a first determination module 320, a second determination module 330, a third determination module 340, and a fourth determination module 350.

[0112] The acquisition module 310 is used to acquire the heating time-sharing ratio and heating frequency of each ring heating coil when the multi-ring heating coil is heated in a time-sharing heating mode. The first determining module 320 is used to determine the number of heating cycles for each ring heating coil based on its heating time-sharing ratio. The second determining module 330 is used to determine the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil. The third determining module 340 is used to determine the frequency difference between adjacent heating cycles based on the heating frequency of the current ring heating coil, the heating frequency of the next adjacent ring heating coil, and the number of interval heating cycles. The fourth determining module 350 is used to determine the heating frequency of each interval heating cycle based on the frequency difference between adjacent heating cycles.

[0113] According to one embodiment of this application, the fourth determining module 350 is specifically used to determine the heating frequency of each interval heating cycle based on the sum of the heating frequency of the current ring heating coil and the multiple of the frequency difference when the heating frequency of the current ring heating coil is less than the heating frequency of the next adjacent ring heating coil.

[0114] According to one embodiment of this application, the fourth determining module 350 is specifically used to determine the heating frequency of each interval heating cycle based on the difference between the heating frequency of the current ring heating coil and the multiple of the frequency difference when the heating frequency of the current ring heating coil is greater than the heating frequency of the next adjacent ring heating coil.

[0115] According to one embodiment of this application, the second determining module 330 is specifically used to, when the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil are both even numbers, obtain the sum of the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil as a first sum value; and determine the number of interval heating cycles based on half of the first sum value.

[0116] According to one embodiment of this application, the second determining module 330 is specifically used to: when the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil are both odd, obtain the sum of the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil as a second sum value; determine the number of interval heating cycles based on the sum of half of the second sum value and a preset value; wherein, the preset value is 1.

[0117] According to one embodiment of this application, the second determining module 330 is specifically used to, when the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil are both even and odd, obtain the sum of the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil plus 1 as a third sum; and determine the number of interval heating cycles based on half of the third sum.

[0118] According to one embodiment of this application, the third determining module 340 is specifically used to obtain the absolute value of the difference between the heating frequency of the current ring heating coil and the heating frequency of the next adjacent ring heating coil as a first difference; and to use the ratio between the first difference and the number of interval heating coil cycles minus 1 as the frequency difference between adjacent heating cycles.

[0119] According to one embodiment of this application, when the maximum current of the current ring heating coil exceeds a preset threshold or the maximum current is close to the resonant current, the heating frequency of each heating cycle of the current ring heating coil is controlled to remain unchanged.

[0120] According to one embodiment of this application, the total heating power of the multi-ring heating coil is the heating power of the cooking appliance.

[0121] It should be noted that the above explanation of the embodiments and beneficial effects of the heating control method for cooking appliances also applies to the heating control device of the cooking appliances in the embodiments of this application. To avoid redundancy, it will not be elaborated in detail here.

[0122] Corresponding to the above embodiments, this application also proposes a computer-readable storage medium.

[0123] The present application provides a computer-readable storage medium storing a heating control program for a cooking appliance, which, when executed by a processor, implements the aforementioned heating control method for the cooking appliance.

[0124] It should be noted that the above explanation of the embodiments and beneficial effects of the heating control method for cooking appliances also applies to the computer-readable storage medium of the embodiments of this application. To avoid redundancy, detailed explanations are not provided here.

[0125] Corresponding to the above embodiments, this application also proposes a cooking utensil.

[0126] See Figure 17 As shown, the cooking appliance 400 of this application includes a memory 410, a processor 420, and a heating control program for the cooking appliance stored in the memory 410 and executable on the processor 420. When the processor executes the heating control program for the cooking appliance, it implements the aforementioned heating control method for the cooking appliance.

[0127] It should be noted that the above explanation of the embodiments and beneficial effects of the heating control method for cooking appliances also applies to the cooking appliances in the embodiments of this application. To avoid redundancy, they will not be elaborated in detail here.

[0128] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0129] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0130] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0131] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0132] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0133] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A heating control method for a cooking appliance, characterized in that, The cooking appliance includes a multi-ring heating coil, and the method includes: When the multi-ring heating coil is heated in a time-sharing heating mode, the heating time ratio of each ring heating coil and the heating frequency of each ring heating coil are obtained. The number of heating cycles for each heating coil is determined based on the heating time-sharing ratio of each heating coil. The number of heating cycles between adjacent ring heating coils is determined based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil. The frequency difference between adjacent heating cycles is determined based on the heating frequency of the current ring heating coil, the heating frequency of the next adjacent ring heating coil, and the number of interval heating cycles. The heating frequency for each interval heating cycle is determined based on the frequency difference between adjacent heating cycles.

2. The method according to claim 1, characterized in that, Determining the heating frequency for each interval heating cycle based on the frequency difference between adjacent heating cycles includes: When the heating frequency of the current ring heating coil is less than the heating frequency of the next adjacent ring heating coil, the heating frequency of each interval heating cycle is determined based on the sum of the multiples of the heating frequency of the current ring heating coil and the frequency difference.

3. The method according to claim 1, characterized in that, The step of determining the heating frequency for each interval heating cycle based on the frequency difference between adjacent heating cycles includes: When the heating frequency of the current ring heating coil is greater than the heating frequency of the next adjacent ring heating coil, the heating frequency of each interval heating cycle is determined based on the difference between the heating frequency of the current ring heating coil and the multiple of the frequency difference.

4. The method according to claim 1, characterized in that, The number of heating cycles between adjacent heating coils is determined based on the number of heating cycles of the current heating coil and the number of heating cycles of the next adjacent heating coil, including: When both the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil are even numbers, the sum of the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil is obtained as the first sum value; The number of interval heating cycles is determined based on half of the first sum.

5. The method according to claim 1, characterized in that, The number of heating cycles between adjacent heating coils is determined based on the number of heating cycles of the current heating coil and the number of heating cycles of the next adjacent heating coil, including: When both the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil are odd, the sum of the number of heating cycles of the current ring heating coil and the number of heating cycles of the adjacent next ring heating coil is obtained as a second sum value. The number of interval heating cycles is determined by the sum of half of the second sum and a preset value; wherein the preset value is 1.

6. The method according to claim 1, characterized in that, The number of heating cycles between adjacent heating coils is determined based on the number of heating cycles of the current heating coil and the number of heating cycles of the next adjacent heating coil, including: If one of the heating cycles of the current ring heating coil and the heating cycles of the adjacent next ring heating coil is even and the other is odd, the sum of the heating cycles of the current ring heating coil and the heating cycles of the adjacent next ring heating coil plus 1 is obtained as the third sum value. The number of interval heating cycles is determined based on half of the third sum value.

7. The method according to claim 1, characterized in that, Determining the frequency difference between adjacent heating cycles based on the heating frequency of the current ring heating coil, the heating frequency of the next adjacent ring heating coil, and the number of interval heating cycles includes: Obtain the absolute value of the difference between the heating frequency of the current ring heating coil and the heating frequency of the next adjacent ring heating coil, and use it as the first difference value; The frequency difference between adjacent heating cycles is determined by the ratio between the first difference and the number of cycles of the interval heating coil minus 1.

8. The method according to claim 1, characterized in that, Also includes: When the maximum current of the current ring heating coil exceeds a preset threshold or is close to the resonant current, the heating frequency of the current ring heating coil in each heating cycle is kept constant.

9. The method according to claim 1, characterized in that, in, The total heating power of the multi-ring heating coil is the heating power of the cooking appliance.

10. A heating control device for a cooking appliance, characterized in that, The cooking appliance includes a multi-ring heating coil, and the device includes: The acquisition module is used to acquire the heating time ratio and heating frequency of each ring heating coil when the multi-ring heating coil is heated in a time-sharing heating mode. The first determining module is used to determine the number of heating cycles for each heating coil based on the heating time division ratio of each heating coil. The second determining module is used to determine the number of interval heating cycles between adjacent ring heating coils based on the number of heating cycles of the current ring heating coil and the number of heating cycles of the next adjacent ring heating coil. The third determining module is used to determine the frequency difference between adjacent heating cycles based on the heating frequency of the current ring heating coil, the heating frequency of the next adjacent ring heating coil, and the number of interval heating cycles. The fourth determining module is used to determine the heating frequency of each interval heating cycle based on the frequency difference between adjacent heating cycles.

11. A computer-readable storage medium, characterized in that, It stores a heating control program for a cooking appliance, which, when executed by a processor, implements the heating control method for a cooking appliance according to any one of claims 1-9.

12. A cooking utensil, characterized in that, The cooking appliance includes a memory, a processor, and a heating control program for the cooking appliance stored in the memory and executable on the processor. When the processor executes the heating control program for the cooking appliance, it implements the heating control method for the cooking appliance according to any one of claims 1-9.

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