A pot recognition method and device, an electromagnetic heating device and a storage medium

Abstract

The application discloses a pot recognition method and device, an electromagnetic heating device and a storage medium. The method is applied to an electromagnetic heating device, and the method comprises the following steps: detecting a target current parameter associated with a switch module; wherein the switch module is connected with a resonance module of the electromagnetic heating device, and the conduction or cutoff of the switch module is used for controlling the resonance module to oscillate to heat a pot; comparing the target current parameter with a preset threshold value, and determining a pot type based on a comparison result.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to a cookware identification method, device, electromagnetic heating equipment, and storage medium. Background Technology

[0002] Identifying the type of cookware used in an induction cooker helps its main control core employ different control methods based on the characteristics of different cookware, thereby improving the heating performance of the induction cooker. Existing methods for identifying cookware typically detect the pulse width of a single synchronous voltage across the coil, but this method can only simply identify whether the cookware is made of iron or steel, and cannot achieve further precise identification. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a cookware identification method, device, electromagnetic heating equipment, and storage medium, aiming to achieve precise and accurate identification of the type of cookware for induction cookers.

[0004] The technical solution of this invention is implemented as follows:

[0005] In a first aspect, embodiments of the present invention provide a cookware identification method, the method being applied to an electromagnetic heating device, the method comprising:

[0006] Detect target current parameters associated with the switching module; wherein the switching module is connected to the resonant module of the electromagnetic heating device, and the switching module’s on or off state is used to control the resonant module to oscillate in order to heat the cookware;

[0007] The target current parameter is compared with a preset threshold, and the cookware type is determined based on the comparison result.

[0008] In some implementations, the target current parameter includes at least one of the following: reverse current value, forward current rise slope; the step of comparing the target current parameter with a preset threshold and determining the cookware type based on the comparison result includes at least one of the following: comparing the reverse current value with a first preset threshold, and determining the cookware as a high-coupling-resistance type cookware if the comparison result shows that the reverse current value is less than the first preset threshold, and determining the cookware as a low-coupling-resistance type cookware if the comparison result shows that the reverse current value is greater than or equal to the first preset threshold; comparing the forward current rise slope with a second preset threshold, and determining the cookware as a high-coupling-inductance type cookware if the comparison result shows that the forward current rise slope is less than the second preset threshold, and determining the cookware as a low-coupling-inductance type cookware if the comparison result shows that the forward current rise slope is greater than or equal to the second preset threshold.

[0009] In some implementations, the target current parameter includes at least one of the following: reverse current value, forward current rise slope; the detection of the target current parameter associated with the switching module includes: detecting the reverse voltage value of the switching module, determining the reverse current value based on the reverse voltage value; and / or, acquiring the forward current through an AD module, and calculating the forward current rise slope based on the acquired forward current.

[0010] In some implementations, the method further includes: obtaining the target operating power and target voltage range of the electromagnetic heating device; correspondingly, detecting the target current parameter associated with the switching module includes: detecting the target current parameter associated with the switching module when the input voltage of the electromagnetic heating device is within the target voltage range and during the heating of the cookware according to the target operating power.

[0011] In some implementations, the switching module is an insulated gate bipolar transistor (IGBT) module.

[0012] Secondly, embodiments of the present invention provide a cookware identification device, the device comprising:

[0013] Resonant module;

[0014] A switching module connected to the resonant module, wherein the switching module is turned on or off to control the oscillation of the resonant module to heat the cookware;

[0015] The detection and control module connected to the switch module is used to detect the target current parameter; compare the target current parameter with a preset threshold, and determine the cookware type based on the comparison result.

[0016] In some implementations, the target current parameter includes at least one of the following: reverse current value, forward current rise slope; the detection control module includes a current detection unit and a control unit; wherein, the current detection unit is used to detect the reverse current value, compare the reverse current value with a first preset threshold, and send a reversal signal to the control unit when the comparison result is that the reverse current value is greater than or equal to the first preset threshold; and / or, is used to collect the forward current;

[0017] The control unit is configured to determine the cookware type based on whether the reverse signal is received, and / or to calculate the forward current rise slope based on the forward current collected by the current detection unit, compare the forward current rise slope with a second preset threshold, and determine the cookware type based on the comparison result.

[0018] In some embodiments, the control unit is configured to determine the cookware type according to at least one of the following: determining the cookware as a high-coupling-resistance type when the inversion signal is not received; determining the cookware as a low-coupling-resistance type when the inversion signal is received; determining the cookware as a high-coupling-inductance type when the comparison result shows that the forward current rise slope is less than the second preset threshold; and determining the cookware as a low-coupling-inductance type when the comparison result shows that the forward current rise slope is greater than or equal to the second preset threshold.

[0019] In some implementations, the current detection unit is used to detect the reverse voltage value of the switching module, determine the reverse current value based on the reverse voltage value, and / or acquire the forward current through the AD module.

[0020] In some implementations, the control unit is further configured to acquire the target operating power and target voltage range of the electromagnetic heating device; and to enable the current detection unit when the input voltage of the electromagnetic heating device is within the target voltage range and the cookware is heated according to the target operating power.

[0021] In some implementations, the switching module is an IGBT module, the input terminal of the current detection unit is connected to the emitter of the IGBT module, and the output terminal of the current detection unit is connected to the control unit; the emitter of the IGBT module is grounded through a voltage divider resistor.

[0022] Thirdly, embodiments of the present invention provide an electromagnetic heating device, which includes the cookware identification device described in the second aspect.

[0023] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the method described in the first aspect.

[0024] Fifthly, embodiments of the present invention provide a computer program product, including a computer program that, when executed by a processor, implements the steps of the method described in the first aspect.

[0025] The technical solution provided by this invention involves an electromagnetic heating device detecting a target current parameter associated with a switching module. The switching module is connected to a resonant module within the electromagnetic heating device. The switching module controls the resonant module to oscillate and heat the cookware by switching it on or off. A comparison result is obtained by comparing the target current parameter associated with the switching module with a corresponding preset threshold. Based on the comparison result, the cookware type is identified. By identifying the cookware type using the target current parameter of the switching module, a more refined and accurate identification of the cookware type is achieved. Attached Figure Description

[0026] Figure 1 This is a flowchart illustrating the cookware identification method according to an embodiment of the present invention;

[0027] Figure 2 This is a flowchart illustrating a cookware identification method in an application example of an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the cookware recognition device according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the protection circuit of the cookware identification device according to an embodiment of the present invention. Detailed Implementation

[0030] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0031] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0032] The terms “first,” “second,” etc., used in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0034] This invention provides a cookware identification method. Figure 1 This is a flowchart illustrating the cookware identification method according to an embodiment of the present invention; as shown below. Figure 1 As shown, the method is applied to an electromagnetic heating device, and the method includes:

[0035] Step 101: Detect the target current parameter associated with the switching module; wherein the switching module is connected to the resonant module of the electromagnetic heating device, and the switching module is turned on or off to control the resonant module to oscillate in order to heat the pot.

[0036] Here, the electromagnetic heating device in this embodiment of the invention can be a kitchen appliance that uses the principle of electromagnetic induction to convert electrical energy into heat energy, thereby heating metal cookware. For example, the electromagnetic heating device can be an induction cooker that heats cookware on an induction cooker. This embodiment of the invention does not impose any specific limitations on this.

[0037] In this embodiment, the electromagnetic heating device needs to detect the target current parameter associated with the switching module. The switching module is one of the core modules of the electromagnetic heating device, and it is electrically connected to the resonant module of the electromagnetic heating device. The switching module controls the oscillation of the resonant module by turning the switching module on or off, thereby heating the cookware.

[0038] In some alternative embodiments, the switching module is an Insulated Gate Bipolar Transistor (IGBT) module.

[0039] In this embodiment, the switching module in the electromagnetic heating device can be an IGBT module. The IGBT module has high-frequency switching capability, supporting switching operations at kilohertz (kHz) levels, meeting the high-frequency requirements of electromagnetic heating. For example, in the electromagnetic heating device, the collector (C) of the IGBT module, serving as the switching module, is connected to one end of the resonant module, and the emitter (E) of the IGBT module is grounded through a voltage divider resistor; the other end of the resonant module is connected to the mains power through a rectifier module. The resonant module includes at least a parallel inductor (also called a coil) and a capacitor. The oscillation of the resonant module is controlled by the conduction or cutoff of the IGBT module to heat the cookware.

[0040] For example, the principle of heating metal cookware based on an IGBT module in the electromagnetic heating device of this invention includes at least the following: repeatedly applying high and low voltage levels to the IGBT module to control its repeated on / off switching; wherein, applying a high voltage level turns the IGBT module on, and applying a low voltage level turns it off. The repeated on / off switching of the IGBT module causes resonance in the resonant module electrically connected to it, thereby generating a continuously changing magnetic field through a high-frequency current in the resonant module, which in turn generates a changing eddy current electric field at the bottom of the pot, thus heating the metal cookware through eddy currents.

[0041] Based on the above heating process, it can be understood that the electromagnetic heating device in the embodiments of the present invention can identify the cookware placed on the electromagnetic heating device by detecting the target current parameter associated with the switching module (i.e., the IGBT module) and reflecting the relevant physical characteristics of the electromagnetic heating device caused by the cookware (specifically, the target current parameter can reflect the relevant physical characteristics of the resonant module in the electromagnetic heating device caused by the cookware).

[0042] In some alternative embodiments, the target current parameter includes at least one of the following: reverse current value, forward current rise slope; the detection of the target current parameter associated with the switching module includes: detecting the reverse voltage value of the switching module, determining the reverse current value based on the reverse voltage value; and / or, acquiring the forward current through the AD module, and calculating the forward current rise slope based on the acquired forward current.

[0043] In this embodiment, on the one hand, the electromagnetic heating device can determine the reverse current value associated with the switching module by detecting the reverse voltage value of the switching module, specifically based on Ohm's law. (Where, U represents voltage, which can be the reverse voltage value; I represents current, which can be the reverse current value; and R represents resistance, which can be the coupling resistance between the resonant module and the cookware.) The reverse current is obtained from the detected reverse voltage value. On the other hand, the electromagnetic heating device can also acquire the forward current through an AD module, and calculate the forward current rise slope associated with the switching module based on the acquired forward current. The AD module can also be called an AD conversion module, where A represents analog signals and D represents digital signals; therefore, the AD module can also be called an analog-to-digital conversion module.

[0044] For example, the emitter (E-terminus) of the switching module (such as the IGBT module) is grounded through a voltage divider resistor. That is, after the voltage is divided by the voltage divider resistor, the current passing through the switching module is converted into voltage. After being boosted by the bias resistor of the switching module, the current is detected (such as reverse current or forward current detection).

[0045] When a reverse current flows through the switching module, the reverse current value is determined based on the detected reverse voltage and the coupling resistance of the resonant module. The reverse current value is related to the coupling resistance between the resonant module used to heat the cookware in the electromagnetic heating device and the cookware placed on the electromagnetic heating device (i.e., the cookware to be identified).

[0046] Specifically, according to Ohm's Law It is known that the reverse current value I is inversely proportional to the coupling resistance R. When the reverse current value flowing through the switching module is large, the coupling resistance between the resonant module and the cookware to be identified is small; when the reverse current value flowing through the switching module is small, the coupling resistance between the resonant module and the cookware to be identified is large. In other words, the reverse current value can be used to reflect the magnitude of the coupling resistance between the resonant module in the electromagnetic heating device and the cookware to be identified. The magnitude of the coupling resistance is related to the type of cookware to be identified. Therefore, the type of cookware to be identified is determined based on the reverse current value. The specific identification method will be explained in detail later.

[0047] When a forward current flows through the switching module, the electromagnetic heating device can digitally sample the forward current through the AD module. Based on the digitally sampled forward current value, the upward slope of the forward current over a certain period of time can be calculated. The upward slope of the forward current represents the rate of change of the forward current, which is related to the coupling inductance between the resonant module in the electromagnetic heating device used to heat the cookware and the cookware placed on the electromagnetic heating device (i.e., the cookware to be identified).

[0048] Specifically, according to the inductor voltage formula It can be seen that the slope of the forward current rise The coupling inductance is inversely proportional to the coupling inductance L. When the slope of the forward current flowing through the switching module is large, the coupling inductance between the resonant module and the cookware to be identified is small; when the slope of the forward current flowing through the switching module is small, the coupling inductance between the resonant module and the cookware to be identified is large. In other words, the slope of the forward current can be used to reflect the magnitude of the coupling inductance between the resonant module and the cookware to be identified in the electromagnetic heating device. The magnitude of the coupling inductance is related to the type of cookware to be identified. Therefore, the type of cookware to be identified is determined based on the slope of the forward current. The specific identification method will be explained in detail later.

[0049] In some alternative embodiments, the method further includes: obtaining the target operating power and target voltage range of the electromagnetic heating device; correspondingly, detecting the target current parameter associated with the switching module includes: detecting the target current parameter associated with the switching module when the input voltage of the electromagnetic heating device is within the target voltage range and the cookware is heated according to the target operating power.

[0050] In this embodiment, during the normal operation of the electromagnetic heating device, considering factors other than coupling inductance and coupling resistance that affect the forward and reverse currents, factors that can influence the magnitude of the forward and reverse currents include input voltage and operating power. Therefore, before detecting the target current parameter, the electromagnetic heating device needs to obtain its target operating power and target voltage range, and control the operation of the electromagnetic heating device according to the target voltage range and target operating power. This embodiment of the invention does not impose specific limitations on the method of obtaining the target operating power and target voltage range.

[0051] The target operating power refers to the operating power of the electromagnetic heating device when identifying cookware. The target operating power range can be preset to [1600W, 1800W], with the unit being watts (W). Optionally, the target operating power can be 1700W. The target voltage range refers to the voltage range of the industrial frequency alternating current (AC, also known as mains power) input to the electromagnetic heating device. The target voltage range can typically be preset to [198V, 242V], with the unit being volts (V).

[0052] The target operating power and target voltage range can serve as prerequisites for the electromagnetic heating device to identify cookware. In other words, the cookware identification process of this embodiment of the invention can only proceed if the input voltage of the electromagnetic heating device is detected to be within the target voltage range and the cookware to be identified is heated according to the target operating power.

[0053] Step 102: Compare the target current parameter with the preset threshold, and determine the cookware type based on the comparison result.

[0054] In this embodiment, during the heating process of the electromagnetic heating device for the cookware to be identified, after detecting the target current parameter associated with the switch module, the detected target current parameter is compared with the corresponding preset threshold to obtain the comparison result, and the type of cookware to be identified is identified based on the comparison result.

[0055] In some alternative embodiments, the target current parameter includes at least one of the following: reverse current value, forward current rise slope; step 102 includes at least one of the following:

[0056] The reverse current value is compared with a first preset threshold. If the comparison result shows that the reverse current value is less than the first preset threshold, the cookware is determined to be a high-coupling-resistance cookware. If the comparison result shows that the reverse current value is greater than or equal to the first preset threshold, the cookware is determined to be a low-coupling-resistance cookware.

[0057] The cookware is determined to be a high-coupling inductance cookware if the slope of the forward current rise is less than the second preset threshold, and a low-coupling inductance cookware if the slope of the forward current rise is greater than or equal to the second preset threshold.

[0058] In this embodiment, the target current parameters detected by the electromagnetic heating device may include the reverse current value and / or the forward current rise slope, thereby determining the type of cookware to be identified based on the detected reverse current value and the corresponding first preset threshold, and / or determining the type of cookware to be identified based on the detected forward current rise slope and the corresponding second preset threshold.

[0059] The reverse current value is inversely proportional to the coupling resistance, and can be used to reflect the magnitude of the coupling resistance between the resonant module in the electromagnetic heating device and the cookware to be identified. The forward current rise slope is inversely proportional to the coupling inductance, and can be used to reflect the magnitude of the coupling inductance between the resonant module in the electromagnetic heating device and the cookware to be identified. The reverse current value and the forward current rise slope have been explained in detail above, and will not be repeated here.

[0060] Specifically, when the target current parameter is a reverse current value, the electromagnetic heating device compares the detected reverse current value with the corresponding first preset threshold to obtain a comparison result. Based on the relationship between the reverse current value and the coupling resistance, if the comparison result shows that the reverse current value is less than the first preset threshold, it indicates that the coupling resistance between the resonant module used for heating in the electromagnetic heating device and the cookware to be identified is large, thus determining that the cookware is a high-coupling-resistance type cookware (which can be simply referred to as a high-resistance cookware). If the comparison result shows that the reverse current value is greater than or equal to the first preset threshold, it indicates that the coupling resistance between the resonant module used for heating in the electromagnetic heating device and the cookware to be identified is small, thus determining that the cookware is a low-coupling-resistance type cookware (which can be simply referred to as a low-resistance cookware).

[0061] In other optional embodiments, comparing the reverse current value with a first preset threshold can also be equivalent to comparing the reverse voltage value with a reverse preset reference voltage value corresponding to the first preset threshold. Specifically, when the reverse voltage value is greater than the reverse preset reference voltage value, the cookware can be determined to be a high-coupling-resistance cookware (or simply a high-resistance cookware); when the reverse voltage value is less than or equal to the reverse preset reference voltage value, the cookware can be determined to be a low-coupling-resistance cookware (or simply a low-resistance cookware).

[0062] The reverse preset reference voltage value is less than the forward voltage under static conditions. For example, the initial difference between the initial reverse voltage and the forward voltage under static conditions is determined based on the reverse current to be detected, typically ranging from 100 mV to 300 mV. Optionally, the difference between the reverse preset reference voltage value and the forward voltage under static conditions can be 150 mV. In this embodiment, the reverse preset reference voltage value can be determined using this difference, and subsequently, the first preset threshold can be determined based on the reverse preset reference voltage value.

[0063] In this embodiment, as the reverse current increases, the reverse voltage continuously decreases. When the reverse current increases to its corresponding first preset threshold, a reversal signal can be generated to indicate that the coupling resistance between the resonant module and the cookware to be identified is too small, thus meeting the condition for a low-coupling-resistance cookware. That is, by acquiring the reversal signal, the cookware can be directly identified as a low-coupling-resistance cookware. It is understood that if no reversal signal is acquired during the cookware identification process, the cookware can be directly identified as a high-coupling-resistance cookware.

[0064] It should be noted that the embodiments of the present invention do not impose specific restrictions on the first preset threshold corresponding to the reverse current value. It can be set in advance based on the target operating power, the target voltage range, and the preset reverse reference voltage value. Typically, the first preset threshold I can be preset within the range of [25A, 35A]. REF For example, the first preset threshold can be preset to 30A, where the unit is ampere (A).

[0065] When the detected target current parameter is the forward current rise slope, the electromagnetic heating device, after comparing the detected forward current rise slope with the corresponding second preset threshold to obtain a comparison result, determines the cookware as a high-coupling-inductance cookware based on the relationship between the forward current rise slope and the coupling inductance. If the comparison result shows that the forward current rise slope is less than the second preset threshold, it indicates that the coupling inductance between the resonant module used for heating in the electromagnetic heating device and the cookware to be identified is large. If the comparison result shows that the forward current rise slope is greater than or equal to the second preset threshold, it indicates that the coupling inductance between the resonant module used for heating in the electromagnetic heating device and the cookware to be identified is small. Therefore, it determines the cookware as a low-coupling-inductance cookware.

[0066] It should be noted that the embodiments of the present invention do not impose specific restrictions on the second preset threshold corresponding to the slope of the forward current rise. Typically, the second preset threshold K can be preset within the range of [2.92, 3.32]. REF For example, the second preset threshold can be preset to 3.12.

[0067] In this embodiment, the type of cookware is determined by comparing the detected target current parameter with the corresponding preset threshold. This allows the electromagnetic heating device to make corresponding adjustments based on the characteristics of the type of cookware during the heating process. For example, when the cookware is determined to be a low-coupling-resistance type, considering its low coupling resistance and high reverse current, the heating process should be controlled to avoid overheating damage or failure of the switching module due to the large reverse current, thereby ensuring the safety of the electromagnetic heating device in heating the cookware.

[0068] It should be noted that the types of target current parameters detected in this embodiment of the invention are not limited to one. In other words, the electromagnetic heating device can determine the type of cookware to be identified based on the comparison results obtained by comparing multiple detected target current parameters with their respective preset thresholds.

[0069] For example, with the first preset threshold as I REF The second preset threshold is K. REF For example:

[0070] When the detected target current parameters are the reverse current value I and the forward current rise slope K, and the comparison result is I... REF And K <K REF In this case, it can be said that the coupling resistance between the resonant module used for heating in the electromagnetic heating device and the cookware to be identified is large, and the coupling inductance is also large. Therefore, it can be determined that the cookware is a high coupling inductance and high coupling resistance type cookware, that is, a high inductance and high resistance type cookware.

[0071] When the comparison result is I≥I REF And K <K REF In this case, it can be said that the coupling resistance between the resonant module used for heating in the electromagnetic heating device and the cookware to be identified is small and the coupling inductance is large, thus it can be determined that the cookware is a high coupling inductance and low coupling resistance type cookware, that is, a high inductance and low resistance type cookware.

[0072] The comparison result is I. REF And K≥K REF In this case, it can be explained that the coupling resistance between the resonant module used for heating in the electromagnetic heating device and the cookware to be identified is large and the coupling inductance is small, thus it can be determined that the cookware is a low coupling inductance and high coupling resistance type cookware, that is, a low inductance and high resistance type cookware.

[0073] When the comparison result is I≥I REF And K≥K REF In this case, it can be said that the coupling resistance between the resonant module used for heating in the electromagnetic heating device and the cookware to be identified is small, and the coupling inductance is also small. Therefore, it can be determined that the cookware is a low-coupling-inductance, low-coupling-resistance type cookware, that is, a low-inductance, low-resistance type cookware.​​

[0074] It is understood that, since the types of target current parameters detected in this embodiment of the invention are not limited to reverse current value and forward current slope, but can also be other parameters, this embodiment does not make specific limitations. The more types of target current parameters there are, the more types of cookware can be identified.

[0075] It should be noted that during the cookware identification process, to avoid the influence of other unexpected factors on the identification results, the same cookware can be identified multiple times, and the number of identification attempts can be preset to improve the accuracy and stability of cookware identification. For example, if the preset number of consecutive identification results is three, it means that only if the same identification result is obtained three times consecutively for the cookware will it be finally identified as that type of cookware.

[0076] The following example illustrates the cookware identification method of this invention.

[0077] Figure 2 This is a flowchart illustrating a cookware identification method in an application example of an embodiment of the present invention; as shown below. Figure 2 As shown, given the preset target operating power, target voltage range, first preset threshold, and second preset threshold, the specific process for cookware identification based on the detected reverse current value and forward current rise slope is as follows:

[0078] Step 201: Determine whether the input voltage of the electromagnetic heating device is within the target voltage range and whether it heats the pot to be identified according to the target working power.

[0079] Specifically, based on the preset target operating power and target voltage range, assuming the target operating power is 1700W and the target voltage range is [198V, 242V], it determines whether the operating power P during the current heating process is 1700W and whether the current input voltage V is within the range of [198V, 242V]. If the current target operating power and target voltage range are met, the target current parameter detection continues; otherwise, the cookware identification ends directly.

[0080] Step 202: If it is determined that the heating process of the electromagnetic heating device for the pot to be identified meets the target voltage range and target working efficiency, determine whether the inversion signal B is obtained.

[0081] Specifically, during the heating process of the electromagnetic heating device on the cookware to be identified, the reverse current value is detected in real time, and if the currently detected reverse current value I ≥ I REF In such cases, a reversal signal will be generated to indicate that the coupling resistance between the cookware and the electromagnetic heating device is too low.

[0082] It should be noted that the embodiments of the present invention do not impose specific limitations on the method for determining whether an inverted signal has been acquired; for example, it can be represented in binary form. Specifically, when B = 0, it can indicate that an inverted signal has been acquired; when B = 1, it can indicate that an inverted signal has not been acquired.

[0083] Step 203: If it is determined that no reversal signal is currently obtained, the detected forward current rise slope is compared with the corresponding second preset threshold to obtain the comparison result.

[0084] Specifically, when it is determined that no inversion signal has been obtained, i.e., I REF In the case of a positive current rise slope K, compare whether the detected positive current rise slope K is less than K. REF The comparison results were obtained.

[0085] Step 204a: The comparison result in step 203 is K. <K REF In the case of [a specific situation], add one more time to determine if the cookware is a high-sensitivity, high-resistance cookware.

[0086] Step 204b: The comparison result in step 203 is K≥K REF In such cases, add one more time to determine if the cookware is a low-sensitivity, high-resistance type cookware.

[0087] Step 205: Determine if the number of recognition attempts has reached three. If it has, proceed to step 206 (step 206a, step 206b). If it has not reached three, continue to execute step 203.

[0088] Step 206a: If the number of recognitions in step 205 reaches three, then the cookware is determined to be a low-sensitivity, high-resistance cookware.

[0089] Step 206b: If the number of recognitions in step 205 reaches three, then the cookware is determined to be a high-sensitivity, high-resistance cookware.

[0090] Step 207: If a reversal signal is obtained, compare whether the detected forward current rise slope K is less than K. REF The comparison results were obtained.

[0091] Specifically, after determining that a reversal signal has been obtained, i.e., I≥I REF In the case of a positive current rise slope K, compare whether the detected positive current rise slope K is less than K. REF The comparison results were obtained.

[0092] Step 208a: When the comparison result is K <K REF In the case of [a specific situation], add one more time to determine if the cookware is a high-sensitivity, low-resistance cookware.

[0093] ​Step 208b: When the comparison result is K≥K REF In the case of [a specific type of cookware], add one more time to determine if the cookware is a low-inductance, low-resistance cookware.

[0094] Step 209: Determine if the number of recognition attempts has reached three. If it has, proceed to step 210 (step 210a, step 210b); then continue to re-execute step 207.

[0095] Step 210a: If the number of recognitions in step 209 reaches three, then the cookware is determined to be a low-inductance, low-resistance cookware.

[0096] Step 210b: If the number of recognitions in step 209 reaches three, then the cookware is determined to be a high-sensitivity, low-resistance cookware.

[0097] In this embodiment, the electromagnetic heating device detects a target current parameter associated with a switching module. The switching module is connected to a resonant module in the electromagnetic heating device. The switching module controls the resonant module to oscillate by turning on or off to heat the cookware. A comparison result is obtained by comparing the target current parameter associated with the switching module with the corresponding preset threshold. Based on the comparison result, the cookware type is identified, making the electromagnetic heating device's identification of cookware type more precise and improving the accuracy of cookware identification.

[0098] In order to implement the method of the present invention, the present invention also provides a cookware identification device, which corresponds to the cookware identification method described above. The steps in the embodiments of the cookware identification method described above are also fully applicable to the embodiments of the cookware identification device.

[0099] Figure 3 This is a schematic diagram of the cookware recognition device according to an embodiment of the present invention; as shown. Figure 3 As shown, the cookware identification device includes:

[0100] Resonant module 301;

[0101] A switching module 302 connected to the resonant module 301 is used to control the resonant module 301 to oscillate in order to heat the cookware when the switching module 302 is turned on or off.

[0102] The detection and control module 303, which is connected to the switch module 302, is used to detect the target current parameter; compare the target current parameter with a preset threshold, and determine the cookware type based on the comparison result.

[0103] In this embodiment, the resonant module 301 is electrically connected to the switch module 302 and is used to generate oscillations through the on and off states of the switch module 302 to heat the cookware to be identified.

[0104] For example, such as Figure 4 As shown, Figure 4 A schematic diagram of the protection circuit of the cookware identification device according to an embodiment of the present invention is shown. When the switching module 302 is an IGBT module, the resonant module 301 is connected to the collector (C) of the IGBT module. The resonant module 301 can be composed of an inductor L1 and a second capacitor C2 connected in parallel. The inductor L1 can also be called a resonant coil, specifically a coil disk with a magnetic strip at the bottom; the second capacitor C2 can also be called a resonant capacitor. The resonant module 301, composed of the inductor L1 and the second capacitor C2 connected in parallel, oscillates through the high-frequency switching of the IGBT module, converting electrical energy into magnetic energy to generate eddy currents, thereby heating the cookware.

[0105] The detection and control module 303 is connected to the gate (G) of the IGBT module, which serves as the switching module 302 (e.g., Figure 4 As shown in the figure, it is used to detect the target current parameter, compare the detected target current parameter with the preset threshold, and identify the type of cookware based on the comparison result.

[0106] In some embodiments, the target current parameter includes at least one of the following: reverse current value, forward current rise slope; the detection control module 303 includes a current detection unit 3031 and a control unit 3032; wherein, the current detection unit 3031 is used to detect the reverse current value, compare the reverse current value with a first preset threshold, and send a reversal signal to the control unit 3032 if the comparison result is that the reverse current value is greater than or equal to the first preset threshold; and / or, is used to collect forward current; the control unit 3032 is used to determine the cookware type according to whether the reversal signal is received, and / or, is used to calculate the forward current rise slope based on the forward current collected by the current detection unit 3031, compare the forward current rise slope with a second preset threshold, and determine the cookware type according to the comparison result.

[0107] In this embodiment of the invention, the detection and control module 303 may consist of a current detection unit 3031 and a control unit 3032.

[0108] The current detection unit 3031 is used to detect current and may include an AD module and one or more comparators. The AD module, also known as an AD acquisition unit, is used to acquire forward current and transmit the acquired forward current to the control unit 3032 to calculate the forward current rise slope. The control unit 3032 compares the obtained forward current slope with a corresponding second preset threshold to obtain a comparison result. The comparator is used to compare the detected reverse current value with a corresponding first preset threshold. If the comparison result shows that the reverse current value is greater than or equal to the first preset threshold, a reversal signal is sent to the control unit 3032 so that the control unit 3032 can determine that the cookware is a low-coupling-resistance type cookware based on the received reversal signal. Conversely, if the control unit 3032 does not receive a reversal signal, it can determine that the cookware is a high-coupling-resistance type cookware.

[0109] For example, such as Figure 4 As shown, the detection and control module 303 can be composed of a current detection unit 3031 and a control unit 3032 connected in series. One end of the current detection unit 3031 is electrically connected to the voltage divider resistor R1, and the other end is electrically connected to the control unit 3032. One end of the control unit 3032 is electrically connected to the current detection unit 3031, and the other end is electrically connected to the gate (G) terminal of the IGBT module.

[0110] It should be noted that the control unit in the detection control module can be a central processing unit (CPU), a digital signal processor (DSP), a microcontroller unit (MCU), or a field-programmable gate array (FPGA), etc. Figure 4 The following explanation uses an MCU as an example of a control component.

[0111] In some embodiments, the control unit 3032 is configured to determine the cookware type according to at least one of the following: determining the cookware as a high-coupling-resistance type when the inversion signal is not received; determining the cookware as a low-coupling-resistance type when the inversion signal is received; determining the cookware as a high-coupling-inductance type when the comparison result is that the forward current rise slope is less than the second preset threshold; and determining the cookware as a low-coupling-inductance type when the comparison result is that the forward current rise slope is greater than or equal to the second preset threshold.

[0112] In some embodiments, the current detection unit 3031 is used to detect the reverse voltage value of the switching module 302, determine the reverse current value based on the reverse voltage value, and / or acquire the forward current through the AD module.

[0113] In some embodiments, the control unit 3032 is further configured to acquire the target operating power and target voltage range of the electromagnetic heating device; and to enable the current detection unit 3031 when the input voltage of the electromagnetic heating device is within the target voltage range and the cookware is heated according to the target operating power.

[0114] In some embodiments, the switching module 302 is an IGBT module, the input terminal of the current detection unit 3031 is connected to the emitter of the IGBT module, and the output terminal of the current detection unit 3031 is connected to the control unit 3032; the emitter of the IGBT module is grounded through a voltage divider resistor.

[0115] For example, such as Figure 4 As shown, the IGBT module, which serves as the switching module 302, has its collector (C) terminal electrically connected to the resonant module 301, its emitter (E) terminal electrically connected to one end of the voltage divider resistor R1, the other end of the voltage divider resistor R1 grounded, and its gate (G) terminal electrically connected to the control unit 3032 in the detection and control module 303.

[0116] In some embodiments, the cookware identification device further includes a rectifier module for converting the input AC power into DC power.

[0117] For example, such as Figure 4 As shown, the first capacitor C1 is connected in parallel with the rectifier module to filter the pulsating DC power after conversion by the rectifier module to obtain smooth DC power; wherein, the first capacitor C1 should be a low-frequency filter capacitor.

[0118] It should be noted that the cookware recognition device provided in the above embodiments is only illustrated by the division of the above-described program modules. In practical applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the processing described above. In addition, the cookware recognition device and the cookware recognition method embodiments provided in the above embodiments belong to the same concept, and their specific implementation process can be found in the method embodiments, which will not be repeated here.

[0119] based on Figure 3The schematic diagram of the cookware identification device shown illustrates that, in order to implement the method of this embodiment, this invention also provides an electromagnetic heating device. The electromagnetic heating device includes at least one processor and a user interface. The various components in the electromagnetic heating device are coupled together via a bus system. It can be understood that the bus system is used to realize the connection and communication between these components. In addition to a data bus, the bus system also includes a power bus, a control bus, and a status signal bus.

[0120] The user interface may include buttons, keypads, touchpads, or touchscreens.

[0121] The cookware identification method disclosed in this invention can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the cookware identification method can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The aforementioned processor can be a general-purpose processor, a digital signal processor, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor can implement or execute the methods, steps, and logic block diagrams disclosed in this invention's embodiments. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention's embodiments can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor.

[0122] In an exemplary embodiment, the electromagnetic heating device may be implemented by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays, general-purpose processors, controllers, microcontrollers, microprocessors, or other electronic components to perform the aforementioned method.

[0123] In an exemplary embodiment, the present invention also provides a storage medium, namely a computer storage medium, specifically a computer-readable storage medium, such as a memory including a computer program. This computer program can be executed by the processor of the cookware recognition device to complete the steps described in the method of the present invention. The computer-readable storage medium can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM), etc.

[0124] In an exemplary embodiment, the present invention also provides a computer program product, including a computer program that can be executed by the processor of a cookware recognition device to perform the steps described in the method of the present invention.

[0125] The methods disclosed in the several method embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments.

[0126] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0127] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0128] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.

[0129] In addition, in the various embodiments of the present invention, each functional unit can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0130] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for identifying cookware, characterized in that, The method is applied to an electromagnetic heating device, and the method includes: Detect target current parameters associated with the switching module; wherein the switching module is connected to the resonant module of the electromagnetic heating device, and the switching module’s on or off state is used to control the resonant module to oscillate in order to heat the cookware; The target current parameter is compared with a preset threshold, and the cookware type is determined based on the comparison result.

2. The method according to claim 1, characterized in that, The target current parameter includes at least one of the following: reverse current value, forward current rise slope; The step of comparing the target current parameter with a preset threshold and determining the cookware type based on the comparison result includes at least one of the following: The reverse current value is compared with a first preset threshold. If the comparison result shows that the reverse current value is less than the first preset threshold, the cookware is determined to be a high-coupling-resistance cookware. If the comparison result shows that the reverse current value is greater than or equal to the first preset threshold, the cookware is determined to be a low-coupling-resistance cookware. The cookware is determined to be a high-coupling inductance cookware if the slope of the forward current rise is less than the second preset threshold, and if the slope of the forward current rise is greater than or equal to the second preset threshold.

3. The method according to claim 1, characterized in that, The target current parameter includes at least one of the following: reverse current value, forward current rise slope; The detection of the target current parameter associated with the switching module includes: Detect the reverse voltage value of the switching module, and determine the reverse current value based on the reverse voltage value; and / or, The forward current is acquired by an AD module, and the upward slope of the forward current is calculated based on the acquired forward current.

4. The method according to claim 1, characterized in that, The method further includes: obtaining the target operating power and target voltage range of the electromagnetic heating device; Accordingly, the detection of the target current parameter associated with the switching module includes: When the input voltage of the electromagnetic heating device is detected to be within the target voltage range and the cookware is heated according to the target operating power, the target current parameter associated with the switching module is detected.

5. The method according to claim 1, characterized in that, The switching module is an Insulated Gate Bipolar Transistor (IGBT) module.

6. A cookware identification device, characterized in that, The device includes: Resonant module; A switching module connected to the resonant module, wherein the switching module is turned on or off to control the oscillation of the resonant module to heat the cookware; The detection and control module connected to the switch module is used to detect the target current parameter; compare the target current parameter with a preset threshold, and determine the cookware type based on the comparison result.

7. The apparatus according to claim 6, characterized in that, The target current parameter includes at least one of the following: reverse current value, forward current rise slope; The detection and control module includes a current detection unit and a control unit; wherein... The current detection unit is used to detect the reverse current value, compare the reverse current value with a first preset threshold, and send a reversal signal to the control unit when the comparison result is that the reverse current value is greater than or equal to the first preset threshold; and / or, to collect the forward current. The control unit is configured to determine the cookware type based on whether the reverse signal is received, and / or to calculate the forward current rise slope based on the forward current collected by the current detection unit, compare the forward current rise slope with a second preset threshold, and determine the cookware type based on the comparison result.

8. The apparatus according to claim 7, characterized in that, The control unit is configured to determine the cookware type according to at least one of the following: If the inversion signal is not received, the cookware is determined to be of high coupling resistance type; if the inversion signal is received, the cookware is determined to be of low coupling resistance type. If the comparison result shows that the slope of the positive current rise is less than the second preset threshold, the cookware is determined to be a high-coupling inductance cookware. If the comparison result shows that the upward slope of the forward current is greater than or equal to the second preset threshold, the cookware is determined to be a low-coupling inductance cookware.

9. The apparatus according to claim 7, characterized in that, The current detection unit is used to detect the reverse voltage value of the switching module, determine the reverse current value based on the reverse voltage value, and / or acquire the forward current through the AD module.

10. The apparatus according to claim 7, characterized in that, The control unit is also configured to acquire the target operating power and target voltage range of the electromagnetic heating device; and to enable the current detection unit when the input voltage of the electromagnetic heating device is within the target voltage range and the cookware is heated according to the target operating power.

11. The apparatus according to claim 7, characterized in that, The switching module is an IGBT module, the input terminal of the current detection unit is connected to the emitter of the IGBT module, and the output terminal of the current detection unit is connected to the control unit. The emitter of the IGBT module is grounded through a voltage divider resistor.

12. An electromagnetic heating device, characterized in that, The electromagnetic heating device includes the cookware identification device as described in any one of claims 6 to 11.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method according to any one of claims 1 to 5.

14. A computer program product, characterized in that, It includes computer program instructions that cause a computer to perform the steps of the method according to any one of claims 1 to 5.

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