Cookware temperature detection component and cooking device

Abstract

The present application discloses a pot temperature detection component and a cooking device. The pot temperature detection component is used to detect the pot temperature when a heating coil is heating the pot. The pot temperature detection component includes: a sampling coil, a signal conversion circuit, and a processing circuit. The sampling coil is set corresponding to the heating coil; the excitation period of the excitation source of the heating coil within a preset window centered on the zero-crossing point meets the set requirements; the signal conversion circuit is connected to the sampling coil and is used to convert the resonant signal sampled by the sampling coil into a square wave signal; the processing circuit is connected to the signal conversion circuit and is used to process the square wave signal to determine the temperature change of the pot. Through the above method, the present application can send an excitation signal to the zero-crossing window, and process the resonant signal through the signal conversion circuit and the processing circuit to obtain the temperature change of the pot. The circuit structure is simple, the temperature detection is sensitive, and it is easy to implement.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic heating technology, and in particular to a pot temperature detection component and a cooking device. Background Art

[0002] Electromagnetic induction heating, also known as induction heating, utilizes magnetic flux lines generated by a coil to cut through the cookware, generating eddy currents within the material being heated. The Joule heating effect of these eddy currents heats the cookware, achieving the desired effect. Due to its flame-free, environmentally friendly, safe, and energy-efficient properties, electromagnetic induction heating is gaining increasing popularity among consumers and has become a frequently used cooking device.

[0003] In electromagnetic heating cooking technology, in order to pursue highly intelligent cooking, it is generally chosen to measure the temperature of the pot, so as to control and adjust the cooking mode according to the temperature changes of the pot. For example, when it is detected that the temperature of the pot has dropped, the heating power can be automatically increased to speed up cooking efficiency.

[0004] Generally speaking, most pot temperature measurement systems use an NTC thermistor on a coil disk through a ceramic panel to measure the pot's temperature indirectly. This indirect measurement method is subject to issues such as inaccuracy and lag. If the pot's temperature suddenly cools down, the induction cooker won't be able to detect it in time and may continue to heat it at low power, resulting in low cooking efficiency. Summary of the Invention

[0005] The present application mainly provides a resonant control circuit and a cooking device, which can solve the problem in the prior art that the resonant circuit is easily interfered with when supplying DC voltage to the resonant circuit.

[0006] To solve the above technical problems, the first aspect of the present application provides a pot temperature detection component, which is used to detect the pot temperature in a scenario where a heating coil heats the pot. The pot temperature detection component includes: a sampling coil, which is arranged corresponding to the heating coil; wherein the excitation period of the excitation source of the heating coil meets the set requirements within a preset window centered on the zero crossing point; a signal conversion circuit, connected to the sampling coil, for converting the resonant signal sampled by the sampling coil into a square wave signal; and a processing circuit, connected to the signal conversion circuit, for processing the square wave signal to determine the temperature change of the pot.

[0007] Optionally, the heating coil is configured as a wire coil, and the sampling coil is disposed at the center of the wire coil.

[0008] Optionally, the sampling coil is sleeved on the lead wire of the heating coil.

[0009] Optionally, the signal conversion circuit includes: a first capacitor, a first end of the first capacitor is connected to the sampling coil; a first comparator, an inverting end of the first comparator is connected to the second end of the first capacitor, and a non-inverting end of the first comparator is grounded; a first resistor, a first end of the first resistor is connected to the inverting end of the first comparator, and a second end of the first resistor is connected to the output end of the first comparator; a second comparator, an inverting end of the second comparator is connected to the output end of the first comparator, a non-inverting end of the second comparator is grounded, and the output end of the second comparator outputs the square wave signal.

[0010] Optionally, the signal conversion circuit further includes: a first diode, wherein an anode of the first diode is connected to the first end of the first capacitor, and a cathode of the first diode is input with a reference voltage.

[0011] Optionally, the signal conversion circuit further includes: a second resistor, a first end of the second resistor being connected to the sampling coil, and a second end of the second resistor being connected to the first end of the first capacitor; a second capacitor, a first end of the second capacitor being connected to the inverting end of the first comparator, and a second end of the second capacitor being connected to the output end of the first comparator; and a third resistor, a first end of the third resistor being connected to the output end of the first comparator, and a second end of the third resistor being connected to the inverting end of the second comparator.

[0012] Optionally, the processing circuit is used to: receive square wave signals of preset windows corresponding to at least three zero-crossing points; obtain the pulse period or pulse frequency change trend of the resonance signal based on the square wave signals; and determine the temperature change of the cookware based on the pulse period or pulse frequency change trend of the resonance signal.

[0013] Optionally, the processing circuit is specifically configured to calculate a pulse period or a pulse frequency of the resonance signal according to a width of the square wave signal and the number of square waves.

[0014] Optionally, the processing circuit is specifically used to determine that the temperature of the cookware has dropped when the pulse period of the resonance signal shows a downward trend and the decline is greater than a first preset threshold, or the pulse frequency of the resonance signal shows an upward trend and the increase is greater than a second preset threshold.

[0015] In order to solve the above technical problems, the second aspect of the present application provides a cooking device, which includes the pot temperature detection component provided in the first aspect.

[0016] The beneficial effects of the present application are as follows: Different from the prior art, the pot temperature detection component of the present application is used to detect the pot temperature in a scenario where the pot is heated by a heating coil. The pot temperature detection component specifically includes: a sampling coil, a signal conversion circuit, and a processing circuit. The sampling coil is set corresponding to the heating coil. The excitation source of the heating coil meets the set requirements for the excitation period within a preset window centered on the zero crossing point, so that the resonant circuit including the heating coil can resonate freely. The sampling coil can collect a free resonance signal. The free resonance signal carries the temperature information of the pot. The signal conversion circuit is connected to the sampling coil and is used to convert the resonant signal sampled by the sampling coil into a square wave signal. The processing circuit is connected to the signal conversion circuit and is used to process the square wave signal to obtain the temperature change of the pot. Using the above method, the present application can obtain the resonant signal containing the pot temperature change information and analyze and process it to obtain the temperature change of the pot. The circuit structure is simple, the temperature detection is sensitive, and it is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0018] Figure 1 This is a schematic diagram of a heating circuit according to an embodiment of electromagnetic heating of the present application;

[0019] Figure 2 This is a circuit diagram of an embodiment of a cookware temperature detection component of the present application;

[0020] Figure 3 It is a schematic diagram of the resonance range of the heating coil of the present application;

[0021] Figure 4 This is a structural diagram of an embodiment of the arrangement of the sampling coil and the heating coil of the present application;

[0022] Figure 5 This is a circuit diagram of an embodiment of the arrangement of the sampling coil and the heating coil of the present application;

[0023] Figure 6 This is a structural diagram of another embodiment of the arrangement of the sampling coil and the heating coil of the present application;

[0024] Figure 7 This is a circuit diagram of another embodiment of the arrangement of the sampling coil and the heating coil of the present application;

[0025] Figure 8This is a circuit structure diagram of an embodiment of the signal conversion circuit of the present application;

[0026] Figure 9 This is a schematic diagram of an embodiment of the process of signal conversion performed by the signal conversion circuit of the present application;

[0027] Figure 10 This is a schematic diagram of an embodiment of the present application for converting a resonant signal using a signal conversion circuit;

[0028] Figure 11 1 is a circuit structure diagram of another embodiment of the signal conversion circuit of the present application;

[0029] Figure 12 This is a schematic block diagram of a process for performing signal processing by a processing circuit according to an embodiment of the present application;

[0030] Figure 13 This is a schematic diagram of an embodiment of a pulse period variation trend of a resonance signal of the present application;

[0031] Figure 14 This is a structural diagram of an embodiment of a cooking area of ​​the present application;

[0032] Figure 15 It is a structural schematic block diagram of an embodiment of the cooking device of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0034] In the above description of this specification, unless otherwise expressly provided, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to fixed, removable, or integrated connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Therefore, unless otherwise expressly provided in this specification, those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0035] In addition, the terms "first" or "second" and other terms used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood to explicitly or implicitly indicate relative importance or implicitly indicate the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three, or more.

[0036] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

[0037] See also Figure 1 , Figure 1 This is a schematic diagram of the heating circuit of an embodiment of electromagnetic heating in this application. It includes a rectifier bridge UR1, a choke coil L, a filter capacitor C, a resonant capacitor C', a heating coil L1 and a switch tube Q1. The resonant capacitor C' and the heating coil L1 form an LC resonant circuit. For the specific connection method of the other components, please refer to Figure 1 Detailed description is omitted here. The switch Q1 is controlled by the drive circuit to switch on and off at high speed, thereby causing the LC resonant circuit to resonate and achieve electromagnetic heating of the cookware. This embodiment only illustrates one method of electromagnetic heating. In specific applications, it is not limited to the above method and other methods may also be used.

[0038] Electromagnetic heating, also known as electromagnetic induction heating, works by generating an alternating magnetic field through a heating coil L1. When a ferrous container is placed on top of it, the container's surface cuts through the alternating magnetic field lines, generating alternating currents (eddy currents) in the metal portion of the container's bottom. These eddy currents cause carriers in the container's bottom to move at high speeds and irregularly. The collision and friction between the carriers and atoms generates heat energy, thereby heating the object. Because the heat is generated by the iron container itself, the heat conversion rate is extremely high, reaching up to 95%. This is a direct heating method.

[0039] See also Figure 2 , Figure 2 This is a schematic diagram of the circuit structure of an embodiment of a cookware temperature detection assembly of the present application. In this embodiment, when a heating coil is heating a cookware, the cookware temperature detection assembly is used to detect the temperature of the cookware. Specifically, the cookware temperature detection assembly of this embodiment includes: a sampling coil L2, a signal conversion circuit 20, and a processing circuit 30.

[0040] The sampling coil L2 is configured to correspond to the heating coil L1, and the excitation source of the heating coil L1 meets the set excitation period within a preset window centered on the zero crossing point. A signal conversion circuit 20 is connected to the sampling coil L2 and is used to convert the resonant signal sampled by the sampling coil L2 into a square wave signal. A processing circuit 30 is connected to the signal conversion circuit 20 and is used to process the square wave signal to determine the temperature change of the pot. This facilitates timely adjustment of the heating power when a drop in pot temperature is detected, contributing to the implementation of intelligent cooking mode adjustment.

[0041] Among them, the excitation source can emit a pulse modulation signal according to a set excitation period within a preset window centered on the zero-crossing point (i.e., the zero-crossing window, the voltage range of which is 10 to 50 V). Under the control of the pulse modulation signal, the sampling coil L2 can obtain the free resonance signal of the zero-crossing window, and use the signal conversion circuit 20 and the processing circuit 30 to jointly analyze the resonance signal, so as to detect the temperature change of the cookware.

[0042] Optionally, the duration of sending the pulse modulation signal may be 50 μs to 100 μs.

[0043] Optionally, the duration of the preset window centered at the zero-crossing point is greater than 100 μs.

[0044] Specifically, the change in the temperature of the pot will cause the inductance Ls and impedance Rs of the heating coil L1 to change, and the change in the inductance Ls and impedance Rs of the heating coil L1 can be reflected by the change in its free oscillation period or frequency. Figure 3 , Figure 3 This is a schematic diagram of the resonance range of the heating coil of the present application, where intervals A1...An are zero-crossing windows. In this embodiment, the excitation source can be controlled to emit a PPG01 pulse modulation signal in the zero-crossing window with a fixed excitation period, so that the LC resonant circuit can oscillate freely in the zero-crossing window. After the sampling coil L2 samples the resonant signal (pulses V1, V11, V12, V13, V14...) of the free oscillation process, the signal conversion circuit 20 and the processing circuit 30 are used to perform signal analysis, and the pulse period or frequency of the free oscillation can be obtained. The change trend of the pulse period or frequency can be obtained through the resonant signals of multiple zero-crossing windows, and the temperature change of the pot can be analyzed based on the change trend of the pulse period or frequency.

[0045] Optionally, the signal conversion circuit 20 of this embodiment collects the freely oscillating resonant signals of three or more zero-crossing windows and converts them into square wave signals. The processing circuit 30 processes the square wave signals corresponding to three or more zero-crossing windows to obtain the pulse period or pulse frequency of the resonant signal corresponding to each zero-crossing window, and obtains the temperature change of the pot according to the change trend of the pulse period or pulse frequency of the resonant signal corresponding to three or more zero-crossing windows.

[0046] The three or more zero-crossing windows may be continuous or may be separated by one or two zero-crossing windows.

[0047] Optionally, the excitation source sends a PPG01 pulse modulation signal at the starting position of the zero-crossing window.

[0048] Different from the prior art, this embodiment can obtain the resonance signal during the free oscillation period and perform pulse period or pulse frequency analysis on the resonance signal during this period to detect the change in the temperature of the cookware.

[0049] Please refer to Figure 4 and Figure 5 , Figure 4 This is a structural diagram of an embodiment of the arrangement of the sampling coil and the heating coil of this application. Figure 5 The circuit structure diagram of an embodiment of the arrangement of the sampling coil and the heating coil of the present application is shown in FIG. In this embodiment, the sampling coil L2 is arranged at the center of the heating coil L1 to collect the resonant signal of the heating coil L1 at the zero-crossing window.

[0050] Please refer to Figure 6 and Figure 7 , Figure 6 This is a structural diagram of another embodiment of the arrangement of the sampling coil and the heating coil of this application. Figure 7 This is a circuit diagram of another embodiment of the arrangement of the sampling coil and the heating coil of the present application.

[0051] The sampling coil L2 of this embodiment is a current transformer. The sampling coil L2 is sleeved on the lead wire of the heating coil L1 to collect the resonant signal of the heating coil L1 at the zero-crossing window.

[0052] In addition to the above two configurations, the sampling coil L2 may be configured relative to the heating coil L1 in other ways.

[0053] See also Figure 8 , Figure 8 FIG2 is a circuit diagram of an embodiment of a signal conversion circuit of the present application. The signal conversion circuit 20 may include a first capacitor C1, a first comparator U1A, a first resistor R1, and a second comparator U1B.

[0054] The first end of the first capacitor C1 is connected to the sampling coil L2 , the inverting end of the first comparator U1A is connected to the second end of the first capacitor C1 , and the non-inverting end of the first comparator U1A is grounded.

[0055] A first end of the first resistor R1 is connected to an inverting end of the first comparator U1A, and a second end of the first resistor R1 is connected to an output end of the first comparator U1A.

[0056] An inverting terminal of the second comparator U1B is connected to the output terminal of the first comparator U1A, a non-inverting terminal of the second comparator U1B is grounded, and an output terminal of the second comparator U1B outputs a square wave signal.

[0057] See also Figure 9 , Figure 9 This is a schematic diagram of an embodiment of the signal conversion process of the signal conversion circuit of the present application. Waveform (a) is the AC waveform input to the signal conversion circuit 20, waveform (b) is the waveform output from the output end of the first comparator U1A, and waveform (c) is the waveform output from the output end of the second comparator U1B. Waveform (c) is a square wave signal.

[0058] See also Figure 10 , Figure 10 This is a schematic diagram of an embodiment of the present application using a signal conversion circuit to convert a resonant signal. After processing by the signal conversion circuit 20, a square wave signal corresponding to the resonant signal pulse can be obtained. The pulse period or frequency of the resonant signal can be calculated using the width ΔT of the square wave signal and the number of square waves.

[0059] See also Figure 11 , Figure 11 FIG2 is a circuit diagram of another embodiment of the signal conversion circuit of the present application. The signal conversion circuit 20 may include a first capacitor C1, a first comparator U1A, a first resistor R1, and a second comparator U1B.

[0060] Among them, the first end of the first capacitor C1 is connected to the sampling coil L2, the inverting end of the first comparator U1A is connected to the second end of the first capacitor C1, and the non-inverting end of the first comparator U1A is grounded; the first end of the first resistor R1 and the inverting end of the first comparator U1A are mutually connected, and the second end of the first resistor R1 is connected to the output end of the first comparator U1A; the inverting end of the second comparator U1B is connected to the output end of the first comparator U1A, the non-inverting end of the second comparator U1B is grounded, and the output end of the second comparator U1B outputs a square wave signal.

[0061] Optionally, the signal conversion circuit 20 further includes a first diode D1, the anode of the first diode D1 is connected to the first end of the first capacitor C1, and the cathode of the first diode D1 is input with the reference voltage VCC to play a clamping role, limiting the potential here to a specified potential.

[0062] Optionally, the signal conversion circuit 20 further includes a second resistor R2, a second capacitor C2, and a third resistor R3. The first end of the second resistor R2 is connected to the sampling coil L2, and the second end of the second resistor R2 is connected to the first end of the first capacitor C1, to perform filtering and current limiting functions; the first end of the second capacitor C2 is connected to the inverting terminal of the first comparator U1A, and the second end of the second capacitor C2 is connected to the output terminal of the first comparator U1A, to perform filtering functions; the first end of the third resistor R3 is connected to the output terminal of the first comparator U1A, and the second end of the third resistor R3 is connected to the inverting terminal of the second comparator U1B, and the third resistor R3 performs current limiting functions.

[0063] Optionally, the signal conversion circuit 20 further includes a fourth resistor R4 and a fifth resistor R5. The fourth resistor R4 is connected to the non-inverting terminal of the first comparator U1A, and the fifth resistor R5 is connected to the non-inverting terminal of the second comparator U1B. The fourth resistor R4 and the fifth resistor R5 both play a filtering role.

[0064] The resistance range of the first resistor R1 , the second resistor R2 , the third resistor R3 , the fourth resistor R4 and the fifth resistor R5 is 10-100KΩ, and the capacitance range of the first capacitor C1 and the second capacitor C2 is 10PF-10uf.

[0065] See also Figure 12 , Figure 12 This is a schematic block diagram of a process flow of an embodiment of signal processing performed by the processing circuit of the present application. This embodiment includes the following steps:

[0066] S10, receiving square wave signals in a preset window corresponding to at least three zero-crossing points.

[0067] In this embodiment, the square wave signals of the preset windows (ie the aforementioned zero-crossing windows) corresponding to at least three zero-crossing points are used to reflect the temperature of the cookware at that location through the pulse period or pulse frequency of each window.

[0068] Optionally, the preset windows corresponding to the at least three zero-crossing points may be continuous, or may be separated by one or two zero-crossing windows. Preferably, the preset windows corresponding to the at least three zero-crossing points are continuous, which can more quickly and sensitively detect the temperature change of the cookware.

[0069] S20 , obtaining a pulse period or a pulse frequency variation trend of the resonance signal according to the square wave signal.

[0070] The signal conversion circuit 20 converts the resonance signal of the preset window corresponding to each zero-crossing point into a square wave signal. The converted square wave signal is as follows: Figure 9 As shown, it can be based on Figure 9 The square wave signal is used to obtain the pulse frequency or pulse period of the corresponding resonant signal.

[0071] The pulse period is the time interval between two adjacent pulses in a periodically repeated pulse sequence, and the pulse frequency is the number of effective discharges occurring on the discharge gap per unit time.

[0072] Specifically, this step can calculate the pulse period or frequency of the resonant signal based on the width of the square wave signal and the number of square waves. Among them, pulse period = pulse width ΔT / number of square waves, pulse frequency = 1 / pulse period. Through the above calculation method, the pulse period or frequency of the resonant signal in the preset window corresponding to each zero-crossing point can be calculated. By calculating the pulse period or pulse frequency of at least three zero-crossing windows, the changing trend of the pulse period or pulse frequency can be obtained.

[0073] S30, determining the temperature change of the cookware according to the pulse period or pulse frequency change trend of the resonance signal.

[0074] Optionally, when the pulse period of the resonance signal shows a downward trend and the decrease amplitude is greater than a first preset threshold, or the pulse frequency of the resonance signal shows an upward trend and the increase amplitude is greater than a second preset threshold, it is determined that the temperature of the cookware has dropped.

[0075] See also Figure 13 , Figure 13 This is a schematic diagram of an embodiment of the pulse period variation trend of the resonance signal of the present application. In this embodiment, the preset windows corresponding to the five zero-crossing points are obtained (in terms of time sequence, they are represented by T n-4 、T n-3 、T n-2 、T n-1 、T n ) and calculate the pulse period of the resonance signal corresponding to each zero-crossing window, and then obtain the change curve of the pulse period, such as Figure 13 As shown, there are four situations in which the changing trends of the pulse period are shown by curve A, curve B, curve C, and curve E. Among them, curve D can represent the curve expression of the first preset threshold value. The pulse period trend of curve E is a downward trend and its downward trend is greater than the first preset threshold value, indicating that the temperature of the pot has dropped. The processing circuit can be connected to the control circuit. When the pot temperature drops, the control circuit can control to increase the heating power so that the pot temperature can recover quickly and shorten the heating time.

[0076] Curve B represents the pan moving from the center of the cooking area to the outside, and curve C represents the pan moving from the outside of the cooking area to the center. Figure 14 Since the heating coil L1 heats the pot through the heating panel 40, the area 50 facing the heating coil L1 is the cooking area. In this area, the bottom of the pot is heated by the heating coil L1. If the pot moves, the pulse period will show a changing trend of curve B or curve C.

[0077] Since the pulse period and the pulse frequency can be converted into each other, the changing trend of one of the pulse period and the pulse frequency can be used to reflect the temperature changing trend of the cookware. The changing trend of the pulse period or the pulse frequency can also be converted into other measurement parameters to measure the temperature changing trend of the cookware.

[0078] Optionally, the variation of the pulse period of the two zero-crossing windows can be used to represent the variation of the pulse period. The two zero-crossing windows here can be two consecutive zero-crossing windows or not. Figure 13 The two zero-crossing windows can be represented by T n-4 With T n-3 , after detecting T n-4 to T n-3 The pulse period shows a downward trend, and T n-4 With T n-3 When the pulse period difference is greater than the first preset threshold, it is determined that the temperature of the pot has dropped; the two zero-crossing windows can also be reflected as T n-4 With T n-2 , or T n-4 With T n-1 , or T n-4 With T n In these cases, the judgment of the change of pot temperature is based on the two zero-crossing windows T n-4 With T n-3 The method for determining the temperature change of the cookware is similar and will not be described in detail. Preferably, the two zero-crossing windows are two consecutive zero-crossing windows to avoid reducing the sensitivity of the temperature detection.

[0079] Optionally, the processing circuit 30 may be a CPU (Central Processing Unit), which may be an integrated circuit chip with signal processing capabilities. The processing circuit 30 may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The general-purpose processor may be a microprocessor or any conventional processor.

[0080] Generally speaking, during the cooking process, water or other ingredients are often added to the pot midway through cooking. For example, when stewing soup, different ingredients require different simmering times, so different ingredients are added in batches. Or, when additional water is needed, additional water is added. After adding cold water or ingredients, the temperature of the pot will suddenly drop. If the temperature change of the pot cannot be detected in time and the heat cannot be adjusted, it will take a long time to reheat the pot at the current heat, which is very time-consuming. This embodiment can use the changing trend of the pulse period or pulse frequency at the zero-crossing window to timely reflect the temperature change trend of the pot, making it easier to control the heating of the pot based on the temperature change detection result, thereby saving heating time. The detection result is reliable and highly sensitive.

[0081] See also Figure 15 , Figure 15 This is a schematic block diagram of the structure of one embodiment of a cooking device according to the present application. Cooking device 100 of this embodiment includes a pot temperature detection assembly 101, which can be any of the pot temperature detection assemblies described in any of the aforementioned embodiments. Cooking device 100 of this embodiment can reflect the changing trend of the pot temperature by analyzing the pulse period or pulse frequency trend within the zero-crossing window. This allows for timely detection of a drop in pot temperature, resulting in high sensitivity and reliable detection results.

[0082] In some embodiments, the cooking device 100 also includes a control circuit, and the pot temperature detection component 101 is connected to the control circuit. The control circuit can be used to adjust the heating power. When the pot temperature detection component 101 detects that the pot temperature has dropped, the control circuit controls and adjusts the heating power to realize intelligent temperature sensing and heating regulation of the cooking device 100.

[0083] In some embodiments, cooking device 100 utilizes electromagnetic induction heating, such as an induction cooker. This eliminates the need for open flames or conductive heating, generating heat directly at the bottom of the pot, significantly improving thermal efficiency. An induction cooker is an electrical cooking appliance that utilizes the principle of electromagnetic induction heating. It consists of a high-frequency induction heating coil, a high-frequency power conversion device, a controller, and a ferromagnetic pot base.

[0084] An induction cooker consists of two main parts: one is the electronic circuit system that can generate a high-frequency alternating magnetic field (including the induction cooker coil disk, i.e. the heating coil L1 mentioned above); the other is the structural shell used to fix the electronic circuit system and support the cookware (including the stove panel that can withstand high temperatures and sudden changes in temperature).

[0085] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A cookware temperature detection component, characterized in that: The pot temperature detection component is used to detect the pot temperature when the heating coil heats the pot. The pot temperature detection component includes: A sampling coil is provided corresponding to the heating coil; wherein the excitation period of the excitation source of the heating coil meets the set requirements within a preset window centered at the zero crossing point; wherein the sampling coil is sleeved on the lead wire of the heating coil, or the heating coil is provided as a wire reel, and the sampling coil is provided at the center of the wire reel; a signal conversion circuit, connected to the sampling coil, for converting the resonant signal sampled by the sampling coil into a square wave signal; a processing circuit, connected to the signal conversion circuit, for processing the square wave signal to determine a temperature change of the cookware; The signal conversion circuit includes: a first capacitor, wherein a first end of the first capacitor is connected to the sampling coil; a first comparator, wherein an inverting terminal of the first comparator is connected to the second terminal of the first capacitor, and a non-inverting terminal of the first comparator is grounded; a first resistor, wherein a first end of the first resistor is connected to an inverting end of the first comparator, and a second end of the first resistor is connected to an output end of the first comparator; A second comparator, wherein the inverting terminal of the second comparator is connected to the output terminal of the first comparator, the non-inverting terminal of the second comparator is grounded, and the output terminal of the second comparator outputs the square wave signal.

2. The pot temperature detection assembly according to claim 1, characterized in that: The signal conversion circuit further includes: A first diode, wherein an anode of the first diode is connected to a first end of the first capacitor, and a cathode of the first diode is input with a reference voltage.

3. The cookware temperature detection assembly according to claim 1, characterized in that: The signal conversion circuit further includes: a second resistor, wherein a first end of the second resistor is connected to the sampling coil, and a second end of the second resistor is connected to the first end of the first capacitor; a second capacitor, wherein a first end of the second capacitor is connected to the inverting end of the first comparator, and a second end of the second capacitor is connected to the output end of the first comparator; a third resistor, wherein a first end of the third resistor is connected to the output end of the first comparator, and a second end of the third resistor is connected to the inverting end of the second comparator.

4. The cookware temperature detection assembly according to claim 1, characterized in that: The processing circuit is used for: receiving square wave signals of preset windows corresponding to at least three of the zero-crossing points; Obtaining a pulse period or pulse frequency change trend of the resonance signal according to the square wave signal; The temperature change of the cookware is determined according to the pulse period or pulse frequency change trend of the resonance signal.

5. The cookware temperature detection assembly according to claim 4, characterized in that: The processing circuit is specifically configured to calculate the pulse period or pulse frequency of the resonant signal according to the width of the square wave signal and the number of square waves.

6. The cookware temperature detection assembly according to claim 4, characterized in that: The processing circuit is specifically used to determine that the temperature of the cookware has dropped when the pulse period of the resonance signal shows a downward trend and the decline amplitude is greater than a first preset threshold, or when the pulse frequency of the resonance signal shows an upward trend and the increase amplitude is greater than a second preset threshold.

7. A cooking device, characterized in that: The cooking device comprises the pot temperature detection assembly according to any one of claims 1 to 6.

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