Cookware Detection Method of Electromagnetic Heating Device, Electromagnetic Heating Device, Control Device

Abstract

The present invention provides a method for detecting cookware of an electromagnetic heating device, an electromagnetic heating device, and a control device. The method for detecting cookware includes: sending a single pulse signal to the heating control circuit to cause the resonant circuit to oscillate; obtaining the number of synchronous flips from the synchronous circuit; judging whether there is cookware on the electromagnetic heating device according to the number of synchronous flips; in the case of determining that there is cookware, sending a low-power pulse signal for a first preset time to the heating control circuit; obtaining a sampling parameter value, where the sampling parameter value is used to reflect the position state of the cookware; judging whether the placement position of the cookware is correct according to the sampling parameter value; According to the solution provided by the present invention, it is possible to accurately detect whether the placement position of the cookware is correct, which is beneficial to improving the reliability of the use of the electromagnetic heating device.

Description

Technical Field

[0001] The present invention relates to the field of detection technologies, and in particular to a method for detecting cookware of an electromagnetic heating device, an electromagnetic heating device, and a control device. Background Art

[0002] At present, electromagnetic heating devices are widely used in people's daily lives. For electromagnetic heating devices, special cookware is usually required to be used in combination. In order to ensure normal use, the position state of the cookware generally needs to be detected. The existing detection methods usually use a structural limit groove in combination with a photoelectric switch or a momentary switch for detection. The structural design is relatively complex, the cost is relatively high, and the detection accuracy is relatively low at the same time. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a method for detecting cookware of an electromagnetic heating device, an electromagnetic heating device, and a control device, which can accurately detect whether the placement position of the cookware is correct, and is beneficial to improving the reliability of the use of the electromagnetic heating device.

[0004] In a first aspect, an embodiment of the present invention provides a method for detecting cookware of an electromagnetic heating device. The electromagnetic heating device includes a cookware detection circuit, and the cookware detection circuit includes a power input terminal, a heating control circuit, a resonance circuit, and a synchronization circuit. The heating control circuit is provided with a switching tube. The method for detecting cookware includes:

[0005] Sending a single pulse signal to the heating control circuit to cause the resonance circuit to oscillate;

[0006] Obtaining the number of synchronous flips from the synchronization circuit;

[0007] Judging whether there is cookware on the electromagnetic heating device according to the number of synchronous flips;

[0008] When it is determined that there is cookware, sending a low-power pulse signal with a first preset time to the heating control circuit;

[0009] Obtaining a sampling parameter value, where the sampling parameter value is used to reflect the position state of the cookware;

[0010] Judging whether the placement position of the cookware is correct according to the sampling parameter value.

[0011] The cookware detection method of the electromagnetic heating device provided by the embodiment of the present invention has at least the following beneficial effects: By sending a single pulse signal, obtaining the number of synchronous flips, and making a preliminary judgment based on the number of synchronous flips to determine whether there is cookware on the electromagnetic heating device. When it is determined that there is cookware, a low-power pulse signal is sent to the heating control circuit for the first preset time, and at the same time, the sampling parameter value is obtained. According to the sampling parameter value, the position state of the cookware can be accurately judged. By combining the number of synchronous flips and the sampling parameter value, it is possible to accurately detect whether the placement position of the cookware is correct, which is beneficial to improving the reliability of the use of the electromagnetic heating device.

[0012] In the above cookware detection method, the cookware detection circuit further includes a current detection circuit and a voltage detection circuit. The current detection circuit is arranged between the power input terminal and the resonant circuit. The voltage detection circuit is used to obtain the grid voltage detection value from the power input terminal. The obtaining of the sampling parameter value includes at least one of the following:

[0013] Obtaining the C-pole voltage value of the switching tube and using the C-pole voltage value as the sampling parameter value;

[0014] Obtaining the first resonant frequency from the synchronization circuit and using the first resonant frequency as the sampling parameter value;

[0015] Obtaining the first current value from the current detection circuit, adjusting the first current value according to the grid voltage detection value to obtain a second current value, and using the second current value as the sampling parameter value.

[0016] In the above cookware detection method, the low-power pulse signal is sent multiple times at intervals of a second preset time. The obtaining of the first resonant frequency from the synchronization circuit includes:

[0017] Obtaining the second resonant frequency from the synchronization circuit multiple times;

[0018] Calculating the average value of all the second resonant frequencies to obtain the first resonant frequency.

[0019] In the above cookware detection method, the low-power pulse signal is sent multiple times at intervals of a second preset time. The obtaining of the first current value from the current detection circuit includes:

[0020] Obtaining the third current value from the current detection circuit multiple times;

[0021] Calculating the average value of all the third current values to obtain the first current value.

[0022] In the above cookware detection method, the judging whether there is cookware on the electromagnetic heating device according to the number of synchronous flips includes:

[0023] When the number of synchronous flips is less than the preset number of flips, it is determined that there is a cookware.

[0024] When the number of synchronous flips is greater than or equal to the preset number of flips, it is determined that there is no cookware or the cookware is abnormal.

[0025] In the above cookware detection method, the judging whether the placement position of the cookware is correct according to the sampling parameter value includes:

[0026] When the sampling parameter value is within the preset range, it is determined that the placement position of the cookware is correct;

[0027] When the sampling parameter value is outside the preset range, it is determined that the placement position of the cookware is incorrect.

[0028] In the above cookware detection method, it further includes:

[0029] When it is determined that the placement position of the cookware is correct, control the electromagnetic heating device to start heating;

[0030] When it is determined that the placement position of the cookware is incorrect, output a fault signal and control the electromagnetic heating device to stop heating.

[0031] In a second aspect, an embodiment of the present invention provides an electromagnetic heating device. The electromagnetic heating device includes a cookware detection circuit. The cookware detection circuit includes a controller, a power input terminal, a heating control circuit, a resonant circuit, and a synchronization circuit. The controller is respectively connected to the power input terminal, the heating control circuit, and the synchronization circuit. The resonant circuit is respectively connected to the power input terminal, the heating control circuit, and the synchronization circuit. The controller is used to execute the cookware detection method described in the first aspect embodiment above.

[0032] According to the electromagnetic heating device provided by the embodiment of the present invention, it has at least the following beneficial effects: By the controller sending a single pulse signal, obtaining the number of synchronous flips, and making a preliminary judgment according to the number of synchronous flips to determine whether there is a cookware on the electromagnetic heating device. When it is determined that there is a cookware, then send a low-power pulse signal for a first preset time to the heating control circuit, and at the same time obtain the sampling parameter value. According to the sampling parameter value, the position state of the cookware can be accurately judged. By combining the number of synchronous flips and the sampling parameter value, it can accurately detect whether the placement position of the cookware is correct, which is beneficial to improving the reliability of the use of the electromagnetic heating device.

[0033] In a third aspect, an embodiment of the present invention provides an operation control device, including at least one control processor and a memory communicatively connected to the at least one control processor; the memory stores instructions executable by the at least one control processor, and when the instructions are executed by the at least one control processor, the at least one control processor is enabled to execute the cookware detection method described in the first aspect embodiment above.

[0034] The operation control device provided according to the embodiment of the present invention has at least the following beneficial effects: By sending a single pulse signal, obtaining the number of synchronous flips, making a preliminary judgment based on the number of synchronous flips to determine whether there is a cookware on the electromagnetic heating device. When it is determined that there is a cookware, a low-power pulse signal for a first preset time is sent to the heating control circuit, and at the same time, sampling parameter values are obtained. Based on the sampling parameter values, the position state of the cookware can be accurately judged. By combining the number of synchronous flips and the sampling parameter values, it is possible to accurately detect whether the placement position of the cookware is correct, which is beneficial to improving the reliability of the use of the electromagnetic heating device.

[0035] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions for causing a computer to execute the cookware detection method described in the first aspect embodiment above.

[0036] The computer-readable storage medium provided according to the embodiment of the present invention has at least the following beneficial effects: By sending a single pulse signal, obtaining the number of synchronous flips, making a preliminary judgment based on the number of synchronous flips to determine whether there is a cookware on the electromagnetic heating device. When it is determined that there is a cookware, a low-power pulse signal for a first preset time is sent to the heating control circuit, and at the same time, sampling parameter values are obtained. Based on the sampling parameter values, the position state of the cookware can be accurately judged. By combining the number of synchronous flips and the sampling parameter values, it is possible to accurately detect whether the placement position of the cookware is correct, which is beneficial to improving the reliability of the use of the electromagnetic heating device.

[0037] Other features and advantages of the present invention will be described in the subsequent description, and some of them will become obvious from the description or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below in conjunction with the drawings and embodiments;

[0039] Figure 1 is the circuit structure diagram of the cookware detection circuit provided in the first embodiment of the present invention;

[0040] Figure 2It is the flowchart of the cookware detection method provided in the second embodiment of the present invention;

[0041] Figure 3 It is the flowchart of the cookware detection method provided in the third embodiment of the present invention;

[0042] Figure 4 It is the flowchart of the cookware detection method provided in the fourth embodiment of the present invention;

[0043] Figure 5 It is the flowchart of the cookware detection method provided in the fifth embodiment of the present invention;

[0044] Figure 6 It is the flowchart of the cookware detection method provided in the sixth embodiment of the present invention;

[0045] Figure 7 It is the flowchart of the cookware detection method provided in the seventh embodiment of the present invention;

[0046] Figure 8 It is the flowchart of the cookware detection method provided in the eighth embodiment of the present invention;

[0047] Figure 9 It is the flowchart of the cookware detection method provided in the ninth embodiment of the present invention;

[0048] Figure 10 It is the structural schematic diagram of the operation control device provided in the tenth embodiment of the present invention. Detailed implementation manners

[0049] This part will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the drawings. The function of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be construed as a limitation on the protection scope of the present invention.

[0050] It should be understood that in the description of the embodiments of the present invention, if there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features. "At least one" means one or more, and "a plurality" means two or more. "At least one of the following" and its similar expressions refer to any combination of these items, including any combination of single items or plural items.

[0051] In addition, unless otherwise clearly specified and defined, the term "connected / linked" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection or a connection that allows mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0052] It should be noted that although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order from that in the flowchart. The technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0054] The present invention provides a method for detecting cookware of an electromagnetic heating device, an electromagnetic heating device, and a control device, which can accurately detect whether the placement position of the cookware is correct, and is beneficial to improving the reliability of the use of the electromagnetic heating device.

[0055] As Figure 1 shown, the electromagnetic heating device includes a cookware detection circuit, and the cookware detection circuit includes a power input terminal 100, a heating control circuit 200, a resonance circuit 300, and a synchronization circuit 400. The heating control circuit 200 is provided with a switching tube. The resonance circuit 300 is respectively connected to the power input terminal 100, the heating control circuit 200, and the synchronization circuit 400. The power input terminal 100 is used to provide grid power.

[0056] Specifically, the heating control circuit 200 is provided with a switching tube and a drive circuit 210. The switching tube is an IGBT. The drive circuit 210 is connected to the switching tube. The resonance circuit 300 includes an induction coil disk L1 and a resonance capacitor C1 connected in parallel. The synchronization circuit 400 is used to step down two signals output by the resonance circuit 300. The synchronization circuit 400 includes a first resistor R2 and a second resistor R3.

[0057] It should be noted that the cookware detection circuit further includes a rectifier 700. The rectifier 700 is connected to the power input terminal 100 and is used to convert the AC signal from the power input terminal 100 into a DC signal.

[0058] As Figure 2 shown, based on the above cookware detection circuit, an embodiment of the first aspect of the present invention provides a method for detecting cookware of an electromagnetic heating device. The cookware detection method includes but is not limited to steps S110 to S160:

[0059] Step S110: Send a single pulse signal to the heating control circuit to cause the resonance circuit to oscillate;

[0060] It should be noted that a single pulse signal of 5 - 7 μs is sent first. This pulse signal acts on the heating control circuit 200, causing the switching tube to conduct for a pulse duration. After the induction coil disk L1 is charged, it decays and oscillates with the resonant capacitor C1, that is, the resonant circuit 300 is made to oscillate.

[0061] Step S120: Obtain the number of synchronous flips from the synchronous circuit;

[0062] It can be understood that after triggering a single pulse signal, the number of synchronous flips generated by the synchronous circuit 400 is obtained. Specifically, the number of synchronous flips is mainly calculated from the number of level flips generated by the first resistor R2 and the second resistor R3.

[0063] Step S130: Determine whether there is a cookware on the electromagnetic heating device according to the number of synchronous flips;

[0064] It should be noted that if an iron cookware is placed on the induction coil disk L1, the coupled oscillation damping becomes larger, the oscillation time is short, and the number of generated synchronous flips is small. If there is no cookware on the induction coil disk L1, or the cookware size is too small, or the cookware material is not suitable, the coupled oscillation damping is smaller, the oscillation time is long, and the number of generated synchronous flips is large. According to the number of synchronous flips, it can be preliminarily determined whether there is a cookware on the electromagnetic heating device, which is convenient for improving the detection efficiency.

[0065] Step S140: When it is determined that there is a cookware, send a low - power pulse signal for a first preset time to the heating control circuit;

[0066] If there is a cookware on the electromagnetic heating device, then send a low - power pulse signal for a first preset time to start induction heating, that is, continuously turn on a low - power pulse signal for a fixed time, which is convenient for data collection. It should be noted that the single - pulse time is generally about 7 - 10 μs, and the first preset time is relatively short, generally 1 - 2 ms. By sending short - time continuous pulses, it is possible to avoid generating excessive noise and affecting the user's experience.

[0067] Step S150: Obtain the sampling parameter value, where the sampling parameter value is used to reflect the position state of the cookware;

[0068] Step S160: Determine whether the placement position of the cookware is correct according to the sampling parameter value.

[0069] Specifically, the electromagnetic heating device mainly utilizes the electromagnetic induction characteristic for heating. Since the coupling characteristic between the cookware and the induction coil disk L1 is relatively stable, once the placement position of the cookware is incorrect, such as floating height or deviation, etc., the coupling parameters of the induction coil disk L1 will be changed, thereby affecting the sampling parameter values of the associated circuit, causing the sampling parameter values to change. By obtaining the sampling parameter values, the position state of the cookware can be reflected, and thus it can be determined whether the placement position of the cookware is correct.

[0070] It can be understood that the correct placement position of the cookware means that the placement position of the cookware is within the preset heating area of the electromagnetic heating device.

[0071] The cookware detection method of the electromagnetic heating device provided by the first aspect embodiment above sends a single pulse signal, obtains the number of synchronous flips, makes a preliminary judgment according to the number of synchronous flips to determine whether there is a cookware on the electromagnetic heating device. When it is determined that there is a cookware, a low-power pulse signal for the first preset time is sent to the heating control circuit 200, and at the same time the sampling parameter values are obtained. According to the sampling parameter values, the position state of the cookware can be accurately judged. By combining the number of synchronous flips and the sampling parameter values, it can be accurately detected whether the placement position of the cookware is correct, which is beneficial to improving the reliability of the use of the electromagnetic heating device.

[0072] It should be noted that different from the existing structure mechanical switch detection and other means, the cookware detection method of the embodiment of the present invention does not need to add an additional detection structure, effectively reducing the design cost and material cost.

[0073] In the above cookware detection method, obtaining the sampling parameter values in step S150 includes at least one of the following:

[0074] Step S151: Obtain the C - pole voltage value of the switching tube, and use the C - pole voltage value as the sampling parameter value;

[0075] It should be noted that the switching tube is an IGBT, the C - pole voltage value of the switching tube is the collector voltage value of the IGBT. The C - pole of the switching tube is connected to the second resistor R3. By obtaining the C - pole voltage value of the switching tube, the position state of the cookware can be effectively reflected. If the placement position of the cookware is correct and the coupling inductance is consistent, the detected C - pole voltage value will be stable within the normal range. If the placement position of the cookware is incorrect (such as floating height or deviation, etc.), it will cause the coupling inductance to increase and the C - pole voltage value to become higher, exceeding the normal range value. Judging whether the placement position of the cookware is correct according to the C - pole voltage value can greatly improve the detection accuracy.

[0076] Step S152: Obtain the first resonance frequency from the synchronization circuit, and use the first resonance frequency as the sampling parameter value;

[0077] Specifically, the first resonance frequency is calculated through the first resistor R2 and the second resistor R3 in the synchronization circuit 400. If the placement position of the cookware is incorrect, it will cause the coupling inductance to increase, then the first resonance frequency will become lower and fail to reach the normal range value. Since the resonance frequency is not affected by peripheral factors such as the grid voltage and is only related to the coupling coefficient of the cookware, by obtaining the first resonance frequency, the position state of the cookware can be effectively reflected, and the judgment reliability is high.

[0078] It should be noted that the cookware detection circuit further includes a current detection circuit 500 and a voltage detection circuit 600. The current detection circuit 500 is disposed between the power input terminal 100 and the resonance circuit 300, and the voltage detection circuit 600 is connected to the power input terminal 100. The voltage detection circuit 600 is used to obtain the grid voltage detection value from the power input terminal 100. The current detection circuit 500 includes a sampling resistor RJ1 and a sampling capacitor C3 connected in parallel.

[0079] Step S153: Obtain the first current value from the current detection circuit, adjust the first current value according to the grid voltage detection value to obtain the second current value, and use the second current value as the sampling parameter value.

[0080] It should be noted that the voltage detection value is obtained by voltage division sampling through the third resistor R4, the fourth resistor R5, and the fifth resistor R6, and can effectively reflect the real-time grid voltage detection value. If the placement position of the cookware is correct, the detected first current value will be stable within the normal range. If the placement position of the cookware is incorrect, the first current value will not reach the normal range value. By obtaining the first current value and making corresponding adjustment and value taking according to the real-time grid voltage detection value, the adjusted second current value is obtained, avoiding the current difference caused by the grid voltage difference at the same pulse width time, and can effectively improve the reliability of the sampling parameter value.

[0081] As Figure 3 shown, in the above cookware detection method, the low-power pulse signals are sent multiple times at intervals of the second preset time. Obtaining the first resonance frequency from the synchronization circuit in step S152 includes, but is not limited to, step S210 and step S220:

[0082] Step S210: Obtain the second resonance frequency from the synchronization circuit multiple times;

[0083] Step S220: Calculate the average value of all the second resonance frequencies to obtain the first resonance frequency.

[0084] It should be noted that by continuously sending low-power pulse signals to the heating control circuit 200 multiple times, and each time obtaining the second resonance frequency through the synchronization circuit 400, accumulating the second resonance frequencies obtained multiple times and calculating the average value to obtain the first resonance frequency, by using the calculated first resonance frequency as the sampling parameter value, the reliability of the sampling parameter value can be effectively improved, thereby improving the detection accuracy. Specifically, continuously turn on the low-power pulse three times, with an interval of 0.5 - 1 s each time, then three second resonance frequencies can be obtained, and the first resonance frequency is obtained by calculating the average value of the three second resonance frequencies.

[0085] As Figure 4 shown, in the above-mentioned cookware detection method, the low-power pulse signal is sent multiple times at intervals of the second preset time. Obtaining the first current value from the current detection circuit in step S153 includes, but is not limited to, steps S310 and S320:

[0086] Step S310: Obtain the third current value from the current detection circuit multiple times;

[0087] Step S320: Calculate the average value of all the third current values to obtain the first current value.

[0088] It should be noted that by continuously sending low-power pulse signals to the heating control circuit 200 multiple times, and each time obtaining the third current value through the current detection circuit 500, accumulating the third current values obtained multiple times and calculating the average value to obtain the first current value, the reliability of the sampling parameter value can be effectively improved, thereby improving the detection accuracy. Specifically, continuously turn on the low-power pulse three times, with an interval of 0.5 - 1 s each time, then three third current values can be obtained, and the first current value is obtained by calculating the average value of the three third current values. The first current value is adjusted according to the grid voltage detection value to obtain the second current value, and the second current value is used as the sampling parameter value.

[0089] As Figure 5 shown, in the above-mentioned cookware detection method, determining whether there is a cookware on the electromagnetic heating device according to the synchronous flip number in step S130 includes, but is not limited to, steps S410 and S420:

[0090] Step S410: When the synchronous flip number is less than the preset flip number, it is determined that there is a cookware;

[0091] Step S420: When the synchronous flip number is greater than or equal to the preset flip number, it is determined that there is no cookware or the cookware is abnormal.

[0092] It should be noted that if an iron pot is placed on the induction coil disk L1, the coupled oscillation damping becomes larger, the oscillation time is short, and the number of synchronous flips generated is small. If no pot is placed on the induction coil disk L1, or the pot size is too small, or the pot material is not suitable, the coupled oscillation damping is small, the oscillation time is long, and the number of synchronous flips generated is large. The preset number of flips is obtained through multiple experiments. When the number of synchronous flips is less than the preset number of flips, it is determined that there is a pot. When the number of synchronous flips is greater than or equal to the preset number of flips, it is determined that there is no pot or the pot has an abnormality, and a fault signal is output. Based on the number of synchronous flips, it is possible to preliminarily determine whether there is a pot on the electromagnetic heating device, which is beneficial to improving the detection efficiency.

[0093] As Figure 6 shown, in the above pot detection method, in step S160, determining whether the placement position of the pot is correct according to the sampling parameter value includes, but is not limited to, step S510 and step S520:

[0094] Step S510: When the sampling parameter value is within the preset range, it is determined that the placement position of the pot is correct;

[0095] Step S520: When the sampling parameter value is outside the preset range, it is determined that the placement position of the pot is incorrect.

[0096] It should be noted that if the sampling parameter value is within the preset range, it means that the sampling parameter value reaches the normal range value, and it is determined that the placement position of the pot is correct. If the sampling parameter value is outside the preset range, it means that the sampling parameter value is not the normal range value, and it is determined that the placement position of the pot is incorrect. By setting the preset range, the sampling parameter value is allowed to fluctuate within a certain range, and the judgment basis is more flexible. It can be understood that the sampling parameter value being outside the preset range can mean that the sampling parameter value is greater than the normal range value or less than the normal range value.

[0097] In the above pot detection method, it further includes:

[0098] When it is determined that the placement position of the pot is correct, controlling the electromagnetic heating device to start heating;

[0099] When it is determined that the placement position of the pot is incorrect, outputting a fault signal and controlling the electromagnetic heating device to stop heating.

[0100] It can be understood that if the placement position of the pot is correct, the electromagnetic heating device can be controlled to start normal heating to ensure the stability of the operation of the electromagnetic heating device. If the placement position of the pot is incorrect, outputting a fault signal and controlling the electromagnetic heating device to stop heating can effectively protect the electromagnetic heating device and the pot.

[0101] As Figures 7 to 9As shown, in one embodiment, when the electromagnetic heating device is started and the pan detection work begins, a single pulse signal is sent to obtain the synchronous flip number. The preset flip number is 7. When the synchronous flip number ≥ 7, it indicates that there is no cookware or the cookware is abnormal, and a fault is reported. When the synchronous flip number < 7, it indicates that there is cookware, and a low-power pulse signal of 2 ms is sent to obtain the sampling parameter values (C-pole voltage value, first resonance frequency, second current value). If the sampling parameter values are within the preset range, it indicates that the placement position of the cookware is correct and normal heating starts. If the sampling parameter values are outside the preset range, it indicates that the placement position of the cookware is incorrect, a fault is reported, and heating is stopped simultaneously.

[0102] The second aspect embodiment of the present invention provides an electromagnetic heating device. The electromagnetic heating device includes a pan detection circuit. The pan detection circuit includes a controller MCU, a power input terminal 100, a heating control circuit 200, a resonance circuit 300, and a synchronization circuit 400. The controller MCU is respectively connected to the power input terminal 100, the heating control circuit 200, and the synchronization circuit 400. The resonance circuit 300 is respectively connected to the power input terminal 100, the heating control circuit 200, and the synchronization circuit 400. The controller MCU is used to execute the pan detection method of the first aspect embodiment as above. For example, execute the Figure 2 method steps S110 to S160 in Figure 3 method steps S210 and S220 in Figure 4 method steps S310 and S320 in Figure 5 method steps S410 and S420 in Figure 6 method steps S510 and S520 in. By sending a single pulse signal through the controller MCU, obtaining the synchronous flip number, and making a preliminary judgment based on the synchronous flip number to determine whether there is cookware on the electromagnetic heating device. When it is determined that there is cookware, a low-power pulse signal of the first preset time is sent to the heating control circuit 200, and at the same time, the sampling parameter values are obtained. Based on the sampling parameter values, the position state of the cookware can be accurately judged. By combining the synchronous flip number and the sampling parameter values, it is possible to accurately detect whether the placement position of the cookware is correct, which is beneficial to improving the reliability of the use of the electromagnetic heating device.

[0103] It should be noted that the electromagnetic heating device can be products such as an induction cooker and a stir-fry machine that utilize electromagnetic induction characteristics for heating, and special cookware needs to be used in combination.

[0104] As Figure 10 shown, the third aspect embodiment of the present invention provides an operation control device 1000, including at least one control processor 1010 and a memory 1020 for communicating with at least one control processor 1010; the control processor 1010 and the memory 1020 can be connected through a bus or other means. Figure 10An example of connection via a bus is shown. The memory 1020 stores instructions that can be executed by at least one control processor 1010. The instructions are executed by at least one control processor 1010 so that at least one control processor 1010 can execute the cookware detection method according to the embodiment of the first aspect as described above. For example, execute the Figure 2 method steps S110 to S160 in Figure 3 method steps S210 and S220 in Figure 4 method steps S310 and S320 in Figure 5 method steps S410 and S420 in Figure 6 method steps S510 and S520 in . By sending a single pulse signal, the number of synchronous flips is obtained. Based on the number of synchronous flips, a preliminary judgment is made to determine whether there is a cookware on the electromagnetic heating device. When it is determined that there is a cookware, a low-power pulse signal for the first preset time is sent to the heating control circuit 200. At the same time, the sampling parameter value is obtained. Based on the sampling parameter value, the position state of the cookware can be accurately judged. By combining the number of synchronous flips and the sampling parameter value, it is possible to accurately detect whether the placement position of the cookware is correct, which is beneficial to improving the reliability of the use of the electromagnetic heating device.

[0105] An embodiment of the fourth aspect of the present invention provides a computer-readable storage medium. The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions can be used to cause a computer to execute the cookware detection method according to the embodiment of the first aspect as described above. For example, execute the Figure 2 method steps S110 to S160 in Figure 3 method steps S210 and S220 in Figure 4 method steps S310 and S320 in Figure 5 method steps S410 and S420 in Figure 6 method steps S510 and S520 in . By sending a single pulse signal, the number of synchronous flips is obtained. Based on the number of synchronous flips, a preliminary judgment is made to determine whether there is a cookware on the electromagnetic heating device. When it is determined that there is a cookware, a low-power pulse signal for the first preset time is sent to the heating control circuit 200. At the same time, the sampling parameter value is obtained. Based on the sampling parameter value, the position state of the cookware can be accurately judged. By combining the number of synchronous flips and the sampling parameter value, it is possible to accurately detect whether the placement position of the cookware is correct, which is beneficial to improving the reliability of the use of the electromagnetic heating device.

[0106] Those of ordinary skill in the art will understand that all or some of the steps and systems disclosed above can be implemented as software, firmware, hardware, and their appropriate combinations. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or can be implemented as hardware, or can be implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium or a non-transitory medium and a communication medium or a transitory medium. As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0107] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for detecting cookware of an electromagnetic heating device, characterized in that, The electromagnetic heating device includes a pan detection circuit. The pan detection circuit includes a power input terminal, a heating control circuit, a resonant circuit, and a synchronization circuit. The heating control circuit is provided with a switching tube. The pan detection circuit further includes a current detection circuit and a voltage detection circuit. The current detection circuit is disposed between the power input terminal and the resonant circuit. The voltage detection circuit is used to obtain a grid voltage detection value from the power input terminal. The pan detection method includes: Sending a single pulse signal to the heating control circuit to cause the resonant circuit to oscillate; Obtaining the number of synchronous flips from the synchronization circuit; Judging whether there is a pan on the electromagnetic heating device according to the number of synchronous flips; When it is determined that there is a pan, sending a low-power pulse signal with a first preset time to the heating control circuit; Obtaining a sampling parameter value, where the sampling parameter value is used to reflect the position state of the pan; When the sampling parameter value is within a preset range, determining that the placement position of the pan is correct; When the sampling parameter value is outside the preset range, determining that the placement position of the pan is incorrect; The obtaining of the sampling parameter value simultaneously includes the following three types: Obtaining the C-terminal voltage value of the switching tube and using the C-terminal voltage value as the sampling parameter value; Obtaining a first resonant frequency from the synchronization circuit and using the first resonant frequency as the sampling parameter value; Obtaining a first current value from the current detection circuit, adjusting the first current value according to the grid voltage detection value to obtain a second current value, and using the second current value as the sampling parameter value.

2. The cookware detection method according to claim 1, wherein The low-power pulse signal is sent multiple times at intervals of a second preset time. The obtaining of the first resonant frequency from the synchronization circuit includes: Obtaining the second resonant frequency from the synchronization circuit multiple times; Calculating the average value of all the second resonant frequencies to obtain the first resonant frequency.

3. The cookware detection method according to claim 1, characterized in that The low-power pulse signal is sent multiple times at intervals of a second preset time. The obtaining of the first current value from the current detection circuit includes: Obtaining a third current value from the current detection circuit multiple times; Calculating the average value of all the third current values to obtain the first current value.

4. The cookware detection method according to claim 1, wherein, The judging whether there is a pan on the electromagnetic heating device according to the number of synchronous flips includes: When the number of synchronous flips is less than a preset number of flips, determining that there is a pan; When the number of synchronous flips is greater than or equal to the preset number of flips, determining that there is no pan or the pan is abnormal.

5. The cookware detection method according to claim 1, wherein, It further includes: When it is determined that the placement position of the pan is correct, controlling the electromagnetic heating device to start heating; When it is determined that the placement position of the pan is incorrect, outputting a fault signal and controlling the electromagnetic heating device to stop heating.

6. An electromagnetic heating device, characterized in that, The electromagnetic heating device includes a pan detection circuit, and the pan detection circuit includes a controller, a power input terminal, a heating control circuit, a resonant circuit, and a synchronization circuit. The controller is respectively connected to the power input terminal, the heating control circuit, and the synchronization circuit. The resonant circuit is respectively connected to the power input terminal, the heating control circuit, and the synchronization circuit. The controller is configured to execute the pan detection method according to any one of claims 1 to 5.

7. An operation control device, characterized in that, It includes at least one control processor and a memory for communicatively connecting with the at least one control processor; the memory stores instructions executable by the at least one control processor, and the instructions are executed by the at least one control processor to enable the at least one control processor to execute the pan detection method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to execute the pan detection method according to any one of claims 1 to 5.

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