No-load detection device, no-load detection method and storage medium

Abstract

The invention provides a no-load detection device, a no-load detection method and a storage medium, the no-load detection device is used for cooking equipment, the cooking equipment comprises a processor and a microwave heating module, and the microwave heating module is electrically connected with the processor. The no-load detection device comprises a power supply control module, infrared pair transistor modules and a threshold value adjusting module which are electrically connected with the processor, and the infrared pair transistor modules are multiple in number, electrically connected with the power supply control module and the threshold value adjusting module and used for detecting whether no load exists or not. According to the invention, a plurality of groups of infrared geminate transistor modules are adopted to directly detect whether an object exists in the cavity or not, so that multi-angle coverage of the space of the cavity is realized, and misjudgment caused by food position deviation or local high temperature is avoided through cross validation of a plurality of groups of data; the detection of the infrared geminate transistor module depends on a transmitting-receiving frequency or voltage feedback mechanism instead of temperature distribution change, so that the no-load misjudgment rate is effectively reduced and the reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and more specifically, to an unloaded detection device, an unloaded detection method, and a storage medium. Background Technology

[0002] A microwave oven is a cooking device that uses microwaves to heat food. It mainly consists of a power supply, a magnetron, a control circuit, and a cooking cavity. Its working principle is that food absorbs microwave energy and produces a heating effect.

[0003] If the user misoperates during use (starting the machine without placing food), the device will run unloaded. In this case, the microwaves generated by the magnetron will be absorbed by the magnetron, cavity, microwave stirrer, and other microwave oven components without food absorption, causing high-temperature damage to the magnetron, high-temperature deformation of the cavity, and arcing of the stirrer, thus reducing the overall reliability of the machine.

[0004] To address this, Chinese Patent Application No. 201911371188.X discloses a cooking device including a cavity, a tray disposed at the bottom of the cavity, an infrared sensor disposed on the inner wall of the cavity, and a controller connected to the infrared sensor. The infrared sensor's field of view covers the tray, receives infrared radiation emitted by objects, and converts the received infrared radiation into temperature values. The controller determines whether an object is placed on the tray based on the temperature values ​​transmitted by the infrared sensor. This solution senses infrared radiation emitted by objects within its field of view and converts it into temperature values, performing no-load detection based on the temperature distribution within the field of view or based on the temperature changes in different areas of the tray per unit time. However, its accuracy is poor due to the influence of object size. Especially for dual magnetron microwave ovens, not only is the accuracy poor, but the damage from no-load operation is also more significant, greatly increasing the risk of product failure.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] The problem solved by this invention is that the accuracy of existing microwave oven no-load operation detection methods is low, which cannot meet the detection requirements of large dual magnetron microwave ovens.

[0007] To address the aforementioned problems, the present invention provides an unloaded detection device for a cooking device. The cooking device includes a processor and a microwave heating module, the microwave heating module being electrically connected to the processor. The unloaded detection device includes a power control module, an infrared photodiode module, and a threshold adjustment module, all electrically connected to the processor. Multiple sets of infrared photodiode modules are electrically connected to the power control module and the threshold adjustment module, respectively, for detecting whether the device is unloaded.

[0008] Preferably, the cooking device further includes a cavity, the bottom of which is provided with a rotatable turntable for placing food; multiple sets of infrared photodiode modules are located below the side and / or at the top of the cavity, each set of infrared photodiode modules includes a transmitting tube and a receiving tube, the transmitting tube and the receiving tube being electrically connected to the processor respectively. Preferably, the microwave heating module consists of a first magnetron and a second magnetron.

[0009] Preferably, the infrared photodiode module is arranged horizontally, and the transmitting tube and receiving tube are located on the same side or opposite sides of the cavity.

[0010] Preferably, the cooking device further includes a UI module, which is electrically connected to the processor and is used to interact with the user.

[0011] The present invention also provides an unloaded detection method, employing the above-mentioned unloaded detection device, comprising:

[0012] S1. The cooking equipment is powered on and starts the no-load detection device, which includes N sets of infrared photocell modules;

[0013] The transmitting tubes of the S2 and N groups of infrared photodiode modules emit infrared rays, and the corresponding receiving tubes generate voltages V1, V2...V respectively. i ...V n , where i takes values ​​from 1 to N;

[0014] S3, The processor receives and determines whether V1≥V simultaneously. c1 V2≥V c1... V i ≥V c1 ...V n ≥V c1 Or both conditions must be met: V1≤V c1 V2≤V c1... V i ≤V c1 ...V n ≤V c1 If yes, then the microwave heating module will not be started; otherwise, proceed to step S4.

[0015] S4. Determine if V exists. i <V c1 And |V i- V c1 If |>ΔV1, then start the microwave heating module; otherwise, proceed to step S5.

[0016] S5. Determine if V exists. i <V c1 And |V i- V c1If |≤ΔV1, then the processor activates the threshold adjustment module, and then the emitting tubes of the N groups of infrared photodiode modules emit infrared rays, and the corresponding receiving tubes generate voltage V. 11 V 12 ...V 1j ...V 1n , where j takes values ​​from 1 to N;

[0017] S6, The processor receives and determines whether V exists. 1j <V c2 And |V 1j- V c2 If |>ΔV2, then the microwave heating module is started; otherwise, the microwave heating module is not started.

[0018] Preferably, in steps S3 and S6, when the microwave heating module is not activated, the processor prompts the user to place food into the cavity through the UI module.

[0019] The present invention also provides an unloaded detection method, employing the above-mentioned unloaded detection device, comprising:

[0020] S1. The cooking equipment is powered on and starts the no-load detection device, which includes N sets of infrared photocell modules;

[0021] S2, The processor transmits at a frequency of f to the transmitter tube. 11 The signal, the receiving tubes 42 of the N groups of infrared photodiode modules respectively acquire the frequency f 21 f 22 ...f 2k ...f 2n The signal, where k takes values ​​from 1 to N;

[0022] S3, The processor receives and determines whether f exists. 2k ≠f 11 If yes, then the microwave heating module is activated; otherwise, the microwave heating module is not activated.

[0023] The present invention also provides a readable storage medium on which an application program is stored, and which implements the above-described idle detection method when executed by a processor.

[0024] Compared with the prior art, the no-load detection device, no-load detection method and storage medium described in the embodiments of the present invention have the following beneficial effects: 1) Multiple sets of infrared tube modules are used to directly detect whether there is an object in the cavity, achieving multi-angle coverage of the cavity space. Cross-verification of multiple sets of data avoids misjudgment caused by food position displacement or local high temperature; 2) The detection of the infrared tube module relies on the transmission-reception frequency or voltage feedback mechanism rather than temperature distribution change, effectively reducing the no-load misjudgment rate and improving reliability; 3) It adapts to different cooking environments (such as cavity temperature changes or food types), thereby meeting the detection needs of cooking equipment such as large dual magnetron microwave ovens; 4) Power is supplied only during detection to avoid continuous power consumption. The entire detection process is completed in milliseconds, effectively reducing preheating delay and reducing energy efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the no-load detection device described in Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the infrared photodiode module described in Embodiment 1 of the present invention installed on the side of a cooking device;

[0027] Figure 3 This is another schematic diagram of the infrared photodiode module described in Embodiment 1 of the present invention installed on the side of the cooking equipment;

[0028] Figure 4 This is another schematic diagram of the infrared photodiode module described in Embodiment 1 of the present invention installed on the side of the cooking equipment;

[0029] Figure 5 This is another schematic diagram of the infrared photodiode module described in Embodiment 1 of the present invention installed on the side of the cooking equipment;

[0030] Figure 6 This is a schematic diagram of the infrared photodiode module described in Embodiment 1 of the present invention installed on the top of a cooking device;

[0031] Figure 7 This is another schematic diagram of the infrared photodiode module described in Embodiment 1 of the present invention installed on the top of a cooking device;

[0032] Figure 8 This is a schematic diagram of the infrared photodiode module described in Embodiment 1 of the present invention installed on both sides of a cooking device;

[0033] Figure 9 This is another schematic diagram showing the infrared photodiode module described in Embodiment 1 of the present invention installed on both sides of a cooking device;

[0034] Figure 10 This is a schematic flowchart of the detection method of the no-load detection device described in Embodiment 2 of the present invention;

[0035] Figure 11 This is another flowchart of the detection method of the no-load detection device described in Embodiment 3 of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100-Cooking equipment; 1-Processor; 2-UI module; 3-Power control module; 4-Infrared pair module; 41-Emitting tube; 42-Receiving tube; 5-Threshold adjustment module; 6-Microwave heating module; 10-Turntable. Detailed Implementation

[0038] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Without conflict, the technical features of the embodiments of the present invention can be combined with each other.

[0039] With the increasing demands of modern families for kitchen appliances, the heating efficiency and uniformity of cooking equipment such as microwave ovens and steam ovens have become key concerns for users. Dual magnetron cooking equipment has emerged as a result. However, due to the significantly increased microwave output per unit time, the hazards of no-load operation are also greatly increased. Therefore, the applicant proposes the following technical solution:

[0040] Example 1

[0041] like Figure 1-9 As shown, an idle detection device is used in a cooking device 100. The cooking device 100 includes a processor 1 and a microwave heating module 6, which are electrically connected to the processor 1. The idle detection device includes a power control module 3, an infrared photodiode module 4, and a threshold adjustment module 5, all of which are electrically connected to the processor 6. There are multiple sets of infrared photodiode modules 4, which are electrically connected to the power control module 3 and the threshold adjustment module 5, respectively, for detecting whether the device is idle.

[0042] This invention employs multiple sets of infrared tube modules 4 to directly detect the presence of objects within the cavity, achieving multi-angle coverage of the cavity space. Cross-validation using multiple sets of data avoids misjudgments caused by food displacement or localized high temperatures. The detection of the infrared tube modules relies on a transmit-receive frequency or voltage feedback mechanism rather than temperature distribution changes, effectively reducing the no-load misjudgment rate and improving reliability. The threshold adjustment module 5 utilizes existing technology, allowing dynamic adjustment of the detection threshold to adapt to different cooking environments (such as cavity temperature changes or food types), thus meeting the detection needs of large dual-magnetron microwave ovens and other cooking equipment. The power control module 3 supplies power only during detection to avoid continuous power consumption. The entire detection process is completed in milliseconds, effectively reducing preheating delay to improve user experience and energy efficiency.

[0043] Specifically, after the cooking device 100 starts operating, the processor 1 supplies power to the infrared photodiode module 4 via the power control module 3 and initiates infrared transmission and reception feedback. If the voltage value returned by the receiving tube 42 is low or a certain frequency electrical signal is not received, it indicates that there is food in the cavity. If the voltage value returned by the receiving tube 42 is high or a certain frequency signal is received, it indicates that there is no food. Based on this characteristic, it is possible to accurately detect whether food is placed in the microwave oven. When no food is detected, the door will be closed and an alarm will be triggered before starting the microwave oven, thus preventing operation under no-load conditions. For voltage signal recognition, the receiving tube 42 can also output a higher voltage when food is placed and a lower voltage when no food is placed.

[0044] As an example of the present invention, the cooking device 100 further includes a UI module 2, which is electrically connected to the processor 1 and is used to receive user commands or output detection results.

[0045] As an example of the present invention, the cooking device 100 further includes a cavity, the bottom of which is provided with a rotatable turntable 10 for placing food; multiple sets of infrared photodiode modules 4 are located below the side and / or the top of the cavity, each set of infrared photodiode modules 4 includes a transmitting tube 41 and a receiving tube 42, the transmitting tube 41 and the receiving tube 42 being electrically connected to the processor 1 respectively.

[0046] This setup utilizes the infrared photocell module 4 located on the lower side to cover the edge of the turntable 10 and low-lying foods (such as dishes in shallow dishes), preventing food from sticking to the wall and going undetected; while the infrared photocell module 4 located at the top can cover the central area of ​​the turntable 10, ensuring that small foods (such as eggs) are detected.

[0047] As an example of the present invention, the infrared photodiode modules 4 located below or at the top of the cavity are arranged at equal intervals in the horizontal direction. The transmitting tube 41 and the receiving tube 42 are located on the same side of the cavity, such as below the left or right side, front or rear side, or on both sides of the cavity. Multiple sets of the infrared photodiode modules 4 are located at the top of the cavity and are arranged at equal intervals in the length or width direction.

[0048] Preferably, at least one of the multiple sets of infrared photodiode modules 4 is located on the side of the cavity, and the other set is located on the top of the cavity. The infrared photodiode modules 4 rely on food reflection signals rather than reflections from the cavity's metal walls, significantly reducing noise; by synchronously emitting signals from multiple sets of infrared photodiode modules 4 to detect food, the superposition of reflected signals improves the sensitivity for small object recognition. Simultaneously, the multiple sets of infrared photodiode modules 4 form a gridded detection area, ensuring that food at any position on the turntable 10 is covered by at least two sets of modules.

[0049] Example 2

[0050] like Figure 10 As shown, the present invention also provides an unloaded detection method, comprising the following steps:

[0051] S1. The cooking equipment 100 is powered on and starts the no-load detection device, which includes N sets of infrared photocell modules 4.

[0052] Specifically, when the cooking device 100 is powered on and the door is closed, and the user inputs the start of the microwave heating module 6 through the UI module, the processor 1 outputs power through the power control module 3 and supplies it to the infrared phototransistor module 4.

[0053] S2 and N sets of infrared photoelectric transistor modules 4 emit infrared rays through their emitting diodes 41, and the corresponding receiving diodes 42 generate voltages V1, V2...V1 respectively. i ...V n , where i takes values ​​from 1 to N;

[0054] S3. Processor 1 receives and determines whether V1≥V1 simultaneously. c1 V2≥V c1... V i ≥V c1 ...V n ≥V c1 Or both conditions must be met: V1≤V c1 V2≤V c1... V i ≤V c1 ...V n ≤V c1 If yes, then the microwave heating module 6 will not be activated and the user can place food through the UI module; otherwise, proceed to step S4.

[0055] S4. Determine if V exists. i <V c1 And |V i- V c1 If |>ΔV1, then start microwave heating module 6; otherwise, proceed to step S5.

[0056] S5. Determine if V exists. i <V c1 And |V i- V c1 If |≤ΔV1, then processor 1 activates threshold adjustment module 5, and then the emitting tubes 41 of N sets of infrared photodiode modules 4 emit infrared rays, and the corresponding receiving tubes 42 generate voltage V respectively. 11 V 12 ...V 1j ...V 1n , where j takes values ​​from 1 to N;

[0057] S6. Processor 1 receives and determines whether V exists. 1j <V c2 And |V 1j- V c2 If |>ΔV2, then microwave heating module 6 is activated; otherwise, microwave heating module 6 is not activated. The V c1 V c2 The settings are based on the cavity size and reflection characteristics; for example, a 30L microwave oven can be set to V. c1 V c2 The values ​​are 1.2V and 1.5V respectively, with ΔV1 and ΔV2 being 0.18V and 0.16V respectively. This is the setting for a 60L steam oven. c1 V c2 The values ​​are 0.8V and 1.2V respectively, and ΔV1 and ΔV2 are 0.20V and 0.18V respectively.

[0058] When the cooking device 100 is running, the processor 1 supplies power to the infrared photodiode module 4 through the power control module 3. Then, the emitting tube 41 of the infrared photodiode module 4 emits infrared rays, and the collector and emitter of the receiver tube 42 generate a certain voltage value. Based on the voltage value, it is determined whether there is food in the cavity.

[0059] Example 3

[0060] like Figure 11 As shown, the present invention also provides an unloaded detection method, comprising the following steps:

[0061] S1. The cooking equipment 100 is powered on and starts the no-load detection device, which includes N sets of infrared photocell modules 4.

[0062] S2, Processor 1 transmits at a frequency of f to transmitter 41. 11 The signal, the receiving tubes 42 of the N groups of infrared photodiode modules 4 respectively acquire the frequency f 21 f 22 ...f 2k ...f 2n The signal, where k takes values ​​from 1 to N;

[0063] S3, Processor 1 receives and determines whether f exists. 2k ≠f 11 If yes, then microwave heating module 6 will be started; otherwise, microwave heating module 6 will not be started.

[0064] When the cooking device 100 is running, the processor 1 supplies power to the infrared photodiode module 4 through the power control module 3. The processor 1 sends a certain frequency signal to the transmitting tube 41 of the infrared photodiode module 4. If the receiving tube 42 of the infrared photodiode module 4 has a frequency different from the transmission frequency, it will feed back to the processor 1. At this time, there is food in the cavity. Then the power control module 3 is disconnected and the microwave heating module 6 is started to start heating.

[0065] Example 4

[0066] The present invention also provides an unloaded detection method, comprising the following steps:

[0067] S1. The cooking equipment 100 is powered on and starts the no-load detection device, which includes N sets of infrared photocell modules 4.

[0068] S2, Processor 1 transmits at a frequency of f to transmitter 41. 11 The signal, the receiving tubes 42 of the N groups of infrared photodiode modules 4 respectively acquire the frequency f 21 f 22 ...f 2k ...f 2n The signal, where k takes values ​​from 1 to N;

[0069] S3, Processor 1 receives and determines whether f exists. 2k ≠f 11 If yes, proceed to step S4; otherwise, do not start the microwave heating module 6.

[0070] S4 and N sets of infrared photoelectric transistor modules 4 emit infrared rays through their emitting diodes 41, and the corresponding receiving diodes 42 generate voltages V1, V2...V respectively. i ...V n , where i takes values ​​from 1 to N;

[0071] S5. Processor 1 receives and determines whether V1≥V1 simultaneously. c1 V2≥V c1... V i ≥V c1 ...V n ≥V c1 Or both conditions must be met: V1≤V c1 V2≤V c1... V i ≤V c1 ...V n ≤V c1 If yes, then the microwave heating module 6 will not be activated and the user will be provided with the option to place food via the UI module; otherwise, proceed to step S6.

[0072] S6. Determine if V exists. i <Vc1 And |V i- V c1 If |>ΔV1, then start microwave heating module 6; otherwise, proceed to step S7.

[0073] S7. Determine if V exists. i <V c1 And |V i- V c1 If |≤ΔV1, then processor 1 activates threshold adjustment module 5, and then the emitting tubes 41 of N sets of infrared photodiode modules 4 emit infrared rays, and the corresponding receiving tubes 42 generate voltage V respectively. 11 V 12 ...V 1j ...V 1n , where j takes values ​​from 1 to N;

[0074] S8, Processor 1 receives and determines whether V exists. 1j <V c2 And |V 1j- V c2 If |>ΔV2, then microwave heating module 6 is started; otherwise, microwave heating module 6 is not started.

[0075] This solution addresses the issue of poor accuracy in traditional infrared temperature detection due to the frequency difference detection relying on signal phase shift, thus being unaffected by thermal radiation / steam. The voltage value reflects the intensity of infrared reflection, and the spatial distribution of multiple modules solves the problem of object offset. This solution is particularly suitable for high-power, multi-interference dual magnetron cooking equipment.

[0076] The present invention also provides a readable storage medium storing an application program, which, when executed by a processor, implements the above-described idle detection method. The readable storage medium has the same beneficial effects as the idle detection method, and will not be elaborated upon here.

[0077] The computer-readable storage medium can be a readable storage medium or a readable signal medium, such as a USB flash drive, portable hard drive, ROM, RAM, magnetic disk, or optical disk. In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection can be through some interfaces; the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0078] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An unloaded detection device for a cooking device (100), the cooking device (100) comprising a processor (1) and a microwave heating module (6), the microwave heating module (6) being electrically connected to the processor (1), characterized in that, The no-load detection device includes a power control module (3), an infrared photodiode module (4), and a threshold adjustment module (5) that are electrically connected to the processor (6). There are multiple sets of infrared photodiode modules (4) that are electrically connected to the power control module (3) and the threshold adjustment module (5) respectively, and are used to detect whether there is no load.

2. The no-load detection device according to claim 1, characterized in that, The cooking device (100) also includes a cavity, the bottom of which is provided with a rotatable turntable (10) for placing food; multiple sets of infrared photodiode modules (4) are located below and / or on the side of the cavity, each set of infrared photodiode modules (4) includes a transmitting tube (41) and a receiving tube (42), the transmitting tube (41) and the receiving tube (42) being electrically connected to the processor (1) respectively.

3. The no-load detection device according to claim 2, characterized in that, The infrared pair module (4) is arranged in a horizontal direction, and the transmitting tube (41) and receiving tube (42) are located on the same side or opposite side of the cavity.

4. The no-load detection device according to claim 1, characterized in that, The cooking device (100) also includes a UI module (2), which is electrically connected to the processor (1) and is used to interact with the user.

5. A method for detecting no-load conditions, using the no-load detection device described in claims 1-3, characterized in that, include: S1. The cooking equipment (100) is powered on and starts the no-load detection device, which includes N sets of infrared tube modules (4). The emitting tubes (41) of the infrared photodiode modules (4) in groups S2 and N emit infrared rays, and the corresponding receiving tubes (42) generate voltages V1, V2...V respectively. i ...V n , where i takes values ​​from 1 to N; S3, The processor (1) receives and determines whether V1≥V is satisfied simultaneously. c1 V2≥V c1... V i ≥V c1 ...V n ≥V c1 Or both conditions must be met: V1≤V c1 V2≤V c1... V i ≤V c1 ...V n ≤V c1 If yes, then the microwave heating module (6) will not be started; otherwise, proceed to step S4. S4. Determine if V exists. i <V c1 And |V i- V c1 If |>ΔV1, then start the microwave heating module (6); otherwise, proceed to step S5; S5. Determine if V exists. i <V c1 And |V i- V c1 If |≤ΔV1, then the processor (1) starts the threshold adjustment module (5), and then the emitting tubes (41) of the N groups of infrared photodiode modules (4) emit infrared rays, and the corresponding receiving tubes (42) generate voltage V respectively. 11 V 12 ...V 1j ...V 1n , where j takes values ​​from 1 to N; S6, The processor (1) receives and determines whether V exists. 1j <V c2 And |V 1j- V c2 If |>ΔV2, then the microwave heating module (6) is started; otherwise, the microwave heating module (6) is not started.

6. The no-load detection method according to claim 5, characterized in that, In steps S3 and S6, when the microwave heating module (6) is not started, the processor (1) prompts the user to place food into the cavity through the UI module (2).

7. A method for detecting no-load conditions, using the no-load detection device described in claims 1-3, characterized in that, include: S1. The cooking equipment (100) is powered on and starts the no-load detection device, which includes N sets of infrared tube modules (4). S2, The processor (1) transmits at a frequency of f to the transmitter (41). 11 The signal, the receiving tubes (42) of the N groups of infrared photodiode modules (4) respectively acquire the frequency f 21 f 22 ...f 2k ...f 2n The signal, where k takes values ​​from 1 to N; S3, The processor (1) receives and determines whether f exists. 2k ≠f 11 If yes, then the microwave heating module (6) is started; otherwise, the microwave heating module (6) is not started.

8. A readable storage medium, characterized in that, The readable storage medium stores an application program, which, when executed by a processor, implements the idle detection method according to any one of claims 5-7.

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