Electromagnetic range overflow detection method
The capacitive sensing device detects overflow and adjusts the heating power, which solves the problem of induction stove error detection and overflow stop working, realizes the stability of overflow recognition and the continuity of the cooking process, and improves the user experience.
Patent Information
- Application Number
- CN202310781698.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-28
- Publication Date
- 2024-12-31
AI Technical Summary
The existing induction stove stops working after detecting overflow, and there are problems such as mis-checking and the inability to continue cooking when a small amount of overflow is overflowed, resulting in poor user experience.
The overflow on the panel is detected by a capacitance sensing device, the capacitance value is recorded, and the power of the heating coil is adjusted by using the control circuit board, and the overflow situation is detected multiple times to prevent false detection and reduce the heating power to prevent overflow.
Effectively prevent mis-detection, adjust heating power, ensure the continuity of the cooking process, improve user experience, and is suitable for overflow recognition of different pot sizes.
Smart Images
Figure CN119222587A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of household appliances, and in particular to an electromagnetic cooker overflow detection method. Background Art
[0002] When the induction cooker is cooking soup or porridge, the soup or porridge cooked on the induction cooker will boil due to long-term cooking, causing the food in the pot to overflow outside the pot, which is inconvenient to clean. At the same time, during the long cooking process, the user needs to always pay attention to whether the food in the pot overflows, and cannot concentrate on doing other things, which wastes the user's time and has a poor user experience. Existing induction cookers that can detect whether the food overflows stop working after detecting the overflow, and there are the following problems: when the food falls or the user wipes it, it is easy to make a false detection; when a small amount of overflow occurs, the overflow amount is within the acceptable range for the user, but the product stops working, resulting in the inability to cook, and the user experience is poor. Summary of the invention
[0003] The existing electromagnetic cooker with the function of detecting whether food overflows stops working upon detecting overflow, and there are problems such as false detection or inability to cook due to a small amount of overflow. The purpose of the present invention is to provide an electromagnetic cooker overflow detection method, which prevents false detection and adjusts the heating power by detecting overflow multiple times.
[0004] To achieve the above object, the present invention provides the following technical solution: an electromagnetic cooker overflow detection method, the electromagnetic cooker comprises a housing, a panel, a control circuit board and a heating furnace arranged below the panel, the heating furnace comprises a heating coil and a capacitive sensing device for detecting overflow on the panel, the heating coil and the capacitive sensing device are both electrically connected to the control circuit board, the overflow detection method comprises the following steps: Step 100: Start the electromagnetic cooker and record the capacitance value of the capacitance sensing device as the background noise value A0; Step 200: During the cooking process, the capacitance value of the capacitive sensing device is recorded as A1; Step 300: When the absolute value of A1-A0 is continuously k When the duration is greater than the program setting value m1, the heating coil power is reduced to p1% of the original setting power.
[0005] In the technical solution, the capacitive sensing device of the electromagnetic cooker detects whether there is spillage on the panel. The capacitance generated by the capacitive sensing device and the panel it is in close contact with is different when there is no spillage on the panel and when there is spillage on the panel. The capacitance value of the capacitive sensing device during cooking is detected and recorded. The capacitive sensing device is connected to the control circuit board through a wire, and the control circuit board is used to adjust the power of the heating coil. When the electromagnetic cooker is started, the capacitance value of the capacitive sensing device is recorded and recorded as the background noise value A0. In order to avoid noise interference, filtering is performed, that is, the capacitance value data with large or small values is removed and is not used as data for the average value calculation (the data range of different pots and prepared materials needs to be tested as a reference value, and data outside the range is not recorded). During the cooking process, the capacitance value of the capacitive sensing device is recorded at intervals or in real time, recorded as A1; when the absolute value of A1-A0 is continuously t k When the duration is greater than the program setting value m1, continuous t k The duration is to avoid false detections such as food spilling or being wiped by the user. The heating coil power is reduced to p1% of the original set power.
[0006] The present invention is further configured to include the following steps after step 300: Step 400: The number of chip cumulative overflows is recorded as n; Step 500: During the cooking process, continue to record the capacitance value of the capacitive sensing device, recorded as A n+1 , Step 600: When A n+1 -A n The absolute value of the continuous t k The duration is greater than the program setting value m n+1 When the heating coil power is reduced to p of the original set power n+1 %,p n+1 <p n ; Step 700: Repeat steps 400 to 600. When n in step 600 is greater than the set value z, stop working and report overflow.
[0007] In this technical solution, when recording the capacitance value of the capacitance sensing device at intervals, it is recorded as A n , the number of times the chip records overflow is recorded as n. When n = 1, the interval recording time is T1. When the absolute value of A1-A0 is greater than the program setting value m1 for k consecutive times, where the consecutive k times are to avoid false triggering by noise, the product of the interval recording time T1 and the number of recording times k is the continuous time length t k , the continuous duration of the record is t k When the heating coil power is reduced to p1% of the original set power, the chip records the overflow times as n=1. n+1 -An The absolute value of is greater than the program setting value m for k consecutive times n+1 The heating coil power is reduced to p of the original set power for k consecutive times to avoid false triggering due to noise. n+1 , the last reduction of the heating coil power is based on the previous reduction of the heating coil power, so p n+1 <p n , and when m is greater than the set value z, it stops working and reports water overflow. When the error is ignored, m n+1 = m1; Considering that the capacitance changes the most during the first overflow, m n+1 <m n .
[0008] The present invention is further configured as follows: in step 100, the background noise value A0 is the value before t after the electromagnetic cooker is started. s The background noise value A0 is filtered to avoid noise interference, that is, after starting the induction cooker, the capacitance value is recorded, and the data with large and small capacitance values are removed and not used as data for average value calculation (the data range of different pots and condiments needs to be tested as a reference value, and the data outside the range is not recorded), and then the remaining data before t is taken. s The average value of capacitance over time.
[0009] The present invention is further configured as follows: in step 200, the capacitance value of the capacitance sensing device is recorded at intervals, the interval recording time is T1, and the number of recordings is k. When recording the capacitance value of the capacitance sensing device at intervals, when the number of overflows recorded by the chip of the capacitance sensing device is 1, the interval recording time is T1, and when the absolute value of A1-A0 is greater than the program setting value m1 for k consecutive times, the continuous k times is to avoid false detections such as non-overflowing food or user wiping, and the product of the interval recording time T1 and the number of recordings k is the continuous time length t k , the heating coil power is reduced to p1% of the original set power.
[0010] The present invention is further configured as follows: in step 200, the capacitance value of the capacitance sensing device is recorded continuously in real time. When the capacitance value of the capacitance sensing device is recorded continuously in real time, the absolute value of A1-A0 is recorded continuously in t k When the duration is greater than the program setting value m1, continuous t k The duration is to avoid false detections such as food spilling or being wiped by the user. The heating coil power is reduced to p1% of the original set power.
[0011] The present invention is further configured as follows: the capacitive sensing device is a capacitive sensing ring of an annular structure, and the capacitive sensing ring is sleeved outside the heating coil. The capacitive sensing ring forms a capacitor with the panel and the pot on its surface. The capacitance generated by the capacitive sensing ring and different materials is different. The touch chip detects the capacitance value (threshold) of the capacitive sensing ring. When water overflows onto the panel, the threshold is different, and thus it is determined whether water overflows according to different thresholds. Since the pot is generally aligned with the heating coil during heating, the capacitive sensing ring is sleeved outside the heating coil, and the pot is also aligned with the capacitive sensing ring.
[0012] The present invention is further configured as follows: the electromagnetic cooker further comprises a pot placed above the panel and facing the heating coil, the inner diameter of the capacitive induction ring is d1, the bottom diameter of the pot is d2, and d1-d2≥5mm. The inner diameter of the capacitive induction ring is larger than the bottom diameter of the pot, ensuring that water overflowing from the pot falls within the sensing range of the capacitive induction ring, thereby ensuring recognition stability. Furthermore, the inner diameter of the capacitive induction ring is larger than the bottom diameter of the pot by more than 5mm, ensuring that water overflowing from the pot splashes onto the panel, and the splashing area is slightly larger than the size of the pot, but still falls within the sensing range of the capacitive induction ring, thereby ensuring recognition stability.
[0013] The present invention is further configured as follows: the number of the heating furnaces is multiple, and the multiple heating furnaces are arranged side by side. Through this configuration, the multi-mouth induction cooker has multiple heating furnaces, which can hold multiple pots, and each heating furnace is controlled separately, so that multi-threaded cooking can be performed simultaneously without affecting each other.
[0014] The present invention is further configured as follows: the capacitive sensing device in each heating furnace is electrically connected to the control circuit board respectively, and when any one of the heating furnaces is started, the capacitive sensing devices in the other heating furnaces are in a detection state. Through this configuration, the capacitive sensing device in each heating furnace detects the capacitance value respectively. When the size of the pot is smaller than the inner diameter of the capacitive sensing ring, the water overflowing from the pot falls within the sensing range of the capacitive sensing ring, ensuring the recognition stability; when the size of the pot is larger than the inner diameter of the capacitive sensing ring, the water overflowing from one of the pots falls outside the sensing range of the corresponding capacitive sensing ring. At this time, if the other capacitive sensing devices do not work, it is impossible to detect whether there is overflow. When the capacitive sensing devices in the other heating furnaces are still in the detection state, the water overflowing from the corresponding pot falls within the sensing range of other capacitive sensing rings, and it is still possible to detect whether there is overflow, thereby expanding the scope of application, not limiting the bottom diameter of the pot, and ensuring the recognition stability.
[0015] The present invention is further configured as follows: during the use of the electromagnetic cooker, the capacitance sensing device in each heating furnace executes an overflow detection program, and when the capacitance sensing device in any heating furnace detects overflow, the heating coils in all heating furnaces reduce their power. Through this configuration, the capacitance sensing device in each heating furnace respectively executes an overflow detection program. When the size of the pot is smaller than the inner diameter of the capacitance sensing ring, the capacitance sensing device in the heating furnace detects overflow, and the heating coils in the heating furnace reduce their power; when the size of the pot is larger than the inner diameter of the capacitance sensing ring, the water overflowing from one of the pots falls outside the sensing range of the corresponding capacitance sensing ring, while the other capacitance sensing rings can sense it. At this time, if the heating furnace that senses overflow is executed by the overflow detection program alone, its power is reduced or it is made not to work, the heating furnace that actually overflows continues to work, and cannot effectively prevent overflow. When the capacitance sensing device in any heating furnace detects overflow, the heating coils in all heating furnaces reduce their power, expanding the scope of application, and can effectively prevent water overflow in the pot without limiting the bottom diameter of the pot.
[0016] The advantages of the present invention are: (1) by detecting overflow multiple times, false detection is prevented and the heating power is adjusted; (2) the electromagnetic cooker has at least two heating furnaces, each of which detects whether there is overflow on the panel through its own capacitance sensing device. When there is no overflow on the panel and when there is overflow on the panel, the capacitance generated by the capacitance sensing device and the panel it is in close contact with is different. The capacitance value of the capacitance sensing device during the cooking process is detected and recorded. The capacitance sensing device is connected to the control circuit board through a wire, and the control circuit board is used to adjust the power of the heating coil; (3) the capacitance sensing device in each heating furnace detects the capacitance value separately. When the size of the pot is smaller than the inner diameter of the capacitive sensing ring, water overflowing from the pot falls within the sensing range of the capacitive sensing ring, thereby ensuring recognition stability; when the size of the pot is larger than the inner diameter of the capacitive sensing ring, water overflowing from one of the pots falls outside the sensing range of the corresponding capacitive sensing ring. At this time, if other capacitive sensing devices do not work, it is impossible to detect whether there is overflow. However, when the capacitive sensing devices in the remaining heating furnaces are still in the detection state, water overflowing from the corresponding pot falls within the sensing range of other capacitive sensing rings, thereby still being able to detect whether there is overflow, thereby expanding the scope of application, not limiting the bottom diameter of the pot, and ensuring recognition stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is an axonometric diagram of a capacitive sensing device in the present invention; Figure 3 is a top view of the capacitive sensing device of the present invention; Figure 4 yes Figure 3 Sectional view at AA in the middle; Figure 5 yes Figure 4 Enlarged view of point B in the middle.
[0018] Reference numerals: housing 100 , panel 200 , control circuit board 300 , heating furnace 400 , heating coil 410 , capacitive sensing device 420 , capacitive sensing ring 421 , folded edge 422 . DETAILED DESCRIPTION
[0019] In the description of this embodiment, it should be noted that if the terms "center", "upper", "lower", "left", "right", "longitudinal", "lateral", "side" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore, cannot be understood as limiting the present invention. In addition, if the terms "first", "second", and "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0021] Embodiment 1: Reference Figures 1 to 5 An electromagnetic cooker includes a shell 100, a panel 200, a control circuit board 300 and at least two heating furnaces 400. The heating furnace 400 includes a heating coil 410 and a capacitive sensing device 420 for detecting overflow from the panel 200. The capacitive sensing device 420 is closely attached to the lower surface of the panel 200. The heating coil 410 and the capacitive sensing device 420 are both electrically connected to the control circuit board 300.
[0022] In the above technical solution, the electromagnetic cooker has at least two heating furnaces 400, each heating furnace 400 detects whether there is overflow on the panel 200 through its own capacitance sensing device 420. When there is no overflow on the panel 200 and when there is overflow, the capacitance generated by the capacitance sensing device 420 and the panel 200 closely attached thereto is different. The capacitance value of the capacitance sensing device 420 during cooking is detected and recorded. The capacitance sensing device 420 is connected to the control circuit board 300 through a wire, and the control circuit board 300 is used to adjust the power of the heating coil 410. When the capacitance value measured at intervals is greater than the set value for a certain number of consecutive times or when the capacitance value measured in real time is greater than the set value for a period of time, it is reported that there is water overflow, and the control circuit board 300 is used to control the heating coil 410 to reduce the power or stop the electromagnetic cooker. The capacitance sensing device 420 is located on the lower surface of the panel 200 and does not directly contact the pot, so the capacitance sensing device 420 will not cause wear problems.
[0023] At startup, the chip records the capacitance value (threshold) of the capacitive induction ring 421, the panel 200 and the cookware, recorded as A1; during the cooking process, the chip records the capacitance value (threshold) of the capacitive induction ring 421, the panel 200 and the cookware, recorded as A2. When the absolute value of A2-A1 is greater than the program setting value m, an overflow is reported, and the control circuit board 300 is used to control the heating coil 410 to reduce the power or stop the induction cooker.
[0024] It can be understood that in order to prevent interference such as false touch: the absolute value of A2-A1 is measured at intervals for multiple times. When the absolute value of A2-A1 is greater than the set value m for a certain number of consecutive times, an overflow is reported, and the control circuit board 300 is used to control the heating coil 410 to reduce the power or stop the induction cooker; or, the absolute value of A2-A1 is measured in real time. When the absolute value of A2-A1 is greater than the set value m for a period of time, an overflow is reported, and the control circuit board 300 is used to control the heating coil 410 to reduce the power or stop the induction cooker.
[0025] Among them, reference Figure 2 In order to facilitate the determination of whether water has overflowed, the capacitive sensing device 420 is a capacitive sensing ring 421 of an annular structure, and the capacitive sensing ring 421 is sleeved on the outside of the heating coil 410. The capacitive sensing ring 421 forms a capacitor with the panel and the pot on its surface. The capacitance generated by the capacitive sensing ring 421 and different materials are different. The touch chip detects the capacitance value (threshold) of the capacitive sensing ring 421. When water overflows onto the panel 200, the threshold is different, so whether water has overflowed is determined based on different thresholds. In the prior art, metal ink is printed on the surface of the panel. When used, the pot contacts the ink, and the ink is easily worn out. In addition, it contacts the high-temperature pot, which affects the detection effect.
[0026] Among them, reference Figure 2 In order to effectively solve the EMF problem, a folded edge 422 extending downward is provided on the outer side of the capacitive induction ring 421. The folded edge on the side of the outer side of the capacitive induction ring 421 close to the heating coil 410 can be used as a reflector to effectively shield the electromagnetic field generated by the heating coil 410, prevent the human body from being in a high-dose electromagnetic radiation environment, reduce the adverse effects on the human body, ensure personal safety, and effectively solve the EMF problem.
[0027] Among them, reference Figure 1 , Figure 2 In order to further effectively solve the EMF problem, the lower end surface of the folded edge 422 is lower than the lower end surface of the heating coil 410. The heating coil 410 is located in the capacitive induction ring 421 in the up and down directions, which can completely reflect the electromagnetic field generated by the heating coil 410, effectively shield the electromagnetic field generated by the heating coil 410, prevent the human body from being in a high-dose electromagnetic radiation environment, reduce the adverse effects on the human body, ensure personal safety, and effectively solve the EMF problem.
[0028] Among them, reference Figure 1 , in order to ensure the stability of recognition, the pot is placed above the panel 200 and facing the heating coil 410, the inner diameter of the capacitive induction ring 421 is d1, the bottom diameter of the pot is d2, and d1-d2≥5mm. The inner diameter of the capacitive induction ring 421 is larger than the bottom diameter of the pot, ensuring that the water overflowing from the pot falls within the sensing range of the capacitive induction ring, thereby ensuring the stability of recognition. Furthermore, the inner diameter of the capacitive induction ring 421 is larger than the bottom diameter of the pot by more than 5mm, ensuring that the water overflowing from the pot splashes onto the panel, and the splashing area is slightly larger than the size of the pot, but still falls within the sensing range of the capacitive induction ring 421, thereby ensuring the stability of recognition.
[0029] Among them, reference Figure 1 , also to ensure recognition stability, the effective contact width between the capacitive sensing device 420 and the lower surface of the panel 200 is not less than 1.5 mm. Ensuring the effective contact area between the capacitive sensing device 420 and the panel 200 facilitates the measurement of the capacitance value generated by the capacitive sensing device 420 and the panel 200 it is in close contact with, and the touch chip detects the capacitance value (threshold) of the capacitive sensing ring more accurately, ensuring recognition stability.
[0030] In order to cook two threads at the same time without affecting each other, there are two heating furnaces 400, and the two heating furnaces 400 are arranged side by side. The double-mouth induction cooker has two heating furnaces 400, which can hold two pots. The heating furnaces 400 on both sides are controlled separately, so that cooking two threads can be carried out at the same time without affecting each other.
[0031] In order to expand the scope of application, the capacitive sensing device 420 in each heating furnace 400 is electrically connected to the control circuit board 300, and when any one heating furnace 400 is started, the capacitive sensing devices 420 in the other heating furnaces 400 are in a detection state. The capacitive sensing device 420 in each heating furnace detects the capacitance value respectively. When the size of the pot is smaller than the inner diameter of the capacitive sensing ring 421, the water overflowing from the pot falls within the sensing range of the capacitive sensing ring 421, ensuring the recognition stability; when the size of the pot is larger than the inner diameter of the capacitive sensing ring 421, the water overflowing from one of the pots falls outside the sensing range of the corresponding capacitive sensing ring 421. At this time, if the other capacitive sensing devices 420 do not work, it is impossible to detect whether there is overflow. When the capacitive sensing devices 420 in the other heating furnaces 400 are still in the detection state, the water overflowing from the corresponding pot falls within the sensing range of other capacitive sensing rings 421, and it is still possible to detect whether there is overflow, expanding the scope of application and ensuring the recognition stability.
[0032] The panel 200 is made of ceramic. The panel is made of ceramic material, which has high rigidity and hardness and is not easily damaged by the collision of the pot; it has low thermal conductivity and can insulate the heat generated by the heating coil.
[0033] Embodiment 2: Reference Figures 1 to 5 Based on the first embodiment, a method for detecting overflow of an electromagnetic cooker includes the following steps: Step 100: start the electromagnetic cooker and record the capacitance value of the capacitance sensing device 420 as the background noise value A0; Step 200: During the cooking process, the capacitance value of the capacitance sensing device 420 is recorded as A1; Step 300: When the absolute value of A1-A0 is continuously k When the duration is greater than the program setting value m1, the power of the heating coil 410 is reduced to p1% of the original setting power; Step 400: The number of chip cumulative overflows is recorded as n; Step 500: During the cooking process, continue to record the capacitance value of the capacitive sensing device, recorded as A n+1 , Step 600: When A n+1 -A n The absolute value of the continuous t k The duration is greater than the program setting value m n+1 When the heating coil power is reduced to p of the original set power n+1 %,p n+1 <p n ; Step 700: Repeat steps 400 to 600. When n in step 600 is greater than the set value z, stop working and report overflow.
[0034] In the above technical solution, the capacitive sensing device 420 of the electromagnetic cooker detects whether there is spillage on the panel 200. The capacitance generated by the capacitive sensing device 420 and the panel 200 closely attached thereto is different when there is no spillage on the panel 200 and when there is spillage on the panel 200. The capacitance value of the capacitive sensing device 420 during the cooking process is detected and recorded. The capacitive sensing device 420 is connected to the control circuit board 300 through a wire, and the control circuit board 300 is used to adjust the power of the heating coil 410. When the electromagnetic cooker is started, the capacitance value of the capacitive sensing device 420 is recorded and recorded as the background noise value A0. The background noise value A0 is filtered to avoid noise interference, that is, after the electromagnetic cooker is started, the capacitance value is recorded, and the capacitance value data with large or small values is removed and is not used as data to participate in the average value calculation (the data range of different pots and prepared materials needs to be tested as a reference value, and the data beyond the range is not recorded), and then the remaining front t is taken. sDuring the cooking process, the capacitance value of the capacitance sensing device 420 is recorded at intervals or in real time, and is recorded as A1.
[0035] When recording the capacitance value of the capacitance sensing device 420 at intervals, when the chip of the capacitance sensing device records the overflow number once, the interval recording time is T1, and the number of recordings is k. When the absolute value of A1-A0 is greater than the program setting value m1 for k consecutive times, the continuous k times is to avoid false detections such as food not overflowing or being wiped by the user, and the product of the interval recording time T1 and the number of recordings k is the continuous time length t k , the continuous duration of the record is t k A value in the range of 0.1s-5s is selected, and the power of the heating coil 410 is reduced to p1% of the original set power.
[0036] When the capacitance value of the capacitance sensing device 420 is recorded in real time, when the absolute value of A1-A0 is continuously t k When the duration is greater than the program setting value m1, continuous t k The duration is to avoid false detections such as food spilling or user wiping. The continuous duration t is recorded. k At a value within the range of 0.1s-5s, the power of the heating coil 410 is reduced to p1% of the original set power.
[0037] Repeat the above steps 400 to 600, and record the capacitance value of the capacitance sensing device at intervals, which is recorded as A n , the number of times the chip records overflow is recorded as n. When n = 1, the interval recording time is T1. When the absolute value of A1-A0 is greater than the program setting value m1 for k consecutive times, where the consecutive k times is to avoid false triggering by noise, the product of the interval recording time T1 and the number of recording times k is the continuous time length t k , the continuous duration of the record is t k When the heating coil power is reduced to p1% of the original set power, the chip records the overflow times as n=1. n+1 -A n The absolute value of is greater than the program setting value m for k consecutive times n+1 The heating coil power is reduced to p of the original set power for k consecutive times to avoid false triggering due to noise. n+1 , the last reduction of the heating coil power is based on the previous reduction of the heating coil power, so p n+1 <p n , and when m is greater than the set value z, it stops working and reports water overflow. When the error is ignored, m n+1 = m1; Considering that the capacitance changes the most during the first overflow, m n+1 <m n .
[0038] Preferably, the continuous duration of the recording is t k Select a value in the range of 0.6s-2s.
[0039] Preferably, the setting value z is 800-1500, and the original setting power p n % is 50%, and k is 40-60 times.
[0040] Among them, when k = 1, A n+1 -A n The absolute value of is greater than the program setting value m n+1 When the cooking food is not spilled or wiped by the user, the false detection is ignored, and the program is simplified. The chip records the number of overflows as n, and the power of the heating coil 410 is reduced to p of the original set power. n %, when m is greater than the set value z, it stops working and reports water overflow.
[0041] Among them, when k ≥ 2, A n+1 -A n The absolute value of is greater than the program setting value m for k consecutive times n+1 In this way, it is possible to avoid the situation where the food does not overflow or is wiped by the user, and the chip records the number of overflows as n, that is, the power of the heating coil 410 is reduced to p of the original set power. n %, when m is greater than the set value z, it stops working and reports water overflow.
[0042] During the use of the electromagnetic cooker, the capacitive sensing device 420 in each heating furnace 400 performs an overflow detection program. When the capacitive sensing device 420 in any heating furnace 400 detects overflow, the heating coils 410 in all heating furnaces 400 reduce their power. The capacitive sensing device 420 in each heating furnace 400 performs an overflow detection program respectively. When the size of the pot is smaller than the inner diameter of the capacitive sensing ring 421, the capacitive sensing device 420 in the heating furnace 400 detects overflow, and the heating coils 410 in the heating furnace 400 reduce their power; when the size of the pot is larger than the inner diameter of the capacitive sensing ring 421, the water overflowing from one of the pots falls outside the sensing range of the corresponding capacitive sensing ring 421, while the other capacitive sensing rings 421 can sense it. At this time, if the heating furnace 400 that senses overflow is executed by the overflow detection program alone, its power is reduced or it is stopped, the heating furnace 400 that actually overflows will continue to work, and the function of effectively preventing overflow cannot be achieved. When the capacitive sensing device 420 in any heating furnace 400 detects overflow, the heating coils 410 in all heating furnaces 400 will reduce their power, thereby expanding the scope of application, not limiting the bottom diameter of the pot, and effectively preventing water in the pot from overflowing.
[0043] The specific description of the present invention in the above embodiments is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technical engineers in this field may make some non-essential improvements and adjustments to the present invention based on the contents of the above invention, which fall within the scope of protection of the present invention.
Claims
1. A method for detecting overflow from an electromagnetic cooker, the electromagnetic cooker comprising a housing, a panel, a control circuit board and a heating furnace arranged below the panel, the heating furnace comprising a heating coil and a capacitive sensing device for detecting overflow from the panel, the heating coil and the capacitive sensing device being electrically connected to the control circuit board, wherein: The overflow detection method comprises the following steps: Step 100: Start the electromagnetic cooker and record the capacitance value of the capacitance sensing device as the background noise value A0; Step 200: During the cooking process, the capacitance value of the capacitive sensing device is recorded as A1; Step 300: When the absolute value of A1-A0 is continuously k When the duration is greater than the program setting value m1, the heating coil power is reduced to p1% of the original setting power.
2. The electromagnetic cooker overflow detection method according to claim 1, characterized in that: Step 300 also includes the following steps: Step 400: The number of chip cumulative overflows is recorded as n; Step 500: During the cooking process, continue to record the capacitance value of the capacitance sensing device, recorded as A n+1 , Step 600: When A n+1 -A n The absolute value of the continuous t k The duration is greater than the program setting value m n+1 When the heating coil power is reduced to p of the original set power n+1 %,p n+1 <p n ; Step 700: Repeat steps 400 to 600. When n in step 600 is greater than the set value z, stop working and report overflow.
3. The electromagnetic cooker overflow detection method according to claim 1 or 2, characterized in that: In step 100, the background noise value A0 is the value before t after the electromagnetic cooker is started. s The average value of capacitance over time.
4. The electromagnetic cooker overflow detection method according to claim 1 or 2, characterized in that: In step 200, the capacitance value of the capacitance sensing device is recorded at intervals, the interval recording time is T1, and the number of recording times is k.
5. The electromagnetic cooker overflow detection method according to claim 1 or 2, characterized in that: In step 200, the capacitance value of the capacitive sensing device is recorded continuously in real time.
6. The electromagnetic cooker overflow detection method according to claim 1 or 2, characterized in that: The capacitive induction device is a capacitive induction ring with an annular structure, and the capacitive induction ring is sleeved on the outside of the heating coil.
7. The electromagnetic cooker overflow detection method according to claim 6, characterized in that: The electromagnetic cooker also includes a pot placed above the panel and facing the heating coil, the inner diameter of the capacitive induction ring is d1, the bottom diameter of the pot is d2, and d1-d2≥5mm.
8. The electromagnetic cooker overflow detection method according to claim 1 or 2, characterized in that: There are multiple heating furnaces, which are arranged side by side.
9. The electromagnetic cooker overflow detection method according to claim 8, characterized in that: The capacitive sensing device in each heating furnace is electrically connected to the control circuit board respectively, and when any one of the heating furnaces is started, the capacitive sensing devices in the other heating furnaces are in a detection state.
10. The electromagnetic cooker overflow detection method according to claim 8, characterized in that: During the use of the electromagnetic cooker, the capacitance sensing device in each heating furnace executes an overflow detection program. When the capacitance sensing device in any heating furnace detects overflow, the heating coils in all heating furnaces reduce their power.