Heating kettle and water level detection system thereof

Abstract

The utility model discloses a heating kettle and a water level detection system thereof, relates to the technical field of intelligent household appliances, and aims to solve the technical problems of high manufacturing cost, troublesome modification and the like of the heating kettle caused by adding a water level detection piece in the prior art. The heating kettle is provided with a water containing cavity. The water level detection system comprises a first water level detection electrode, a second water level detection electrode and a main control chip. Wherein the first water level detection electrode and the second water level detection electrode are both arranged on the inner wall of the water containing cavity, and the height, relative to the bottom face of the water containing cavity, of the detection end of the second water level detection electrode is larger than the height, relative to the bottom face of the water containing cavity, of the detection end of the first water level detection electrode; the first water level detection electrode and the second water level detection electrode are both electrically connected with a first pin of the main control chip, and the main control chip has the functions of detecting the voltage value of the first pin and generating water level information according to the voltage value. Therefore, the method has the advantages of being high in universality, saving cost and being convenient to change.

Description

Technical Field

[0001] The present application relates to the technical field of smart home appliances, and in particular to a heating kettle and a water level detection system thereof. Background Art

[0002] In existing products, the water level detection electrodes set in the water holding cavity of the kettle and the signal input pins of the main control chip are usually in a one-to-one correspondence. When the liquid level in the water holding cavity exceeds a certain water level detection electrode, the branch where the water level detection electrode is located is turned on or off, and the main control chip generates liquid level information based on the level signal change caused by the branch being turned on or off. Therefore, the number of pins of the main control chip is closely related to the number of water level detection electrodes. If the technician wants to temporarily add water level detection electrodes, that is, when the number of water level detection electrodes increases to multiple, the main control chip needs multiple signal input pins to support water level detection, which may increase the cost of the main control chip or require changing the pin connection method of the main control chip.

[0003] In addition, the kettle body and base of the kettle are usually connected through a coupler to transmit power, detection signals and control signals. The number of access terminals of the upper coupler is closely related to the number of electrical devices installed on the kettle body. Taking water level detection as an example, the water-containing cavity has a built-in water level detection electrode, and one water level detection electrode is electrically connected to an access terminal of the upper coupler. At present, six-core couplers (for example, a coupler with six access terminals) are generally used in kettle products. In addition to grounding, temperature detection, and heating control, only one water level detection electrode is supported in the kettle body, which cannot meet the multiple water level detection requirements of the kettle (for example, detecting water shortage and full water at the same time, or more liquid levels). The use of couplers with more access terminals will also increase the production cost of the kettle. Utility Model Content

[0004] The purpose of the present application is to provide a heating kettle and a water level detection system thereof, which can generate water level information based on the voltage value detected at the same pin of a main control chip by connecting multiple water level detection electrodes to the pin. Therefore, the present application has the advantages of strong versatility, cost saving, easy modification, and meeting multiple water level detection needs.

[0005] The embodiment of the present application is implemented as follows:

[0006] The first aspect of the embodiment of the present application provides a water level detection system for a heating kettle, the heating kettle has a water-containing cavity, and the water level detection system includes: a first water level detection electrode, a second water level detection electrode, and a main control chip. The first water level detection electrode and the second water level detection electrode are both arranged on the inner wall of the water-containing cavity, and the height of the detection end of the second water level detection electrode relative to the bottom surface of the water-containing cavity is greater than the height of the detection end of the first water level detection electrode relative to the bottom surface of the water-containing cavity; the first water level detection electrode and the second water level detection electrode are both electrically connected to the first pin of the main control chip, and the main control chip has the function of detecting the voltage value at the first pin and generating water level information according to the voltage value.

[0007] In one embodiment, the water level detection system of the heating kettle also includes a first compensation resistor, one end of the first compensation resistor is connected to one end of the second water level detection electrode, and the other end of the first compensation resistor is connected to the first pin; the first water level detection electrode is connected in parallel with the first compensation resistor and the second water level detection electrode, and one end of the first water level detection electrode is connected to the first pin, and the other end of the first water level detection electrode is grounded.

[0008] In one embodiment, the water level detection system of the heating kettle further includes a current limiting resistor, one end of which is connected to the power supply module, and the other end of which is connected to the first pin and the first water level detection electrode.

[0009] In one embodiment, the water level detection system of the heating kettle further includes a first capacitor, which is connected in parallel with the first water level detection electrode, one end of the first capacitor is connected to the first pin, and the other end of the first capacitor is grounded.

[0010] In one embodiment, the water level detection system of the heating kettle also includes at least one supplementary water level detection electrode, which are all arranged inside the water containing cavity. The detection ends of the first water level detection electrode, the second water level detection electrode and all the supplementary water level detection electrodes are located at different heights compared to the bottom surface of the water containing cavity; the first water level detection electrode, the second water level detection electrode and all the supplementary water level detection electrodes are electrically connected to the first pin of the main control chip.

[0011] In one embodiment, the water level detection system of the heating kettle also includes at least one threshold compensation resistor, one threshold compensation resistor is connected in series with a supplementary water level detection electrode, one end of the threshold compensation resistor is connected to the first pin; the first water level detection electrode is connected in parallel with the series-connected threshold compensation resistor and the supplementary water level detection electrode.

[0012] A second aspect of the embodiments of the present application provides a heating kettle, which includes the water level detection system for the heating kettle provided by any embodiment of the first aspect of the present application.

[0013] In one embodiment, the heating kettle includes a cup body and a handle, the interior of the cup body has a water holding cavity, both ends of the handle are connected to the cup body, and the interior of the handle has a holding line hole passing through both ends; the first water level detection electrode is arranged at the connection between one end of the handle and the cup body, and the second water level detection electrode is arranged at the connection between the other end of the handle and the cup body, and the first water level detection electrode and the second water level detection electrode are electrically connected through a connecting wire in the holding line hole.

[0014] In one embodiment, the heating kettle also includes a coupler having a first input end and a first output end that can be electrically connected, the first water level detection electrode and the second water level detection electrode are both electrically connected to the first input end, and the first pin is electrically connected to the first output end.

[0015] In one embodiment, the heating kettle also includes: a heating plate and / or an NTC detection component, the two power supply terminals of the heating plate are electrically connected to the second access terminal and the third access terminal of the coupler respectively, and the fourth access terminal of the coupler is grounded; the NTC detection component is electrically connected to the fifth access terminal and the sixth access terminal of the coupler.

[0016] The beneficial effects of this application compared with the prior art are:

[0017] The present application can solve the problems of increased manufacturing cost and difficulty in modification caused by the limited number of pins of the main control chip or the access terminals of the coupler when the existing heating kettle is provided with multiple water level detection parts or additional water level detection parts are added. The heating kettle and its water level detection system provided by the present application connect multiple water level detection electrodes to the same pin of the main control chip, and determine the water level information based on the voltage value at the pin detected by the main control chip. Therefore, the present application can realize the setting or adding of water level detection parts at any height in the water-containing cavity of the heating kettle, without replacing the main control chip and coupler configured in the heating kettle. It has strong versatility and wide application range, and when adding or deleting water level detection parts in the future, there is no need to excessively change the original circuit, and only the voltage comparison threshold of the main control chip needs to be appropriately adjusted to realize water level detection. The present application has the advantages of wide application range, cost saving, and convenient addition, deletion and modification of water level detection parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of a heating kettle shown in one embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the structure of a dual water level detection circuit according to an embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of the structure of a multi-water level detection circuit shown in an embodiment of the present application;

[0022] Figure 4 This is a schematic diagram of the structure of a low water level detection equivalent circuit shown in an embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of the structure of a high water level detection equivalent circuit shown in an embodiment of the present application;

[0024] Figure 6 This is a schematic diagram of the structure of a multi-water level detection equivalent circuit shown in an embodiment of the present application.

[0025] Icons: 1-heating kettle; 11-cup body; 110-water holding cavity; 12-handle; 121-wire holding hole; 13-base; 2-water level detection system; 21-main control chip; 211-first pin; 201-first water level detection electrode; 202-second water level detection electrode; 203-supplementary water level detection electrode; 212-first compensation resistor; 213-threshold compensation resistor; 22-current limiting resistor; 23-first capacitor; 24-connecting wire; 3-coupler; 31-first coupler; 311-first access terminal; 312-second access terminal; 313-fifth access terminal; 314-sixth access terminal; 315-fourth access terminal; 316-third access terminal; 32-second coupler; 321-first output terminal; 4-heating plate; 5-NTC detection component. DETAILED DESCRIPTION

[0026] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0027] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the products of the present application are usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0029] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0030] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0031] See also Figure 1 , Figure 1 FIG. 1 is a schematic diagram of the structure of a heating kettle 1 according to an embodiment of the present application. Figure 1 As shown, the heating kettle 1 comprises a water level detection system 2, a cup body 11 and a base 13. The cup body 11 has a water containing cavity 110 inside, and the cup body 11 is placed on the top surface of the base 13.

[0032] Specifically, the water level detection system 2 of the heating kettle 1 includes: a first water level detection electrode 201, a second water level detection electrode 202 and a main control chip 21. The first water level detection electrode 201 and the second water level detection electrode 202 are both arranged on the inner wall of the water containing cavity 110, and the height h2 of the detection end of the second water level detection electrode 202 (the bottom end of the second water level detection electrode 202) relative to the bottom surface of the water containing cavity 110 is greater than the height h1 of the detection end of the first water level detection electrode 201 (the bottom end of the first water level detection electrode 201) relative to the bottom surface of the water containing cavity 110; the main control chip 21 is arranged in the base 13, and the first water level detection electrode 201 and the second water level detection electrode 202 are both electrically connected to the first pin 211 of the main control chip 21, and the main control chip 21 has the function of detecting the voltage value at the first pin 211 and generating water level information according to the voltage value.

[0033] Based on the above scheme, the heating kettle 1 and its water level detection system 2 provided by the present application can realize setting or adding a water level detection part at any height position in the water-containing cavity 110 of the heating kettle 1, without replacing the main control chip 21 and the coupler 3 configured in the heating kettle 1. It has strong versatility and a wide range of applications. When adding or deleting water level detection parts in the future, there is no need to change the original circuit on a large scale. It is only necessary to appropriately adjust the voltage comparison threshold (voltage comparison interval) of the main control chip 21 to realize water level detection. The present application has the advantages of a wide range of applications, cost savings, and convenient addition, deletion and modification of water level detection parts.

[0034] In one embodiment, a handle 12 is provided on one side of the cup body 11, and both ends of the handle 12 are connected to the side wall of the cup body 11, and the handle 12 has a wire hole 121 passing through both ends. The first water level detection electrode 201 is provided at the connection between one end of the handle 12 and the cup body 11, and the second water level detection electrode 202 is provided at the connection between the other end of the handle 12 and the cup body 11, and the first water level detection electrode 201 and the second water level detection electrode 202 are electrically connected through the connection line 24 in the wire hole 121.

[0035] In one embodiment, the heating kettle 1 further includes a coupler 3, and the coupler 3 includes a first coupler 31 and a second coupler 32 that match each other. The first coupler 31 is arranged at the bottom end of the cup body 11, and the second coupler 32 is arranged at the top end of the base 13. The coupler 3 has a first access end 311 and a first output end 321 that can be electrically connected, the first access end 311 is arranged at the first coupler 31, and the first output end 321 is arranged at the second coupler 32. When the cup body 11 is placed on the top surface of the base 13, the first coupler 31 and the second coupler 32 can be electrically connected, thereby realizing the electrical connection between the first access end 311 and the first output end 321. The first water level detection electrode 201 and the second water level detection electrode 202 are both electrically connected to the first access end 311, and the first pin 211 of the main control chip 21 is electrically connected to the first output end 321. Thus, the first water level detection electrode 201 and the second water level detection electrode 202 are electrically connected to the first pin 211 of the main control chip 21 through the docking of the coupler 3 .

[0036] In one embodiment, the heating kettle 1 further comprises: a heating plate 4 and / or an NTC detection element 5. Figure 1 As shown, the heating kettle 1 includes a heating plate 4 and an NTC detector 5. The NTC detector 5 is arranged at the bottom of the cup body 11, and one end of the NTC detector 5 extends into the water-containing cavity 110, and the NTC detector 5 is configured to detect the water temperature in the water-containing cavity 110; the heating plate 4 is arranged at the bottom of the cup body 11 and isolated from the water-containing cavity 110, and the heating plate 4 is configured to heat the liquid in the water-containing cavity 110. Specifically, the two power supply ends of the heating plate 4 are electrically connected to the second access end 312 and the third access end 316 of the coupler 3, respectively, and the fourth access end 315 of the coupler 3 is grounded; the NTC detector 5 is electrically connected to the fifth access end 313 and the sixth access end 314 of the coupler 3.

[0037] See also Figure 2 , Figure 2This is a schematic diagram of the structure of a dual water level detection circuit according to an embodiment of the present application. When the first coupler 31 is electrically connected to the second coupler 32, that is, when all water level detection electrodes in the water containing cavity 110 can be electrically connected to the first pin 211 of the main control chip 21, the water level detection system 2 of the heating kettle 1 can be embodied in the form of a water level detection circuit. Figure 2 As shown, the water level detection system 2 of the heating kettle 1 includes a first water level detection electrode 201 and a second water level detection electrode 202, which is embodied in the form of a dual water level detection circuit.

[0038] In one embodiment, the water level detection system 2 of the heating kettle 1 further includes a first compensation resistor 212. One end of the first compensation resistor 212 is connected to one end of the second water level detection electrode 202, the other end of the first compensation resistor 212 is connected to the first pin 211, and the other end of the second water level detection electrode 202 is grounded; one end of the first water level detection electrode 201 is connected to the first pin 211, and the other end of the first water level detection electrode 201 is grounded. That is, the branch where the first water level detection electrode 201 is located is connected in parallel with the branch where the first compensation resistor 212 and the second water level detection electrode 202 are connected in series.

[0039] In one embodiment, the water level detection system 2 of the heating kettle 1 also includes a current limiting resistor 22, one end of the current limiting resistor 22 is connected to the power supply module (VCC), and the other end of the current limiting resistor 22 is connected to the first pin 211, the first water level detection electrode 201, and the first compensation resistor 212.

[0040] In one embodiment, the water level detection system 2 of the heating kettle 1 further includes a first capacitor 23, the first capacitor 23 is connected in parallel with the first water level detection electrode 201, one end of the first capacitor 23 is connected to the first pin 211, and the other end of the first capacitor 23 is grounded. The first capacitor 23 is configured to filter and resist interference, so that the voltage value detected by the main control chip 21 at the first pin 211 is more accurate.

[0041] See also Figure 3 , Figure 3 FIG. 1 is a schematic diagram of a multi-water level detection circuit according to an embodiment of the present application. Figure 3 As shown, when the first coupler 31 and the second coupler 32 are electrically connected, that is, when all water level detection electrodes in the water containing cavity 110 can be electrically connected to the first pin 211 of the main control chip 21, the water level detection system 2 of the heating kettle 1 can be embodied in the form of a water level detection circuit. Figure 3 As shown, the water level detection system 2 of the heating kettle 1 includes a first water level detection electrode 201, a second water level detection electrode 202 and at least one supplementary water level detection electrode 203, which is embodied in the form of a multi-water level detection circuit.

[0042] In one embodiment, each supplementary water level detection electrode 203 is disposed inside the water containing cavity 110, and the detection end of the first water level detection electrode 201, the detection end of the second water level detection electrode 202 and the detection end of each supplementary water level detection electrode 203 are located at different heights compared to the bottom surface of the water containing cavity 110; the first water level detection electrode 201, the second water level detection electrode 202 and all the supplementary water level detection electrodes 203 are electrically connected to the first pin 211 of the main control chip 21.

[0043] In one embodiment, the water level detection system 2 of the heating kettle 1 further includes at least one threshold compensation resistor 213, and one threshold compensation resistor 213 is connected in series with one supplementary water level detection electrode 203. One end of the threshold compensation resistor 213 is connected to the first pin 211, and the other end of the threshold compensation resistor 213 is connected to one end of one supplementary water level detection electrode 203, and the other end of each supplementary water level detection electrode 203 is grounded; the branch where the first water level detection electrode 201 is located is connected in parallel with the supplementary detection branch where multiple groups of threshold compensation resistors 213 and supplementary water level detection electrodes 203 are connected in series, and each group of supplementary detection branches is a branch obtained by connecting one threshold compensation resistor 213 and one supplementary water level detection electrode 203 in series.

[0044] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of the low water level detection equivalent circuit shown in an embodiment of the present application. Figures 1 to 4 As shown, when the water in the water-containing cavity 110 just covers the first water level detection electrode 201 at the lowest height, the water level in the water-containing cavity 110 is at a low water level. At this time, the first water level detection electrode 201 can detect water, but the second water level detection electrode 202 or the supplementary water level detection electrode 203 cannot detect water. The detection branches where the second water level detection electrode 202 and the supplementary water level detection electrode 203 are located are equivalent to open circuits. The water between the detection end of the first water level detection electrode 201 and the bottom surface of the water-containing cavity 110 is equivalent to a resistor R3, and the result is Figure 4 The low water level detection equivalent circuit is shown.

[0045] The conductivity of water is related to the resistance of water. The larger the resistance, the worse the conductivity, and the smaller the resistance, the stronger the conductivity. When the water temperature is constant, the resistance R of water is inversely proportional to the vertical cross-sectional area F of the water level detection electrode and the distance L between the detection end of the water level detection electrode and the bottom surface of the water containing cavity 110 (for example, Figure 1 It can be seen that when the water in the water-containing cavity 110 covers different water level detection electrodes, the equivalent resistance value of the water is different, and the voltage value U detected by the main control chip 21 at the first pin 211 is SW Also corresponds to different.

[0046] According to the principle of voltage division, when the water in the water-containing cavity 110 only covers the first water level detection electrode 201 at the lowest height, the voltage value detected by the main control chip 21 at the first pin 211 is Therefore, when the voltage value detected by the main control chip 21 at the first pin 211 is When the water level reaches the low water level, the main control chip 21 generates water level detection information of the low water level.

[0047] Since the resistivity of water of different water qualities is different, the equivalent resistance R3 of water is actually in a resistance range. Assuming that the upper and lower limits of the resistance range are R1 and RL, that is, R1≤R3≤RL, the voltage value U detected by the main control chip 21 at the first pin 211 is SW In and During this time, the main control chip 21 generates water level detection information of a low water level (or water level detection information that the water in the water containing cavity is at the first water level).

[0048] See also Figure 5 , Figure 5 This is a schematic diagram of the structure of a high water level detection equivalent circuit shown in an embodiment of the present application; Figure 5 This is a schematic diagram of the structure of the high water level detection equivalent circuit shown in an embodiment of the present application. Figures 1 to 5 As shown, when the water in the water-containing cavity 110 covers the second water level detection electrode 202, the water level in the water-containing cavity 110 is at a high water level. At this time, the first water level detection electrode 201 can detect water, and the second water level detection electrode 202 can also detect water. The water between the detection end of the first water level detection electrode 201 and the bottom surface of the water-containing cavity 110 is equivalent to a resistor R3, and the water between the detection end of the second water level detection electrode 202 and the bottom surface of the water-containing cavity 110 is equivalent to a resistor R4, and the result is Figure 5 The high water level detection equivalent circuit is shown.

[0049] Since the resistivity of water of different water quality is different, the equivalent resistance R3 of water is actually in a resistance range. It is assumed that the upper and lower limits of the resistance range are Rl and RL, that is, Rl≤R3≤RL; correspondingly, the equivalent resistance R4 of water is also actually in a resistance range. It is assumed that the upper and lower limits of the resistance range are Rh and RH, that is, Rh≤R4≤RH.

[0050] When the water in the water-containing cavity 110 is above the second water level detection electrode 202, the voltage value U detected by the main control chip 21 at the first pin 211 is SW In with VCC* During this time, the main control chip 21 generates water level detection information of a high water level (or water level detection information that the water in the water containing cavity is at a second water level).

[0051] Based on the above content, the first compensation resistor 212 and each threshold compensation resistor 213 in the present application are configured to distinguish the voltage comparison intervals corresponding to multiple water levels, so as to avoid overlapping parts of the voltage comparison intervals corresponding to multiple water level detections, affecting the water level judgment; the current limiting resistor 22 is configured to divide the voltage and limit the current.

[0052] See also Figure 6 , Figure 6 This is a schematic diagram of the structure of a multi-water level detection equivalent circuit shown in an embodiment of the present application. Figures 1 to 6 As shown, a first water level detection electrode 201, a second water level detection electrode 202 whose detection level is higher than the first water level detection electrode 201, and a plurality of supplementary water level detection electrodes 203 whose detection level is higher than the second water level detection electrode 202 are provided in the water containing cavity 110. When the water in the water containing cavity 110 covers all the water level detection electrodes, all the water level detection electrodes can detect water, and the water between the detection end of the first water level detection electrode 201 and the bottom surface of the water containing cavity 110 is equivalent to a resistor R3, the water between the detection end of the second water level detection electrode 202 and the bottom surface of the water containing cavity 110 is equivalent to a resistor R4, and the water between the detection end of the supplementary water level detection electrode 203 and the bottom surface of the water containing cavity 110 is equivalent to resistors R6, R8, and so on to Rn, so as to obtain Figure 6 The multi-water level detection equivalent circuit is shown.

[0053] Since the resistivity of water of different water quality is different, the equivalent resistance R3 of water is actually in a resistance range, assuming that the upper and lower limits of the resistance range are Rl and RL respectively, that is, Rl≤R3≤RL; correspondingly, the equivalent resistance R4 of water is actually in a resistance range, assuming that the upper and lower limits of the resistance range are Rh and RH respectively, that is, Rh≤R4≤RH; correspondingly, the equivalent resistance Rn of water is actually in a resistance range, assuming that the upper and lower limits of the resistance range are Rm and RM respectively, that is, Rm≤Rn≤RM; and so on.

[0054] Please combine Figures 4 to 6 As shown, when the voltage value U detected by the main control chip 21 at the first pin 211 is SW , in the first voltage comparison interval That is V H1_min ≤U SW ≤V H1_max When the main control chip 21 generates water level detection information that the water in the water-containing cavity is at a first water level; when the voltage value U detected by the main control chip 21 at the first pin 211 SW , in the second voltage comparison interval That is V H2_min ≤U SW ≤V H2_maxWhen the main control chip 21 generates water level detection information that the water in the water-containing cavity is at the second water level; when the voltage value U detected by the main control chip 21 at the first pin 211 is SW , when it is in the nth voltage comparison interval, that is, V H2_min ≤U SW ≤V H2_max When the water in the water-containing cavity is at the nth water level, the main control chip 21 generates water level detection information that the water in the water-containing cavity is at the nth water level. Among them, the first water level is lower than the second water level, the second water level is lower than the third water level, ..., the n-1th water level is lower than the nth water level, and so on.

[0055] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A water level detection system for a heating kettle, characterized in that: The heating kettle has a water holding cavity, and the water level detection system comprises: The first water level detection electrode and the second water level detection electrode are both arranged on the inner wall of the water containing cavity, and the height of the detection end of the second water level detection electrode relative to the bottom surface of the water containing cavity is greater than the height of the detection end of the first water level detection electrode relative to the bottom surface of the water containing cavity; The main control chip, the first water level detection electrode and the second water level detection electrode are both electrically connected to a first pin of the main control chip, and the main control chip has the function of detecting a voltage value at the first pin and generating water level information according to the voltage value.

2. The water level detection system of the heating kettle according to claim 1, characterized in that: The water level detection system of the heating kettle also includes: a first compensation resistor, one end of the first compensation resistor being connected to one end of the second water level detection electrode, and the other end of the first compensation resistor being connected to the first pin; The first water level detection electrode is connected in parallel with the first compensation resistor and the second water level detection electrode, one end of the first water level detection electrode is connected to the first pin, and the other end of the first water level detection electrode is grounded.

3. The water level detection system of the heating kettle according to claim 1, characterized in that: The water level detection system of the heating kettle also includes: A current limiting resistor, one end of which is connected to the power supply module, and the other end of which is connected to the first pin and the first water level detection electrode.

4. The water level detection system of the heating kettle according to claim 1, characterized in that: The water level detection system of the heating kettle also includes: A first capacitor is connected in parallel with the first water level detection electrode, one end of the first capacitor is connected to the first pin, and the other end of the first capacitor is grounded.

5. The water level detection system of the heating kettle according to any one of claims 1 to 4, characterized in that: The water level detection system of the heating kettle also includes: At least one supplementary water level detection electrode is disposed inside the water containing cavity, and the detection ends of the first water level detection electrode, the second water level detection electrode and all the supplementary water level detection electrodes are located at different heights compared to the bottom surface of the water containing cavity; The first water level detection electrode, the second water level detection electrode and all the supplementary water level detection electrodes are electrically connected to the first pin of the main control chip.

6. The water level detection system of the heating kettle according to claim 5, characterized in that: The water level detection system of the heating kettle also includes: At least one threshold compensation resistor, one of the threshold compensation resistors is connected in series with one of the replenishing water level detection electrodes, and one end of the threshold compensation resistor is connected to the first pin; The first water level detection electrode is connected in parallel with the threshold compensation resistor and the supplementary water level detection electrode which are connected in series.

7. A heating kettle, characterized in that: The heating kettle comprises: a water level detection system for the heating kettle as claimed in any one of claims 1-6.

8. The heating kettle according to claim 7, characterized in that: The heating kettle comprises a cup body and a handle, wherein the cup body has the water-containing cavity inside, the two ends of the handle are connected to the cup body, and the handle has wire-containing holes penetrating the two ends. The first water level detection electrode is arranged at the connection between one end of the handle and the cup body, and the second water level detection electrode is arranged at the connection between the other end of the handle and the cup body. The first water level detection electrode and the second water level detection electrode are electrically connected through the connecting wire in the wire hole.

9. The heating kettle according to claim 7, characterized in that: The heating kettle also includes: A coupler, wherein the coupler has a first input end and a first output end that can be electrically connected, the first water level detection electrode and the second water level detection electrode are both electrically connected to the first input end, and the first pin is electrically connected to the first output end.

10. The heating kettle according to claim 9, characterized in that: The heating kettle also includes: A heating plate, wherein the two power supply terminals of the heating plate are electrically connected to the second access terminal and the third access terminal of the coupler respectively, and the fourth access terminal of the coupler is grounded; and / or an NTC detection component, wherein the NTC detection component is electrically connected to the fifth access terminal and the sixth access terminal of the coupler.

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