Magnetic knob based on Hall element

Abstract

The utility model discloses a magnetic knob based on a Hall element, and relates to the technical field of induction cooker appliances. The knob turncap is installed on the knob base, the knob base is arranged above the panel, a magnet hole and two sensor holes are formed in the upper end of the support, a second positioning magnet is installed in the magnet hole, Hall sensors are installed in the two sensor holes, the support is arranged below the panel, and the second positioning magnet and the first positioning magnet are attracted; according to the utility model, the magnetoelectric effect between the magnet and the Hall sensor is utilized to realize the control of an electric appliance and the setting of parameters, when the magnet is close to or far away from the Hall sensor, the Hall sensor can output a square wave signal, and the man-machine interaction is realized through the processing of the square wave signal; the magneto-electric effect is separated from objects, so that the problem of panel trepanning is solved, and the completeness and the sealing performance of the panel are ensured; and compared with wireless communication or detection processing on touch variation, the stability is high, and the development difficulty is lower.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic cooker appliances, and particularly relates to a magnetic knob based on a Hall element. Background Art

[0002] The existing control methods of electromagnetic cookers are as follows:

[0003] I. Mechanical knob method: The knob cap is connected to the circuit board inside the appliance via a rotating control shaft, and the appliance is controlled by rotating the knob cap.

[0004] II. Touch method: The circuit board inside the appliance consists of a touch chip and a touch spring. When a finger approaches the panel, the capacitance or resistance value between the spring button and the ground changes. The touch chip calculates the change amount to finally determine whether a finger approaches to implement the button function.

[0005] III. Touch magnetic knob method: Actually, it is a derivative of the touch control method. A magnet is built into the center of the knob (for fixing to the panel and rotation), and an iron sheet is built into the outer ring of the knob. By rotating the knob, 360-degree rotation of the iron sheet can be achieved. The touch buttons distributed annularly on the control board use the iron sheet as a trigger. Wherever the iron sheet rotates to, the corresponding touch button below is activated to control the appliance.

[0006] IV. Wireless magnetic knob method: A magnet is built into the center of the knob (for fixing to the panel and rotation), a circuit board and a battery for power supply are built into the knob, and the circuit board inside the knob communicates wirelessly with the circuit board inside the machine to control the appliance.

[0007] The above control methods have the following disadvantages:

[0008] 1. The mechanical knob method has an obvious disadvantage, that is, the panel needs to be perforated to realize the linkage between the knob and the circuit board inside the appliance, which destroys the integrity and sealing of the panel and is also prone to dirt accumulation, bringing inconvenience to the daily cleaning work.

[0009] 2. The reliability of the touch method depends entirely on the performance of the touch chip and the accuracy of the touch algorithm. The change amount of the touch is easily affected by water and temperature on the panel, etc., and there is a high possibility of misoperation.

[0010] 3. The touch magnetic knob method also has the same problems as the touch method, and there are many circuit board touch buttons and their distribution is special (circular distribution).

[0011] 4. For the wireless magnetic knob method, the knob structure is complex, the cost is high, the wireless communication is easily interfered, and the development difficulty is high. Content of the Utility Model

[0012] In order to solve the problems mentioned in the above background technology, the purpose of the utility model is to provide a magnetic knob based on a Hall element.

[0013] The utility model discloses a magnetic knob based on a Hall element, comprising a knob cap, an induction magnet 1, an induction magnet 2, an induction magnet 3, an induction magnet 4, a positioning magnet 1, a knob base, a panel, a positioning magnet 2, a Hall sensor, a bracket and a circuit board; a mounting hole is arranged at the center of the upper end surface of the knob base, the positioning magnet 1 is installed in the mounting hole, four fixing holes are evenly arranged at the inner edge of the knob base, the induction magnet 1, the induction magnet 2, the induction magnet 3 and the induction magnet 4 are respectively installed in the four fixing holes, the knob cap is arranged on the knob base, the knob base is arranged above the panel, the bracket is arranged on the circuit board, the upper end of the bracket is respectively provided with a magnet hole and two sensor holes, the positioning magnet 2 is installed in the magnet hole, the two sensor holes are both installed with Hall sensors, the bracket is arranged below the panel, and the positioning magnet 2 is attracted to the positioning magnet 1.

[0014] Preferably, a plurality of inverted clips are provided at the bottom of the bracket, and the plurality of inverted clips are engaged in engaging holes provided on the circuit board.

[0015] Preferably, the Hall sensor and the induction magnet are on a vertical axis.

[0016] Preferably, the panel is a panel that cannot be adsorbed or magnetized by a magnet.

[0017] Preferably, the panel is a glass panel or a plastic panel.

[0018] Preferably, a MUC chip is mounted on the circuit board.

[0019] A method for using a magnetic knob based on a Hall element comprises the following steps: when the knob is rotated, when a certain induction magnet approaches a first Hall sensor, the first Hall sensor firstly changes from a low level to a high level, and the second Hall sensor maintains the same level; when approaching a second Hall sensor, the first Hall sensor maintains the same high level, and the second Hall sensor also changes from a low level to a high level; as the rotation continues, the first and second Hall sensors change from a high level to a low level in sequence; thereafter, both Hall sensors maintain a low level state until the second induction magnet arrives, and this process is repeated.

[0020] Compared with the prior art, the utility model has the following beneficial effects: the control of electrical appliances and parameter setting by magnetoelectric effect are achieved through the cooperation of the knob cap, induction magnet 1, induction magnet 2, induction magnet 3, induction magnet 4, positioning magnet 1, knob base, panel, positioning magnet 2, Hall sensor, bracket and circuit board. The specific advantages are:

[0021] 1. Utilize the magnetoelectric effect between a magnet and a Hall sensor to achieve the control of electrical appliances and the setting of parameters. When the magnet approaches or moves away from the Hall sensor, the Hall sensor outputs a square wave signal. Through the processing of the square wave signal, the interaction between humans and machines can be realized.

[0022] 2. The magnetoelectric effect can act across space and objects, thus solving the problem of panel openings and ensuring the integrity and sealing of the panel.

[0023] 3. Compared with wireless communication or the detection and processing of touch change amounts, it has higher stability and lower development difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] For ease of explanation, the present utility model will be described in detail by the following specific embodiments and accompanying drawings.

[0025] Figure 1 Is an exploded view of the present utility model;

[0026] Figure 2 Is a structural schematic diagram of the present utility model;

[0027] Figure 3 Is a square wave signal diagram of the present utility model rotating clockwise;

[0028] Figure 4 Is a square wave signal diagram of the present utility model rotating counterclockwise;

[0029] Figure 5 Is a flow chart of the present utility model.

[0030] In the figures: 1 - knob cap; 2 - induction magnet one; 3 - induction magnet two; 4 - induction magnet three; 5 - induction magnet four; 6 - positioning magnet one; 7 - knob base; 8 - panel; 9 - positioning magnet two; 10 - Hall sensor; 11 - bracket; 12 - circuit board. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in the utility model, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects that can be produced by the utility model and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the utility model. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0032] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0033] like Figures 1 to 5 As shown, this specific implementation adopts the following technical scheme: it includes a knob cap 1, an induction magnet 1 2, an induction magnet 2 3, an induction magnet 3 4, an induction magnet 4 5, a positioning magnet 1 6, a knob base 7, a panel 8, a positioning magnet 2 9, a Hall sensor 10, a bracket 11, and a circuit board 12; a mounting hole is provided at the center of the upper end surface of the knob base 7, and a positioning magnet 1 6 is installed in the mounting hole; four fixing holes are evenly provided at the inner edge of the knob base 7, and induction magnet 1 2, induction magnet 2 3, induction magnet 3 4, and induction magnet 4 5 are installed in the four fixing holes respectively; the knob cap 1 is installed on the knob base 7, and the knob cap 1 is installed on the knob base 7. The button base 7 is arranged above the panel 8, the bracket 11 is installed on the circuit board 12, the upper end of the bracket 11 is respectively provided with a magnet hole and two sensor holes, the magnet hole is provided with a positioning magnet 2 9, the two sensor holes are provided with a Hall sensor 10, the bracket 11 is arranged below the panel 8, the positioning magnet 2 9 is attracted to the positioning magnet 1 6; the bottom of the bracket 11 is provided with several inverted clips, and the several inverted clips are connected to the connecting holes provided on the circuit board 12; the Hall sensor 10 and the induction magnet 1 2 are on the vertical axis; the panel 8 is a panel that is not attracted and magnetized by a magnet, such as a glass panel or a plastic panel. A MUC chip is installed on the circuit board 12.

[0034] In this specific embodiment, the bracket 11 is installed on the circuit board 12 and integrated with the circuit board 12. The knob is adsorbed to the positioning magnet two 9 installed in the bracket 11 through the positioning magnet one 6 installed at the central position, with the panel 8 (glass, plastic, etc., which cannot be adsorbed / magnetized by magnets) in between. In this way, the knob can rotate counterclockwise or clockwise around the center relying on the magnetic bead installed in the middle of the knob. When the knob rotates, the four induction magnets (induction magnet one 2, induction magnet two 3, induction magnet three 4, induction magnet four 5) built into the outer ring of the knob pass above the two Hall sensors 10 in sequence. Due to the magnetoelectric effect, the two Hall sensors 10 will generate two groups of special square wave signals (a signal and b signal) successively. As Figure 3 , Figure 4 shown, based on the two groups of square wave signals (a and b), the MCU on the circuit board can judge whether the knob is rotating counterclockwise or clockwise by detecting the sequence of the rising edges of the a signal and the b signal; and can judge the speed of the knob rotation by the number of jumps of the a signal or the b signal, so as to realize the control of the electrical appliance and the setting of parameters.

[0035] In this specific embodiment, 4 induction magnets are evenly distributed at 90 degrees on the outer ring of the knob. The number of magnets can be reduced or increased, and the same can be achieved, but the rotation experience will be different.

[0036] As Figure 5 shown, a method for using a magnetic knob based on Hall elements includes the following steps: When the knob rotates, when a certain induction magnet approaches the first Hall sensor 10, the first Hall sensor 10 first undergoes a jump from low level to high level, and the second Hall sensor 10 maintains the level unchanged; when approaching the second Hall sensor 10, the first Hall sensor 10 maintains the high level unchanged, and the second Hall sensor 10 also undergoes a jump from low level to high level; as the rotation continues, the first and second Hall sensors 10 successively undergo jumps from high level to low level; then both Hall sensors 10 maintain the low level state until the arrival of the second induction magnet, and so on.

[0037] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0038] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A magnetic knob based on a Hall element, characterized in that: The invention comprises a knob cap (1), an induction magnet 1 (2), an induction magnet 2 (3), an induction magnet 3 (4), an induction magnet 4 (5), a positioning magnet 1 (6), a knob base (7), a panel (8), a positioning magnet 2 (9), a Hall sensor (10), a bracket (11), and a circuit board (12); a mounting hole is arranged at the center of the upper end surface of the knob base (7), and the positioning magnet 1 (6) is installed in the mounting hole; four fixing holes are evenly arranged at the inner edge of the knob base (7), and the induction magnets 1 (2) are respectively installed in the four fixing holes. , induction magnet 2 (3), induction magnet 3 (4), induction magnet 4 (5), the knob cap (1) is mounted on the knob base (7), the knob base (7) is arranged above the panel (8), the bracket (11) is mounted on the circuit board (12), the upper end of the bracket (11) is respectively provided with a magnet hole and two sensor holes, the magnet hole is provided with a positioning magnet 2 (9), the two sensor holes are both provided with a Hall sensor (10), the bracket (11) is arranged below the panel (8), and the positioning magnet 2 (9) is attracted to the positioning magnet 1 (6).

2. A magnetic knob based on a Hall element according to claim 1, characterized in that: The bottom of the bracket (11) is provided with a plurality of inverted clips, which are engaged with the engaging holes provided on the circuit board (12).

3. The magnetic knob based on the Hall element according to claim 1, characterized in that: The Hall sensor (10) and the induction magnet (2) are on a vertical axis.

4. The magnetic knob based on the Hall element according to claim 1, characterized in that: The panel (8) is a panel that cannot be attracted or magnetized by a magnet.

5. The magnetic knob based on the Hall element according to claim 4, characterized in that: The panel (8) is a glass panel.

6. The magnetic knob based on the Hall element according to claim 4, characterized in that: The panel (8) is a plastic panel.

7. The magnetic knob based on the Hall element according to claim 1, characterized in that: A MUC chip is mounted on the circuit board (12).

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