A dual-line hall sensor and a detection circuit thereof

Abstract

The utility model discloses a kind of double-line hall sensor and its detection circuit, belong to hall sensor technical field, including hall chip, voltage dividing circuit, voltage stabilizing circuit and protection circuit, the hall chip has voltage input port, ground port and signal output port, the signal output port is connected with the voltage input port by the voltage dividing circuit, the ground port is connected with the voltage input port between parallelly arranged the voltage stabilizing circuit and the protection circuit, the voltage input port is used to connect with external detection circuit, the ground port is used to connect with external reference ground connection.The utility model only needs to be realized by setting two wires power supply and signal output of hall sensor.

Description

Technical Field

[0001] This utility model relates to the field of Hall sensor technology, and in particular to a dual-wire Hall sensor and its detection circuit. Background Technology

[0002] With the development of society, more and more home appliances are gradually becoming intelligent, such as refrigerators, water purifiers, robot vacuums, and coffee machines. In order to meet the needs of intelligent automation, it is necessary to detect the approach and departure of magnets. Current Hall sensors have three wires: a power wire, a ground wire, and a signal wire. The power wire and ground wire are used for power supply, while the signal wire is used for signal output. In order to better adapt to the current market, there is an urgent need to design a Hall sensor that only requires two wires to achieve power supply and signal output. Utility Model Content

[0003] The purpose of this invention is to provide a dual-wire Hall sensor and its detection circuit to solve the above-mentioned problems.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A dual-wire Hall sensor includes a Hall chip, a voltage divider circuit, a voltage regulator circuit, and a protection circuit. The Hall chip has a voltage input port, a ground port, and a signal output port. The signal output port is connected to the voltage input port through the voltage divider circuit. The voltage regulator circuit and the protection circuit are connected in parallel between the ground port and the voltage input port. The voltage input port is used to connect to an external detection circuit, and the ground port is used to connect to an external reference ground.

[0006] Preferably, the voltage divider circuit includes a first voltage divider resistor, which is connected to the voltage input port and the signal output port respectively.

[0007] Preferably, the voltage regulator circuit includes a voltage regulator capacitor, which is connected to the ground port and the voltage input port respectively.

[0008] Preferably, the protection circuit includes a TVS diode, with the positive terminal of the TVS diode connected to the grounding port and the negative terminal connected to the voltage input port.

[0009] A detection circuit is provided for powering a two-wire Hall sensor as described in any of the preceding claims, and for detecting the voltage at the voltage input terminal of the two-wire Hall sensor to determine whether a magnetic field is near the Hall sensor.

[0010] Preferably, the detection circuit includes a detection chip, a power supply, and a second voltage divider resistor. The detection chip has an A / D detection port. The power supply is connected to one end of the second voltage divider resistor, and the other end of the second voltage divider resistor is connected to the voltage input port of the Hall sensor. The A / D detection port of the detection chip is connected to the other end of the second voltage divider resistor.

[0011] One embodiment of this utility model has the following beneficial effects:

[0012] 1. By setting a voltage divider circuit between the voltage input port and the signal output port of the Hall chip, the output signal of the Hall chip can be fed back to the input voltage of the Hall chip. When the signal output port outputs a low level, the voltage divider circuit divides the input voltage; when the signal output port outputs a high level, the voltage divider circuit does not participate in the voltage division. Therefore, the external detection circuit can determine whether the magnetic component is close to or far from the Hall chip by detecting the voltage at the voltage input port.

[0013] 2. The dual-wire Hall sensor of this utility model only requires the power supply wire and the ground wire to be connected to the outside, which can ensure power supply and also output signals, thus solving the problem that the current Hall sensor requires three wires to work properly.

[0014] 3. The voltage regulator circuit can stabilize the voltage at the voltage input port, reduce voltage fluctuations and voltage spikes on the Hall chip, making the Hall chip more stable during operation, the output signal smoother, and ensuring long-term stable operation of the Hall chip.

[0015] 4. The protection circuit can protect the Hall chip. When the voltage at the voltage input port is too high, it connects the voltage input port to the ground port, thereby pulling down the voltage at the voltage input port and preventing the Hall chip from being damaged due to excessive voltage. Attached Figure Description

[0016] The accompanying drawings further illustrate the present invention, but the content of the drawings does not constitute any limitation on the present invention.

[0017] Figure 1 This is a schematic circuit block diagram of a dual-wire Hall sensor according to one embodiment of the present invention;

[0018] Figure 2 This is a circuit diagram of a dual-wire Hall sensor according to one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the connection between the detection circuit and the dual-wire Hall sensor in one embodiment of this utility model;

[0020] Figure 4 This is a schematic diagram of the connection circuit between the detection circuit and the dual-wire Hall sensor in one embodiment of this utility model;

[0021] In the attached diagram: 1-Dual-wire Hall sensor, 11-Hall chip, 12-Voltage divider circuit, 13-Voltage regulator circuit, 14-Protection circuit, 2-Detection circuit, 21-Detection chip, 22-Power supply. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] A dual-wire Hall sensor 1 according to this embodiment includes a Hall chip 11, a voltage divider circuit 12, a voltage regulator circuit 13, and a protection circuit 14. The Hall chip 11 has a voltage input port, a ground port, and a signal output port. The signal output port is connected to the voltage input port through the voltage divider circuit 12. The voltage regulator circuit 13 and the protection circuit 14 are connected in parallel between the ground port and the voltage input port. The voltage input port is used to connect to an external detection circuit 2, and the ground port is used to connect to an external reference ground.

[0028] This invention establishes a voltage divider circuit 12 between the voltage input port and signal output port of the Hall chip 11, allowing the output signal of the Hall chip 11 to be fed back to its input voltage. When the signal output port outputs a low level, the voltage divider circuit 12 divides the input voltage; when the signal output port outputs a high level, the voltage divider circuit 12 does not participate in voltage division. Therefore, the external detection circuit 2 can determine whether the magnetic component is close to or far from the Hall chip 11 by detecting the voltage at the voltage input port. Of course, the external detection circuit 2 also needs to include a corresponding second voltage divider resistor R2. The input voltage is divided by the second voltage divider resistor R2 and the voltage divider circuit 12. After the voltage is divided by the second voltage divider resistor R2 and the voltage divider circuit 12, the voltage at the voltage input port will change. By detecting the voltage value at the voltage input port, the state of the Hall chip 11 can be determined based on the magnitude of the voltage value. The dual-wire Hall sensor 1 of this invention only requires a power supply wire and a ground wire to be connected to the outside, which can ensure power supply and also output signals, thus solving the problem that current Hall sensors require three wires to work properly.

[0029] The voltage regulator circuit 13 can stabilize the voltage at the voltage input port, reduce voltage fluctuations and voltage spikes, and make the Hall chip 11 more stable during operation, with a smoother output signal, ensuring long-term stable operation of the Hall chip 11. The protection circuit 14 can protect the Hall chip 11. When the voltage at the voltage input port is too high, it connects the voltage input port to the ground port, thereby pulling down the voltage at the voltage input port and preventing the Hall chip 11 from being damaged due to excessive voltage.

[0030] Furthermore, the voltage divider circuit 12 includes a first voltage divider resistor R1, which is connected to the voltage input port and the signal output port respectively.

[0031] Resistors have the advantage of low cost. By setting the first voltage divider resistor R1 for voltage division, not only can a good voltage division effect be achieved, but the cost of resistors is also low, which helps to reduce costs.

[0032] Furthermore, the voltage regulator circuit 13 includes a voltage regulator capacitor C, which is connected to the ground port and the voltage input port respectively.

[0033] When the voltage at the voltage input port fluctuates, the voltage regulator capacitor C can absorb the circuit oscillation, keeping the voltage at the voltage input port stable and preventing circuit fluctuations from affecting the instability of the output signal.

[0034] Furthermore, the protection circuit 14 includes a TVS diode D, the positive terminal of which is connected to the grounding port, and the negative terminal is connected to the voltage input port.

[0035] When the voltage at the voltage input port is lower than the breakdown voltage of the TVS diode D, the TVS diode D is in an open-circuit state, and the external voltage continuously supplies power to the voltage input port, allowing the Hall chip 11 to operate normally. When the voltage at the voltage input port is higher than the breakdown voltage of the TVS diode D, the TVS diode D will conduct, connecting the voltage input port to the ground port, thereby short-circuiting the Hall chip 11 and preventing damage to the Hall chip 11 due to excessive voltage at the voltage input port. The TVS diode D can always clamp the voltage difference between the voltage input port and the ground port to a safe value, thus providing protection.

[0036] A detection circuit 2 is used to power a dual-wire Hall sensor 1 as described in any of the above claims, and to detect the voltage at the voltage input terminal of the dual-wire Hall sensor 1 to determine whether a magnetic field is near the Hall sensor.

[0037] Furthermore, the detection circuit 2 includes a detection chip 21, a power supply 22, and a second voltage divider resistor R2. The detection chip 21 has an A / D detection port. The power supply 22 is connected to one end of the second voltage divider resistor R2, and the other end of the second voltage divider resistor R2 is connected to the voltage input port of the Hall sensor. The A / D detection port of the detection chip 21 is connected to the other end of the second voltage divider resistor R2.

[0038] The power supply 22 provides voltage to the Hall chip 11. The first voltage divider resistor R1 and the second voltage divider resistor R2 change the voltage at the voltage input terminal through voltage division, so that the detection chip 21 can determine the state of the Hall chip 11 by detecting the voltage at the voltage input terminal. The specific process is as follows:

[0039] When the magnetic field approaches Hall chip 11, the signal output port outputs a low level. At this time, the first voltage divider resistor R1 participates in voltage division. Since the first voltage divider resistor R1 and the second voltage divider resistor R2 are in series, the voltage at the voltage input port is:

[0040] V DD =V CC / (R1+R2)×R1

[0041] By adjusting the resistance ratio of the first voltage divider resistor R1 and the second voltage divider resistor R2, the voltage at the voltage input port after voltage division can be flexibly adjusted so that the voltage at the voltage input port remains within the normal operating voltage range of the Hall chip 11 after voltage division.

[0042] When the magnetic field moves away from Hall chip 11, the signal output port outputs a high level. At this time, the first voltage divider resistor R1 does not participate in the voltage division, and the voltage at the voltage input port is pulled to the power supply terminal 22. That is, the voltage at the voltage input port is:

[0043] V DD =V CC

[0044] Therefore, the state of Hall chip 11 can be determined by detecting the voltage value at the voltage input port. Thus, the Hall sensor of this invention only requires two wires to realize the functions of power supply and signal output. Compared with the existing three-wire Hall sensor, one wire can be reduced, and the size of the terminal interface is smaller, which is beneficial to reduce the size occupied by the terminal interface on the circuit board.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A dual-wire Hall sensor, characterized in that, It includes a Hall effect chip, a voltage divider circuit, a voltage regulator circuit, and a protection circuit. The Hall effect chip has a voltage input port, a ground port, and a signal output port. The signal output port is connected to the voltage input port through the voltage divider circuit. The voltage regulator circuit and the protection circuit are connected in parallel between the ground port and the voltage input port. The voltage input port is used to connect to an external detection circuit, and the ground port is used to connect to an external reference ground.

2. A dual-wire Hall sensor according to claim 1, characterized in that, The voltage divider circuit includes a first voltage divider resistor, which is connected to the voltage input port and the signal output port respectively.

3. A dual-wire Hall sensor according to claim 1, characterized in that, The voltage regulator circuit includes a voltage regulator capacitor, which is connected to the ground port and the voltage input port respectively.

4. A dual-wire Hall sensor according to claim 1, characterized in that, The protection circuit includes a TVS diode, with the positive terminal of the TVS diode connected to the grounding port and the negative terminal connected to the voltage input port.

5. A detection circuit, characterized in that, The detection circuit is used to power a dual-wire Hall sensor as described in any one of claims 1-4, and to detect the voltage at the voltage input terminal of the dual-wire Hall sensor to determine whether a magnetic field is near the Hall sensor.

6. A detection circuit according to claim 5, characterized in that, The detection circuit includes a detection chip, a power supply, and a second voltage divider resistor. The detection chip has an A / D detection port. The power supply is connected to one end of the second voltage divider resistor, and the other end of the second voltage divider resistor is connected to the voltage input port of the Hall sensor. The A / D detection port of the detection chip is connected to the other end of the second voltage divider resistor.

Images