A dual-wire magnetic induction sensor circuit, sensor, detection circuit and electrical appliance

Abstract

The utility model discloses a kind of double-line magnetic induction sensor circuit, sensor, detection circuit and electrical appliance, belong to sensor technical field, comprising: magnetic induction chip, the magnetic induction chip includes first voltage input port, first ground port and signal output port;The first voltage input port is used to connect with the power supply outside;The push-pull circuit includes first input, second input, control end and output, the first input is connected with the first voltage input port, the second input is connected with the first ground port, the control end is connected with the signal output port, the first ground port is connected with the output by first voltage dividing resistance, and the output is used to output detection signal to the detection circuit outside.This utility model only needs two wires to realize the effect of sensor power supply and output signal.

Description

Technical Field

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

[0002] With the development of society, electrical appliances have become increasingly functional, and the realization of these functions is inseparable from the use of sensors. Magnetic induction sensors play an important role in many functions of electrical appliances. Currently, magnetic induction sensors typically require three external wires, including voltage input, grounding, and signal output. Corresponding three-wire interfaces also need to be set up inside the appliance. For the compact space inside the appliance, this undoubtedly occupies valuable internal space, and the cost of wiring is high, which also increases the difficulty of wiring. Therefore, how to reduce the number of wires in magnetic induction sensors is a problem that magnetic induction sensors urgently need to solve. Utility Model Content

[0003] The purpose of this invention is to provide a dual-wire magnetic induction sensor circuit, sensor, detection circuit, and electrical appliance to solve the above-mentioned problems.

[0004] To achieve this objective, the present invention adopts the following technical solution: A dual-wire magnetic induction sensor circuit includes: A magnetic induction chip, comprising a first voltage input port, a first ground port, and a signal output port; the first voltage input port is used to connect to an external power supply. The push-pull circuit includes a first input terminal, a second input terminal, a control terminal, and an output terminal. The first input terminal is connected to the first voltage input port, the second input terminal is connected to the first ground port, the control terminal is connected to the signal output port, the first ground port is connected to the output terminal through a first voltage divider resistor, and the output terminal is used to output a detection signal to an external detection circuit.

[0005] Preferably, the magnetic induction chip outputs a first signal and a second signal at its output port; the push-pull circuit connects the first input terminal to the output terminal and disconnects the second input terminal from the output terminal according to the first signal; the push-pull circuit connects the second input terminal to the output terminal and disconnects the first input terminal from the output terminal according to the second signal.

[0006] Preferably, the push-pull circuit includes a first transistor and a second transistor; the drain of the first transistor is the first input terminal, the source of the second transistor is the second input terminal, the gate of the first transistor and the gate of the second transistor are connected as the control terminal, and the source of the first transistor and the drain of the second transistor are connected as the output terminal.

[0007] Preferably, the first transistor is an NMOS transistor and the second transistor is a PMOS transistor.

[0008] Preferably, the magnetic induction chip is a Hall chip, a TMR chip, an AMR chip, or a GMR chip.

[0009] Preferably, the system further includes a capacitor, one end of which is connected to the first voltage input port and the other end of which is connected to the first ground port.

[0010] A dual-wire magnetic induction sensor includes a sensor housing, a circuit board, a power supply wire, and a detection wire. The circuit board is equipped with a dual-wire magnetic induction sensor circuit as described above. The power supply wire is connected to the first voltage input port for connecting to a power supply. The detection wire is connected to the output terminal for outputting a detection signal. The circuit board is installed inside the sensor housing.

[0011] A detection circuit for a magnetic induction sensor is disclosed. The detection circuit is used to detect a detection signal output by a dual-wire magnetic induction sensor circuit as described above. The detection circuit includes a detection chip and a second voltage divider resistor. The detection chip has a second voltage input port, an I / O port, and a second ground port. The second voltage input port is used to connect to an external power supply, and the I / O port is connected to the output terminal. One end of the second voltage divider resistor is connected to the I / O port, and the other end is connected to the second ground port. The second ground port is connected to a reference ground.

[0012] An electrical appliance has a dual-wire magnetic induction sensor circuit as described above and a detection circuit for the magnetic induction sensor as described above; the electrical appliance is further equipped with a magnetic component that is movably disposed relative to the magnetic induction chip, and the detection circuit determines whether the magnetic component is close to or far from the magnetic induction chip based on the detection signal output by the dual-wire magnetic induction sensor circuit.

[0013] An electrical appliance includes a main control board, a power supply for providing power to the main control board, a dual-wire magnetic induction sensor as described above, and a magnetic component movably disposed relative to the dual-wire magnetic induction sensor; the main control board is provided with a detection circuit for the magnetic induction sensor as described above, and the main control board is provided with connection sockets respectively connected to the power supply and the I / O port; the power supply wire and the detection wire are connected to the connection sockets to power the dual-wire magnetic induction sensor and transmit detection signals; The detection circuit determines whether the magnetic component is close to or far from the dual-wire magnetic induction sensor based on the detection signal output by the dual-wire magnetic induction sensor.

[0014] One embodiment of this utility model has the following beneficial effects: 1. By setting up a push-pull circuit, it can connect the first voltage input port or the first ground port of the magnetic induction chip when the magnetic induction chip outputs a high level or a low level. This design enables the push-pull circuit to generate different types of detection signals. 2. Since the dual-wire magnetic induction sensor circuit only needs to connect to an external power supply at its first voltage input port to obtain power, and its output only needs to connect to an external detection circuit to transmit signals, the entire system only requires two wires for connection. This design not only reduces the number of wires used, but also significantly reduces the interface requirements of the detection circuit, thereby effectively saving space. 3. The first grounding port is connected to the output port through the first voltage divider resistor. When the output port is at a low level, the first grounding port is at a low voltage. When the output port is at a high level, the high level pulls the voltage down through the first voltage divider resistor, so that the first grounding port is still at a low voltage. Therefore, the first voltage output port and the first grounding port always maintain a voltage difference, thereby driving the magnetic induction chip to maintain stable operation. Attached Figure Description

[0015] The accompanying drawings further illustrate the present invention, but the content of the drawings does not constitute any limitation on the present invention.

[0016] Figure 1 This is a schematic diagram of the circuit structure of one embodiment of the present invention; Figure 2 This is a circuit diagram of a dual-wire magnetic induction sensor circuit according to one embodiment of the present invention. Figure 3 This is a circuit diagram of the detection circuit of one embodiment of the present invention; Figure 4 This is a schematic diagram of the connection circuit between the dual-wire magnetic induction sensor circuit and the detection circuit in one embodiment of this utility model; In the attached diagram: 100 - dual-wire magnetic induction sensor circuit, 1 - magnetic induction chip, 2 - push-pull circuit, R1 - first voltage divider resistor, Q1 - first transistor, Q2 - second transistor, C1 - capacitor, 200 - detection circuit, 3 - detection chip, R2 - second voltage divider resistor. Detailed Implementation

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] The first aspect of this utility model discloses a dual-wire magnetic induction sensor circuit 100, such as... Figure 1 As shown, it includes: The magnetic induction chip 1 includes a first voltage input port, a first ground port, and a signal output port; the first voltage input port is used to connect to an external power supply. The push-pull circuit 2 includes a first input terminal, a second input terminal, a control terminal, and an output terminal. The first input terminal is connected to the first voltage input port, the second input terminal is connected to the first ground port, the control terminal is connected to the signal output port, and the first ground port is connected to the output terminal through a first voltage divider resistor R1. The output terminal is used to output a detection signal to an external detection circuit 200.

[0023] First, by setting up a push-pull circuit 2, it can connect the first voltage input port or the first ground port of the magnetic induction chip 1 when the output of the magnetic induction chip 1 is high or low. This design allows the push-pull circuit 2 to generate different types of detection signals. When the external detection circuit 200 receives these different detection signals, it can accurately determine whether the magnetic induction component is close to or far from the magnetic induction chip 1.

[0024] In practical applications, the dual-wire magnetic induction sensor circuit 100 can be deployed in two ways: one is to encapsulate it within a magnetic induction sensor and then install the sensor inside the appliance; the other is to directly lay the dual-wire magnetic induction sensor circuit 100 on a circuit board and then install the circuit board inside the appliance. Regardless of the deployment method, the circuit needs to be connected to the main control board of the appliance via wires.

[0025] It is worth emphasizing that, since the dual-wire magnetic induction sensor circuit 100 only needs to be connected to an external power supply at its first voltage input port to obtain power, and its output only needs to be connected to the external detection circuit 200 to transmit signals, the entire system only requires two wires for connection. This design not only reduces the number of wires used, but also significantly reduces the interface requirements of the detection circuit 200, thereby effectively saving space.

[0026] In addition, the first grounding port is connected to the output terminal through the first voltage divider resistor R1. When the output terminal is at a low level, the first grounding port is at a low voltage. When the output terminal is at a high level, the high level pulls the voltage down through the first voltage divider resistor R1, so that the first grounding port is still at a low voltage. Therefore, the first voltage output port and the first grounding port always maintain a voltage difference, thereby driving the magnetic induction chip 1 to maintain stable operation.

[0027] Through this optimized design, the dual-wire magnetic induction sensor circuit 100 significantly improves the circuit integration and ease of installation while maintaining its original functions.

[0028] Furthermore, the magnetic induction chip 1 outputs a first signal and a second signal at its output port. The push-pull circuit 2 connects the first input terminal to the output terminal and disconnects the second input terminal from the output terminal according to the first signal. The push-pull circuit 2 connects the second input terminal to the output terminal and disconnects the first input terminal from the output terminal according to the second signal.

[0029] When the magnetic induction chip 1 outputs a first signal or a second signal, the push-pull circuit 2 can connect the first input terminal or the second input terminal to the output terminal. The first input terminal is connected to the first voltage input port, meaning the voltage at the first input terminal is the same as the supply voltage, i.e., a high level. The second input terminal is connected to the first ground port, meaning the voltage at the second input terminal is the same as the reference ground, i.e., a low level. Therefore, when the first input terminal is connected to the output terminal, when the magnetic induction chip 1 outputs the first signal, the push-pull circuit 2 connects the first input terminal to the output terminal, at which time the output terminal outputs a high level. When the magnetic induction chip 1 outputs the second signal, the push-pull circuit connects the second input terminal to the output terminal, at which time the output terminal outputs a low level. When the external detection circuit 200 obtains the voltage at the output terminal, it can determine whether the magnetic component is close to or far from the magnetic induction chip 1 based on whether the output is high or low. It should be noted that since the output terminal outputs a digital signal, ordinary I / O ports can read and identify the detection signal at the output terminal. Compared with the analog signal output by traditional magnetic induction sensors, outputting a digital signal can reduce the occupation of the precious A / D interface of the detection chip 3. It only needs to be connected to an ordinary I / O port, and even a detection chip 3 without an A / D interface can be selected, thereby reducing the cost of the application.

[0030] Specifically, such as Figure 2 As shown, the push-pull circuit 2 includes a first transistor Q1 and a second transistor Q2; the drain of the first transistor Q1 is the first input terminal, the source of the second transistor Q2 is the second input terminal, the gate of the first transistor Q1 and the gate of the second transistor Q2 are connected as the control terminal, and the source of the first transistor Q1 and the drain of the second transistor Q2 are connected as the output terminal.

[0031] As is well known, when the push-pull circuit 2 is working, only one transistor can be turned on. That is, under different level states, one of the first transistor Q1 and the second transistor Q2 is in the on state, while the other is in the off state. Using the gate of the first transistor Q1 and the gate of the second transistor Q2 as the control terminals, when the signal output port of the magnetic induction chip 1 outputs a high level or a low level, it can drive the first transistor Q1 or the second transistor Q2 to turn on respectively, so that the output terminal of the push-pull circuit 2 can output different signals. By identifying the signal, it can be determined whether the magnetic component is currently close to the magnetic induction chip 1 or far away from the magnetic induction chip 1.

[0032] Specifically, the first transistor Q1 is an NMOS transistor, and the second transistor Q2 is a PMOS transistor.

[0033] Since NMOS and PMOS transistors have different conduction conditions, using NMOS and PMOS transistors to form a push-pull circuit 2 can meet the application requirements of the push-pull circuit 2. When the control terminal is in different level states, one transistor can be driven to conduct while the other is turned off, thereby outputting different detection signals.

[0034] Specifically, the magnetic induction chip 1 is a Hall chip, a TMR chip, an AMR chip, or a GMR chip.

[0035] Furthermore, such as Figure 1 and 2 As shown, it also includes a capacitor C1, one end of which is connected to the first voltage input port and the other end of which is connected to the first ground port.

[0036] By setting capacitor C1, the voltage stability of the first voltage input port can be increased and voltage fluctuations can be reduced. When the voltage rises, capacitor C1 absorbs charge to suppress the voltage rise, and when the voltage drops, it releases charge to raise the voltage, thereby keeping the first voltage input port in a stable voltage range.

[0037] The second aspect of this utility model discloses a dual-wire magnetic induction sensor, including a sensor housing, a circuit board, a power supply wire, and a detection wire. The circuit board is equipped with a dual-wire magnetic induction sensor circuit 100 as described above. The power supply wire is connected to the first voltage input port for connecting to a power supply. The detection wire is connected to the output terminal for outputting a detection signal. The circuit board is installed inside the sensor housing.

[0038] By enclosing the dual-wire magnetic induction sensor circuit 100 within the dual-wire magnetic sensor, the dual-wire magnetic induction sensor circuit 100 can be protected from damage caused by impact, immersion in water, etc., making the dual-wire magnetic induction sensor applicable to various electrical appliances, such as rice cookers, robot vacuum cleaners, washing machines, and blenders, etc., which will not be listed here.

[0039] In addition, as an equivalent technical solution, the dual-wire magnetic induction sensor does not require power supply wires and detection wires. Instead, it has wiring sockets or connectors on the circuit board that are respectively connected to the first voltage input port and the output terminal. This allows the detection circuit 200 and the power supply to connect the wires to the wiring sockets or connectors to power the dual-wire magnetic induction sensor and acquire detection signals.

[0040] The third aspect of this utility model discloses a detection circuit 200 for a magnetic induction sensor, such as... Figure 3 and Figure 4As shown, the detection circuit 200 is used to detect the detection signal output by the dual-wire magnetic induction sensor circuit 100 described above. The detection circuit 200 includes a detection chip 3 and a second voltage divider resistor R2. The detection chip 3 has a second voltage input port, an I / O port, and a second ground port. The second voltage input port is used to connect to an external power supply, and the I / O port is connected to the output terminal. One end of the second voltage divider resistor R2 is connected to the I / O port, and the other end is connected to the second ground port. The second ground port is connected to a reference ground.

[0041] The detection chip 3 acquires the detection signal output by the dual-wire magnetic induction sensor circuit 100 through its I / O port, and connects to the I / O port through the second voltage divider resistor R2. This allows the first ground port of the magnetic induction chip 1 to be connected to the reference ground without affecting the normal communication between the I / O port of the detection chip 3 and the dual-wire magnetic induction sensor circuit 100, as detailed below: When the first input terminal and the output terminal of the push-pull circuit 2 are connected, the output terminal of the push-pull circuit 2 outputs a high level. Due to the presence of the first voltage divider resistor R1, the voltage of the first ground port is pulled low, thereby enabling the first ground port to achieve the effect of connecting to the reference ground. Moreover, due to the presence of the second voltage divider resistor R2, it can be ensured that the output terminal is not directly connected to the second ground port, which would cause the voltage of the output terminal to be pulled low. This ensures that the I / O port of the detection chip 3 can still read the high level output by the push-pull circuit 2. When the second input terminal of the push-pull circuit 2 is connected to the output terminal, the output terminal outputs a low level. At this time, the first voltage divider resistor R1 is short-circuited, and the first ground port is connected to the second ground port through the output terminal of the push-pull circuit 2 and the second voltage divider resistor R2, thereby achieving the effect of connecting the first ground port to the reference ground.

[0042] The fourth aspect of this utility model discloses an electrical appliance having a dual-wire magnetic induction sensor circuit 100 as described above and a detection circuit 200 for the magnetic induction sensor as described above; the electrical appliance is also equipped with a magnetic component movably disposed relative to the magnetic induction chip 1, and the detection circuit 200 determines whether the magnetic component is close to or far from the magnetic induction chip 1 based on the detection signal output by the dual-wire magnetic induction sensor circuit 100.

[0043] In this embodiment, by setting a dual-wire magnetic induction sensor circuit 100 and a detection circuit 200 in the appliance, when the magnetic component approaches or moves away from the magnetic induction chip 1, the output terminal of the dual-wire magnetic induction sensor circuit 100 sends different detection signals to the detection circuit 200. The detection circuit 200 determines the state of the magnetic component based on the detection signals. For example, in a rice cooker, the aforementioned dual-wire magnetic induction sensor circuit 100 and detection circuit 200 are set on the rice cooker body, and a magnetic component, such as a magnet, is set on the lid. When the lid is closed, the magnet approaches the dual-wire magnetic induction chip 1, at which time the dual-wire magnetic induction sensor circuit 100 sends a first signal to the detection circuit 200. When the lid is opened, the magnet moves away from the dual-wire magnetic induction chip 1, at which time the dual-wire magnetic induction circuit sends a second signal to the detection circuit 200. Accordingly, the detection circuit 200 can determine whether the lid is open or closed based on the received signals. Of course, for easier installation, the dual-wire magnetic induction circuit and the detection circuit 200 can be laid on two separate circuit boards. This makes the circuit board with the dual-wire magnetic induction circuit smaller and the placement of the dual-wire magnetic induction circuit inside the appliance more flexible. The dual-wire magnetic induction circuit and the detection circuit 200 can be connected by wires.

[0044] The fifth aspect of this utility model discloses another electrical appliance, which includes a main control board, a power supply for providing power to the main control board, a dual-wire magnetic induction sensor as described above, and a magnetic component movably disposed relative to the dual-wire magnetic induction sensor; the main control board is provided with a detection circuit 200 for the magnetic induction sensor as described above, and the main control board is provided with connection sockets respectively connected to the power supply and the I / O port, the power supply wire and the detection wire are connected to the connection sockets to power the dual-wire magnetic induction sensor and transmit detection signals; The detection circuit 200 determines whether the magnetic component is close to or far from the dual-line magnetic induction sensor based on the detection signal output by the dual-line magnetic induction sensor.

[0045] In this embodiment, the dual-wire magnetic induction sensor can be installed inside the appliance by screws or adhesive, which provides flexible installation and a more robust and reliable structure. The detection circuit 200 is located on the main control board of the appliance, and the power supply provides power to the detection circuit 200. By setting a connection socket on the main control board, when installing the dual-wire magnetic induction sensor, it is only necessary to plug the power supply wire and the detection wire into the connection socket to enable the dual-wire magnetic induction sensor to obtain power and communicate. The installation is relatively simple, and the connection socket is a two-position socket, which is smaller than a three-position socket, effectively saving space inside the appliance and on the main control board.

[0046] 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.

[0047] 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 magnetic induction sensor circuit, characterized in that, include: A magnetic induction chip, comprising a first voltage input port, a first ground port, and a signal output port; the first voltage input port is used to connect to an external power supply. A push-pull circuit includes a first input terminal, a second input terminal, a control terminal, and an output terminal. The first input terminal is connected to a first voltage input port, the second input terminal is connected to a first ground port, the control terminal is connected to a signal output port, and the first ground port is connected to the output terminal through a first voltage divider resistor. The output terminal is used to output a detection signal to an external detection circuit.

2. The dual-wire magnetic induction sensor circuit according to claim 1, characterized in that, The magnetic induction chip outputs a first signal and a second signal at its output port. The push-pull circuit connects the first input terminal to the output terminal and disconnects the second input terminal from the output terminal according to the first signal. The push-pull circuit connects the second input terminal to the output terminal and disconnects the first input terminal from the output terminal according to the second signal.

3. The dual-wire magnetic induction sensor circuit according to claim 1, characterized in that, The push-pull circuit includes a first transistor and a second transistor; the drain of the first transistor is the first input terminal, the source of the second transistor is the second input terminal, the gate of the first transistor and the gate of the second transistor are connected as the control terminal, and the source of the first transistor and the drain of the second transistor are connected as the output terminal.

4. The dual-wire magnetic induction sensor circuit according to claim 3, characterized in that, The first transistor is an NMOS transistor, and the second transistor is a PMOS transistor.

5. The dual-wire magnetic induction sensor circuit according to claim 1, characterized in that, The magnetic induction chip is a Hall chip, TMR chip, AMR chip, or GMR chip.

6. The dual-wire magnetic induction sensor circuit according to claim 1, characterized in that, It also includes a capacitor, one end of which is connected to the first voltage input port and the other end of which is connected to the first ground port.

7. A dual-wire magnetic induction sensor, characterized in that, The device includes a sensor housing, a circuit board, a power supply wire, and a detection wire. The circuit board is equipped with a dual-wire magnetic induction sensor circuit as described in any one of claims 1-6. The power supply wire is connected to the first voltage input port for connecting to a power supply. The detection wire is connected to the output terminal for outputting a detection signal. The circuit board is installed inside the sensor housing.

8. A detection circuit for a magnetic induction sensor, characterized in that, The detection circuit is used to detect the detection signal output by the dual-wire magnetic induction sensor circuit according to any one of claims 1-6. The detection circuit includes a detection chip and a second voltage divider resistor. The detection chip has a second voltage input port, an I / O port, and a second ground port. The second voltage input port is used to connect to an external power supply, and the I / O port is connected to the output terminal. One end of the second voltage divider resistor is connected to the I / O port, and the other end is connected to the second ground port. The second ground port is connected to a reference ground.

9. An electrical appliance, characterized in that, The electrical appliance has a dual-wire magnetic induction sensor circuit as described in any one of claims 1-6 and a detection circuit for a magnetic induction sensor as described in claim 8; the electrical appliance is further equipped with a magnetic component that is movably disposed relative to the magnetic induction chip, and the detection circuit determines whether the magnetic component is close to or far from the magnetic induction chip based on the detection signal output by the dual-wire magnetic induction sensor circuit.

10. An electrical appliance, characterized in that, The electrical component includes a main control board, a power supply for providing power to the main control board, a dual-wire magnetic induction sensor as described in claim 7, and a magnetic component movably disposed relative to the dual-wire magnetic induction sensor; the main control board is provided with a detection circuit for the magnetic induction sensor as described in claim 8, and the main control board is provided with connection sockets respectively connected to the power supply and the I / O port, the power supply wire and the detection wire are connected to the connection sockets to power the dual-wire magnetic induction sensor and transmit detection signals; The detection circuit determines whether the magnetic component is close to or far from the dual-wire magnetic induction sensor based on the detection signal output by the dual-wire magnetic induction sensor.

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