C-slot high-reliability magnetic micro-distance sensor

Abstract

The utility model discloses a kind of C-type groove high-reliability magnetic sensitive micro-distance sensor, belong to sensor technical field, by setting polarity reverse connection protection unit, surge absorption protection unit, power filter unit, inductive driving unit and signal output unit on PCB, inductive driving unit can induct the magnetic ring on the magnetic field signal control signal output unit output magnetic field information corresponding electric signal of the movement of cylinder piston to preset inductive area, with multiple protection, high-reliability circuit that can adapt to harsh electrical environment, can clearly show state and facilitate observation, can effectively solve the deficiency of existing magnetic sensor in installation convenience, environmental adaptability and electrical reliability, improve the durability and reliability of magnetic sensitive micro-distance sensor in complex application scenario.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, and in particular relates to a C-groove high-reliability magnetic micro-sensing sensor. Background Technology

[0002] Existing cylinder magnetic sensors are typically cuboid in shape and fixed to the cylinder's mounting groove (such as a C-groove) using clamps. Their internal circuitry usually includes a magnetic sensing element (such as a Hall effect chip), signal processing circuitry, status indicator lights (LEDs), and basic protection circuitry. During installation, the sensor needs to be inserted into the C-groove of the cylinder and secured with screws and clamps. Although the cylinder magnetic sensor has basic protection at its base, in complex industrial environments (especially when using large inductive loads such as solenoid valves), voltage surges, reverse power connections, or induced surges in the cables can still damage the delicate internal sensing chip, affecting sensor lifespan and system reliability. Therefore, there is an urgent need to provide a high-reliability C-groove magnetic micro-sensor to address these problems. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a C-slot high-reliability magnetic micro-sensor with multiple protections, a highly reliable circuit capable of adapting to harsh electrical environments, clear status display, and easy observation. It effectively solves the shortcomings of existing magnetic sensors in terms of ease of installation, environmental adaptability, and electrical reliability.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a C-slot high-reliability magnetic micro-sensor, including a housing and a three-core cable disposed at one end of the housing. The three-core cable includes a power line and a signal line. A PCB board connected to the three-core cable is disposed inside the other end of the housing. The PCB board includes a polarity reverse connection protection unit, a surge absorption protection unit, a power filtering unit, a sensing drive unit, and a signal output unit. The polarity reverse connection protection unit, the surge absorption protection unit, and the power filtering unit are all connected to the power input terminal through the power line. The surge absorption protection unit, the polarity reverse connection protection unit, and the sensing drive unit are all connected to the power filtering unit. The polarity reverse connection protection unit is connected to the signal output unit, and the signal output unit is connected to the signal line. The induction drive unit is used to sense the magnetic field signal of the magnetic ring on the cylinder piston moving to a preset sensing area, and control the signal output unit to output the electrical signal corresponding to the magnetic field information.

[0005] As a preferred embodiment of the above technical solution, the sensing drive unit includes a sensor chip U1 and peripheral circuits. The power filtering unit and the peripheral circuits are both connected to the sensor chip U1, and the signal output unit and the polarity reverse connection protection unit are both connected to the peripheral circuits.

[0006] As a preferred embodiment of the above technical solution, the reverse polarity protection unit includes a diode D1, the anode of the diode D1 is connected to the positive terminal of the power input terminal, and the cathode of the diode D1 is connected to the power filtering unit and the signal output unit.

[0007] As a preferred embodiment of the above technical solution, the surge absorption protection unit includes a diode TVS1, which is connected in parallel between the anode of the diode D1 and the negative terminal of the power input terminal. The diode TVS1 is used to absorb instantaneous high-voltage surge pulse signals on the power line.

[0008] As a preferred embodiment of the above technical solution, the diode D1 is of type IPS79SB30 and the diode TVS1 is of type SMF4L30A.

[0009] As a preferred embodiment of the above technical solution, the power supply filtering unit includes capacitor C2 and capacitor C3. One end of capacitor C2 is connected to one end of capacitor C3, the cathode of diode D1, peripheral circuit, signal output unit, and sensor chip U1. The other end of capacitor C3 is connected to the other end of capacitor C2 and the negative terminal of the power input terminal and grounded. The power supply filtering unit is used to provide a stable operating voltage to the sensor chip U1.

[0010] As a preferred embodiment of the above technical solution, the PCB board further includes a status indication unit connected to the sensor chip U1. The status indication unit includes a resistor R3 and a diode D2. One end of the resistor R3 is connected to the sensor chip U1, and the other end of the resistor R3 is connected to the anode of the diode D2. The cathode of the diode D2 is grounded.

[0011] As a preferred embodiment of the above technical solution, the outer casing surface is further provided with a transparent window, which is used to display diode D2, wherein diode D2 is a red light-emitting diode.

[0012] As a preferred embodiment of the above technical solution, the peripheral circuit includes a resistor R1 and a capacitor C1, and the signal output unit includes a transistor Q1 and a resistor R2. One end of the resistor R1, one end of the capacitor C1, and the base of the transistor Q1 are connected to the sensor chip U1. The other end of the resistor R1 is connected to the cathode of the diode D1 and the emitter of the transistor Q1. The other end of the capacitor C1 is grounded. The collector of the transistor Q1 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the signal line.

[0013] As a preferred embodiment of the above technical solution, the sensor chip U1 is model TMR1355PD.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting up a polarity reverse connection protection unit, a surge absorption protection unit, a power supply filtering unit, an induction drive unit, and a signal output unit on the PCB board, the induction drive unit can sense the magnetic field signal of the magnetic ring on the cylinder piston moving to the preset sensing area. The control signal output unit outputs the electrical signal corresponding to the magnetic field information. It has multiple protections, a highly reliable circuit that can adapt to harsh electrical environments, and can clearly display the status and is easy to observe. It can effectively solve the shortcomings of existing magnetic sensors in terms of installation convenience, environmental adaptability, and electrical reliability, and improve the durability and reliability of magnetic micro-sensors in complex application scenarios. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the C-groove high-reliability magnetic micro-sensing sensor proposed in this utility model; Figure 2 This is a cross-sectional view of the C-groove high-reliability magnetic micro-sensor sensor proposed in this utility model; Figure 3 This is a structural block diagram of the PCB board proposed in this utility model; Figure 4 This is the circuit diagram of the PCB board proposed in this utility model.

[0016] The symbols for the main components are explained below: 10 - Housing; 20 - Three-core cable; 30 - Reverse polarity protection unit; 40 - Surge absorption protection unit; 50 - Power supply filtering unit; 60 - Induction drive unit; 70 - Signal output unit; 80 - Status indication unit; 90 - Transparent window. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] 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 are not intended to 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 a limitation of this utility model.

[0019] See Figure 1 , Figure 2 , Figure 3 and Figure 4 This utility model provides a C-slot high-reliability magnetic micro-sensor, including a housing 10 and a three-core cable 20 disposed at one end of the housing. The three-core cable 20 includes a power line and a signal line. A PCB board connected to the three-core cable 20 is disposed inside the other end of the housing 10. The PCB board includes a polarity reverse connection protection unit 30, a surge absorption protection unit 40, a power filtering unit 50, a sensing drive unit 60, and a signal output unit 70. The polarity reverse connection protection unit 30, the surge absorption protection unit 40, and the power filtering unit 50 are all connected to the power input terminal through the power line. The surge absorption protection unit 40, the polarity reverse connection protection unit 30, and the sensing drive unit 60 are all connected to the power filtering unit 50. The polarity reverse connection protection unit 30 is connected to the signal output unit 70, and the signal output unit 70 is connected to the signal line. The induction drive unit 60 is used to sense the magnetic field signal of the magnetic ring on the cylinder piston moving to a preset sensing area and control the signal output unit 70 to output the electrical signal corresponding to the magnetic field information.

[0020] In this embodiment, the sensing drive unit 60 includes a sensor chip U1 and peripheral circuitry. The power filtering unit 50 and the peripheral circuitry are both connected to the sensor chip U1. The signal output unit 70 and the reverse polarity protection unit 30 are both connected to the peripheral circuitry. The reverse polarity protection unit 30 includes a diode D1, with the anode of diode D1 connected to the positive terminal of the power input terminal, and the cathode of diode D1 connected to the power filtering unit 50 and the signal output unit 70. The surge absorption protection unit 40 includes a diode TVS1, which is connected in parallel between the anode of diode D1 and the negative terminal of the power input terminal. The diode TVS1 is used to absorb instantaneous high-voltage surge pulse signals on the power line. A transparent window 90 is also provided on the surface of the housing 10, which is used to display diode D2, wherein diode D2 is a red light-emitting diode. The PCB board also includes a status indication unit 80 connected to the sensor chip U1. The status indication unit 80 includes a resistor R3 and a diode D2. One end of the resistor R3 is connected to the sensor chip U1, and the other end of the resistor R3 is connected to the anode of the diode D2. The cathode of the diode D2 is grounded.

[0021] It should be noted that the diode D1 is an IPS79SB30, the diode TVS1 is an SMF4L30A, and the power supply filter unit 50 includes capacitors C2 and C3. One end of capacitor C2 is connected to one end of capacitor C3, the cathode of diode D1, the peripheral circuit, the signal output unit 70, and the sensor chip U1. The other end of capacitor C3 is connected to the other end of capacitor C2, the negative terminal of the power input, and grounded. The power supply filter unit 50 is used to provide a stable operating voltage to the sensor chip U1. The peripheral circuit includes resistor R1 and capacitor C1. The signal output unit 70 includes transistor Q1 and resistor R2. One end of resistor R1, one end of capacitor C1, and the base of transistor Q1 are connected to the sensor chip U1. The other end of resistor R1 is connected to the cathode of diode D1 and the emitter of transistor Q1. The other end of capacitor C1 is grounded. The collector of transistor Q1 is connected to one end of resistor R2, and the other end of resistor R2 is connected to the signal line. The sensor chip U1 is a TMR1355PD.

[0022] Specifically, this utility model provides a small, high-precision magnetic micro-sensor with a C-groove adapter, comprising two parts: a mechanical structure and a circuit system. The mechanical part: the sensor housing has an overall arc-shaped design, with its back near the cylinder mounting slot featuring a large-radius arc surface matching the C-groove. This arc-shaped housing is integrally injection molded from impact-resistant engineering plastic (such as PBT). A PCB board is encapsulated inside the arc-shaped housing. A three-core cable 20 (positive, negative, and signal output terminals) extends from one end of the housing 10. A transparent window 90 is provided on the surface of the housing 10 for observing the internal LED indicator. The circuit system: the circuit system is integrated onto a single PCB board, such as... Figure 3 and Figure 4 As shown, its specific structure and connection relationships are as follows: Power input terminals: labeled "positive (brown wire)" and "negative (blue wire)," connected to 10-30V. DC power supply; Reverse polarity protection unit 30 is implemented by diode D1 (model IPS798B30), whose anode is connected to the "positive terminal" of the power supply and the cathode is connected to the subsequent circuit; when the power supply is reversed, D1 is reverse cut off, effectively protecting the subsequent circuit from damage; Surge absorption protection unit 40 is implemented by transient voltage suppression diode TVS1 (model SMF4L30A), TVS1 is connected in parallel at the power input terminal (between the anode of D1 and the negative terminal of the power input terminal), used to absorb instantaneous high voltage surge pulses on the power line; Power supply filtering unit 50 is composed of capacitors C2 (10nF) and C3 (1uF), connected in parallel on the power line, used to filter out high frequency and low frequency power supply noise, and provide a stable and clean working voltage for the chip; Core sensing and driving unit (sensing driving unit 60) is composed of dedicated sensor chip U1 and its peripheral circuits. The VDD pin of (sensor chip) U1 is connected to the power supply, the GND pin is grounded, and the ISOURCE pin of U1 provides a constant current source for the magnetic sensing element (integrated internally, not shown in the figure) through resistor R1 (10K); After internal processing, the induced signal is output from the DRV-R pin to drive the signal indicator D2 (LED_R) and control the base (G) of the output transistor. Capacitor C1 (5nF) is connected to a specific pin of U1 (such as the filter or frequency setting pin) to stabilize the internal circuit operation. The status indicator unit 80 consists of a red light-emitting diode D2 (LED_R) and a current-limiting resistor R2 (100R) connected in series between the DRV-R pin of U1 and the positive power supply. When a magnetic field is detected, the DRV-R outputs current and lights up D2. The signal output unit 70 uses a PNP transistor output (marked as "PNP (black line)" in the figure). The emitter (S) of the transistor is connected to the positive power supply, the collector (D) is used as the signal output terminal, and the base (G) is controlled by the DRV-R pin of U1. When a magnetic field is detected, the transistor conducts and outputs a high level. The transistor Q1 is a BSS84AKW PNP transistor.

[0023] In practical applications, after the sensor is powered on, when the magnetic ring on the cylinder piston moves to the sensing area, the magnetic sensing element inside U1 senses the change in magnetic field, and U1 controls the output current of the DRV-R pin. This current illuminates the red LED (D2) for visual indication and drives the PNP transistor to saturate and conduct, thereby outputting a signal from the "PNP (black line)" terminal. By setting up a polarity reverse connection protection unit 30, a surge absorption protection unit 40, a power supply filtering unit 50, a sensing drive unit 60, and a signal output unit 70 on the PCB board, the sensing drive unit 60 can sense the magnetic field signal of the magnetic ring on the cylinder piston moving to the preset sensing area and control the signal output unit 70 to output the electrical signal corresponding to the magnetic field information. It has multiple protections, is a highly reliable circuit that can adapt to harsh electrical environments, can clearly display the status and is easy to observe. It can effectively solve the shortcomings of existing magnetic sensors in terms of installation convenience, environmental adaptability and electrical reliability, and improve the durability and reliability of magnetic micro-sensors in complex application scenarios.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A C-groove high-reliability magnetic micro-sensor, comprising a housing and a three-core cable disposed at one end of the housing, the three-core cable including a power line and a signal line, and a PCB board connected to the three-core cable disposed inside the other end of the housing, characterized in that, The PCB board includes a reverse polarity protection unit, a surge absorption protection unit, a power filtering unit, an induction drive unit, and a signal output unit. The reverse polarity protection unit, the surge absorption protection unit, and the power filtering unit are all connected to the power input terminal through the power line. The surge absorption protection unit, the reverse polarity protection unit, and the induction drive unit are all connected to the power filtering unit. The reverse polarity protection unit is connected to the signal output unit, and the signal output unit is connected to the signal line. The induction drive unit is used to sense the magnetic field signal of the magnetic ring on the cylinder piston moving to the preset sensing area and control the signal output unit to output the electrical signal corresponding to the magnetic field information.

2. The C-groove high-reliability magnetic micro-sensor according to claim 1, characterized in that, The sensing drive unit includes a sensor chip U1 and peripheral circuits. The power filtering unit and the peripheral circuits are both connected to the sensor chip U1. The signal output unit and the polarity reverse connection protection unit are both connected to the peripheral circuits.

3. The C-groove high-reliability magnetic micro-sensor according to claim 2, characterized in that, The reverse polarity protection unit includes a diode D1, the anode of which is connected to the positive terminal of the power input terminal, and the cathode of which is connected to the power filtering unit and the signal output unit.

4. The C-groove high-reliability magnetic micro-sensor according to claim 3, characterized in that, The surge absorption protection unit includes a diode TVS1, which is connected in parallel between the anode of the diode D1 and the negative terminal of the power input terminal. The diode TVS1 is used to absorb instantaneous high-voltage surge pulse signals on the power line.

5. The C-groove high-reliability magnetic micro-sensor according to claim 4, characterized in that, The diode D1 is an IPS79SB30, and the diode TVS1 is an SMF4L30A.

6. The C-groove high-reliability magnetic micro-sensor according to claim 5, characterized in that, The power filtering unit includes capacitor C2 and capacitor C3. One end of capacitor C2 is connected to one end of capacitor C3, the cathode of diode D1, the peripheral circuit, the signal output unit, and the sensor chip U1. The other end of capacitor C3 is connected to the other end of capacitor C2 and the negative terminal of the power input terminal and grounded. The power filtering unit is used to provide a stable operating voltage to the sensor chip U1.

7. The C-groove high-reliability magnetic micro-sensor according to claim 2, characterized in that, The PCB board also includes a status indication unit connected to the sensor chip U1. The status indication unit includes a resistor R3 and a diode D2. One end of the resistor R3 is connected to the sensor chip U1, and the other end of the resistor R3 is connected to the anode of the diode D2. The cathode of the diode D2 is grounded.

8. The C-slot high-reliability magnetic micro-sensor according to claim 7, characterized in that, The outer casing surface is also provided with a transparent window, which is used to display diode D2, wherein diode D2 is a red light-emitting diode.

9. The C-groove high-reliability magnetic micro-sensor according to claim 2, characterized in that, The peripheral circuit includes a resistor R1 and a capacitor C1. The signal output unit includes a transistor Q1 and a resistor R2. One end of the resistor R1, one end of the capacitor C1, and the base of the transistor Q1 are connected to the sensor chip U1. The other end of the resistor R1 is connected to the cathode of the diode D1 and the emitter of the transistor Q1. The other end of the capacitor C1 is grounded. The collector of the transistor Q1 is connected to one end of the resistor R2. The other end of the resistor R2 is connected to the signal line.

10. The C-slot high-reliability magnetic micro-sensor according to claim 2, characterized in that, The sensor chip U1 is model TMR1355PD.

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