A Hall effect proximity switch

Abstract

This utility model relates to the field of proximity switch technology and discloses a Hall effect proximity switch, including a switch body with a circuit board inside; a Hall chip U1 is provided on the circuit board; a capacitor C is connected to the VCC pin of the Hall chip U1; the GND pin of the Hall chip U1 is grounded and forms a first terminal; a resistor R is connected to the OUT pin of the Hall chip U1; and the other end of R forms a second terminal; the first and second terminals are used to provide signal transmission to the Hall chip U1; this allows the product to directly incorporate a Hall effect proximity switch into the existing two-wire circuit without modifying the circuit, greatly saving manpower and resources.

Description

Technical Field

[0001] This utility model relates to the field of proximity switch technology, and specifically to a Hall effect proximity switch. Background Technology

[0002] A Hall effect proximity switch detects the approach of a magnetic object by generating a potential difference across its two ends when a current-carrying metal or semiconductor sheet is placed perpendicularly in a magnetic field. When a magnetic object approaches the switch, the magnetic field acts on the Hall element, causing it to generate a Hall potential. After processing by the circuit, an electrical signal is output, thus detecting the object's proximity. When the magnetic object moves away, the magnetic field disappears, the Hall element no longer generates a Hall potential, and the switch returns to its initial state.

[0003] The following problems exist in the current market: current Hall effect proximity switches are generally three-wire type, so when connecting the Hall effect proximity switch to the product circuit, the circuit needs to be adjusted to meet the three-wire connection requirements; the convenience and adaptability are poor.

[0004] The technical problem to be solved by this utility model is to provide a two-wire Hall proximity switch. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a two-wire Hall proximity switch, which allows the Hall proximity switch to be directly introduced into the original two-wire circuit without modifying the circuit, thus greatly saving manpower and resources.

[0006] A Hall effect proximity switch includes a switch body, and a circuit board is provided inside the switch body; a Hall chip U1 is provided on the circuit board; a capacitor C is connected to the VCC pin of the Hall chip U1; the GND pin of the Hall chip U1 is grounded and forms a first terminal; a resistor R is connected to the OUT pin of the Hall chip U1; and the other end of R forms a second terminal; the first terminal and the second terminal are used to provide signal transmission to the Hall chip U1.

[0007] Preferably, the first line terminal is connected to resistors R1 and R2; resistor R1 is connected to an external power supply; the other end of resistor R2 is connected to an external MCU; and capacitor C1 is connected between the first line terminal and the second line terminal.

[0008] Preferably, one end of the switch body is provided with a cable that is electrically connected to the circuit board; and the other end of the cable is electrically connected to a terminal.

[0009] Preferably, the terminal is a P-type terminal.

[0010] Compared with the prior art, the beneficial effects of this utility model are: the Hall effect proximity switch of this utility model allows the product to be directly introduced into the original two-wire circuit without modifying the circuit, which greatly saves manpower and resources.

[0011] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the Hall chip circuit of this utility model.

[0016] Figure 4 This is a schematic diagram of the Hall chip in actual application circuit of this utility model.

[0017] In the diagram: 1. Switch body; 2. Circuit board; 3. Cable; 4. Terminal. Detailed Implementation

[0018] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] It should be noted that the terms "first," "second," etc., used in this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with this disclosure.

[0020] Please see Figures 1-4 In this embodiment of the present invention, a Hall effect proximity switch includes a switch body 1; a circuit board 2 is provided inside the switch body 1; a Hall effect chip U1 is provided on the circuit board 2; a capacitor C is connected to the VCC pin of the Hall effect chip U1; the GND pin of the Hall effect chip U1 is grounded and forms a first terminal; a resistor R is connected to the OUT pin of the Hall effect chip U1; and the other end of R forms a second terminal; the first terminal and the second terminal are used to provide signal transmission to the Hall effect chip U1.

[0021] Specifically, the Hall chip U1 on circuit board 2 is a key component that uses the Hall effect to sense and detect magnetic fields. The VCC pin of the Hall chip U1 is connected to capacitor C, which acts as a filter and stabilizes the voltage. During power supply, voltage fluctuations and noise interference may occur. Capacitor C can absorb these unstable factors and provide a relatively stable operating voltage for the Hall chip U1, ensuring that the Hall chip U1 can work normally. The GND pin of the Hall chip U1 is grounded and forms the first terminal, providing a stable reference potential for the entire circuit. This allows the Hall chip U1 to operate in a relatively stable potential environment, ensuring its reliability and stability.

[0022] The OUT pin of Hall chip U1 is connected to resistor R, which serves to limit current and adjust the signal. When Hall chip U1 detects a change in magnetic field and generates a corresponding electrical signal, it outputs the signal through the OUT pin. Resistor R limits the output current to prevent excessive current from damaging subsequent circuits. It also allows for appropriate adjustment of parameters such as the amplitude of the output signal, making it more suitable for transmission and processing by subsequent circuits. The other end of R forms a second terminal. The first and second terminals together constitute the signal transmission channel of Hall chip U1. The first terminal provides a stable reference potential, while the second terminal is responsible for transmitting the signal processed by Hall chip U1 so that it can be received and processed by external control circuits or other devices, thereby realizing the detection and corresponding control functions of changes in external magnetic field. This circuit design simplifies the Hall proximity switch from a three-wire connection to a two-wire connection, better meeting the needs of electronic products and avoiding the hassle of modifying the circuit to connect the Hall switch.

[0023] Furthermore, the first line terminal is connected to resistors R1 and R2; resistor R1 is connected to an external power supply; the other end of resistor R2 is connected to an external MCU; and capacitor C1 is connected between the first line terminal and the second line terminal.

[0024] Specifically, the first terminal, serving as a crucial port formed by grounding the Hall chip U1, connects resistors R1 and R2. Resistor R1 is connected to the external power supply, serving a dual function of voltage division and current limiting. On one hand, the voltage provided by the external power supply may be too high to be directly connected to other parts of the circuit; resistor R1, through voltage division, adjusts the voltage to a suitable level, providing a stable operating voltage for subsequent circuits. On the other hand, it limits the current flowing into the circuit from the power supply, preventing excessive current from damaging circuit components and ensuring safe circuit operation. The other end of resistor R2 is connected to the external MCU (Microcontroller Unit), playing a key role in signal matching. After a series of processing steps, the signal generated by the Hall chip U1 is transmitted through the first terminal. Resistor R2 adjusts the signal to an amplitude and level range suitable for the external MCU to receive and process. This ensures that the MCU can accurately read and interpret the signal from the Hall chip U1, thereby enabling accurate judgment and corresponding control operations based on changes in magnetic fields, etc. Capacitor C1... It mainly serves to filter and stabilize signals. During signal transmission, various electromagnetic interferences and noises may occur, causing signal fluctuations and distortions. Capacitor C1 can effectively filter out these high-frequency interference signals, making the transmitted signal purer and more stable. At the same time, it can also compensate for phase differences and other issues during signal transmission to a certain extent, further improving the quality and reliability of the signal.

[0025] Furthermore, one end of the switch body 1 is provided with a cable 3 that is electrically connected to the circuit board 2; and the other end of the cable 3 is electrically connected to a terminal 4.

[0026] Specifically, the cable 3 and its connected terminal 4 at one end of the switch body 1 provide a physical connection channel for the interaction between the entire switch and external devices; the cable 3 and the circuit board 2 form an electrical connection, which carries the task of transmitting the electrical signals generated and processed by the Hall chip U1 and related circuits on the circuit board 2.

[0027] Furthermore, terminal 4 is a P-type terminal.

[0028] 1. When powered on, the external 5V power supply charges the capacitor C of Vcc through resistor R1, resistor R, and the diode between out and vcc inside Hall chip U1.

[0029] 2. After Vcc rises to the Hall working voltage, the Hall starts to work and detects the external magnetic field; when there is no magnetic field, the Hall does not activate and OUT outputs a high-level signal; when there is a magnetic field, the Hall activates and outputs a low-level signal.

[0030] 3. The external resistor R1 can be 10KΩ, the resistor R2 can be 1kΩ~10kΩ; the capacitor C1 can be 100nF~1uF.

[0031] 4. Hall chip U1 can use existing low-power omnipolar Hall to avoid magnetic polarity differences;

[0032] 5. Sensitivity is selected based on the required sensing distance and magnetic field strength of the magnet, generally between 25 and 45 GS. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A Hall effect proximity switch, comprising a switch body (1), characterized in that, The switch body (1) has a circuit board (2) inside; and a Hall chip U1 is provided on the circuit board (2); and a capacitor C is connected to the VCC pin of the Hall chip U1; and the GND pin of the Hall chip U1 is grounded and forms a first line terminal; and a resistor R is connected to the OUT pin of the Hall chip U1; and the other end of R forms a second line terminal; and the first line terminal and the second line terminal are used to provide signal transmission to the Hall chip U1.

2. A Hall effect proximity switch according to claim 1, characterized in that, The first line terminal is connected to resistors R1 and R2; resistor R1 is connected to an external power supply; the other end of resistor R2 is connected to an external MCU; and capacitor C1 is connected between the first line terminal and the second line terminal.

3. A Hall effect proximity switch according to claim 1, characterized in that, One end of the switch body (1) is provided with a cable (3) that is electrically connected to the circuit board (2); and the other end of the cable (3) is electrically connected to a terminal (4).

4. A Hall effect proximity switch according to claim 3, characterized in that, Terminal (4) is a P-type terminal.

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