Hall rotating speed sensor application circuit

Abstract

The utility model relates to a Hall rotating speed sensor, in particular to a Hall rotating speed sensor application circuit. The device comprises a power supply module, a filtering module, a Hall sensing module, a signal processing module and an output interface module. Wherein the power supply module is connected with the input of the filtering module, the output of the filtering module is connected with the Hall sensing module, the Hall sensing module is connected with the input of the signal processing module, and the output of the signal processing module is connected with the output interface module. The overall cost of the Hall rotating speed sensor can be reduced, the circuit reliability is improved, fault points are reduced, and the risk of electromagnetic interference is reduced; and through the design of the two Hall elements, the reliability of the Hall rotation speed sensor is improved, the measurement precision and the anti-interference capability are improved, and the phenomena of tooth loss and signal loss are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to hall rotation speed sensor, especially a kind of hall rotation speed sensor application circuit. BACKGROUND

[0002] The existing hall rotation speed sensor application circuit is mostly single channel, the output signal of the hall element used in the circuit is mostly sine wave, and the circuit composition is quite complex, including DC power supply, power supply protection circuit, hall inductor, differential amplifier circuit, high-pass filter, Schmidt trigger and output interface circuit.Hall inductor outputs sine wave by sensing magnetic field change, then the tiny signal input is amplified by amplifier circuit, the signal after amplification is filtered, then the sine wave signal is converted into square wave signal by Schmidt trigger, and finally output through output interface circuit.But at present, there are two problems in hall rotation speed sensor application circuit.

[0003] Firstly, the output of the hall inductive element applied in the existing circuit is mostly sine wave signal, and the signal processing circuit is complex, which not only increases the fault point, improves the risk of electromagnetic interference, but also leads to high overall production cost.

[0004] Secondly, the existing hall rotation speed sensor application circuit is mostly single-channel input and output, which reduces reliability, limits measurement accuracy, and has relatively weak anti-interference ability, and is prone to phenomena such as tooth loss and signal loss. SUMMARY

[0005] The utility model provides a kind of hall rotation speed sensor application circuit to the defects existing in prior art.

[0006] To achieve the above object, the utility model adopts the following technical scheme, a kind of hall rotation speed sensor application circuit, including with power module, filter module, hall induction module, signal processing module, output interface module;Wherein, the input of power module is connected with filter module, the output of filter module is connected with hall induction module, the input of hall induction module is connected with signal processing module, the output of signal processing module is connected with output interface module.

[0007] Further, power module is used to provide stable working voltage for hall induction module.

[0008] Filter module is used to smooth the voltage of power module and filter out alternating component.

[0009] Hall induction module is used to perceive magnetic field change and output current signal, including hall element U3 and hall element U4.

[0010] Signal processing module is used to convert the current signal output by hall element in hall induction module into voltage signal.

[0011] The output interface module comprises a capacitor C4 and a capacitor C6.

[0012] Further, the power module comprises a voltage stabilizing diode D1, a Schottky diode D2 and a voltage stabilizing chip U1; wherein the voltage stabilizing diode D1 is connected between the power supply VCC and the GND; the Schottky diode D2 is connected between the power supply VCC and the input end of the voltage stabilizing chip U1; the input end IN of the voltage stabilizing chip U1 is connected with the Schottky diode D2, the output end OUT of the voltage stabilizing chip U1 is connected with the filter module; and the ground end GND of the voltage stabilizing chip U1 is grounded.

[0013] Further, the filter module comprises a capacitor C1 and a capacitor C2, which are connected in parallel between the output end OUT and the ground end GND of the voltage stabilizing chip U1.

[0014] Further, the Hall element U3 and the Hall element U4 of the Hall induction module are respectively connected to the output end of the filter module and the input end of the signal processing circuit.

[0015] Further, the first terminals of the Hall element U3 and the Hall element U4 are both connected to the output of the filtered power module; the second terminal of the Hall element U3 is divided into two paths, wherein the first path is connected to the non-inverting input end of the voltage comparator U2A, and the second path is connected to the ground end through the resistor R1; the second terminal of the Hall element U4 is divided into two paths, wherein the first path is connected to the non-inverting input end of the voltage comparator U2B, and the second path is connected to the ground end through the resistor R4.

[0016] Further, the signal processing module comprises capacitors C3 and C5, resistors R2 and R3 connected in series, a resistor R5 and a resistor R6; wherein the capacitor C3 is connected in parallel on both sides of the resistor R1, and the capacitor C5 is connected in parallel on both sides of the resistor R4; one end of the resistor R2 is connected with one end of the resistor R3, the other end of the resistor R2 is connected to the input end of the voltage stabilizing chip U1, and the other end of the resistor R3 is grounded; the reverse input end of the voltage comparator U2A is connected with the reverse input end of the voltage comparator U2B, and then connected to the common point of the series connection of the resistors R2 and R3; one end of the resistor R5 is connected with the power supply VCC, and one end of the resistor R5 is connected with the output end of the voltage comparator U2A; one end of the resistor R6 is connected with the power supply VCC, and one end of the resistor R6 is connected with the output end of the voltage comparator U2B.

[0017] Further, the capacitor C4 of the output interface module is connected in parallel between the output end of the voltage comparator U2A and the ground, and the capacitor C6 of the output interface module is connected in parallel between the output end of the voltage comparator U2B and the ground.

[0018] Compared with the prior art, the utility model has the advantages of the following.

[0019] The utility model discloses a hall element and its application circuit's design can reduce the cost of hall rotation speed sensor whole, and improve circuit reliability, reduce the risk of failure point and reduce electromagnetic interference, and the design of two hall elements can make hall rotation speed sensor increase reliability, improve measurement accuracy and anti -interference ability, avoid the phenomenon of tooth loss and signal loss. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model makes further explanation to the following combining with the specific embodiment and the drawing. The utility model protection scope is not only limited to the following content's expression.

[0021] Fig. 1 It is hall rotation speed sensor application circuit block diagram.

[0022] Fig. 2 It is hall rotation speed sensor application circuit's circuit diagram.

[0023] Fig. 3 It is the structure diagram of hall rotation speed sensor in embodiment 2. SPECIFIC EMBODIMENT

[0024] In order to make the purpose, technical scheme and beneficial effect of the utility model embodiment more clear, the following will combine the drawing in the utility model embodiment, and the technical scheme in the utility model embodiment is clearly and completely described, obviously, the described embodiment is a part of the utility model embodiment, instead of all the embodiment.

[0025] As Figs. 1-3 The specific embodiment is shown, and the hall rotation speed sensor application circuit includes power module 1, filter module 2, hall induction module 3, signal processing module 4, output interface module 5;Among them, the input of power module 1 is connected with filter module 2, the output of filter module 2 is connected with hall induction module 3, the input of hall induction module 3 is connected with signal processing module 4, and the output of signal processing module 4 is connected with output interface module 5.

[0026] Preferably, power module 1 is used for providing stable working voltage for hall induction module 3;Filter module 2 is used for smoothing the voltage of power module 1 and filtering out the alternating component;Hall induction module 3 is used for sensing the magnetic field change and outputting current signal, including hall element U3 and hall element U4;Signal processing module 4 is used for converting the current signal output by the hall element in hall induction module 3 into voltage signal;Output interface module 5 includes capacitor C4 and capacitor C6.

[0027] Preferably, the power module 1 comprises a voltage stabilizing diode D1, a Schottky diode D2 and a voltage stabilizing chip U1; wherein the voltage stabilizing diode D1 is connected between the power supply VCC and GND; the Schottky diode D2 is connected between the power supply VCC and the input end of the voltage stabilizing chip U1; the input end IN of the voltage stabilizing chip U1 is connected with the Schottky diode D2, the output end OUT of the voltage stabilizing chip U1 is connected with the filter module 2; and the ground end GND of the voltage stabilizing chip U1 is grounded.

[0028] Preferably, the filter module 2 comprises a capacitor C1 and a capacitor C2, which are connected in parallel between the output end OUT and the ground end GND of the voltage stabilizing chip U1.

[0029] Preferably, the Hall elements U3 and U4 of the Hall induction module 3 are respectively connected between the output end of the filter module 2 and the input end of the signal processing circuit.

[0030] Preferably, the first terminals of the Hall elements U3 and U4 are both connected to the output of the filtered power module 1; the second terminal of the Hall element U3 is divided into two paths, wherein the first path is connected to the non-inverting input end of the voltage comparator U2A, and the second path is connected to the ground end through the resistor R1; the second terminal of the Hall element U4 is divided into two paths, wherein the first path is connected to the non-inverting input end of the voltage comparator U2B, and the second path is connected to the ground end through the resistor R4.

[0031] Specifically, the U1 model is: L7818, the U2A model is: LM339, the U2B model is: LM339, the U3 model is: CH506, and the U4 model is: CH506. The Hall element U3 is connected in series in the circuit, the pin 1 is the positive electrode of the Hall element connected to the upper end of the capacitor C2, and the pin 2 is the negative electrode of the Hall element connected to the upper end of the resistor R1. The Hall element U4 is connected in series in the circuit, the pin 1 is the positive electrode of the Hall element connected to the upper end of the capacitor C2, and the pin 2 is the negative electrode of the Hall element connected to the upper end of the resistor R4.

[0032] Preferably, the signal processing module 4 comprises capacitors C3 and C5, resistors R2 and R3 connected in series, a resistor R5, and a resistor R6; wherein the capacitor C3 is connected in parallel on both sides of the resistor R1, and the capacitor C5 is connected in parallel on both sides of the resistor R4; one end of the resistor R2 is connected to one end of the resistor R3, the other end of the resistor R2 is connected to the input end of the voltage stabilizing chip U1, and the other end of the resistor R3 is grounded; the reverse input end of the voltage comparator U2A is connected to the reverse input end of the voltage comparator U2B, and then connected to the common point of the series connection of the resistors R2 and R3; one end of the resistor R5 is connected to the power supply VCC, and one end of the resistor R5 is connected to the output end of the voltage comparator U2A; one end of the resistor R6 is connected to the power supply VCC, and one end of the resistor R6 is connected to the output end of the voltage comparator U2B.

[0033] Preferably, the capacitor C4 of the output interface module 5 is connected in parallel between the output of the voltage comparator U2A and the ground; the capacitor C6 of the output interface module 5 is connected in parallel between the output of the voltage comparator U2B and the ground.

[0034] The Hall speed sensor application circuit of the utility model provides stable working voltage and filters out alternating component, ensures that even in the case of input voltage fluctuation, the Hall element can work in pure and stable voltage environment, thereby greatly improving the stability and reliability of the system. The signal processing module converts the weak current signal output by the Hall induction module into a voltage signal easier to process, and amplifies and filters through precisely configured resistors, capacitors and other elements, improves the signal quality and signal-to-noise ratio, and makes the magnetic field change information more accurate and clear. The output interface module adopts a standard electrical connection method, which facilitates maintenance and upgrading. In addition, the voltage stabilizing chip U1 of the circuit ensures the stability of the output voltage while reducing the overall power consumption, which is suitable for the requirements of long-time running equipment.

[0035] Embodiment 1, the power module 1 includes a voltage stabilizing diode D1, a Schottky diode D2 and a voltage stabilizing chip U1.

[0036] The function of the voltage stabilizing diode D1 is to stabilize the voltage.

[0037] The function of the Schottky diode D2 is to prevent reverse voltage from damaging components.

[0038] The function of the voltage stabilizing chip U1 is to convert and stabilize the DC power supply voltage, and provide the required working voltage for each module inside the sensor.

[0039] The filter module 2 includes a capacitor C1 and a capacitor C2.

[0040] The function of the capacitor C1 and the capacitor C2 is to smooth the voltage and filter out the alternating component.

[0041] The Hall induction module 3 includes a Hall element U3 and a Hall element U4.

[0042] The function of the Hall element U3 and the Hall element U4 is to perceive the change of the magnetic field, thereby outputting a current signal.

[0043] The signal processing module 4 includes resistors R1 and R4, capacitors C3 and C5, resistors R2 and R3, a voltage comparator U2, resistors R5 and R6.

[0044] The function of the resistors R1 and R4 is to convert the current signal output by the Hall into a voltage signal.

[0045] The function of the capacitors C3 and C5 is to smooth the voltage, filter out the alternating component and act as a decoupling function.

[0046] The function of resistors R2 and R3 is to provide a reference voltage for the inverting input of voltage comparator U2.

[0047] The function of voltage comparator U2 is to output a square wave signal by comparing the voltages between points A / B and C. When the voltage at point A / B is less than the voltage at point C, voltage comparator U2 outputs a low level; when the voltage at point A / B is greater than the voltage at point C, voltage comparator U2 outputs a high level.

[0048] The function of resistors R5 and R6 is to act as pull-up resistors, providing a high-level signal for voltage comparator U2.

[0049] The output interface module 5 includes capacitors C4 and C6.

[0050] The function of capacitors C4 and C6 is to filter and improve the module's anti-interference capability.

[0051] Example 2: The Hall effect speed sensor includes a speed-measuring gear 6, a PCB board 7, Hall element 1 8, Hall element 2 9, permanent magnet 10, and permanent magnet 2 11. The working principle of the Hall effect speed sensor is as follows: The speed-measuring gear 6 should be made of a magnetically conductive material and should have an odd number of teeth. The PCB board 7 is placed on the central axis of the speed-measuring gear 6. Hall elements 1 8 and 2 9 have their pins soldered onto the PCB board 7. Permanent magnets 10 and 2 11 are placed on the back of Hall elements 1 8 and 2 9. When rotating, the tooth tips of the speed-measuring gear 6 must be positioned in the center of the front of either Hall element 1 8 or Hall element 2 9. Permanent magnets 10 and 2 11 generate magnetic fields. When the speed-measuring gear 6 rotates, it cuts magnetic field lines, causing a change in the magnetic field. Hall elements 1 8 and 2 9 sense this change in the magnetic field and output two sets of square wave current signals with a period difference of 1 / 2. These signals are then processed by the Hall effect speed sensor application circuit and output externally.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "preferred embodiment," "detailed description," or "preferred embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. 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.

[0053] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that; it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; therefore, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope defined by the claims of the present application.

Claims

1. A Hall speed sensor application circuit, characterized by: The application relates to a Hall speed sensor application circuit, which comprises a power module (1), a filter module (2), a Hall induction module (3), a signal processing module (4) and an output interface module (5). The input of the power module (1) is connected with the filter module (2), the output of the filter module (2) is connected with the Hall induction module (3), the input of the Hall induction module (3) is connected with the signal processing module (4), and the output of the signal processing module (4) is connected with the output interface module (5). The filter module (2) comprises capacitors C1 and C2, which are connected in parallel between the output end OUT of a voltage stabilizing chip U1 and a grounding end GND. The Hall elements U3 and U4 of the Hall induction module (3) are connected with the output end of the filter module (2) and the input end of a signal processing circuit respectively. The first terminals of the Hall elements U3 and U4 are connected with the output of the filtered power module (1). The second terminal of the Hall element U3 is divided into two paths, wherein the first path is connected with the non-inverting input end of a voltage comparator U2A, and the second path is connected with the grounding end through a resistor R1. The second terminal of the Hall element U4 is divided into two paths, wherein the first path is connected with the non-inverting input end of a voltage comparator U2B, and the second path is connected with the grounding end through a resistor R4.

2. The Hall speed sensor application circuit according to claim 1, characterized in that: The power module (1) is used for providing a stable working voltage for the Hall induction module (3); The filter module (2) is used for smoothing the voltage of the power module (1) and filtering out the alternating component; The Hall induction module (3) is used for sensing the magnetic field change and outputting a current signal, and comprises Hall elements U3 and U4; The signal processing module (4) is used for converting the current signal output by the Hall elements in the Hall induction module (3) into a voltage signal; The output interface module (5) comprises capacitors C4 and C6.

3. A Hall speed sensor application circuit according to claim 1, wherein: The power module (1) comprises a voltage stabilizing diode D1, a Schottky diode D2 and a voltage stabilizing chip U1, wherein, The voltage stabilizing diode D1 is connected between a power supply VCC and a grounding end GND; The Schottky diode D2 is connected between the power supply VCC and the input end of the voltage stabilizing chip U1; The input end IN of the voltage stabilizing chip U1 is connected with the Schottky diode D2, the output end OUT of the voltage stabilizing chip U1 is connected with the filter module (2), and the grounding end GND of the voltage stabilizing chip U1 is grounded.

4. A Hall speed sensor application circuit according to claim 1, characterized in that: The signal processing module (4) comprises capacitors C3 and C5, resistors R2 and R3 connected in series, a resistor R5, and a resistor R6; wherein the capacitor C3 is connected in parallel to both sides of the resistor R1, and the capacitor C5 is connected in parallel to both sides of the resistor R4; one end of the resistor R2 is connected to one end of the resistor R3, the other end of the resistor R2 is connected to the input end of the voltage stabilizing chip U1, and the other end of the resistor R3 is grounded; the reverse input end of the voltage comparator U2A is connected to the reverse input end of the voltage comparator U2B, and then connected to the common point of the series connection of the resistors R2 and R3; one end of the resistor R5 is connected to the power supply VCC, and the other end of the resistor R5 is connected to the output end of the voltage comparator U2A; one end of the resistor R6 is connected to the power supply VCC, and the other end of the resistor R6 is connected to the output end of the voltage comparator U2B.

5. A Hall speed sensor application circuit according to claim 3, wherein: The capacitor C4 of the output interface module (5) is connected in parallel between the output end of the voltage comparator U2A and the ground; and the capacitor C6 of the output interface module (5) is connected in parallel between the output end of the voltage comparator U2B and the ground.

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