Miniaturized voltage type output Hall circuit and circuit board

Abstract

The utility model provides a miniaturized voltage type output Hall circuit and a circuit board, comprising two channels, and each channel comprises an independent and complete Hall sensor circuit. Each channel comprises a magnetic induction chip, a power input and output end filter circuit and a power protection circuit; the magnetic induction chip, the power supply input and output end filter circuit and the power supply protection circuit are electrically connected in sequence; the two channels are electrically isolated; the magnetic induction chip is used for detecting the rotating speed of the detected gear; the filter circuit is used for filtering external electromagnetic interferences such as conducted interferences and radiated interferences; the power supply protection circuit is used for preventing interference caused by surge, fast pulse train and static electricity. According to the utility model, the circuit board is designed to be circular, the circuit area is reduced, the electrical isolation dual-channel design is adopted, the output voltage signal is stable, the vehicle speed measurement error caused by discontinuous signal output is reduced, and the operation stability and safety of the vehicle and a signal system are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of Hall circuit design, in particular to a miniaturized voltage-type output Hall circuit and a circuit board. Background Art

[0002] The wheel-axle Hall sensor is installed on the wheels of rail transit trains to measure the speed, direction, distance and other motion parameters of the wheel rotation.

[0003] The wheel-axle Hall sensor is non-contactly mounted on the side of the speed gear, with a gap between the Hall test surface and the outer edge of the speed gear. When the vehicle is running, the speed gear rotates, and the magnetic lines of force of the Hall chip magnetic element inside the Hall sensor cut the tooth top and tooth root on the side of the speed gear, outputting a pulse signal consistent with the number of gear teeth, which is used to calculate the wheel speed.

[0004] The Hall sensor circuit is composed of a magnetic induction chip, a driver, a filter device, a protective device, etc. Since there are some unstable factors in the power circuit, the circuit loop designed to prevent such unstable factors is called a protection circuit, such as overcurrent protection, overvoltage protection, etc. Circuit protection is mainly to protect the components in the electronic circuit from being damaged by overvoltage, overcurrent, surge, electromagnetic interference, etc. The current limiting and voltage limiting protection circuit plays a vital role in the reliability and service life of the integrated circuit.

[0005] At present, most of the protection of Hall pulse generating circuits adopts a simple resistor current limiting method, which cannot protect against overvoltage and voltage overshoot. In practical applications, overvoltage may occur due to unstable power supply voltage, thereby damaging the integrated circuit, reducing measurement reliability and affecting the stability and safety of vehicle operation.

[0006] In addition, the shape of the traditional Hall sensor circuit board on the market is rectangular, such as: size 55mmx13mm, area is about 715mm 2 The square circuit board takes up a lot of space, which brings great pressure to system design. Utility Model Content

[0007] In view of this, the purpose of the utility model is to design a miniaturized voltage-type output Hall circuit for a locomotive speed monitoring system, to solve the defects of the existing Hall speed sensor such as low measurement reliability, poor vehicle operation stability and safety due to unstable Hall circuit voltage, and to improve the reliability of rotation speed measurement.

[0008] The utility model provides a miniaturized voltage-type output Hall circuit, comprising two channels, each of which comprises an independent and complete Hall sensor circuit;

[0009] Each channel comprises: a magnetic induction chip, a power input and output filter circuit, and a power protection circuit; the magnetic induction chip, the power input and output filter circuit, and the power protection circuit are electrically connected in sequence;

[0010] The two channels are electrically isolated.

[0011] The magnetic induction chip is used to detect the rotation speed of the gear being tested;

[0012] The voltage stabilizing circuit is used to provide a stable voltage to the magnetic induction chip;

[0013] The filter circuit is used to filter out electromagnetic interference from the outside world, such as conducted interference and radiated interference, to maintain the stability of the power supply, and to provide standard voltage pulses to the external system;

[0014] The power protection circuit is used to protect against interference caused by surges, fast pulse groups, and static electricity.

[0015] The square wave pulse signal output by the miniaturized voltage-type output Hall circuit has a duty cycle of 50% and a phase difference of 90°, 120° or 60°.

[0016] Furthermore, the power input and output filter circuit includes: a diode D3, a diode D4, a capacitor C5, magnetic beads FB3, FB4, and a resistor R7. The diode D3 and the diode D4 are connected in parallel and then connected in series with the capacitor C5; the magnetic bead FB3 is connected in series at the front end of the parallel circuit of the diode D3 and the diode D4, and the magnetic bead FB4 is connected in series at the rear end of the parallel circuit of the diode D3 and the diode D4; the resistor R7 is connected in series between the capacitor C5 and the parallel circuit of the diode D3 and the diode D4.

[0017] The magnetic bead filter circuit uses the special properties of magnetic beads to filter out high-frequency noise and clutter signals in the circuit. Magnetic beads are a material with poor electrical properties. They have strong impedance to the transmission of high-frequency signals, so they can be used to make electronic filter circuits. When the signal passes through the magnetic beads, the high-frequency components are blocked and only the low-frequency components can pass. Therefore, the magnetic bead filter circuit can effectively filter out high-frequency noise and clutter signals, and improve the signal-to-noise ratio and performance of the circuit.

[0018] Furthermore, the power protection circuit includes: a TVS tube D2, a diode D1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a magnetic bead FB2, and a resistor R8. The TVS tube D2 is connected in series with the diode D1; the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4 and the diode D1 are connected in parallel, the magnetic bead FB2 is connected in series at the front end of the parallel circuit of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4 and the diode D1, and the resistor R8 is connected in series at the front end of the magnetic bead FB2.

[0019] The utility model also provides a circuit board of a miniaturized voltage-type output Hall circuit, which is manufactured according to the miniaturized voltage-type output Hall circuit as described above. The circuit board of the miniaturized voltage-type output Hall circuit includes: a sensing surface and a signal processing surface; the magnetic sensing chip and the filter circuit are arranged on the sensing surface; and the power supply protection circuit is arranged on the signal processing surface.

[0020] Furthermore, the sensing surface is arranged on the A surface of the circuit board of the miniaturized voltage-type output Hall circuit, and the signal processing surface is arranged on the B surface of the circuit board of the miniaturized voltage-type output Hall circuit.

[0021] Furthermore, the circuit board of the miniaturized voltage-type output Hall circuit is circular in shape, and the two channels of the miniaturized voltage-type output Hall circuit are respectively arranged on the left and right sides of the center line of the circle to form electrical isolation between input and output.

[0022] Furthermore, the diameter of the circuit board of the miniaturized voltage-type output Hall circuit is φ11-13 mm, preferably φ12 mm, and the area is 452 mm 2 , reducing the circuit area by more than one third compared to existing products.

[0023] Furthermore, the magnetic induction chip is arranged in a direction such that the length direction of the magnetic induction chip is perpendicular to the circular center line direction of the circuit board (ie, the magnetic induction chip is placed horizontally).

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The utility model discloses a miniaturized voltage-type output Hall circuit circuit designed to be circular in shape, which reduces the circuit area by more than one third compared with traditional products. A dual-channel Hall sensor circuit is designed with electrical isolation between channels. Through the design of filtering circuit and power supply protection circuit, a stable square wave pulse signal is output, which reduces the vehicle speed measurement error caused by discontinuous voltage signal output, ensures the operation stability and safety of the vehicle and signal system, improves the measurement reliability of the Hall speed sensor, and meets the requirements of the axle detection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those skilled in the art. The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0027] In the attached picture:

[0028] Figure 1 This is a schematic diagram of the structure of the A side of the circuit board of the miniaturized voltage-type output Hall circuit according to an embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram of the B-side structure of the circuit board of the miniaturized voltage-type output Hall circuit according to an embodiment of the utility model. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0031] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0032] It should be understood that although the terms first, second, and third may be used in the present disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0033] The embodiment of the utility model provides a miniaturized voltage-type output Hall circuit, comprising two channels, each of which comprises an independent and complete Hall sensor circuit;

[0034] Each channel comprises: a magnetic induction chip, a power input and output filter circuit, and a power protection circuit; the magnetic induction chip, the power input and output filter circuit, and the power protection circuit are electrically connected in sequence;

[0035] The two channels are electrically isolated.

[0036] The magnetic induction chip is used to detect the rotation speed of the gear being tested;

[0037] The voltage stabilizing circuit is used to provide a stable voltage to the magnetic induction chip;

[0038] The filter circuit is used to filter out electromagnetic interference from the outside world, such as conducted interference and radiated interference, to maintain the stability of the power supply, and to provide standard voltage pulses to the external system;

[0039] The power protection circuit is used to protect against interference caused by surges, fast pulse groups, and static electricity.

[0040] The power input and output filter circuit includes: a diode D3, a diode D4, a capacitor C5, magnetic beads FB3, FB4, and a resistor R7. The diode D3 and the diode D4 are connected in parallel and then connected in series with the capacitor C5; the magnetic bead FB3 is connected in series at the front end of the parallel circuit of the diode D3 and the diode D4, and the magnetic bead FB4 is connected in series at the rear end of the parallel circuit of the diode D3 and the diode D4; the resistor R7 is connected in series between the capacitor C5 and the parallel circuit of the diode D3 and the diode D4.

[0041] The magnetic bead filter circuit uses the special properties of magnetic beads to filter out high-frequency noise and clutter signals in the circuit. Magnetic beads are a material with poor electrical properties. They have strong impedance to the transmission of high-frequency signals, so they can be used to make electronic filter circuits. When the signal passes through the magnetic beads, the high-frequency components are blocked and only the low-frequency components can pass. Therefore, the magnetic bead filter circuit can effectively filter out high-frequency noise and clutter signals, and improve the signal-to-noise ratio and performance of the circuit.

[0042] The power protection circuit includes: a TVS tube D2, a diode D1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a magnetic bead FB2, and a resistor R8. The TVS tube D2 is connected in series with the diode D1; the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4 and the diode D1 are connected in parallel, the magnetic bead FB2 is connected in series at the front end of the parallel circuit of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4 and the diode D1, and the resistor R8 is connected in series at the front end of the magnetic bead FB2.

[0043] In this embodiment, the duty cycle of the square wave pulse signal output by the dual channels is 50% and the phase difference is 90°.

[0044] An embodiment of the utility model also provides a circuit board of a miniaturized voltage-type output Hall circuit, which is manufactured according to the miniaturized voltage-type output Hall circuit as described above. The circuit board of the miniaturized voltage-type output Hall circuit includes: a sensing surface and a signal processing surface; the magnetic sensing chip and the filter circuit are arranged on the sensing surface; and the power supply protection circuit is arranged on the signal processing surface.

[0045] See also Figure 1 , 2 As shown, the sensing surface is arranged on the A surface of the circuit board of the miniaturized voltage-type output Hall circuit, and the signal processing surface is arranged on the B surface of the circuit board of the miniaturized voltage-type output Hall circuit.

[0046] The circuit board of the miniaturized voltage-type output Hall circuit is circular in shape, and the two channels of the miniaturized voltage-type output Hall circuit are respectively arranged on the left and right sides of the center line of the circle to form electrical isolation between input and output.

[0047] In this embodiment, the diameter of the circuit board of the miniaturized voltage-type output Hall circuit is φ12 mm and the area is 452 mm 2 , reducing the circuit area by more than one third compared to existing products.

[0048] The miniaturized voltage-type output Hall circuit of the embodiment of the utility model designs the circuit board shape to be circular, which reduces the circuit area by more than one third compared with the existing products. A dual-channel Hall sensor circuit is designed with electrical isolation between the channels. Through the design of filtering circuit and power supply protection circuit, a stable square wave pulse signal is output, which reduces the vehicle speed measurement error caused by discontinuous voltage signal output, ensures the operation stability and safety of the vehicle and signal system, improves the measurement reliability of the Hall speed sensor, and meets the requirements of the axle detection system.

[0049] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the utility model.

[0050] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, replacement, and improvement made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A miniaturized voltage output Hall circuit, It is characterized in that It includes two channels, each channel contains an independent and complete Hall sensor circuit; Each channel comprises: a magnetic induction chip, a power input and output filter circuit, and a power protection circuit; the magnetic induction chip, the power input and output filter circuit, and the power protection circuit are electrically connected in sequence; The two channels are electrically isolated.

2. The miniaturized voltage-type output Hall circuit according to claim 1, It is characterized in that The power input and output filter circuit includes: a diode D3, a diode D4, a capacitor C5, magnetic beads FB3, FB4, and a resistor R7. The diode D3 and the diode D4 are connected in parallel and then connected in series with the capacitor C5; the magnetic bead FB3 is connected in series at the front end of the parallel circuit of the diode D3 and the diode D4, and the magnetic bead FB4 is connected in series at the rear end of the parallel circuit of the diode D3 and the diode D4; the resistor R7 is connected in series between the capacitor C5 and the parallel circuit of the diode D3 and the diode D4.

3. The miniaturized voltage-type output Hall circuit according to claim 1, It is characterized in that The power protection circuit includes: a TVS tube D2, a diode D1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a magnetic bead FB2, and a resistor R8. The TVS tube D2 is connected in series with the diode D1; the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4 and the diode D1 are connected in parallel, the magnetic bead FB2 is connected in series at the front end of the parallel circuit of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4 and the diode D1, and the resistor R8 is connected in series at the front end of the magnetic bead FB2.

4. A circuit board for a miniaturized voltage-type output Hall circuit, It is characterized in that According to the miniaturized voltage-type output Hall circuit as described in any one of claims 1 to 3, the circuit board of the miniaturized voltage-type output Hall circuit includes: a sensing surface and a signal processing surface; the magnetic sensing chip and the filter circuit are arranged on the sensing surface; and the power supply protection circuit is arranged on the signal processing surface.

5. The circuit board of the miniaturized voltage-type output Hall circuit according to claim 4, It is characterized in that The sensing surface is arranged on the A surface of the circuit board of the miniaturized voltage-type output Hall circuit, and the signal processing surface is arranged on the B surface of the circuit board of the miniaturized voltage-type output Hall circuit.

6. The circuit board of the miniaturized voltage-type output Hall circuit according to claim 4, It is characterized in that The circuit board of the miniaturized voltage-type output Hall circuit is circular in shape, and the two channels of the miniaturized voltage-type output Hall circuit are respectively arranged on the left and right sides of the center line of the circle to form electrical isolation between input and output.

7. The circuit board of the miniaturized voltage-type output Hall circuit according to claim 6, It is characterized in that The diameter of the circuit board of the miniaturized voltage-type output Hall circuit is φ12mm and the area is 452mm 2 .

8. The circuit board of the miniaturized voltage-type output Hall circuit according to claim 6, It is characterized in that The magnetic induction chip is arranged in a direction where the length direction of the magnetic induction chip is perpendicular to the circular center line direction of the circuit board.

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