Railway train noise remote automatic detection device

Abstract

The utility model discloses a railway train noise remote automatic detection device which comprises a power supply circuit, and a wireless transmission circuit, a signal acquisition circuit, a signal processing circuit and a storage clock circuit which are connected with the power supply circuit, and the signal processing circuit is connected with the signal acquisition circuit and the storage clock circuit. The signal processing circuit is connected with the signal acquisition circuit through an SPI interface, the signal acquisition circuit and the signal processing circuit are both connected with the wireless transmission circuit, and the signal acquisition circuit is provided with a plurality of filtering modules, so that high-precision acquisition of signals is realized; the signal processing circuit is provided with a primary filtering unit, an isolation unit, a variable gain amplification unit and a secondary filtering unit, distortion can be restrained to a low enough level, redundant noise in an amplifier is filtered out, the power supply circuit can provide stable voltage to guarantee collection stability and precision, collection difficulty is reduced, and noise detection precision and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, and particularly relates to a remote automatic detection device for railway train noise. Background Art

[0002] During railway operation, the most significant environmental impact is train noise pollution, which directly or indirectly endangers the physical and mental health of residents along the line, affects people's normal work and life, and becomes an environmental problem that cannot be ignored. The noise generated during the operation of railway trains directly affects the comfort and safety of passengers. When the existing devices are used for noise detection, during the process of obtaining noise data, they cannot collect noise data in real time and save it in the cloud platform through wireless data transmission.

[0003] Moreover, since the train is in operation, it will affect the acquisition function of the device, increasing the acquisition difficulty, resulting in a decrease in the subsequent signal processing accuracy and detection efficiency. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is that during train operation, the acquisition difficulty is large, the signal processing accuracy is reduced, and the detection efficiency is reduced. The purpose is to provide a remote automatic detection device for railway train noise. By setting up a wireless transmission circuit, a signal acquisition circuit, a signal processing circuit, a storage clock circuit and a power supply circuit, and setting multiple filtering modules in the signal acquisition circuit, high-precision signal acquisition is realized. The signal processing circuit is provided with a primary filtering unit, an isolation unit, a variable gain amplification unit and a secondary filtering unit, which can suppress distortion to a sufficiently low level and filter out the redundant noise in the amplifier. The power supply circuit can provide a stable voltage to ensure the stability and accuracy of the acquisition, reduce the acquisition difficulty, and improve the noise detection accuracy and efficiency.

[0005] The utility model is realized through the following technical solutions:

[0006] A remote automatic detection device for railway train noise includes a power supply circuit, and a wireless transmission circuit, a signal acquisition circuit, a signal processing circuit and a storage clock circuit connected to the power supply circuit;

[0007] The signal processing circuit is connected to the signal acquisition circuit and the storage clock circuit;

[0008] The signal processing circuit is connected to the signal acquisition circuit through an SPI interface;

[0009] The signal acquisition circuit and the signal processing circuit are both connected to the wireless transmission circuit;

[0010] The signal acquisition circuit includes a chip U1, and the input end of the chip U1 is connected to multiple filtering modules;

[0011] The signal processing circuit includes a primary filtering unit, an isolation unit, a variable gain amplification unit, and a secondary filtering unit connected in sequence;

[0012] The power supply circuit includes a filtering unit, an isolation unit, a rectifier bridge unit, and a DC-DC voltage stabilizing power supply unit connected in sequence.

[0013] Further, in the signal acquisition circuit, a resistor R12 is connected to pin 18 of chip U1;

[0014] A resistor R13 is provided between pin 19 and pin 20 of the chip U1;

[0015] Both ends of the resistor R13 are also connected to a capacitor C18 and a capacitor C19;

[0016] The capacitor C18 and the capacitor C19 are connected to one end of the principle resistor R13.

[0017] Further, the multiple filtering modules include:

[0018] The first filtering module: The capacitor C12 and the capacitor C13 are connected in parallel to form a first parallel branch. One end of the first parallel branch is connected to pin 3 of the chip U1, and the other end is grounded;

[0019] The second filtering module: The capacitor C14 and the capacitor C15 are connected in parallel to form a second parallel branch. One end of the second parallel branch is connected to pin 4 of the chip U1, and the other end is grounded;

[0020] The third filtering module: The capacitor C16 and the capacitor C17 are connected in parallel to form a third parallel branch. One end of the third parallel branch is connected to pin 12 of the chip U1, and the other end is grounded.

[0021] Further, the primary filtering unit includes: a variable resistor RV1, a resistor R1, and a resistor R2;

[0022] The isolation unit includes an isolation chip T1;

[0023] The variable resistor RV1, the resistor R1, and the resistor R2 are connected in sequence;

[0024] One end of the variable resistor RV1 far from the resistor R1 is connected to the input pin 2 of the isolation chip T1;

[0025] One end of the resistor R2 far from the resistor R1 is connected to the input pin 1 of the isolation chip T1.

[0026] Further, the variable gain amplification unit includes:

[0027] Resistor R6, resistor R7, resistor R8, resistor R9, capacitor C6, capacitor C7, capacitor C8, capacitor C9, variable resistor RV2, variable resistor RV3, variable resistor RV4, and amplifier A1;

[0028] One end of resistor R6 is connected to output pin 4 of isolation chip T1, and the other end of resistor R6 is connected to the inverting input terminal of amplifier A1;

[0029] One end of resistor R7 is connected to output pin 3 of isolation chip T1, and the other end of resistor R7 is connected to the non-inverting input terminal of amplifier A1;

[0030] Resistor R8 is connected to the non-inverting output terminal of amplifier A1, and resistor R7 is connected to the inverting output terminal of amplifier A9;

[0031] A capacitor C6 and a variable resistor RV3 are provided between the inverting input terminal and the non-inverting output terminal of amplifier A1;

[0032] A capacitor C6 and a variable resistor RV4 are provided between the non-inverting input terminal and the inverting output terminal of amplifier A1;

[0033] The end of resistor R8 far from amplifier A1 is connected to capacitor C8, and the other end of capacitor C8 is grounded;

[0034] The end of resistor R9 far from amplifier A1 is connected to capacitor C9, and the other end of capacitor C9 is grounded.

[0035] Further, the secondary filtering unit includes:

[0036] Resistor R10, resistor R11, capacitor C10, and capacitor C11;

[0037] Resistor R10 and capacitor C10 are connected in parallel to form a first parallel branch;

[0038] Resistor R11 and capacitor C11 are connected in parallel to form a second parallel branch;

[0039] One end of the first parallel branch is connected to resistor R8 and capacitor C8, and the other end is connected to the second parallel branch;

[0040] One end of the second parallel branch is connected to resistor R9 and capacitor C9.

[0041] Further, the filtering unit includes resistor RV1, resistor R3, and capacitor C1. Resistor RV1, resistor R3, and capacitor C1 are connected in sequence to form a closed loop;

[0042] The isolation unit includes isolation chip T2, and both ends of capacitor C1 are also connected to input pin 1 and input pin 2 of isolation chip T2.

[0043] Further, the rectifier bridge unit includes diodes D1 - D8, polarized capacitors C2, C3, resistors R4 and R5;

[0044] The diodes D1 - D4 are connected in series in turn to form a first branch;

[0045] The diodes D5 - D8 are connected in series in turn to form a second branch;

[0046] The connection point of the diodes D2 and D3 is connected to the output pin 4 of the isolation chip T2;

[0047] The connection point of the diodes D6 and D7 is connected to the output pin 3 of the isolation chip T2;

[0048] The polarized capacitors C2 and C3 are connected to form a third branch;

[0049] The resistors R4 and R5 are connected to form a fourth branch;

[0050] The first branch, the second branch, the third branch and the fourth branch are connected in parallel;

[0051] The polarized capacitors C2, C3, resistors R4 and R5 are connected to one point.

[0052] Further, the DC - DC regulated power supply unit includes chip U2, polarized capacitor C4 and capacitor C5;

[0053] Both ends of the polarized capacitor C4 are respectively connected to the positive and negative poles of the output pin of the chip U2;

[0054] Both ends of the capacitor C5 are respectively connected to the positive and negative poles of the output pin of the chip U2;

[0055] The two input ends of the chip U2 are respectively connected to one end of the resistor R4 far from the resistor R5 and one end of the resistor R5 far from the resistor R4.

[0056] Further, the chip U1 adopts the ADE7754 chip, the chip U2 adopts the MSH10S chip, and the chips T1 and T2 adopt the L_33MHD7 chip.

[0057] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0058] By setting up a wireless transmission circuit, a signal acquisition circuit, a signal processing circuit, a storage clock circuit, and a power supply circuit, and arranging multiple filtering modules in the signal acquisition circuit, high-precision signal acquisition is achieved. The signal processing circuit is provided with a primary filtering unit, an isolation unit, a variable gain amplification unit, and a secondary filtering unit, which can suppress distortion to a sufficiently low level and filter out excess noise in the amplifier. The power supply circuit can provide a stable voltage to ensure the stability and precision of acquisition, reduce the acquisition difficulty, and improve the noise detection precision and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0060] Figure 1 is the structure of the noise detection device in the embodiment of the present invention

[0061] Figure 2 is the circuit connection relationship in the embodiment of the present invention;

[0062] Figure 3 is the signal acquisition circuit in the embodiment of the present invention;

[0063] Figure 4 is the signal processing circuit in the embodiment of the present invention

[0064] Figure 5 is the power supply module circuit in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0065] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the embodiments and the drawings. The illustrative embodiments and descriptions thereof of the present invention are only used to explain the present invention and do not limit the present invention.

[0066] As a possible implementation, Embodiment 1 of the present invention provides a remote automatic railway train noise detection device, including a power supply circuit, and a wireless transmission circuit, a signal acquisition circuit, a signal processing circuit, and a storage clock circuit connected to the power supply circuit; as Figure 1 shown and Figure 2 shown, the signal processing circuit is connected to the signal acquisition circuit and the storage clock circuit; the signal processing circuit is connected to the signal acquisition circuit through an SPI interface; both the signal acquisition circuit and the signal processing circuit are connected to the wireless transmission circuit.

[0067] As Figure 3As shown, in the signal acquisition circuit, multiple filtering modules are set to obtain effective sampling signals. Specifically, through three-way filtering, the initially acquired signal is filtered and converted into a small current signal, achieving high-precision signal acquisition;

[0068] Specifically,

[0069] The signal acquisition circuit includes chip U1, and the input end of chip U1 is connected to multiple filtering modules;

[0070] Resistor R12 is connected to pin 18 of chip U1;

[0071] A resistor R13 is set between pin 19 and pin 20 of chip U1;

[0072] Capacitors C18 and C19 are also connected across both ends of resistor R13;

[0073] Capacitors C18 and C19 are connected to one end of resistor R13;

[0074] Among them, the multiple filtering modules include:

[0075] The first filtering module: Capacitors C12 and C13 are in parallel to form a first parallel branch. One end of the first parallel branch is connected to pin 3 of chip U1, and the other end is grounded;

[0076] The second filtering module: Capacitors C14 and C15 are in parallel to form a second parallel branch. One end of the second parallel branch is connected to pin 4 of chip U1, and the other end is grounded;

[0077] The third filtering module: Capacitors C16 and C17 are in parallel to form a third parallel branch. One end of the third parallel branch is connected to pin 12 of chip U1, and the other end is grounded.

[0078] As Figure 4 shown, in the signal processing circuit, a first-order low-pass filter is formed by connecting capacitors and variable resistors in parallel across both ends of amplifier A1, which is used to filter out the excess noise in the amplifier. Its bandwidth can ensure that while the output voltage is sufficient to be established, it also meets the operation of the circuit. The capacitors and resistors connected in series at the output end of amplifier A1 help to compensate for the internal poles of the operational amplifier, thereby increasing the loop bandwidth. At the same time, it can reduce the power consumption under a given phase margin. Through secondary filtering, the signal accuracy is further improved, and the distortion can be suppressed to a sufficiently low level;

[0079] Specifically,

[0080] The signal processing circuit includes a primary filtering unit, an isolation unit, a variable gain amplification unit, and a secondary filtering unit connected in sequence;

[0081] The primary filtering unit includes: variable resistor RV1, resistor R1, and resistor R2;

[0082] The isolation unit includes an isolation chip T1;

[0083] The variable resistor RV1, resistor R1, and resistor R2 are connected in sequence;

[0084] One end of the variable resistor RV1 far from the resistor R1 is connected to the input pin 2 of the isolation chip T1;

[0085] One end of the resistor R2 far from the resistor R1 is connected to the input pin 1 of the isolation chip T1.

[0086] The variable gain amplification unit includes:

[0087] Resistor R6, resistor R7, resistor R8, resistor R9, capacitor C6, capacitor C7, capacitor C8, capacitor C9, variable resistor RV2, variable resistor RV3, variable resistor RV4, and amplifier A1;

[0088] One end of the resistor R6 is connected to the output pin 4 of the isolation chip T1, and the other end of the resistor R6 is connected to the inverting input terminal of the amplifier A1;

[0089] One end of the resistor R7 is connected to the output pin 3 of the isolation chip T1, and the other end of the resistor R7 is connected to the non-inverting input terminal of the amplifier A1;

[0090] The resistor R8 is connected to the non-inverting output terminal of the amplifier A1, and the resistor R7 is connected to the inverting output terminal of the amplifier A9;

[0091] A capacitor C6 and a variable resistor RV3 are provided between the inverting input terminal and the non-inverting output terminal of the amplifier A1;

[0092] A capacitor C6 and a variable resistor RV4 are provided between the non-inverting input terminal and the inverting output terminal of the amplifier A1;

[0093] One end of the resistor R8 far from the amplifier A1 is connected to the capacitor C8, and the other end of the capacitor C8 is grounded;

[0094] One end of the resistor R9 far from the amplifier A1 is connected to the capacitor C9, and the other end of the capacitor C9 is grounded.

[0095] The secondary filtering unit includes:

[0096] Resistor R10, resistor R11, capacitor C10, and capacitor C11;

[0097] The resistor R10 and the capacitor C10 are connected in parallel to form a first parallel branch;

[0098] The resistor R11 and the capacitor C11 are connected in parallel to form a second parallel branch;

[0099] One end of the first parallel branch is connected to the resistor R8 and the capacitor C8, and the other end is connected to the second parallel branch;

[0100] One end of the second parallel branch is connected to resistor R9 and capacitor C9.

[0101] As Figure 5 shown, the power supply circuit is mainly responsible for providing the power supply for the entire device, collecting the AC voltage in the power grid and converting the voltage into a small signal for subsequent sampling, that is, converting the signal into a small voltage signal within the input range on the chip. Therefore, the power supply circuit can provide a stable voltage to ensure the stability and accuracy of the collection, reduce the collection difficulty, and improve the noise detection accuracy and efficiency.

[0102] Specifically, the power supply circuit includes a filtering unit, an isolation unit, a rectifier bridge unit, and a DC-DC voltage stabilizing power supply unit connected in sequence.

[0103] The filtering unit includes resistor RV1, resistor R3, and capacitor C1, and resistor RV1, resistor R3, and capacitor C1 are connected in sequence to form a closed loop;

[0104] The isolation unit includes isolation chip T2, and both ends of capacitor C1 are also connected to input pin 1 and input pin 2 of isolation chip T2.

[0105] The rectifier bridge unit includes diodes D1 - D8, polarized capacitors C2, C3, resistor R4, and resistor R5;

[0106] Diodes D1 - D4 are connected in series in sequence to form a first branch;

[0107] Diodes D5 - D8 are connected in series in sequence to form a second branch;

[0108] The connection point of diode D2 and diode D3 is connected to output pin 4 of isolation chip T2;

[0109] The connection point of diode D6 and diode D7 is connected to output pin 3 of isolation chip T2;

[0110] Polarized capacitors C2 and C3 are connected to form a third branch;

[0111] Resistors R4 and R5 are connected to form a fourth branch;

[0112] The first branch, the second branch, the third branch, and the fourth branch are in parallel;

[0113] Polarized capacitors C2, C3, resistor R4, and resistor R5 are connected to one point.

[0114] The DC-DC voltage stabilizing power supply unit includes chip U2, polarized capacitor C4, and capacitor C5;

[0115] Both ends of polarized capacitor C4 are respectively connected to the positive and negative output pins of chip U2;

[0116] The two ends of the capacitor C5 are respectively connected to the positive and negative poles of the output pin of the chip U2;

[0117] The two input ends of the chip U2 are respectively connected to one end of the resistor R4 far from the resistor R5, and one end of the resistor R5 far from the resistor R4.

[0118] The chip U1 uses the ADE7754 chip, the chip U2 uses the MSH10S chip, and the chips T1 and T2 use the L_33MHD7 chip.

[0119] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A remote automatic detection device for railway train noise, characterized in that, It includes a power supply circuit, as well as a wireless transmission circuit, a signal acquisition circuit, a signal processing circuit, and a storage clock circuit connected to the power supply circuit; The signal processing circuit is connected to the signal acquisition circuit and the storage clock circuit; The signal processing circuit is connected to the signal acquisition circuit through an SPI interface; Both the signal acquisition circuit and the signal processing circuit are connected to the wireless transmission circuit; The signal acquisition circuit includes a chip U1, and the input end of the chip U1 is connected to a plurality of filtering modules; The signal processing circuit includes a primary filtering unit, an isolation unit, a variable gain amplification unit, and a secondary filtering unit connected in sequence; The power supply circuit includes a filtering unit, an isolation unit, a rectifier bridge unit, and a DC-DC voltage stabilizing power supply unit connected in sequence.

2. The remote automatic railway train noise detection device according to claim 1, characterized in that, In the signal acquisition circuit, a resistor R12 is connected to pin 18 of the chip U1; A resistor R13 is provided between pin 19 and pin 20 of the chip U1; Both ends of the resistor R13 are also connected to a capacitor C18 and a capacitor C19; One ends of the capacitor C18 and the capacitor C19 are connected to one end of the resistor R13.

3. The remote automatic railway train noise detection device according to claim 2, characterized in that, The plurality of filtering modules include: The first filtering module: The capacitor C12 and the capacitor C13 are connected in parallel to form a first parallel branch. One end of the first parallel branch is connected to pin 3 of the chip U1, and the other end is grounded; The second filtering module: The capacitor C14 and the capacitor C15 are connected in parallel to form a second parallel branch. One end of the second parallel branch is connected to pin 4 of the chip U1, and the other end is grounded; The third filtering module: The capacitor C16 and the capacitor C17 are connected in parallel to form a third parallel branch. One end of the third parallel branch is connected to pin 12 of the chip U1, and the other end is grounded.

4. The remote automatic railway train noise detection device according to claim 1, characterized in that The primary filtering unit includes: a variable resistor RV1, a resistor R1, and a resistor R2; The isolation unit includes an isolation chip T1; The variable resistor RV1, the resistor R1, and the resistor R2 are connected in sequence; The end of the variable resistor RV1 far from the resistor R1 is connected to the input pin 2 of the isolation chip T1; The end of the resistor R2 far from the resistor R1 is connected to the input pin 1 of the isolation chip T1.

5. The remote automatic railway train noise detection device according to claim 4, characterized in that The variable gain amplification unit includes: A resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a variable resistor RV2, a variable resistor RV3, a variable resistor RV4, and an amplifier A1; One end of the resistor R6 is connected to the output pin 4 of the isolation chip T1, and the other end of the resistor R6 is connected to the inverting input end of the amplifier A1; One end of the resistor R7 is connected to the output pin 3 of the isolation chip T1, and the other end of the resistor R7 is connected to the non-inverting input end of the amplifier A1; The resistor R8 is connected to the non-inverting output end of the amplifier A1, and the resistor R7 is connected to the inverting output end of the amplifier A9; A capacitor C6 and a variable resistor RV3 are provided between the inverting input end and the non-inverting output end of the amplifier A1; A capacitor C6 and a variable resistor RV4 are provided between the non-inverting input end and the inverting output end of the amplifier A1; The end of the resistor R8 far from the amplifier A1 is connected to the capacitor C8, and the other end of the capacitor C8 is grounded; The end of the resistor R9 far from the amplifier A1 is connected to the capacitor C9, and the other end of the capacitor C9 is grounded.

6. The remote automatic railway train noise detection device according to claim 5, characterized in that, The secondary filtering unit includes: Resistor R10, resistor R11, capacitor C10, and capacitor C11; The resistor R10 and the capacitor C10 are connected in parallel to form a first parallel branch; The resistor R11 and the capacitor C11 are connected in parallel to form a second parallel branch; One end of the first parallel branch is connected to the resistor R8 and the capacitor C8, and the other end is connected to the second parallel branch; One end of the second parallel branch is connected to the resistor R9 and the capacitor C9.

7. The remote automatic railway train noise detection device according to claim 1, characterized in that The filtering unit includes a resistor RV1, a resistor R3, and a capacitor C1. The resistor RV1, the resistor R3, and the capacitor C1 are connected in sequence to form a closed loop; The isolation unit includes an isolation chip T2. The two ends of the capacitor C1 are also connected to the input pin 1 and the input pin 2 of the isolation chip T2.

8. The remote automatic railway train noise detection device according to claim 7, characterized in that, The rectifier bridge unit includes diodes D1 - D8, polarized capacitors C2, polarized capacitor C3, resistor R4, and resistor R5; The diodes D1 - D4 are connected in series in sequence to form a first branch; The diodes D5 - D8 are connected in series in sequence to form a second branch; The connection point of the diode D2 and the diode D3 is connected to the output pin 4 of the isolation chip T2; The connection point of the diode D6 and the diode D7 is connected to the output pin 3 of the isolation chip T2; The polarized capacitor C2 and the polarized capacitor C3 are connected to form a third branch; The resistor R4 and the resistor R5 are connected to form a fourth branch; The first branch, the second branch, the third branch, and the fourth branch are connected in parallel; The polarized capacitor C2, the polarized capacitor C3, the resistor R4, and the resistor R5 are connected to one point.

9. The remote automatic railway train noise detection device according to claim 8, wherein, The DC - DC regulated power supply unit includes a chip U2, a polarized capacitor C4, and a capacitor C5; The two ends of the polarized capacitor C4 are respectively connected to the positive and negative poles of the output pin of the chip U2; The two ends of the capacitor C5 are respectively connected to the positive and negative poles of the output pin of the chip U2; The two input ends of the chip U2 are respectively connected to the end of the resistor R4 far from the resistor R5, and the end of the resistor R5 far from the resistor R4.

10. The remote automatic railway train noise detection device according to any one of claims 1-9, characterized in that, The chip U1 uses an ADE7754 chip, the chip U2 uses an MSH10S chip, and the chips T1 and T2 use an L_33MHD7 chip.

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