Front-end signal acquisition board capable of isolating power supply interference

Abstract

The utility model belongs to the technical field of signal acquisition equipment, and particularly relates to a front-end signal acquisition board capable of isolating power supply interference, which particularly converts a main power supply on a mainboard into power supplies with different voltage levels through a power supply conversion module to supply power to a signal processing module, and effectively isolates interference signals carried by a power line through an isolation chip. The signal processing module comprises an analog switch, a signal processing unit and a test interface, and is used for transmitting and receiving signals. The acquisition board further comprises a connector, an SMA connector and other assemblies and is used for receiving main board signals, transmitting processed signals and fixing the acquisition board. The utility model has the beneficial effects of interference isolation, wire rod simplification, structural design simplification and the like, and improves the signal quality and the reliability of the whole board.

Description

TECHNICAL FIELD

[0001] The utility model belongs to signal collection equipment technical field, concretely relates to the front end signal collection board with the interference of isolated power supply. BACKGROUND

[0002] The front end signal collection board is an important part of the intelligent detection machine terminal mainboard scheme, and plays a key role in signal transmission, reception and processing. The front end signal collection board in the prior art usually needs to be connected with the mainboard through multiple wires to receive power signals of different voltage levels. In addition, the collection board also needs to use a multi-pin connector for switching to ensure stable transmission of power signals and signal processing. However, this design not only increases the cost and complexity, but also limits the flexibility and reliability of the collection board in actual application.

[0003] Specifically, the existing front end signal collection board cannot effectively isolate the interference signals carried by the power lines in the strong magnetic and strong electric field environment, which seriously affects the quality of the signals. Secondly, the power transmission lines are multiple and complex, which not only increases the cost, but also increases the complexity of the system. Finally, the structure design is complicated, and a multi-pin connector is needed for switching, which not only increases the manufacturing difficulty, but also is not conducive to the stability and reliability of the system. Therefore, the prior art urgently needs a new type of front end signal collection board that can solve these problems. SUMMARY

[0004] The purpose of the utility model is to provide a front end signal collection board with isolated power supply interference, to solve the problems of traditional front end signal collection board that cannot effectively isolate power supply interference, complex power transmission lines and complicated structure design.

[0005] The utility model realizes the above-mentioned purpose through the following technical scheme:

[0006] The utility model provides a front end signal collection board with isolated power supply interference, the collection board is arranged between the mainboard and the test end, the mainboard 2 has a main power supply, a DDS function circuit and an A / D conversion function circuit; the collection board comprises:

[0007] A power conversion module is connected with the main power supply, used for converting the main power supply into power of different voltage levels;

[0008] A signal processing module is connected with the DDS function circuit and the A / D conversion function circuit, used for processing signals;

[0009] The power conversion module supplies power for the signal processing module;

[0010] The signal processing module comprises an analog switch, a signal processing unit and a test interface;

[0011] The DDS function circuit is connected to the test interface through an analog switch to form a transmitting signal loop.

[0012] The test interface is connected to the A / D conversion function circuit through a signal processing unit to form a receiving signal loop.

[0013] Further, the power conversion module comprises two voltage conversion isolation units, which respectively provide different voltage levels of power supply for the signal processing unit and the analog switch.

[0014] Further, the acquisition board further comprises:

[0015] Connector one is used for receiving the logic control signal and the digital ground signal of the mainboard.

[0016] Connector two is used for receiving the main power signal and the main power ground signal of the mainboard.

[0017] Further, the acquisition board further comprises:

[0018] SMA connector one is connected between the analog switch and the test interface and is used for outputting the transmitting signal to the test interface.

[0019] SMA connector two is connected between the test interface and the signal processing unit and is used for receiving the signal from the test end and inputting the signal to the signal processing module for processing.

[0020] Further, the signal processing unit comprises a signal amplification assembly, a filtering assembly and a signal sampling assembly.

[0021] Further, the acquisition board comprises a PCB substrate, and at least four threaded holes are arranged on the PCB substrate to fix the acquisition board.

[0022] The utility model discloses the beneficial effect lies in:

[0023] 1. The utility model discloses the power line of various interference signals separated from the guarantee of high quality transmission of signal. This improvement directly solves the problem of the signal acquisition board of prior art in the strong magnetic field environment of strong electricity, and the signal quality is reduced. In addition, through the simplification of wire rod, a plurality of power transmission lines are no longer needed. Through the effective design of power conversion module, only the main power transmission line can meet the demand, which not only reduces the cost, but also improves the neatness and reliability of the system.

[0024] 2. The utility model discloses the optimization on structure design, and a plurality of pin connectors are no longer needed. Simple connector can meet the connection demand, which makes the structure design of system more simplified, and reduces the complexity of production and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the whole structure schematic diagram of the utility model.

[0026] In the drawing: 1, acquisition board; 2, mainboard; 3, test end; 4, power conversion module; 5, signal processing module; 6, SMA connector one; 7, SMA connector two; 8, test interface; 41, isolation unit; 51, signal processing unit; 52, analog switch. DETAILED DESCRIPTION

[0027] The following further describes the present application in detail with reference to the drawings, and it is necessary to point out here that the following detailed description is only used to further illustrate the present application, and cannot be understood as limiting the protection scope of the present application, and the skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0028] Example 1

[0029] As Figure 1 shown, the present embodiment proposes a front-end signal acquisition board with power supply interference isolation, the acquisition board 1 is arranged between the mainboard 2 and the test end 3, for realizing signal acquisition and processing, the mainboard 2 has a main power supply, a DDS function circuit and an A / D conversion function circuit, for providing necessary power supply and signal conversion function for the acquisition board; the acquisition board 1 includes: a power conversion module 4, connected with the main power supply, for converting the main power supply (such as 24V power supply) into power supplies of different voltage grades (such as ±15V and ±5V) through a power isolation chip, to meet the power supply demand of the signal processing module 5. This power conversion mode not only realizes stable output of voltage, but also effectively isolates the interference signals carried by the power line through the isolation chip, ensuring the signal quality.

[0030] The acquisition board 1 further includes a signal processing module 5, connected with the DDS function circuit and the A / D conversion function circuit, for processing the signals received from the test end 3; wherein the power conversion module 4 supplies power for the signal processing module 5; the signal processing module 5 includes an analog switch 51, a signal processing unit 52 and a test interface 53; the DDS function circuit is connected to the test interface 53 through the analog switch 51, forming a transmitting signal loop; the test interface 53 is connected to the A / D conversion function circuit through the signal processing unit 52, forming a receiving signal loop. More specifically, the analog switch 51 is used to switch the transmitting and receiving paths of the signals; the signal processing unit 52 then amplifies, filters and samples the received signals for extracting useful signal information; the test interface 53 then serves as the interface for signal transmission and reception, and is connected with the test end 3.

[0031] Preferably, the power conversion module 4 comprises two voltage conversion isolation units 41, which respectively provide different voltage levels of power supply for the signal processing unit 52 and the analog switch 51.

[0032] Preferably, the acquisition board 1 further comprises a connector one and a connector two. The connector one is used to receive the logic control signal and the digital ground signal on the main board 2, so as to realize the signal transmission and control between the acquisition board 1 and the main board 2; the connector two is used to receive the main power signal and the main power ground signal on the main board 2, so as to provide stable power input for the acquisition board.

[0033] Preferably, the acquisition board 1 is further provided with an SMA connector one 6 and an SMA connector two 7. The SMA connector one 6 connects the analog switch 51 and the test interface 53, and is used to output the transmitting signal to the test interface 53; the SMA connector two 7 connects the test interface 53 and the signal processing unit 52, and is used to receive the signal from the test end 3 and input it to the signal processing module 5 for processing. The setting of the SMA connector not only facilitates the transmission and reception of the signal, but also improves the stability and reliability of the signal.

[0034] Preferably, the signal processing unit 52 comprises a signal amplification component, a filter component and a signal sampling component.

[0035] In some optional embodiments, the acquisition board 1 comprises a PCB substrate, and the PCB substrate is provided with at least four threaded holes for fixing the acquisition board.

[0036] For example, the working principle and process of the front-end signal acquisition board with isolation of power supply interference in the embodiment are as follows:

[0037] The acquisition board is arranged between the main board and the test end, and mainly undertakes the tasks of signal acquisition, processing and transmission. First, the main power on the main board is input to the power conversion module on the acquisition board through the connector two. The module converts the 24V main power into power supply with different voltage levels such as ±15V and ±5V through the internal voltage conversion isolation unit, so as to provide stable power supply for the signal processing module.

[0038] Then, in the signal processing module, the DDS functional circuit is connected to the test interface through the analog switch, forming a transmitting signal loop. When the transmitting signal is needed, the source signal is received through the input port, and is switched to the test interface through the analog switch, so as to complete the transmitting of the signal.

[0039] On the other hand, the test interface is also responsible for receiving the signal from the test end. After the received signal is processed by the signal amplification component, the filter component and the signal sampling component in the signal processing unit, it is transmitted back to the A / D conversion functional circuit through the connector, forming a receiving signal loop.

[0040] In addition, four screw columns are reserved on the collection plate for fixing the collection plate, so as to ensure stable operation.

[0041] According to the above-mentioned embodiments, the utility model effectively isolates the interference signal carried by the power line through the design of the isolation unit of the power conversion module and the signal processing module, guarantees the signal quality; at the same time, through the simplification of wire and structure design, cost and complexity are reduced.

[0042] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A front-end signal acquisition board with isolation of power supply interference, characterized in that, The collection board (1) is arranged between a main board (2) and a test end (3), the main board (2) has a main power supply, a DDS function circuit and an A / D conversion function circuit; The collection board (1) comprises: A power conversion module (4) connected with the main power supply, for converting the main power supply into power supplies of different voltage levels; A signal processing module (5) connected with the DDS function circuit and the A / D conversion function circuit, for processing signals; The power conversion module (4) supplies power for the signal processing module (5); The signal processing module (5) comprises an analog switch (51), a signal processing unit (52) and a test interface (53); The DDS function circuit is connected to the test interface (53) through the analog switch (51), forming a transmitting signal loop; The test interface (53) is connected to the A / D conversion function circuit through the signal processing unit (52), forming a receiving signal loop.

2. The front-end signal acquisition board for isolating power supply interference according to claim 1, wherein, The power conversion module (4) comprises two voltage conversion isolation units (41), the two isolation units (41) respectively provide power supplies of different voltage levels for the signal processing unit (52) and the analog switch (51).

3. The front-end signal acquisition board for isolating power supply interference according to claim 1, wherein, The collection board (1) further comprises: Connector one, for receiving logical control signals and digital ground signals of the main board (2); Connector two, for receiving main power supply signals and main power supply ground signals of the main board (2).

4. The front-end signal acquisition board of claim 1, wherein, The collection board further comprises: SMA connector one (6), connecting the analog switch (51) and the test interface (53), for outputting transmitting signals to the test interface (53); SMA connector two (7), connecting the test interface (53) and the signal processing unit (52), for receiving signals from the test end (3) and inputting the signals to the signal processing module (5) for processing.

5. The front-end signal acquisition board for isolating power supply interference according to claim 1, characterized in that: The signal processing unit (52) comprises a signal amplification assembly, a filter assembly and a signal sampling assembly.

6. The front-end signal acquisition board of claim 1, wherein, The collection board (1) comprises a PCB substrate, and at least four threaded holes are arranged on the PCB substrate, for fixing the collection board.

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