High-frequency data acquisition card

Abstract

The utility model discloses a high-frequency data acquisition card, which relates to the technical field of high-frequency data acquisition cards and comprises a PCBA (printed circuit board assembly), a connector and a signal acquisition component, the connector and the signal acquisition component are arranged at one end of the PCBA, and the signal acquisition component comprises an ADC (analog-to-digital converter) acquisition device arranged on the PCBA; the high-frequency noise filtering assembly comprises a common-mode filtering assembly arranged on one side of the ADC acquisition device; and the conversion reading assembly comprises a U analog-to-digital conversion chip for signal conversion and an MCU device for reading the converted signal. According to the device, through cooperative work of all the components, high-frequency signals are collected, the influence of adverse factors such as noise in the high-frequency data collection process is remarkably reduced, and therefore the collection accuracy and high practicability are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of high-frequency data acquisition cards, and particularly to a high-frequency data acquisition card. Background Art

[0002] A high-frequency data acquisition card is a device specifically designed for high-speed acquisition of various external analog signals and converting them into digital signals for computer processing. It uses an analog-to-digital converter (ADC) to convert analog signals into digital signals and transmits them to the computer through a high-speed interface (such as PCIe, USB, etc.). The core of the high-frequency data acquisition card lies in its high-speed processing ability to meet the acquisition requirements of high-frequency signals.

[0003] When the high-frequency data acquisition card acquires high-frequency signals, external high-frequency noise interference and noise generated by the device itself, such as power supply, will reduce the accuracy and frequency of signal acquisition. As a result, some existing data acquisition cards have low acquisition accuracy due to noise interference when acquiring high-frequency signals.

[0004] Therefore, we propose a high-frequency data acquisition card to solve the above-mentioned technical problems. Content of the Utility Model

[0005] In view of this, the main purpose of the utility model is to provide a high-frequency data acquisition card, which aims to solve the above problems.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions: It includes a PCBA board, a connector arranged at one end of the PCBA board, a signal acquisition component, where the signal acquisition component includes an ADC acquisition device arranged on the PCBA board; a high-frequency noise filtering component, where the high-frequency noise filtering component includes a common-mode filtering component arranged on one side of the ADC acquisition device; a conversion and reading component, where the conversion and reading component includes a U2 analog-to-digital conversion chip for signal conversion and an MCU device for reading the converted signal, and a common-mode filtering input component for filtering input is arranged at one end of the PCBA board.

[0007] As a preferred solution, an isolator for isolating internal and external signals is also arranged on the PCBA board, and several groups of isolators are fixed on the PCBA board.

[0008] As a preferred solution, a single-ended to differential device for enhancing the anti-interference ability of communication is also arranged on the PCBA board, and the single-ended to differential device is arranged on one side of the isolator.

[0009] As a preferred solution, a sampling module chip power supply ultra-low noise LDO and an MCU power supply ultra-low noise LDO for voltage stabilization and noise filtering are arranged on the PCBA board.

[0010] As a preferred solution, a power isolation device for voltage transformation isolation is provided between the connector and the single-ended to differential device.

[0011] Compared with the prior art, the present utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solutions, the main ones are:

[0012] In summary, first, the connection is achieved through the connector, and then the signal is sampled by the ADC acquisition device. The common-mode filtering input component filters the input during the operation of the common-mode filtering component. Subsequently, the common-mode filtering component performs digital filtering, noise reduction, quantization, etc. on the signal collected by the ADC acquisition device to improve the quality and accuracy of the signal. Next, the U2 analog-to-digital conversion chip converts the signal after removing high-frequency noise into digital quantity, and the MCU device is responsible for reading these processed signals. The single-ended to differential device is used to enhance the anti-interference ability during communication and reduce the influence of external environmental interference on the internal signal transmission. The ultra-low noise LDO for the sampling chip power supply and the ultra-low noise LDO for the MCU power supply can stabilize the voltage and eliminate the noise generated by the power supply. The power isolation device is used to achieve voltage transformation isolation and effectively isolate the noise interference generated during the operation of the power supply. Through the collaborative work of each component, this device realizes the acquisition of high-frequency signals and significantly reduces the influence of adverse factors such as noise during the high-frequency data acquisition process, thereby ensuring the accuracy of the acquisition and high practicality.

[0013] To more clearly elaborate the structural features and functions of the present utility model, the following will combine the drawings with specific embodiments to describe the present utility model in detail. Description of the Drawings

[0014] Figure 1 is a top view structural schematic diagram of an embodiment of the present utility model;

[0015] Figure 2 is a front view structural schematic diagram of an embodiment of the present utility model;

[0016] Figure 3 is a principle schematic diagram of an embodiment of the present utility model;

[0017] Figure 4 is a schematic diagram of the PCBA board wiring of an embodiment of the present utility model.

[0018] Description of the reference numerals: 1. PCBA board; 2. Connector; 3. Power isolation device; 4. Single-ended to differential device; 5. Isolator; 6. ADC acquisition device; 7. Common-mode filtering component; 8. MCU device; 9. Common-mode filtering input component; 10. Ultra-low noise LDO for sampling chip power supply; 11. Ultra-low noise LDO for MCU power supply; 12. U2 analog-to-digital conversion chip. Detailed implementation manners

[0019] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific implementation examples described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0021] Please refer to Figures 1 to 4 , an embodiment of the present utility model provides a high-frequency data acquisition card, which includes a PCBA board 1 and a connector 2 provided at one end of the PCBA board 1, a signal acquisition component, the signal acquisition component includes an ADC acquisition device 6 provided on the PCBA board 1, and the ADC acquisition device 6 is fixed on the PCBA board 1 by welding, and is used to determine a sampling signal to ensure that the sampling frequency is more than ten times higher than the signal bandwidth;

[0022] A high-frequency noise filtering component, the high-frequency noise filtering component includes a common-mode filtering component 7 provided on one side of the ADC acquisition device 6, and the common-mode filtering component 7 is fixed on the PCBA board 1 by welding, and is used to perform digital filtering, noise removal, quantization and other processing on the digital signal collected by the ADC acquisition device 6, and is used to improve the accuracy of the signal quality. Its implementation principle is that the common-mode filtering component 7 includes a common-mode filtering circuit, and the noise generated by the sensor included in the signal with high-frequency noise is filtered through the common-mode filtering circuit. The sensors mentioned here are pressure sensors and other sensors that generate high-frequency noise when the high-frequency data acquisition card is used in industrial automation production, laboratory tests, communication systems and other fields;

[0023] A conversion and reading component, the conversion and reading component includes a U2 analog-to-digital conversion chip 12 for signal conversion and an MCU device 8 for reading the converted signal. The U2 analog-to-digital conversion chip 12 performs digital conversion on the signal after removing high-frequency noise, and then reads it through the MCU device 8.

[0024] Please refer to Figures 1 to 4, an isolator 5 for isolating internal and external signals is also provided on the PCBA board 1. Several groups of isolators 5 are fixed on the PCBA board 1. Specifically, two groups of isolators 5 can be provided. Through the isolator 5, the converted digital quantity signal can be separated from the external signal to reduce the interference of the external signal on the converted digital quantity signal.

[0025] Please refer to Figures 1 to 4 , a single-ended to differential device 4 for enhancing the anti-interference ability of communication is also provided on the PCBA board 1. The single-ended to differential device 4 is arranged on one side of the isolator 5. The single-ended to differential device 4 is fixed on the PCBA board 1 by welding, which is used to increase the anti-interference ability during communication and reduce the situation of internal signal transmission disorder caused by external environmental interference.

[0026] Please refer to Figures 1 to 4 , a sampling chip power supply ultra-low noise LDO 10 and an MCU power supply ultra-low noise LDO 11 for regulating voltage and filtering noise are provided on the PCBA board 1. The sampling chip power supply ultra-low noise LDO 10 and the MCU power supply ultra-low noise LDO 11 are both connected to the PCBA board 1 by welding. Through the sampling chip power supply ultra-low noise LDO 10 and the MCU power supply ultra-low noise LDO 11, voltage can be regulated and the noise generated by the power supply can be eliminated at the same time.

[0027] Please refer to Figures 1 to 4 , a power isolation device 3 for voltage transformation isolation is arranged between the connector 2 and the single-ended to differential device 4. The power isolation device 3 is fixed on the PCBA board 1 by welding, which is used to achieve voltage transformation isolation so as to isolate the noise interference generated when the power supply works.

[0028] Please refer to Figures 1 to 4 , a common-mode filtering input component 9 for filtering input is arranged at one end of the PCBA board 1. The common-mode filtering input component 9 is used for filtering signal input when the common-mode filtering component 7 works.

[0029] In summary, first, the connection is achieved through the connector 2. Then, the signal is sampled by the ADC acquisition device 6. The common-mode filtering input component 9 filters and inputs the working signal of the common-mode filtering component 7. Then, the common-mode filtering component 7 performs digital filtering, denoising, quantization and other processing on the digital signal collected by the ADC acquisition device 6 to improve the quality and accuracy of the signal. Next, the U2 analog-to-digital conversion chip 12 converts the signal after removing high-frequency noise into a digital quantity. Then, it is read by the MCU device 8. The single-ended to differential device 4 is used to increase the anti-interference ability during communication and reduce the situation of internal signal transmission disorder caused by external environmental interference. The ultra-low-noise LDO 10 for the sampling chip power supply and the ultra-low-noise LDO 11 for the MCU power supply can stabilize the voltage and eliminate the noise generated by the power supply at the same time. The power isolation device 3 is used to achieve voltage transformation isolation to isolate the noise interference generated during the operation of the power supply. Through the collaborative action of each device, this device realizes high-frequency signal acquisition, reduces the influence of noise and other factors during high-frequency data acquisition, and has high acquisition accuracy and strong practicability.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-frequency data acquisition card, comprising a PCBA board (1) and a connector (2) provided at one end of the PCBA board (1), characterized in that: A signal acquisition component, the signal acquisition component comprising an ADC acquisition device (6) arranged on a PCBA board (1); a high-frequency noise filtering component, the high-frequency noise filtering component comprising a common-mode filtering component (7) arranged on one side of the ADC acquisition device (6); a conversion and reading component, the conversion and reading component comprising a U2 analog-to-digital conversion chip (12) for signal conversion and an MCU device (8) for reading the converted signal, and a common-mode filtering input component (9) for filtering input is arranged at one end of the PCBA board (1).

2. A high frequency data acquisition card according to claim 1, characterized in that: The PCBA board (1) is also provided with an isolator (5) for isolating internal and external signals, and a plurality of groups of the isolators (5) are fixed on the PCBA board (1).

3. A high frequency data acquisition card according to claim 2, characterized in that: The PCBA board (1) is also provided with a single-ended to differential device (4) for enhancing communication anti-interference capability, and the single-ended to differential device (4) is provided on one side of the isolator (5).

4. A high frequency data acquisition card according to claim 1, characterized in that: The PCBA board (1) is provided with a chip power supply ultra-low noise LDO (10) and an MCU power supply ultra-low noise LDO (11) for voltage stabilization noise filtering.

5. A high frequency data acquisition card according to claim 1, characterized in that: A power supply isolation device (3) for voltage conversion isolation is provided between the connector (2) and the single-ended to differential device (4).

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