Isolated type high-speed data acquisition card

A high-speed data acquisition and isolation technology, applied in electrical digital data processing, instruments, etc., can solve the problems of common ground connection, high price, poor versatility and anti-interference, and achieve good work stability, wide application range, Feature-rich effects

Inactive Publication Date: 2013-07-31
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the shortcomings of existing data acquisition cards such as high price, poor versatility and anti-interference, the present invention proposes a design method for an isol

Method used

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  • Isolated type high-speed data acquisition card
  • Isolated type high-speed data acquisition card
  • Isolated type high-speed data acquisition card

Examples

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Example Embodiment

[0020] The invention provides an isolated high-speed data acquisition card based on FPGA and network communication, such as figure 1 As shown, the system power supply 101 provides +12V input voltage, one part supplies power to the DC / DC power supply module 102, and the other part supplies power to the output stage of the magnetic lotus signal isolation circuit 106, FPGA 107, and network interface circuit 108. Each circuit has its own needs Voltage regulator chip. The DC / DC power supply module 102 outputs a +12V voltage to provide power to the differential drive circuit 104 and the gain control circuit 103, and supplies power to the input stage of the ADC analog-to-digital conversion circuit 105 and the magnetic lotus signal isolation circuit 106 through the voltage regulator chip;

[0021] The gain control circuit 103 amplifies or attenuates the collected analog voltage signal, converts the single-ended signal into a differential signal through the differential drive circuit 104, ...

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Abstract

The invention discloses an isolated type high-speed data acquisition card, and belongs to the technical field of embedded type measurement. An analog signal to be measured is connected to a gain control circuit (103) through an input interface; an output end of the gain control circuit (103) is connected to a difference drive circuit (104); an output end of the difference drive circuit (104) is connected to an ADC (analog to digital converter) analog-to-digital conversion circuit (105); an output end of the ADC analog-to-digital conversion circuit (105) is connected to a signal isolation circuit (106); an output end of the signal isolation circuit (106) is connected to an FPGA (field programmable gate array) (107); a data processing circuit and an embedded type soft kernel processor are arranged in the FPGA (107); the processor caches the data to an SDRAM (synchronous dynamic random access memory), and the data passes through a network interface circuit (108) and is transmitted to a host computer terminal (109) from the SDRAM; and the kernel processor is a nios processor. According to the isolated type high-speed data acquisition card, the signal acquisition can adopt program control, a signal to be measured is in electric isolation with an external circuit, an internal circuit of a control chip can be programmatically updated, and the stability of data transmission and the flexibility of application are improved.

Description

Technical field: [0001] Based on FPGA and LAN communication technology and digital signal isolation technology, the present invention realizes high-speed acquisition of analog signals, isolation of digital signals, elimination of noise and interference signals, and fast and stable transmission of the collected data to the PC. In the field of measurement technology, an isolated high-speed data acquisition device is realized. It is suitable for high-speed data acquisition occasions where the electrical connection between the data acquisition object and the acquisition equipment needs to be isolated. Background technique: [0002] The data acquisition card is a device that collects power or non-power signals from analog and digital units under test such as sensors and other devices under test, and sends them to the host computer for analysis and processing. The high-performance signal acquisition system has the characteristics of high cost and poor flexibility, which limits it...

Claims

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Application Information

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IPC IPC(8): G06F13/38
Inventor 张本云谢雪松张小玲吕长志佘硕杰田蕴杰
Owner BEIJING UNIV OF TECH
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