Isolated type high-speed data acquisition card

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...

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 isolated high-speed data acquisition card to solve the common problem between the measured object and the test equipment in the conventional data acquisition system. ground connection problem

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