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Two-way 4-20mA DC analogue quantity output device

A technology of DC analog quantity and output device, applied in the direction of digital-to-analog converter, electrical components, parallel/serial conversion, etc., which can solve the problems of inconvenient maintenance, increase of transmitter investment, occupation of factory land, etc., and achieve price reduction , low cost, and low manufacturing level requirements

Inactive Publication Date: 2008-03-05
JIANGSU WISCOM TECHNOLOGY CO LTD
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AI Technical Summary

Problems solved by technology

It not only occupies the land of the factory station, but also increases the investment of the transmitter, and at the same time brings inconvenience to maintenance

Method used

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  • Two-way 4-20mA DC analogue quantity output device
  • Two-way 4-20mA DC analogue quantity output device
  • Two-way 4-20mA DC analogue quantity output device

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Embodiment Construction

[0016] Fig. 1 and Fig. 2 are circuit principle block diagram and circuit principle diagram of the present invention respectively. It consists of a high-speed optical isolator 1, a digital / analog converter 2, an operational amplifier 3, and a voltage reference source 4; among them, the high-speed optical isolator 1, the digital / analog converter 2, and the operational amplifier 3 are sequentially connected in series, and the voltage reference source 4 Connect with the digital / analog converter 2 and the operational amplifier 3 respectively, the input terminal of the high-speed optical isolator 1 is the input terminal of the device, and the output terminal of the operational amplifier 3 is the output terminal of the device. "SYN1, SYN2, SCK, DAIN" are the SPI communication lines of two digital / analog conversion devices (AD5660), which are connected to the IO legs of the upper-level FPGA (field programmable gate array) after optical isolation. The FPGA selects one of the two AD5660...

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Abstract

This invention relates to a two-way 4-20mA DC analog volume output device based on FPGA control different from the circuit controlling single DAC chips with the SPI interface of a master CPU, which can simulate two-way SPI communication line by the IO interface of FPGA and converts parallel digital information given by the master CPU to a serial digital flow required by the DAC and outputs it to realize DC analog volume output of 4-20mA, and the device is composed of a high speed optical isolator, a D / A converter, an operational amplifier and a voltage primary source, in which, the high speed optical isolator, the D / A converter and the operational amplifier are serial in sequence, the voltage primary source is connected with the converter and the amplifier, the input of the isolator is the input of the device and the output of the amplifier is the output of the device.

Description

technical field [0001] The invention is a dual-channel 4-20mA direct-current analog quantity output device based on FPGA control, which is different from a circuit that controls a single-chip DAC chip through an SPI port through a main CPU. This circuit can simulate a dual-channel SPI communication line through the IO port of the FPGA, convert the parallel digital information given by the main CPU into the serial digital stream output required by the DAC, and realize the 4-20mA DC analog output. It belongs to the technical field of electric automation device manufacturing. Background technique [0002] In the power system, especially in the electrical monitoring system of the power plant, the main control room needs to monitor one or more channels of analog quantities at remote sites, and the transmitters with large volume, heavy weight and high cost are often used to convert the analog quantities into 4 -20mA DC flow is sent to the main control room. It not only occupies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M9/00H03M1/66
Inventor 伍道勇丁宁杨晓松过伟仲伟邵辰宇
Owner JIANGSU WISCOM TECHNOLOGY CO LTD
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