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

A technology of DC analog quantity and output device, which is applied in digital-to-analog converters, electrical components, parallel/serial conversion, etc. It can solve the problems of occupying plant land, inconvenient maintenance, increasing transmitter investment, etc., and achieves price reduction , simple interface and low cost

Inactive Publication Date: 2009-12-09
JIANGSU WISCOM TECHNOLOGY CO LTD
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  • Description
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  • Application Information

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

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Embodiment Construction

[0016] figure 1 and figure 2 Respectively, the circuit principle block diagram and the circuit principle diagram of the present invention. 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 th...

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Abstract

The dual-channel 4-20mA DC analog output device is a dual-channel 4-20mA DC analog output device based on FPGA control, which is different from the circuit that controls the single-chip DAC chip through the main CPU through the SPI port. 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. The device is composed 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), the operational amplifier (3) is sequentially connected in series, the voltage reference source (4) is connected with the digital / analog converter (2) and the operational amplifier (3) respectively, and the input end of the high-speed optical isolator (1) is the The input terminal and the output terminal of the operational amplifier (3) are the output terminals 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 Patents(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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