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Analog quantity twin signal converter for long-distance anti-electromagnetic interference transmission of analog quantity signals

An analog signal and anti-electromagnetic interference technology, which is applied in the direction of instruments, measuring devices, liquid level indicators, etc., can solve problems such as jumping, easy distortion of analog signals, and the influence of electromagnetic interference on long-distance transmission of analog signals, achieving Avoid distortion and jump, ensure long-distance accurate transmission, and eliminate the effect of external electromagnetic interference

Pending Publication Date: 2021-08-10
CHINA YANGTZE POWER
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the application occasions such as field equipment control and state monitoring. The analog signal of distance transmission is easy to be distorted, resulting in the problem of jump phenomenon

Method used

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  • Analog quantity twin signal converter for long-distance anti-electromagnetic interference transmission of analog quantity signals
  • Analog quantity twin signal converter for long-distance anti-electromagnetic interference transmission of analog quantity signals
  • Analog quantity twin signal converter for long-distance anti-electromagnetic interference transmission of analog quantity signals

Examples

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Effect test

Embodiment 1

[0138] The liquid level sensor 11 of the pressure oil tank of the hydraulic system of the governor measures the liquid level C of the oil tank 12 of the hydraulic system, and the output 4-20mA analog signal is passed through a device for long-distance anti-electromagnetic interference transmission of the analog signal according to the present invention. After conversion by the analog twin signal converter D, a pair of complementary twin signals of 4-20mA specification about the liquid level of the pressure oil tank of the hydraulic system of the governor are output. An analog twin signal receiver A used for long-distance anti-electromagnetic interference transmission of analog signals, the receiver is processed and output to the liquid level electronic display table 14, such as Figure 8 shown.

[0139] The pressure oil tank liquid level sensor 11 of the governor hydraulic system measures the liquid level C of the oil tank 12 of the hydraulic system, outputs the liquid level s...

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Abstract

An analog quantity twin signal converter for long-distance anti-electromagnetic interference transmission of analog quantity signals comprises an input channel module, a first signal pre-processing module, a first dial-up module, a first control module, a first AD conversion module, a first twin channel signal processing module, a first DA conversion module, a first signal output processing module, and a first twin channel output module. According to the analog quantity twin signal converter, external electromagnetic interference is eliminated by adopting a differential method, long-distance accurate transmission of analog quantity signals is achieved, and the analog quantity twin signal converter is not affected by electromagnetic interference of the surrounding environment. The converter is suitable for converting continuously changing analog voltage and current signals with specifications such as conventional 4-20 mA or 0-20 mA current signals or 0-5 V voltage signals and the like.

Description

technical field [0001] The invention relates to a signal converter, in particular to an analog twin signal converter for long-distance anti-electromagnetic interference transmission of analog signals. Background technique [0002] Long-distance transmission of analog signals generally adopts two methods: communication and hard wiring. In the communication mode, if there is network congestion in the communication line, packet loss is prone to occur, which seriously affects the transmission quality of the analog signal, and cannot meet the requirements of real-time, accuracy and reliability. The general communication analog signal is not used for field device control; In the ordinary hard-wiring mode, the long-distance transmission of analog signals is easily affected by the electromagnetic interference of the surrounding environment, especially when there are strong electromagnetic field interference sources such as motors around, the analog signals for long-distance transmis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/00
CPCG01F23/802Y02P90/02
Inventor 涂勇
Owner CHINA YANGTZE POWER
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