Single-channel time-sharing multiplexing sampling method and sampling circuit thereof

Abstract

The invention discloses a single-channel time-sharing multiplexing sampling method, which comprises the following steps that: 1, single-path primary signals are converted into single-channel signals through an analog switch controlled by a single chip; 2, a single-channel signal output end is connected with an amplification signal of an amplifying circuit; 3, the output end of the amplifying circuit is connected with a filtered high-frequency signal of a filter circuit; and 4, the output end of the filter circuit is connected with the single chip with A / D to sample and calculate the sampling signals. The method is implemented by means of a single-channel time-sharing multiplexing sampling circuit; and the sampling circuit consists of the analog switch, a programmable amplifying circuit, an anti-aliasing filter circuit and the single chip with the A / D which are connected in turn, wherein the single chip with the A / D controls the analog switch and the programmable amplifying circuit. The method overcomes multi-channelizing of the conventional sampling method and skillfully adopts a single channel to replace multiple channels, and the single-channel time-sharing multiplexing sampling circuit is designed according to the method; therefore, the instantaneity, accuracy and reliability of the sampling signals are improved.

Description

technical field [0001] The invention relates to a single-channel time-division multiplexing sampling method and a sampling circuit thereof, in particular to an AC sampling method and a sampling circuit applied to a three-phase AC system. Background technique [0002] At present, the distributed systems commonly used in the field of industrial control are generally divided into three levels: process level, monitoring level and management information level. The distributed system is a system that integrates the microcomputer-based process monitoring unit, process control unit, graphic and text operation station and host computer (upper computer) scattered in the field. It adopts LAN technology to interconnect multiple process monitoring, operation stations and host computers, which enhances communication functions, speeds up information transmission, and increases throughput, which provides a basis for comprehensive management of information. In the monitoring level, the sign...

AI Technical Summary

Problems solved by technology

[0004] The existing AC sampling technology (multi-channel) has the following disadvantages: first, there are 7 original signals, and 7 channels are needed, and each channel needs a corresponding amplifier circuit and anti-aliasing filter circuit, which will cause The input circuit is complex; second, the discreteness between channels that is difficult to eliminate and the inaccurate measurement results caused by asynchronous sampling when measuring multiple related signals will have a certain impact on AC sampling, resulting in large deviations in measurement results; Third, there are many input signals, and the working status of components often changes greatly, and a series of drifts will occur, which will inevitably produce errors that are difficult to correct, making the instrument unable to continue to use normally; fourth, multi-stage signal amplification can be achieved. If To achieve such a function with multiple channels, it is necessary to add a multi-stage amplifier circuit to each channel, which makes the hardware circuit more complicated.

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