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Current signal real-time online detection method considering resistance value drift of resistor

A technology of resistance value drift and current signal, applied in electrical components, digital measurement technology for measurement, digital transmission system, etc., can solve the problems of large resistance temperature range, unrealizable circuit, high cost, etc., and achieve high precision sampling, The effect of improving detection accuracy

Active Publication Date: 2020-09-18
TONGJI UNIV +1
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Problems solved by technology

[0003] If the current range passing through the circuit is relatively large, the inevitable temperature range of the resistance is relatively large, resulting in significant drift of the resistance value and affecting the sampling accuracy
The higher the sampling accuracy requirements, the higher the accuracy and drift requirements of the resistors, resulting in high cost, and sometimes there are no resistors in reality that can meet the requirements of accuracy and resistance drift at the same time, making the circuit impossible to realize

Method used

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  • Current signal real-time online detection method considering resistance value drift of resistor
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  • Current signal real-time online detection method considering resistance value drift of resistor

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0027] This embodiment provides a real-time online detection method for current signals considering the drift of resistance value, which is used to detect the output current signal of the signal transmission system. In this method, a calibration signal is added to the signal to be detected in the signal transmission system, By sampling and detecting the calibration signal, the online calibration of the sampling resistor is realized, the influence of the drift of the resistance value of the resistor is eliminated, and the accurate signal to be detected is obtained.

[0028] In this met...

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Abstract

The invention relates to a current signal real-time online detection method considering resistance value drift of a resistor. The method is used for detecting an output current signal of a signal transmission system, a calibration signal is added to a to-be-detected signal of the signal transmission system, online calibration of a sampling resistor is realized through sampling detection of the calibration signal, the influence of resistance value drift of the resistor is eliminated, and the accurate to-be-detected signal is obtained. Compared with the prior art, the method enables a detectioncircuit to perform signal alignment and signal calibration, and has the advantage of improving the circuit detection precision and the like.

Description

technical field [0001] The invention relates to a signal detection method of a signal transmission system, in particular to a real-time on-line detection method of a current signal in consideration of resistance value drift. Background technique [0002] There are two ways of analog electrical signal transmission: voltage transmission signal and current transmission signal. The most widely used in practice is to use current to transmit analog quantities. The reason for using the current signal is that it is not easily disturbed, has good stability, and the internal resistance of the current source is infinite, and the resistance of the wire connected in series in the loop does not affect the accuracy. When using current to transmit analog signals, it is necessary to add a sampling resistor at the receiving end for signal detection, such as a current-type analog signal generating sampling and amplifying circuit disclosed in patent CN203588070U. Usually, the sampling resisto...

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Application Information

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IPC IPC(8): G01R19/25H04L12/26
CPCG01R19/25H04L43/08
Inventor 秦峰张奎鲁涤强林滢王霄桦金宇
Owner TONGJI UNIV
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