A Linear Photoelectric Isolation Circuit for Suppressing Temperature Drift

Abstract

The invention provides a linear photoelectric isolation circuit for suppressing temperature drift. The linear photoelectric isolation circuit comprises the components of a signal input source which isused for supplying an input signal; a signal conditioning unit which is connected with the signal input source and is used for converting the input signal to two signals with same amplitude, same waveform and opposite polarities; two optical coupler units which are connected with the signal conditioning unit and are used for transmitting the two signals; a differential operating unit which is connected with the optical coupler units and is used for performing operational processing on the signals that are output from the optical coupler units; and an output circuit which is connected with thedifferential operational unit and is used for outputting the signals after operational processing by the differential operating unit. The linear photoelectric isolation circuit has advantages of settling a signal gain error problem caused by the temperature drift and a waveform interference noise problem in signal isolated transmission, thereby accurate isolated transmission of the signal, and better satisfying an actual application requirement of the linear photoelectric isolation circuit in a high-voltage industrial field.

Description

technical field [0001] The invention relates to the field of high-voltage electrical equipment testing, in particular to a linear photoelectric isolation circuit for suppressing temperature drift. Background technique [0002] In the field of high-voltage insulation diagnosis and high-voltage industrial applications, linear photoelectric isolation circuits are often used, and linear photoelectric isolation circuits are required to have high precision. At present, in industrial applications, the combination of V-F conversion and analog optical fiber is often used to realize linear signal isolation. However, using a voltage-frequency conversion chip, the conversion accuracy is not high due to the limitation of its resolution, and the voltage range of the input signal is small. When using a linear optocoupler for isolation, since the linearity and conversion gain of the optocoupler are greatly affected by temperature, there is a large signal transmission error, so it is necess...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a linear photoelectric isolation circuit that suppresses temperature drift, which can improve the problem of signal gain error caused by temperature drift and the problem of waveform interference and noise in signal isolation transmission, so as to realize accurate signal isolation transmission

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