Optical fiber current transformer phase difference detecting and processing device

Abstract

The invention belongs to the technical field of signal processing, in particular to an optical fiber current transformer phase difference detecting and processing device, and aims to provide a device which contributes to improving the accuracy and the completeness of an output sample of a photodiode and reducing noise interference and simultaneously can be compatible with various photodiode devices. The optical fiber current transformer phase difference detecting and processing device is characterized by comprising a two-way A / D converter and a digital signal compensator. The optical fiber current transformer phase difference detecting and processing device has the advantages that: by adopting the two-way A / D converter and the digital signal compensator, the photodiode in an optical fiber current transformer system outputs, samples and processes simultaneously, so that the problems of low accuracy, high noise and inadaptation to large dynamic range of the photodiode caused by a one-path A / D converter can be solved well; therefore, higher accuracy, lower noise and the adaptation to wider dynamic output can be brought.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a phase difference detection and processing method of an optical fiber current transformer. Background technique [0002] In the fiber optic current transformer system based on closed-loop control, accurate sampling and processing of the electrical signal output by the photodiode is the key to improving the accuracy and related indicators of the entire system. The amplitude of the electrical signal output by the photodiode is relatively small. In actual system design, the method of sampling with an operational amplifier and an A / D converter is often used. The bandwidth of the operational amplifier is relatively large, which can meet the requirements of photoelectricity to a certain extent. The bandwidth requirements of the diode output; the accuracy and method of A / D sampling are related to the accuracy of the restoration of the output signal of the photodio...

AI Technical Summary

Problems solved by technology

Each modulation cycle is sampled once, and then sent to DSP or FPGA for differential and related processing, which has high requirements for the sampling speed and accuracy of the A / D converter, and the general single-channel A / D will also introduce noise , and the processing efficiency is low

The difference between the sampling values ​​of a single A / D in two cycles may be relatively large, and it may be difficult to meet the dynamic processing capabilities of CPLD and DSP, which cannot meet the requirements of multi-type photodiode output in engineering practice

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