A voltage sensing device and detection method for combined use of elasto-optic modulation and electro-optic modulation

Abstract

The invention relates to the field of voltage measurement, in particular to a voltage sensing device and detection method for combined use of elastic-optic modulation and electro-optic modulation. Based on the elastic-optic modulation technology, the phase difference introduced by the voltage to be measured to the electro-optic crystal is realized quickly and efficiently. High-sensitivity detection realizes real-time and fast voltage sensing; the electro-optic sensing element uses a single-axis electro-optic crystal, which passes light in the direction of the optical axis, which improves the temperature stability of the voltage sensing device; signal processing is realized based on digital lock-in amplification technology . Both signal acquisition and digital phase-locking are controlled by the same FPGA, and the input signal of the LC resonant high-voltage drive circuit of the elastic optical modulator is also provided by the FPGA, which ensures that the reference signal and the modulated fundamental frequency signal have the same frequency and same source, improving the Accuracy of signal processing; in the present invention, the computer completes the phase-locked data processing, and finally solves to obtain the voltage to be measured, and then stores and displays it. The present invention has high measurement sensitivity and precision, no moving parts, and low cost, which is beneficial to industrial automation integration .

Description

technical field [0001] The invention relates to the field of voltage measurement, and more specifically relates to a voltage sensing device and a detection method for combined use of elastic-optic modulation and electro-optic modulation. Background technique [0002] Voltage measurement is not only an important part of electronic circuit measurement, but also the basis of many electrical parameter measurements. In particular, voltage measurement is of great significance in power systems. Voltage sensing devices based on voltage sensors perceive the measured voltage and convert it into an available output signal, which plays a huge application value in various automatic detection and control systems. . With the development of more and more new technologies, voltage sensors have also been greatly developed and widely used. The voltage sensor can automatically detect the voltage, so that we can display the voltage of the power equipment or system, and further control it, and ...

AI Technical Summary

Problems solved by technology

However, voltage transformers need to be electrically isolated. In recent years, with the development of power systems, the defects of traditional voltage transformers have become more and more obvious; Hall voltage sensors are developed based on the Hall effect and are widely used in power, electronics, and AC frequency conversion. Speed ​​regulation, inverter device, electronic measurement and switching power supply and many other fields, but the interchangeability is poor, the output signal changes with temperature, and the linearity is poor; the optical voltage sensor uses the optical signal as the carrier to load and measure the voltage signal, this type The sensor is an insulating structure, which has application advantages such as strong anti-interference ability and large dynamic range

However, due to problems such as temperature stability and repeatability, the mass production and commercial application of existing photovoltage sensors are limited.

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