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High-speed optical isolation voltage sensor suitable for lightning overvoltage environment

A voltage sensor, lightning overvoltage technology, applied in the direction of voltage/current isolation, etc., can solve the problems of high cost, complex isolation design, narrow bandwidth, etc.

Inactive Publication Date: 2015-07-01
四川拓普测控科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Isolation amplifiers usually use magnetic coupling to make there is no electrical connection between the input and output of the amplifier, but this type of isolation design is complex, with narrow bandwidth, large volume, and high cost

Method used

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  • High-speed optical isolation voltage sensor suitable for lightning overvoltage environment
  • High-speed optical isolation voltage sensor suitable for lightning overvoltage environment
  • High-speed optical isolation voltage sensor suitable for lightning overvoltage environment

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Embodiment Construction

[0042] The present invention will be described in detail below in conjunction with the accompanying drawings and with the best embodiment.

[0043] refer to figure 1 Firstly, the overall operation process of the high-speed optically isolated voltage sensor is described.

[0044] Through the resistance network of the voltage attenuation unit, the pre-stage input voltage with a voltage value of ±400V is attenuated. The attenuation coefficient of the network can be fine-tuned, and the typical value is 200:1. Through the front-stage photoelectric conversion unit of the photoelectric conversion isolation system, the voltage signal is converted into an optical signal after adding a DC bias. The post-stage photoelectric conversion unit of the photoelectric conversion isolation system receives the optical signal, forms a voltage signal through its unique circuit / voltage conversion circuit, and outputs it after removing its DC bias. Finally, the output analog signal of the photoelect...

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Abstract

The invention discloses a high-speed optical isolation voltage sensor suitable for a lightning overvoltage environment. The high-speed optical isolation voltage sensor has quite high conversion speed of which the typical value is within 1 microsecond, quite low nonlinearity degree of which the typical value is below 0.01%, quite high precision of which the typical value is within 1% and 1KV isolation voltage. Analog signal attenuation is implemented by the following process that a preceding inputting voltage peak value is greatly reduced through a voltage attenuation unit, reduction of the preceding inputting voltage peak value is implemented by a resistance network, and highest preceding voltage is + / -400V; by a photoelectric conversion isolation system, preceding inputting is separated from later signal acquiring, AD (analog / digital) conversion, data storage and the like, and analog signals are transferred through two photoelectric conversion units; and outputting analog signals of the photoelectric conversion isolation system are amplified and filtered through a signal conditioning unit, and later system acquisition is facilitated.

Description

technical field [0001] The invention discloses a high-speed optical isolation voltage sensor suitable for a lightning overvoltage environment, and relates to units such as voltage signal attenuation, isolation transmission based on a high-precision linear optocoupler, and signal conditioning. Background technique [0002] In the data acquisition and control system, it is often operated under extremely harsh experimental environmental conditions. Some control systems also require long-term uninterrupted operation. In order to improve the anti-interference performance and reliability of the acquisition system, an effective method is to use analog signal isolation technology, that is, try to isolate the system under test from the measurement system, and only allow the measured signal to enter the measurement system. This technology has been widely used in the industry, and the usual isolation methods include isolation amplifier method and photoelectric isolation method. [00...

Claims

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Application Information

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IPC IPC(8): G01R15/22
Inventor 杨旻杨珣贾顺福
Owner 四川拓普测控科技有限公司
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