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Analog Acquisition Circuit Based on Photoelectric Isolation

A collection circuit, optoelectronic isolation technology, applied in the direction of logic circuits using optoelectronic devices, logic circuits using specific components, etc., can solve the problems of transmission accuracy and linearity that are difficult to meet requirements, and achieve simple structure, no delay, good Effects of Linearity and Reliability

Active Publication Date: 2018-04-13
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the isolation of digital signals, the use of general optocoupler devices can achieve good results. For the isolation of analog signals, the transmission accuracy and linearity in conventional designs are difficult to meet the requirements; and the current analog acquisition circuits can only handle Unipolar (positive-valued) analog signal

Method used

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  • Analog Acquisition Circuit Based on Photoelectric Isolation
  • Analog Acquisition Circuit Based on Photoelectric Isolation
  • Analog Acquisition Circuit Based on Photoelectric Isolation

Examples

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Such as Figure 1 to Figure 3 As shown, the analog acquisition circuit based on photoelectric isolation in this embodiment includes a primary circuit 1 and a secondary circuit 2, the primary circuit 1 includes a positive analog input circuit 11 and a negative analog input circuit 12,

[0026] Such as figure 1 As shown, the positive value analog input circuit 11 includes the first operational amplifier U1, the input diode D1A of the first optocoupler D1 and the feedback diode D1C, the positive pole of the input diode D1A is connected to the power supply VCC, and the negative pole is connected to the first operational amplifier U1 The output terminals are connected, the inverting input terminal of the first operational amplifier U1 is connected to the signal input terminal Vin and the negative pole of the feedback diode D1C, the non-inver...

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Abstract

The invention discloses an analog quantity acquisition circuit based on photoelectric isolation, which includes a primary side circuit and a secondary side circuit. The primary side circuit includes a positive analog quantity input circuit and a negative value analog quantity input circuit. The primary side circuit The positive analog quantity input circuit and the negative analog quantity input circuit collect the positive analog quantity signal and the negative analog quantity signal, and then output through the secondary side circuit after being photoelectrically isolated. The analog quantity acquisition circuit based on photoelectric isolation of the present invention has the advantages of simple structure, input and output photoelectric isolation and the ability to process bipolar analog quantity signals.

Description

technical field [0001] The invention mainly relates to the technical field of signal acquisition, in particular to an analog quantity acquisition circuit based on photoelectric isolation. Background technique [0002] Equipment such as high-voltage inverters, soft starters, SVG, and SVC are widely used in the industrial field. Most of these equipment need to measure physical signals such as temperature, voltage, current, and water pressure. The physical signal is converted into an analog signal through a sensor, and finally converted into a digital signal through an analog / digital conversion and sent to a processor for system control. [0003] The same device often needs to measure multiple and various types of physical signals. How to eliminate the mutual interference between the various acquisition channels and between the input and output of the acquisition channels is a problem that must be paid close attention to. In addition, in order to improve the anti-interference ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/14
Inventor 徐振曹洋杨磊初蕊王桂华曾迪晖
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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