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Signal isolation method

A group isolation and voltage signal technology, which is applied in the field of electrical signal transmission of industrial automation instruments, can solve problems such as unstable signal output and hidden dangers of industrial control, and achieve the effect of overcoming interference

Inactive Publication Date: 2006-07-19
SHUNCHANG COUNTY HONGRUN PRECISION INSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current industrial instrument control site directly transmits the electrical signals of transmitters, frequency converters, and some actuators to the controller for control. Due to their own complex circuits, the signal output is very unstable, which is likely to cause great hidden dangers to industrial control.

Method used

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  • Signal isolation method

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Embodiment

[0017] The present invention adopts the electromagnetic isolation mode, sends the 24V power supply to the push-pull circuit, and the push-pull circuit passes through the differential amplification unit composed of two SC1008 triodes inside to make the circuit oscillate, and generates two sets of isolated voltage signals through the magnetic ring coil respectively. It is ±15V, +24V. ±15V is the power supply for the front-stage 741 operational amplifier, and +24V is the power supply for the rear-stage 741 operational amplifier. The pre-stage operational amplifier is isolated from the post-stage operational amplifier by a magnetic ring coil. The 4-20mA current signal transmitted by the actuator is sent to the pre-stage operational amplifier through the sampling resistor to generate a voltage signal, and then the signal is transmitted to the isolation coil after amplification. The isolation coil can adjust the negative feedback and linearity of the pre-stage operational amplifier...

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Abstract

The invention relates to a signal isolating method in the field of industry used automatic gadget electric signal transmission technology, which comprises the following steps: the 24V dc power generates two groups of isolating voltage signal after the oscillating of the push-pull circuit, one group provides the power to the front stage computing amplifier and the other group provides the power to the rear stage computing amplifier. It uses the magnetic ring coil to isolate the front stage computing amplifier and the rear stage computing amplifier. The 4-20mA current signal inputted by the inputting end generates the voltage signal by the sampling resistance and transmits the obtained voltage signal to the front stage computing amplifier then to the isolating coil. The isolated coil generates 4-20mA current which generates the voltage signal by the sampling resistance and transmits the obtained voltage signal to the rear stage computing amplifier to generate standard constant-current source signal and then outputs it.

Description

Technical field: [0001] The invention relates to the electric signal transmission technology of an industrial automation instrument. Background technique: [0002] The current industrial instrument control site directly transmits the electrical signals of transmitters, frequency converters, and some actuators to the controller for control. Due to their own complex circuits, the signal output is very unstable, which is likely to cause great hidden dangers to industrial control. . Invention content: [0003] The object of the present invention is to provide a signal isolation method capable of isolating signals in order to overcome the above defects. [0004] Invention scheme: [0005] The following methods are used for signal isolation between the actuator and the controller: [0006] 1. The 24V DC power supply oscillates through the push-pull circuit to generate two sets of isolated voltage signals, one for the pre-stage operational amplifier, and the other for the post...

Claims

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Application Information

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IPC IPC(8): G08C19/00
Inventor 林善平陈盛灿杨莹
Owner SHUNCHANG COUNTY HONGRUN PRECISION INSTR
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