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Method for isolation and conversion of direct current positive and negative signals and circuit thereof

A bipolar signal, isolation and conversion technology, applied in the direction of converting DC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problems of complex circuit structure, affecting signal conversion accuracy and temperature drift coefficient, etc. Achieve the effects of simple circuit structure, reduced product volume, and improved conversion accuracy

Active Publication Date: 2009-09-09
MORNSUN GUANGZHOU SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This implementation method is not only complicated in circuit structure, but also the accuracy and temperature drift coefficient of the reference voltage reference introduced in the adding circuit will directly affect the accuracy of signal conversion and temperature drift coefficient

Method used

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  • Method for isolation and conversion of direct current positive and negative signals and circuit thereof
  • Method for isolation and conversion of direct current positive and negative signals and circuit thereof
  • Method for isolation and conversion of direct current positive and negative signals and circuit thereof

Examples

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Embodiment Construction

[0018] Such as figure 1 As shown, a DC positive and negative bipolar signal isolation conversion circuit includes an input signal processing unit for converting the DC positive and negative bipolar voltage input signal into a DC positive and negative bipolar current signal; The transformer is used for isolating and coupling DC positive and negative bipolar signals; the isolated synchronous pulse generating circuit is used for outputting two-way isolated synchronous pulse drive control signals; the first bidirectional switching device; the second bidirectional switching device; the output signal processing unit is used for Restore the DC positive and negative bipolar current signal to DC positive and negative bipolar voltage signal output.

[0019] The input signal processing unit, the primary winding of the isolation coupling transformer and the first bidirectional switching device are connected to form an input circuit, the normally closed end and the normally open end of the...

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Abstract

The invention discloses a method for the isolation and the conversion of direct current positive and negative signals. A bi-directional switch device is arranged in a direct current positive and negative signal input loop connected with a primary coil of an isolating and coupling transformer; another bi-directional switch device is also arranged in a direct current positive and negative signal output loop connected with a secondary coil of the isolating and coupling transformer; and the synchronous switching between normal closing and normal opening of the two bi-directional switch devices are respectively controlled by two groups of synchronous pulse signals, thus the isolation and the conversion are realized. The method has the following advantages of saving an add circuit, directly adopting two bi-directional analog switch circuits to realize the isolation and the conversion of signals, reducing the error influence and the temperature drifting influence due to the introduction of the add circuit, improving the conversion accuracy of signal conversion and reducing the temperature drifting coefficient. In addition, the circuit has simple structure, therefore, the product cost is reduced, the product size is reduced, correspondingly, the production technique of the product is also simplified and the production difficulty is lowered.

Description

technical field [0001] The invention relates to a signal processing method and a circuit thereof, in particular to a method for isolating and converting DC positive and negative bipolar signals and a circuit thereof. Background technique [0002] In the field of industrial control, it is common to use DC positive and negative bipolar signals as voltage drive signals, such as PLC, transmitter, motor control, etc. In practical applications, in order to effectively suppress the common mode noise and common ground interference between the control equipment and the execution equipment, and realize the signal matching and impedance matching between the control equipment interface and the execution equipment interface, the DC positive and negative bipolar signals are usually effectively Isolate and transform to achieve the above. [0003] In the prior art, the isolation and conversion method of DC positive and negative bipolar signals is usually: firstly, the bipolar signal is con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/00H02M1/00
Inventor 赵庆红
Owner MORNSUN GUANGZHOU SCI & TECH
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