Signal isolation transmission circuit

Abstract

The invention provides a signal isolation transmission circuit, and the circuit comprises an input signal conversion circuit used for carrying out proportional operation on a direct current input voltage signal; a signal chopper circuit which is used for converting the direct current voltage signal into a positive and negative voltage square wave pulse signal; a signal coupling circuit which is used for isolating and coupling the positive and negative voltage square wave pulse signal; a signal restoring circuit which is used for restoring the positive and negative voltage square-wave pulse signals into direct-current voltage signals; and an output signal conversion circuit which is used for proportionally amplifying the voltage signal generated by the reduction circuit and outputting the amplified voltage signal. According to the invention, a direct-current input voltage signal in the circuit is converted into a positive and negative bipolar model after passing through the chopper circuit, single-winding signal isolation transmission of the signal isolation transformer in the signal coupling circuit can be realized, and the number of windings and the number of turns of the transformer can be greatly reduced, so the size of the transformer is reduced, the production process difficulty is reduced, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to signal isolation and transmission in the industrial measurement and control industry, in particular to an isolation transmission circuit for DC voltage signals. Background technique [0002] In the industrial measurement and control industry, the signal isolation transmitter is one of the current signal isolation applications. The patent number is ZL200910038270.0, and the public date is September 9, 2009. The name is "A DC Bipolar Signal Isolation Conversion The method and its circuit of the "patent document" discloses an isolation conversion method and its circuit, such as figure 1 As shown, the isolated transmission circuit includes a first bidirectional switch circuit, a synchronous pulse circuit, a coupling transformer, and a second bidirectional switch circuit. [0003] Its circuit structure is: the primary winding of the isolation coupling transformer is connected with the first bidirectional switching device to form an...

AI Technical Summary

Problems solved by technology

[0007] The key technical point is that the signal coupling transformer works in push-pull mode, which needs to be completed by a total of four windings on the primary and secondary sides. Therefore, the number of windings in the transformer is large, and the volume and production process of the transformer are relatively complicated. The corresponding product cost, The size and design complexity will be greatly increased, which hinders the further development of this technology in terms of high frequency, small size and low cost

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