Isolating A/D to D/A converting circuit

Abstract

The invention discloses an isolating A/D-D/A converting circuit, and its character lies in that it comprises integrating circuit, double D flip-flop comparer, MCU, isolating transformer, shaping amplifying circuit, and second order low-pass filter; the measured voltage signal is connected to the same phase input end of the integrating circuit and the output end of the integrating circuit is connected with the clear end of the double D flip-flop, and the output end of the double D flip-flop is connected with the reverse phase input end and the capture input pin of the MCU, which composes the A/D converting circuit; the output end of the isolating transformer is connected with the shaping amplifying circuit and that of the shaping amplifying circuit is connected with RC low-pass filter and second-order low-pass filter, thus composing the D/A converting circuit. The beneficial effects of the invention: it can realize high performance, low cost, low power, and miniaturization, applied to data conversion, processing and transmission of various electronic measuring and control devices for temperature, pressure, flow, PLC, etc.

Description

technical field [0001] The invention relates to an analog-digital-digital-analog conversion circuit, in particular to an isolated analog-digital-digital-analog conversion circuit applicable to various electronic measurement and control devices such as temperature, pressure, flow, and PLC. Background technique [0002] At present, most of the electronic measurement and control equipment need to convert the analog quantity into digital quantity by A / D converter. Indoor detection and control equipment. And this type of commonly used A / D and D / A converters want to achieve more than 14-bit precision. Either the cost is high, or the volume is large. It is not suitable for making low-cost, miniaturized on-site measurement and control equipment. In addition, some on-site sensors and electronic measuring equipment require isolation from the control system. If they are not isolated, there may be a potential difference between the signal reference points due to the long distance bet...

AI Technical Summary

Problems solved by technology

It's not expensive, it's bulky

Not suitable for making low-cost, miniaturized on-site measurement and control equipment

In addition, some on-site sensors and electronic measuring equipment require isolation from the control system. If they are not isolated, there may be a potential difference between the signal reference points due to the long distance between the two places, which will form a ground loop and cause signal transmission distortion.

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