Chromatographic data collecting device and method based on on-chip system

Abstract

A collecting device of chroamtograph data based on the chip system includes two operation amplifiers with their input ends connected to the chromatograph and microcontroller connected with the outputends of the operation amplifiers, among which the microcontroller integrates with one chip computer, two individual A / D conversion circuits with separate channels on each and serial communication interface and sets with several input and output interfaces for switching volume, start and stop signals input into chroatograph for analysing separately, control signal of operation mode and output channel. To convert the analog signal to the digital signal for the chromatograph and to carry out the integrating calculation can be realized by only using one chip microcontroller since it contains conversion circuit in high accuracy and wide detecting range, microcontroller storage and digital interface circuit.

Description

field of invention [0001] The invention relates to a high-precision chromatographic data acquisition device and method, in particular to a high-precision chromatographic data acquisition device and method based on SOC (System On Chip) technology using a highly integrated large-scale integrated circuit. Background of the invention [0002] The traditional chromatographic data acquisition device consists of at least two parts: A / D conversion part and data transmission interface circuit part. There are roughly two types of traditional chromatographic data acquisition devices: [0003] 1. V / F (voltage / frequency) conversion components or V / T (voltage / time) conversion components convert the analog signal of the chromatograph into a frequency signal for "equal time interval" counting, integral calculation, and finally pass The single chip microcomputer or the data interface circuit transmits to the data processing device. [0004] 2. Use Σ-Δ conversion elements to convert the ana...

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Problems solved by technology

[0007] 2. For a data acquisition device composed of V / F or V / T conversion components, the accuracy and dynamic range of its A / D conversion are limited by the performance indicators of the components, so it is necessary to use different gain representations in the full range, It is difficult to improve the acquisition accuracy and manufacturing process of the system

[0008] 3. Composing a chromatographic data acquisition device with a Σ-Δ conversion circuit and a single-chip microcomputer also has disadvantages such as low integration, a large number of components, and complicated acquisition and control.

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