A/D collection method and device based on single chip microcomputer

A collection method and single-chip technology, applied in computer control, control/regulation systems, instruments, etc., can solve the problem of limited number of bits collected by A/D collection chips

Pending Publication Date: 2019-07-05
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, limited by the technical level and cost, it is very limited to increase the number of acquisition bits of the A / D acquisition chip, especially the integrated AD unit in the single-chip microcomputer.

Method used

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  • A/D collection method and device based on single chip microcomputer
  • A/D collection method and device based on single chip microcomputer

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Embodiment

[0033] see figure 1 , a high-resolution voltage signal A / D acquisition device based on a single-chip microcomputer according to an embodiment of the present invention, comprising: an interval discrimination circuit 1, a reference voltage selection circuit 2, a multi-stage voltage divider circuit 3, a differential amplifier circuit 4, and an interval identification input circuit 6 and MCU module 5 (including at least AD unit and digital input unit).

[0034] In this embodiment, the multi-stage voltage divider circuit 3 divides the voltage U to be measured i The interval range (0-10V in this embodiment) is equally divided into 10 sub-intervals (0, V i1 ), (V i1 , V i2 ),……, (V ik-1 , V ik ),……, (V i9 , V i10 ), where 1≤k≤10, the output voltages are V ik = 1V, 2V, ..., 10V. The input terminal of the multi-stage voltage divider circuit 3 is connected to the interval voltage (10V in this embodiment) of the preset voltage to be measured, and its segment output end is respec...

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Abstract

The invention discloses an A/D collection method and device based on a single chip microcomputer. The method comprises the following steps: dividing an interval range of a preset to-be-tested voltagevalue into N sub-intervals; comparing the actual to-be-tested voltage with an upper limit voltage of the interval, and classifying the actual to-be-tested voltage into the sub-interval K; differencingthe actual to-be-tested voltage with the upper limit voltage of the sub-interval K to obtain a difference, wherein the obtained difference is amplified to obtain an amplification signal; performing AD sampling on the obtained amplification signal through the single chip microcomputer, and converting into a voltage value; and differencing the upper limit voltage value of the sub-interval K and thevoltage value obtained through the sampling and conversion of the single chip microcomputer AD to acquire an actual numerical value of the to-be-tested value. Through the A/D collection method and collection device disclosed by the invention, the collection resolution is improved for several times on the basis of the sampling resolution of the AD unit integrated in the single chip microcomputer.

Description

technical field [0001] The invention belongs to the technical field of single-chip AD acquisition, in particular to an A / D acquisition method and device based on a single-chip microcomputer. Background technique [0002] In the remote analog quantity control mode, most of them use single-chip microcomputer to realize A / D acquisition; the acquisition accuracy of voltage signal generally depends on the acquisition digits of A / D acquisition chip, the higher the acquisition digits, the higher the signal acquisition accuracy; if The number of acquisition bits of the A / D acquisition chip is n, and the voltage acquisition interval is (0, V), then the minimum acquisition accuracy of the A / D acquisition chip is δ=V / (2n-1). [0003] At present, limited by the technical level and cost, it is very limited to increase the number of acquisition bits of the A / D acquisition chip, especially the integrated AD unit in the single-chip microcomputer. [0004] To sum up, there is an urgent need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/21137
Inventor 同志学吴晓君康智强解妙霞张红
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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