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Self-correction AD (analogue/digital) sampling device

A sampling device and self-calibration technology, applied in the field of AD sampling, can solve the problems of wasting manpower and material resources, time-consuming and laborious, and achieve the effect of saving time and human resources

Active Publication Date: 2011-06-29
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this manual proofreading method is time-consuming and laborious, wasting a lot of manpower and material resources

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  • Self-correction AD (analogue/digital) sampling device
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  • Self-correction AD (analogue/digital) sampling device

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Embodiment Construction

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0050] The invention provides a self-correcting AD sampling device, which can automatically realize the correction of the zero drift of the AD sampling circuit, saving time and effort.

[0051] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] refer to figure 1,...

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Abstract

The invention discloses a self-correction AD (analogue / digital) sampling device which comprises a central processing module and at least one path of AD conversion module, wherein each path of AD conversion module comprises an AD sampling circuit and at least one path of selection circuit; each path of selection circuit comprises a selection switch unit, an analogue quantity input unit and a voltage reference unit; the selection switch unit selects to connect the analogue quantity input unit or the voltage reference unit according to a control command received from the central processing module; the AD sampling circuit converts the received analogue quantity input signal or voltage reference signal into a corresponding normal work digital signal or voltage reference sampling signal, and then the corresponding normal work digital signal or voltage reference sampling signal is output to the central processing module; and the central processing module compares the received voltage reference sampling signal with a pre-stored voltage reference signal, and corrects the normal work digital signal by taking the difference between the received voltage reference sampling signal and the pre-stored voltage reference signal as a correction value. By adopting the embodiment of the invention, the null drift of the AD sampling circuit can be automatically corrected in the working process, thereby saving time and labor.

Description

technical field [0001] The invention relates to the field of AD sampling, in particular to a self-correcting AD sampling device. Background technique [0002] At present, the central processing unit (CPU: Central Processing Unit) used in engineering applications is a digital chip. For analog signal input, before entering the CPU operation, it is necessary to perform AD conversion through the AD sampling circuit to convert the analog signal into digital. volume signal. [0003] The AD sampling circuit used today generally has zero drift. Even if the analog input terminal is grounded, the value sampled by the AD sampling circuit is not necessarily 0, it may be more than ten millivolts, or even tens of millivolts. In practical applications, the zero drift of the AD sampling circuit can easily lead to poor consistency of the analog sampling results. Specifically, poor consistency is reflected in the fact that different AD sampling circuits may be used to sample the same analog...

Claims

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Application Information

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IPC IPC(8): H03M1/54
Inventor 李小文陈明奎羊利芬
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD
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