Gain preset method of collecting double-channel analog-digital joint mode variable gain data
A channel, idle channel technology, applied in gain control, reversible analog/digital converter, amplification control, etc., can solve the adverse effects of data acquisition speed, accuracy, data consistency and bandwidth, waiting for the gain circuit to stabilize and valid data Loss and other problems, to achieve the effect of eliminating circuit setup time, improving response speed, and high speed
Inactive Publication Date: 2013-06-12
HENAN UNIV OF SCI & TECH
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[0004] The purpose of the present invention is to provide a gain preset method for dual-channel analog-digital combined variable gain data acquisition, to solve the defects such as loss of valid data and waiting for the stability of the gain circuit in the general gain change process, and the resulting The adverse effects on data acquisition speed, accuracy, data consistency and bandwidth, etc., so as to achieve high-speed, high-precision data acquisition
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[0018] The principle block diagram of the embodiment of the present invention is as figure 1 As shown, the data acquisition system includes a primary amplification conditioning circuit, two parallel amplification circuits, an A / D conversion module, and a digital control module.
[0019] The specific steps of the gain preset method of the present invention are as follows:
[0020] (1) The measured signal is input into the primary amplification and conditioning circuit for preliminary amplification and conditioning;
[0021] (2) The signal after initial amplification and conditioning is sent to two parallel amplification circuits at the same time, and the signals amplified by two program-controlled amplifiers with different amplification factors are respectively sent to the corresponding channels in the A / D conversion module;
[0022] (3) The A / D conversion module converts the input two-channel analog signal into digital quantity and sends the digital quantity to the digital co...
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The invention relates to a gain preset method of collecting double-channel analog-digital joint mode variable gain data. The method comprises the following steps: measured signal is amplified and conditioned preliminarily by a primary amplification conditioning circuit and then is sent to two parallel programmable amplifiers to amplify and send to the corresponding channels of A / D converters, a digital control module reads and stores the A / D conversion value of one channel, and a digital signal processor (DSP) compares the collected data with the history data, predicts the change trend of signal and presets the gain of the other idle programmable amplifier so that when the change of signal exceeds a preset threshold, the sampling value of the other channel with the preset gain is adopted.Therefore, the defect that the circuit establishment time required by gain is changed temporarily in the traditional collection method, thus effective information can not lose, the measured signal can be in the optimum measuring range and then the data collection requirements of high speed and high accuracy can be satisfied.
Description
technical field [0001] The invention relates to a method for presetting the gain of a dual-channel data acquisition circuit by using a combination method of an analog circuit and a digital circuit, and belongs to the technical field of data acquisition. Background technique [0002] In industrial control and intelligent measurement systems, some signals vary greatly. If the gain of the amplifier circuit is not suitable, the amplitude of the weak signal may still be small after being amplified, and the amplitude of the large signal may exceed A / In this way, the accuracy of the A / D converter cannot be utilized to the maximum extent, resulting in large measurement errors and even damage to the A / D device. In order to obtain higher measurement accuracy and consistency, it is necessary to require the signal processing circuit to change the gain correspondingly with the change of the state of the measurement and control object, so that the measured analog quantity matches the A / D...
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IPC IPC(8): H03G3/20H03M1/02
Inventor 库祥臣韩红彪马伟段明德李伦刘永纲
Owner HENAN UNIV OF SCI & TECH