Automatic compensating signal acquiring system

Abstract

The invention discloses an automatic compensating signal acquiring system, which comprises a power module, a microcontroller, a reference circuit, an A / D switching circuit, a hardware filtering circuit, an amplifying circuit, a weighing sensor and a compensating module, wherein the compensating module comprises an analog switching circuit and a divider circuit, the weighing sensor outputs a pair of feedback signals to the divider circuit and the reference circuit, the reference circuit is used for adjusting an input impedance and outputting a reference voltage to the A / D switching circuit according to the feedback signals, the divider circuit is used for carrying out voltage division on the feedback signals to generate a reference signal, and the analog switching circuit is used for alternatively collecting an output signal of the weighing sensor and the reference signal of the divider circuit to determine a circuit deviation for realizing circuit compensation. According to the automatic compensating signal acquiring system, the pair of feedback signals is added through a six-wire connection, and the divider circuit and the analog switching circuit are matched for acquiring and processing the signals of the system for realizing the circuit compensation, thus precision and accuracy of the automatic compensating signal acquiring system are greatly improved.

Description

technical field [0001] The invention relates to the field of industrial automation, in particular to an automatic compensation signal acquisition system for precision weighing equipment. Background technique [0002] With the rapid development of electronic technology, the industrial automation system guides the rapid development of various control technologies to a faster, more precise and more accurate direction. In the industrial field that realizes automatic control by collecting real-time weight values, such as roads and bridges, construction, chemical industry, feed, fertilizer, metallurgy, etc., all kinds of sites that need to realize automatic control of packaging, batching, weighing, and force measurement are generally set. There is a weight signal acquisition system to realize automatic control. Such as figure 1 As shown, the above-mentioned weight signal acquisition system generally includes a reference circuit 16, a load cell 15, a signal amplification circuit ...

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Problems solved by technology

[0003] However, based on the above-mentioned weight signal acquisition system, in the process of real-time data acquisition, due to the unstable characteristics of each part of the circuit in the system, such as the internal impedance of the cable and the interference caused by long-distance transmission; Changes in magnification caused by temperature drift and creep; temperature drift and creep of the A / D chip itself, etc., these factors will cause deviations between the collected data and the real value, making the accuracy and accuracy of the control system degree of insurmountable influence

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