Analog load cell with digital compensation

Abstract

The invention relates to an analog load cell with digital compensation. The analog load cell includes: an elastic body, which deforms according to the pressure sensed by the analog load cell; a strain gauge, which is connected to the elastic body and produces a change in resistance value according to the deformation; a strain gauge bridge, which is connected to the strain gauge, The change of the resistance value is transmitted to output the first analog signal; the analog-to-digital conversion module is connected to the output end of the strain gauge bridge of the analog load cell, receives the first analog signal from the strain gauge bridge and converts the first analog signal into a first digital signal, wherein the first analog signal is an analog signal representing weight; the analog output port outputs a second analog signal. The analog load cell also includes a signal processing and output circuit, which is connected between the output terminal of the analog-to-digital conversion module and the analog output port, and compensates the first digital signal and converts it into a second analog signal. The invention can not only realize high-precision compensation, but also keep the interface of the analog weighing sensor simple.

Description

technical field [0001] The invention relates to the field of weighing sensors, in particular to analog weighing sensors with digital compensation functions. Background technique [0002] Strain gauge analog load cell is a more commonly used analog load cell. Since almost all instruments support analog load cells, strain gauge analog load cells have the advantages of simple interface and can be directly applied to dynamic weighing occasions. However, the traditional strain gauge analog load cell compensates the zero point, sensitivity, and temperature coefficient by connecting resistors in series or in parallel on the strain gauge bridge, which can only achieve linear compensation once, and the compensation accuracy is poor. Moreover, the method of simulated compensation cannot solve the errors related to time and loading such as creep and hysteresis. [0003] In view of this, the weighing sensor in the prior art receives the analog signal from the strain gauge bridge of th...

AI Technical Summary

Problems solved by technology

[0004] However, this type of load cell has the disadvantage of requiring a dedicated digital port to output the compensated weight data, which complicates the interfacing of analog load cells and limits the universal connectability of instruments or other peripherals

Images