A Circuit of Four Half-Bridge Sensors Connected in Series and Four Corners to Measure the Electronic Scale

Abstract

The invention discloses a four-corner measurement electronic scale circuit formed through series connection of four half-bridge sensors. The four-corner measurement electronic scale circuit comprises a bridge with a power connection point and six signal measurement points, wherein the bridge is composed of a resistive pressure sensor S1, a resistive pressure sensor S4, a resistive pressure sensor S3 and a resistive pressure sensor S2 which are sequentially connected in series. The bridge composed of four pressure sensors is measured. Moreover, the output relationship of the four pressure sensors is measured, and the output of each pressure sensor is obtained. Through four-corner calibration, the requirement on pressure sensor selecting and pairing is lowered, the first pass yield of production is increased, maintenance is simple, the four-corner unbalance loading performance of a four-point electronic scale is improved greatly, and the measurement accuracy is improved more than ten times.

Description

technical field [0001] The invention relates to a weighing apparatus, in particular to a four-point weighing electronic scale. Background technique [0002] The use of half-bridge four-point weighing is to set a pressure sensor at each of the four corners of the electronic scale, and calculate the weight through the Wheatstone balanced bridge method. The current four-point weighing electronic scale circuit such as figure 1 As shown, this circuit cannot measure the output of a single pressure sensor. The output of the four pressure sensors must be consistent in order to meet the four-leg unbalanced load. In addition to the limited output of individual selection methods, differences in installation and fixed costs, and cost reasons, the accuracy generally can only reach 1 / 200, the production pass-through rate is not high, and maintenance is troublesome. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the present invention provides...

AI Technical Summary

Problems solved by technology

The current four-point weighing electronic scale circuit such as figure 1 As shown, this circuit cannot measure the output of a single pressure sensor. The output of the four pressure sensors must be consistent in order to meet the four-leg unbalanced load. Due to the limited output of individual selection methods, differences in fixed installation and cost reasons, the accuracy can generally only reach 1 / 200, the production pass-through rate is not high, and maintenance is troublesome

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