Weighing indicator

Abstract

The invention discloses a weighing indicator, which is characterized in that an AD conversion circuit comprises an analog-to-digital conversion circuit connected with a weighing sensor; an output end of the weighing sensor is connected with an analog input end of the analog-to-digital conversion circuit; the analog-to-digital conversion circuit is connected with a first bus; the weighing sensor is connected with an alternating current excitation circuit; the alternating current excitation circuit is connected with an alternating current excitation driving circuit; the alternating current excitation driving circuit is connected with the analog-to-digital conversion circuit; the alternating current excitation driving circuit is connected with an overcurrent protection circuit; the overcurrent protection circuit is connected with a restart circuit; the restart circuit is connected with the first bus; and the overcurrent protection circuit is connected with the alternating current excitation circuit. The weighing indicator has the advantages of adopting the overcurrent protection circuit to perform sampling treatment on the output of the alternating current excitation circuit and thenfeeding back a result of the sampling treatment to the alternating current excitation driving circuit, thereby realizing the reliable protection on an alternating current excitation power supply of the sensor and avoiding the damage of instruments caused by external fault.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a weighing indicator. Background technique [0002] The weighing indicator currently on the market is composed of a load cell, an electronic amplifier circuit, an analog-to-digital conversion circuit, a data processing circuit, and a display for displaying weight. When the sensor is connected, due to the influence of temperature difference and potential, the zero point will be unstable. As a result, the measurement accuracy is not high, the sensor excitation voltage has no overcurrent protection, and the reliability is poor. In addition, the existing weighing indicator still has the disadvantages of large product volume, parallel bus transmission between modules, complex wiring of the whole machine, high cost, etc., and the inability to display Chinese characters and poor man-machine interface. Contents of the invention [0003] An object of the present invention is to provide a more a...

AI Technical Summary

Problems solved by technology

[0002] The weighing indicator currently on the market is composed of a load cell, an electronic amplifier circuit, an analog-to-digital conversion circuit, a data processing circuit, and a display for displaying weight. When the sensor is connected, due to the influence of temperature difference and potential, the zero point will be unstable. As a result, the measurement accuracy is not high, the sensor excitation voltage has no overcurrent protection, and the reliability is poor

In addition, the existing weighing indicator still has the disadvantages of large product volume, parallel bus transmission between modules, complex wiring of the whole machine, high cost, etc., and it cannot display Chinese characters, and the man-machine interface is poor.

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