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Resistive Strain Digital Load Cell with Fault Detection

A technology of resistance strain type and weighing sensor, which is applied in the field of weighing sensor and can solve the problems of judging the working state of the sensor and so on

Active Publication Date: 2019-02-15
无锡研测技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the Wheatstone full-bridge equal-arm circuit has only one output, when the load cell has quality problems (such as strain gauge falling off, etc.), the working status of the sensor cannot be judged only by the data of the sensor.

Method used

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  • Resistive Strain Digital Load Cell with Fault Detection
  • Resistive Strain Digital Load Cell with Fault Detection
  • Resistive Strain Digital Load Cell with Fault Detection

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0017] Such as figure 1 Shown: In order to detect in real time whether the weighing sensor breaks down, the present invention includes a measuring circuit for inductive strain, the measuring circuit adopts a Wheatstone full-bridge equal-arm circuit 12, and the Wheatstone full-bridge equal-arm The first input lead 1, the second input lead 2, the first output lead 3 and the second output lead 4 are set on the circuit 12, and the full-bridge equal-arm output voltage U can be obtained through the first output lead 3 and the second output lead 4. o ; Also includes a weighing processor 8 for signal processing, said weighing processor 8 obtains the bridge arm output voltage U through the first output lead 3 and the second input lead 2 o1 ;

[0018] Weighing processor 8 pairs of full bridge equal arm output voltage U o And the bridge arm output voltage U o1 Both pe...

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Abstract

The present invention relates to a resistance strain digital weighing sensor with fault detection. The sensor comprises a measurement circuit, the measurement circuit employs a Wheatstone full-bridge equal-arm circuit which is provided with a first input lead, a second input lead, a first output lead and a second output lead, and the full-bridge equal-arm output voltage Uo is obtained through the first output lead and the second output lead; the sensor also comprises a weighing processor for signal processing, wherein the weighing processor obtains bridge arm output voltage Uo1 through the first output lead and the second input lead; and the weighing processor performs first-order differential of the full-bridge equal-arm output voltage Uo and the bridge arm output voltage Uo1, and employs the size relation of the first-order differential of the full-bridge equal-arm output voltage Uo and the first-order differential of the bridge arm output voltage Uo1 to perform fault detection determination. The resistance strain digital weighing sensor with the fault detection can realize measurement of the required weight, can detect whether the weighing sensor has faults or not in real time, and is safe and reliable.

Description

technical field [0001] The invention relates to a digital weighing sensor, in particular to a resistance strain type digital weighing sensor with fault detection, belonging to the technical field of weighing sensors. Background technique [0002] At present, most of the measurement circuits used in resistance strain gauge load cells are Wheatstone full-bridge equal-arm circuits. When the load cell is under pressure, the resistance of some strain gauges becomes larger, and the resistance of the rest of the strain gauges becomes smaller. The resistance change is converted into a voltage change through the Wheatstone full-bridge equal-arm circuit, and the pressure is obtained by processing the output voltage. That is, the size of the weighing object. Since the Wheatstone full-bridge equal-arm circuit has only one output, when the load cell has quality problems (such as strain gauge falling off, etc.), the working status of the sensor cannot be judged only by the data of the se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01G3/13G01G23/01
CPCG01G3/13G01G23/01
Inventor 王卫东刘洋
Owner 无锡研测技术有限公司
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