Four half-bridge sensors establish ties four corners and measure electronic scale circuit

Four half-bridge sensors establish ties four corners and measure electronic scale circuit

  • CN 106,706,085 B
  • Filed: 12/29/2016
  • Issued: 01/05/2021
  • Est. Priority Date: 12/29/2016
  • Status: Active Grant
First Claim
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1. A four-half-bridge sensor series four-corner measurement electronic scale circuit comprises four resistance-type pressure sensors S1, S2, S3 and S4, wherein each of the pressure sensors S1, S2, S3 and S4 comprises two resistors R connected in series, and is characterized in that the pressure sensors S1, S4, S3 and S2 are sequentially connected in series to form a bridge having a power supply node and six signal detection points, the power supply node comprises a power supply positive electrode VDD connected with a node of the two resistors R in the S1 and a power supply negative electrode GND connected with a node of the two resistors R in the S3, and the six signal detection points are respectively:

  • a measurement terminal AI0 connected to a junction of two resistors R in the pressure sensor S4, a measurement terminal AI1 connected to a junction of two resistors R in the pressure sensor S2, a measurement terminal AI2 connected to a junction of the pressure sensor S1 and the pressure sensor S2, a measurement terminal AI3 connected to a junction of the pressure sensor S1 and the pressure sensor S4, a measurement terminal AI4 connected to a junction of the pressure sensor S2 and the pressure sensor S3, and a measurement terminal AI5 connected to a junction of the pressure sensor S3 and the pressure sensor S4;

    the measuring terminals AI2-AI5 are used for measuring the respective output values AD1, AD2, AD3 and AD4 of the four pressure sensors S1-S4 and obtaining measured values after correction;

    the corresponding relation between the output value and the measured value is as follows;

    AD=

    AD1*C/C1+AD2*C/C2+AD3*C/C3+AD4*C/C4;

    wherein, AD1, AD2, AD3 and AD4 are output values of the four pressure sensors respectively;

    AD is the measured value;

    c is a standard value;

    c1, C2, C3 and C4 are standard values of four pressure sensors;

    C/C1, C/C2, C/C3 and C/C4 are proportional relations of the four pressure sensors;

    the standard values of the four pressure sensors C1, C2, C3 and C4 are determined by adding the same weight standard valueC corrected, C1 ═

    AD 1;

    c2 ═

    AD 2;

    c3 ═

    AD 3;

    c4 ═

    AD 4.

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