Digital load cell and weighing system

A digital load cell, comprising:

• a strain bridge comprising a Wheatstone bridge formed by connecting four resistive strain gauges and a temperature sensing resistance element connected in series to the Wheatstone bridge;
• an analog-to-digital conversion circuit configured to excite the strain bridge, wherein the analog-to-digital conversion circuit comprises a plurality of input channels and an output terminal, the input channels are configured to receive feedback signals from the strain bridge, and the output terminal is configured to output the feedback signals after analog-to-digital conversion;
• a signal processor comprising a load force calculation unit and a state information matrix calculation unit, wherein the load force calculation unit is configured to calculate a differential voltage and a compensation function based on the feedback signals obtained from the output terminal of the analog-to-digital conversion circuit, and is configured to calculate a load force value based on the differential voltage and the compensation function, and the state information matrix calculation unit is configured to calculate real-time voltage values of the four resistive strain gauges based on the feedback signals obtained from the output terminal of the analog-to-digital conversion circuit, and is configured to calculate a state information matrix based on the real-time voltage values and the load force value;
• and
• a state monitoring circuit configured to obtain and transfer state monitoring information of the digital load cell to the signal processor;
• wherein the state monitoring circuit comprises a strain bridge monitoring circuit, and the strain bridge monitoring circuit is configured to monitor an excitation voltage of the strain bridge;
• wherein the state monitoring circuit comprises a reference load circuit, so that the analog-to-digital conversion circuit is configured to be switched switching to the reference load circuit.