Non-linear compensation circuit of pressure sensor

Abstract

The invention relates to a non-linear compensation circuit of a pressure sensor, and the circuit carries out non-linear compensation through a hardware technology. The compensation circuit comprises an excitation voltage source Vr, a non-linear compensation operation circuit, a pressure sensor bridge and a signal amplifying circuit; the output end of the signal amplifying circuit is divided by a division resistor R1 and a division resistor R2 and is connected with the input negative end of the non-linear compensation operation circuit through an input resistor R3; the excitation voltage source Vr is connected to the input positive end of the non-linear compensation operation circuit through an input resistor R5; a pressure signal sensed by the pressure sensor bridge is amplified by the signal amplifying circuit and is combined with the excitation voltage source Vr in appropriate proportion by changing the ratio of the division resistors, so as to supply power to the pressure sensor bridge and realize the non-linear compensation to the pressure sensor; and in addition, the zero and full scale of the signal amplifying circuit can be debugged by numbers, so that the impact of low precision and poor stability caused by the change of the resistor during a debugging process is reduced, and the low-cost and high-precision pressure measurement can be realized.

Description

technical field [0001] The invention relates to the field of pressure sensors, in particular to a compensation circuit of the pressure sensor. Background technique [0002] Pressure sensors are widely used measuring instruments in various fields such as industrial process, meteorology, environmental protection and even national defense engineering. Due to the limitation of materials and process technology, most pressure sensors, especially bridge (resistance) output sensors, when the pressure signal changes linearly When , the output voltage of the sensor is not linear, which will bring an error close to 1%, making the measurement accuracy of the sensor very low. [0003] For pressure sensors with nonlinear characteristics, there are two existing processing methods. One is to directly amplify the output signal of the sensor without nonlinear compensation and send it to the subsequent display instrument or control system. The premise is that the measurement accuracy is limite...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the above-mentioned problems of low measurement accuracy and high cost in existing pressure sensors, and provides a nonlinear compensation circuit for pressure sensors. mass production of

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