Circuit for normalized compensation of diffused silicon pressure sensor by using thermosensitive resistor

Abstract

The invention belongs to the technical field of pressure transmitters, and particularly relates to a circuit for normalized compensation of a diffused silicon pressure sensor by using a thermosensitive resistor. The circuit comprises a compensation type circuit, wherein the compensation type circuit comprises a bridge type circuit of the diffused silicon pressure sensor; firstly, a current input end or a voltage input end of the bridge type circuit is connected with a first resistor R1 in series; then a second resistor R2 is arranged to be connected with the first resistor R1 and the bridge type circuit in parallel; and a thermosensitive resistor Rt is also arranged to be connected with the first resistor R1. The circuit is characterized in that a third resistor R3 is connected between the thermosensitive resistor Rt and the first resistor R1 in series, and then a fourth resistor R4 is arranged to be connected with the thermosensitive resistor Rt and the first resistor R1 in parallel. Since a temperature coefficient compensation network is added in an original resistor compensation network, the circuit has the advantages of adjustability, wide compensation range and high compensation accuracy.

Description

technical field [0001] The invention belongs to the technical field of pressure transmitters, and in particular relates to a normalized compensation circuit using a temperature-sensitive resistor to adjust the temperature-sensitivity coefficient of a diffused silicon pressure sensor. Background technique [0002] Diffused silicon pressure sensors are used in many industrial control instruments and are the main raw material for pressure transmitters. The diffused silicon pressure sensor directly senses the measured medium, the bridge in the pressure sensor senses the external pressure, the resistance value changes, and the mV signal output by the sensor is proportional to the pressure. [0003] However, the output of the sensor is greatly affected by the temperature. When the ambient temperature changes greatly, the output signal will change greatly, resulting in the instrument not being able to measure the correct pressure value. Contents of the invention [0004] The inv...

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Problems solved by technology

[0003] However, the output of the sensor is greatly affected by the temperature. When the ambient temperature changes greatly, the output signal will change greatly, resulting in the instrument not being able to measure the correct pressure value.

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