Interchangeability design circuit for pressure sensor of nonstandard signal output

Abstract

The invention belongs to the pressure sensor technology, and provides an interchangeability design circuit for a pressure sensor of nonstandard signal output. The interchangeability design circuit comprises three parts which are a pressure sensor, a power supply and acquisition interface circuit and a transmission cable. The pressure sensor circuit part achieves compensation of a pressure sensitive bridge output signal temperature error through serial connection of a diode group and a precision resistor network, and establishes a function relation among three parameters of the output voltage, input voltage, and power supply voltage of the pressure sensor. A series voltage division resistor is introduced into the power supply and acquisition interface circuit, the voltage after division of the series voltage division resistor is taken as the power supply voltage Ui of the sensor and is transmitted to an acquisition system together with an output signal Uo of the pressure sensor, so as to solve the pressure value P through the above function relation expression. The transmission cable is used for electrical connection between the pressure sensor and the power supply and acquisition interface circuit. The circuit enables different pressure sensors and different power supplies to be matchable and interchangeable.

Description

technical field [0001] The invention belongs to pressure sensing technology and relates to an interchangeable design circuit of a pressure sensor with non-standard signal output. Background technique [0002] A pressure sensor is a sensor that converts the pressure signal to be measured into an electrical signal, and manages the electrical signal to a computer or acquisition system. The development of the aviation industry requires that the pressure sensor can meet the needs of multi-point pressure monitoring and redundant backup of the system, and has the characteristics of simple structure and high reliability. At present, a high-precision regulated power supply is generally a necessary condition for a high-precision pressure sensor, and a high-precision stable power supply is usually provided by the system or a high-precision regulated power supply is designed inside the pressure sensor; this undoubtedly increases the pressure of the acquisition system and the pressure se...

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Problems solved by technology

At present, a high-precision regulated power supply is generally a necessary condition for a high-precision pressure sensor, and a high-precision stable power supply is usually provided by the system or a high-precision regulated power supply is designed inside the pressure sensor; this undoubtedly increases the pressure of the acquisition system and the pressure sensor. Complexity, especially under the condition of multi-point pressure monitoring, the complexity of the overall circuit will greatly reduce the reliability of the pressure acquisition system, which cannot meet the application requirements of the aviation industry

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