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Anti-electromagnetic interference airborne PT1000 acquisition pretreatment circuit

A preprocessing circuit and anti-electromagnetic interference technology, which is applied to thermometers that are directly sensitive to heat, electric/magnetic elements, electromagnetic means, and electrical devices, etc., can solve the problems of PT1000 acquisition accuracy lead resistance increase measurement error, etc. , to eliminate measurement errors, improve accuracy, and reduce interference

Active Publication Date: 2019-06-04
XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem solved by the present invention: Propose an anti-electromagnetic interference airborne PT1000 acquisition preprocessing circuit, which solves the problem that electromagnetic radiation interference affects the acquisition accuracy of PT1000 and the lead wire resistance of PT1000 increases the measurement error

Method used

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  • Anti-electromagnetic interference airborne PT1000 acquisition pretreatment circuit
  • Anti-electromagnetic interference airborne PT1000 acquisition pretreatment circuit
  • Anti-electromagnetic interference airborne PT1000 acquisition pretreatment circuit

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Embodiment Construction

[0012] The +15V input voltage is converted into a +5V high-precision voltage source by a regulated source. The +5V is directly connected to R1, and the other end of R1 is divided into two circuits, one is connected to the non-inverting input terminal of the operational amplifier, and the other is passed through the T-type filter S1 Connect to terminal A of PT1000 resistor. The output of the operational amplifier is connected to the inverting input terminal to form a voltage follower, and the inverting input terminal is connected to the ground port of the voltage regulator to ensure that the voltage at the non-inverting input terminal is always zero. At this time, the current flowing through R1 is constant 0.5mA. The voltage regulator is AD586TQ / 883B, and the operational amplifier is OP467A.

[0013] After one end A of the PT1000 resistor passes through the S2 filter, it is divided into two circuits, one through the resistor R4 as the differential voltage input terminal D, and...

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Abstract

The invention belongs to the technical field of airborne computer interfaces and relates to an anti-electromagnetic interference airborne PT1000 acquisition pretreatment circuit. The anti-electromagnetic interference airborne PT1000 acquisition pretreatment circuit is characterized in that the outermost end of an acquisition circuit is provided with a filter; and the PT1000 acquisition pretreatment circuit is particularly suitable for anti-electromagnetic interference pretreatment of an airborne electronic equipment interface. According to the PT1000 high-precision acquisition pretreatment circuit based on a T-type filter and RFI filter, electromagnetic and RFI interference on the circuit can be effectively reduced, measurement errors caused by lead resistance are eliminated, and the platinum resistance acquisition precision is improved.

Description

technical field [0001] The technology belongs to the field of airborne computer interface technology, and relates to an airborne PT1000 acquisition and preprocessing circuit for anti-electromagnetic interference. Background technique [0002] There are a large number of temperature control scenarios inside aviation and aerospace vehicles, such as temperature measurement and control of power systems and environmental control systems. The core of temperature control is temperature measurement. Since the resistance value of the thermistor can change linearly with temperature, using platinum resistance to measure temperature is an effective and high-precision temperature measurement method. But facing the following problem: [0003] 1. The resistance on the lead is easily introduced, which affects the measurement accuracy of the sensor; [0004] 2. When the aircraft is in some strong electromagnetic interference environment, the interference may be converted into DC output off...

Claims

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Application Information

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IPC IPC(8): G01K7/20
Inventor 王雯林清刘炜包健龙李爱军王晓勇
Owner XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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