High-precision controllable analog total air temperature signal device

A signal device, high-precision technology, applied in the field of high-precision and controllable simulated total atmospheric temperature signal device, can solve the problems of damaged service life, affect network accuracy, reduce system reliability, etc., achieve short action time and improve reliability , long service life effect

Pending Publication Date: 2018-12-18
AIR FORCE ENG UNIV OF PLA AIRCRAFT MAINTENACE MANAGEMENT SERGEANT SCHOOL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many disadvantages of adopting the serial method:
[0006] First, the series resistor network is less reliable
When a resistor fails, it will reduce the reliability of the entire system
Moreover, the series resistance network adopts relays. When the total temperature resistance is input to the air data computer, the output resistance value of the resistance network is required to change continuously, and the relay operates continuously, and its service life will be damaged, which will also reduce the reliability of the system.
[0007] Second, the series resistor network has low accuracy
With the continuous action of the relay, the resistance value of its contacts will change, thus affecting the accuracy of the entire network

Method used

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Embodiment 1

[0031] like figure 1 As shown, the present invention provides a high-precision controllable simulated total atmospheric temperature signal device, including a main control computer, a data acquisition card, an analog switch, and a parallel resistor network. The parallel resistor network adopts 16 weighted resistor parallel branches, and the analog switch It is electrically connected with various resistors, and the data acquisition card is provided with an I / O port, and the I / O port controls an analog switch through an output digital quantity, and the main control computer is electrically connected with the data acquisition card through a bus. The parallel resistance network of this device adopts 2 times the weight resistance parallel network, the data acquisition card adopts the PCL-722 model, the analog switch adopts the MX4601 chip produced by MAXIM Company of the United States, and the bus adopts the RS-485 bus. The parallel resistor network is arranged on the PCB, and the ...

Embodiment 2

[0051] Embodiment 1 is basically the same as Embodiment 2. The difference is that an isolation chip is set between the data acquisition card and the analog switch, and the I / O port of the data collector is controlled and connected to the analog switch through the isolation chip. The isolation chip adopts The four-channel general-purpose digital isolator ADUM1400 produced by American ADI Company, the TTL level signal output by PCL722 enters the input terminal of the isolator of ADUM1400, and the output terminal of the isolator of ADUM1400 is connected with the control terminal of the MX4601 analog switch to control 4 analog switches. The purpose of adding an isolation chip is to strengthen the anti-interference ability of the hardware. An isolation chip is added between the I / O port of the PCL-722 and the MX4601. Its function is to block the signal interference between the main control computer and the MX4601. Such as image 3 The schematic block diagram of the controllable ana...

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Abstract

The invention provides a high-precision controllable analog total air temperature signal device. The device comprises a master control computer, a data collection card, an analog switch, and a parallel resistor network; the parallel resistor network is realized by adopting a way of connecting multiple weighted resistors in parallel; the analog switch is electrically connected with each resistor; an I / O port is arranged on the data collection card, and the I / O port controls the analog switch through output digital quantity, and the master control computer is electrically connected with the datacollection card through a bus. By adopting the parallel resistor network and replacing a relay with the analog switch, the precision of the analog sensor resistor is guaranteed on the basis of improving the reliability.

Description

technical field [0001] The invention relates to a signal source device, in particular to a high-precision controllable simulated total atmospheric temperature signal device. Background technique [0002] The total temperature signal is one of the basic input signals of the air data computer, which is given in the form of resistance. The output resistance of the total temperature sensor corresponds to the total temperature of the atmosphere one by one, and the resistance range is 220Ω to 420Ω. [0003] When testing the air data computer of the aircraft, it is necessary to provide the required total temperature signal to the air data computer, and the accuracy of the resistance given is not greater than 0.37%. At present, the use of digital circuits to build resistance networks mostly adopts the method of series connection to realize arbitrary precision resistance, and most of the realization methods are 8421BCD code structure. The calculation method is easy to realize, has c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/24215
Inventor 焦准钱坤龚询詹磊廖开俊
Owner AIR FORCE ENG UNIV OF PLA AIRCRAFT MAINTENACE MANAGEMENT SERGEANT SCHOOL
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