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Precision correction circuit and method of multichannel voltage signal collection circuit

A technology for voltage signal acquisition and accuracy correction, applied in the field of avionics, can solve problems such as spending more time and affecting the signal sampling rate, and achieve the effect of increasing the sampling rate and ensuring the accuracy of signal acquisition.

Inactive Publication Date: 2016-03-02
SHAANXI QIANSHAN AVIONICS
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Problems solved by technology

[0005] Reference attached image 3 , in reality, the trend of the signal slows down in the later stage of establishment, and it takes more time to improve the accuracy, which affects the sampling rate of the signal

Method used

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  • Precision correction circuit and method of multichannel voltage signal collection circuit
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  • Precision correction circuit and method of multichannel voltage signal collection circuit

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Embodiment Construction

[0024] An embodiment of the invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] Please refer to Figure 4 , the accuracy correction method circuit in the multi-channel voltage signal acquisition circuit of the present invention will figure 2 The AINm channel in the existing front-end circuit shown in is changed to direct ground. That is to say, one input terminal of the multi-channel analog switch in the multi-channel analog signal acquisition circuit is grounded, another one is connected to the reference voltage source, and its voltage output is the reference voltage Vref, and the other input terminals are connected to the signal channel.

[0026] The present invention is based on the accuracy correction method of the multi-channel voltage signal acquisition circuit and adopts a fixed set-up time to acquire the voltage of the reference voltage source channel, and then switches to the ground channel for each data acquis...

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Abstract

The invention belongs to the avionics technical field and especially discloses a precision correction circuit and method of a multichannel voltage signal collection circuit which is applied to a flight data collection system. An input end of a plurality of paths of analog switches in the multichannel voltage signal collection circuit is grounded, an another path is connected with a reference voltage source, the output voltage is a reference voltage Vref, and other input ends are respectively connected with signal sources to be collected. According to the invention, the voltage of a reference voltage source channel is collected at fixed establishing time, then after the data of each signal channel n is collected, the circuit is firstly switched to the grounded channel so as to discharge charges on a distributed capacity on a public channel, and then the circuit is switched to a next signal channel n+1 to carry out data collection, so that the sampling rate is improved, and the sampling precision of the signals is simultaneously improved.

Description

technical field [0001] The invention belongs to the technical field of avionics, in particular to an accuracy correction circuit and method applied to a multi-channel voltage signal acquisition circuit in a flight data acquisition system. Background technique [0002] The flight data acquisition system needs to collect a large amount of on-board sensor data, including dozens of channels of analog voltage signals. These analog voltage signals generally require a low sampling rate. Therefore, generally, the multi-channel analog signal acquisition circuit adopts a polling method for acquisition. see figure 1 , The multi-channel analog signal acquisition circuit is composed of a front-end conditioning circuit connected in sequence, a multi-channel analog switch, a differential amplifier, an analog-to-digital converter, and an acquisition control module. [0003] In the prior art, a multi-channel analog signal acquisition circuit uses a multi-channel analog switch to select on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/0053
Inventor 田军徐闻拯
Owner SHAANXI QIANSHAN AVIONICS
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