CN203965862U

CN203965862U - A kind of multi pass acquisition apparatus

Info

Publication number: CN203965862U
Application number: CN201420354517.6U
Authority: CN
Inventors: 吴贵森
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-06-30
Filing date: 2014-06-30
Publication date: 2014-11-26
Anticipated expiration: 2024-06-30

Abstract

The utility model relates to a kind of multi pass acquisition apparatus, include power circuit, signal acquisition module, signal amplification circuit, single-chip minimum system, A/D signal conversion module and serial port module, the output signal of described power circuit is transferred to signal acquisition module, signal amplification circuit and single-chip minimum system, the output signal of described signal acquisition module is sent to signal amplification circuit, the output signal of described signal amplification circuit transfers to serial port module through A/D signal conversion module, the utility model adopts electric current to carry out signal transmission, it is not easy to be disturbed, and current source internal resistance is infinitely great, conductor resistance is connected on does not affect signal accuracy in loop.

Description

A kind of multi pass acquisition apparatus

Technical field

The utility model relates to electronic circuit field, particularly be a kind of multi pass acquisition apparatus.

Background technology

Along with industrial expansion, the maturation of automatic control and computer technology, the automaticity of process equipment is greatly improved, various opertaing devices and control technology are all widely used, greatly improved the efficiency of processing and manufacturing, certainly this efficient production is also had higher requirement to the accuracy of detection limit and real-time, the data acquisition system (DAS) that the active demand of robotization industry is simple and practical, continuous variation in data acquisition demand, the deficiency of traditional pure hardware collector systems ability aspect data processing is more and more obvious, data acquisition system (DAS) adopts the mode of software and hardware combining more now.In industry, the signal gathering is the long line transmission of voltage signal after treatment, but in transmitting procedure, be easy to be subject to the interference of noise, the distributed resistance of transmission line can produce voltage drop by formula signal simultaneously, and impact gathers with the error of the result of analyzing very large.

Utility model content

The purpose of this utility model is to address the above problem, and a kind of multi pass acquisition apparatus is provided.

The utility model solves the technical scheme that its technical matters adopts: a kind of multi pass acquisition apparatus, include power circuit, signal acquisition module, signal amplification circuit, single-chip minimum system, A/D signal conversion module and serial port module, the output signal of described power circuit is transferred to signal acquisition module, signal amplification circuit and single-chip minimum system, the output signal of described signal acquisition module is sent to signal amplification circuit, and the output signal of described signal amplification circuit transfers to serial port module through A/D signal conversion module.

Described signal acquisition module gathers 4-20mA current signal by current/voltage dial-up selector switch.

Described signal amplification circuit adopts AD8539 chip.

Described A/D signal conversion module adopts TM7705 chip.

Described single-chip minimum system adopts ATMEGA8 chip.

By adopting above-mentioned technical scheme, the beneficial effects of the utility model are: the utility model adopts electric current to carry out signal transmission, and it is not easy to be disturbed, and current source internal resistance is infinitely great, and conductor resistance is connected on does not affect signal accuracy in loop.

Accompanying drawing explanation

Fig. 1 is frame assumption diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the utility model.

As shown in Figure 1, a kind of multi pass acquisition apparatus of the present utility model, include power circuit, signal acquisition module, signal amplification circuit, single-chip minimum system, A/D signal conversion module and serial port module, the output signal of described power circuit is transferred to signal acquisition module, signal amplification circuit and single-chip minimum system, the output signal of described signal acquisition module is sent to signal amplification circuit, and the output signal of described signal amplification circuit transfers to serial port module through A/D signal conversion module.The voltage of power circuit generation+5V ,+3.3V is all parts power supply, signal acquisition module image data is sent to signal amplification circuit, through amplification, transfer to A/D signal conversion module, signal after conversion is sent to single-chip minimum system and processes, then subsequent treatment and analysis are carried out in transmission through serial port module.

The utility model adopts 4-20mA current acquisition, and the spark energy that the current switching of 20mA causes is not enough to the gas that ignites, and guarantees safety, reliable; And minimum employing 4mA does not select 0mA, be mainly whether to break in order to detect, when transmission line is because of failure to trip, electric current is 0, normal work is can be lower than 4mA, so maintain easily and detection failure.

As shown in Figure 2, described signal acquisition module gathers 4-20mA current signal by current/voltage dial-up selector switch, when collection signal is unlike signal, toggle switch is pushed to different gears, to transmit, and transmits signals to signal amplification circuit.

Described signal amplification circuit adopts AD8539 chip, this chip has low-power consumption, high precision, and auto-reset function, mainly that the signal that signal acquisition module is gathered amplifies, it in native system, is multichannel amplification, different signals is sent into different ports, reach fast, accurately and amplify, and be sent to A/D signal conversion module.

Described A/D signal conversion module adopts TM7705 chip, this chip is for intelligent system, micro-control controller system and the ideal product based on dsp system, it is the analog input of binary channels fully differential, with a difference benchmark input, the signal of input range from 0-+20mV to 0-+2.5V processed, work very stable, and can directly accept the low imput from sensor, then produce the numeral output of serial.In native system, its principle is, by signal amplification circuit amplifying signal, through TM7705 chip, carries out analog to digital conversion, sends single-chip minimum system to.

Single-chip minimum system of the present utility model, as the core control section of whole system, adopts the extremely low ATMEGA8 chip of power consumption, completes issuing and controlling of various instructions, and periphery is connected to crystal oscillator, and the clock signal of standard is provided, and makes it all parts synchronous.

Above-described is only a preferred embodiment of the present utility model, can not limit the scope that the utility model is implemented, and every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.

Claims

1. a multi pass acquisition apparatus, it is characterized in that: include power circuit, signal acquisition module, signal amplification circuit, single-chip minimum system, A/D signal conversion module and serial port module, the output signal of described power circuit is transferred to signal acquisition module, signal amplification circuit and single-chip minimum system, the output signal of described signal acquisition module is sent to signal amplification circuit, and the output signal of described signal amplification circuit transfers to serial port module through A/D signal conversion module.

2. a kind of multi pass acquisition apparatus according to claim 1, its feature exists: described signal acquisition module gathers 4-20mA current signal by current/voltage dial-up selector switch.

3. a kind of multi pass acquisition apparatus according to claim 1 and 2, its feature exists: described signal amplification circuit adopts AD8539 chip.

4. a kind of multi pass acquisition apparatus according to claim 1 and 2, its feature exists: described A/D signal conversion module adopts TM7705 chip.

5. a kind of multi pass acquisition apparatus according to claim 1 and 2, its feature exists: described single-chip minimum system adopts ATMEGA8 chip.