CN201233288Y - Multipath data acquisition system - Google Patents
Multipath data acquisition system Download PDFInfo
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- CN201233288Y CN201233288Y CNU2008200957249U CN200820095724U CN201233288Y CN 201233288 Y CN201233288 Y CN 201233288Y CN U2008200957249 U CNU2008200957249 U CN U2008200957249U CN 200820095724 U CN200820095724 U CN 200820095724U CN 201233288 Y CN201233288 Y CN 201233288Y
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Abstract
The utility model discloses a multi-channel data acquisition system, comprising a selector, an amplifier, an analog/digit conversion module and a central processing unit which is connected with the amplifier; wherein, the amplifier is connected between the selector and the analog/digit conversion module; the selector receives multi-channel transmission signals of a sensor and sends the multi-channel signals to the amplifier for amplification by time in the control of the central processing unit and the amplifier sends the amplified multi-channels to the analog/digit conversion module for analog/digit conversion. The system can amplify multi-channel small signals with high consistency with only one amplifier, which causes the system not to consider a plurality of ground wires, reference points in the circuit distribution with simple cabling structure and high consistency; in addition, the system can reduce the cost of the multi-channel data acquisition system to a large extent.
Description
Technical field
The utility model relates to a kind of data acquisition system (DAS), relates in particular to a kind of multi-path data acquiring system.
Background technology
At present in such as multichannel analog acquisitions such as touch-switch pressure, multiple goal temperature, electric power, common architecture design is amplified for using a route monolithic or two high linearities, high precision, the low high-end operational amplifiers that drift about to make signal behind the bridge-type of each passage, single-ended sensor, thereafter re-use the ADC that a multiplexer adds single channel analog to digital converter (ADC) or directly selects multichannel input for use, sequential control is in addition with a central processing unit (MCU DSP).In this kind hardware structure, every passage all uses independent amplifying circuit, this makes the layout cabling (the particularly arrangement of ground wire) of circuit that suitable complicacy be arranged, and the consistance of every passage also can't be reached, and the price of the high-end operational amplifier in cost aspect is high.
Summary of the invention
The utility model is exactly in order to overcome above deficiency, has proposed a kind of simple in structure, multi-path data acquiring system cheaply.
Technical matters of the present utility model is solved by following technical scheme:
A kind of multi-path data acquiring system comprises selector switch, amplifier, analog-to-digital conversion module and central processing unit, and described amplifier is connected between selector switch and the analog-to-digital conversion module, and described central processing unit links to each other with amplifier; The multichannel output signal of described selector switch receiving sensor and under the control of central processing unit timesharing multiple signals delivered to amplifier amplify, the multiple signals after described amplifier will amplify are delivered to analog-to-digital conversion module and are carried out analog to digital conversion.
Described selector switch is a multiplexer.
Described analog-to-digital conversion module is integrated in the central processing unit.
Described sensor is a pressure transducer.
The beneficial effect that the utility model is compared with the prior art is: the utility model only needs an amplifier to carry out high conforming amplification to the multichannel small-signal, this makes the utility model need not consider a plurality of ground wires and reference point on this makes the layout of circuit, wire structures is simple, consistance is strong, and can reduce the cost of multi-path data acquiring system to a great extent.And analog-to-digital conversion module of the present utility model is integrated in the central processing unit, and it is integrated and communications portion is very simple and reliable, do not have the logic control of using special-purpose analog-to-digital conversion module and the problem of data error code that feasible system software is seamless.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model embodiment;
Fig. 2 is the electrical block diagram of the selector switch of the utility model embodiment;
Fig. 3 is the electrical block diagram of the amplifier of the utility model embodiment;
Fig. 4 is the particular circuit configurations synoptic diagram of the utility model embodiment;
Embodiment
Also in conjunction with the accompanying drawings the utility model is described in further details below by concrete embodiment.
As shown in Figure 1, a kind of multi-path data acquiring system comprises selector switch, amplifier, analog-to-digital conversion module and central processing unit.Described amplifier is connected between selector switch and the analog-to-digital conversion module, and described central processing unit links to each other with amplifier.The multichannel output signal of described selector switch receiving sensor and under the control of central processing unit timesharing multiple signals delivered to amplifier amplify, the multiple signals after described amplifier will amplify are delivered to analog-to-digital conversion module and are carried out analog to digital conversion.Described analog-to-digital conversion module can be integrated in the central processing unit.
As shown in Figure 2, described selector switch is a multiplexer.Described multiplexer can be the high speed multiplexer of low-voltage, single power supply, low internal resistance.In this embodiment, the model of selecting ADI (Analog Devices) for use is that the chip of ADG706 is as selector switch; The model of selecting ADI (Analog Devices) for use is that the instrumentation amplifier of AD623 is as amplifier; The chip of model STM32F10x of selecting STMicw Electronics for use is as central processing unit, and this central processing unit inside is integrated with high speed analog-to-digital conversion (Analog/Digital Converter is called for short ADC).Central processing unit only need be finished aspect AD multiplexer is carried out the work that passage switches, and it is few to take processor resource.
With an example more specifically, the utility model is described further below.Sensor adopts pressure sensor in this example, particularly, sensor is the bridge pressure sensor of Japanese NMB Sensitive Object LSM-1K series of producing, totally 16 passages.In this example, constitute the two-way list by two ADG706 and select the formula selector switch.Because of there is the phenomenon of certain zero point drift in bridge type magnetic sensor, as in pressure sensing is used, when no any pressure on the sensor (being that pressure is 0) time, output terminal should be output as 0, but the output valve of less forward or negative sense in fact all can be arranged.Therefore when single power supply, the reference voltage of pressure signal amplifier (REF) cannot supply voltage or 0 voltage, and it should be located in the amplitude of oscillation of measured value, otherwise can lose force value.In Fig. 2, the REF of AD623 has been connected to the reference source of 2.5V, and what adopt is the mode of oppositely amplifying, so the negative sense amplitude of output is maximum when pressure is maximum, the DC voltage that is amplifier AD623 output is minimum, the amplitude that in the pressure minimum is output in 0 o'clock is for minimum, that is the DC voltage of amplifier AD623 output is for the highest, and the amplitude of oscillation of whole pressure transducer is all in the conversion range of central processing unit STM32F10x.In this example, pressure transducer, selector switch ADG706, amplifier AD623 are single 5V power supply; Central processing unit STM32F10x is single 3.3V power supply.The value of the high more ADC of the precision of voltage is accurate more.
The concrete course of work is as follows: pressure transducer is in power supply pressure differential voltage about exportable 0～2mV when being 0～500gf in this example, certainly because bridge type magnetic sensor can not be exported 0 voltage when 0 pressure, it also may export a less negative value.Because of pressure is linear dimensions, so we check and approve at the spot pressure of 0 of timing reply and 500gf, then the magnitude of voltage of the gf of unit is: 1 (gf)=(V500-V0)/500.The gain of amplifier AD623 is made as 60dB, because of the REF of amplifier AD623 connects the 2.5V reference voltage and is anti-phase amplification form, be that amplifier output voltage is about 2.5V～0.5, consider sensor drift, ceiling voltage is a little more than 2.5V but less than 3.3V, so still can obtain linear AD value at central processing unit STM32F10x, built-in 2 12 analog to digital converters of central processing unit STM32F10x, 1us switching time (16 passage), have two samplings and keep function, we are with 2.5V, 3.3V, 2.5V being design parameter (actual value can be revised automatically by software) ,～0.5 theoretical value can draw final pressure algorithm, observed pressure value=actual measurement AD value * 500/ (the AD value of AD value-0gf of 500gf); Only need 40ns the switching time of selector switch ADG706, so we still can obtain the conversion performance near 1MSPS when carrying out the pressure acquisition of 16 passages, that is to say the force value of 16 passages is carried out single acquisition only need about 16us (actual value is shorter than this value usually), in the time of 1S, can carry out the pressure conversion of 62500 all passages, change as one-period with the 10th time, the value of averaging is handled again, available pressure resolution like this is: 500/4096 * (2/3.3)=0.2 (gf), consider actual error, we still are better than 0.3gf at getable measuring accuracy, and this all is a very outstanding index in the pressure detection of the overwhelming majority.In reality test, it is that the weights of 0.1g is calibrated that zero point and 500g range value are adopted precision, and the accuracy of detection of actual measurement is better than 0.3g.
The components and parts that the utility model adopted are easily purchases part, has great advantage on the cost.And can obtain manufacturer's overall technology support aspect the central processing unit STM32F10x, maturation and complete transplantable function library are arranged aspect system software.The utility model has been realized realizing high density, high precision, high speed and need not carrying out the reliable collection of sequential and data communication in addition with the less elements device on less plate size.Compared with prior art, the utility model has many advantages, has also reduced developer's workload, at Smart Home, Industry Control, automobile automation field wide development space is arranged.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (4)
1. a multi-path data acquiring system comprises selector switch, amplifier, analog-to-digital conversion module and central processing unit, and described amplifier is connected between selector switch and the analog-to-digital conversion module, and described central processing unit links to each other with amplifier; The multichannel output signal of described selector switch receiving sensor and under the control of central processing unit timesharing multiple signals delivered to amplifier amplify, the multiple signals after described amplifier will amplify are delivered to analog-to-digital conversion module and are carried out analog to digital conversion.
2. multi-path data acquiring system according to claim 1 is characterized in that: described selector switch is a multiplexer.
3. multi-path data acquiring system according to claim 1 and 2 is characterized in that: described analog-to-digital conversion module is integrated in the central processing unit.
4. multi-path data acquiring system according to claim 3 is characterized in that: described sensor is a pressure transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200957249U CN201233288Y (en) | 2008-07-22 | 2008-07-22 | Multipath data acquisition system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200957249U CN201233288Y (en) | 2008-07-22 | 2008-07-22 | Multipath data acquisition system |
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| CN201233288Y true CN201233288Y (en) | 2009-05-06 |
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| CNU2008200957249U Expired - Lifetime CN201233288Y (en) | 2008-07-22 | 2008-07-22 | Multipath data acquisition system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011003336A1 (en) * | 2009-07-09 | 2011-01-13 | 中兴通讯股份有限公司 | Method and equipment for monitoring an optical fiber amplifier |
| CN102213956A (en) * | 2010-04-01 | 2011-10-12 | 中国商用飞机有限责任公司 | Signal acquisition system |
| CN103246629A (en) * | 2013-04-01 | 2013-08-14 | 梁翠 | Multi-channel data collection system |
| WO2015161770A1 (en) * | 2014-04-25 | 2015-10-29 | 昆山韦睿医疗科技有限公司 | Signal collection device and signal collection method |
| CN105610445A (en) * | 2015-12-21 | 2016-05-25 | 哈尔滨工业大学 | High temperature resistant multi-path measurement signal switching circuit based on time-sharing power supply technology |
| CN106125654A (en) * | 2016-08-29 | 2016-11-16 | 苏州盖恩茨电子科技有限公司 | A kind of Intelligent redundant controls formula signal picker |
| CN109595774A (en) * | 2018-11-21 | 2019-04-09 | 广东美的制冷设备有限公司 | The sample detecting circuit and air conditioner of air conditioner |
| CN110793712A (en) * | 2019-10-31 | 2020-02-14 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Union type pressure sensor high-frequency sampling device |
| CN114113765A (en) * | 2021-11-04 | 2022-03-01 | 国网冀北电力有限公司计量中心 | Device and method for measuring voltage proportion |
-
2008
- 2008-07-22 CN CNU2008200957249U patent/CN201233288Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011003336A1 (en) * | 2009-07-09 | 2011-01-13 | 中兴通讯股份有限公司 | Method and equipment for monitoring an optical fiber amplifier |
| CN102213956A (en) * | 2010-04-01 | 2011-10-12 | 中国商用飞机有限责任公司 | Signal acquisition system |
| CN103246629A (en) * | 2013-04-01 | 2013-08-14 | 梁翠 | Multi-channel data collection system |
| WO2015161770A1 (en) * | 2014-04-25 | 2015-10-29 | 昆山韦睿医疗科技有限公司 | Signal collection device and signal collection method |
| CN105610445A (en) * | 2015-12-21 | 2016-05-25 | 哈尔滨工业大学 | High temperature resistant multi-path measurement signal switching circuit based on time-sharing power supply technology |
| CN105610445B (en) * | 2015-12-21 | 2018-10-02 | 哈尔滨工业大学 | High temperature resistant multichannel measurement signal switching circuit based on time sharing power supply technology |
| CN106125654A (en) * | 2016-08-29 | 2016-11-16 | 苏州盖恩茨电子科技有限公司 | A kind of Intelligent redundant controls formula signal picker |
| CN109595774A (en) * | 2018-11-21 | 2019-04-09 | 广东美的制冷设备有限公司 | The sample detecting circuit and air conditioner of air conditioner |
| CN110793712A (en) * | 2019-10-31 | 2020-02-14 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Union type pressure sensor high-frequency sampling device |
| CN114113765A (en) * | 2021-11-04 | 2022-03-01 | 国网冀北电力有限公司计量中心 | Device and method for measuring voltage proportion |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090506 |
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| CX01 | Expiry of patent term |