CN109191825A - The method that data collector with self-checking function and its On-line self-diagnosis are surveyed - Google Patents
The method that data collector with self-checking function and its On-line self-diagnosis are surveyed Download PDFInfo
- Publication number
- CN109191825A CN109191825A CN201811001938.XA CN201811001938A CN109191825A CN 109191825 A CN109191825 A CN 109191825A CN 201811001938 A CN201811001938 A CN 201811001938A CN 109191825 A CN109191825 A CN 109191825A
- Authority
- CN
- China
- Prior art keywords
- signal
- self
- test signal
- analog switch
- standard self
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C25/00—Arrangements for preventing or correcting errors; Monitoring arrangements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Test And Diagnosis Of Digital Computers (AREA)
Abstract
The present invention discloses a kind of data collector with self-checking function and its On-line self-diagnosis surveys method, and data collector includes standard self-test signal source, Differential OPAMP, analog switch K1 and analog switch K2；The standard self-test signal source is for providing standard self-test signal；The Differential OPAMP is used in simulation input front end, is used as addition/subtraction device, the signed magnitude arithmetic(al) for differential input signal Va, Vc and standard self-test signal Vb, Differential OPAMP exports V1=Vb+Vc-Va, V2=Vb+Va-Vc obtains V1+V2=2Vb, V1-V2=2 (Vc-Va)；Analog switch K1 and analog switch K2 terminates the switching into standard self-test signal and access Horizon signal for the VOCM of Differential OPAMP.Circuit of the present invention is easy to use, it only needs to increase standard self-test signal at the output common mode voltage setting end pin VOCM of Differential OPAMP, the selection of standard self-test signal flexibly, can uninterrupted self-test, as a result calculating ratio does not need to occupy too many microprocessor resources to very simple yet.
Description
Technical field
The present invention relates to data collector field technology, refer in particular to a kind of data collector with self-checking function and its
The method of line self-test.
Background technique
Since electronic component is after working long hours, the performance of device can be weakened, and parameter can drift about, or even can go out
The case where now damaging.Data collector is to belong to precision equipment, and the slight error of collection result will lead to the inclined of result judgement
Difference.Judge collector input channel whether can normal acquisition data, it is often external to provide the letter of a standard to collector
Number source, in this way for being fixedly mounted or the acquisition of continual data is very inconvenient.
The self-checking function of existing data collector is to provide the voltage or sinusoidal signal of a standard mostly, certainly
Under inspection state, input signal channel is first disconnected, then accesses standard self-test signal, in this case, acquisition access has to be off, also
The acquisition to useful data is suspended, data acquisition cannot carry out simultaneously with self-test.The test signal of input can only be direct current letter
Number or sinusoidal signal one of which, circuit selection it is not flexible.
Summary of the invention
In view of this, in view of the deficiencies of the prior art, the present invention aims to provide a kind of band self-checking functions
Data collector and its method surveyed of On-line self-diagnosis, can effectively solve existing data collector data acquisition with self-test not
The problem of capable of carrying out simultaneously.
To achieve the above object, the present invention is using following technical solution:
A kind of data collector with self-checking function, including standard self-test signal source, Differential OPAMP, analog switch K1 and mould
Quasi- switch K2；The standard self-test signal source is for providing standard self-test signal；The Differential OPAMP is used in simulation input front end, uses
Make addition/subtraction device, for the signed magnitude arithmetic(al) of differential input signal Va, Vc and standard self-test signal Vb, Differential OPAMP is defeated
V1=Vb+Vc-Va out, V2=Vb+Va-Vc obtain V1+V2=2Vb, V1-V2=2 (Vc-Va)；Analog switch K1 and analog switch
K2 terminates the switching into standard self-test signal and access Horizon signal for the VOCM of Differential OPAMP, when access standard self-test letter
Number when, analog switch K1 disconnect, analog switch K2 closure, when access Horizon signal, analog switch K2 disconnection, analog switch K1
Closure acquires the common-mode signal being calculated compared with 0V when verifying input common-mode signal is 0V, and preliminary judgement acquisition access is
It is no in the ideal situation.
As a preferred embodiment, the standard self-test signal that standard self-test signal source provides is direct current signal or exchange
Signal.
As a preferred embodiment, the V1 and V2 signal pass through micro- place after back end signal pre-processes and ADC is acquired
It manages device and calculates V1+V2=2Vb, V1-V2=2 (Vc-Va) obtains useful signal Vc-Va and standard measuring signal Vb.
A method of the On-line self-diagnosis of the data collector with self-checking function is surveyed, and includes following steps:
(1) microprocessor control analog switch K1 closure, analog switch K2 are disconnected, at this time Vb=0V, and Differential OPAMP output V1=
Vb+Vc-Va, V2=Vb+Va-Vc；
(2) signal V1 and V2 pre-processes circuit by rear end, and the collected signal of ADC is respectively V1=Vb+Vc-Va, V2=Vb+
Va-Vc；
(3) it is V1-V2=2 (Vc-Va) that microprocessor, which calculates the amplitude of acquisition signal, and differential input signal is Vc-Va=(V1-
V2)/2；
(4) microprocessor calculates V1+V2=2Vb, i.e. Vb=(V1+V2)/2, and the Vb value being calculated inputs compared with 0V in common mode
In the case that voltage is 0V, tentatively judge whether in the ideal situation to acquire access；
(5) microprocessor control analog switch K2 closure, analog switch K1 disconnect, standard self-test signal be Vce, at this time Vb=
Vce, Differential OPAMP export V1=Vb+Vc-Va, V2=Vb+Va-Vc；
(6) calculated separately according to step (2), (3), (4) obtain differential input signal be Vc-Va=(V1-V2)/2, common-mode signal Vb=
(V1+V2)/2 whether the Vb, being calculated is setting within the scope of fault threshold compared with standard self-test signal Vce, to judge
Whether in the ideal situation, beyond threshold value signal input channel shows that analog channel is under malfunction, and microprocessor issues
Fault warning.
The present invention has obvious advantages and beneficial effects compared with the existing technology, specifically, by above-mentioned technical proposal
Known to:
Circuit of the present invention is easy to use, it is only necessary to increase test at the output common mode voltage setting end pin VOCM of Differential OPAMP
Signal, test signal behavior is flexible, can uninterrupted self-test, as a result calculating ratio does not need to occupy too many micro- place to very simple yet
Manage device resource.
In order to explain the structural features and functions of the invention more clearly, come with reference to the accompanying drawing with specific embodiment to this hair
It is bright to be described in detail.
Detailed description of the invention
Fig. 1 is the principle schematic diagram of the preferred embodiments of the invention；
Fig. 2 is the input/output relation figure of Differential OPAMP in the preferred embodiments of the invention.
Description of drawing identification:
10, standard self-test signal source 20, Differential OPAMP
30, microprocessor.
Specific embodiment
It please refers to shown in Fig. 1 and Fig. 2, that show a kind of data with self-checking function of the preferred embodiments of the invention to adopt
The specific structure of storage, including standard self-test signal source 10, Differential OPAMP 20, analog switch K1 and analog switch K2.
The standard self-test signal source 10 is for providing standard self-test signal；The standard that standard self-test signal source 10 provides
Self-test signal is direct current signal or AC signal.
The Differential OPAMP 20 is used in simulation input front end, is used as addition/subtraction device, for input signal and standard self-test
The signed magnitude arithmetic(al) of signal Vb, Differential OPAMP export V1=Vb+Vc-Va, V2=Vb+Va-Vc, obtain V1+V2=2Vb, and V1-V2=
2(Vc-Va).In the present embodiment, the V1 and V2 signal pass through micro process after back end signal pre-processes and ADC is acquired
Device 30 calculates V1+V2=2Vb, and V1-V2=2 (Vc-Va) obtains useful signal Vc-Va and standard self-test signal Vb.
Analog switch K1 and analog switch K2 is terminated into standard self-test signal and is connect for the VOCM of Differential OPAMP 20
The switching for entering Horizon signal, when accessing standard self-test signal, analog switch K1 is disconnected, analog switch K2 closure, when access ground
When ordinary mail, analog switch K2 is disconnected, analog switch K1 closure, when verifying input common-mode signal is 0V, is acquired and is calculated
Common-mode signal is compared with 0V.Under the Grounding of the end VOCM, standard self-test signal source 10 can be placed in dormant state, save function
Consumption；It is 0 that the end VOCM ground connection, which is equivalent to Vb signal potential, and the common-mode signal obtained by signed magnitude arithmetic(al) and 0 electric potential signal compare,
Preliminary judgement can be done to malfunction.
The invention also discloses the method that a kind of On-line self-diagnosis of the data collector of aforementioned strip self-checking function is surveyed, features
It is: includes following steps:
(1) microprocessor 30 controls analog switch K1 closure, and analog switch K2 is disconnected, at this time Vb=0V, and Differential OPAMP 20 exports
V1=Vb+Vc-Va, V2=Vb+Va-Vc.
(2) signal V1 and V2 pre-processes circuit by rear end, and the collected signal of ADC is respectively V1=Vb+Vc-Va, and V2=
Vb+Va-Vc。
(3) microprocessor 30 calculate acquisition signal amplitude be V1-V2=2 (Vc-Va), differential input signal be Vc-Va=
(V1-V2)/2。
(4) microprocessor 30 calculates V1+V2=2Vb, i.e. Vb=(V1+V2)/2, the Vb value being calculated is compared with 0V, altogether
In the case that mould input voltage is 0V, tentatively judge whether in the ideal situation to acquire access；
(5) microprocessor 30 control analog switch K2 closure, analog switch K1 disconnect, standard self-test signal be Vce, at this time Vb=
Vce, Differential OPAMP export V1=Vb+Vc-Va, V2=Vb+Va-Vc.
(6) it is calculated separately according to step (2), (3), (4) and show that differential input signal is Vc-Va=(V1-V2)/2, common mode letter
Number Vb=(V1+V2)/2, the Vb being calculated compared with standard self-test signal Vce whether within the scope of setting fault threshold, thus
Whether in the ideal situation to judge signal input channel, shows that analog channel is under malfunction beyond threshold value, microprocessor
Issue fault warning.
Design focal point of the invention is: circuit of the present invention is easy to use, it is only necessary in the output common mode of Differential OPAMP
Voltage set the end pin VOCM increase standard self-test signal, standard self-test signal selection flexibly, can uninterrupted self-test, as a result count
It calculates and compares also very simply, do not need to occupy too many microprocessor resources.
The above described is only a preferred embodiment of the present invention, be not intended to limit the scope of the present invention,
Therefore any subtle modifications, equivalent variations and modifications to the above embodiments according to the technical essence of the invention, still
Belong in the range of technical solution of the present invention.
Claims (4)
1. a kind of data collector with self-checking function, it is characterised in that: including standard self-test signal source, Differential OPAMP, mould
Quasi- switch K1 and analog switch K2；The standard self-test signal source is for providing standard self-test signal；The Differential OPAMP is used in
Simulation input front end is used as addition/subtraction device, transports for the addition and subtraction of differential input signal Va, Vc and standard self-test signal Vb
It calculates, Differential OPAMP exports V1=Vb+Vc-Va, V2=Vb+Va-Vc, obtains V1+V2=2Vb, V1-V2=2 (Vc-Va)；The simulation
Switch K1 and analog switch K2 terminates the switching into standard self-test signal and access Horizon signal for the VOCM of Differential OPAMP,
When accessing standard self-test signal, analog switch K1 is disconnected, analog switch K2 closure, when accessing Horizon signal, analog switch
K2 is disconnected, analog switch K1 closure, when verifying input common-mode signal is 0V, acquires the common-mode signal being calculated compared with 0V,
Tentatively judge whether in the ideal situation to acquire access.
2. the data collector according to claim 1 with self-checking function, it is characterised in that: standard self-test signal source
The standard self-test signal of offer is direct current signal or AC signal.
3. the data collector according to claim 1 with self-checking function, it is characterised in that: the V1 and V2 signal pass through
After back end signal pretreatment and ADC acquisition, V1+V2=2Vb is calculated by microprocessor, V1-V2=2 (Vc-Va) obtains useful letter
Number Vc-Va and standard self-test signal Vb.
4. a kind of method that the On-line self-diagnosis of the data collector as described in any one of claims 1-3 with self-checking function is surveyed,
It is characterized by comprising have following steps:
(1) microprocessor control analog switch K1 closure, analog switch K2 are disconnected, at this time Vb=0V, and Differential OPAMP output V1=
Vb+Vc-Va, V2=Vb+Va-Vc；
(2) signal V1 and V2 pre-processes circuit by rear end, and the collected signal of ADC is respectively V1=Vb+Vc-Va, V2=Vb+
Va-Vc；
(3) it is V1-V2=2 (Vc-Va) that microprocessor, which calculates the amplitude of acquisition signal, and differential input signal is Vc-Va=(V1-
V2)/2；
(4) microprocessor calculates V1+V2=2Vb, i.e. Vb=(V1+V2)/2, and the Vb value being calculated inputs compared with 0V in common mode
In the case that voltage is 0V, tentatively judge whether in the ideal situation to acquire access；
(5) microprocessor control analog switch K2 closure, analog switch K1 disconnect, standard self-test signal be Vce, at this time Vb=
Vce, Differential OPAMP export V1=Vb+Vc-Va, V2=Vb+Va-Vc；
(6) calculated separately according to step (2), (3), (4) obtain differential input signal be Vc-Va=(V1-V2)/2, common-mode signal Vb=
(V1+V2)/2 whether the Vb, being calculated is setting within the scope of fault threshold compared with standard self-test signal Vce, to judge
Whether in the ideal situation, beyond threshold value signal input channel shows that analog channel is under malfunction, and microprocessor issues
Fault warning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811001938.XA CN109191825A (en) | 2018-08-30 | 2018-08-30 | The method that data collector with self-checking function and its On-line self-diagnosis are surveyed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811001938.XA CN109191825A (en) | 2018-08-30 | 2018-08-30 | The method that data collector with self-checking function and its On-line self-diagnosis are surveyed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109191825A true CN109191825A (en) | 2019-01-11 |
Family
ID=64917190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811001938.XA Pending CN109191825A (en) | 2018-08-30 | 2018-08-30 | The method that data collector with self-checking function and its On-line self-diagnosis are surveyed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109191825A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111190047A (en) * | 2019-10-11 | 2020-05-22 | 浙江中控技术股份有限公司 | Current acquisition diagnosis circuit and failure diagnosis method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201955428U (en) * | 2011-01-27 | 2011-08-31 | 李恺 | Intelligent indoor mains electricity line fault diagnosis instrument |
| CN102624337A (en) * | 2012-03-29 | 2012-08-01 | 天津大学 | 2-fold switched capacitor amplifier insensitive to capacitor mismatch and sampling signal common mode |
| US20120235666A1 (en) * | 2008-06-18 | 2012-09-20 | Hioki Denki Kabushiki Kaisha | Voltage detecting apparatus and line voltage detecting apparatus |
| CN105277824A (en) * | 2015-10-10 | 2016-01-27 | 陕西千山航空电子有限责任公司 | Online automatic testing circuit and method of multichannel collection interface |
| CN107773240A (en) * | 2016-08-24 | 2018-03-09 | 四川锦江电子科技有限公司 | A kind of excitation source circuit based on Differential OPAMP |
| CN108023557A (en) * | 2017-12-06 | 2018-05-11 | 电子科技大学 | A kind of switched-capacitor CMFB structure |
-
2018
- 2018-08-30 CN CN201811001938.XA patent/CN109191825A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120235666A1 (en) * | 2008-06-18 | 2012-09-20 | Hioki Denki Kabushiki Kaisha | Voltage detecting apparatus and line voltage detecting apparatus |
| CN201955428U (en) * | 2011-01-27 | 2011-08-31 | 李恺 | Intelligent indoor mains electricity line fault diagnosis instrument |
| CN102624337A (en) * | 2012-03-29 | 2012-08-01 | 天津大学 | 2-fold switched capacitor amplifier insensitive to capacitor mismatch and sampling signal common mode |
| CN105277824A (en) * | 2015-10-10 | 2016-01-27 | 陕西千山航空电子有限责任公司 | Online automatic testing circuit and method of multichannel collection interface |
| CN107773240A (en) * | 2016-08-24 | 2018-03-09 | 四川锦江电子科技有限公司 | A kind of excitation source circuit based on Differential OPAMP |
| CN108023557A (en) * | 2017-12-06 | 2018-05-11 | 电子科技大学 | A kind of switched-capacitor CMFB structure |
Non-Patent Citations (2)
| Title |
|---|
| JAMES KARKI等: "在高速数据采集系统中采用全差分放大器设计", 《电子产品世界》 * |
| LEEJIAC: "全差分运算放大器ADA4930的分析(1)-leejiac-博客园", 《百度》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111190047A (en) * | 2019-10-11 | 2020-05-22 | 浙江中控技术股份有限公司 | Current acquisition diagnosis circuit and failure diagnosis method thereof |
| CN111190047B (en) * | 2019-10-11 | 2022-03-25 | 浙江中控技术股份有限公司 | Current acquisition diagnosis circuit and failure diagnosis method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103743944B (en) | A kind of real effective combined-voltage measuring method of automatic identification signal type | |
| CN206020619U (en) | A kind of portable relay tester | |
| CN206387898U (en) | A kind of DC voltage transformer transient response checked for characteristics device | |
| CN103616551B (en) | The terminal and cell voltage acquisition methods of cell voltage can be accurately obtained when charging | |
| CN205049678U (en) | Short circuit testing arrangement is opened to camera module | |
| CN203275483U (en) | Automatic amplitude modulation oscilloscope | |
| CN105651416A (en) | Current type temperature sensor circuit | |
| CN106909137B (en) | A kind of high diagnosis coverage rate analog quantity isolation distributor | |
| CN109191825A (en) | The method that data collector with self-checking function and its On-line self-diagnosis are surveyed | |
| CN110456141A (en) | A kind of flash over-current detection circuit and its method | |
| CN204028346U (en) | A kind of electric energy meter Auto-Test System | |
| CN206805286U (en) | A kind of device of DCS system simulations amount signal acquisition browsing real-time data | |
| CN203772944U (en) | True effective value AC/DC voltage measuring device capable of automatically identifying type of signal | |
| CN102710248A (en) | Isolated voltage acquisition circuit | |
| CN107707276B (en) | Power consumption detection device based on broadband power line carrier communication unit | |
| CN107064653A (en) | The comprehensive measuring method of pwm signal in alternating-current charging pile tester | |
| CN202285098U (en) | Advanced RISC machine (ARM)-technology-based visual aeronautical multi-bus monitoring tester | |
| CN205691645U (en) | A kind of signal detection system | |
| CN213275769U (en) | Novel low-voltage loop resistance tester | |
| CN206223992U (en) | Realize that gps antenna detects circuit based on ADC pressure differential methods | |
| CN204302445U (en) | A kind of rectifying device testing arrangement reverse recovery time | |
| CN208255308U (en) | A kind of double-range power consumption test circuit of pacemaker | |
| CN203299258U (en) | Application circuit for detecting positive and negative voltages by utilizing high-linearity analog photocoupler | |
| CN206270408U (en) | A kind of single-phase power factor detects circuit | |
| CN106019062B (en) | A kind of residual current coil breakage detection device and its detection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190111 |