CN100351749C - Digital signal acquiring circuit - Google Patents
Digital signal acquiring circuit Download PDFInfo
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- CN100351749C CN100351749C CNB2005100343430A CN200510034343A CN100351749C CN 100351749 C CN100351749 C CN 100351749C CN B2005100343430 A CNB2005100343430 A CN B2005100343430A CN 200510034343 A CN200510034343 A CN 200510034343A CN 100351749 C CN100351749 C CN 100351749C
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Abstract
The present invention relates to a digital signal collecting circuit which aims to solve the problem that the existing collecting circuit in the same type can only collect passive jamming signals. The digital signal collecting circuit of the present invention comprises a first input end and a second input end which are connected with a collected switch, and a power supply, wherein the voltage of the first pole of the power supply is higher than the voltage of the second pole thereof, and a first change-over switch is connected between the first input end and the first pole of the power supply, wherein the first input end can directly output collecting result signals through a first current-limiting resistor (R24) and can also output collecting result signals after being insulated by a photoelectric coupler, and the second input end can be directly connected with the second pole of the power supply and can also be connected with the second pole of the power supply through a second change-over switch. When the first pole of the power supply is a positive power supply, the second pole is connected with the ground; when the first pole is connected with the ground, the second pole is a negative power supply. The signals of a passive switch and an active switch can be respectively collected by setting different states for the first change-over switch and the second change-over switch.
Description
Technical field
The present invention relates to a kind of signal acquisition circuit, more particularly, relate to and a kind ofly can gather passive dry contact switching value signal, can gather the digital signal acquiring circuit of active switch amount level signal again.
Background technology
With regard to the acquisition technique of digital signal, digital signal acquiring circuit commonly used in the prior art only can be used to gather passive dry contact signal, be the passive dry contact power supply of on the slave unit needs being gathered, make that the signal condition of input isolation photoelectrical coupler is relevant with the duty of dry contact.Its typical circuit as shown in Figure 1, wherein, when the dry contact (not drawing in the drawings) that is connected with connector J7 is closed, + 24V voltage is connected to the dry contact that needs collection through the 1st pin of connector J7, again through the 2nd pin and the resistance R 14 of connector J7, be added on the light emitting diode among the photoelectrical coupler U74, make this light emitting diode conduction luminous, thereby make photoelectrical coupler U74 be in conducting state; When the dry contact that is connected with connector J7 disconnected ,+24V voltage can't be added on the light emitting diode in the photoelectrical coupler, and this moment, photoelectrical coupler was in off-state.That is to say that the conducting of photoelectrical coupler is corresponding to the closure of dry contact, the disconnection of photoelectrical coupler then corresponding to the disconnection of dry contact, by the differentiation to this two states, can realize the collection to passive dry contact signal (closure/disconnection).Voltage stabilizing diode DA74 among the figure plays the voltage-stabilizing protection effect to the light emitting diode in the photoelectrical coupler.The major defect that sort circuit exists is: can't gather active switch amount level signal, only can be used to gather passive dry contact signal.
Summary of the invention
The present invention will solve existing digital signal acquiring circuit and can't gather active switch amount level signal, only can be used to gather the problem of passive dry contact signal.
For solving the problems of the technologies described above, the invention provides a kind of digital signal acquiring circuit, comprise and gathered first, second input end that switch is connected, also comprise a power supply and first change-over switch; The voltage of first utmost point of described power supply is higher than the voltage of second utmost point; Described first change-over switch is connected between first utmost point and first input end of described power supply; Described second input end is connected with second utmost point of described power supply; The described first input end also positive pole of the light emitting diode in the input extremely of first current-limiting resistance and a photoelectrical coupler is connected, and described second input end also is connected with the negative pole of described light emitting diode; The output stage of described photoelectrical coupler is exported corresponding signal as the collection result signal according to the whether luminous of described light emitting diode.
In a preferred embodiment of the present invention, all right: as between second utmost point of described second input end and described power supply, to connect one second change-over switch; Between the negative pole of described second input end and described light emitting diode, be connected in series one second current-limiting resistance; And between the positive pole of described light emitting diode and second input end, oppositely be connected a voltage stabilizing diode.Wherein, described first, second change-over switch is preferably the linked switch that can be simultaneously closed or disconnects.
Among the present invention, if first positive supply very of described power supply, for example+24V, then second very; If described power supply first very, second negative supply very then, for example-24V.In addition, also can between first utmost point of described power supply and first change-over switch, be connected in series one the 3rd current-limiting resistance.
Among the present invention, also can set up a connector, be connected described the collection between switch and described first, second input end; Described gathered switch outputed to described first, second input end by acquired signal by described connector.
Among the present invention, described first change-over switch can be toggle switch, multiway analog switch or relay.
By such scheme as can be known; the present invention is by setting up change-over switch in traditional circuit; and state is set by the difference of change-over switch; can realize collection, wherein also use current-limiting resistance and voltage stabilizing diode etc. that active switch amount level signal is with protection passive dry contact switching value signal and active switch amount signal.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the synoptic diagram of a typical digital signal acquiring circuit of the prior art;
Fig. 2 is the synoptic diagram of the digital signal acquiring circuit in a preferred embodiment of the invention;
Fig. 3 is the synoptic diagram of the digital signal acquiring circuit in the another preferred embodiment of the present invention.
Embodiment
By the description of front as can be known, the objective of the invention is to design and a kind ofly can gather passive dry contact switching value signal, can gather the circuit of active switch amount level signal again.
A preferred embodiment of the present invention as shown in Figure 3, wherein, two change-over switches are arranged in SW7, first end of first change-over switch is connected with+24V voltage, first end of second change-over switch is connected with ground, and second end of two switches is connected with first, second input end of whole Acquisition Circuit respectively.
When two change-over switches among the SW7 are in full ON (promptly closed), can be used for gathering passive dry contact switching value signal, promptly be connected with passive dry contact by connector J10; At this moment, if the dry contact signal closes that is connected with connector J10, + 24V voltage is ground connection after resistance R 47, first change-over switch, connector J10, second change-over switch, that is to say, no-voltage on the light emitting diode among this moment photoelectrical coupler U15, photoelectrical coupler is in off-state, and the output stage of photoelectrical coupler does not have output signal; If the dry contact signal that is connected with connector J10 disconnects, then+24V voltage is on resistance R 47, R24 are added in light emitting diode in the photoelectrical coupler, make photoelectrical coupler be in conducting state, this moment, the output stage of photoelectrical coupler had output signal, can realize the isolation collection to the dry contact signal thus.
When change-over switch SW7 is in full OFF (disconnection), can be used for gathering active switch amount level signal, promptly be connected with active switch by connector J10.At this moment, when the level signal by connector J10 input is lower than a certain lower limit threshold values, the brownout at the light emitting diode two ends among the photoelectrical coupler U15, photoelectrical coupler is in off-state; When the level signal by J10 input is higher than a certain upper limit threshold values, the lumination of light emitting diode in the photoelectrical coupler, photoelectrical coupler is in conducting state.Can realize isolation collection thus to active switch amount level signal.
At different active switch amount level signals, can select corresponding current-limiting resistance R23, R24, voltage stabilizing diode D9 and photoelectrical coupler U15.For circuit as shown in Figure 3, its incoming level signal can be 0～1V, 5V～26V two states, the conduction voltage drop of the light emitting diode among the wherein selected photoelectrical coupler U15 is 1.2V, the voltage stabilizing value of voltage stabilizing diode D9 then is 2.4V, current-limiting resistance R23 is 560 ohm, and R24 is 1K ohm.When the incoming level signal was 0～1V, the light emitting diode in the photoelectrical coupler was can't conducting luminous, and photoelectrical coupler is in off-state; When the incoming level signal is 5V～26V, light emitting diode conducting in the photoelectrical coupler is luminous, photoelectrical coupler is in conducting state, resistance is that the voltage stabilizing diode that 560 ohm current-limiting resistance R23 and voltage stabilizing value are 2.4V can guarantee that the input current of light emitting diode in the photoelectrical coupler can be not excessive, to satisfy the wide region requirement of 5V～26V.
By top description as can be known; in the present embodiment; difference by two change-over switches is provided with state, has realized the isolation collection to passive dry contact switching value signal and active switch amount signal, and uses current-limiting resistance and voltage stabilizing diode etc. that active switch amount level signal is with protection.During concrete enforcement, switch SW 7 wherein can adopt toggle switch, multiway analog switch, relay etc.When adopting multiway analog switch, can control it by software, with type on off state is provided with according to input signal; When using toggle switch, then need manually to be provided with according to input signal types.Capacitor C 27 among Fig. 3, C28 and bi-directional voltage stabilizing diode D33, D34 are used to play the lightning protection effect.
During concrete enforcement, if what used in the slowdown monitoring switch is negative supply, then also can correspondingly adopt negative supply to come work, for example original+24V positive supply be changed into ground GND, ground GND originally then changes negative supply-24V into.In addition, can also save second change-over switch wherein and only keep first change-over switch, just allow the direct ground connection of second input end among Fig. 3, should delete capacitor C 27 and bi-directional voltage stabilizing diode D33 wherein this moment.
An embodiment who more simplifies of the present invention does not wherein have photoelectrical coupler as shown in Figure 2, so be directly to gather rather than the isolation collection.Wherein be provided with a connector J10, the signal of being gathered can be introduced from this connector J10; The first input end of this Acquisition Circuit is connected with+24V power supply through change-over switch K3, current-limiting resistance R47, and through another current-limiting resistance R24 output collection result signal; The then direct ground connection of second input end of Acquisition Circuit.Capacitor C 28 wherein and bi-directional voltage stabilizing utmost point pipe D34 are used to play the lightning protection effect.
In the present embodiment, when K switch 3 closures, the top pin of connector J10 connects+24V, and bottom pin ground connection can be used for detecting the passive switch signal: at this moment, if the dry contact signal closes that is connected with connector J10, then output signal is a low level; If the dry contact signal that is connected with connector J10 disconnects, then output signal is a high level.When K switch 3 disconnected ,+24V power supply was disconnected, and crus secunda is ground connection still, can be used for detecting the active switch signal this moment, its prerequisite be external active switching signal and inside altogether.
Claims (8)
1, a kind of digital signal acquiring circuit comprises and quilt is gathered first, second input end that switch is connected, and it is characterized in that: also comprise a power supply and first change-over switch; The voltage of first utmost point of described power supply is higher than the voltage of second utmost point; Described first change-over switch is connected between first utmost point and first input end of described power supply; Described second input end is connected with second utmost point of described power supply;
The described first input end also positive pole of the light emitting diode in the input extremely of first current-limiting resistance (R24) and a photoelectrical coupler is connected, and described second input end also is connected with the negative pole of described light emitting diode;
The output stage of described photoelectrical coupler is exported corresponding signal as the collection result signal according to the whether luminous of described light emitting diode.
2, digital signal acquiring circuit according to claim 1 is characterized in that, described second input end is connected with second utmost point of described power supply through one second change-over switch.
3, digital signal acquiring circuit according to claim 2 is characterized in that, also is serially connected with second current-limiting resistance (R23) between the negative pole of described second input end and described light emitting diode.
4, digital signal acquiring circuit according to claim 3 is characterized in that, also oppositely is connected with a voltage stabilizing diode (D9) between the positive pole of described light emitting diode and second input end.
5, digital signal acquiring circuit according to claim 2 is characterized in that, described first, second change-over switch is a linked switch closed simultaneously or that disconnect.
6, according to each described digital signal acquiring circuit among the claim 1-5, it is characterized in that, wherein:
First positive supply very of described power supply, second very; Perhaps, described power supply first very, second negative supply very;
Between first utmost point of described power supply and first change-over switch, also be serially connected with the 3rd current-limiting resistance (R47).
7, according to each described digital signal acquiring circuit among the claim 1-5, it is characterized in that, also comprise a connector, be connected described the collection between switch and described first, second input end; Described gathered switch outputed to described first, second input end by acquired signal by described connector.
According to each described digital signal acquiring circuit among the claim 1-5, it is characterized in that 8, described first change-over switch is toggle switch, multiway analog switch or relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100343430A CN100351749C (en) | 2005-04-21 | 2005-04-21 | Digital signal acquiring circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100343430A CN100351749C (en) | 2005-04-21 | 2005-04-21 | Digital signal acquiring circuit |
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| CN1719386A CN1719386A (en) | 2006-01-11 |
| CN100351749C true CN100351749C (en) | 2007-11-28 |
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| CNB2005100343430A Expired - Fee Related CN100351749C (en) | 2005-04-21 | 2005-04-21 | Digital signal acquiring circuit |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102346478B (en) * | 2011-09-08 | 2013-04-03 | 重庆长安汽车股份有限公司 | Circuit and method for detecting failures in data acquisition of overall controller of automobile |
| CN106773885B (en) * | 2015-11-24 | 2019-06-21 | 中车大连电力牵引研发中心有限公司 | Digital acquisition circuit and system |
| CN106253903B (en) * | 2016-07-29 | 2019-08-16 | 中车大连电力牵引研发中心有限公司 | Digital quantity acquiring circuit |
| CN106125618B (en) * | 2016-07-29 | 2019-01-08 | 中车大连电力牵引研发中心有限公司 | Digital signal acquiring circuit, digital signal acquiring board |
| CN108983696A (en) * | 2018-09-06 | 2018-12-11 | 北京优航机电技术有限公司 | A kind of online switching detection method of PLC different type digital quantity signal and device |
| CN109406998A (en) * | 2018-12-11 | 2019-03-01 | 株洲田龙铁道电气股份有限公司 | A kind of test device and test method of nonpolarity stem grafting dot circuit |
| CN112783042B (en) * | 2020-12-31 | 2023-02-03 | 瑞斯康达科技发展股份有限公司 | Signal acquisition circuit and acquisition method |
| CN113687224B (en) * | 2021-09-18 | 2024-02-02 | 杭州和利时自动化有限公司 | Switch signal acquisition system and switch signal acquisition equipment thereof |
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| JPH08159817A (en) * | 1994-12-02 | 1996-06-21 | Matsushita Electric Ind Co Ltd | Small type data collection device |
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| CN2625907Y (en) * | 2003-05-26 | 2004-07-14 | 沈建 | A pulse data aquisition unit |
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| CN2676218Y (en) * | 2003-08-22 | 2005-02-02 | 株洲时代电子技术有限公司 | Device for testing digital circuit |
| CN1584815A (en) * | 2004-05-24 | 2005-02-23 | 武汉大学 | Multi-channel data collecting method and apparatus |
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2005
- 2005-04-21 CN CNB2005100343430A patent/CN100351749C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2209335Y (en) * | 1994-10-08 | 1995-10-04 | 深圳深锋电子仪器有限公司 | Full-automatic digital multitester |
| JPH08159817A (en) * | 1994-12-02 | 1996-06-21 | Matsushita Electric Ind Co Ltd | Small type data collection device |
| US20020140523A1 (en) * | 2001-03-28 | 2002-10-03 | Edwin Park | Signal filter with adjustable analog impedance selected by digital control |
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| CN1719386A (en) | 2006-01-11 |
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Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518055 No. 1001 Nanshan Chi Park B2 building 1-4 floor, building 6-10 Patentee after: VERTIV TECH Co.,Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: EMERSON NETWORK POWER Co.,Ltd. |
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Effective date of registration: 20191121 Address after: 363200, Zhangzhou, Fujian province Zhangpu County Industrial Development Zone, Sui An Industrial Park Patentee after: ZHANGPU BISU PHOTOELECTRIC TECHNOLOGY Co.,Ltd. Address before: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518055 No. 1001 Nanshan Chi Park B2 building 1-4 floor, building 6-10 Patentee before: VERTIV TECH Co.,Ltd. |
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Effective date of registration: 20201013 Address after: 277100 3rd floor, B2 building, 2666 Changbaishan Road, high tech Zone, Zaozhuang City, Shandong Province Patentee after: Shandong Lunan big data industry development Co.,Ltd. Address before: 363200, Zhangzhou, Fujian province Zhangpu County Industrial Development Zone, Sui An Industrial Park Patentee before: ZHANGPU BISU PHOTOELECTRIC TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20071128 |