CN100371960C - Signal Collecting device - Google Patents
Signal Collecting device Download PDFInfo
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- CN100371960C CN100371960C CNB2005101233207A CN200510123320A CN100371960C CN 100371960 C CN100371960 C CN 100371960C CN B2005101233207 A CNB2005101233207 A CN B2005101233207A CN 200510123320 A CN200510123320 A CN 200510123320A CN 100371960 C CN100371960 C CN 100371960C
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Abstract
The present invention relates to a signal collecting device which comprises a signal collecting unit, a power supply, a first port used for inputting voltage signals or resistance signals, a second port used for inputting current signals or resistance signals, a third port used for inputting voltage signals, or current signals or resistance signals, a first switch, a second switch, a third switch and a switch controller for controlling the on-off state of each switch, wherein the first port, the second port and the third port are connected to the signal collecting unit respectively through the first switch, the second switch and the third switch; the first port and the third port are respectively connected to both ends of the power supply through a fourth switch and a fifth switch. The signal collecting device can be used for collecting the voltage signals, or the current signals or the resistance signals in a selective way by using the switch controller to control the switches to be in different on-ff states. The signal collecting device of the present invention not only performs the function of signal isolation, but is also capable of automatically setting signal types. The signal collecting device can be applied to instruments and meters with the need of collecting industrial signals.
Description
Technical field
The present invention relates to industrial instrumentation instrument field, relate in particular to a kind of signal pickup assembly, particularly overcome interference, and can select wherein a kind of signal pickup assembly of signal in voltage, electric current, these three kinds of industrial signals of three-wire system resistance arbitrarily relevant for the employing isolation technology.
Background technology
In order to obtain the various signals of industry spot, as signals such as temperature, pressure, flow, digital quantity, pulsed quantity, voltage, electric currents, the harvester of various models and type emerges in an endless stream.Signal pickup assembly commonly used is to be used for gathering in these three kinds of industrial signals of voltage, electric current and three-wire system resistance one of them, and the signal that collects is input to various controllers or output unit, so that adapt to the various application of industry spot.
Because the interference that industry spot produces various signals, therefore above-mentioned signal pickup assembly not only needs acquired signal, but also need overcome the signal interference that industry spot produces.At present, signal pickup assembly adopts isolation technology to improve the common mode inhibition capacity of device usually, and then improves the antijamming capability of harvester.The Signal Isolation Technology that exists has a variety of, and technology such as isolation, switch isolation and mixed method isolation fly over as photoelectricity isolation, electromagnetic isolation, electric capacity.Wherein, switch isolation is the fairly simple technology that can reach the Signal Spacing purpose.Switch isolation can adopt mechanical switch, as tongue tube, mercury relay etc., also can adopt electronic switch, as photoelectricity coupling MOS (metal-oxide semiconductor (MOS)) switch etc.Because the break-make life-span of mechanical switch is low, switching speed is slow, and usable range is very limited, so adopt electronic switch more suitable.That is, signal pickup assembly selects photoelectric coupling switch to realize Signal Spacing usually.
Signal pickup assembly with Signal Spacing function can adopt manual set-up mode when signal is selected, also can adopt Automatic Styles.Wherein, the most convenient with the Automatic Styles of software control, more help on-the-spot application.But, the existing signal pickup assembly of a kind of signal wherein of selecting from voltage, electric current and three-wire system resistance is when selecting signal, many times need manual the setting, can't be provided with automatically by software fully, cause the signal pickup assembly can not some applications of fine adaptation thus.
That is, there is following problem in existing signal pickup assembly with Signal Spacing function:
(1) when needs is gathered current signal, the access of resistance is by hand switch or wire jumper control, or employing external impressed current/voltage transitions resistance, these operations must be finished by manual, can't be provided with automatically by software, and the space of industry spot is limited, and manual operations all can cause the use inconvenience of signal pickup assembly to may damaging of installing;
(2) when needs are imported different signals, need to change the position of signal input part, and input end is more, has promptly increased cost, also increased the complexity of operation.
Summary of the invention
The object of the present invention is to provide a kind of signal pickup assembly, can't be provided with automatically by software fully to solve existing signals collecting, and then cause the not wield technical matters of signal pickup assembly with signal pickup assembly of Signal Spacing function.
For addressing the above problem, the invention discloses a kind of signal pickup assembly, comprise signal gathering unit and current source, also comprise: be used for first port of input voltage or resistance signal, second port that is used for input current or resistance signal, the 3rd port that is used for input voltage, electric current or resistance signal, first switch, second switch, the 3rd switch and control each switch on and off state of switch controller, wherein, first port, second port, the 3rd port are connected to described signal gathering unit by first switch, second switch, the 3rd switch respectively.
First port and the 3rd port are connected to the two ends of current source respectively by the 4th switch, the 5th switch.
Also being provided with one between second port and the 3rd port, to be used for current conversion be first resistance of voltage.
Described first switch, second switch, the 3rd switch, the 4th switch and the 5th switch are photoelectricity coupling MOS switch.Photoelectricity coupling MOS switch has light emitting diode and photosensitive metal-oxide-semiconductor, and on-off controller makes photosensitive metal-oxide-semiconductor open or disconnect by the electric current that changes light emitting diode.
The present invention also comprises: first port and the 3rd port are connected to the two ends of current source respectively by first switch, the 3rd switch
Compared with prior art, the present invention has the following advantages: when on-off controller made that all switches are in off state, the passage between each port and the signal gathering unit was cut off, and played the Signal Spacing effect.And signal pickup assembly is controlled each switch by on-off controller and is in different closure states, can select to gather voltage, electric current or resistance signal, thereby realizes the automatic setting of signal kinds.Above-mentioned signal pickup assembly can be applied in the instrument and meter that needs industrial signals collecting.
The present invention adopts built-in fixed resistance mode to realize the conversion of current/voltage, avoids the inconvenience of external resistance in structure and use; And the present invention is simple in structure, does not have parts such as manual wire jumper that is provided with of any needs and switch, in conjunction with photoelectricity coupling MOS switch and on-off controller, thereby can adopt software to realize the selection of signal, avoids the manual inconvenience that is provided with.In addition, the present invention adopts three input ports, makes port number reach minimum, has simplified the structure of signal pickup assembly, thereby has also saved a large amount of costs.
Description of drawings
Fig. 1 is the structural representation of signal pickup assembly of the present invention;
Fig. 2 is a signal pickup assembly external signal connection diagram of the present invention;
Fig. 3 is the structural representation of the signal pickup assembly of a kind of simplification of the present invention;
Fig. 4 is the structural representation of a kind of embodiment of signal pickup assembly of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specify the present invention.
See also Fig. 1, it is for a structural representation of signal pickup assembly of the present invention.Comprise: current source 20, signal gathering unit 10, first port (port A) 1 that is used for input voltage or resistance signal, second port (port B) 2 that is used for input current or resistance signal, be used for input voltage, the 3rd port of electric current or resistance signal (port C) 3, and the 4th switch (change-over switch A) 5 of connectivity port A1 and current source 20, first switch (change-over switch B) 6 of connectivity port A1 and signal gathering unit 10, the second switch of connectivity port B2 and signal gathering unit 10 (change-over switch C) 7, the 3rd switch (change-over switch D) 8 of connectivity port C3 and signal gathering unit 10, the 5th switch (change-over switch E) 9 of connectivity port C3 and current source 20 and the on-off controller 11 of controlling each change-over switch on off operating mode.
Described change-over switch A5, change-over switch B6, change-over switch C7, change-over switch D8, change-over switch E9 can also can be mechanical switch for electronic switch.But the break-make life-span of considering mechanical switch is low and switching speed is slow, and change-over switch A5, change-over switch B6, change-over switch C7, change-over switch D8, change-over switch E9 preferably adopt photoelectricity coupling MOS switch.Signal pickup assembly not only has wherein a kind of ability of signal of the voltage of collection, electric current and three-wire system resistance, and adopts photoelectricity coupling MOS switch to make it have isolation features, so that overcome the signal interference that industry spot produces.And photoelectricity coupling MOS switch has light emitting diode and photosensitive metal-oxide-semiconductor, and on-off controller 11 is by changing the electric current of light emitting diode, thereby makes photosensitive metal-oxide-semiconductor open or turn-off, and then the corresponding switch of control is opened or disconnected.Signal pickup assembly can be selected the on-off controller 11 of corresponding types according to adopting dissimilar switches.
Need outer meeting resistance to realize the conversion of electric current during for fear of the collection current signal to voltage, the present invention adopts built-in fixed resistance mode to realize the conversion of current/voltage, and promptly fixedly connected between port B2 and port C3 to be used for current conversion be first resistance 4 of voltage.
Below specify the principle of work of above-mentioned signal pickup assembly disclosed by the invention.
See also Fig. 2 (a), when external input signal is voltage signal, an end connectivity port A1 of signal, other end connectivity port C3.By on-off controller 11 output control signals, to control the led current of each change-over switch, thereby make change-over switch B6 and change-over switch D8 open-minded, other change-over switches are turn-offed.Voltage signal is finished the collection of voltage signal by change-over switch B6 and change-over switch D8 entering signal collecting unit 10.
See also Fig. 2 (b), when external input signal is current signal, an end connectivity port B2 of signal, other end connectivity port C3, current signal flow through first resistance 4 and convert voltage signal to.By on-off controller 11 output control signals, to control the led current of each change-over switch, thereby make change-over switch C7 and change-over switch D8 open-minded, other change-over switches are turn-offed.Voltage signal on first resistance 4 passes through change-over switch C7 and change-over switch D8 entering signal collecting unit 10, thereby obtains the voltage on first resistance 4, and then can calculate the acquisition current signal value
See also Fig. 2 (c), external input signal is three-wire system resistance signal Rt, and the resistance of its three leads is r.To the measurement of resistance R t, need to remove the influence of conductor resistance.One end connectivity port A1 of resistance, other end connectivity port B2, the 3rd end connectivity port C3.By on-off controller 11 output signals, control the led current of each change-over switch, thereby make that all change-over switches are open-minded.Current source 20 provides a constant electric current by change-over switch A5 and change-over switch E9, thereby produces certain voltage signal on the three-wire system resistance signal.Voltage signal is by change-over switch B6, change-over switch C7 and change-over switch D8, entering signal collecting unit 10, and by formula Rt=Vac/i-(2*i*R-Vbc) * Vbc/ (i*R-2*Vbc)/i, thereby the accurate resistance value of picked up signal resistance R t, and the influence of having removed conductor resistance.Wherein, i is the current value of current source 20 outputs, and R is the resistance of first resistance 4, and Vac is the voltage between port A1 and the port C3, and Vbc is the voltage between port B2 and the port C3, and Vac and Vbc obtain by signal gathering unit.
When switch B is identical or known with switch D resistance, can also above-mentioned signal pickup assembly be simplified.See also Fig. 3, it is the structural representation of second kind of signal pickup assembly disclosed by the invention.It comprises signal gathering unit 10, current source 20, first port (port A) 1 that is used for input voltage or resistance signal, second port (port B) 2 that is used for input current or resistance signal, be used for input voltage, the 3rd port of electric current or resistance signal (port C) 3, first switch (change-over switch B) 6, second switch (change-over switch C) 7, the 3rd switch (change-over switch D) 8 and control each switch on and off state of switch controller 11, wherein, port A1, port B2, port C3 is respectively by change-over switch B6, change-over switch C7, change-over switch D8 is connected to signal gathering unit 11, the two ends of current source 20 are connected to port A1 and port C3 by change-over switch B6 and change-over switch D8 respectively, thereby have reduced the use of change-over switch.
All comprise signal gathering unit 10 in above-mentioned two kinds of signal pickup assemblies.Signal gathering unit 10 can be made up of operational amplifier, analog/digital converter and microprocessor, wherein operational amplifier is done impedance transformation and gain adjustment, analog/digital converter is converted to digital signal with voltage signal, and input microprocessor, finish calculating and control function by microprocessor.And microprocessor can also be connected with on-off controller 11, and the control signal of on-off controller 11 outputs is controlled by the microprocessor of signal gathering unit 10, thereby accomplishes the purpose that signal pickup assembly is controlled by microprocessor fully.Signal gathering unit can adopt the MCS1210 of TI company or the integrated circuit such as ADuC834 of AD company.
There is not the access that utilizes hand switch or wire jumper controlling resistance in above-mentioned signal pickup assembly disclosed by the invention simple in structure, avoids the manual inconvenience that is provided with.
Below just signal isolating device of the present invention is described with a specific embodiment.
See also Fig. 4, it is for a structural representation of signal isolating device of the present invention.Comprise: the port A1 that is used for input voltage or resistance signal, the port B2 that is used for input current or resistance signal, be used for input voltage, the port C3 of electric current or resistance signal, an and end connectivity port A1, the other end connects the change-over switch A5 of resistance B21 and JFET22 grid, one end connectivity port A1, the other end connects the change-over switch B6 of signal gathering unit 10, one end connectivity port B2, the other end connects the change-over switch C7 of signal gathering unit 10, one end connectivity port C3, the other end connects the change-over switch D8 of signal gathering unit 10, one end connectivity port C3, the other end connects the change-over switch E9 on power supply ground 24, one end connects change-over switch A5 and JFET22 grid, the other end connects the resistance B21 of JFET22 drain electrode, and an end connects the end of resistance B21, the other end connects the other end of resistance B21, the 3rd end connects the junction field triode JFET22 of power supply VCC23.
Described change-over switch A5, change-over switch B6, change-over switch C7, change-over switch D8, change-over switch E9 are photoelectricity coupling MOS switch, and a kind of switch with light emitting diode and photosensitive metal-oxide-semiconductor element is as PANASONIC PHOTOMOS series optoelectronic switch product.
Described signal isolating device also comprises first resistance 4 that is connected between port B2 and the port C3, and being used for current conversion is voltage.
The principle of work of above-mentioned disclosed signal isolating device is simply introduced by following elder generation.
Resistance B21 and junction field triode JFET22 constitute a kind of constant current output unit, guarantee that the electric current that flows into change-over switch A5 is not subjected to voltage VCC23, and the influence of external signal variation, thereby obtain constant current i.
On-off controller 11 is made up of the logical drive device, and the output of its logic state can be controlled by the microprocessor of signal gathering unit 10, thereby when different signal inputs, the output control signal corresponding.
See also Fig. 2 (a), when external input signal is voltage signal, an end connectivity port A1 of signal, other end connectivity port C3.By on-off controller 11 output control signals, to control the led current of each change-over switch, thereby make change-over switch B6 and change-over switch D8 open-minded, other change-over switches are turn-offed.Voltage signal is finished the collection of voltage signal by change-over switch B6 and change-over switch D8 entering signal collecting unit 10.
See also Fig. 2 (b), when external input signal is current signal, an end connectivity port B2 of signal, other end connectivity port C3, current signal flow through first resistance 4 and convert voltage signal to.By on-off controller 11 output control signals, to control the led current of each change-over switch, thereby make change-over switch C7 and change-over switch D8 open-minded, other change-over switches are turn-offed.Voltage signal on first resistance 4 passes through change-over switch C7 and change-over switch D8 entering signal collecting unit 10, thereby obtains the voltage on first resistance 4, and then can calculate the acquisition current signal value.
See also Fig. 2 (c), external input signal is three-wire system resistance signal Rt, and the resistance of its three leads is r.To the measurement of resistance R t, need to remove the influence of conductor resistance.One end connectivity port A1 of resistance, other end connectivity port B2, the 3rd end connectivity port C3.By on-off controller 11 output signals, control the led current of each change-over switch, thereby make that all change-over switches are open-minded.The current source that resistance B21 and JFET22 constitute provides a constant electric current by change-over switch A5 and change-over switch E9 to resistance signal, thereby produces certain voltage signal on the three-wire system resistance signal.Voltage signal is by change-over switch B6, change-over switch C7 and change-over switch D8, entering signal collecting unit 10, and by formula Rt=Vac/i-(2*i*R-Vbc) * Vbc/ (i*R-2*Vbc)/i, thereby the accurate resistance value of picked up signal resistance R t, and the influence of having removed conductor resistance.Wherein, i is the current value of constant-current device output, and R is the resistance of first resistance 4, and Vac is the voltage between port A1 and the port C3, and Vbc is the voltage between port B2 and the port C3, and Vac and Vbc obtain by signal gathering unit.
Signal pickup assembly disclosed by the invention not only can be realized the Signal Spacing function, but also can realize by software one of them signal of selection from voltage, electric current and three-wire system resistance being set automatically.
More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop on protection scope of the present invention.
Claims (4)
1. signal pickup assembly, comprise signal gathering unit and current source, it is characterized in that, also comprise: first port that is used for input voltage or resistance signal, second port that is used for input current or resistance signal, be used for input voltage, the 3rd port of electric current or resistance signal, first switch, second switch, the 3rd switch and control each switch on and off state of switch controller, wherein, first port, second port, the 3rd port is respectively by first switch, second switch, the 3rd switch is connected to described signal gathering unit, described first port and the 3rd port are respectively by the 4th switch, the 5th switch is connected to the two ends of current source, and being provided with one between second port and the 3rd port, to be used for current conversion be first resistance of voltage.
2. signal pickup assembly as claimed in claim 1 is characterized in that, and is identical with the 3rd switch resistance or when being known, first port and the 3rd port are connected to the two ends of current source respectively by first switch, the 3rd switch when first switch.
3. signal pickup assembly as claimed in claim 2 is characterized in that, described first switch, second switch, the 3rd switch, the 4th switch and the 5th switch are photoelectricity coupling MOS switch.
4. signal pickup assembly as claimed in claim 3 is characterized in that, described photoelectricity coupling MOS switch has light emitting diode and photosensitive metal-oxide-semiconductor, and on-off controller makes photosensitive metal-oxide-semiconductor open or disconnect by the electric current that changes light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101233207A CN100371960C (en) | 2005-11-17 | 2005-11-17 | Signal Collecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101233207A CN100371960C (en) | 2005-11-17 | 2005-11-17 | Signal Collecting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1776761A CN1776761A (en) | 2006-05-24 |
| CN100371960C true CN100371960C (en) | 2008-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101233207A Expired - Fee Related CN100371960C (en) | 2005-11-17 | 2005-11-17 | Signal Collecting device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102421224B (en) * | 2011-09-05 | 2013-09-25 | 电子科技大学 | Self-feedback linear constant current device for driving LED (light-emitting diode) |
| CN104267640B (en) * | 2014-09-23 | 2017-09-01 | 中国北方车辆研究所 | A kind of general Acquisition Circuit of analog signal |
| CN104597348B (en) * | 2015-01-19 | 2017-09-12 | 浙江中控自动化仪表有限公司 | A kind of method and system for the input signal types for detecting omnipotent input |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87201296U (en) * | 1987-04-28 | 1988-02-03 | 张安钢 | Ac digital tong-type ammeter |
| DE4234789A1 (en) * | 1992-10-15 | 1994-04-21 | Metrawatt Gmbh | Digital multimeter |
| CN1655204A (en) * | 2005-03-08 | 2005-08-17 | 浙江浙大中控自动化仪表有限公司 | Signal output unit |
-
2005
- 2005-11-17 CN CNB2005101233207A patent/CN100371960C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87201296U (en) * | 1987-04-28 | 1988-02-03 | 张安钢 | Ac digital tong-type ammeter |
| DE4234789A1 (en) * | 1992-10-15 | 1994-04-21 | Metrawatt Gmbh | Digital multimeter |
| CN1655204A (en) * | 2005-03-08 | 2005-08-17 | 浙江浙大中控自动化仪表有限公司 | Signal output unit |
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| Publication number | Publication date |
|---|---|
| CN1776761A (en) | 2006-05-24 |
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