CN205451470U - Data communication interface device - Google Patents
Data communication interface device Download PDFInfo
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- CN205451470U CN205451470U CN201620260623.7U CN201620260623U CN205451470U CN 205451470 U CN205451470 U CN 205451470U CN 201620260623 U CN201620260623 U CN 201620260623U CN 205451470 U CN205451470 U CN 205451470U
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- voltage
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- current transducer
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Abstract
The utility model discloses a data communication interface device, including voltage -current conversion interface, voltage input circuit, current output circuit, control circuit, power supply circuit, the voltage -current conversion interface with voltage input circuit electricity is connected, the voltage -current conversion interface with the current output circuit electricity is connected, the voltage -current conversion interface with the control circuit electricity is connected, the voltage -current conversion interface still with the power supply circuit electricity is connected. The utility model discloses can convert voltage signal into current signal and carry out teletransmission, because the current signal is difficult to receive the interference, the internal resistance of electric current source is infinitely great, and wire series resistance does not influence the precision in the return circuit, can transmit hundreds of rice on ordinary paired line, and the current signal transmission mode can be widely applied in industrial field.
Description
Technical field
This utility model relates to a kind of data communication interface equipment.
Background technology
Remote collection data are widely used in the technical fields such as mobile data transfer field, such as automobile navigation monitor, intelligence exceeds standard.During the data that remote transmission collects, data communication interface is most important.At present, major part data communication interface can only export digital quantity, analog quantity.
But, in terms of some commercial Application, some sensor needs the electric current by data communication interface input 4～20mA.4～20mA direct current signal Zhi Shi International Electrotechnical Commissions: Process Control System analogue signal standard.In industry spot, if after the signal conditioned one-tenth voltage signal that will gather, Long line transmission being carried out, problems with can be produced: (one) is voltage signal due to the signal of transmission, and transmission line is easily just disturbed by noise；(2) distributed resistance of transmission line can produce pressure drop；(3) the inconvenient on-the-spot running voltage that instrument amplifier is provided.
Therefore, this area needs the data communication interface realizing having electric current output function badly.
Utility model content
The technical scheme that this utility model provides is as follows:
A kind of data communication interface equipment that this utility model provides, including Voltage to current transducer interface, voltage input circuit, current output circuit, control circuit, power circuit；Described Voltage to current transducer interface electrically connects with described voltage input circuit, described Voltage to current transducer interface electrically connects with described current output circuit, described Voltage to current transducer interface electrically connects with described control circuit, and described Voltage to current transducer interface also electrically connects with described power circuit.
Further, described Voltage to current transducer interface includes that Voltage to current transducer chip, described voltage input circuit include that the first resistance, described Voltage to current transducer chip connect input voltage by described first resistance.
Further, described voltage input circuit also includes diode, the anode of described diode is connected with the negative electricity of described power circuit, and the negative electrode of described diode is electrically connected with described Voltage to current transducer chip by described first resistance, and the negative electrode of described diode also connects input voltage.
Further, described current output circuit includes audion, field effect transistor, diac；The colelctor electrode of described audion electrically connects with the raster data model end of described Voltage to current transducer chip, and the emitter stage of described audion electrically connects with the source electrode line end of described Voltage to current transducer chip；The emitter stage of described audion electrically connects also by the source electrode of the second resistance with described field effect transistor, and the base stage of described audion electrically connects with the described source electrode stating field effect transistor；The drain electrode of described field effect transistor is connected by the negative electricity of the first electric capacity with described power circuit, the drain electrode of described field effect transistor also one end with the 3rd resistance electrically connects, the other end of described 3rd resistance is connected with the negative electricity of described power circuit by described diac, and the other end of described 3rd resistance also forms current output terminal.
Further, described control circuit includes the 4th resistance, the 5th resistance, one end of described 4th resistance electrically connects with the output inefficacy end of described Voltage to current transducer chip, and one end of described 4th resistance forms the current controling end of described control circuit, another termination 5V power supply of described 4th resistance；One end of described 5th resistance electrically connects with the error flag end of described Voltage to current transducer chip, and the other end of described 5th resistance forms the end of makeing mistakes of described control circuit.
Further, described power circuit includes working power, the 6th resistance, the second electric capacity, the 7th resistance；The positive pole of described working power electrically connects with one end of described 6th resistance, and the other end of described 6th resistance electrically connects with the positive power source terminal of described Voltage to current transducer chip, and the other end of described 6th resistance also one end with described second electric capacity electrically connects；The other end of described second electric capacity electrically connects with the negative power end of described Voltage to current transducer chip, and the other end of described second electric capacity also negative electricity with described working power is connected；The conversion ratio of described Voltage to current transducer chip arranges end and is connected with the negative electricity of described working power also by described 7th resistance.
Further, the model of described Voltage to current transducer chip is XTR111.
Further, the model of described audion is MMBT2907, and the model of described field effect transistor is NTF2955, and the model of described diac is SMAJ30.
Compared with prior art, this utility model has the advantage that
A kind of data communication interface equipment that the present invention provides, voltage signal is converted to current signal and carries out remote transmission, owing to current signal is not readily susceptible to interference, current source internal resistance is infinitely great, conductor resistance series connection does not the most affect precision, can transmit hundreds of meters on general twisted-pair power cable, current signal transfer mode can be widely used in industry spot.
Accompanying drawing explanation
Below by the way of the most understandable, accompanying drawings preferred implementation, above-mentioned characteristic, technical characteristic, advantage and the implementation thereof of a kind of data communication interface equipment is further described.
Fig. 1 is the structured flowchart of this utility model a kind of data communication interface equipment；
Fig. 2 is the circuit theory diagrams of this utility model a kind of data communication interface equipment.
Drawing reference numeral illustrates:
10 Voltage to current transducer interface 20 voltage input circuit 30 current output circuits
40 control circuit 50 power circuits
XTR111 Voltage to current transducer chip R1 the first resistance R2 the second resistance
R3 the 3rd resistance R4 the 4th resistance R5 the 5th resistance
R6 the 6th resistance R7 the 7th resistance Q1 audion
Q2 field effect transistor D1 diode D2 diac
C1 the first electric capacity C2 the second electric capacity
Detailed description of the invention
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below comparison accompanying drawing is illustrated detailed description of the invention of the present utility model.Apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings, and obtain other embodiment.
For making simplified form, only schematically show the part relevant to this utility model in each figure, they do not represent its practical structures as product.It addition, so that simplified form readily appreciates, some figure has the parts of identical structure or function, only symbolically depicts one of them, or only marked one of them.In this article, " one " not only represents " only this ", it is also possible to represent the situation of " more than one ".
Fig. 1 is the structured flowchart of this utility model a kind of data communication interface equipment.As shown in Figure 1, a kind of data communication interface equipment, including Voltage to current transducer interface 10, voltage input circuit 20, current output circuit 30, control circuit 40, power circuit 50, described Voltage to current transducer interface 10 electrically connects with described voltage input circuit 20, described Voltage to current transducer interface 10 electrically connects with described current output circuit 30, described Voltage to current transducer interface 10 electrically connects with described control circuit 40, and described Voltage to current transducer interface 10 also electrically connects with described power circuit 50.
Fig. 2 is the circuit theory diagrams of this utility model a kind of data communication interface equipment.As shown in Figure 2, further preferred, described Voltage to current transducer interface 10 includes Voltage to current transducer chip, the model of described Voltage to current transducer chip is XTR111, described voltage input circuit 20 includes that the first resistance R1, described Voltage to current transducer chip XTR111 connect input voltage by described first resistance R1.
Described voltage input circuit 20 also includes diode D1, the anode of described diode D1 is connected with the negative electricity of described power circuit 50, the negative electrode of described diode D1 is electrically connected with described Voltage to current transducer chip XTR111 by described first resistance R1, the negative electrode of described diode D1 also connects input voltage, and this voltage is voltage signal waiting for transmission or voltage signal to be converted.
It is further preferred that described current output circuit 30 includes that audion Q1, field effect transistor Q2, diac D2, the model of described audion Q1 are MMBT2907, the model of described field effect transistor Q2 is NTF2955；
The colelctor electrode of described audion Q1 electrically connects with the raster data model end VG of described Voltage to current transducer chip XTR111, and the emitter stage of described audion Q1 electrically connects with the source electrode line end IS of described Voltage to current transducer chip XTR111；
The emitter stage of described audion Q1 electrically connects with the source electrode of described field effect transistor Q2 also by the second resistance R2, and the base stage of described audion Q1 electrically connects with the described source electrode stating field effect transistor Q2；
The drain electrode of described field effect transistor Q2 is connected by the negative electricity of the first electric capacity C1 with described power circuit 50, the drain electrode of described field effect transistor Q2 also one end with the 3rd resistance R3 electrically connects, the other end of described 3rd resistance R3 is connected with the negative electricity of described power circuit 50 by diac D2, the other end of described 3rd resistance R3 also forms current output terminal 4-20MA-2, and this current output terminal is the current output terminal of data communication interface.
Further preferred, described control circuit 40 includes the 4th resistance R4, the 5th resistance R5, one end of described 4th resistance R4 electrically connects with the output inefficacy end OD of described Voltage to current transducer chip XTR111, one end of described 4th resistance R4 forms another termination 5V positive source of the current controling end XTR11_OD2 of described control circuit 40, described 4th resistance R4；
One end of described 5th resistance R5 and the error flag end of described Voltage to current transducer chip XTR111Electrical connection, the other end of described 5th resistance R5 forms the end XTR11_EF2 that makes mistakes of described control circuit 40.
Further preferred, described power circuit 50 includes 24V working power, the 6th resistance R6, the second electric capacity C2, the 7th resistance R7, the positive pole of described 24V working power electrically connects with one end of described 6th resistance R6, the other end of described 6th resistance R6 electrically connects with the positive power source terminal VSP of described Voltage to current transducer chip XTR111, and the other end of described 6th resistance R6 also one end with the second electric capacity C2 electrically connects；
The other end of described second electric capacity C2 electrically connects with the negative power end GND of described Voltage to current transducer chip XTR111, and the other end of described second electric capacity C2 also negative electricity with described 24V working power is connected；
The conversion ratio of described Voltage to current transducer chip XTR111 is arranged holds SET to be connected also by the negative electricity of the 7th resistance R7 with described 24V working power.
In conjunction with accompanying drawing Fig. 1, the operation principle of notebook data Communications Interface Unit is further illustrated, as follows:
Notebook data Communications Interface Unit can export 0～20mA (difference) electric current or 4～20mA (difference) electric current, utilizes Voltage to current transducer chip XTR111 and its peripheral circuit to realize voltage and is converted to electric current output.Voltage to current transducer chip XTR111 is a to be specifically designed for standard 0mA-20mA or 4mA-20mA analogue signal and well-designed high precision electro is depressed into current converter (voltage-to-currentconverter), and it can provide the electric current of up to 36mA.The ratio of input voltage with output electric current can be configured by the 7th resistance R7.Additionally, Voltage to current transducer chip XTR111 also can be adjusted for voltage output.Outside field effect transistor (P-MOSFET transistor) Q2 can ensure that and realizes high output impedance and wide in range compliance voltage scope, from the VSP voltage of 2V to the voltage less than GND.The output of adjustable 3V～15V manostat can provide supply voltage for extra Circuits System.
The upper limit takes 20mA and is because the spark energy that the current switching of explosion-proof requirement: 20mA causes and is not enough to the gas that ignites, and less than the 4mA signal higher than 20mA for the low alarm setting of various faults.The reason not taking 0mA is to detect broken string, is not less than 4mA, reduces to 0mA when transmission line because of failure to trip, loop current during normal work.
4～20mA electric current loops have a two types: two-wire system and three-wire system.When monitoring system needs the driving element such as valve etc. by long distance driver is on-the-spot, general employing three-wire system transmitter, here current output module is positioned at the system end of monitoring, system directly power to current output module, and power supply is the 3rd line beyond two electric current transmission lines.Two-wire system is current output module and sensor is positioned at on-the-spot end, owing to power difficulty, usually receiving terminal of scene utilizes the electric current loop cable of 4～20mA to power to the current output module of far-end, by the 4～20mA sizes reflecting signal.
Typical case's application of 4～20mA products is sensing and measures application.There is the sensor of numerous species can be converted into the current signal of 4～20mA in industry spot.The concept of transmitter is that the non-standard signal of telecommunication is converted to the instrument of standard electric signal (0/4～20mADC, 1～5VDC, 0～10VDC).Sensor is the measured of the hard to bear regulation of energy the device or the general name of device that are converted into usable output signal according to certain rule, is generally made up of sensing element and conversion element.When sensor is output as the standard signal of regulation, the most referred to as transmitter.
It should be noted that, above-described embodiment all can independent assortment as required.The above is only preferred implementation of the present utility model; it should be pointed out that, for those skilled in the art, on the premise of without departing from this utility model principle; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection domain of the present utility model.
Claims (8)
1. a data communication interface equipment, it is characterised in that:
Including Voltage to current transducer interface, voltage input circuit, current output circuit, control circuit, power circuit；Described Voltage to current transducer interface electrically connects with described voltage input circuit, described Voltage to current transducer interface electrically connects with described current output circuit, described Voltage to current transducer interface electrically connects with described control circuit, and described Voltage to current transducer interface also electrically connects with described power circuit.
2. data communication interface equipment as claimed in claim 1, it is characterised in that:
Described Voltage to current transducer interface includes that Voltage to current transducer chip, described voltage input circuit include that the first resistance, described Voltage to current transducer chip connect input voltage by described first resistance.
3. data communication interface equipment as claimed in claim 2, it is characterised in that:
Described voltage input circuit also includes diode, the anode of described diode is connected with the negative electricity of described power circuit, the negative electrode of described diode is electrically connected with described Voltage to current transducer chip by described first resistance, and the negative electrode of described diode also connects input voltage.
4. data communication interface equipment as claimed in claim 1, it is characterised in that:
Described current output circuit includes audion, field effect transistor, diac；
The colelctor electrode of described audion electrically connects with the raster data model end of described Voltage to current transducer chip, and the emitter stage of described audion electrically connects with the source electrode line end of described Voltage to current transducer chip；
The emitter stage of described audion electrically connects also by the source electrode of the second resistance with described field effect transistor, and the base stage of described audion electrically connects with the source electrode of described field effect transistor；
The drain electrode of described field effect transistor is connected by the negative electricity of the first electric capacity with described power circuit, the drain electrode of described field effect transistor also one end with the 3rd resistance electrically connects, the other end of described 3rd resistance is connected with the negative electricity of described power circuit by described diac, and the other end of described 3rd resistance also forms current output terminal.
5. data communication interface equipment as claimed in claim 1, it is characterised in that:
Described control circuit includes the 4th resistance, the 5th resistance, one end of described 4th resistance electrically connects with the output inefficacy end of described Voltage to current transducer chip, one end of described 4th resistance forms the current controling end of described control circuit, another termination 5V power supply of described 4th resistance；
One end of described 5th resistance electrically connects with the error flag end of described Voltage to current transducer chip, and the other end of described 5th resistance forms the end of makeing mistakes of described control circuit.
6. data communication interface equipment as claimed in claim 1, it is characterised in that:
Described power circuit includes working power, the 6th resistance, the second electric capacity, the 7th resistance；
The positive pole of described working power electrically connects with one end of described 6th resistance, and the other end of described 6th resistance electrically connects with the positive power source terminal of described Voltage to current transducer chip, and the other end of described 6th resistance also one end with described second electric capacity electrically connects；
The other end of described second electric capacity electrically connects with the negative power end of described Voltage to current transducer chip, and the other end of described second electric capacity also negative electricity with described working power is connected；
The conversion ratio of described Voltage to current transducer chip arranges end and is connected with the negative electricity of described working power also by described 7th resistance.
7. data communication interface equipment as claimed in claim 2, it is characterised in that:
The model of described Voltage to current transducer chip is XTR111.
8. data communication interface equipment as claimed in claim 4, it is characterised in that:
The model of described audion is MMBT2907, and the model of described field effect transistor is NTF2955, and the model of described diac is SMAJ30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620260623.7U CN205451470U (en) | 2016-03-31 | 2016-03-31 | Data communication interface device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620260623.7U CN205451470U (en) | 2016-03-31 | 2016-03-31 | Data communication interface device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205451470U true CN205451470U (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620260623.7U Expired - Fee Related CN205451470U (en) | 2016-03-31 | 2016-03-31 | Data communication interface device |
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| Country | Link |
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| CN (1) | CN205451470U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113503933A (en) * | 2021-08-04 | 2021-10-15 | 上海朝辉压力仪器有限公司 | Hall flowmeter with current output function |
-
2016
- 2016-03-31 CN CN201620260623.7U patent/CN205451470U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113503933A (en) * | 2021-08-04 | 2021-10-15 | 上海朝辉压力仪器有限公司 | Hall flowmeter with current output function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160810 Termination date: 20190331 |