CN107422178B - A kind of transmitter that electric current is gone to voltage - Google Patents
A kind of transmitter that electric current is gone to voltage Download PDFInfo
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- CN107422178B CN107422178B CN201710663154.2A CN201710663154A CN107422178B CN 107422178 B CN107422178 B CN 107422178B CN 201710663154 A CN201710663154 A CN 201710663154A CN 107422178 B CN107422178 B CN 107422178B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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Abstract
This application discloses a kind of transmitter that electric current is gone to voltage, which includes current source circuit, current converter circuit, voltage conversion circuit, in which: the current source circuit is used to provide stable DC stream for the current converter circuit；The first current range that the current converter circuit is used to input is converted to the second current range；The voltage conversion circuit is used to second current range being converted to predetermined voltage range.The standard 4-20mA current signal that sensor exports can be converted to the universal transmitter for meeting the 0-5V voltage signal of analog-digital converter input requirements by the transmitter；Small in size suitable for -25 DEG C~85 DEG C of processing temperature, conversion accuracy is high.
Description
Technical field
The invention belongs to circuit design field more particularly to a kind of transmitters that electric current is gone to voltage.
Background technique
In many industrial applications, need to use sensor, such as pressure sensor, temperature sensor etc..In order to meet
It transmits at a distance and anti-interference, the output of most of sensors is all standard 4-20mA current signal, but analog-digital converter
The general requirement of the input of ADC is the voltage signal of 0-5V.Though there is 4-20mA to turn the module of 0-5V in the market, it is sufficiently bulky,
The requirement of unsuitable high-density circuit；And be that transformed error is larger, the unsuitable higher occasion of performance requirement.Although
Burr Brown company once released a dedicated convert chip RCV420, but the chip is only operable on 0 DEG C~70 DEG C
At a temperature of, significantly limit the practicability of the chip.So the present invention devises one kind.
Summary of the invention
The purpose of the present invention, there is provided a kind of small sizes, the general of precision, width range of working temperature (- 25 DEG C~85 DEG C)
Electric current goes to the transmitter of voltage, which includes current source circuit, current converter circuit, voltage conversion circuit, in which:
The current source circuit is used to provide stable DC stream for the current converter circuit；
The first current range that the current converter circuit is used to input is converted to the second current range；
The voltage conversion circuit is used to second current range being converted to predetermined voltage range.
Optionally, which includes: first resistor, second resistance, capacitor, first passage and 3rd resistor,
Wherein:
The first end of the first resistor first end phase with the current input terminal of the transmitter and the second resistance respectively
Even, the second end of the first resistor respectively with the output end of the current source circuit, the first end of the capacitor and the first passage
First input end be connected；
Second input terminal of the first passage is connected with the output end of the first passage, the third input terminal of the first passage
Positive direct-current voltages and negative dc voltage are connect respectively with the 4th input terminal, the output end of the first passage and the first of the 3rd resistor
End is connected；
The second end of the second resistance is connected with the second end of the second end of the capacitor and the 3rd resistor respectively.
Optionally, which includes: the 4th resistance and second channel, in which:
The first input end of the second channel first end phase with the second end of the 3rd resistor and the 4th resistance respectively
Even, the second input end grounding of the second channel；
The second end of the output end of the second channel and the 4th resistance is connect with the voltage output end of the transmitter.
Optionally, the voltage of the positive direct-current voltages is located at 6V between 18V, and the voltage of the negative dc voltage is located at -6V
Between to -18V.
Optionally, the resistance value of the first resistor is 19.5k Ω, and the resistance value of the second resistance is 100 Ω, the 3rd resistor
Resistance value is 400 Ω, and the resistance value of the 4th resistance is 250 Ω, and the capacitance of the capacitor is 0.01uF.
Optionally, the DC current of current source circuit output end output is 100 μ A.
Optionally, which is 4-20mA.
Optionally, which is 0-20 mA.
Optionally, which is 0-5V.
Compared with traditional circuit that electric current is switched to voltage, advantage is the present invention: the transmitter can be by sensor
The standard 4-20mA current signal of output is converted to the general pick-up for meeting the 0-5V voltage signal of analog-digital converter input requirements
Device；The operating temperature range of transmitter can be extended to -25 DEG C~85 DEG C by the circuit design of the transmitter, small in size, such as
It can be 19mm × 19mm × 3.5mm by the volume-diminished of transmitter, and reduce transmitter self noise, improve conversion essence
Degree.
It should be understood that the above general description and the following detailed description are merely exemplary, this can not be limited
Invention.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
The circuit diagram of Fig. 1 is that is provided in one embodiment of the invention the go to electric current transmitter of voltage.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistented with the present invention.On the contrary, they be only with it is such as appended
The example of device and method being described in detail in claims, some aspects of the invention are consistent.
It includes current source circuit U1, electric current conversion electricity that is provided in the embodiment of the present invention, which goes to electric current the transmitter of voltage,
Road, voltage conversion circuit, in which: current source circuit is used to provide stable DC stream for current converter circuit；Electric current conversion
The first current range that circuit is used to input is converted to the second current range；Voltage conversion circuit is used for the second current range
Be converted to predetermined voltage range.
It is shown in Figure 1, the electricity for the transmitter of voltage that is that is provided in one embodiment of the invention go to electric current
Lu Tu, the current source circuit in the transmitter can be Precision Current Component, and output end exports stable DC stream, the direct current
Electric current can be 100 μ A.This current source circuit is designed as what those skilled in the art can realize, and internal circuit knot
Structure is not intended as present invention point, therefore just repeats no more here.
Above-mentioned current converter circuit includes: first resistor R1, second resistance R2, capacitor C, first passage U2A and third electricity
R3 is hindered, relevant connection is as follows:
The first end of first resistor R1 is connected with the first end of the current input terminal of transmitter and second resistance R2 respectively,
The second end of first resistor R1 respectively with the output end of current source circuit U1, the first end of capacitor C and first passage U2A
One input terminal is connected.
The second input terminal of first passage U2A is connected with the output end of first passage U2A, and the third of first passage U2A is defeated
Enter end and the 4th input terminal connects positive direct-current voltages and negative dc voltage, the output end and 3rd resistor R3 of first passage U2A respectively
First end be connected.
The second end of second resistance R2 is connected with the second end of the second end of capacitor C and 3rd resistor R3 respectively.
It in one possible implementation, is 4-20mA with the first current range, the second current range is that 0-20 mA is
Example, the resistance value of first resistor are 19.5k Ω, and the resistance value of the second resistance is 100 Ω, and the resistance value of the 3rd resistor is 400
Ω, the capacitance of capacitor are 0.01uF, the honest galvanic electricity that the third input terminal and the 4th input terminal of first passage U2A is connect respectively
The voltage of pressure is located at 6V between 18V, and the voltage of negative dc voltage is located between -6V to -18V, for example positive direct-current voltages are 9V,
Negative dc voltage is -9V.
Above-mentioned voltage conversion circuit includes: the 4th resistance R4 and second channel U2B, and relevant connection is as follows:
The first input end of the second channel U2B first end phase with the second end of 3rd resistor R3 and the 4th resistance R4 respectively
Even, the second input end grounding of second channel U2B；The second end of the output end of second channel U2B and the 4th resistance R4 with change
The voltage output end of device is sent to connect.
In one possible implementation, be 0-20 mA with the second current range, predetermined voltage range is that 0-5V is
Example, the resistance value of the 4th resistance are 250 Ω.
In actual implementation, " empty short ", " void is disconnected " principle of above-mentioned two operational amplifier is mainly utilized, that is, uses direct current
Current source of the 9V to the current source circuit U1(model REF200AU such as selected) power supply, the DC current configuration output it
For 100 μ A；Then the binary channels operational amplifier of model OPA2141 is such as selected to first passage U2A(with direct current ± 9V)
Power supply, by 4-20mA signal (for transmitter, this electric current is sourcing current) input transducer, transmitter converts this signal
For 0-5V voltage signal, and 4-20mA signal and 0-5V signal are linear.
In conclusion the transmitter proposed by the present invention that electric current is gone to voltage, passes through above-mentioned connection and design, the pick-up
Electrical part required for device is fewer, therefore the volume of transmitter is very small；Above-mentioned resistance value be 19.5k Ω first resistor R1,
Second resistance R2 that resistance value is 100 Ω, the 3rd resistor R3 that resistance value is 400 Ω, the 4th resistance R4 that resistance value is 250 Ω, capacitor
Capacitor C that value is 0.01uF, output DC current be the current source of 100 μ A and binary channels operational amplifier be in the market compared with
The electrical part being readily available, therefore above-mentioned transmitter is very easy to realize；In addition, the operating temperature range of above-mentioned transmitter may be used also
To be extended to -25 DEG C~85 DEG C；And foregoing circuit connection and design, reduce transmitter self noise, improve conversion accuracy.
Those skilled in the art will readily occur to of the invention its after considering specification and the invention applied here of practice
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
The common knowledge in the art that person's adaptive change follows general principle of the invention and do not invent including the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (9)
1. a kind of transmitter that electric current is gone to voltage, which is characterized in that the transmitter includes current source circuit, electric current conversion
Circuit, voltage conversion circuit, in which:
The current source circuit is used to provide stable DC stream for the current converter circuit；
The first current range that the current converter circuit is used to input is converted to the second current range；
The voltage conversion circuit is used to second current range being converted to predetermined voltage range.
2. transmitter according to claim 1, which is characterized in that the current converter circuit includes: first resistor, second
Resistance, capacitor, the first passage of binary channels operational amplifier and 3rd resistor, in which:
The first end of the first resistor first end with the current input terminal of the transmitter and the second resistance respectively
Be connected, the second end of the first resistor respectively with the output end of the current source circuit, the first end of the capacitor and institute
The first input end for stating first passage is connected；
Second input terminal of the first passage is connected with the output end of the first passage, the third input of the first passage
End and the 4th input terminal connect positive direct-current voltages and negative dc voltage, the output end of the first passage and the 3rd resistor respectively
First end be connected；
The second end of the second resistance is connected with the second end of the second end of the capacitor and the 3rd resistor respectively.
3. transmitter according to claim 2, which is characterized in that the voltage conversion circuit includes: the 4th resistance and institute
State the second channel of binary channels operational amplifier, in which:
The first input end of the second channel first end with the second end of the 3rd resistor and the 4th resistance respectively
It is connected, the second input end grounding of the second channel；
The second end of the output end of the second channel and the 4th resistance is connect with the voltage output end of the transmitter.
4. transmitter according to claim 2, which is characterized in that the voltage of the positive direct-current voltages be located at 6V to 18V it
Between, the voltage of the negative dc voltage is located between -6V to -18V.
5. transmitter according to claim 3, which is characterized in that the resistance value of the first resistor is 19.5k Ω, described the
The resistance value of two resistance is 100 Ω, and the resistance value of the 3rd resistor is 400 Ω, and the resistance value of the 4th resistance is 250 Ω, described
The capacitance of capacitor is 0.01uF.
6. transmitter according to claim 1, which is characterized in that the DC current of the current source circuit output end output
For 100 μ A.
7. according to claim 1 to any transmitter in 6, which is characterized in that first current range is 4-20mA.
8. transmitter according to claim 7, which is characterized in that second current range is 0-20 mA.
9. transmitter according to claim 8, which is characterized in that the predetermined voltage range is 0-5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710663154.2A CN107422178B (en) | 2017-08-05 | 2017-08-05 | A kind of transmitter that electric current is gone to voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710663154.2A CN107422178B (en) | 2017-08-05 | 2017-08-05 | A kind of transmitter that electric current is gone to voltage |
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| Publication Number | Publication Date |
|---|---|
| CN107422178A CN107422178A (en) | 2017-12-01 |
| CN107422178B true CN107422178B (en) | 2019-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710663154.2A Active CN107422178B (en) | 2017-08-05 | 2017-08-05 | A kind of transmitter that electric current is gone to voltage |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109012051A (en) * | 2018-09-25 | 2018-12-18 | 李丹丹 | Electric current is gone to the transmitter of voltage |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204559542U (en) * | 2015-04-29 | 2015-08-12 | 南京磐能电力科技股份有限公司 | A kind of current-to-voltage converting circuit with inputting biased and active power filtering |
| CN205506910U (en) * | 2016-04-15 | 2016-08-24 | 常州信息职业技术学院 | Little current -to -voltage convertor circuit |
| CN206041965U (en) * | 2016-09-26 | 2017-03-22 | 航天长峰朝阳电源有限公司 | High -precision 4~20mA converts 10V's current -voltage conversion module to |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3759117B2 (en) * | 2003-03-28 | 2006-03-22 | 川崎マイクロエレクトロニクス株式会社 | I / V conversion circuit and DA converter |
-
2017
- 2017-08-05 CN CN201710663154.2A patent/CN107422178B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204559542U (en) * | 2015-04-29 | 2015-08-12 | 南京磐能电力科技股份有限公司 | A kind of current-to-voltage converting circuit with inputting biased and active power filtering |
| CN205506910U (en) * | 2016-04-15 | 2016-08-24 | 常州信息职业技术学院 | Little current -to -voltage convertor circuit |
| CN206041965U (en) * | 2016-09-26 | 2017-03-22 | 航天长峰朝阳电源有限公司 | High -precision 4~20mA converts 10V's current -voltage conversion module to |
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| Publication number | Publication date |
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| CN107422178A (en) | 2017-12-01 |
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Address after: No. 98, Guangyi new village, Liangxi District, Wuxi City, Jiangsu Province, 214000 Patentee after: HAIYING ENTERPRISE GROUP Co.,Ltd. Address before: 214000 Jiangsu province Binhu District of Wuxi City, No. 20 Liangxi road 18 Patentee before: HAIYING ENTERPRISE GROUP Co.,Ltd. |
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Address after: No. 188, Guangyi Road, Liangxi District, Wuxi City, Jiangsu Province, 214000 Patentee after: HAIYING ENTERPRISE GROUP Co.,Ltd. Address before: No. 98, Guangyi new village, Liangxi District, Wuxi City, Jiangsu Province, 214000 Patentee before: HAIYING ENTERPRISE GROUP Co.,Ltd. |
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