CN103017798A - Resistance transmitter - Google Patents
Resistance transmitter Download PDFInfo
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- CN103017798A CN103017798A CN2012105462879A CN201210546287A CN103017798A CN 103017798 A CN103017798 A CN 103017798A CN 2012105462879 A CN2012105462879 A CN 2012105462879A CN 201210546287 A CN201210546287 A CN 201210546287A CN 103017798 A CN103017798 A CN 103017798A
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Abstract
The invention provides a resistance transmitter. The resistance transmitter comprises a power source, a signal collecting circuit, a signal conditioning circuit and a V/I converting circuit, wherein the signal collecting circuit uses an operational amplifier to form a constant current source, the signal conditioning circuit uses the operational amplifier to form a voltage follower, and the V/I converting circuit is composed of the operational amplifier and a triode. A constant current generated by the constant current source is added on a measured resistance. Voltage signals collected by the measured resistance are converted into current signals after being conditioned by the voltage follower and the current signals of 0-20mA are output through an emitter of the triode for use. The resistance transmitter has the advantages of being capable of using the current signals of 0-20mA to transmit the signals collected by the measured resistance stably and reliably and increasing anti-interference of the signals due to the facts that the signal collecting circuit, the signal conditioning circuit and the V/I converting circuit are used and an anti-interference network is arranged, and being simple and reasonable in structure, and convenient to use.
Description
Technical field
The present invention relates to technology of instrument and meter, particularly a kind of resistance converter.
Background technology
Usually, the equipment aperture signal feedback such as variable valve are to adopt the resistance of 0-1K, are fixed voltage at the resistance two ends, and the voltage signal that then gets according to dividing potential drop is determined the aperture of valve.This acquisition method collection be voltage signal, the transmission the way in be interfered easily, result of use is poor.
Summary of the invention
Purpose of the present invention is exactly the defects that will overcome prior art, and a kind of resistance converter is provided, and can reliablely and stablely transmit the signal of measured electrical resistance collection, and increases Anti-jamming of signal, and it is simple and reasonable, and is easy to use.
For achieving the above object, resistance converter provided by the invention, comprise power supply, the signal acquisition circuit of contacting successively, signal conditioning circuit and V/I translation circuit, wherein, signal acquisition circuit adopts the first operational amplifier and the second coupled operational amplifier to consist of constant current source, signal conditioning circuit adopts the 3rd operational amplifier to consist of voltage follower, the V/I translation circuit adopts four-operational amplifier and coupled transistor to consist of, the steady current that constant current source generates is added on the measured resistance, by the voltage signal of measured electrical resistance collection after the voltage follower conditioning, be converted into current signal through four-operational amplifier again, and export the 0-20mA current signal for use through the emitter-base bandgap grading of transistor.
Resistance converter provided by the invention, wherein said signal acquisition circuit also comprises resistance R 5, resistance R 6, resistance R 7, resistance R 9, resistance R 12, resistance R 14, resistance R 16, resistance R 17, stabilivolt, capacitor C 6 and capacitor C 10, resistance R 5 and stabilivolt series connection are in electric power loop, resistance R 9, resistance R 12 and resistance R 16 mutually series connection are rear in parallel with stabilivolt, the adjustable end of described resistance R 9 links to each other with the node of described resistance R 5 and stabilivolt, the 3rd end of described stabilivolt links to each other with the node of resistance R 12 with resistance R 16, capacitor C 6 is in parallel with stabilivolt, resistance R 5 and the node of connecting of stabilivolt are connected to the positive input of the first operational amplifier through resistance R 6, the reverse input end of described the first operational amplifier is through described resistance R 10 ground connection, the reverse input end of described the first operational amplifier also links to each other with the output terminal of described the first operational amplifier through described resistance R 14, the output terminal of the first operational amplifier is through resistance R 7 and capacitor C 10 ground connection, the second operational amplifier is made of resistance R 17 to be penetrated with feedback, the reverse input end that is described the second operational amplifier links to each other with its output terminal, the positive input of described the second operational amplifier links to each other with the node of described resistance R 17 and capacitor C 10, the output terminal of the second operational amplifier is connected to the positive input of the first operational amplifier through resistance R 4, and the two ends of capacitor C 10 link to each other with measured resistance.
Resistance converter of the present invention, wherein said signal conditioning circuit also comprises resistance R 7 and another stabilivolt, the positive input of the 3rd operational amplifier is in parallel with the positive input of the second operational amplifier, the reverse input end of described the 3rd operational amplifier links to each other with the output terminal of described the 3rd operational amplifier, and the output terminal of the 3rd operational amplifier exports the next stage circuit to through the node of resistance R 7 and another stabilivolt.
Resistance converter of the present invention, wherein said V/I translation circuit also comprises resistance R 8, resistance R 2, resistance R 3, resistance R 15, capacitor C 8, resistance R 13 and switching diode, the node of resistance R 7 and another stabilivolt is connected to the positive input of four-operational amplifier through resistance R 8, the output terminal of four-operational amplifier links to each other with the base stage of transistor, resistance R 2 and resistance R 3 consist of penetrates with feedback, its minute is crimped to the reverse input end of four-operational amplifier, the positive input of described four-operational amplifier links to each other with the node of capacitor C 8 with described resistance R 13 and switching diode through the described resistance R 15 of parallel connection, the other end of described resistance R 13 links to each other with the emitter-base bandgap grading of described transistor, the collector of described transistor links to each other with power supply, and the 0-20mA current signal is through resistance R 13 and switching diode output.
Resistance converter of the present invention, wherein said V/I translation circuit is provided with anti-interference network, anti-interference network comprises capacitor C 11 and the ferrite bean L2 of mutual series connection, and capacitor C 11 is connected to the switching diode output terminal with the node of ferrite bean, ferrite bean output 0-20mA anti-jamming signal.
Resistance converter of the present invention also comprises connection terminal, and 1, the 3 pin input 24V direct-current power supply internal circuit of connection terminal uses, and measured resistance is connected to 4,5 pin of connection terminal, and the output of 0-20mA current signal is connected to 6,7 pin of connection terminal.
Advantage and the good effect of resistance converter of the present invention are: owing to adopted signal acquisition circuit, signal conditioning circuit and V/I translation circuit, be provided with anti-interference network, can reliablely and stablely transmit with the 0-20mA current signal signal of measured electrical resistance collection, and increase Anti-jamming of signal, it is simple and reasonable, and is easy to use.
Be elaborated with reference to accompanying drawing below in conjunction with embodiment.
Description of drawings
Fig. 1 is the circuit theory diagrams of resistance converter of the present invention;
Fig. 2 is the terminals subgraph of resistance converter of the present invention.
Embodiment
Describe the embodiment of resistance converter of the present invention in detail below in conjunction with accompanying drawing.
With reference to Fig. 1, resistance converter provided by the invention comprises signal acquisition circuit, signal conditioning circuit, V/I translation circuit and power supply.
Signal acquisition circuit adopts the first operational amplifier U1D and the second operational amplifier U1C to consist of constant current source.Wherein, resistance R 5 and stabilivolt D3 series connection are in electric power loop, resistance R 9, it is in parallel with stabilivolt D3 after resistance R 12 and resistance R 16 are connected successively, the adjustable end of resistance R 9 links to each other with the node of resistance R 5 with stabilivolt D3, the 3rd end of stabilivolt D3 links to each other with the node of resistance R 12 with resistance R 16, capacitor C 6 is in parallel with stabilivolt D3, resistance R 5 and the node of connecting of stabilivolt D3 are connected to the positive input of the first operational amplifier U1D through resistance R 6, the reverse input end of the first operational amplifier U1D is through resistance R 10 ground connection, and the reverse input end of the first operational amplifier U1D also links to each other through the output terminal of resistance R 14 with the first operational amplifier U1D.The output terminal of the first operational amplifier U1D is through resistance R 17 and capacitor C 10 ground connection, and the two ends of capacitor C 10 are connected to respectively terminal 4,5 pin.The second operational amplifier U1C is made of resistance R 17 and penetrates with feedback, namely the reverse input end of the second operational amplifier U1C links to each other with its output terminal, the positive input of the second operational amplifier U1C links to each other with the node of resistance R 17 with capacitor C 10, and the output terminal of the second operational amplifier U1C is connected to the positive input of operational amplifier U1D through resistance R 4.
Measured resistance is connected in the constant current source through 4,5 pin of terminal, constant current source generates stable electric current and is added on the measured resistance, when resistance changed, because the electric current that flows through is constant, the voltage that gathers between terminal 4,5 pin will be along with the variation linear change of resistance.
Signal conditioning circuit adopts the 3rd operational amplifier U1B to consist of voltage follower, and the resistance signal voltage of collection stably is delivered to the next stage circuit by voltage follower.Wherein, the positive input of the 3rd operational amplifier U1B is in parallel with the positive input of the second operational amplifier U1C, the reverse input end of the 3rd operational amplifier U1B links to each other with the output terminal of the 3rd operational amplifier U1B, and the output terminal of the 3rd operational amplifier U1B exports the next stage circuit to through resistance R 7 and another stabilivolt D2.
The V/I translation circuit adopts four-operational amplifier U1A and transistor N1 to consist of, and the voltage signal that gathers is converted into current signal, by the emitter-base bandgap grading output 0-20mA current signal of transistor N1, for collecting devices such as PLC.Wherein, the node of resistance R 7 and another stabilivolt D2 is connected to the positive input of four-operational amplifier U1A through resistance R 8, the output terminal of four-operational amplifier U1A links to each other with the base stage of transistor N1, resistance R 2 and resistance R 3 consist of penetrates with feedback, its minute is crimped to the reverse input end of four-operational amplifier U1A, the positive input of four-operational amplifier U1A links to each other with the node of resistance R 13 with switching diode D4 with capacitor C 8 through the resistance R 15 of parallel connection, the other end of resistance R 13 links to each other with the emitter-base bandgap grading of transistor N1, and the collector of transistor N1 links to each other with power supply.The 0-20mA current signal is connected to 6,7 pin of terminal through resistance R 13, switching diode D4 and capacitor C 11 and the anti-interference network output that ferrite bean L2 consists of.
In conjunction with reference to Fig. 2, resistance converter provided by the invention is provided with connection terminal P1, and 1, the 3 pin input 24V direct-current power supply internal circuit of connection terminal P1 uses.The resistance signal that gathers is connected to 4,5 pin of connection terminal P1, and the output of 0-20mA current signal is connected to 6,7 pin of connection terminal P1.
Embodiment recited above is described preferred implementation of the present invention, is not that the spirit and scope of the present invention are limited.Under the prerequisite that does not break away from design concept of the present invention; various modification and improvement that this area ordinary person makes technical scheme of the present invention; all should drop into protection scope of the present invention, the technology contents that the present invention asks for protection all is documented in claims.
Claims (6)
1. resistance converter, comprise power supply, it is characterized in that: also comprise the successively signal acquisition circuit of series winding, signal conditioning circuit and V/I translation circuit, wherein, described signal acquisition circuit adopts the first operational amplifier (U1D) and coupled the second operational amplifier (U1C) to consist of constant current source, described signal conditioning circuit adopts the 3rd operational amplifier (U1B) to consist of voltage follower, described V/I translation circuit adopts four-operational amplifier (U1A) and coupled transistor (N1) to consist of, the steady current that described constant current source generates is added on the measured resistance, by the voltage signal of measured electrical resistance collection after described voltage follower conditioning, be converted into current signal through described four-operational amplifier (U1A) again, and export the 0-20mA current signal for use through the emitter-base bandgap grading of described transistor (N1).
2. resistance converter according to claim 1, it is characterized in that: wherein said signal acquisition circuit also comprises resistance R 5, resistance R 6, resistance R 7, resistance R 9, resistance R 12, resistance R 14, resistance R 16, resistance R 17, stabilivolt (D3), capacitor C 6 and capacitor C 10, described resistance R 5 and stabilivolt (D3) series connection are in electric power loop, described resistance R 9, resistance R 12 and resistance R 16 mutually series connection are rear in parallel with described stabilivolt (D3), the adjustable end of described resistance R 9 links to each other with the node of described resistance R 5 with stabilivolt (D3), the 3rd end of described stabilivolt (D3) links to each other with the node of resistance R 12 with resistance R 16, described capacitor C 6 is in parallel with described stabilivolt (D3), described resistance R 5 and the node of connecting of stabilivolt (D3) are connected to the positive input of described the first operational amplifier (U1D) through described resistance R 6, the reverse input end of described the first operational amplifier (U1D) is through described resistance R 10 ground connection, the reverse input end of described the first operational amplifier (U1D) also links to each other through the output terminal of described resistance R 14 with described the first operational amplifier (U1D), the output terminal of described the first operational amplifier (U1D) is through described resistance R 7 and capacitor C 10 ground connection, described the second operational amplifier (U1C) is made of described resistance R 17 to be penetrated with feedback, the reverse input end that is described the second operational amplifier (U1C) links to each other with its output terminal, the positive input of described the second operational amplifier (U1C) links to each other with the node of described resistance R 17 and capacitor C 10, the output terminal of described the second operational amplifier (U1C) is connected to the positive input of described the first operational amplifier (U1D) through described resistance R 4, and the two ends of described capacitor C 10 link to each other with measured resistance.
3. resistance converter according to claim 1 and 2, it is characterized in that: wherein said signal conditioning circuit also comprises resistance R 7 and another stabilivolt (D2), the positive input of described the 3rd operational amplifier (U1B) is in parallel with the positive input of described the second operational amplifier (U1C), the reverse input end of described the 3rd operational amplifier (U1B) links to each other with the output terminal of described the 3rd operational amplifier (U1B), and the output terminal of described the 3rd operational amplifier (U1B) exports the next stage circuit to through described resistance R 7 and another stabilivolt (D2).
4. resistance converter according to claim 3, it is characterized in that: wherein said V/I translation circuit also comprises resistance R 8, resistance R 2, resistance R 3, resistance R 13, resistance R 15, capacitor C 8, transistor (N1) and switching diode (D4), the node of described resistance R 7 and another stabilivolt (D2) is connected to the positive input of described four-operational amplifier (U1A) through resistance R 8, the output terminal of described four-operational amplifier (U1A) links to each other with the base stage of described transistor (N1), described resistance R 2 and resistance R 3 consist of penetrates with feedback, its minute is crimped to the reverse input end of described four-operational amplifier (U1A), the positive input of described four-operational amplifier (U1A) links to each other with the node of described resistance R 13 with switching diode (D4) with capacitor C 8 through the described resistance R 15 of parallel connection, the other end of described resistance R 13 links to each other with the emitter-base bandgap grading of described transistor (N1), the collector of described transistor (N1) links to each other with power supply, and described 0-20mA current signal is through described resistance R 13 and switching diode (D4) output.
5. resistance converter according to claim 4, it is characterized in that: wherein said V/I translation circuit is provided with anti-interference network, described anti-interference network comprises capacitor C 11 and the ferrite bean (L2) of mutual series connection, described capacitor C 11 is connected to described switching diode (D4) output terminal with the node of ferrite bean (L2), described ferrite bean (L2) output 0-20mA anti-jamming signal.
6. resistance converter according to claim 5, it is characterized in that: also comprise connection terminal (P1), 1, the 3 pin input 24V direct-current power supply internal circuit of described connection terminal (P1) uses, measured resistance is connected to 4,5 pin of described connection terminal (P1), and the output of 0-20mA current signal is connected to 6,7 pin of described connection terminal (P1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105462879A CN103017798A (en) | 2012-12-14 | 2012-12-14 | Resistance transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105462879A CN103017798A (en) | 2012-12-14 | 2012-12-14 | Resistance transmitter |
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| Publication Number | Publication Date |
|---|---|
| CN103017798A true CN103017798A (en) | 2013-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105462879A Pending CN103017798A (en) | 2012-12-14 | 2012-12-14 | Resistance transmitter |
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| CN (1) | CN103017798A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308075A (en) * | 2013-05-07 | 2013-09-18 | 赛卓电子科技（上海）有限公司 | Current output-type linear hall-effect sensor |
| CN103677041A (en) * | 2013-08-26 | 2014-03-26 | 湖北东光电子股份有限公司 | Resistance loop capable of achieving function of loop on-line resistance adjustment |
| CN107659311A (en) * | 2017-09-27 | 2018-02-02 | 航天科技控股集团股份有限公司 | A kind of vehicle-mounted AD Acquisition Circuit of wide scope |
| CN109831189A (en) * | 2019-01-31 | 2019-05-31 | 大禹电气科技股份有限公司 | A kind of voltage or the optional single channel output circuit of electric current |
Citations (4)
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| CN2055253U (en) * | 1989-05-08 | 1990-03-28 | 中国建筑科学研究院空气调节研究所 | Precise constant-current source type thermal resistance temp. transducer |
| US6356070B1 (en) * | 1997-11-12 | 2002-03-12 | Robert Bosch Gmbh | Sensor arrangement producing one output signal depending on sensor internal resistance and another, depending on a measured variable |
| CN201293698Y (en) * | 2008-12-02 | 2009-08-19 | 西安中星测控有限公司 | Pressure transmitter with temperature compensation circuit |
| CN102162740A (en) * | 2010-12-14 | 2011-08-24 | 中国飞机强度研究所 | Transmitter |
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2012
- 2012-12-14 CN CN2012105462879A patent/CN103017798A/en active Pending
Patent Citations (4)
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| CN2055253U (en) * | 1989-05-08 | 1990-03-28 | 中国建筑科学研究院空气调节研究所 | Precise constant-current source type thermal resistance temp. transducer |
| US6356070B1 (en) * | 1997-11-12 | 2002-03-12 | Robert Bosch Gmbh | Sensor arrangement producing one output signal depending on sensor internal resistance and another, depending on a measured variable |
| CN201293698Y (en) * | 2008-12-02 | 2009-08-19 | 西安中星测控有限公司 | Pressure transmitter with temperature compensation circuit |
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| 张雷杰: ""宽量程高精度铂电阻温度变送器设计"", 《导弹与航天运载技术》 * |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308075A (en) * | 2013-05-07 | 2013-09-18 | 赛卓电子科技（上海）有限公司 | Current output-type linear hall-effect sensor |
| CN103308075B (en) * | 2013-05-07 | 2016-08-03 | 赛卓电子科技（上海）有限公司 | Current output-type linear hall-effect sensor |
| CN103677041A (en) * | 2013-08-26 | 2014-03-26 | 湖北东光电子股份有限公司 | Resistance loop capable of achieving function of loop on-line resistance adjustment |
| CN107659311A (en) * | 2017-09-27 | 2018-02-02 | 航天科技控股集团股份有限公司 | A kind of vehicle-mounted AD Acquisition Circuit of wide scope |
| CN109831189A (en) * | 2019-01-31 | 2019-05-31 | 大禹电气科技股份有限公司 | A kind of voltage or the optional single channel output circuit of electric current |
| CN109831189B (en) * | 2019-01-31 | 2023-04-25 | 大禹电气科技股份有限公司 | Single-channel output circuit with selectable voltage or current |
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Application publication date: 20130403 |