CN103558894A - Current signal converter circuit - Google Patents
Current signal converter circuit Download PDFInfo
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- CN103558894A CN103558894A CN201310574963.8A CN201310574963A CN103558894A CN 103558894 A CN103558894 A CN 103558894A CN 201310574963 A CN201310574963 A CN 201310574963A CN 103558894 A CN103558894 A CN 103558894A
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Abstract
The invention relates to a current signal converter circuit. The current signal converter circuit comprises a current signal input terminal, a current signal output terminal, a voltage signal output terminal, an adjustable constant-current tube, a precision operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a second capacitor, wherein the current signal input terminal is connected with the adjustable constant-current tube and the current signal output terminal; one output terminal of the current signal output terminal is connected with the second resistor which is connected with a positive input terminal of the precision operational amplifier, and the other output terminal of the current signal output terminal is connected with a third resistor which is connected with a negative input terminal of the precision operational amplifier; the two output terminals of the current signal output terminal are connected in parallel with the first resistor and the first capacitor; the output terminal of the precision operational amplifier is connected with the voltage signal output terminal through the fourth resistor; a slide rheostat and the second capacitor are connected in parallel between the third resistor and the fourth resistor in a cross-over manner. The current signal converter circuit is simple in structure and is accurate and reliable in data output.
Description
Technical field
The present invention relates to current-voltage conversion circuit field, relate in particular to a kind of current signal converter circuit.
Background technology
During industry is manufactured, the sensor of 4-20mA current signal output is subject to numerous users' favor with long transmission distance, strong anti-interference performance.But, in transformation applications as pressure sensor signal in WY type rolling bearing pressing machine control system, control system sampled signal is generally used 0-5V voltage signal, therefore it is most important 4-20mA current signal need to be converted to 0-5V voltage signal, but because each sensor all exists certain deviation in signal minimum (4mA) and maximal value (20mA), in conventional change-over circuit, when sensor signal is minimum value (4mA) and maximal value (20mA), be not easy to obtain 0V voltage and 5V voltage, and circuit is complicated, output data out of true, bring very large trouble to the use in later stage.
Summary of the invention
In view of this, be necessary to provide a kind of simple, and the output signal can accurately obtain sensor signal and be minimum value (4mA) and maximal value (20mA) time is the current signal converter circuit of 0V voltage and 5V voltage.
The present invention realizes like this, a kind of current signal converter circuit, comprise current signal input end, current signal output end and voltage signal output end, also comprise capable of regulating constant current tube, precision operational-amplifier, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first electric capacity and the second electric capacity, described current signal input end connects capable of regulating constant current tube and current signal output end simultaneously, a lead-out terminal of described current signal output end connects one end of the second resistance, the other end of the second resistance connects the positive input of precision operational-amplifier, another lead-out terminal of described current signal output end connects one end of the 3rd resistance, the other end of the 3rd resistance connects the reverse input end of precision operational-amplifier, two output terminals of described current signal output end be connected in parallel described the first resistance and the first electric capacity, one end of one end of described the first resistance and the first electric capacity is connected with the second resistance, and the other end of the other end of the first resistance and the first electric capacity is connected with the first electric capacity, the output terminal of described precision operational-amplifier connects voltage signal output end by the 4th resistance, between described the 3rd resistance and the 4th resistance, be provided with slide rheostat and the second electric capacity, described slide rheostat and the second Capacitance parallel connection are connected across between described the 3rd resistance and the 4th resistance.
Further, between described current signal input end and capable of regulating constant current tube, be provided with diode, described current signal input end connects the positive pole of diode, and capable of regulating constant current tube connects the negative pole of diode.
Further, described capable of regulating constant current tube is provided with adjustable resistance, and described adjustable resistance is connected with capable of regulating constant current tube by the 5th resistance.
The advantage of a kind of current signal converter circuit provided by the invention is: the present invention is simple in structure, by the adjustable resistance on capable of regulating constant current tube and capable of regulating constant current tube is set, by regulating adjustable resistance, obtain accurate 0V voltage signal output, by precision operational-amplifier and slide rheostat are set, by regulating slide rheostat to make precision operational-amplifier enlargement factor, obtain accurate 5V voltage signal output, accurately reliable, be adapted in WY type rolling bearing pressing machine control system the transformation applications as pressure sensor signal.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of current signal converter circuit of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, Fig. 1 is the circuit diagram of a kind of current signal converter circuit of the present invention.
Described a kind of current signal converter circuit, comprise current signal input end CJ2, current signal output end JC1 and voltage signal output end CJ4, also comprise capable of regulating constant current tube U3, precision operational-amplifier U4, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first capacitor C 1 and the second capacitor C 2, described current signal input end CJ2 connects capable of regulating constant current tube U3 and current signal output end JC1 simultaneously, between described current signal input end CJ2 and capable of regulating constant current tube U3, be provided with diode D1, described current signal input end CJ2 connects the positive pole of diode D1, capable of regulating constant current tube U3 connects the negative pole of diode D1, a lead-out terminal of described current signal output end JC1 connects one end of the second resistance R 2, the other end of the second resistance R 2 connects the positive input IN+ of precision operational-amplifier U4, another lead-out terminal of described current signal output end JC1 connects one end of the 3rd resistance R 3, the other end of the 3rd resistance R 3 connects the reverse input end IN-of precision operational-amplifier U4, two output terminals of described current signal output end JC1 be connected in parallel described the first resistance R 1 and the first capacitor C 1, one end of one end of described the first resistance R 1 and the first capacitor C 1 is connected with the second resistance R 2, and the other end of the other end of the first resistance R 1 and the first capacitor C 1 is connected with the first capacitor C 1, the output terminal OUT of described precision operational-amplifier U4 connects voltage signal output end CJ4 by the 4th resistance R 4, between described the 3rd resistance R 3 and the 4th resistance R 4, be provided with slide rheostat RP1 and the second capacitor C 2, described slide rheostat RP1 and the second capacitor C 2 parallel connections are connected across between described the 3rd resistance R 3 and the 4th resistance R 4.
Described capable of regulating constant current tube U3 is provided with adjustable resistance RP2, and described adjustable resistance RP2 is connected with capable of regulating constant current tube U3 by the 5th resistance R 5, is convenient to regulate capable of regulating constant current tube U3.
In the present invention, by capable of regulating constant current tube U3 and adjustable resistance RP2, make the first resistance R 1 obtain accurate 0V voltage signal to be:
Adjusting adjustable resistance RP2 is 0 with minimum current signal I1 at A point stack after-current by capable of regulating constant current tube U3 acquisition electric current I 2, thereby produces 0V signal in the first resistance R 1, finally by precision operational-amplifier U4 output 0V voltage.
When signal maximum (20mA) is inputted, the voltage signal obtaining after the stack of A point electric current is: (20-I2) this signal of X250 mV is delivered to the in-phase end of precision operational-amplifier U4, adjusting slide rheostat RP1, is 5V thereby adjustment enlargement factor makes precision operational-amplifier U4 output voltage.
The present invention is simple in structure, practicality is high, by the adjustable resistance RP2 on capable of regulating constant current tube U3 and capable of regulating constant current tube U3 is set, by regulating adjustable resistance RP2, obtain accurate 0V voltage signal output, by precision operational-amplifier U4 and slide rheostat RP1 are set, by regulating slide rheostat RP1 to make precision operational-amplifier U4 enlargement factor, obtain accurate 5V voltage signal output, accurately reliable, be adapted in WY type rolling bearing pressing machine control system the transformation applications as pressure sensor signal.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. a current signal converter circuit, comprise current signal input end CJ2, current signal output end JC1 and voltage signal output end CJ4, it is characterized in that, also comprise capable of regulating constant current tube U3, precision operational-amplifier U4, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first capacitor C 1 and the second capacitor C 2, described current signal input end CJ2 connects capable of regulating constant current tube U3 and current signal output end JC1 simultaneously, a lead-out terminal of described current signal output end JC1 connects one end of the second resistance R 2, the other end of the second resistance R 2 connects the positive input IN+ of precision operational-amplifier U4, another lead-out terminal of described current signal output end JC1 connects one end of the 3rd resistance R 3, the other end of the 3rd resistance R 3 connects the reverse input end IN-of precision operational-amplifier U4, two output terminals of described current signal output end JC1 be connected in parallel described the first resistance R 1 and the first capacitor C 1, one end of one end of described the first resistance R 1 and the first capacitor C 1 is connected with the second resistance R 2, and the other end of the other end of the first resistance R 1 and the first capacitor C 1 is connected with the first capacitor C 1, the output terminal OUT of described precision operational-amplifier U4 connects voltage signal output end CJ4 by the 4th resistance R 4, between described the 3rd resistance R 3 and the 4th resistance R 4, be provided with slide rheostat RP1 and the second capacitor C 2, described slide rheostat RP1 and the second capacitor C 2 parallel connections are connected across between described the 3rd resistance R 3 and the 4th resistance R 4.
2. a kind of current signal converter circuit according to claim 1, it is characterized in that, between described current signal input end CJ2 and capable of regulating constant current tube U3, be provided with diode D1, described current signal input end CJ2 connects the positive pole of diode D1, and capable of regulating constant current tube U3 connects the negative pole of diode D1.
3. a kind of current signal converter circuit according to claim 1, is characterized in that, described capable of regulating constant current tube U3 is provided with adjustable resistance RP2, and described adjustable resistance RP2 is connected with capable of regulating constant current tube U3 by the 5th resistance R 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310574963.8A CN103558894A (en) | 2013-11-18 | 2013-11-18 | Current signal converter circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310574963.8A CN103558894A (en) | 2013-11-18 | 2013-11-18 | Current signal converter circuit |
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| CN103558894A true CN103558894A (en) | 2014-02-05 |
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| CN201310574963.8A Pending CN103558894A (en) | 2013-11-18 | 2013-11-18 | Current signal converter circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644333A (en) * | 2016-07-15 | 2017-05-10 | 北京卫星环境工程研究所 | Large thrust vibration test system current monitoring converter |
| CN113572470A (en) * | 2021-08-24 | 2021-10-29 | 天津津航计算技术研究所 | 4-20mA conditioning circuit based on domestic discrete device |
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| CN2370424Y (en) * | 1999-03-26 | 2000-03-22 | 田逢春 | High precision two line system digit display meter |
| US20040090260A1 (en) * | 2002-06-28 | 2004-05-13 | Benoit Peron | Control of a thyristor of a rectifying bridge |
| CN101413864A (en) * | 2008-11-24 | 2009-04-22 | 北京联合大学 | Pulling and drawing type apparatus and method for measuring crude oil viscosity |
| EP2320547A2 (en) * | 2009-10-30 | 2011-05-11 | Hitachi Automotive Systems, Ltd. | Current-controlled semiconductor device and control unit using the same |
| CN203573196U (en) * | 2013-11-18 | 2014-04-30 | 铜陵科达车辆装备有限责任公司 | Current signal converter circuit |
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2013
- 2013-11-18 CN CN201310574963.8A patent/CN103558894A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2370424Y (en) * | 1999-03-26 | 2000-03-22 | 田逢春 | High precision two line system digit display meter |
| US20040090260A1 (en) * | 2002-06-28 | 2004-05-13 | Benoit Peron | Control of a thyristor of a rectifying bridge |
| CN101413864A (en) * | 2008-11-24 | 2009-04-22 | 北京联合大学 | Pulling and drawing type apparatus and method for measuring crude oil viscosity |
| EP2320547A2 (en) * | 2009-10-30 | 2011-05-11 | Hitachi Automotive Systems, Ltd. | Current-controlled semiconductor device and control unit using the same |
| CN203573196U (en) * | 2013-11-18 | 2014-04-30 | 铜陵科达车辆装备有限责任公司 | Current signal converter circuit |
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| 江雪山: "推荐一款4~20mA输入的I/V转换前置处理电路", 《家庭电子》, no. 12, 31 December 2005 (2005-12-31) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644333A (en) * | 2016-07-15 | 2017-05-10 | 北京卫星环境工程研究所 | Large thrust vibration test system current monitoring converter |
| CN113572470A (en) * | 2021-08-24 | 2021-10-29 | 天津津航计算技术研究所 | 4-20mA conditioning circuit based on domestic discrete device |
| CN113572470B (en) * | 2021-08-24 | 2024-03-26 | 天津津航计算技术研究所 | 4-20mA conditioning circuit based on domestic discrete device |
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Application publication date: 20140205 |