CN104460806A - Voltage and current signal conversion circuit - Google Patents
Voltage and current signal conversion circuit Download PDFInfo
- Publication number
- CN104460806A CN104460806A CN201410815330.6A CN201410815330A CN104460806A CN 104460806 A CN104460806 A CN 104460806A CN 201410815330 A CN201410815330 A CN 201410815330A CN 104460806 A CN104460806 A CN 104460806A
- Authority
- CN
- China
- Prior art keywords
- resistance
- voltage
- diode
- amplifier
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses a voltage and current signal conversion circuit. A single operational amplifier LM358 forms a low-cost, small-size and stable circuit converting 0-5V into 4-20MA. Firstly, the circuit is in output connection with an amplification circuit to amplify signals, namely enlarge the range, and conversion accuracy is increased. By means of a reference circuit, 4-20MA output accuracy is improved. By means of a feedback structure, deviation can be found out in time to carry out compensation. A filter circuit is arranged externally to eliminate effect of an anti-interference source. The output protection function can be achieved by means of a fuse protector at the output end.
Description
Technical field
The present invention relates to central air conditioner control field, specifically a kind of voltage and current signal change-over circuit.
Background technology
In central air conditioner system, cooling system is related to the work efficiency of refrigeration host computer, how to convert 0-5V voltage command signal to 4-20mA current signal fast and accurately, thus make performer accurately to identify and to perform instruction, become a key point of cooling system efficiency.The components and parts adopted due to current change-over circuit are more, and not only slewing rate is affected, and cost is also corresponding to be increased.
Summary of the invention
The invention provides a kind of voltage and current signal change-over circuit, can be reduced cost, improve stability and efficiency.
The present invention is by the following technical solutions: voltage and current signal change-over circuit, comprise resistance R19, resistance R19 mono-termination 0-5V voltage signal, the resistance R19 other end is connecting resistance R21 one end respectively, amplifier LM358 second pin, amplifier LM358 the 3rd pin is by resistance R20 ground connection, the resistance R21 other end connects amplifier LM358 first pin by slide rheostat R22, amplifier LM358 first pin connects amplifier LM358 the 6th pin by resistance R23, amplifier LM358 the 8th pin connects 12V voltage, amplifier LM358 the 5th pin is by resistance R25 ground connection, amplifier LM358 the 5th pin connects diode D9 negative pole by resistance R24, diode D9 plus earth, amplifier LM358 the 6th pin is connecting resistance R30 one end respectively, resistance R28 one end, the resistance R28 other end connects triode Q1 emitter by slide rheostat R29, the resistance R30 other end is connecting resistance R32 one end respectively, slide rheostat R31 one end, voltage stabilizing diode D12 positive pole, another termination 12V voltage of resistance R32, the slide rheostat R31 other end and the equal ground connection of voltage stabilizing diode D12 negative pole, amplifier LM358 the 7th pin connects triode Q1 base stage by resistance R26, triode Q1 collector connects 12V voltage, triode Q1 emitter connects diode D10 positive pole respectively, resistance R27 one end, diode D10 negative pole connects triode Q1 base stage, the resistance R27 other end connects diode D9 negative pole and diode D11 positive pole respectively, diode D11 negative pole connects 4-20mA current signal output end by fuse.
Preferably, diode D9 model is 1N1588.
Preferably, the model of diode D10 is 1N4007.
Preferably, the fusing current of fuse is 100mA.
The invention has the beneficial effects as follows: adopt the low cost that amplifier LM358 is formed, small size, 0 stable ~ 5V turn 4 ~ 20MA circuit.First export and connect amplifying circuit, realize the amplification to signal, i.e. range extension, improve conversion accuracy simultaneously.Adopt and reference circuit, improve the precision of output 4 ~ 20MA.Adopt reaction type structure, Timeliness coverage deviation compensates.External filtering circuit, eliminates the impact of anti-interference source in time.Utilize the fuse of output terminal, achieve output protecting function.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Voltage and current signal change-over circuit as shown in Figure 1, comprise resistance R19, resistance R19 mono-termination 0-5V voltage signal, the resistance R19 other end is connecting resistance R21 one end respectively, amplifier LM358 second pin, amplifier LM358 the 3rd pin is by resistance R20 ground connection, the resistance R21 other end connects amplifier LM358 first pin by slide rheostat R22, amplifier LM358 first pin connects amplifier LM358 the 6th pin by resistance R23, amplifier LM358 the 8th pin connects 12V voltage, amplifier LM358 the 5th pin is by resistance R25 ground connection, amplifier LM358 the 5th pin connects diode D9 negative pole by resistance R24, diode D9 plus earth, amplifier LM358 the 6th pin is connecting resistance R30 one end respectively, resistance R28 one end, the resistance R28 other end connects triode Q1 emitter by slide rheostat R29, the resistance R30 other end is connecting resistance R32 one end respectively, slide rheostat R31 one end, voltage stabilizing diode D12 positive pole, another termination 12V voltage of resistance R32, the slide rheostat R31 other end and the equal ground connection of voltage stabilizing diode D12 negative pole, amplifier LM358 the 7th pin connects triode Q1 base stage by resistance R26, triode Q1 collector connects 12V voltage, triode Q1 emitter connects diode D10 positive pole respectively, resistance R27 one end, diode D10 negative pole connects triode Q1 base stage, the resistance R27 other end connects diode D9 negative pole and diode D11 positive pole respectively, diode D11 negative pole connects 4-20mA current signal by fuse.Diode D9 model is 1N1588, and the model of diode D10 is 1N4007, and the fusing current of fuse is 100mA.
Except structure of the present invention, all the other are prior art.
The above is the preferred embodiment of the present invention, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also regarded as protection scope of the present invention.
Claims (4)
1. voltage and current signal change-over circuit, it is characterized in that, comprise resistance R19, resistance R19 mono-termination 0-5V voltage signal, the resistance R19 other end is connecting resistance R21 one end respectively, amplifier LM358 second pin, amplifier LM358 the 3rd pin is by resistance R20 ground connection, the resistance R21 other end connects amplifier LM358 first pin by slide rheostat R22, amplifier LM358 first pin connects amplifier LM358 the 6th pin by resistance R23, amplifier LM358 the 8th pin connects 12V voltage, amplifier LM358 the 5th pin is by resistance R25 ground connection, amplifier LM358 the 5th pin connects diode D9 negative pole by resistance R24, diode D9 plus earth, amplifier LM358 the 6th pin is connecting resistance R30 one end respectively, resistance R28 one end, the resistance R28 other end connects triode Q1 emitter by slide rheostat R29, the resistance R30 other end is connecting resistance R32 one end respectively, slide rheostat R31 one end, voltage stabilizing diode D12 positive pole, another termination 12V voltage of resistance R32, the slide rheostat R31 other end and the equal ground connection of voltage stabilizing diode D12 negative pole, amplifier LM358 the 7th pin connects triode Q1 base stage by resistance R26, triode Q1 collector connects 12V voltage, triode Q1 emitter connects diode D10 positive pole respectively, resistance R27 one end, diode D10 negative pole connects triode Q1 base stage, the resistance R27 other end connects diode D9 negative pole and diode D11 positive pole respectively, diode D11 negative pole connects 4-20mA current signal output end by fuse.
2. voltage and current signal change-over circuit according to claim 1, is characterized in that, diode D9 model is 1N1588.
3. voltage and current signal change-over circuit according to claim 1, is characterized in that, the model of diode D10 is 1N4007.
4. voltage and current signal change-over circuit according to claim 1, is characterized in that, the fusing current of fuse is 100mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815330.6A CN104460806A (en) | 2014-12-25 | 2014-12-25 | Voltage and current signal conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815330.6A CN104460806A (en) | 2014-12-25 | 2014-12-25 | Voltage and current signal conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104460806A true CN104460806A (en) | 2015-03-25 |
Family
ID=52907023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410815330.6A Pending CN104460806A (en) | 2014-12-25 | 2014-12-25 | Voltage and current signal conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104460806A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110058630A (en) * | 2018-01-18 | 2019-07-26 | 大唐移动通信设备有限公司 | A kind of voltage current transformating circuit |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070015238A (en) * | 2007-01-12 | 2007-02-01 | 이경순 | Main current detection and analysis recurrence system |
| US20080031304A1 (en) * | 2006-08-02 | 2008-02-07 | Nec Electronics Corporation | Temperature detection circuit and semiconductor device |
| CN201359620Y (en) * | 2008-12-26 | 2009-12-09 | 广州擎天实业有限公司 | High-insulation rotor voltage and current transformer |
| CN201622146U (en) * | 2010-03-12 | 2010-11-03 | 淄博飞雁先行测控技术有限公司 | Low power consumption two-wire system 4-20mA output pressure transmitter circuit |
| CN102035546A (en) * | 2010-12-04 | 2011-04-27 | 中国北车股份有限公司大连电力牵引研发中心 | Voltage current transformer |
| CN102879018A (en) * | 2012-09-18 | 2013-01-16 | 杭州电子科技大学 | Platinum resistance and analogous current transducing circuit |
| CN204347671U (en) * | 2014-12-25 | 2015-05-20 | 李钢 | Voltage and current signal change-over circuit |
-
2014
- 2014-12-25 CN CN201410815330.6A patent/CN104460806A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080031304A1 (en) * | 2006-08-02 | 2008-02-07 | Nec Electronics Corporation | Temperature detection circuit and semiconductor device |
| KR20070015238A (en) * | 2007-01-12 | 2007-02-01 | 이경순 | Main current detection and analysis recurrence system |
| CN201359620Y (en) * | 2008-12-26 | 2009-12-09 | 广州擎天实业有限公司 | High-insulation rotor voltage and current transformer |
| CN201622146U (en) * | 2010-03-12 | 2010-11-03 | 淄博飞雁先行测控技术有限公司 | Low power consumption two-wire system 4-20mA output pressure transmitter circuit |
| CN102035546A (en) * | 2010-12-04 | 2011-04-27 | 中国北车股份有限公司大连电力牵引研发中心 | Voltage current transformer |
| CN102879018A (en) * | 2012-09-18 | 2013-01-16 | 杭州电子科技大学 | Platinum resistance and analogous current transducing circuit |
| CN204347671U (en) * | 2014-12-25 | 2015-05-20 | 李钢 | Voltage and current signal change-over circuit |
Non-Patent Citations (2)
| Title |
|---|
| 柏受军 等: ""LVDY位移传感器电压电流转换电路的设计"", 《传感器与微系统》 * |
| 王正德 等: ""工业用4/20mA两线制变送器的设计"", 《仪表技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110058630A (en) * | 2018-01-18 | 2019-07-26 | 大唐移动通信设备有限公司 | A kind of voltage current transformating circuit |
| CN110058630B (en) * | 2018-01-18 | 2021-06-11 | 大唐移动通信设备有限公司 | Voltage-current conversion circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204391679U (en) | A kind of leakage current detection protection circuit | |
| CN204347671U (en) | Voltage and current signal change-over circuit | |
| CN104460806A (en) | Voltage and current signal conversion circuit | |
| CN205911742U (en) | Electrical resolver excitation output current -limiting protection circuit | |
| CN204634032U (en) | A kind of earpiece data transport module and data source | |
| CN205178996U (en) | Audio signal amplifier circuit | |
| CN105486330A (en) | Excitation and output signal conditioning circuit of rotary encoder | |
| CN203312785U (en) | Lightning protection circuit of telemetry terminal machine | |
| CN204631669U (en) | A kind of rate signal modulate circuit | |
| CN204241913U (en) | A kind of weather station control circuit | |
| CN210053205U (en) | Overload protection circuit for rotary transformer excitation signal | |
| CN203434609U (en) | Current protection circuit of servo driver | |
| CN202602604U (en) | Reset circuit used for servo motor system | |
| CN203466727U (en) | Miniwatt voltage stabilizing source circuit | |
| CN204595664U (en) | A kind of high-precision low cost current-source arrangement | |
| CN204316738U (en) | Based on phase shift process from gain wide region audio frequency processing system | |
| CN203225710U (en) | Integrated fully-differential amplifier | |
| CN204346465U (en) | Mining Multiple typed sensor signal transmitting circuit | |
| CN102843080A (en) | Stepping motor drive circuit | |
| CN204214467U (en) | A kind of excitation of rotary encoder and output signal conditioning circuit | |
| CN204013222U (en) | Common cathode direct current transmission circuit | |
| CN107917770A (en) | Possesses the road foundation pressure-detecting device of long distance transmission and anti-interference function | |
| CN104482947B (en) | Mining Multiple typed sensor signal transmitting circuit | |
| CN203323791U (en) | Integrated sensor | |
| CN204256445U (en) | Prevent the steady-state circuit system outputing signal sideslip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150325 |