CN201262716Y - Controllable 4-20mA current output circuit - Google Patents
Controllable 4-20mA current output circuit Download PDFInfo
- Publication number
- CN201262716Y CN201262716Y CNU2008201375813U CN200820137581U CN201262716Y CN 201262716 Y CN201262716 Y CN 201262716Y CN U2008201375813 U CNU2008201375813 U CN U2008201375813U CN 200820137581 U CN200820137581 U CN 200820137581U CN 201262716 Y CN201262716 Y CN 201262716Y
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- CN
- China
- Prior art keywords
- resistance
- triode
- output
- current output
- amplifier
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- Expired - Fee Related
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- Control Of Voltage And Current In General (AREA)
Abstract
The utility model relates to an electronic circuit, in particular to a controllable 4-20mA current output circuit. The output terminal of an operational amplifier is connected with one end of a resistance; two input terminals and a reverse-phase input terminal of the operational amplifier are connected with one end of the resistance and the emitting electrode of a triode; the identical-phase input terminal of the operational amplifier is a control terminal; the other end of the resistance is connected with the base electrode of the output triode; the collecting electrode of the triode is a current output terminal; the other end of the resistance is grounded; and one end of a capacitor is connected with the power terminal of the operational amplifier and the other end thereof is grounded. The electronic circuit has the advantages that the circuit has simple structure and the current has high output precision and good stability.
Description
Technical field
The utility model relates to a kind of electronic circuit, particularly relates to a kind of controlled 4-20mA current output circuit.
Background technology
At present, various Industry Control instrument great majority require band 4-20mA analog quantity output function, because present Market competition, requirement to the electronic product cost performance is more and more higher, understands by the individual, finds that the electric current output of most of instrument still realizes with the circuit of more complicated, circuit is complicated, used electronic component is many more, and the probability that breaks down will increase, and the price of product also can improve.Therefore the circuit of this complexity can not adapt to the research and development and the application of product.
Summary of the invention
The utility model provides a kind of circuit structure simple, electric current output accuracy height, and the controlled 4-20mA current output circuit of good stability, thus solve circuit complexity, defectives such as probability of failure height.
The technical solution adopted in the utility model is: the output of amplifier links to each other with an end of resistance, two input ends of amplifier, inverting input links to each other with an end of resistance and the emitter of triode, the in-phase input end of amplifier is a control end, the other end of resistance links to each other with the base stage of output triode, and the current collection of triode is current output terminal very, the other end ground connection of resistance, one end of electric capacity and the power end of amplifier are connected, the other end ground connection of electric capacity.
Advantage of the present utility model is:
1, circuit structure is simple, and the electric current output stability is good, and output accuracy is than higher;
2, can directly the controlling of amplifier, perhaps also can control by digital to analog converter with microprocessor with mimic channel;
3, introduce Current Negative Three-Point Capacitance in this circuit, stablize output current, when one timing of control voltage, output current can not change because of load variations;
4, this circuit has very application prospects.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Do description in more detail below in conjunction with 1 pair of the utility model of accompanying drawing: the output of amplifier 1 links to each other with an end of resistance 2, two input ends of amplifier 1, inverting input links to each other with an end of resistance 4 and the emitter of triode 3, the in-phase input end of amplifier 1 is a control end, the other end of resistance 2 links to each other with the base stage of output triode 3, and the current collection of triode 3 is current output terminal very, the other end ground connection of resistance 4, one end of electric capacity 5 and the power end of amplifier are connected, the other end ground connection of electric capacity 5.
Claims (1)
1, a kind of controlled 4-20mA current output circuit, it is characterized in that: the output of amplifier (1) links to each other with an end of resistance (2), two input ends of amplifier (1), inverting input links to each other with an end of resistance (4) and the emitter of triode (3), the in-phase input end of amplifier (1) is a control end, the other end of resistance (2) links to each other with the base stage of output triode (3), the current collection of triode (3) is current output terminal very, the other end ground connection of resistance (4), one end of electric capacity (5) and the power end of amplifier are connected, the other end ground connection of electric capacity (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201375813U CN201262716Y (en) | 2008-09-12 | 2008-09-12 | Controllable 4-20mA current output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201375813U CN201262716Y (en) | 2008-09-12 | 2008-09-12 | Controllable 4-20mA current output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201262716Y true CN201262716Y (en) | 2009-06-24 |
Family
ID=40809192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201375813U Expired - Fee Related CN201262716Y (en) | 2008-09-12 | 2008-09-12 | Controllable 4-20mA current output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201262716Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590589A (en) * | 2012-02-23 | 2012-07-18 | 河海大学 | 4-20mA current transmitter circuit |
| CN102789253A (en) * | 2011-05-18 | 2012-11-21 | 上海华建电力设备股份有限公司 | 4-20mA current output circuit controlled by PWM (pulse-width modulation) |
-
2008
- 2008-09-12 CN CNU2008201375813U patent/CN201262716Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789253A (en) * | 2011-05-18 | 2012-11-21 | 上海华建电力设备股份有限公司 | 4-20mA current output circuit controlled by PWM (pulse-width modulation) |
| CN102590589A (en) * | 2012-02-23 | 2012-07-18 | 河海大学 | 4-20mA current transmitter circuit |
| CN102590589B (en) * | 2012-02-23 | 2014-04-23 | 河海大学 | 4-20mA current transmitter circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090624 Termination date: 20110912 |