CN207249525U - A kind of controllable constant current source circuit - Google Patents
A kind of controllable constant current source circuit Download PDFInfo
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- CN207249525U CN207249525U CN201721357244.0U CN201721357244U CN207249525U CN 207249525 U CN207249525 U CN 207249525U CN 201721357244 U CN201721357244 U CN 201721357244U CN 207249525 U CN207249525 U CN 207249525U
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Abstract
The utility model provides a kind of controllable constant current source circuit, including DC input circuits, field-effect tube circuit, operation amplifier circuit, DA circuits, microprocessor circuit and DC output circuits；The DC input circuits input DC power, the Self-tuning System circuit formed via the field-effect tube circuit and the operation amplifier circuit, send to the DC output circuits, the DC output circuits and is connected with external device (ED), constant current is provided for it；The microprocessor circuit controls the DA circuits to provide reference voltage for the operation amplifier circuit.The utility model combines to form negative-feedback circuit control constant current by field-effect tube and operational amplifier, realize the linear regulation of electric current, current stability is good, it will not cause rapidly to change suddenly, improve security, can be by serial ports to microprocessor setting electric current size, it is easy to adjust, arrange parameter can be flexibly changed, current precision is high, provides convenience for intelligentized design.
Description
Technical field
Constant-current source circuit technical field is the utility model is related to, more particularly to a kind of controllable constant current source circuit.
Background technology
Constant-current source circuit is the basis for being capable of providing a stable electric current to ensure other circuit stability work.Constant-current source
Circuit is mainly made of input stage and output stage, and input stage provides reference current, and output stage exports the constant current needed, i.e.,
It is required that constant-current source circuit exports constant current.Existing constant-current source has two kinds, and a kind of is that the high-precision source table of import such as pacifies victory
The B2911A of human relations, 6166 of Advantest etc., another kind are the constant-current source circuits being built into various discrete or integrated chip.Import
Although high-precision source table precision it is high, stability is good, expensive, and volume is larger, it is not easy to is integrated into embedded system
In system；And the precision for the constant-current source circuit being built into various discrete or integrated chip, stability meet general operational requirement,
It is simple in structure, it is desirably integrated into embedded system.
The constant-current source circuit being built into the prior art with various discrete or integrated chip is increased at signal source circuit end
Current-limiting resistance goes to realize constant current purpose, its current value size is not easy to adjust, and the stability of electric current is by signal source voltage fluctuation shadow
Sound is larger, be easy to cause and rapidly changes, easily damage electrical part, security is poor.
Utility model content
(1) technical problem solved
To solve the above-mentioned problems, the utility model provides a kind of controllable constant current source circuit, the big minor adjustment side of current value
Just, and current precision is high, and stability is good.
(2) technical solution
A kind of controllable constant current source circuit, including DC input circuits, field-effect tube circuit, operation amplifier circuit, DA circuits,
Microprocessor circuit and DC output circuits；The DC input circuits input DC power, via the field-effect tube circuit and institute
The Self-tuning System circuit of operation amplifier circuit composition is stated, is sent to the DC output circuits, the DC output circuits and external device (ED)
It is connected, constant current is provided for it；The microprocessor circuit controls the DA circuits to be provided for the operation amplifier circuit
Reference voltage.
Further, the DC input circuits include DC power supply, the first connector, the first capacitance and the second capacitance.
Further, the field-effect tube circuit includes field-effect tube, first~3rd resistor, the 3rd capacitance and the 5th electricity
Hold.
Further, the operation amplifier circuit includes operational amplifier chip.
Further, the DA circuits include DA chips and the 4th capacitance.
Further, the DC output circuits include the second connector.
Further, the field-effect tube is the enhanced N-channel field-effect tube of insulated gate.
Further, the operational amplifier chip is 5pin OPA336NA model chips.
Further, the DA chips are 8pin AD5640BRJZ model chips.
(3) beneficial effect
The utility model provides a kind of controllable constant current source circuit, combined by field-effect tube and operational amplifier to be formed it is negative
Feedback circuit controls constant current, realizes the linear regulation of electric current, and current stability is good, will not cause rapidly to change suddenly,
Security is improved, can be easy to adjust by serial ports to microprocessor setting electric current size, arrange parameter can be flexibly changed, electricity
It is high to flow precision, provides convenience for intelligentized design, circuit cost is cheap, can be widely applied to signal light control, stabilizing magnetic field drives
The various occasions for needing constant current such as dynamic, power test.
Brief description of the drawings
Fig. 1 is a kind of flow chart of controllable constant current source circuit involved by the utility model.
Fig. 2 is a kind of schematic diagram of controllable constant current source circuit involved by the utility model.
Embodiment
The embodiment involved by the utility model is described in further details below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of controllable constant current source circuit, including DC input circuits, field-effect tube circuit, operational amplifier electricity
Road, DA circuits, microprocessor circuit and DC output circuits.
DC input circuit input DC powers, the Self-tuning System electricity formed via field-effect tube circuit and operation amplifier circuit
Road, send to DC output circuits, DC output circuits and is connected with external device (ED), constant current is provided for it；Microprocessor circuit controls
DA circuits provide reference voltage for operation amplifier circuit.
As shown in Fig. 2, DC input circuits include DC power supply, the first connector J1, capacitance C1 and capacitance C2.DC input electricity
Road, DC supply input, is whole constant-current source loop power supply.
Field-effect tube circuit includes field-effect tube Q1, resistance R1~R3, capacitance C3 and capacitance C5.Field-effect tube circuit, profit
DC output current controls are carried out with the voltage-controlled properties of flow of field-effect tube Q1.
Operation amplifier circuit includes operational amplifier chip U1,2 input terminals be coupled with DA chip U2 output terminals and
On feedback resistance R3, amplifier U1 output terminals are connected to the grid of field-effect tube Q1 by current-limiting resistance R1, by comparing 2 input terminals
Voltage adjust automatically output end voltage changes.
DA circuits include DA chips U2 and capacitance C4.DA circuits, by its output voltage size of microprocessor control, for fortune
Put U1 and reference voltage is provided, so as to control field-effect tube Q1 size of current.
Microprocessor circuit, and DA chips U2 communications, set DA chip U2 output voltage sizes.
DC output circuits include the second connector J2.DC output circuits, are connected to external device (ED), and constant electricity is provided for it
Stream.
It is big by microprocessor control DA circuit output voltages after input circuit and output circuit all normally connect
Small, DA chip U2 output terminals are connected to the noninverting input of amplifier U1, when amplifier U1 non-output voltages, field-effect tube Q1
Do not turn on, therefore the voltage at resistance R3 both ends is 0V, resistance R3 one end is connected to the reverse input end of amplifier U1, and amplifier U1 is being just at this time
Be more than reverse input end voltage, amplifier U1 output voltages to input terminal voltage, so as to start field-effect tube Q1, from input circuit to
Output circuit arrives resistance R3 and forms a current loop again, and when electric current is excessive, the voltage of resistance R3 one end increases, and feeds back to
The reverse input end of amplifier U1, when amplifier U1 reverse input ends voltage is more than noninverting input voltage, amplifier U1 stops output,
So as to which field-effect tube Q1 electric currents reduce, resistance R3 both end voltages and the voltage equivalent state of DA chips U2 outputs are finally reached, therefore
Output end current is invariable.
Field-effect tube Q1 is the enhanced N-channel field-effect tube of insulated gate.
Operational amplifier chip U1 is 5pin OPA336NA model chips.
DA chips U2 is 8pin AD5640BRJZ model chips.
The utility model provides a kind of controllable constant current source circuit, combined by field-effect tube and operational amplifier to be formed it is negative
Feedback circuit controls constant current, realizes the linear regulation of electric current, and current stability is good, will not cause rapidly to change suddenly,
Security is improved, can be easy to adjust by serial ports to microprocessor setting electric current size, arrange parameter can be flexibly changed, electricity
It is high to flow precision, provides convenience for intelligentized design, circuit cost is cheap, can be widely applied to signal light control, stabilizing magnetic field drives
The various occasions for needing constant current such as dynamic, power test.
Embodiment described above is only that the preferred embodiment of the utility model is described, not to this practicality
New spirit and scope are defined.Without departing from the design concept of the present utility model, ordinary people in the field couple
The all variations and modifications that the technical solution of the utility model is made, should fall within the protection scope of the present utility model, this reality
With new claimed technology contents, all record in detail in the claims.
Claims (9)
- A kind of 1. controllable constant current source circuit, it is characterised in that：Including DC input circuits, field-effect tube circuit, operational amplifier electricity Road, DA circuits, microprocessor circuit and DC output circuits；The DC input circuits input DC power, via the field-effect The Self-tuning System circuit of pipe circuit and operation amplifier circuit composition, send to the DC output circuits, the DC output circuits It is connected with external device (ED), constant current is provided for it；It is the operation amplifier that the microprocessor circuit, which controls the DA circuits, Device circuit provides reference voltage.
- A kind of 2. controllable constant current source circuit according to claim 1, it is characterised in that：The DC input circuits include direct current Power supply, the first connector, the first capacitance and the second capacitance.
- A kind of 3. controllable constant current source circuit according to claim 1, it is characterised in that：The field-effect tube circuit includes field Effect pipe, first~3rd resistor, the 3rd capacitance and the 5th capacitance.
- A kind of 4. controllable constant current source circuit according to claim 1, it is characterised in that：The operation amplifier circuit includes Operational amplifier chip.
- A kind of 5. controllable constant current source circuit according to claim 1, it is characterised in that：The DA circuits include DA chips and 4th capacitance.
- A kind of 6. controllable constant current source circuit according to claim 1, it is characterised in that：The DC output circuits include second Connector.
- A kind of 7. controllable constant current source circuit according to claim 3, it is characterised in that：The field-effect tube increases for insulated gate Strong type N-channel field-effect tube.
- A kind of 8. controllable constant current source circuit according to claim 4, it is characterised in that：The operational amplifier chip is 5pin OPA336NA model chips.
- A kind of 9. controllable constant current source circuit according to claim 5, it is characterised in that：The DA chips are 8pin AD5640BRJZ model chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721357244.0U CN207249525U (en) | 2017-10-20 | 2017-10-20 | A kind of controllable constant current source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721357244.0U CN207249525U (en) | 2017-10-20 | 2017-10-20 | A kind of controllable constant current source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207249525U true CN207249525U (en) | 2018-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721357244.0U Active CN207249525U (en) | 2017-10-20 | 2017-10-20 | A kind of controllable constant current source circuit |
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| Country | Link |
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| CN (1) | CN207249525U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007912A (en) * | 2018-10-05 | 2020-04-14 | 南京英特隆电子科技有限公司 | Voltage-controlled constant current source device |
| CN113050742A (en) * | 2021-03-11 | 2021-06-29 | 电子科技大学 | Precise constant current source circuit |
-
2017
- 2017-10-20 CN CN201721357244.0U patent/CN207249525U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007912A (en) * | 2018-10-05 | 2020-04-14 | 南京英特隆电子科技有限公司 | Voltage-controlled constant current source device |
| CN113050742A (en) * | 2021-03-11 | 2021-06-29 | 电子科技大学 | Precise constant current source circuit |
| CN113050742B (en) * | 2021-03-11 | 2022-07-29 | 电子科技大学 | Precise constant current source circuit |
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