CN106055004A - Adjustable constant current source circuit - Google Patents
Adjustable constant current source circuit Download PDFInfo
- Publication number
- CN106055004A CN106055004A CN201610559630.1A CN201610559630A CN106055004A CN 106055004 A CN106055004 A CN 106055004A CN 201610559630 A CN201610559630 A CN 201610559630A CN 106055004 A CN106055004 A CN 106055004A
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- Prior art keywords
- field effect
- effect transistor
- circuit
- resistance
- adjustable constant
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Electrical Variables (AREA)
- Junction Field-Effect Transistors (AREA)
- Amplifiers (AREA)
Abstract
The invention relates to an adjustable constant current source circuit, which comprises a PWM (Pulse Width Modulation) generation circuit, a drive circuit and a field effect tube, wherein the output end of the PWM generation circuit is connected to the input end of the drive circuit; the output shaft of the drive circuit is connected to a grid of the field effect tube; and a drain electrode of the field effect tube is connected to a load. According to the adjustable constant current source circuit, an adjustable large current control element can be controlled.
Description
Technical field
The present invention relates to constant-current source circuit, particularly relate to a kind of adjustable constant flow source circuit.
Background technology
Constant-current source be not with load change in resistance, for load provide constant current power supply, its robot, LED drive,
Power communications etc. have application.At some control fields, the control signal of some element is electric current, and the size of input current controls
The duty that element is different, and, it is desirable to it is the biggest that input current reaches 1A.And electricity of typically its output of constant-current source circuit
Stream is tens milliamperes, and can not adjust, or output still its precision being capable of big electric current is the highest.
Summary of the invention
The technical problem to be solved is to provide a kind of adjustable constant flow source circuit, it is achieved to adjustable great current control
The control of element.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of adjustable constant flow source circuit, including PWM
Producing circuit, drive circuit and field effect transistor, described PWM produces the outfan of circuit and is connected with the input of drive circuit, institute
The grid of the outfan and field effect transistor of stating drive circuit is connected, and the drain electrode of described field effect transistor is connected with load.
Described PWM produces circuit and is used for producing unipolar pwm signal, and the dutycycle of described pwm signal can be carried out
Control to adjust.
Described drive circuit includes High voltage output buffer, photoelectrical coupler, the first resistance and the second resistance, described photoelectricity
Bonder is isolated form photoelectrical coupler, and the outfan that the input of described High voltage output buffer produces circuit with PWM is connected,
Outfan is connected with the input of isolated form photoelectrical coupler；The outfan of described isolated form photoelectrical coupler passes through the first resistance
With the second resistance eutral grounding；Node between described first resistance and the second resistance is connected with the grid of field effect transistor.
Described isolated form photoelectrical coupler uses ACPL-T350 chip, and the ANODE end of described ACPL-T350 chip is with high
The outfan of pressure output buffer is connected；The Vo end of described ACPL-T350 chip passes through the first resistance and the second resistance eutral grounding.
Described drive circuit includes High voltage output buffer, photoelectrical coupler, the first resistance and the second resistance, described photoelectricity
Bonder uses ACPL-T350 chip, the outfan that the input of described High voltage output buffer produces circuit with PWM to be connected,
Outfan is connected with the ANODE end of ACPL-T350 chip；The Vo end of described ACPL-T350 chip passes through the first resistance and second
Resistance eutral grounding；Node between described first resistance and the second resistance is connected with the grid of field effect transistor.
The two ends, left and right of described ACPL-T350 chip use different power supplys.
Described PWM produces and is additionally provided with a pull down resistor between circuit and High voltage output buffer.
Described field effect transistor is N-channel field effect transistor, the grid outputing signal to field effect transistor of described drive circuit；
The source ground of field effect transistor, and power supply connect with described load is altogether；The drain electrode of field effect transistor is connected with load one end, load
Another terminates positive supply.
Described field effect transistor is P-channel field-effect transistor (PEFT) pipe, the grid outputing signal to field effect transistor of described drive circuit；
The source electrode of field effect transistor connects positive supply；The drain electrode of field effect transistor is connected with load one end, loads other end ground connection.
The outfan of described field effect transistor is additionally provided with diode.
Beneficial effect
Owing to have employed above-mentioned technical scheme, the present invention compared with prior art, has the following advantages that and actively imitates
Really: the present invention is by the Duty ratio control to pwm signal, it is achieved the constant-current source circuit of output adjustable current size, present invention electricity
Road can be good with output linearity degree, and stability is high, the maximum big electric current up to several amperes.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the present invention；
Fig. 2 is the circuit diagram of embodiment of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is expanded on further.Should be understood that these embodiments are merely to illustrate the present invention
Rather than restriction the scope of the present invention.In addition, it is to be understood that after having read the content that the present invention lectures, people in the art
The present invention can be made various changes or modifications by member, and these equivalent form of values fall within the application appended claims equally and limited
Scope.
Embodiments of the present invention relate to a kind of adjustable constant flow source circuit, as it is shown in figure 1, include PWM produce circuit 101,
Drive circuit 102 and field effect transistor 103, described PWM produces the outfan of circuit 101 and is connected with the input of drive circuit 102,
The outfan of described drive circuit 102 is connected with the grid of field effect transistor 103, the drain electrode of described field effect transistor 103 and load 104
It is connected.Wherein, described PWM produces circuit and is used for producing unipolar pwm signal, and the dutycycle of described pwm signal can be entered
Row controls to adjust, and by the Duty ratio control to pwm signal, can realize exporting the adjustable purpose of size of current.
As in figure 2 it is shown, described drive circuit includes High voltage output buffer, photoelectrical coupler, the first resistance R2 and second
Resistance R5, described High voltage output buffer uses 7407 chips, and described photoelectrical coupler uses ACPL-T350 chip, described height
The outfan that the input of pressure output buffer produces circuit with PWM is connected, outfan and the ANODE end of ACPL-T350 chip
It is connected；Wherein, described PWM produces and is additionally provided with a pull down resistor R4, by under this between circuit and High voltage output buffer
Pull-up resistor R4 makes signal input for can be clearly zero during low level.The Vo end of described ACPL-T350 chip is by the first electricity
Resistance R2 and the second resistance R5 ground connection；The grid phase of the node between described first resistance R2 and the second resistance R5 and field effect transistor
Even.Wherein, described field effect transistor is N-channel field effect transistor, the source ground of field effect transistor, and power supply connect with described load
Altogether；The drain electrode of field effect transistor is connected with load one end, loads another termination positive supply.The outfan of described field effect transistor is also
Being provided with diode D1, this diode D1 can play a protective role.
It should be noted that the drive circuit in present embodiment can also is that the drive circuit of other forms, as long as its
It is capable of driving the purpose of field effect transistor.
It is noted that described field effect transistor can also be P-channel field-effect transistor (PEFT) pipe, when field effect transistor uses P-channel
During field effect transistor, the grid outputing signal to field effect transistor of described drive circuit；The source electrode of field effect transistor connects positive supply；Field effect
Should pipe drain electrode with load one end be connected, load other end ground connection.
In present embodiment, the pwm signal that pwm signal produces is unipolar pwm signal, and it exports Transistor-Transistor Logic level signal,
High level is positive voltage, and low level is 0V.ACPL-T350 chip drives element drives field effect as the field effect transistor of isolated form
Pipe, is using different power supplys (left end is VCC, and right-hand member is A20V) simultaneously around, the interference introduced at isolation load, improves
The stability of system.
Claims (9)
1. an adjustable constant flow source circuit, it is characterised in that include that PWM produces circuit, drive circuit and field effect transistor, described
PWM produces the outfan of circuit and is connected with the input of drive circuit, the outfan of described drive circuit and the grid of field effect transistor
The most connected, the drain electrode of described field effect transistor is connected with load.
Adjustable constant flow source circuit the most according to claim 1, it is characterised in that described PWM produces circuit and is used for producing list
The pwm signal of polarity, and the dutycycle of described pwm signal can be controlled adjust.
Adjustable constant flow source circuit the most according to claim 1, it is characterised in that described drive circuit includes that High voltage output delays
Rushing device, photoelectrical coupler, the first resistance and the second resistance, described photoelectrical coupler is isolated form photoelectrical coupler, described high pressure
The outfan that the input of output buffer produces circuit with PWM is connected, outfan and the input of isolated form photoelectrical coupler
It is connected；The outfan of described isolated form photoelectrical coupler passes through the first resistance and the second resistance eutral grounding；Described first resistance and
Node between two resistance is connected with the grid of field effect transistor.
Adjustable constant flow source circuit the most according to claim 3, it is characterised in that described isolated form photoelectrical coupler uses
ACPL-T350 chip, the ANODE end of described ACPL-T350 chip is connected with the outfan of High voltage output buffer；Described
The Vo end of ACPL-T350 chip passes through the first resistance and the second resistance eutral grounding.
Adjustable constant flow source circuit the most according to claim 4, it is characterised in that the left and right two of described ACPL-T350 chip
End uses different power supplys.
Adjustable constant flow source circuit the most according to claim 3, it is characterised in that described PWM produces circuit and High voltage output
A pull down resistor it is additionally provided with between buffer.
Adjustable constant flow source circuit the most according to claim 1, it is characterised in that described field effect transistor is N-channel field effect
Ying Guan, the grid outputing signal to field effect transistor of described drive circuit；The source ground of field effect transistor, and with described load institute
Connect power supply altogether；The drain electrode of field effect transistor is connected with load one end, loads another termination positive supply.
Adjustable constant flow source circuit the most according to claim 1, it is characterised in that described field effect transistor is P-channel field effect
Ying Guan, the grid outputing signal to field effect transistor of described drive circuit；The source electrode of field effect transistor connects positive supply；Field effect transistor
Drain and be connected with load one end, load other end ground connection.
Adjustable constant flow source circuit the most according to claim 1, it is characterised in that the outfan of described field effect transistor also sets
There is diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610559630.1A CN106055004B (en) | 2016-07-15 | 2016-07-15 | A kind of adjustable constant flow source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610559630.1A CN106055004B (en) | 2016-07-15 | 2016-07-15 | A kind of adjustable constant flow source circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106055004A true CN106055004A (en) | 2016-10-26 |
| CN106055004B CN106055004B (en) | 2018-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610559630.1A Active CN106055004B (en) | 2016-07-15 | 2016-07-15 | A kind of adjustable constant flow source circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580587A (en) * | 2020-05-22 | 2020-08-25 | 西安微电子技术研究所 | Pulse width modulation type constant current source circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009004529A2 (en) * | 2007-06-29 | 2009-01-08 | Philips Intellectual Property & Standards Gmbh | Synchronous self-driven power converter |
| CN104579261A (en) * | 2014-12-31 | 2015-04-29 | 深圳市航盛电子股份有限公司 | PWM signal isolation interlocking and drive amplifying circuit and motor controller |
| CN104766567A (en) * | 2015-03-18 | 2015-07-08 | 康佳集团股份有限公司 | LED backlight driving circuit and brightness regulating method of LED backlight |
| CN205880721U (en) * | 2016-07-15 | 2017-01-11 | 宁波帝洲自动化科技有限公司 | Adjustable constant current source circuit |
-
2016
- 2016-07-15 CN CN201610559630.1A patent/CN106055004B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009004529A2 (en) * | 2007-06-29 | 2009-01-08 | Philips Intellectual Property & Standards Gmbh | Synchronous self-driven power converter |
| CN104579261A (en) * | 2014-12-31 | 2015-04-29 | 深圳市航盛电子股份有限公司 | PWM signal isolation interlocking and drive amplifying circuit and motor controller |
| CN104766567A (en) * | 2015-03-18 | 2015-07-08 | 康佳集团股份有限公司 | LED backlight driving circuit and brightness regulating method of LED backlight |
| CN205880721U (en) * | 2016-07-15 | 2017-01-11 | 宁波帝洲自动化科技有限公司 | Adjustable constant current source circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580587A (en) * | 2020-05-22 | 2020-08-25 | 西安微电子技术研究所 | Pulse width modulation type constant current source circuit |
| CN111580587B (en) * | 2020-05-22 | 2021-12-21 | 西安微电子技术研究所 | Pulse width modulation type constant current source circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106055004B (en) | 2018-02-27 |
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