CN106055004B - A kind of adjustable constant flow source circuit - Google Patents
A kind of adjustable constant flow source circuit Download PDFInfo
- Publication number
- CN106055004B CN106055004B CN201610559630.1A CN201610559630A CN106055004B CN 106055004 B CN106055004 B CN 106055004B CN 201610559630 A CN201610559630 A CN 201610559630A CN 106055004 B CN106055004 B CN 106055004B
- Authority
- CN
- China
- Prior art keywords
- fet
- output end
- drive circuit
- constant flow
- adjustable constant
- 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.)
- Active
Links
Classifications
-
- 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
Landscapes
- 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 present invention relates to a kind of adjustable constant flow source circuit, including PWM generation circuits, drive circuit and FET, the output end of the PWM generation circuits is connected with the input of drive circuit, the output end of the drive circuit is connected with the grid of FET, and the drain electrode of the FET is connected with load.The present invention realizes the control to adjustable great current control element.
Description
Technical field
The present invention relates to constant-current source circuit, more particularly to a kind of adjustable constant flow source circuit.
Background technology
Constant-current source is not provide the power supply of constant current with load change in resistance, for load, it is in robot, LED drives,
Power communication etc. has application.In some control fields, the control signal of some elements is electric current, and the size of input current controls
The different working condition of element, and, it is desirable to it is even more big that input current reaches 1A.And the electricity of general its output of constant-current source circuit
Flow for tens milliamperes, and can not adjust, or can realize high current output but its precision it is but not high.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of adjustable constant flow source circuit, realize and adjustable great current is controlled
The control of element.
The technical solution adopted for the present invention to solve the technical problems is：A kind of adjustable constant flow source circuit, including PWM are provided
Generation circuit, drive circuit and FET, the output end of the PWM generation circuits are connected with the input of drive circuit, institute
State the output end of drive circuit with the grid of FET to be connected, the drain electrode of the FET is connected with load.
The PWM generation circuits are used to produce unipolar pwm signal, and the dutycycle of the pwm signal can be carried out
Control adjustment.
The drive circuit includes High voltage output buffer, photoelectrical coupler, first resistor and second resistance, the photoelectricity
Coupler is isolated form photoelectrical coupler, and the input of the High voltage output buffer is connected with the output end of PWM generation circuits,
Output end is connected with the input of isolated form photoelectrical coupler；The output end of the isolated form photoelectrical coupler passes through first resistor
It is grounded with second resistance；Node between the first resistor and second resistance is connected with the grid of FET.
The isolated form photoelectrical coupler uses ACPL-T350 chips, ANODE ends and the height of the ACPL-T350 chips
The output end of pressure output buffer is connected；The Vo ends of the ACPL-T350 chips are grounded by first resistor and second resistance.
The drive circuit includes High voltage output buffer, photoelectrical coupler, first resistor and second resistance, the photoelectricity
Coupler uses ACPL-T350 chips, and the input of the High voltage output buffer is connected with the output end of PWM generation circuits,
Output end is connected with the ANODE ends of ACPL-T350 chips；The Vo ends of the ACPL-T350 chips pass through first resistor and second
Resistance eutral grounding；Node between the first resistor and second resistance is connected with the grid of FET.
The left and right ends of the ACPL-T350 chips use different power supplys.
A pull down resistor is additionally provided between the PWM generation circuits and High voltage output buffer.
Described FET is N-channel FET, the grid for outputing signal to FET of the drive circuit；
The source ground of FET, and connect power supply altogether with the load；The drain electrode of FET is connected with load one end, loads
Another termination positive supply.
Described FET is P-channel field-effect transistor (PEFT) pipe, the grid for outputing signal to FET of the drive circuit；
The source electrode of FET connects positive supply；The drain electrode of FET is connected with load one end, load other end ground connection.
The output end of described FET is additionally provided with diode.
Beneficial effect
As a result of above-mentioned technical scheme, the present invention compared with prior art, has the following advantages that and actively imitated
Fruit：The present invention realizes the constant-current source circuit for exporting adjustable current size, present invention electricity by the Duty ratio control to pwm signal
Road can be good with output linearity degree, and stability is high, maximum reachable several amperes high current.
Brief description of the drawings
Fig. 1 is the structured flowchart of the present invention；
Fig. 2 is the circuit diagram of embodiment of the present invention.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.In addition, it is to be understood that after the content of the invention lectured has been read, people in the art
Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Scope.
Embodiments of the present invention are related to a kind of adjustable constant flow source circuit, as shown in figure 1, including PWM generation circuits 101,
Drive circuit 102 and FET 103, the output end of the PWM generation circuits 101 are connected with the input of drive circuit 102,
The output end of the drive circuit 102 is connected with the grid of FET 103, drain electrode and the load 104 of the FET 103
It is connected.Wherein, the PWM generation circuits are used to produce unipolar pwm signal, and the dutycycle of the pwm signal can be entered
Row control adjustment, by the Duty ratio control to pwm signal, can be achieved the adjustable purpose of output current size.
As shown in Fig. 2 the drive circuit includes High voltage output buffer, photoelectrical coupler, first resistor R2 and second
Resistance R5, the High voltage output buffer use 7407 chips, and the photoelectrical coupler uses ACPL-T350 chips, the height
The input of pressure output buffer is connected with the output end of PWM generation circuits, output end and the ANODE ends of ACPL-T350 chips
It is connected；Wherein, a pull down resistor R4 is additionally provided between the PWM generation circuits and High voltage output buffer, by under this
Pull-up resistor R4 is clearly zero when enabling signal input to be low level.The Vo ends of the ACPL-T350 chips pass through the first electricity
Hinder R2 and second resistance R5 ground connection；The grid phase of node and FET between the first resistor R2 and second resistance R5
Even.Wherein, described FET is N-channel FET, the source ground of FET, and connects power supply with the load
Altogether；The drain electrode of FET is connected with load one end, loads another termination positive supply.The output end of described FET is also
Provided with diode D1, diode D1 can play a protective role.
It should be noted that the drive circuit in present embodiment can also be the drive circuit of other forms, as long as its
The purpose of driving FET can be realized.
It is noted that described FET can also be P-channel field-effect transistor (PEFT) pipe, when FET uses P-channel
During FET, the grid for outputing signal to FET of the drive circuit；The source electrode of FET connects positive supply；Field effect
Should pipe drain electrode with load one end be connected, load the other end ground connection.
In present embodiment, pwm signal caused by pwm signal is unipolar pwm signal, and it exports Transistor-Transistor Logic level signal,
High level is positive voltage, low level 0V.ACPL-T350 chips drive field-effect as the FET driving element of isolated form
Pipe, while different power supplys (left end VCC, right-hand member A20V) is used in its left and right, isolate the interference introduced at load, improve
The stability of system.
Claims (6)
1. a kind of adjustable constant flow source circuit, it is characterised in that described including PWM generation circuits, drive circuit and FET
The output end of PWM generation circuits is connected with the input of drive circuit, the output end of the drive circuit and the grid of FET
Extremely it is connected, the drain electrode of the FET is connected with load；The drive circuit includes High voltage output buffer, photoelectric coupling
Device, first resistor and second resistance, the photoelectrical coupler are isolated form photoelectrical coupler, the High voltage output buffer it is defeated
Enter end with the output end of PWM generation circuits to be connected, output end is connected with the input of isolated form photoelectrical coupler；The isolated form
The output end of photoelectrical coupler is grounded by first resistor and second resistance；Node between the first resistor and second resistance
It is connected with the grid of FET；The isolated form photoelectrical coupler uses ACPL-T350 chips, the ACPL-T350 chips
ANODE ends be connected with the output end of High voltage output buffer；The Vo ends of the ACPL-T350 chips pass through first resistor and
Two resistance eutral groundings；The left and right ends of the ACPL-T350 chips use different power supplys.
2. adjustable constant flow source circuit according to claim 1, it is characterised in that the PWM generation circuits are used to produce list
The pwm signal of polarity, and the dutycycle of the pwm signal can be controlled adjustment.
3. adjustable constant flow source circuit according to claim 1, it is characterised in that the PWM generation circuits and High voltage output
A pull down resistor is additionally provided between buffer.
4. adjustable constant flow source circuit according to claim 1, it is characterised in that described FET is imitated for N-channel field
Ying Guan, the grid for outputing signal to FET of the drive circuit；The source ground of FET, and with the load institute
Connect power supply altogether；The drain electrode of FET is connected with load one end, loads another termination positive supply.
5. adjustable constant flow source circuit according to claim 1, it is characterised in that described FET is imitated for P-channel field
Ying Guan, the grid for outputing signal to FET of the drive circuit；The source electrode of FET connects positive supply；FET
Drain electrode is connected with load one end, load other end ground connection.
6. adjustable constant flow source circuit according to claim 1, it is characterised in that the output end of described FET is also set
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 CN106055004A (en) | 2016-10-26 |
| CN106055004B true CN106055004B (en) | 2018-02-27 |
Family
ID=57187663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610559630.1A Active CN106055004B (en) | 2016-07-15 | 2016-07-15 | A kind of adjustable constant flow source circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106055004B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (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
Also Published As
| Publication number | Publication date |
|---|---|
| CN106055004A (en) | 2016-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103825461B (en) | With the closely-controlled drive circuit to grid voltage | |
| CN105549673B (en) | Dual-mode switching type LDO circuit | |
| CN204886405U (en) | Dual-power isolation circuit | |
| CN104795976B (en) | The method for designing of the drive control circuit of PMOS switch pipe can be rapidly switched off | |
| CN108075737A (en) | For driving the low output impedance of capacity load, high speed and high pressure voltage generator | |
| CN102005941B (en) | Piezoelectric ceramics driving power supply for adjusting numerical control potentiometer | |
| CN104979813B (en) | A kind of current-limiting protection circuit | |
| CN106774580A (en) | A kind of LDO circuit of fast transient response high PSRR | |
| CN105940609A (en) | Buffer circuits and methods | |
| CN106505526B (en) | One kind being used for motor-driven high-end over-current protection circuit topological structure | |
| CN103874296A (en) | LED constant-current driving circuit of multi-path self-adaptive loads | |
| CN105700598A (en) | Fold-back current limiting circuit for voltage stabilizer | |
| CN1266838C (en) | Semiconductor integrated circuit device capable of generating stably constant current under low power voltage | |
| CN107241018A (en) | A kind of Width funtion input turns low-voltage high-power output circuit and method | |
| CN102722209A (en) | Constant current source circuit | |
| CN202372918U (en) | Fault isolation circuit | |
| CN106055004B (en) | A kind of adjustable constant flow source circuit | |
| CN207397837U (en) | A kind of control circuit for electromagnet | |
| CN205880721U (en) | Adjustable constant current source circuit | |
| CN102395234B (en) | Low voltage CMOS constant current source circuit with high matching degree | |
| CN104716936B (en) | A kind of signal demodulation integrated circuit of anti-ESD | |
| CN208285214U (en) | A kind of stagnant ring driving device of low-power consumption | |
| CN203884027U (en) | LED constant current driving circuit for multipath adaptive load | |
| CN104868721A (en) | Step-down power conversion circuit and system thereof | |
| CN104901540B (en) | Switching mode DC power supply changeover device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |