CN207083248U - A kind of LED voltage dimming driving circuit - Google Patents
A kind of LED voltage dimming driving circuit Download PDFInfo
- Publication number
- CN207083248U CN207083248U CN201720299449.1U CN201720299449U CN207083248U CN 207083248 U CN207083248 U CN 207083248U CN 201720299449 U CN201720299449 U CN 201720299449U CN 207083248 U CN207083248 U CN 207083248U
- Authority
- CN
- China
- Prior art keywords
- circuit
- sub
- dimming driving
- output
- resistance
- 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.)
- Expired - Fee Related
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a kind of LED voltage dimming driving circuit, including input circuit (1), control circuit (2), output circuit (3)；The input circuit (1), control circuit (2), output circuit (3) are sequentially connected electrically；Also include regulating circuit (4), the regulating circuit (4) is connected with the control circuit (2), output circuit (3), for adjusting output voltage.When connecting LED using LED voltage dimming driving circuit of the present utility model, the value of output voltage can be adjusted by adjusting the resistance of potentiometer, so as to realize the regulation of LED luminance.
Description
Technical field
The utility model belongs to electronic circuit field, and in particular to a kind of LED voltage dimming driving circuit.
Background technology
LED is semiconductor light-emitting-diode, is a kind of solid state semiconductor devices, and electricity directly can be converted into light by it.
LED electricity-saving lamps are to use high brightness white light-emitting diode light emitting source, and light efficiency is high, little power consumption, long lifespan, easy to control, non-maintaining, peace
Loopful is protected；It is solid cold light source of new generation, soft color, gorgeous, rich and varied, low-loss, low energy consumption are green, are applicable
Family, market, bank, hospital, hotel, other various public places of restaurant illuminate for a long time.Without direct current is dodged, eyes are played
Good protective effect, is desk lamp, the optimal selection of torch.
But existing LED drive circuit is fixed output voltage at present, it is impossible to changes or is adjusted.Same
Light fixture in use, being made troubles when needing voltage being adjusted to user, it is impossible to voltage is adjusted, so as to can not
Change LED brightness.
Utility model content
The utility model provides a kind of LED voltage dimming driving circuit for the above technological deficiency of prior art, adjusts
Nodal potential device VR resistance value changes output voltage, adjusts LED brightness so as to adjust output voltage.
The purpose of this utility model is achieved through the following technical solutions：
A kind of LED voltage dimming driving circuit, including input circuit 1, control circuit 2, output circuit 3；The input electricity
Road 1, control circuit 2, output circuit 3 are sequentially connected electrically；Also include regulating circuit 4, the regulating circuit 4 and the control circuit
2nd, output circuit 3 connects, for adjusting output voltage.
Preferably, the regulating circuit 4 includes three terminal regulator sub-circuit 401 and resistance trimming sub-circuit 402；Three end is steady
Depressor sub-circuit 401 is connected with resistance trimming sub-circuit 402.
Preferably, the resistance trimming sub-circuit 402 includes divider resistance and potentiometer；The divider resistance and potentiometer string
Connection.
Preferably, the three terminal regulator sub-circuit 401 is the sub-circuit of three terminal regulator TL431 controls.
Preferably, the control circuit 2 includes IC control sub-circuits 201 and photoelectrical coupler 202；The photoelectrical coupler
202 are connected with IC controls sub-circuit 201, output circuit 3, regulating circuit 4.
Preferably, the IC controls sub-circuit 201 is the sub-circuit of chip MT6239 controls.
Preferably, the photoelectrical coupler 202 is PC817B photoelectrical couplers.
Preferably, the output circuit 3 includes the filtering sub-circuit 302 of transformation sub-circuit 301 and first；The transformation electricity
Road 301 is connected with the first filtering sub-circuit 302.
Preferably, the input circuit 1 includes the filtering sub-circuit 102 of rectifier bridge 101 and second；The rectifier bridge 101 with
Second filtering sub-circuit 102 is connected.
Compared with prior art, the utility model LED voltage dimming driving circuit at least has the advantages that：
The divider resistance and potentiometer set in regulating circuit is used for adjusting resistance value, and the voltage at resistance both ends and three ends are steady
The reference voltage of depressor compares；When the voltage at resistance both ends is more than the reference voltage of three terminal regulator, regulating circuit is by photoelectricity
Coupler is turned on, and then control circuit and output circuit are no longer powered.If divider resistance and the voltage at potentiometer both ends are less than
During the reference voltage of three terminal regulator, photoelectrical coupler disconnects, and control circuit and output circuit export corresponding voltage, and electricity
Pressure can rise always；Until output voltage rises to certain value, the voltage at corresponding divider resistance and potentiometer both ends is more than three
When holding reference voltage of regulator, three terminal regulator turns on photoelectrical coupler, and control circuit and output circuit are no longer powered.Such as
This circulation, make the voltage stabilization of output end；Change the resistance value of divider resistance and potentiometer, so as to change output voltage, reach
Dimming effect.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the utility model LED voltage dimming driving circuit.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples, following examples be it is descriptive,
It is not limited, it is impossible to which the scope of protection of the utility model is limited with this.
Make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is this
Invention part of the embodiment, rather than whole embodiments.Embodiments of the present invention, which are generally described and illustrated herein in the accompanying drawings
Component can arrange and design with a variety of configurations.Therefore, the implementation of the invention to providing in the accompanying drawings below
The detailed description of example is not intended to limit the scope of claimed invention, but is merely representative of the selected implementation of the present invention
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belongs to the scope of protection of the invention.
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
The utility model is illustrated with reference to Fig. 1.As shown in figure 1, it is the utility model LED voltage dimming driving circuit
Schematic diagram, mainly include input circuit 1, control circuit 2, output circuit 3 and regulating circuit 4.Wherein：
Input circuit 1 is used for input voltage, is powered for circuit.Input circuit 1 includes the filtering son electricity of rectifier bridge 101 and second
Road 102；Rectifier bridge 101 is used for input voltage carrying out rectification, and the second filtering sub-circuit 102 is used for will be whole by rectifier bridge 101
Voltage after stream is filtered processing.Rectifier bridge 101 is ABS8 rectifier bridges in the present embodiment, and rectifier bridge 101 connects civil power, then
Exported after civil power is carried out into rectification to the second filtering sub-circuit 102.Second filtering sub-circuit 102 includes electrochemical capacitor C1, electrolysis
Electric capacity C2 and common mode inductance LF1；The output end of electrochemical capacitor C1 both ends connection rectifier bridge 101, common mode inductance LF1 one 0 ends
It is connected with electrochemical capacitor C1 both ends, electrochemical capacitor C2 both ends are connected with the common mode inductance LF1 other end.In addition, input electricity
Road 1 also includes fuse FUL, and fuse FUL is used for protection circuit, and when current is excessive, fuse burns disconnection, prevents other
Circuit is burned out.
Input circuit 1, control circuit 2 and output circuit 3 are sequentially connected, and control circuit 2 includes the IC control Hes of sub-circuit 201
Photoelectrical coupler 202.
IC control sub-circuits 201 are the sub-circuit of chip MT6239 controls, and chip MT6239 includes FB pins 1, OVP pins
2nd, VDD pins 3, SENSE pins 4, GND pin 8, GND pin 7, Drain pins 6 and Drain pins 5；Eight pins connect respectively
Connect different components and then control corresponding circuit work.Two GND pins are connected with electrochemical capacitor C2；It is electric capacity C5, steady
Pressure pipe Z1, resistance R3, resistance R4 and electrochemical capacitor C3 are connected the circuit to be formed with IC and are used for being used for IC power supplies to IC power supplies
Circuit.IC controls sub-circuit 201 also includes starting resistance R1 and starts resistance R2, starts resistance and is used for starting IC.
The output end of photoelectrical coupler 202 (being 202 in this figure) controls sub-circuit 201 to be connected with IC；Photoelectrical coupler 202
Output end and IC control sub-circuit 201 chips MT6239 FB pins 1, GND pin be connected.Photoelectrical coupler 202 it is defeated
Enter end to be connected with regulating circuit 4 and output circuit 3.
Output circuit 3 is connected 2 in control circuit, and output circuit 3 includes transformation sub-circuit 301 and first and filters sub-circuit
302, transformation sub-circuit 301 and first filters sub-circuit 302 and connected.Transformation sub-circuit 301 is transformer T1, for by input
Voltage diminishes, and exports to the first filtering sub-circuit 302.D3 is commutation diode, for rectification.First filtering sub-circuit 302 wraps
Include electrochemical capacitor C8, electrochemical capacitor C9, common mode inductance LF2；Electrochemical capacitor C8, electrochemical capacitor C9 are in parallel, electrochemical capacitor C8, electrolysis
Electric capacity C9 both ends connect the both ends of transformer T1 secondary coils respectively；Common mode inductance LF2 and electrochemical capacitor C8, electrochemical capacitor C9
Series connection.The input of electrochemical capacitor C8 positive pole connection photoelectrical coupler 202, wherein middle string has resistance R11.
Regulating circuit 4 includes three terminal regulator sub-circuit 401 and resistance trimming sub-circuit 402, three terminal regulator sub-circuit 401 with
Resistance trimming sub-circuit 402 is connected, and three terminal regulator sub-circuit 401 is the sub-circuit of three terminal regulator TL431 controls.Three terminal regulator
TL431 negative pole is connected with the input of photoelectrical coupler 202；Three terminal regulator TL431 plus earth, the end of R15 connections three
Voltage-stablizer TL431 reference edge and negative electrode；Electric capacity C6, resistance R12 connect；Three-terminal voltage-stabilizing is connected after electric capacity C6, resistance R12 series connection
Device TL431 negative electrode and reference edge；Resistance R14 both ends connect electrochemical capacitor C9 positive pole and three terminal regulator TL431 respectively
Reference edge.Resistance trimming sub-circuit 402 includes divider resistance R16 and potentiometer VR, and divider resistance R16 connects with potentiometer VR.R16
One end connection three terminal regulator TL431 reference edge, R16 other end connection potentiometer VR one end, potentiometer VR's is another
One end is grounded.Resistance R16, potentiometer VR, resistance R15 and resistance R14 are used for regulation resistance, resistance R14, resistance R16, potentiometer
VR, the magnitude of voltage at resistance R15 both ends and the magnitude of voltage of output circuit 3 are corresponding by a certain percentage, change potentiometer VR resistance values
Change potentiometer VR both ends computer voltage, so as to adjust the output voltage of output circuit 3.
The operation principle of the utility model LED voltage dimming driving circuit is as follows：
Parallel resistance R15 after resistance R16 series connection potentiometers VR, the resistance value after parallel connection are made as lower inclined resistance, resistance R14
For upper inclined resistance, value of the upper inclined resistance value with the ratio of lower inclined resistance value and then after increase by 1, increase by 1 again with three terminal regulator
TL431 reference voltage 2.5V multiplications are the output voltage of output circuit.
The voltage at lower inclined resistance both ends is compared with the reference voltage of three terminal regulator, if the voltage at lower inclined resistance both ends
Less than three terminal regulator reference voltage 2.5V when, three terminal regulator TL431 does not work, and photoelectrical coupler 202 leads to without electric current
Cross, so photoelectrical coupler 202 is not turned on；When photoelectrical coupler 202 is not turned on, IC controls sub-circuit 201 for working condition,
The output voltage of output circuit 3 raises always；When output circuit 3 export voltage rise to certain value when, upper inclined resistance and it is lower partially
The voltage at resistance both ends also changes therewith.When the voltage at lower inclined resistance both ends rises above three terminal regulator TL431 benchmark
During voltage 2.5V, three terminal regulator TL431 starts working, and three terminal regulator TL431 leads photoelectrical coupler 202 after starting working
It is logical, after photoelectrical coupler 202 turns on, short circuit that the output end of electric coupler 202 will be powered for IC；For IC power supplies
After circuit is short-circuited, IC control sub-circuits 201 are stopped, and the output voltage of output circuit 3 reduces therewith.Output circuit 3 exports
After voltage reduces, the voltage at corresponding upper inclined resistance and lower inclined resistance both ends also reduces therewith, when the voltage at lower inclined resistance both ends
During reference voltage 2.5V less than three terminal regulator TL431, three terminal regulator TL431 is stopped, and three terminal regulator TL431 stops
There is no electric current after only working in photoelectrical coupler 202 by the way that so photoelectrical coupler 202 is not turned on, IC controls the work of sub-circuit 201
Make, the output voltage of output circuit 3.Circulated with this, keep the stabilization of output voltage.
Change potentiometer VR resistance values so as to change the principle of output voltage as above, the voltage at lower inclined resistance both ends and three ends
Potentiometer TL431 reference voltage 2.5V compares, and repeats above-mentioned circulation.Output voltage is realized within the specific limits may be used
Adjust, if during connection LED, so as to realize the change of LED luminance.
More than, the only preferable embodiment of the utility model, but the protection domain of utility model is not limited to
This, any one skilled in the art is in the technical scope that the utility model discloses, the change that can readily occur in
Or replace, it should all cover within the scope of protection of the utility model.Therefore, the scope of protection of the utility model should be with right
The protection domain of claim is defined.
Claims (9)
1. a kind of LED voltage dimming driving circuit, including input circuit (1), control circuit (2), output circuit (3)；It is described defeated
Enter circuit (1), control circuit (2), output circuit (3) to be sequentially connected electrically；Characterized in that, also include regulating circuit (4), it is described
Regulating circuit (4) is connected with the control circuit (2), output circuit (3), for adjusting output voltage.
2. LED voltage dimming driving circuit according to claim 1, it is characterised in that the regulating circuit (4) includes three
Hold voltage-stablizer sub-circuit (401) and resistance trimming sub-circuit (402)；The three terminal regulator sub-circuit (401) and resistance trimming sub-circuit
(402) it is connected.
3. LED voltage dimming driving circuit according to claim 2, it is characterised in that resistance trimming sub-circuit (402) bag
Include divider resistance and potentiometer；The divider resistance is connected with potentiometer.
4. LED voltage dimming driving circuit according to claim 2, it is characterised in that the three terminal regulator sub-circuit
(401) it is the sub-circuit of three terminal regulator TL431 controls.
5. LED voltage dimming driving circuit according to claim 1, it is characterised in that the control circuit (2) includes IC
Control sub-circuit (201) and photoelectrical coupler (202)；The photoelectrical coupler (202) and the IC control sub-circuit (201),
Output circuit (3), regulating circuit (4) connection.
6. LED voltage dimming driving circuit according to claim 5, it is characterised in that the IC control sub-circuits (201)
For the sub-circuit of chip MT6239 controls.
7. LED voltage dimming driving circuit according to claim 5, it is characterised in that the photoelectrical coupler (202) is
PC817B photoelectrical couplers.
8. LED voltage dimming driving circuit according to claim 1, it is characterised in that the output circuit (3) includes becoming
Press sub-circuit (301) and the first filtering sub-circuit (302)；The transformation sub-circuit (301) and first filtering sub-circuit (302) phase
Even.
9. LED voltage dimming driving circuit according to claim 1, it is characterised in that the input circuit (1) includes whole
Flow bridge (101) and the second filtering sub-circuit (102)；The rectifier bridge (101) is connected with the second filtering sub-circuit (102).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720299449.1U CN207083248U (en) | 2017-03-24 | 2017-03-24 | A kind of LED voltage dimming driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720299449.1U CN207083248U (en) | 2017-03-24 | 2017-03-24 | A kind of LED voltage dimming driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207083248U true CN207083248U (en) | 2018-03-09 |
Family
ID=61436005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720299449.1U Expired - Fee Related CN207083248U (en) | 2017-03-24 | 2017-03-24 | A kind of LED voltage dimming driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207083248U (en) |
-
2017
- 2017-03-24 CN CN201720299449.1U patent/CN207083248U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102740545B (en) | Constant voltage dimmable led driver | |
| EP2793276B1 (en) | Led lamp, lighting device including led lamp, and method for controlling electric current of led lamp | |
| CN102762011B (en) | LED (Light Emitting Diode) constant-current dimming drive circuit device | |
| CN201585174U (en) | Led drive circuit | |
| CN105935006B (en) | A kind of LED drive circuit of compatible silicon controlled light modulator | |
| CN207251969U (en) | Light emitting diode electronic pipe | |
| CN2798490Y (en) | LED desk lamp | |
| CN205793482U (en) | A kind of zero-frequency dodges light modulation filament circuit for lamp | |
| CN101925230A (en) | LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost | |
| CN109348583B (en) | Intelligent lamp | |
| CN202721870U (en) | Built-in dimming driving module for LED | |
| CN208128575U (en) | The LED lamp of input power automatic adjustment | |
| CN101893167B (en) | Direct-current power supply for lamp | |
| CN104968070A (en) | LED driving circuit | |
| CN202335026U (en) | LED (light-emitting diode) drive circuit and LED drive chip | |
| CN204518147U (en) | A kind of LED drive circuit | |
| CN107660019A (en) | Light source and light emitting module | |
| CN207083248U (en) | A kind of LED voltage dimming driving circuit | |
| CN209402781U (en) | A kind of ultra-thin photovoltaic intelligent dimming power control circuit | |
| CN105764198A (en) | Driving power supply for compartment LED illumination of railway vehicle | |
| CN207427521U (en) | A kind of LED illumination replaces light source | |
| CN206490855U (en) | A kind of wide pressure power supplies of LED | |
| CN205005320U (en) | Driving circuit of light -emitting diode (LED) fluorescent tube | |
| CN108040400A (en) | LED drive circuit and LED lamp | |
| CN207692103U (en) | A kind of driving circuit for G4 LED light |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180309 Termination date: 20190324 |