CN205812458U - A kind of LED linear constant-current drive circuit and LED light device - Google Patents
A kind of LED linear constant-current drive circuit and LED light device Download PDFInfo
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- CN205812458U CN205812458U CN201620745190.4U CN201620745190U CN205812458U CN 205812458 U CN205812458 U CN 205812458U CN 201620745190 U CN201620745190 U CN 201620745190U CN 205812458 U CN205812458 U CN 205812458U
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Abstract
This utility model is applicable to field of LED drive, a kind of LED linear constant-current drive circuit and LED light device are provided, described LED linear constant-current drive circuit includes rectifier bridge, first exchange end of described rectifier bridge connects civil power live wire by controllable silicon dimmer, second exchange termination civil power zero line of described rectifier bridge, the outfan of described rectifier bridge connects the input of first order LED chip in the LED load being in series by multiple LED chip, and the earth terminal of described rectifier bridge connects ground；Described LED linear constant-current circuit also includes that current drain module, current regulating module, enable module and load drive module.This utility model can make LED load be operated in linear constant current region, while obtaining good dimming function, is prevented effectively from the grating noise that the peak surge electric current of switching power circuit is caused.
Description
Technical field
This utility model belongs to field of LED drive, particularly relates to a kind of LED linear constant-current drive circuit and LED illumination dress
Put.
Background technology
LED illumination product is widely used in illumination, household electrical appliances, machinery due to its reliability height, life-span length, good stability
The numerous areas such as production.Prior art generally use switching power circuit based on controllable silicon dimmer to LED illumination product
Carry out brightness adjustment control.
But, owing to traditional switching power circuit and LED have non-pure resistance load characteristic, switching power circuit connects can
Control silicon dimmer can cause the input electric current of switching power circuit to there is peak surge, thus causes piezoelectric effect, and produces
Harsh noise.
Utility model content
The purpose of this utility model is to provide a kind of LED linear constant-current drive circuit and LED light device, it is intended to solve
Owing to traditional switching power circuit and LED have non-pure resistance load characteristic, switching power circuit connects controllable silicon dimmer meeting
There is peak surge in the input electric current causing switching power circuit, thus causes piezoelectric effect, and produces harsh noise
Problem.
This utility model is achieved in that a kind of LED linear constant-current drive circuit, and it includes rectifier bridge, described rectification
First exchange end of bridge connects civil power live wire by controllable silicon dimmer, the second exchange termination civil power zero line of described rectifier bridge, institute
The outfan stating rectifier bridge connects the input of first order LED chip, institute in the LED load being in series by multiple LED chip
The earth terminal stating rectifier bridge connects ground；It is characterized in that, described LED linear constant-current circuit also includes current drain module, electric current
Adjustment module, enable module and load drive module；
The input of described current drain module and the input of described current regulating module, the input of described enable module
End, described load drive the first power end of module and the input of described LED load to be connected to the outfan of described rectifier bridge altogether,
The end that controls of described current drain module drives the earth terminal of module to be connected to simulation ground, described current drain mould altogether with described load
The earth terminal ground connection of block；The current settings end of described current regulating module and outfan connect described load respectively and drive the electricity of module
Stream sets end and ground；The Enable Pin of described enable module and earth terminal connect described load respectively and drive Enable Pin and the simulation of module
Ground；Described load drives the second source termination simulation ground of module, and described load drives multiple outfans of module to pass through respectively
Multiple commutation diodes connect one to one with the outfan of the plurality of LED chip；
When described rectifier bridge accesses civil power, the conducting of described current drain module provides for described controllable silicon dimmer and maintains
Electric current, described linear constant current is loaded with the first power end driving module and is obtained electric energy from the outfan of described rectifier bridge；
Progressively regulate to the big angle of flow by Small conduction angle at described controllable silicon dimmer, described current drain mould
Block turns off, and described current regulating module makes described load drive the operating current of module to incrementally increase to described load driving module
Current margin in, the most described enable module triggers described load and drives LED load work described in module drive；
Progressively regulate to Small conduction angle by the big angle of flow at described controllable silicon dimmer, described current drain mould
Block recovers conducting, and described current regulating module makes described load drive the operating current of module progressively to decrease below described load
Driving the minimum working current of module, the most described enable module triggers described load and drives module to close, so that described LED bears
Carry module from service.
Preferably, described current drain module includes release constant current chip and switch element of releasing；
The input of described constant current chip of releasing is the input of described current drain module, described in release constant current chip
Earth terminal and current settings end ground connection respectively and the input of described switch element of releasing；
The control end of described switch element of releasing and outfan are respectively control end and the output of described current drain module
End；
When described rectifier bridge accesses civil power, described in release the current settings end constant vent discharge of output of constant current chip
Stream, provides for described controllable silicon dimmer and maintains electric current；
Progressively regulate to the big angle of flow by Small conduction angle at described controllable silicon dimmer, described in switch of releasing single
The voltage difference controlled between end and outfan of unit incrementally increases, and makes described current drain module turn off；
Progressively regulate to Small conduction angle by the big angle of flow at described controllable silicon dimmer, described in switch of releasing single
The voltage difference controlled between end and outfan of unit progressively reduces, and makes described current drain module recovery turn on and is described controlled
Silicon dimmer provides and maintains electric current.
Preferably, switch element of releasing described in includes the first divider resistance and the second divider resistance, described first dividing potential drop electricity
Release the input of switch element, the other end of described first divider resistance and described second dividing potential drop electricity described in constituting in one end of resistance
One end of resistance connects the control end of switch element of releasing described in composition altogether, the other end of described second divider resistance be described in release out
Close the outfan of unit；
Progressively regulate to the big angle of flow by Small conduction angle at described controllable silicon dimmer, described second dividing potential drop electricity
Resistance both end voltage difference incrementally increases, and makes described current drain module turn off；
Progressively regulate to Small conduction angle by the big angle of flow at described controllable silicon dimmer, described second dividing potential drop electricity
Resistance both end voltage difference progressively reduces, and makes described current drain module recovery conducting provide for described controllable silicon dimmer and maintains electricity
Stream.
Preferably, described current drain module also includes being connected to the outfan of described rectifier bridge and described constant current core of releasing
Current limliting partial pressure unit between the input of sheet, first input end and second input of described current limliting partial pressure unit are all connected with institute
State the outfan of rectifier bridge, the earth terminal of described current limliting partial pressure unit and outfan connect respectively and described constant current chip of releasing
Input.
Preferably, described current limliting partial pressure unit includes the first current-limiting resistance, rectifier tube and the first metal-oxide-semiconductor；
One end of described first current-limiting resistance is the first input end of described current limliting partial pressure unit；
The other end of described first current-limiting resistance is total to the control end of the negative pole of described rectifier tube and described first metal-oxide-semiconductor
Connect, the plus earth of described rectifier tube；
The input of described first metal-oxide-semiconductor and outfan are the second input and the outfan of described current limliting partial pressure unit.
Preferably, described current regulating module include the 3rd divider resistance, the 4th divider resistance, the 6th current-limiting resistance,
Five divider resistances, the first electric capacity and the second metal-oxide-semiconductor；
The input that one end is described current regulating module of described 3rd divider resistance, described 3rd divider resistance another
One end connects altogether with one end of one end, the positive pole of described first electric capacity and described 6th current-limiting resistance of described 4th divider resistance,
The other end of described 4th divider resistance and the negative pole of described first electric capacity are connected to simulation ground altogether；
The control end of another described second metal-oxide-semiconductor of termination of described 6th current-limiting resistance, the outfan of described second metal-oxide-semiconductor
Simulation ground, the current settings that input is described current regulating module of described second metal-oxide-semiconductor is connect through described 5th divider resistance
End.
Preferably, described enable module includes the 6th divider resistance, the 7th divider resistance, the 8th divider resistance and the second electricity
Hold；
The input that one end is described enable module of described 6th divider resistance, the other end of described 6th divider resistance
Connect altogether with one end of described 7th divider resistance and one end of described 8th divider resistance, the other end of described 7th divider resistance
Simulation ground it is connected to altogether with the negative pole of described second electric capacity；
The other end of described 8th divider resistance connects altogether with the positive pole of described second electric capacity and constitutes making of described enable module
Can end.
Preferably, described load drives module to include loading constant current chip, supplying resistance and the 3rd electric capacity；
One end of described supplying resistance is the first power end that described load drives module, the other end of described supplying resistance
Connect the first power end of described load constant current chip, the Enable Pin of described load constant current chip, current settings end and multiple output
End is respectively described load and drives the Enable Pin of module, current settings end and multiple outfan, and the positive pole of described 3rd electric capacity connects
The second source end of described load constant current chip, the negative pole of described 3rd electric capacity is the second source that described load drives module
End.
Preferably, described LED linear constant-current drive circuit also include respectively with the outfan of described rectifier bridge, described LED
The rectification that in load, in the input of the LED chip of the first order and described LED load, the outfan of the LED chip of final stage connects
Filtration module.
This utility model also provides for a kind of LED light device, and it includes above-mentioned LED linear constant-current drive circuit.
Compared with prior art, it has the beneficial effects that this utility model:
By the LED linear perseverance being made up of current drain module, current regulating module, enable module and load driving module
Stream drive circuit replaces traditional switching power circuit to connect controllable silicon dimmer, and LED load can be made to be operated in linear constant current district
Territory, be prevented effectively from while obtaining good dimming function that the peak surge electric current of switching power circuit caused ear-piercing makes an uproar
Sound.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the LED linear constant-current drive circuit that this utility model embodiment one provides；
Fig. 2 is the structured flowchart of the LED linear constant-current drive circuit that this utility model embodiment two provides；
Fig. 3 is the circuit theory diagrams of the LED linear constant-current drive circuit that this utility model embodiment one provides；
Fig. 4 is the circuit theory diagrams of the LED linear constant-current drive circuit that this utility model embodiment two provides.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.Should be appreciated that specific embodiment described herein is only in order to explain this
Utility model, is not used to limit this utility model.
Term in specification and claims of the present utility model and above-mentioned accompanying drawing " includes " and they any changes
Shape, it is intended that cover non-exclusive comprising.Additionally, term " first ", " second " and " the 3rd " etc. are different right for distinguishing
As, not for describing particular order.
Embodiment one:
As it is shown in figure 1, the LED linear constant-current drive circuit 100 that the present embodiment provides, it includes that rectifier bridge 10, electric current are let out
Amplification module 20, current regulating module 30, enable module 40 and load drive module 50.
First exchange end of rectifier bridge 10 meets civil power live wire L by controllable silicon dimmer 200, the second exchange of rectifier bridge 10
Termination civil power zero line N, the outfan of rectifier bridge 10 connects the first order in the LED load 300 being in series by multiple LED chip
The input of LED chip, the earth terminal of rectifier bridge 10 connects ground.
The input of the input of current drain module 20 and current regulating module 30, enable the input of module 40, negative
Carry the outfan driving the first power end of module 50 and the input of LED load 300 to be connected to rectifier bridge 10 altogether, current drain mould
The end that controls of block 20 drives the earth terminal of module 50 to be connected to simulation ground, the earth terminal ground connection of current drain module 20 altogether with load.
The current settings end of current regulating module 30 and outfan respectively connect load drive module 50 current settings end and
Ground.
The Enable Pin and the earth terminal that enable module 40 connect load respectively and drive Enable Pin and the simulation ground of module 50.
Load drives the second source termination simulation ground of module 50, and load drives multiple outfans of module 50 to pass through respectively
Multiple commutation diodes connect one to one with the outfan of multiple LED chip.
When rectifier bridge 10 accesses civil power, current drain module 20 turns on to provide into controllable silicon dimmer 200 and maintains electric current,
Making controllable silicon dimmer 200 normally, linear constant current is loaded with and is driven the first power end of module from the outfan of rectifier bridge 10
Obtain electric energy；
Progressively regulate to the big angle of flow by Small conduction angle at controllable silicon dimmer 200, current drain module 20
Turning off, to improve the drive efficiency of LED linear constant-current drive circuit, current regulating module 30 makes load drive the work of module 50
Electric current incrementally increases in the current margin driving module 50 to load, enables module 40 triggering load simultaneously and drives module 50
LED load 300 is driven to work；
Progressively regulate to Small conduction angle by the big angle of flow at controllable silicon dimmer 200, current drain module 20
Recover conducting, provide extinction current, current regulating module 30 to make load drive the work of module 50 for controllable silicon dimmer 200
Make electric current and progressively decrease below the minimum working current of load driving module 50, enable module 40 triggering load simultaneously and drive mould
Block 50 is closed, so that LED load 300 module from service.
The present embodiment, can make LED load 300 be operated in linear constant current region, while obtaining good dimming function
It is prevented effectively from the grating noise that the peak surge electric current of switching power circuit is caused.
Embodiment two:
As in figure 2 it is shown, the present embodiment is the further refinement to embodiment one, in the present embodiment, current drain module
20 include release constant current chip 21, release switch element 22 and current limliting partial pressure unit 23, and LED linear constant-current drive circuit 100 is also
Including rectification filtering module 60, wire resistor FR1 and lightning protection filter circuit 70.
Release the input that input is current drain module 20 of constant current chip 21, the earth terminal of constant current chip 21 of releasing
With current settings end ground connection respectively and the input of switch element 22 of releasing；
Control end and the outfan of switch element 22 of releasing is respectively control end and the outfan of current drain module 20；
When rectifier bridge 10 accesses civil power, the current settings end of constant current chip 21 of releasing exports constant leakage current, for
Controllable silicon dimmer 200 provides and maintains electric current, makes controllable silicon dimmer 200 normally；
Progressively regulate to the big angle of flow by Small conduction angle at controllable silicon dimmer 200, switch element 22 of releasing
The voltage difference controlled between end and outfan incrementally increase, make current drain module 20 turn off, drive improving LED linear constant current
The drive efficiency on galvanic electricity road；
Progressively regulate to Small conduction angle by the big angle of flow at controllable silicon dimmer 200, switch element 22 of releasing
The voltage difference controlled between end and outfan progressively reduce, make current drain module 20 recover conducting and for controllable silicon dimmer
200 provide maintenance electric current.
Current limliting partial pressure unit 23 is connected between the outfan of rectifier bridge 10 and the input of constant current chip 21 of releasing, current limliting
The first input end of partial pressure unit 23 and the second input are all connected with the outfan of rectifier bridge 10, the ground connection of current limliting partial pressure unit 23
End and outfan connect respectively and the input of constant current chip 21 of releasing.
Rectification filtering module 60 respectively with the LED chip of the first order defeated in the outfan of rectifier bridge 10, LED load 300
The outfan entering the LED chip of final stage in end and LED load 300 connects.
Wire resistor FR1 is connected on civil power live wire L；Lightning protection filter circuit 70 is connected to civil power live wire L, civil power zero line N
And between the first exchange end of rectifier bridge 10 and the second exchange end, for eliminating the electromagnetic interference (EMI) of mains current, anti-lightning
Surge.
Embodiment three:
As it is shown on figure 3, the circuit theory of the LED linear constant-current drive circuit 100 that the present embodiment is embodiment one to be provided
Figure.
In the present embodiment, the input that input OUT is current drain module 20 of constant current chip 21 of releasing, perseverance of releasing
The stream earth terminal GND of chip 21 and current settings end REXT ground connection respectively and the input of switch element 22 of releasing；
Switch element 22 of releasing includes the first divider resistance R1A and the second divider resistance R1B, the first divider resistance R1A's
One end constitutes the input of switch element 22 of releasing, the other end of the first divider resistance R1A and one end of the second divider resistance R1B
Connecing altogether and constitute the control end of switch element 22 of releasing, the other end of the second divider resistance R1B is the output of switch element 22 of releasing
End；
Progressively regulate to the big angle of flow by Small conduction angle at controllable silicon dimmer 200, the second divider resistance R1B
Both end voltage difference incrementally increases, and makes current drain module 20 turn off, to improve the drive efficiency of LED linear constant-current drive circuit；
Progressively regulate to Small conduction angle by the big angle of flow at controllable silicon dimmer 200, the second divider resistance R1B
Both end voltage difference progressively reduces, and makes current drain module 20 recover conducting and provides maintenance electric current for controllable silicon dimmer 200, now
The electric current of the earth terminal output controlling end and load driving module 50 of current drain module 20 flows into through the second divider resistance R1B
Ground.
First divider resistance R1A is for carrying out overvoltage protection, the first dividing potential drop to the current settings end of constant current chip 21 of releasing
The size of the resistance sum of resistance R1A and the second divider resistance R1B determines the size of the leakage current of current drain module 20.?
In the case of the resistance sum of the first divider resistance R1A and the second divider resistance R1B immobilizes, if improving the first divider resistance
The resistance of R1A, reduce the resistance of the second divider resistance R1B, then the working time of current drain module 20 can be made to extend；If reducing
The resistance of the first divider resistance R1A, the resistance of the second divider resistance R1B of improving, then when can make the work of current drain module 20
Between shorten.In one embodiment, the first divider resistance R1A can remove.
Current regulating module 30 include the 3rd divider resistance R3, the 4th divider resistance R4, the 6th current-limiting resistance R5, the 5th point
Piezoresistance R6, the first electric capacity C1 and the second metal-oxide-semiconductor Q2；
The input that one end is current regulating module 30 of the 3rd divider resistance R3, the other end of the 3rd divider resistance R3 with
One end of one end of 4th divider resistance R4, the positive pole of the first electric capacity C1 and the 6th current-limiting resistance R5 connects altogether, the 4th divider resistance
The other end of R4 and the negative pole of the first electric capacity C1 are connected to simulation ground altogether；
Another of 6th current-limiting resistance R5 terminates the control end of the second metal-oxide-semiconductor Q2, and the outfan of the second metal-oxide-semiconductor Q2 is through the 5th
Divider resistance R6 connects simulation ground, the current settings end that input is current regulating module 30 of the second metal-oxide-semiconductor Q2；
4th divider resistance R4 and the first electric capacity C1 constitute filter circuit to filter current ripples,
Progressively regulate to the big angle of flow by Small conduction angle at controllable silicon dimmer 200, the resistance of the second metal-oxide-semiconductor Q2
Resist and progressively reduce, make load drive the operating current of module 50 to incrementally increase；
Progressively regulate to Small conduction angle by the big angle of flow at controllable silicon dimmer 200, the resistance of the second metal-oxide-semiconductor Q2
Resist and incrementally increase, make load drive the operating current of module 50 progressively to reduce.
In a particular application, the second metal-oxide-semiconductor Q2 is N-type metal-oxide-semiconductor, and the grid of described N-type metal-oxide-semiconductor, drain electrode and source electrode are respectively
Constitute controlled end, input and the outfan of described second metal-oxide-semiconductor Q2.
Enable module 40 and include the 6th divider resistance R7, the 7th divider resistance R8, the 8th divider resistance R9 and the second electric capacity
C2；
One end of 6th divider resistance R7 is the input enabling module, the other end of the 6th divider resistance R7 and the 7th point
One end of piezoresistance R8 and one end of the 8th divider resistance R9 connect altogether, the other end of the 7th divider resistance R8 and the second electric capacity C2's
Negative pole is connected to simulation ground altogether；
The other end of the 8th divider resistance R9 and the positive pole of the second electric capacity C2 connect altogether and constitute the Enable Pin enabling module 40.
In the present embodiment, load drives module 50 to include loading constant current chip 51, supplying resistance R10 and the 3rd electric capacity
C3；
One end of supplying resistance R10 is the first power end that load drives module 50, and another termination of supplying resistance R10 is negative
Carry the first power end VIN of constant current chip 51, load Enable Pin TRAIC of constant current chip 51, current settings end REXT and multiple
Outfan (being expressed as OUT1, OUT2 ..., OUTn in Fig. 2) is respectively load and drives the Enable Pin of module 50, current settings end
With multiple outfans, the positive pole of the 3rd electric capacity C3 connects the second source end VDD of load constant current chip 51, the negative pole of the 3rd electric capacity C3
Drive the second source end of module 50, load constant current chip 51 to drive LED load 300 to work when working, make multiple LED for load
Chip is opened and opening and closing step by step.
When the first power end VIN loading constant current chip 51 powers on, the second source end VDD of load constant current chip 51 gives
3rd electric capacity C3 charging, so that the 3rd electric capacity C3 stores electric energy, after the 3rd electric capacity C3 is fully charged, load constant current chip 51 is opened
Beginning work, when loading constant current chip 51 and not working, the 3rd electric capacity C3 starts electric discharge.
Embodiment four:
As shown in Figure 4, the present embodiment is the circuit theory of the LED linear constant-current drive circuit 100 that embodiment two is provided
Figure.
In the present embodiment, current limliting partial pressure unit 23 includes the first current-limiting resistance R6A, rectifier tube DZ1 and the first metal-oxide-semiconductor
Q1；
One end of first current-limiting resistance R6A is limited and flows the first input end of partial pressure unit 23；
The other end of the first current-limiting resistance R6A connects altogether with the control end of the negative pole of rectifier tube DZ1 and the first metal-oxide-semiconductor Q1, whole
The plus earth of flow tube DZ1；
The input of the first metal-oxide-semiconductor Q1 and outfan are limited and flow the second input and the outfan of partial pressure unit 23；
When rectifier bridge 10 accesses civil power, the first metal-oxide-semiconductor Q1 is operated in variable resistance district, and constant current chip 21 of releasing starts work
Make, produce constant leakage current with the current settings end REXT at constant current chip 21 of releasing, provide for controllable silicon dimmer 200
Maintain electric current, make controllable silicon dimmer 200 normally.
As shown in Figure 4, in the present embodiment, current limliting partial pressure unit 23 also includes the second current-limiting resistance R2B, the 3rd current limliting electricity
Resistance R2C, the 4th current-limiting resistance R2D and the 5th current-limiting resistance R2E, the second current-limiting resistance R2B is connected to the outfan of rectifier bridge 10
And first current-limiting resistance R2A one end between, the 3rd current-limiting resistance R2C and the 4th current-limiting resistance R2D is serially connected in rectifier bridge 10
Between the input of outfan and the first switching tube Q1, the 5th current-limiting resistance R2E is connected to another of the first current-limiting resistance R2A
Hold, between the negative pole of rectifier tube DZ1 and the control end of the first metal-oxide-semiconductor Q1.
In a particular application, the first metal-oxide-semiconductor Q1 is N-type metal-oxide-semiconductor, and the grid of described N-type metal-oxide-semiconductor, drain electrode and source electrode are respectively
Constitute controlled end, input and the outfan of described first metal-oxide-semiconductor Q1.
Current rectifying and wave filtering circuit 60 includes diode D1, resistance R11 and electric capacity E1；
The positive pole of diode D1 meets the outfan of rectifier bridge 10, the negative pole of diode D1 and one end of resistance R11, electric capacity E1
One end and be connected on the input of the LED chip of the first order in LED load 300 and connect altogether；
The other end of resistance R11, the other end of electric capacity E1 and be connected on LED chip defeated of final stage in LED load 300
Go out end to connect altogether.
Lightning protection filter circuit 70 includes anti-thunder tube RV1 parallel with one another and electric capacity CX1.
Drive in load and also connected one to one between multiple outfans and the outfan of multiple LED chip of module 50
Multiple current-limiting resistances.
This utility model embodiment also provides for a kind of LED light device, and it includes LED linear constant-current driving as above
Circuit.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this
Any amendment, equivalent and the improvement etc. made within the spirit of utility model and principle, should be included in this utility model
Protection domain within.
Claims (10)
1. a LED linear constant-current drive circuit, it includes rectifier bridge, and the first exchange end of described rectifier bridge passes through thyristor regulating
Light device connects civil power live wire, and the second exchange termination civil power zero line of described rectifier bridge, the outfan of described rectifier bridge connects by multiple
The input of first order LED chip in the LED load that LED chip is in series, the earth terminal of described rectifier bridge connects ground；It is special
Levying and be, described LED linear constant-current circuit also includes that current drain module, current regulating module, enable module and load drive
Module；
The input of described current drain module and the input of described current regulating module, the input of described enable module,
Described load drives the first power end of module and the input of described LED load to be connected to the outfan of described rectifier bridge, institute altogether
The end that controls stating current drain module drives the earth terminal of module to be connected to simulation ground, described current drain module altogether with described load
Earth terminal ground connection；The current settings end of described current regulating module and outfan connect described load respectively and drive the electric current of module
Set end and ground；The Enable Pin of described enable module and earth terminal connect described load respectively and drive Enable Pin and the simulation of module
Ground；Described load drives the second source termination simulation ground of module, and described load drives multiple outfans of module to pass through respectively
Multiple commutation diodes connect one to one with the outfan of the plurality of LED chip；
When described rectifier bridge accesses civil power, the conducting of described current drain module provides for described controllable silicon dimmer and maintains electricity
Stream, described linear constant current is loaded with the first power end driving module and is obtained electric energy from the outfan of described rectifier bridge；
Progressively regulating to the big angle of flow by Small conduction angle at described controllable silicon dimmer, described current drain module is closed
Disconnected, described current regulating module makes described load drive the operating current of module to incrementally increase the work to described load driving module
Making in current range, the most described enable module triggers described load and drives LED load work described in module drive；
Progressively regulating to Small conduction angle by the big angle of flow at described controllable silicon dimmer, described current drain module is extensive
Conducting again, described current regulating module makes described load drive the operating current of module progressively to decrease below described load driving
The minimum working current of module, the most described enable module triggers described load and drives module to close, so that described LED load mould
Block quits work.
2. LED linear constant-current drive circuit as claimed in claim 1, it is characterised in that described current drain module includes letting out
Put constant current chip and switch element of releasing；
The input of described constant current chip of releasing is the input of described current drain module, described in release the ground connection of constant current chip
End and current settings end ground connection respectively and the input of described switch element of releasing；
The control end of described switch element of releasing and outfan are respectively control end and the outfan of described current drain module；
When described rectifier bridge accesses civil power, described in release the current settings end constant leakage current of output of constant current chip, for
Described controllable silicon dimmer provides and maintains electric current；
Progressively regulate to the big angle of flow by Small conduction angle at described controllable silicon dimmer, described in release switch element
The voltage difference controlled between end and outfan incrementally increases, and makes described current drain module turn off；
Progressively regulate to Small conduction angle by the big angle of flow at described controllable silicon dimmer, described in release switch element
The voltage difference controlled between end and outfan progressively reduces, and makes described current drain module recovery turn on and is described thyristor regulating
Light device provides and maintains electric current.
3. LED linear constant-current drive circuit as claimed in claim 2, it is characterised in that described in switch element of releasing include the
One divider resistance and the second divider resistance, one end of described first divider resistance constitute described in release the input of switch element,
One end of the other end of described first divider resistance and described second divider resistance connects the control of switch element of releasing described in composition altogether
End processed, the other end of described second divider resistance be described in release the outfan of switch element；
Progressively regulate to the big angle of flow by Small conduction angle at described controllable silicon dimmer, described second divider resistance two
Terminal voltage difference incrementally increases, and makes described current drain module turn off；
Progressively regulate to Small conduction angle by the big angle of flow at described controllable silicon dimmer, described second divider resistance two
Terminal voltage difference progressively reduces, and makes described current drain module recovery conducting provide for described controllable silicon dimmer and maintains electric current.
4. LED linear constant-current drive circuit as claimed in claim 2, it is characterised in that described current drain module also includes
It is connected to the current limliting partial pressure unit between the input of the outfan of described rectifier bridge and described constant current chip of releasing, described current limliting
The first input end of partial pressure unit and the second input are all connected with the outfan of described rectifier bridge, connecing of described current limliting partial pressure unit
Ground end and outfan connect respectively and the input of described constant current chip of releasing.
5. LED linear constant-current drive circuit as claimed in claim 4, it is characterised in that described current limliting partial pressure unit includes the
One current-limiting resistance, rectifier tube and the first metal-oxide-semiconductor；
One end of described first current-limiting resistance is the first input end of described current limliting partial pressure unit；
The other end of described first current-limiting resistance connects altogether with the control end of the negative pole of described rectifier tube and described first metal-oxide-semiconductor, institute
State the plus earth of rectifier tube；
The input of described first metal-oxide-semiconductor and outfan are the second input and the outfan of described current limliting partial pressure unit.
6. LED linear constant-current drive circuit as claimed in claim 1, it is characterised in that described current regulating module includes the
Three divider resistances, the 4th divider resistance, the 6th current-limiting resistance, the 5th divider resistance, the first electric capacity and the second metal-oxide-semiconductor；
The input that one end is described current regulating module of described 3rd divider resistance, the other end of described 3rd divider resistance
Connect altogether with one end of one end, the positive pole of described first electric capacity and described 6th current-limiting resistance of described 4th divider resistance, described
The other end of the 4th divider resistance and the negative pole of described first electric capacity are connected to simulation ground altogether；
The control end of another described second metal-oxide-semiconductor of termination of described 6th current-limiting resistance, the outfan of described second metal-oxide-semiconductor is through institute
State the 5th divider resistance and connect simulation ground, the current settings end that input is described current regulating module of described second metal-oxide-semiconductor.
7. LED linear constant-current drive circuit as claimed in claim 1, it is characterised in that described enable module includes the 6th point
Piezoresistance, the 7th divider resistance, the 8th divider resistance and the second electric capacity；
The input that one end is described enable module of described 6th divider resistance, the other end of described 6th divider resistance and institute
One end of one end and described 8th divider resistance of stating the 7th divider resistance connects altogether, the other end of described 7th divider resistance and institute
The negative pole stating the second electric capacity is connected to simulation ground altogether；
The other end of described 8th divider resistance and the positive pole of described second electric capacity connect the Enable Pin constituting described enable module altogether.
8. LED linear constant-current drive circuit as claimed in claim 1, it is characterised in that described load drives module to include bearing
Carry constant current chip, supplying resistance and the 3rd electric capacity；
One end of described supplying resistance is the first power end that described load drives module, another termination institute of described supplying resistance
Stating the first power end of load constant current chip, the Enable Pin of described load constant current chip, current settings end and multiple outfan divide
Not Wei described load to drive the Enable Pin of module, current settings end and multiple outfan, the positive pole of described 3rd electric capacity to connect described
The second source end of load constant current chip, the negative pole of described 3rd electric capacity is the second source end that described load drives module.
9. LED linear constant-current drive circuit as claimed in claim 1, it is characterised in that described LED linear constant-current drive circuit
Also include respectively with the input of the LED chip of the first order in the outfan of described rectifier bridge, described LED load and described LED
The rectification filtering module of the outfan connection of the LED chip of final stage in load.
10. a LED light device, it is characterised in that described LED light device includes as described in any one of claim 1～9
LED linear constant-current drive circuit.
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| CN201620745190.4U CN205812458U (en) | 2016-07-14 | 2016-07-14 | A kind of LED linear constant-current drive circuit and LED light device |
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