CN108112129A - Constant current driver circuit for LED - Google Patents
Constant current driver circuit for LED Download PDFInfo
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- CN108112129A CN108112129A CN201810022284.2A CN201810022284A CN108112129A CN 108112129 A CN108112129 A CN 108112129A CN 201810022284 A CN201810022284 A CN 201810022284A CN 108112129 A CN108112129 A CN 108112129A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The present invention provides a kind of constant current driver circuit for LED, including：Constant-current control module, Isobarically Control module, the first current-limiting circuit, triode switch and LED module；The current constant control end of the output terminal connection constant-current control module of Isobarically Control module, input terminal connect the input terminal of constant-current control module, output terminal connection low potential point；First current-limiting circuit, triode switch and LED module are sequentially connected in series, and the anode of the collector connection LED module of triode switch, emitter connects the output terminal of the first current-limiting circuit, base stage connects the current constant control end of constant-current control module, the input terminal of the input terminal connection constant-current control module of first current-limiting circuit, the cathode of LED module connect low potential point；LED module is lighted when triode switch is operated in saturation region or amplification region, by constant pressure module the first current-limiting circuit of clamper both ends pressure difference, stablizes the electric current of the first current-limiting circuit, to realize the driving current constant for keeping LED.
Description
Technical field
The present invention relates to LED technology field more particularly to a kind of constant current driver circuit for LED.
Background technology
Light emitting diode (Light Emitting Diode, abbreviation LED) is existed with its high efficiency, high integration and high life
Novel energy-conserving light source field is used widely.When forward voltage is less than threshold value, electric current is minimum, and LED does not shine；When voltage surpasses
After crossing threshold value, forward current increases sharply with voltage, and LED shines.
Common LED component includes current-limiting resistance, triode switch and LED.Since LED is constant flow element, existing
LED type of drive in, typically powered with constant-current source to LED component, and the driving voltage of constant-current source generally requires more than
The sum of triode switch base emitter voltage threshold value (such as 0.7V) and LED voltage threshold value (such as 1.8V).
However, since the output of power supply is not usually fixed voltage value, but with maximum output voltage value and minimum
The output voltage range (such as 2~5V) of output voltage values, during existing driving, it may appear that the minimum voltage that power supply provides
The problem of requiring voltage (0.7+1.8=2.5V) close to or smaller than LED component, the current vs voltage variation of LED is very sensitive, by
This easily lead to LED luminance it is unstable or decline.
The content of the invention
The present invention provides a kind of constant current driver circuit for LED, provides constant current constant voltage power supply to LED, makes LED stabilized illuminations.
According to the first aspect of the invention, a kind of constant current driver circuit for LED is provided, including：Constant-current control module, constant pressure control
Molding block, the first current-limiting circuit, triode switch and Light-emitting diode LED module；
The output terminal of the Isobarically Control module connects the current constant control end of the constant-current control module, input terminal connection institute
The input terminal of constant-current control module is stated, the input terminal of the constant-current control module is also connected with power supply, the constant-current control module
Output terminal connects low potential point, and the Isobarically Control module is used to keep both end voltage value constant when both ends electric current is constant；
First current-limiting circuit, triode switch and LED module are sequentially connected in series, and the current collection of the triode switch
Pole connects the anode of the LED module, and emitter connects the output terminal of first current-limiting circuit, and base stage connects the constant current control
The current constant control end of molding block, the input terminal of first current-limiting circuit connects the input terminal of the constant-current control module, described
The cathode connection low potential point of LED module；First current-limiting circuit is used to keep both ends electric current constant when both end voltage is constant；Institute
It states triode switch and is operated in saturation region or amplification region so that the LED module is lighted.
As a kind of realization method, the constant-current control module includes：Load circuit, the first pressure limiting triode, the second limit
Press triode and the second current-limiting circuit；
The output terminal of the extremely described constant-current control module of transmitting of the first pressure limiting triode, collector connection are described negative
The output terminal of circuit is carried, base stage connects the input terminal of second current-limiting circuit；
The input terminal of the load circuit is the input terminal of the constant-current control module, and the output terminal of the load circuit is also
The base stage of the second pressure limiting triode is connected, the emitter of the second pressure limiting triode connects the first pressure limiting triode
Base stage, the current constant control end of the extremely described constant-current control module of current collection of the second pressure limiting triode；
The output terminal of second current-limiting circuit connects the emitter of the first pressure limiting triode, the second current limliting electricity
Road is used to keep both ends electric current constant when both end voltage is constant；
In amplification region, the second pressure limiting triode operation makes in saturation region or amplification region the first pressure limiting triode operation
The electric current at the current constant control end is constant.
As a kind of realization method, the first pressure limiting triode and the second pressure limiting triode are three pole of NPN type
Pipe.
As a kind of realization method, the triode switch is PNP type triode.
As a kind of realization method, the load circuit is the resistance circuit being made of at least one resistance.
As a kind of realization method, second current-limiting circuit is the resistance circuit being made of at least one resistance.
As a kind of realization method, first current-limiting circuit is the resistance circuit being made of at least one resistance；It is described
Isobarically Control module is the resistance circuit being made of at least one resistance.
As a kind of realization method, the Isobarically Control module is voltage-stabiliser tube.
As a kind of realization method, the LED module includes a LED or at least two LED being sequentially connected in series.
The present invention provides a kind of constant current driver circuit for LED, including：Constant-current control module, Isobarically Control module, the first limit
Current circuit, triode switch and Light-emitting diode LED module；The output terminal connection constant-current control module of Isobarically Control module
Current constant control end, input terminal connect the input terminal of constant-current control module, and the input terminal of constant-current control module is also connected with power supply, constant current
The output terminal connection low potential point of control module, Isobarically Control module are used to keep both end voltage value permanent when both ends electric current is constant
It is fixed；First current-limiting circuit, triode switch and LED module are sequentially connected in series, and the collector connection LED module of triode switch
Anode, emitter connect the first current-limiting circuit output terminal, base stage connect constant-current control module current constant control end, first limit
The input terminal of the input terminal connection constant-current control module of current circuit, the cathode of LED module connect low potential point；First current-limiting circuit is used
In when both end voltage is constant keep both ends electric current it is constant；LED module point when triode switch is operated in saturation region or amplification region
It is bright, to realize the driving current constant that LED is kept in mains voltage variations.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology describe needed in attached drawing do and simply introduce, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments, for those of ordinary skill in the art, without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of constant current driver circuit for LED structure diagram provided in an embodiment of the present invention；
Fig. 2 is a kind of constant-current control module structure diagram provided in an embodiment of the present invention；
Fig. 3 shows for the constant current driver circuit for LED structure provided in an embodiment of the present invention comprising constant-current control module shown in Fig. 2
It is intended to；
Fig. 4 is another constant current driver circuit for LED structure diagram provided in an embodiment of the present invention；
Fig. 5 is another constant current driver circuit for LED structure diagram provided in an embodiment of the present invention；
Fig. 6 is another constant current driver circuit for LED structure diagram provided in an embodiment of the present invention.
In figure：
1- constant-current control modules；
2- Isobarically Control modules；
The first current-limiting circuits of 3-；
4-LED modules；
11- load circuits；
The second current-limiting circuits of 12-；
Q1- the first pressure limiting triodes；
Q2- the second pressure limiting triodes；
Q3- triode switches.
Specific embodiment
To 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
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
Only it is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's all other embodiments obtained without making creative work, belong to the scope of protection of the invention.
Term " first ", " second ", " the 3rd " " in description and claims of this specification and above-mentioned attached drawing
The (if present)s such as four " are the objects for distinguishing similar, without being used to describe specific order or precedence.It should manage
The data that solution so uses can exchange in the appropriate case, so as to the embodiment of the present invention described herein can with except
Here the order beyond those for illustrating or describing is implemented.
It should be appreciated that in this application, " comprising " and " having " and their any deformation, it is intended that covering is not arranged
His includes, and is not necessarily limited to clearly for example, containing the process of series of steps or unit, method, system, product or equipment
Those steps or unit listed, but may include not list clearly or for these processes, method, product or equipment
Intrinsic other steps or unit.
It should be appreciated that in this application, " multiple " refer to two or more."and/or" is only that a kind of description is closed
Join object incidence relation, expression there may be three kinds of relations, for example, and/or B, can represent：Individualism A, exists simultaneously
These three situations of A and B, individualism B.It is a kind of relation of "or" that character "/", which typicallys represent forward-backward correlation object,.
It should be appreciated that in this application, the AB extreme pressures drop or AB pole tensions of triode, refer to triode A poles and B poles it
Between pressure drop.For example, base emitter voltage drop or base emitter voltage, refer to the pressure drop between the base stage of triode and emitter；Collection is penetrated
Extreme pressure drops or collection emitter voltage, refers to the pressure drop between the collector of triode and emitter；Collect base stage pressure drop or collection base voltage,
Refer to the pressure drop between the collector of triode and base stage.
Depending on linguistic context, as used in this " if " can be construed to " ... when " or " when ... " or
" in response to determining " or " in response to detection ".
Technical scheme is described in detail with specifically embodiment below.These specific implementations below
Example can be combined with each other, and may be repeated no more for the same or similar concept or process in some embodiments.
It should be noted that the diagram provided in the embodiment of the present invention only illustrates the basic structure of the present invention in a schematic way
Think, it is illustrated that in only display with it is of the invention in related component rather than component count, shape and size during according to actual implementation paint
System, form, quantity and the ratio of each component can be a kind of random change during actual implementation, and its assembly layout form also may be used
It can be increasingly complex.
Since LED generally has the characteristics that small driving voltage, shock resistance and anti-seismic performance are good, reliability is high, long lifespan,
The application field of LED constantly extends.From the indicator light of relatively low luminous flux to display screen, then from outdoor display screen to medium luminous flux
Power signal lamp and the white light source of special lighting finally develop to high light flux general illumination light source.In the application of many LED
In field, it can not all ensure the constant current constant voltage driving to LED simultaneously, and when voltage and current is unstable, it is likely that LED is caused to send out
Photo-labile or extinguishing.An embodiment of the present invention provides a kind of constant current driver circuit for LED, pass through constant-current control module and constant pressure
The collective effect of control module provides constant current on the line in LED module.
Fig. 1 is a kind of constant current driver circuit for LED structure diagram provided in an embodiment of the present invention.
Circuit structure shown in FIG. 1 can be individual circuit or be integrated in electron display device or illumination
Built-in module in device.Electron display device for example can be to carry the equipment of display screen or with signal lamp
Equipment, can also be the luminous end equipment in photoelectric detection system.
Constant current driver circuit for LED as shown in Figure 1 can include at least：Constant-current control module 1, Isobarically Control module 2,
First current-limiting circuit 3, triode switch Q3 and Light-emitting diode LED module 4.In Fig. 1, constant-current control module 1 is provided with
Input terminal, current constant control end and output terminal.The input terminal of constant-current control module 1 is connected with high potential, and constant-current control module 1 is used for
The electric current at control current constant control end is constant or slows down the curent change at current constant control end, and the output terminal of constant-current control module 1 is used for
It is connected with low potential.
With continued reference to constant current driver circuit for LED shown in FIG. 1, the output terminal connection current constant control mould of Isobarically Control module 2
The current constant control end of block 1, input terminal connect the input terminal of constant-current control module 1, and Isobarically Control module 2 is used in both ends electric current not
Keep both end voltage value constant during change.The current constant control end of constant-current control module 1 is powered on the circuit that Isobarically Control module 2 is connected
It flows constant.The input terminal of constant-current control module 1 is also connected with power supply, the output terminal connection low potential point of constant-current control module 1.Low electricity
Site can be understood as ground terminal, then the output terminal of constant-current control module 1 can be directly grounded.Directly and constant-current control module
The power supply of 1 input terminal connection can be understood as DC power supply, for example, dry battery power, lithium manganese button cell (minimum 2V) or
Person is battery feed.
With continued reference to constant current driver circuit for LED shown in FIG. 1, the first current-limiting circuit 3, triode switch Q3 and LED mould
Block 4 is sequentially connected in series, and the anode of the collector connection LED module 4 of triode switch Q3, emitter connect the first current-limiting circuit 3
Output terminal, base stage connect constant-current control module 1 current constant control end, the first current-limiting circuit 3 input terminal connection current constant control
The input terminal of module 1, the cathode of LED module 4 connect low potential point, and the first current-limiting circuit 3 is used to keep when both end voltage is constant
Both ends electric current is constant；Triode switch Q3 is operated in saturation region or amplification region so that LED module 4 is lighted.
In constant current driver circuit for LED shown in Fig. 1, I3=I1+I2, I1For the output current of Isobarically Control module 2, I2For
The base current of triode switch Q3, I3For the electric current at the current constant control end of constant-current control module 1.Due to constant-current control module 1
For causing I3It is constant, and the base current of triode is very faint, can ignore in the present embodiment, it can thus be understood that
The base current I of triode switch Q32For 0.It can thus be appreciated that when supply voltage changes, I3=I1, Isobarically Control module 2
The electric current of place branch is constant.And Isobarically Control module 2 is used to keep both end voltage value constant when both ends electric current is constant, therefore
When supply voltage changes, the voltage value at 2 both ends of Isobarically Control module is definite value.
It will be seen from figure 1 that the input terminal of Isobarically Control module 2 and the input terminal of the first current-limiting circuit 3 are all electric with A points etc.
Gesture, the output terminal of Isobarically Control module 2 and the base stage of triode switch Q3 all with B point equipotentials.Therefore, the first current-limiting circuit 3
On pressure drop and triode switch Q3 base emitter-base bandgap grading on the sum of pressure drop, it is equal with the pressure drop in Isobarically Control module 2, be equal to
A points to B points electrical potential difference.Therefore when supply voltage changes, pressure drop and triode switch Q3 in the first current-limiting circuit 3
Base emitter-base bandgap grading on the sum of pressure drop it is constant.
Due to the characteristic of triode, the voltage at base emitter-base bandgap grading both ends is basically unchanged, i.e., three poles when supply voltage changes
Pressure drop constant on the base emitter-base bandgap grading of pipe switch Q3.And then can determine when supply voltage changes, in the first current-limiting circuit 3
Pressure drop constant.
First current-limiting circuit 3 is used to keep both ends electric current constant when its both end voltage is constant.Therefore the first current-limiting circuit 3
Electric current it is constant, so that it is determined that the emitter current of triode switch Q3 is constant.And from the characteristic of triode, in triode
When being operated in saturation region or amplification region, in the case where setting initial bias current, triode emission electrode current is approximately equal to
Collector current.Therefore, triode switch Q3 collectors are worked with the LED module 4 of constant current driven series connection with it.Driving electricity
It flows constant so that LED module 4 can keep brightness stability in luminescence process.
Fig. 1, Fig. 2 are referred to, between the first pressure limiting triode Q1, the second pressure limiting triode Q2, triode switch Q3 base emitter-base bandgap gradings
Conduction voltage drop threshold value is respectively Vbe1, Vbe2, Veb3 (for triode switch Q3, Veb3=-Vbe3>0).First pressure limiting three
Pole pipe Q1 is operated in amplification region, then C points voltage is more than Vbe1；Second pressure limiting triode Q2 is operated in saturation region or amplification region, then D
Point voltage is more than Vbe1+Vbe2, and B points voltage is more than Vbe1 (i.e. more than C point voltages, while can be less than D points electricity in saturation region
Pressure)；Triode switch Q3 is operated in saturation region or amplification region, then triode switch Q3 emitter voltages are more than Vbe1 (i.e. more than B
Point voltage).For example, routine Vbe1 is generally in 0.7V or so, therefore each triode requires Q3 emitter voltages to be more than at work
0.7V；Conventional single led pressure drop is more than 1.8V, therefore during work triode switch Q3 emitter voltages is required to be more than 1.8V,
In this case the requirement more than 0.7V is met simultaneously so that each triode enters the state that can be worked normally.To sum up retouch
It states, triode switch Q3 emitter voltages are more than LED module pressure drop (such as 1.8V), and 3 both ends pressure drop of the first current-limiting circuit
Can using sets itself as V1 (such as 0.2V), such supply voltage only need to it is bigger V1 than LED module pressure drop (such as supply voltage be 1.8V
+ 0.2V), entire circuit can enter constant current and drive.During the minimum 2V of supply voltage, it is minimum that triode switch Q3 penetrates collector volatge
It can be ignored, as voltage increases, such as supply voltage increases to 3V, then triode switch Q3 penetrates collector volatge and increases to
1V.In supply voltage during minimum voltage (such as 2V) is gradually increased, the driving current of LED module is constant, in power supply
Constant current can be kept to drive in voltage range.It is worth noting that, by selecting the V1 that each device parameters are set bigger when initial,
LED current is more stable.
This branch road that first current-limiting circuit 3, triode switch Q3 and LED module 4 are sequentially connected in series, electric current are defined
Constant, the sum of pressure drop in the first current-limiting circuit 3 and pressure drop on the base emitter-base bandgap grading of triode switch Q3 are defined constant.In power supply
When voltage changes, the pressure drop of the collection emitter-base bandgap grading of triode switch Q3 is changed.The pressure drop of the collection emitter-base bandgap grading of triode switch Q3 becomes
Change amount is equal with the voltage variety of power supply, and electric current is constant, therefore the pressure drop of LED module 4 remains unchanged.
The present invention provides a kind of constant current driver circuit for LED, including：Constant-current control module, Isobarically Control module, the first limit
Current circuit, triode switch and Light-emitting diode LED module；The output terminal connection constant-current control module of Isobarically Control module
Current constant control end, input terminal connect the input terminal of constant-current control module, and the input terminal of constant-current control module is also connected with power supply, constant current
The output terminal connection low potential point of control module, Isobarically Control module are used to keep both end voltage value permanent when both ends electric current is constant
It is fixed；First current-limiting circuit, triode switch and LED module are sequentially connected in series, and the collector connection LED module of triode switch
Anode, emitter connect the first current-limiting circuit output terminal, base stage connect constant-current control module current constant control end, first limit
The input terminal of the input terminal connection constant-current control module of current circuit, the cathode connection low potential point of LED module；First current-limiting circuit
For keeping both ends electric current constant when both end voltage is constant；LED module when triode switch is operated in saturation region or amplification region
It lights, to realize the driving current constant that LED is kept in mains voltage variations.
Fig. 2 is a kind of constant-current control module structure diagram provided in an embodiment of the present invention.
Fig. 3 shows for the constant current driver circuit for LED structure provided in an embodiment of the present invention comprising constant-current control module shown in Fig. 2
It is intended to.
Shown in Fig. 1 on the basis of embodiment, constant-current control module 1 shown in Fig. 2 includes：Load circuit 11, the first pressure limiting
Triode Q1, the second pressure limiting triode Q2 and the second current-limiting circuit 12.
Wherein, the output terminal of the transmitting extremely constant-current control module 1 of the first pressure limiting triode Q1, collector connection load electricity
The output terminal on road 11, base stage connect the input terminal of the second current-limiting circuit 12.Load circuit 11 is as the first pressure limiting triode Q1's
Load, and the change in pressure drop amount of load circuit 11 is equal to mains voltage variations amount, so as to 11 and first pressure limiting three of load circuit
Branch where pole pipe Q1 plays maximum current restriction effect.
With continued reference to constant-current control module 1 shown in Fig. 2, the input terminal of load circuit 11 is the defeated of constant-current control module 1
Enter end, the output terminal of load circuit 11 is also connected with the base stage of the second pressure limiting triode Q2, the emitter of the second pressure limiting triode Q2
Connect the base stage of the first pressure limiting triode Q1, the current constant control of the current collection extremely constant-current control module 1 of the second pressure limiting triode Q2
End.The output terminal of second current-limiting circuit 12 connects the emitter of the first pressure limiting triode Q1, and the second current-limiting circuit 12 is used for two
Keep both ends electric current constant when terminal voltage is constant.First pressure limiting triode Q1 is operated in amplification region, the second pressure limiting triode Q2 works
Make in saturation region or amplification region, the electric current for making current constant control end is constant.
The characteristic being basically unchanged according to triode base emitter voltage, it is known that the voltage at 12 both ends of the second current-limiting circuit is by first
The base emitter voltage clamper of pressure limiting triode Q1.Such as first pressure limiting triode Q1 base emitter voltage drop it is constant in 0.7V, then
The pressure drop of two current-limiting circuits 12 is also constant in 0.7V.Since the second current-limiting circuit 12 is used to keep both ends when both end voltage is constant
Electric current is constant, while its base current is minimum when the first pressure limiting triode Q1 is operated in amplification region, the electricity of the second current-limiting circuit 12
It flows invariable.
Since the base current of triode can almost be ignored, electric current of the second current-limiting circuit 12 etc. in the present embodiment
In the emitter current of the second pressure limiting triode Q2.The collector current of second pressure limiting triode Q2 is to the second pressure limiting triode Q2
Base emitter voltage drop formed negative-feedback so that the second pressure limiting triode Q2 collector current stablize.According to triode operation
Emitter current is approximately equal to collector current in the circuit, the collector current of the second pressure limiting triode Q2 in the present embodiment
Equal to the electric current of the second current-limiting circuit 12, and it is invariable, it is achieved in the constant of the control terminal electric current of constant-current control module 1
Control.
Referring to Fig. 2 and Fig. 3, the base emitter voltage drop of the first pressure limiting triode Q1 and the pressure drop of the second current-limiting circuit 12, all etc.
In output terminal to the pressure drop of C points.The collection base stage pressure drop of first pressure limiting triode Q1 and the base emitter-base bandgap grading pressure of the second pressure limiting triode Q2
Drop is equal to pressure drop of the D points to C points.First pressure limiting triode Q1 of the circuit and the second pressure limiting triode Q2, base emitter-base bandgap grading pressure
Drop is all basically unchanged.So if the low potential of the output terminal connection of constant-current control module 1 is ground, the voltage of D points is the first pressure limiting
2 times of triode Q1 base emitter voltage drops.For example, the base emitter voltage drop of the first pressure limiting triode Q1 and the second pressure limiting triode Q2 are all
For 0.7V, then the voltage of D points is 1.4V.In mains voltage variations, the voltage of D points does not change.
With continued reference to Fig. 3, on the branch road where 11 and first pressure limiting triode Q1 of load circuit, the pressure of load circuit 11
The voltage variety that variable quantity is equal to power supply drops.In Isobarically Control module 2, the second pressure limiting triode Q2 and the second current-limiting circuit
Branch road where 12, the collection emitter voltage drop variable quantity of the second pressure limiting triode Q2 are equal to the voltage variety of power supply.
An embodiment of the present invention provides a kind of constant-current control modules, mainly include：Load circuit, the first pressure limiting triode,
Second pressure limiting triode and the second current-limiting circuit.The output terminal of the transmitting extremely constant-current control module of first pressure limiting triode,
Collector connects the output terminal of load circuit, and base stage connects the input terminal of the second current-limiting circuit.The input terminal of load circuit is perseverance
The input terminal of flow control module, the output terminal of load circuit are also connected with the base stage of the second pressure limiting triode, the second pressure limiting triode
Emitter connect the first pressure limiting triode base stage, the constant current control of the current collection extremely constant-current control module of the second pressure limiting triode
End processed.The output terminal of second current-limiting circuit connects the emitter of the first pressure limiting triode, and the second current-limiting circuit is used in both ends electricity
Keep both ends electric current constant when pressing constant.First pressure limiting triode operation is in amplification region, and the second pressure limiting triode operation is in saturation
Area or amplification region, the electric current for making current constant control end are constant.The present embodiment is by the base emitter voltage of the first pressure limiting triode to
The voltage of two current-limiting circuits carries out clamper, so that the electric current of the second current-limiting circuit is constant, the collector of the second pressure limiting triode
Electric current is equal to the electric current of the second current-limiting circuit, and invariable, is achieved in the current constant control end electric current to constant-current control module
Constant control.The present embodiment is closed by the connection of the first pressure limiting triode, the second pressure limiting triode and the second current-limiting circuit
System obtains constant current constant control end electric current.
On the basis of above-described embodiment, with continued reference to Fig. 2 and Fig. 3, three pole of the first pressure limiting triode Q1 and the second pressure limiting
Pipe Q2 can be NPN type triode.On the basis of above-described embodiment, with continued reference to Fig. 3, triode switch Q3 can be
PNP type triode.Fig. 4 is another constant current driver circuit for LED structure diagram provided in an embodiment of the present invention.
As shown in figure 4, load circuit 11 is the resistance circuit being made of at least one resistance.
Load circuit 11 can be a resistance as shown in Figure 4 or multiple resistance are each other in series or parallel,
To form default load resistance value, so as to limit the collector current on the first pressure limiting triode Q1 and emitter current
It is fixed.
Fig. 5 is another constant current driver circuit for LED structure diagram provided in an embodiment of the present invention.
As shown in figure 5, the second current-limiting circuit 12 is the resistance circuit being made of at least one resistance.
Second current-limiting circuit 12 can be a resistance as shown in Figure 5 or multiple resistance are serially connected or
Parallel connection, to form default second current limliting resistance value, so that it is determined that collector current and emitter on the second pressure limiting triode Q2
Constant current.
Fig. 6 is another constant current driver circuit for LED structure diagram provided in an embodiment of the present invention.
As shown in fig. 6, the first current-limiting circuit 3 is the resistance circuit being made of at least one resistance.Isobarically Control module 2 is
The resistance circuit being made of at least one resistance.First current-limiting circuit 3 and Isobarically Control module 2 can be such as Fig. 6 institutes respectively
The resistance shown or multiple resistance are each other in series or parallel.
On the basis of above-described embodiment, in a kind of optional realization method, Isobarically Control module 2 can be voltage-stabiliser tube.
By setting voltage-stabiliser tube, by the voltage stabilization between A points and B points, so as to obtain the constant of triode switch collector current, into
And it realizes the constant current to LED and drives.
On the basis of above-described embodiment, in a kind of optional realization method, LED module can be a LED, can also
It is at least two LED being sequentially connected in series.At least two LED being sequentially connected in series for example can be that multiple indicator lights either show list
Member.
Each embodiment of foregoing invention can meet lower control source.On the premise of constant current drives, driving voltage can
Down to close to LED voltage drop (for example, only bigger 200mV than LED voltage drop), to meet voltage source and also can under minimum operating voltage
It realizes that the constant current to LED drives, is driven suitable for the indicator light of conventional lithium manganese button cell (minimum 2.0V).Each reality of foregoing invention
It applies a structure and principle is simple, without too many component (such as MCU and pwm control circuit) is used, reduce cost and complexity.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its according to
Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical characteristic into
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is not made to depart from various embodiments of the present invention technology
The scope of scheme.
Claims (10)
1. a kind of constant current driver circuit for LED, which is characterized in that including：Constant-current control module, Isobarically Control module, the first current limliting
Circuit, triode switch and Light-emitting diode LED module；
The output terminal of the Isobarically Control module connects the current constant control end of the constant-current control module, and input terminal connects the perseverance
The input terminal of flow control module, the input terminal of the constant-current control module are also connected with power supply, the output of the constant-current control module
End connection low potential point；
First current-limiting circuit, triode switch and LED module are sequentially connected in series, and the collector of the triode switch connects
The anode of the LED module is connect, emitter connects the output terminal of first current-limiting circuit, and base stage connects the current constant control mould
The current constant control end of block, the input terminal of first current-limiting circuit connect the input terminal of the constant-current control module, the LED moulds
The cathode of block connects the low potential point；
The Isobarically Control module is used to keep both end voltage value constant when both ends electric current is constant；First current-limiting circuit is used
In when both end voltage is constant keep both ends electric current it is constant；The triode switch is operated in saturation region or amplification region so that institute
LED module is stated to light.
2. circuit according to claim 1, which is characterized in that the constant-current control module includes：Load circuit, the first limit
Press triode, the second pressure limiting triode and the second current-limiting circuit；
The output terminal of the extremely described constant-current control module of transmitting of the first pressure limiting triode, the collector connection load electricity
The output terminal on road, base stage connect the input terminal of second current-limiting circuit；
The input terminal of the load circuit is the input terminal of the constant-current control module, and the output terminal of the load circuit is also connected with
The base stage of the second pressure limiting triode, the emitter of the second pressure limiting triode connect the base of the first pressure limiting triode
Pole, the current constant control end of the extremely described constant-current control module of current collection of the second pressure limiting triode；
The output terminal of second current-limiting circuit connects the emitter of the first pressure limiting triode, and second current-limiting circuit is used
In when both end voltage is constant keep both ends electric current it is constant；
In amplification region, the second pressure limiting triode operation makes described in saturation region or amplification region the first pressure limiting triode operation
The electric current at current constant control end is constant.
3. circuit according to claim 2, which is characterized in that the first pressure limiting triode and three pole of the second pressure limiting
Pipe is NPN type triode.
4. circuit according to any one of claims 1 to 3, which is characterized in that the triode switch is PNP type triode.
5. circuit according to claim 2, which is characterized in that the load circuit is the electricity being made of at least one resistance
Resistance circuit.
6. the circuit according to claim 2 or 5, which is characterized in that second current-limiting circuit is by least one resistance
The resistance circuit of composition.
7. circuit according to claim 1, which is characterized in that first current-limiting circuit is to be made of at least one resistance
Resistance circuit.
8. circuit according to claim 1, which is characterized in that the Isobarically Control module is to be made of at least one resistance
Resistance circuit.
9. circuit according to claim 1, which is characterized in that the Isobarically Control module is voltage-stabiliser tube.
10. circuit according to claim 1, which is characterized in that the LED module includes a LED or is sequentially connected in series
At least two LED.
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| CN201810022284.2A CN108112129B (en) | 2018-01-10 | 2018-01-10 | LED constant current driving circuit |
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| CN201810022284.2A CN108112129B (en) | 2018-01-10 | 2018-01-10 | LED constant current driving circuit |
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| CN110767152A (en) * | 2019-11-08 | 2020-02-07 | 深圳市德普微电子有限公司 | Constant current source generating method of LED display screen driving chip |
| CN110827747A (en) * | 2019-11-08 | 2020-02-21 | 深圳市德普微电子有限公司 | Constant current source generating circuit of common-cathode LED display screen driving chip |
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| CN113939059A (en) * | 2021-09-30 | 2022-01-14 | 马瑞利汽车零部件(芜湖)有限公司 | Shunting type LED current type sectional dimming circuit, lamp and automobile |
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| CN108112129B (en) | 2023-12-12 |
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