CN109068441A - A kind of LED sectional dimming circuit - Google Patents
A kind of LED sectional dimming circuit Download PDFInfo
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- CN109068441A CN109068441A CN201810873292.8A CN201810873292A CN109068441A CN 109068441 A CN109068441 A CN 109068441A CN 201810873292 A CN201810873292 A CN 201810873292A CN 109068441 A CN109068441 A CN 109068441A
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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]
- H05B45/10—Controlling the intensity of the light
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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]
- H05B45/40—Details of LED load circuits
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention provides a kind of LED sectional dimming circuits, including loading LED, constant-current driven chip, it further include the sampling unit as the constant-current driven chip sampling resistor, the sampling unit includes the first sampling resistor R6 and at least one sample circuit, the sample circuit is connected in parallel with the first sampling resistor R6, and the sample circuit further includes another sampling resistor to be accessed；Dim signal is accessed in the sample circuit, one end, and the other end is connect with the constant-current driven chip, for determining whether the sampling resistor to be accessed accesses circuit according to the dim signal, to carry out sectional dimming to the load LED.The present invention adds sample circuit in circuit, and dim signal is accessed in sample circuit, by controlling dim signal, control the sampling resistor resistance value of constant-current driven chip, to adjust the output electric current of load LED, LED sectional dimming function only can be realized by controlling the dim signal of sample circuit, it is at low cost, and be easily achieved, it is versatile.
Description
Technical field
The present invention relates to lighting technical fields, more particularly to a kind of LED sectional dimming circuit.
Background technique
LED (light emitting diode) has the characteristics that energy-saving and environmental protection, efficient, and therefore, LED is made extensively as lighting source
With the demand in the market to LED light modulation product is also more and more extensive therewith.
But LED dimming arrangement at this stage, compare dependence light modulation driving chip, higher cost is difficult to accomplish general
Property.Fig. 1 is the LED drive circuit of buck structure in the prior art, and LED current is by constant-current driven chip U1 and the first sampling resistor
R6 is determined.It, need to be again to permanent in circuit when being adjusted when needing to export electric current to LED, and then realizing the light modulation purpose to LED
Stream driving chip U1 or the first sampling resistor R6 is modified, and circuit realizes comparatively laborious complexity.Also, lead in the prior art
It crosses the circuit and is difficult to realize sectional dimming, limit the application range of LED.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
State the LED sectional dimming circuit of problem.
According to one aspect of the present invention, a kind of LED sectional dimming circuit is provided, including load LED, constant current drive core
Piece, further includes the sampling unit as the constant-current driven chip sampling resistor, and the sampling unit includes the first sampling resistor
R6 and at least one sample circuit, the sample circuit are connected in parallel with the first sampling resistor R6, wherein the sampling electricity
Road further includes another sampling resistor to be accessed；
Dim signal is accessed in the sample circuit, one end, and the other end is connect with the constant-current driven chip, for according to institute
It states dim signal and determines whether the sampling resistor to be accessed accesses circuit, to carry out sectional dimming to the load LED.
Optionally, when the sample circuit is one, the sample circuit is the first sample circuit,
First sample circuit includes corresponding concatenated second sampling resistor R7 and second switch Q2, and described second
The one end sampling resistor R7 and second switch Q2 drain electrode connect, and the other end is adopted with the end constant-current driven chip CS, first respectively
The connection of sample one end resistance R6, the first sampling resistor R6 other end ground connection, the second switch Q2 grid access first are adjusted
Optical signal and second switch Q2 source electrode ground connection.
Optionally, the second switch Q2 grid is also connect with first resistor R8, the one end second resistance R9 respectively, described
The first resistor R8 other end accesses first dim signal, the second resistance R9 other end and the source the second switch Q2
Pole connection.
Optionally, when first dim signal is high level, the second switch Q2 conducting, the constant current driving
The sampling resistor of chip is that the first sampling resistor R6 is in parallel with the second sampling resistor R7；
When first dim signal is low level, the second switch Q2 cut-off, the constant-current driven chip
Sampling resistor is the first sampling resistor R6.
Optionally, when the sample circuit be two when, the sample circuit further include with first sample circuit simultaneously
Second sample circuit of connection,
Second sample circuit includes corresponding concatenated third sampling resistor R10 and third switching tube Q3, and described the
Three one end sampling resistor R10 and third switching tube Q3 drain electrode connect, and the other end is connect with the end the constant-current driven chip CS,
The third switching tube Q3 grid accesses the second dim signal and third switching tube Q3 source electrode ground connection.
Optionally, the third switching tube Q3 grid is also connect with 3rd resistor R11, the 4th one end resistance R12 respectively, institute
It states the 3rd resistor R11 other end and accesses second dim signal, the 4th resistance R12 other end and the third switching tube
The connection of Q3 source electrode.
Optionally, when the sample circuit is n (n be greater than 2 positive integer) a, the sample circuit includes successively simultaneously
The first sample circuit, the second sample circuit to the n-th sample circuit of connection,
N-th sample circuit includes corresponding concatenated N (N is positive integer) sampling resistor RN and N switching tube QN,
Described one end sampling resistor RN N and N switching tube QN drain electrode connect, and the other end and the end the constant-current driven chip CS connect
It connects, the N switching tube QN grid accesses the n-th dim signal and N switching tube QN source electrode ground connection.
Optionally, the N switching tube QN grid is also connect with N1 resistance RN1, the one end N2 resistance RN2 respectively, institute
It states the N1 resistance RN1 other end and accesses n-th dim signal, the N2 resistance RN2 other end and the N switching tube QN
Source electrode connection.
Optionally, when the dim signal of any sample circuit is high level, the switching tube conducting of the sample circuit, institute
It states switching tube and corresponds to the concatenated sampling resistor access sample circuit；And
When the dim signal of any sample circuit is low level, the switching tube cut-off of the sample circuit, the switch
Pipe corresponds to concatenated sampling resistor and does not access the sample circuit；
The sampling resistor of the constant-current driven chip is that the sampling resistor and described first of each access sample circuit samples
Resistance R6 is in parallel.
Optionally, the switching tube is metal-oxide-semiconductor.
LED sectional dimming circuit provided by the invention, including load LED, constant-current driven chip, in addition, further including sampling
Unit, the sampling unit can be used as the sampling resistor of constant-current driven chip.The sampling unit is including the first sampling resistor R6 and extremely
A few sample circuit, the sample circuit added are connected in parallel with the first sampling resistor R6, wherein further include in sample circuit
Another sampling resistor to be accessed.Dim signal is accessed in above-mentioned sample circuit, one end, and the other end is connect with constant-current driven chip, uses
In determining whether the sampling resistor to be accessed accesses circuit according to dim signal, to carry out sectional dimming to load LED.Thus may be used
Know, the present invention adds sample circuit in circuit, and dim signal is accessed in sample circuit, and then passes through control light modulation letter
Number, the sampling resistor resistance value of constant-current driven chip is adjusted, to adjust the output electric current of load LED, to realize the tune of load LED
Light function.Which no longer needs to rely on constant-current driven chip, only can be realized LED's by controlling the dim signal of sample circuit
Sectional dimming function, it is at low cost, and be easily achieved, it is versatile.Also, the number of sample circuit of the present invention can be according to reality
Demand carries out customized setting, to realize load LED any section light modulation.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the LED drive circuit schematic diagram of buck framework；
Fig. 2 is the first schematic diagram of LED sectional dimming circuit according to an embodiment of the invention；
Fig. 3 is second of schematic diagram of LED sectional dimming circuit according to an embodiment of the invention；
Fig. 4 is the third schematic diagram of LED sectional dimming circuit according to an embodiment of the invention；And
Fig. 5 is the 4th kind of schematic diagram of LED sectional dimming circuit according to an embodiment of the invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
It refers in the related technology, the demand on current market to LED light modulation product is more and more extensive, however, existing
LED dimming arrangement, usually relatively relies on light modulation driving chip, which is difficult to accomplish versatility.For example,
Fig. 1 is the LED drive circuit schematic diagram of buck framework.As shown in Figure 1, the output electric current of LED by constant-current driven chip U1 and
First sampling resistor R6 is determined.Specifically, in the driving circuit, the output electric current for loading LED is ILED(see formula one):
Wherein, K is proportionality coefficient, and value is determined by constant-current driven chip U1 inner parameter, RCSThat is R6.At this point, when needing
To ILEDWhen being adjusted, constant-current driven chip U1 or the first sampling resistor R6 need to be modified again, circuit realization is compared
Very complicated.Also, the sectional dimming of LED is difficult to realize by the circuit in the prior art, limits the application range of LED.
In order to solve the above-mentioned technical problem, the embodiment of the invention provides a kind of LED sectional dimming circuits.The present embodiment
LED sectional dimming circuit includes load LED, constant-current driven chip U1 and the sampling as constant-current driven chip U1 sampling resistor
Unit.In the present embodiment, sampling unit includes the first sampling resistor R6 and at least one sample circuit, in addition, in this reality
It applies in each sample circuit of example, includes a sampling resistor to be accessed.
Fig. 2 is the first schematic diagram of LED sectional dimming circuit according to an embodiment of the invention.As shown in Fig. 2, working as
When sample circuit is one, for ease of description, which is known as the first sample circuit.In the present embodiment, first
Sample circuit includes the second sampling resistor R7 (sampling resistor to be accessed) and switching tube, and the second sampling resistor R7 and switch
Pipe is connected in series.In the present embodiment, switching tube can be metal-oxide-semiconductor, can also be triode etc., the present embodiment, which does not do this, to be had
Body limits.
Specifically, Fig. 3 also shows second of signal of LED sectional dimming circuit according to an embodiment of the invention
Figure.As shown in figure 3, in the present embodiment, switching tube uses metal-oxide-semiconductor.At this point, the first sample circuit includes the second sampling resistor R7
And second switch Q2, wherein the second sampling resistor R7 and second switch Q2 is to correspond and be connected in series, that is, is existed
In the sample circuit of the present embodiment, there are a switching tube i.e. correspondence, there are the sampling resistors of a series connection with it.Further, join
See Fig. 3, second one end sampling resistor R7 and second switch Q2 drain electrode connect, the other end respectively with the end constant-current driven chip CS,
The connection of first one end sampling resistor R6, first sampling resistor R6 other end ground connection, the first light modulation of second switch Q2 grid access
Signal (being indicated in figure with DIMMER1) and second switch Q2 source electrode ground connection.
In a preferred embodiment, second switch Q2 grid can also respectively with first resistor R8, second resistance
The connection of the one end R9, the first resistor R8 other end access the first dim signal, the second resistance R9 other end and the source second switch Q2
Pole connection.
As a result, in the LED sectional dimming circuit of the present embodiment, when the first dim signal is high level, second switch
Pipe Q2 conducting, the resistance value of the sampling resistor of constant-current driven chip are the first sampling resistor R6 resistance in parallel with the second sampling resistor R7
Value.The output electric current for loading LED is ILED1(see formula two):
When the first dim signal is low level, second switch Q2 cut-off, the resistance of the sampling resistor of constant-current driven chip
Value is the resistance value of the first sampling resistor R6.The output electric current for loading LED is ILED2(see formula three):
Seen from the above description, the present embodiment passes through the first dim signal high level of control (corresponding output electric current ILED1) or
Person's low level (corresponding output electric current ILED2), it can to load LED output electric current to be respectively ILED1、ILED2, realize load LED
Two sections light modulation.Further, by adjusting the resistance value of the first sampling resistor R6 and the second sampling resistor R7, it can also realize and appoint
Two sections of LED light modulation of meaning brightness.
Further, in order to realize that three sections even four sections of LED dim, in the present embodiment, Fig. 4 is also shown according to this
The third schematic diagram of the LED sectional dimming circuit of invention one embodiment.As shown in figure 4, sample circuit uses two.At this
In embodiment, when sample circuit is two, sample circuit includes the first sample circuit, further includes and above-mentioned first sample circuit
Second sample circuit in parallel.Second sample circuit include third sampling resistor R10 (another sampling resistor to be accessed) and
Third switching tube Q3, in the present embodiment, third sampling resistor R10 and third switching tube Q3 are to correspond and be connected in series
, i.e., in the sample circuit of the present embodiment, there are a switching tube i.e. correspondence, there are the sampling resistors of a series connection with it.Ginseng
See Fig. 4, third one end sampling resistor R10 and third switching tube Q3 drain electrode connect, and the other end is connect with the end constant-current driven chip CS,
Third switching tube Q3 grid access the second dim signal (being indicated in figure with DIMMER2) and third switching tube Q3 source electrode connect
Ground.
In a preferred embodiment, third switching tube Q3 grid can also respectively with 3rd resistor R11, the 4th resistance
The connection of the one end R12, the 3rd resistor R11 other end access the second dim signal, the 4th resistance R12 other end and third switching tube Q3
Source electrode connection.
As a result, in the LED sectional dimming circuit of the present embodiment, when the first dim signal is high level, the second light modulation letter
When number being high level, second switch Q2, third switching tube Q3 are both turned on, and the resistance value of the sampling resistor of constant-current driven chip is the
One sampling resistor R6, the second sampling resistor R7, the R10 parallel connection of third sampling resistor resistance value.The output electric current for loading LED is ILED3
(see formula four):
When the first dim signal is high level, the second dim signal is low level, second switch Q2 conducting, third are opened
Pipe Q3 cut-off is closed, the resistance value of the sampling resistor of constant-current driven chip is the first sampling resistor R6, the second sampling resistor R7 is in parallel
Resistance value.The output electric current for loading LED is ILED4(see formula five):
When the first dim signal is low level, the second dim signal is high level, second switch Q2 cut-off, third are opened
Pipe Q3 conducting is closed, the resistance value of the sampling resistor of constant-current driven chip is the first sampling resistor R6, third sampling resistor R10 is in parallel
Resistance value.The output electric current for loading LED is ILED5(see formula six):
When the first dim signal is low level, the second dim signal is low level, second switch Q2, third switching tube
Q3 is turned off, and the resistance value of the sampling resistor of constant-current driven chip is the resistance value of the first sampling resistor R6.Load the output electric current of LED
For ILED6(see formula seven):
Seen from the above description, the present embodiment passes through control the first dim signal, the second dim signal high level or low
Level can to load LED output electric current to be respectively ILED3、ILED4、ILED5、ILED6, realize tri- to four sections of LED light modulations of load.
Further, by adjusting the resistance value of the first sampling resistor R6, the second sampling resistor R7 and third sampling resistor R10, Ke Yishi
Three sections or four sections of LED light modulations of incumbent meaning brightness.
Similarly, the present embodiment can also carry out any expansion to LED sectional dimming circuit.Fig. 5 is one according to the present invention
4th kind of schematic diagram of the LED sectional dimming circuit of embodiment.As shown in figure 5, when sample circuit is that (n is just whole greater than 2 to n
Number) it is a when, sample circuit includes the first sample circuit successively in parallel, the second sample circuit to the n-th sample circuit.N-th sampling
Circuit includes one-to-one N sampling resistor RN (another sampling resistor to be accessed) and N switching tube QN, wherein N is adopted
Sample resistance RN and N switching tube QN are connected in series, and the one end sampling resistor RN N and N switching tube QN drain electrode connect, the other end
Connect with the end constant-current driven chip CS, N switching tube QN grid access the n-th dim signal (being indicated in figure with DIMMERn), with
And N switching tube QN source electrode ground connection.
In a preferred embodiment, N switching tube QN grid can also respectively with N1 resistance RN1, N2 resistance
The connection of the one end RN2, the N1 resistance RN1 other end access the n-th dim signal, the N2 resistance RN2 other end and the source N switching tube QN
Pole connection.It should be noted that in the present embodiment, " N sampling resistor ", " N switching tube ", " N1 resistance " and "
N2 resistance " only indicates the different names of sampling resistor, switching tube or resistance, and N value identical as n value can also be different,
The present embodiment has no other specific restrictions only for distinguishing to different components.
As a result, in the LED sectional dimming circuit of the present embodiment, when the first dim signal, the second dim signal to n-th are adjusted
When optical signal is low level, second switch Q2, third switching tube Q3 to N switching tube QN are turned off, constant-current driven chip
Sampling resistor resistance value be the first sampling resistor R6 resistance value.At this point, when the dim signal of any sample circuit switchs to high electricity
Usually, the switching tube conducting in the sample circuit, the switching tube correspond to concatenated sampling resistor access sample circuit, constant current driving
The resistance value of the sampling resistor of chip is the sampling resistor of each access sample circuit resistance in parallel with the first sampling resistor R6.When
When first dim signal, the second dim signal to the n-th dim signal are high level, second switch Q2, third switching tube Q3
It is both turned on to N switching tube QN, the resistance value of the sampling resistor of constant-current driven chip is the first sampling resistor R6, the second sampling resistor
R7, third sampling resistor R10 to the RN parallel connection of N sampling resistor resistance value.At this point, the dim signal when any sample circuit switchs to
When low level, the switching tube in the sample circuit ends, which corresponds to concatenated sampling resistor and no longer access sample circuit,
The sampling resistor and the first sampling resistor R6 that the resistance value of constant-current driven chip sampling resistor is remaining each access sample circuit are simultaneously
The resistance value of connection.
Seen from the above description, the present embodiment passes through the first dim signal of control, the second dim signal ... n-th light modulation letter
Number high level or low level, may be implemented load LED any section light modulation.Further, by adjusting in each sample circuit
Any section LED light modulation of any brightness may be implemented in the resistance value of each sampling resistor of corresponding access.
It should be noted that the present embodiment only carries out circuit theory explanation with the LED drive circuit of buck structure, but not
It is limited solely to buck structural circuit, the constant-current drive circuit of any circuit topological structure is applicable, and the present embodiment, which does not do this, to be had
Body limits.Also, in the present embodiment, the resistance value of the first sampling resistor R6 can be arbitrary value, according to actual circuit needs, such as
The resistance value of the first sampling resistor of fruit R6 is infinitely great, can be equivalent to the first sampling resistor R6 and cancel in circuit.
In addition, the LED sectional dimming circuit of the present embodiment, further includes first capacitor C1 and first switch tube Q1, referring to
Fig. 1-5 is one of any, it is seen then that and first capacitor C1 anode is connect with the end constant-current driven chip VCC, the 5th one end resistance R3 respectively,
Cathode is connect with the end constant-current driven chip GND, and the 5th resistance R3 other end is connect with the 6th one end resistance R2, and the 6th resistance R2 is another
One end is connect with 1 cathode of sustained diode.First switch tube Q1 grid connects with the 7th resistance R4, the 8th one end resistance R5 respectively
Connect, the 7th resistance R4 other end is connect with the end constant-current driven chip DRVER, the 8th resistance R5 other end respectively with first switch tube
Q1 source electrode, the connection of the end constant-current driven chip CS.
More, the LED sectional dimming circuit of the present embodiment further includes storage inductance L1 and output capacitance EC2, the storage
It deposits the one end inductance L1 to connect with LED load cathode, the other end and first switch tube Q1 drain electrode connect.Also, sustained diode 1
Anode is connected with first switch tube Q1 drain electrode, and cathode is connect with LED load anode.Output capacitance EC2 anode and LED load are just
Pole connection, cathode is connect with LED load cathode, and the both ends output capacitance EC2 are also parallel with the 9th resistance R1.
In addition, the LED sectional dimming circuit of the present embodiment further includes rectifier bridge DB1 and input capacitance EC1, the rectifier bridge
DB1 output end anode is connect with LED load anode, output end negativing ending grounding.Also, input capacitance EC1 anode and rectifier bridge
The connection of DB1 output end anode, cathode are connect with rectifier bridge DB1 output end negative terminal.In the present embodiment, rectifier bridge DB1 can be
One full-wave bridge rectifier circuit being made of four diodes, for the alternating current of fuse (referring to FUSE in figure) will to be passed through
Signal rectification is at DC signal.The common cathode of rectifier bridge DB1 extremely output end anode, electric current flow out from there, connect LED load
Anode, rectifier bridge DB1 common-anode ground connection.
It follows that the present invention adds sample circuit in circuit, and dim signal is accessed in sample circuit, Jin Ertong
Control dim signal is crossed, the sampling resistor resistance value of constant-current driven chip is adjusted, to adjust the output electric current of load LED, thus real
Now load the dimming function of LED.Which no longer needs to rely on constant-current driven chip, only passes through the dim signal of control sample circuit
The sectional dimming function of LED can be realized, it is at low cost, and be easily achieved, it is versatile.Also, of sample circuit of the present invention
Number can carry out customized setting according to actual needs, to realize load LED any section light modulation.More, of the invention to adopt
Sample circuit passes through the control further control switch pipe of dim signal by the way of corresponding to tandem tap pipe on sampling resistor
Conducting and cut-off, the final resistance value for controlling constant-current driven chip sampling resistor, circuit are simple, it is easy to accomplish.
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
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, those skilled in the art should understand that: at this
Within the spirit and principle of invention, it is still possible to modify the technical solutions described in the foregoing embodiments or right
Some or all of the technical features are equivalently replaced；And these are modified or replaceed, and do not make corresponding technical solution de-
From protection scope of the present invention.
Claims (10)
1. a kind of LED sectional dimming circuit, including load LED, constant-current driven chip, which is characterized in that further include as described
The sampling unit of constant-current driven chip sampling resistor, the sampling unit include the first sampling resistor R6 and at least one sampling electricity
Road, the sample circuit are connected in parallel with the first sampling resistor R6, wherein the sample circuit further includes another to be accessed
Sampling resistor；
Dim signal is accessed in the sample circuit, one end, and the other end is connect with the constant-current driven chip, for according to the tune
Optical signal determines whether the sampling resistor to be accessed accesses circuit, to carry out sectional dimming to the load LED.
2. LED sectional dimming circuit according to claim 1, which is characterized in that when the sample circuit is one, institute
Stating sample circuit is the first sample circuit,
First sample circuit includes corresponding concatenated second sampling resistor R7 and second switch Q2, second sampling
The one end resistance R7 and second switch Q2 drain electrode connect, and the other end is electric with the end constant-current driven chip CS, the first sampling respectively
Hinder the connection of the one end R6, the first sampling resistor R6 other end ground connection, the first light modulation of second switch Q2 grid access letter
Number and the second switch Q2 source electrode ground connection.
3. LED sectional dimming circuit according to claim 2, which is characterized in that the second switch Q2 grid also divides
It is not connect with first resistor R8, the one end second resistance R9, the first resistor R8 other end accesses first dim signal, institute
The second resistance R9 other end is stated to connect with the second switch Q2 source electrode.
4. LED sectional dimming circuit according to claim 3, which is characterized in that
When first dim signal is high level, the second switch Q2 conducting, the sampling of the constant-current driven chip
Resistance is that the first sampling resistor R6 is in parallel with the second sampling resistor R7；
When first dim signal is low level, the second switch Q2 cut-off, the sampling of the constant-current driven chip
Resistance is the first sampling resistor R6.
5. LED sectional dimming circuit according to claim 4, which is characterized in that when the sample circuit is two, institute
Stating sample circuit further includes second sample circuit in parallel with first sample circuit,
Second sample circuit includes that corresponding concatenated third sampling resistor R10 and third switching tube Q3, the third are adopted
Sample one end resistance R10 and third switching tube Q3 drain electrode connect, and the other end is connect with the end the constant-current driven chip CS, described
Third switching tube Q3 grid accesses the second dim signal and third switching tube Q3 source electrode ground connection.
6. LED sectional dimming circuit according to claim 5, which is characterized in that the third switching tube Q3 grid also divides
It is not connect with 3rd resistor R11, the 4th one end resistance R12,3rd resistor R11 other end access the second light modulation letter
Number, the 4th resistance R12 other end is connect with the third switching tube Q3 source electrode.
7. LED sectional dimming circuit according to claim 6, which is characterized in that when the sample circuit be n (n be greater than
2 positive integer) it is a when, the sample circuit includes the first sample circuit successively in parallel, the second sample circuit to the n-th sampling electricity
Road,
N-th sample circuit includes corresponding concatenated N (N is positive integer) sampling resistor RN and N switching tube QN, described
The one end sampling resistor RN N and N switching tube QN drain electrode connect, and the other end is connect with the end the constant-current driven chip CS,
The N switching tube QN grid accesses the n-th dim signal and N switching tube QN source electrode ground connection.
8. LED sectional dimming circuit according to claim 7, which is characterized in that the N switching tube QN grid is also distinguished
It is connect with N1 resistance RN1, the one end N2 resistance RN2, the N1 resistance RN1 other end accesses n-th dim signal, institute
The N2 resistance RN2 other end is stated to connect with the N switching tube QN source electrode.
9. according to the described in any item LED sectional dimming circuits of claim 5-8, which is characterized in that
When the dim signal of any sample circuit is high level, the switching tube conducting of the sample circuit, the switching tube pair
Concatenated sampling resistor is answered to access the sample circuit；And
When the dim signal of any sample circuit is low level, the switching tube cut-off of the sample circuit, the switching tube pair
Concatenated sampling resistor is answered not access the sample circuit；
The sampling resistor of the constant-current driven chip is the sampling resistor and first sampling resistor of each access sample circuit
R6 is in parallel.
10. LED sectional dimming circuit according to claim 9, which is characterized in that the switching tube is metal-oxide-semiconductor.
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| CN201810873292.8A CN109068441A (en) | 2018-08-02 | 2018-08-02 | A kind of LED sectional dimming circuit |
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| CN201810873292.8A CN109068441A (en) | 2018-08-02 | 2018-08-02 | A kind of LED sectional dimming circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114024461A (en) * | 2021-10-26 | 2022-02-08 | 广东汇芯半导体有限公司 | Inverter circuit based on semiconductor circuit and motor controller |
| CN114342562A (en) * | 2019-04-22 | 2022-04-12 | 萨万特系统公司 | Intelligent lighting control system multi-path scheme for switch base |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202050564U (en) * | 2011-02-17 | 2011-11-23 | 昂宝电子（上海）有限公司 | Dimmable LED (Light-emitting Diode) drive circuit |
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| CN114342562A (en) * | 2019-04-22 | 2022-04-12 | 萨万特系统公司 | Intelligent lighting control system multi-path scheme for switch base |
| CN114024461A (en) * | 2021-10-26 | 2022-02-08 | 广东汇芯半导体有限公司 | Inverter circuit based on semiconductor circuit and motor controller |
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