CN102548101A - LED dimming system - Google Patents
LED dimming system Download PDFInfo
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- CN102548101A CN102548101A CN2010106075376A CN201010607537A CN102548101A CN 102548101 A CN102548101 A CN 102548101A CN 2010106075376 A CN2010106075376 A CN 2010106075376A CN 201010607537 A CN201010607537 A CN 201010607537A CN 102548101 A CN102548101 A CN 102548101A
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/175—Controlling the light source by remote control
- H05B47/185—Controlling the light source by remote control via power line carrier transmission
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Abstract
The invention provides an LED dimming system, which comprises a centralized driving module and at least one LED module, wherein each LED module comprises at least one LED branch; the input end of the centralized driving module is connected with a power supply; the centralized driving module receives a control signal representing an adjusting instruction and is used for outputting a direct-current bus voltage to each LED module, wherein the direct-current bus voltage carries the adjusting instruction; and each LED module is used for detecting the adjusting instruction carried by the direct-current bus voltage and adjusting the current of the LED branch in the LED module according to the adjusting instruction. The LED dimming system disclosed by the invention only makes use of one centralized driving module, has a simple structure and is convenient to control, and thereby the whole system has lower cost.
Description
Technical field
The present invention relates to the light regulating technology field, particularly a kind of LED light adjusting system.
Background technology
The light adjusting system of LED illuminating lamp has been continued to use the light adjusting system of incandescent lamp at present, because the light adjusting system cost of incandescent lamp is lower.Referring to Fig. 1, this figure is the light adjusting system of LED illuminating lamp in the prior art.
The light adjusting system of this LED illuminating lamp comprises communication power supply 101, AC chopping dimmer 102, a n driver and n LED branch road.Wherein, n LED branch road is respectively A1, A2, until An.
The output of communication power supply 101 connects AC chopping dimmer 102; AC chopping dimmer 102 is used for unified driver to n parallel connection and carries out light modulation.The corresponding paths of LEDs branch road of each driver.
If it is inner that driver is arranged on the LED lamp source, can the LED lamp directly be linked in the existing incandescent lighting system, need not change existing wire laying mode.But will there be following shortcoming like this:
Each LED branch road all carries an AC/DC driver, will cause the circuit of whole light adjusting system complicated like this, controls also more complicated, increases the cost of entire circuit.
Summary of the invention
The technical problem that the present invention will solve provides a kind of LED light adjusting system, and circuit structure is simple, and control is convenient, and cost is low.
The embodiment of the invention provides a kind of LED light adjusting system, comprising: centralized driving module, at least one led module, each led module comprise at least one paths of LEDs branch road;
The input of centralized driving module connects power supply, and the centralized driving module receives the control signal that characterizes regulating command, is used to export DC bus-bar voltage and gives said each led module, and said DC bus-bar voltage carries said regulating command;
Said each led module is used to detect the said regulating command that said DC bus-bar voltage carries, and regulates the electric current of the LED branch road in this led module according to said regulating command.
Preferably, said regulating command is the amplitude or the AC ripple voltage of DC bus-bar voltage;
When said regulating command is the amplitude of DC bus-bar voltage, the different regulating command of different amplitude size representatives of said DC bus-bar voltage;
When said regulating command was AC ripple voltage, at least a characteristic parameter of said AC ripple voltage was represented regulating command.
Preferably, said centralized driving module comprises: voltage changer and output voltage controlling circuit;
Said output voltage controlling circuit is used to detect said DC bus-bar voltage and the control signal that receives said characterization control instruction, generates the adjusting control signal and exports to voltage changer;
The input of said voltage changer connects power supply, is used for giving each led module according to regulating control signal output DC bus-bar voltage.
Preferably, said output voltage controlling circuit comprises integrated transporting discharging, first divider resistance, second divider resistance, the 3rd resistance and compensating network;
The negative input end of said integrated transporting discharging connects the output negative terminal of voltage changer through the output plus terminal of first divider resistance connection voltage changer through second divider resistance;
The negative input end of said integrated transporting discharging connects the control signal of said characterization control instruction through the 3rd resistance;
The positive input terminal of said integrated transporting discharging connects reference voltage;
The output of said integrated transporting discharging connects said voltage changer as the output of this output voltage controlling circuit;
Be connected with said compensating network between the negative input end of said integrated transporting discharging and the output.
Preferably, said each led module comprises detection and change-over circuit and N LED branch road; N is a positive integer;
The color of the LED lamp in each LED branch road is identical, the corresponding constant-current circuit of each LED branch road;
Said detection and change-over circuit are used for detecting the regulating command that DC bus-bar voltage carries, and convert said regulating command into control signal corresponding and send to each constant-current circuit respectively;
Said constant-current circuit is used for for corresponding LED branch road constant electric current being provided according to said control signal.
Preferably, said constant-current circuit is Buck circuit, Boost circuit, Buck-Boost circuit, Flyback circuit, Forword circuit, bridge circuit, push-pull circuit or LLC resonant circuit.
Preferably, each led module comprises detection and change-over circuit, constant-current circuit, a N LED branch road and N control switch; N is a positive integer;
Control switch of each LED branch road two ends parallel connection;
The color of the LED lamp in each LED branch road is identical;
N in each led module LED branch road is cascaded, and the anode of the LED branch road after the series connection connects the positive output end of constant-current circuit, and negative electrode connects negative output terminal;
Detect and change-over circuit, be used for detecting the regulating command that DC bus-bar voltage carries, convert said regulating command into control signal and send to constant-current circuit; Perhaps, give each control switch with said regulating command transmit button signal;
Constant-current circuit is used for for the LED branch road after connecting constant current being provided according to said control signal.
Preferably, each led module comprises detection and change-over circuit, a N LED branch road, a N current-limiting circuit, a N current-limiting control circuit; N is a positive integer;
Each LED branch road is connected with a current-limiting circuit, the corresponding current-limiting control circuit of each current-limiting circuit;
All LED branch roads are connected in parallel on the two ends of DC bus-bar voltage;
Detect and change-over circuit, be used for detecting the regulating command that DC bus-bar voltage carries, convert said regulating command into control signal corresponding and send to each current-limiting control circuit respectively;
Current-limiting control circuit, the electric current of this LED branch road that is used to sample according to said control signal control current-limiting circuit, is regulated the electric current of this LED branch road.
Preferably, each said current-limiting circuit comprises adjustment pipe and sampling resistor,
Said adjustment pipe, sampling resistor and LED series connection;
The common port of said adjustment pipe and sampling resistor is connected an input of said current-limiting control circuit;
The output of current-limiting control circuit connects the control end of adjustment pipe.
Preferably, each led module also comprises a LED branch road, is connected the voltage changer output after said N the LED branch road parallel connection with after this LED branch road is connected.
Compared with prior art, the present invention has the following advantages:
LED light adjusting system provided by the invention comprises: centralized driving module, at least one led module, each led module comprise at least one paths of LEDs branch road; The input of centralized driving module connects power supply, and the centralized driving module receives the control signal that characterizes regulating command, is used to export DC bus-bar voltage and gives each led module, and DC bus-bar voltage carries said regulating command; Each led module is used to detect the regulating command that DC bus-bar voltage carries, and regulates the electric current of the LED branch road in this led module according to regulating command.LED light adjusting system provided by the invention only uses a centralized driving module, and is simple in structure, and control is convenient, and therefore, the cost of whole system is lower.
Description of drawings
Fig. 1 is the light adjusting system of LED illuminating lamp in the prior art;
Fig. 2 is that LED provided by the invention concentrates light adjusting system embodiment one structure chart;
Fig. 3 is the example structure figure of centralized driving module provided by the invention;
Fig. 4 is another example structure figure of centralized driving module provided by the invention;
Fig. 5 is regulating command embodiment one sketch map provided by the invention;
Fig. 6 is the another embodiment sketch map of regulating command provided by the invention;
Fig. 7 is another example structure figure of LED light adjusting system provided by the invention;
Fig. 8 is the example structure figure of led module provided by the invention;
Fig. 9 is the another example structure figure of LED light adjusting system provided by the invention;
Figure 10 is the another example structure figure of led module provided by the invention;
Figure 11 is another example structure figure of led module provided by the invention.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
Referring to Fig. 2, this figure is that LED provided by the invention concentrates light adjusting system embodiment one structure chart.
The LED light adjusting system that the embodiment of the invention provides comprises: centralized driving module 201, at least one led module, each led module comprise at least one paths of LEDs branch road;
Led module parallel connection as shown in Figure 2, all only shows first led module 202 and n led module 203 among Fig. 2.
The input of centralized driving module 201 connects power supply Vin, and centralized driving module 201 receives the control signal that characterizes regulating command, is used to export DC bus-bar voltage V1 and gives said each led module power supply, and said DC bus-bar voltage V1 carries said regulating command;
Need to prove that Vin can be alternating voltage, also can be direct voltage; When Vin was alternating voltage, centralized driving module 201 also had the function of rectification.
Said each led module is used to detect the said regulating command that said DC bus-bar voltage V1 carries, and regulates the electric current of the LED branch road in this led module according to said regulating command.
LED light adjusting system provided by the invention comprises: centralized driving module, at least one led module, each led module comprise at least one paths of LEDs branch road; The input of centralized driving module connects power supply, and the centralized driving module receives the control signal that characterizes regulating command, is used to export DC bus-bar voltage and gives each led module, and DC bus-bar voltage carries said regulating command; Each led module is used to detect the regulating command that DC bus-bar voltage carries, and regulates the electric current of the LED branch road in this led module according to regulating command.LED light adjusting system provided by the invention only uses a centralized driving module, and is simple in structure, and control is convenient, and therefore, the cost of whole system is lower.
Referring to Fig. 3, this figure is the example structure figure of centralized driving module provided by the invention.
The centralized driving module that present embodiment provides comprises: voltage changer 201a and output voltage controlling circuit 201b;
Said output voltage controlling circuit 201b is used to detect said DC bus-bar voltage V1 and the control signal V2 that receives said sign regulating command, generates the adjusting control signal and exports to voltage changer 201a;
The input of said voltage changer 201a connects power supply Vin, is used for giving each led module according to regulating control signal output DC bus-bar voltage V1.
The control signal V2 of said sign regulating command can be the signal from light-control knob device or remote controller generation, perhaps the standard interface signal of light adjusting system such as DALI, DMX.
Introduce the concrete implementation of output voltage controlling circuit 201b below in conjunction with Fig. 4, referring to Fig. 4, this figure is another example structure figure of centralized driving module provided by the invention.
Said output voltage controlling circuit 201b comprises integrated transporting discharging IC, the first divider resistance R1, the second divider resistance R2, the 3rd resistance R 3 and compensating network;
The negative input end of said comparator IC connects the output negative terminal of voltage changer 201a through the output plus terminal of first divider resistance R1 connection voltage changer 201a through the second divider resistance R2;
The negative input end of said integrated transporting discharging IC connects the control signal V2 of said characterization control instruction through the 3rd resistance R 3;
The positive input terminal of said integrated transporting discharging IC connects reference voltage V ref;
The output of said integrated transporting discharging IC connects said voltage changer 201a as the output of this output voltage controlling circuit 201b;
Be connected with said compensating network between the negative input end of said integrated transporting discharging IC and the output.
Said regulating command can be the amplitude or the AC ripple voltage of DC bus-bar voltage;
When said regulating command is the amplitude of DC bus-bar voltage, the different regulating command of different amplitude size representatives of said DC bus-bar voltage;
When said regulating command was AC ripple voltage, at least a characteristic parameter of said AC ripple voltage was represented regulating command.
The characteristic parameter of AC ripple voltage can be for the amplitude of AC ripple voltage, peak-to-peak value, frequency, duty ratio, high voltage time, low-voltage time etc. at least a.
Can regulating command be encoded the regulating command that the different coding representative is different according to predetermined coding rule.
Said AC ripple voltage can be pulse signal, sinusoidal signal, triangular signal or trapezoidal signal etc.
Specify the implementation of characteristic parameter that regulating command is respectively amplitude or the AC ripple voltage of DC bus-bar voltage below in conjunction with Fig. 5 and Fig. 6.
Referring to Fig. 5, this figure is regulating command embodiment one sketch map provided by the invention.
The amplitude that shown in Figure 5 is through DC bus-bar voltage detects regulating command.
Concrete implementation can for: through changing the amplitude of the control signal V2 that characterizes regulating command, change the amplitude of DC bus-bar voltage V1, thereby transmit regulating command to led module.
Need to prove that regulating command can comprise light modulation instruction and toning instruction, also can include only wherein a kind of.Wherein light modulation refers to adjusting brightness, and toning refers to the adjusting color.
The amplitude of hypothesis DC bus-bar voltage V1 both can have been transmitted the regulating command of regulating brightness now, can transmit the regulating command of regulating color again.
The magnitude scope of DC bus-bar voltage V1 can be divided into different subintervals, the different different regulating commands of subinterval representative.
For example, can the scope of V1 variation be divided into two sub-interval, the type of a regulating command is represented in each subinterval.
As shown in Figure 5, the magnitude scope of V1 is that (300V, 400V), it is divided into first subinterval, and (300V is 350V) with second subinterval (350V, 400V) two intervals.(300V is 350V) for regulating the interval of color to set first subinterval; (350V is 400V) for regulating the interval of brightness in second subinterval; Perhaps (300V is 350V) for regulating the interval of brightness in first subinterval; (350V is 400V) for regulating the interval of color in second subinterval.
It is understandable that the subinterval number that V1 magnitude scope is set can be set with each sub-interval length according to actual needs, not specifically restriction in the present embodiment.
In the interval of brightness is regulated in representative, can continue to divide a plurality of intervals, a brightness degree is represented in each interval; In the interval of color is regulated in representative, can continue to divide a plurality of intervals, a kind of color of each interval representative.
If be used for single light modulation or tinting system, then the amplitude of DC bus-bar voltage V1 only is used for transmitting single light modulation instruction or toning instruction, and its method and Fig. 5 are described similar for example.
Transmit the implementation of regulating command below in conjunction with Fig. 6 explanation stack AC ripple voltage on DC bus-bar voltage.
Referring to Fig. 6, this figure is the another embodiment sketch map of regulating command provided by the invention.
Characteristic parameter through AC ripple voltage in the present embodiment transmits regulating command.
Characteristic parameter with AC ripple voltage had both transmitted the regulating command of regulating brightness below, and transmitting the regulating command of regulating color again is that example is introduced.
For example, two characteristic parameters of the AC ripple voltage of the stack on the DC bus-bar voltage V1 transmit respectively to be regulated color and regulates brightness, for example sets the Frequency Transfer of AC ripple voltage and regulates color; Brightness is regulated in the duty ratio transmission of AC ripple voltage.
The lamp of the corresponding a kind of color of each Frequency point of AC ripple voltage or frequency band.In led module, set the current value of each corresponding LED branch road of every kind of color in advance.Led module detects after the frequency of the AC ripple voltage that superposes on the DC bus-bar voltage, searches the current value of each corresponding LED branch road of this frequency, thereby for each LED branch road the current corresponding value is provided.
A kind of in addition, the different brightness of the corresponding LED lamp of the different duty of AC ripple voltage.In led module, set the different brightness current corresponding values of LED lamp in advance; Led module detects after the duty ratio of AC ripple voltage of DC bus-bar voltage stack; Search the current value of each corresponding LED branch road of this duty ratio, thereby the current corresponding value is provided for each LED branch road.
As shown in Figure 6, only show the oscillogram of V2 and V1, wherein V2 is an impulse wave, V1 is the DC bus-bar voltage of AC ripple signal of having superposeed.As can be seen from Figure 6, the duty ratio of first regulating command correspondence is bigger than the duty ratio of second regulating command.
If be used for single light modulation or tinting system, any one characteristic parameter of AC ripple voltage only is used for transmitting the single toning or the regulating command of light modulation, and its method and Fig. 6 are described similar for example.
Introduce the led module in the LED light adjusting system provided by the invention in detail below in conjunction with accompanying drawing.
Referring to Fig. 7, this figure is another example structure figure of LED light adjusting system provided by the invention.
Each led module that present embodiment provides comprises detection and change-over circuit and N LED branch road; N is a positive integer;
As shown in Figure 7, only show two led modules wherein, be respectively first led module 202, a n led module 203.Each led module comprises three LED branch roads.
The color of the LED lamp in each LED branch road is identical, the corresponding constant-current circuit of each LED branch road; As shown in Figure 7, comprise three LED branch roads in first led module 202, represent with A1, A2 and A3 respectively.Comprise three LED branch roads in n the led module 203, represent with A4, A5 and A6 respectively.
Said detection and change-over circuit are used for detecting the regulating command that DC bus-bar voltage carries, and convert said regulating command into control signal corresponding and send to each constant-current circuit respectively.
As shown in Figure 7, the input of first detection and change-over circuit 202a connects DC bus-bar voltage V1, and output connects the control end of each constant-current circuit respectively.N detects and the input of change-over circuit 203a connects DC bus-bar voltage V1, and output connects the control end of each constant-current circuit respectively.
Said constant-current circuit is used for for corresponding LED branch road stable electric current being provided according to said control signal.
Said constant-current circuit can be Buck circuit, Boost circuit, Buck-Boost circuit, Flyback circuit, Forword circuit, bridge circuit, push-pull circuit or LLC resonant circuit.
As can be seen from Figure 7, corresponding constant-current circuit of each the LED branch road in each led module.
Need to prove that each led module can comprise at least one LED branch road, the above LED branch road of two-way can be the lamp with a kind of color, also can be the lamp of different colours; The color of the LED branch road in the different LED module can be identical or different.
Introduce the corresponding specific embodiment of Fig. 7 below in conjunction with Fig. 8.
Referring to Fig. 8, this figure is the example structure figure of led module provided by the invention.
Only showing the internal structure of a led module among Fig. 8, is a corresponding specific embodiment of Fig. 7.Because the internal structure of each led module among Fig. 7 is identical, therefore, be that first led module among Fig. 7 is that example is introduced with the led module among Fig. 8.
Constant-current circuit in the present embodiment specifically can be realized by the DC/DC circuit, specifically realized by the Buck circuit.
The output of detection and change-over circuit 202a connects the control circuit in each DC/DC circuit, and the output of control circuit connects switching tube S2, through the closed and disconnected of control S2, is set point thereby make the output current of Buck circuit.
When transmitting regulating command through the amplitude of DC bus-bar voltage; Said detection and change-over circuit 202a detect the amplitude of DC bus-bar voltage; And convert control DC/DC circuit control signal into, and realize control to every paths of LEDs branch current, thus whole color and the brightness of control led module.
When the AC ripple voltage through DC bus-bar voltage transmits regulating command; Said detection and change-over circuit 202a detect the characteristic parameter of AC ripple voltage; And convert control DC/DC circuit control signal into; Realization is to the control of every paths of LEDs branch current, thus whole color and the brightness of control led module.
Introduce the another kind of led module that the embodiment of the invention provides below, referring to Fig. 9, this figure is the another example structure figure of LED light adjusting system provided by the invention.
Each led module that present embodiment provides comprises detection and change-over circuit, constant-current circuit, a N LED branch road and N control switch; N is a positive integer;
Control switch of each LED branch road two ends parallel connection;
N in each led module LED branch road is cascaded, and the anode of the LED branch road after the series connection connects the positive output end of constant-current circuit, and negative electrode connects negative output terminal;
Detect and change-over circuit, be used for detecting the regulating command that DC bus-bar voltage carries, convert said regulating command into control signal and send to constant-current circuit; Perhaps, give each control switch with said regulating command transmit button signal;
Constant-current circuit is used for for the LED branch road after connecting constant current being provided according to said control signal.
First led module 202 as shown in Figure 9 comprises three LED branch roads, is respectively R, G and B, and the color of the LED lamp in each LED branch road is identical.Wherein the LED lamp of R string is that the LED lamp red, that G goes here and there is yellow for LED lamp green, the B string.
R string LED lamp is parallelly connected with the first control switch Sr1; G string LED lamp is parallelly connected with the second control switch Sr2; R string LED lamp is parallelly connected with the 3rd control switch Sr3;
Constant-current circuit can be the circuit of non-isolation type, like Buck, and Boost, or circuit such as Buck-Boost; Can be the circuit of isolated form also, like Flyback, Forword, bridge circuit, push-pull circuit, or LLC class resonant circuit etc.
Detect and change-over circuit, detect the characteristic parameter of the regulating command of carrying of DC bus-bar voltage, give control switch Sr1, Sr2, Sr3 and constant-current circuit according to predefined characteristic parameter coding rule output control signal.
Detection and change-over circuit can be controlled the current amplitude of its output, the total brightness of promptly regulating led module through the control constant-current circuit; Can be through the closed and disconnected of control control switch Sr1, Sr2, Sr3, control the duty ratio between the electric current of R string LED lamp, G string LED lamp, B string LED lamp indirectly.
The total brightness that detection and change-over circuit are regulated led module through the mean value of control led module total current.
Detection and change-over circuit are through controlling the closed and disconnected of control switch Sr1, Sr2, Sr3 respectively; Control the duty ratio between the electric current of R string LED lamp, G string LED lamp, B string LED lamp respectively, thereby the current average of controlling the lamp of every kind of color is regulated the integral color of led module.
Need to prove that present embodiment is to comprise R, G and B three string LED lamp, i.e. three LED branch roads in the led module; Can also be: two or more LED branch roads, in the same led module, different LED branch roads can be the lamp with a kind of color, also can be the lamp of different colours; The color of the LED branch road in the different LED module can be identical or different.
Referring to Figure 10, this figure is the another example structure figure of led module provided by the invention.
Shown in Figure 10 is the cut-away view of first led module, because the structure of each led module is identical, therefore, is that example is introduced with first led module only.
The constant-current circuit that Figure 10 provides adopts the Buck circuit of non-isolation type to realize.
Referring to Figure 11, this figure is another example structure figure of led module provided by the invention.
Each led module comprises detection and change-over circuit, a N LED branch road, a N current-limiting circuit, a N current-limiting control circuit; N is a positive integer;
Each LED branch road is connected with a current-limiting circuit, the corresponding current-limiting control circuit of each current-limiting circuit;
All LED branch roads are connected in parallel on the two ends of DC bus-bar voltage;
Detect and change-over circuit, be used for detecting the regulating command that DC bus-bar voltage carries, convert said regulating command into control signal corresponding and send to each current-limiting control circuit respectively;
Current-limiting control circuit, the electric current of this LED branch road that is used to sample according to said control signal control current-limiting circuit, is regulated the electric current of this LED branch road.
Shown in figure 11, be that example is introduced with three LED branch roads, be respectively R branch road, G branch road and B branch road.The corresponding a kind of color of each branch road.
The structure chart of each LED branch road is similarly, is that example is introduced with the R branch road only below.
Current-limiting control circuit 202b gathers the electric current of R branch road; Specifically can realize through sampling resistor Rs1; Receive the control signal Iset1 of detection and change-over circuit 202a simultaneously; Electric current of gathering and Iset1 are compared, and the resistance sizes of pipe S1 is adjusted in the control of output control signal, thereby controls the electric current of R branch road.
Shown in figure 11, current-limiting circuit 202c comprises adjustment pipe S1 and sampling resistor Rs1,
Said adjustment pipe S1, sampling resistor Rs1 and LED series connection;
The common port of said adjustment pipe S1 and sampling resistor Rs1 is connected the input of said current-limiting control circuit 202b;
The output of current-limiting control circuit 202b connects the control end of adjustment pipe S1.
Need to prove that each led module can also comprise a LED branch road, be connected the voltage changer output after said N the LED branch road parallel connection with after this LED branch road is connected.
Shown in figure 11, connect with the W branch road after the R branch road in first led module 202, G branch road and the parallel connection of B branch road.
The LED light adjusting system that the above embodiment of the present invention provides uses a concentrated light-adjusting module to make whole system realize higher power factor in grid side, thereby can reduce electromagnetic interference.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art; Do not breaking away under the technical scheme scope situation of the present invention; All the method for above-mentioned announcement capable of using and technology contents are made many possible changes and modification to technical scheme of the present invention, or are revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical scheme of the present invention, all still belongs in the scope of technical scheme protection of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. a LED light adjusting system is characterized in that, comprising: centralized driving module, at least one led module, each led module comprise at least one paths of LEDs branch road;
The input of said centralized driving module connects power supply, and said centralized driving module is used to receive the control signal that characterizes regulating command, and the output DC bus-bar voltage is given said each led module, and said DC bus-bar voltage carries said regulating command;
Said each led module is used to detect the said regulating command that said DC bus-bar voltage carries, and regulates the electric current of the LED branch road in this led module according to said regulating command.
2. LED light adjusting system according to claim 1 is characterized in that, said regulating command is the amplitude or the AC ripple voltage of DC bus-bar voltage;
When said regulating command is the amplitude of DC bus-bar voltage, the different regulating command of different amplitude size representatives of said DC bus-bar voltage;
When said regulating command was AC ripple voltage, at least a characteristic parameter of said AC ripple voltage was represented regulating command.
3. LED light adjusting system according to claim 1 and 2 is characterized in that, said centralized driving module comprises: voltage changer and output voltage controlling circuit;
Said output voltage controlling circuit is used to detect said DC bus-bar voltage and the control signal that receives said characterization control instruction, generates the adjusting control signal and exports to voltage changer;
The input of said voltage changer connects power supply, is used for giving each led module according to regulating control signal output DC bus-bar voltage.
4. LED light adjusting system according to claim 3 is characterized in that, said output voltage controlling circuit comprises integrated transporting discharging, first divider resistance, second divider resistance, the 3rd resistance and compensating network;
The negative input end of said integrated transporting discharging connects the output negative terminal of voltage changer through the output plus terminal of first divider resistance connection voltage changer through second divider resistance;
The negative input end of said integrated transporting discharging connects the control signal of said characterization control instruction through the 3rd resistance;
The positive input terminal of said integrated transporting discharging connects reference voltage;
The output of said integrated transporting discharging connects said voltage changer as the output of this output voltage controlling circuit;
Be connected with said compensating network between the negative input end of said integrated transporting discharging and the output.
5. LED light adjusting system according to claim 1 is characterized in that, said each led module comprises detection and change-over circuit and N LED branch road; N is a positive integer;
The color of the LED lamp in each LED branch road is identical, the corresponding constant-current circuit of each LED branch road;
Said detection and change-over circuit are used for detecting the regulating command that DC bus-bar voltage carries, and convert said regulating command into control signal corresponding and send to each constant-current circuit respectively;
Said constant-current circuit is used for for corresponding LED branch road constant electric current being provided according to said control signal.
6. light adjusting system according to claim 5 is characterized in that, said constant-current circuit is Buck circuit, Boost circuit, Buck-Boost circuit, Flyback circuit, Forword circuit, bridge circuit, push-pull circuit or LLC resonant circuit.
7. light adjusting system according to claim 1 is characterized in that, each led module comprises detection and change-over circuit, constant-current circuit, a N LED branch road and N control switch; N is a positive integer;
Control switch of each LED branch road two ends parallel connection;
The color of the LED lamp in each LED branch road is identical;
N in each led module LED branch road is cascaded, and the anode of the LED branch road after the series connection connects the positive output end of constant-current circuit, and negative electrode connects negative output terminal;
Detect and change-over circuit, be used for detecting the regulating command that DC bus-bar voltage carries, convert said regulating command into control signal and send to constant-current circuit; Perhaps, give each control switch with said regulating command transmit button signal;
Constant-current circuit is used for for the LED branch road after connecting constant current being provided according to said control signal.
8. light adjusting system according to claim 1 is characterized in that, each led module comprises detection and change-over circuit, a N LED branch road, a N current-limiting circuit, a N current-limiting control circuit; N is a positive integer;
Each LED branch road is connected with a current-limiting circuit, the corresponding current-limiting control circuit of each current-limiting circuit;
All LED branch roads are connected in parallel on the two ends of DC bus-bar voltage;
Detect and change-over circuit, be used for detecting the regulating command that DC bus-bar voltage carries, convert said regulating command into control signal corresponding and send to each current-limiting control circuit respectively;
Current-limiting control circuit, the electric current of this LED branch road that is used to sample according to said control signal control current-limiting circuit, is regulated the electric current of this LED branch road.
9. light adjusting system according to claim 8 is characterized in that, each said current-limiting circuit comprises adjustment pipe and sampling resistor,
Said adjustment pipe, sampling resistor and LED series connection;
The common port of said adjustment pipe and sampling resistor is connected an input of said current-limiting control circuit;
The output of current-limiting control circuit connects the control end of adjustment pipe.
10. according to Claim 8 or 9 described light adjusting systems, it is characterized in that each led module also comprises a LED branch road, be connected the voltage changer output after said N the LED branch road parallel connection with after this LED branch road is connected.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010607537.6A CN102548101B (en) | 2010-12-27 | 2010-12-27 | LED dimming system |
| PCT/CN2011/079381 WO2012088920A1 (en) | 2010-12-27 | 2011-09-06 | Led dimming system |
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| CN103108462A (en) * | 2013-01-25 | 2013-05-15 | 深圳麦格米特电气股份有限公司 | Dimming method of light emitting diode (LED) street lamp |
| CN103220864A (en) * | 2013-04-25 | 2013-07-24 | 苏州索服电子科技有限公司 | Intensively power-supplied light-emitting diode (LED) dimming system |
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| CN101494938A (en) * | 2009-02-19 | 2009-07-29 | 英飞特电子（杭州）有限公司 | Centralization type light change circuit for LED illuminating system |
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| RU2662231C2 (en) * | 2012-11-26 | 2018-07-25 | Филипс Лайтинг Холдинг Б.В. | Signal-level based control of power grid load systems |
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| CN103220864A (en) * | 2013-04-25 | 2013-07-24 | 苏州索服电子科技有限公司 | Intensively power-supplied light-emitting diode (LED) dimming system |
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| CN105025632A (en) * | 2015-07-30 | 2015-11-04 | 深圳市芯飞凌半导体有限公司 | Light-emitting diode (LED) lamp capable of color modulation by switches and control circuit thereof |
| EP3142465A3 (en) * | 2015-09-14 | 2017-05-03 | Hamilton Sundstrand Corporation | Hue and dimming control circuits for lamps or led arrays |
| CN106061041A (en) * | 2016-07-20 | 2016-10-26 | 杭州士兰微电子股份有限公司 | LED light modulator, LED light modulation method and LED driving device |
| CN106061041B (en) * | 2016-07-20 | 2019-09-13 | 杭州士兰微电子股份有限公司 | LED light adjusting system and LED light-dimming method |
| CN107949101A (en) * | 2017-11-17 | 2018-04-20 | 出门问问信息科技有限公司 | Method, apparatus, rearview mirror and the storage medium of LED light brightness Multistage Control |
| CN111901934A (en) * | 2019-05-06 | 2020-11-06 | 广州彩熠灯光股份有限公司 | Multi-path LED constant current driving circuit with same color |
| CN111901934B (en) * | 2019-05-06 | 2023-02-03 | 广州彩熠灯光股份有限公司 | Multi-path LED constant current driving circuit with same color |
| CN111050443A (en) * | 2019-12-27 | 2020-04-21 | 江苏玖盛电器有限公司 | Centralized power supply dimming control system for lighting lamps in passenger room of high-speed rail/subway train |
| WO2021249510A1 (en) * | 2020-06-11 | 2021-12-16 | 深圳光峰科技股份有限公司 | Power source and light source system |
| CN114173445A (en) * | 2021-11-29 | 2022-03-11 | 四维生态科技（杭州）有限公司 | Spectrum adjusting system and method based on voltage modulation |
| CN114173445B (en) * | 2021-11-29 | 2023-12-22 | 四维生态科技（杭州）有限公司 | Spectrum adjusting system and method based on voltage modulation |
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| Publication number | Publication date |
|---|---|
| CN102548101B (en) | 2014-05-28 |
| WO2012088920A1 (en) | 2012-07-05 |
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