CN102548101B - LED dimming system - Google Patents

LED dimming system Download PDF

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Publication number
CN102548101B
CN102548101B CN201010607537.6A CN201010607537A CN102548101B CN 102548101 B CN102548101 B CN 102548101B CN 201010607537 A CN201010607537 A CN 201010607537A CN 102548101 B CN102548101 B CN 102548101B
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CN
China
Prior art keywords
circuit
led
current
branch road
voltage
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CN201010607537.6A
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Chinese (zh)
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CN102548101A (en
Inventor
华桂潮
姜熠
葛良安
柳杨
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英飞特电子(杭州)股份有限公司
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Priority to CN201010607537.6A priority Critical patent/CN102548101B/en
Publication of CN102548101A publication Critical patent/CN102548101A/en
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Publication of CN102548101B publication Critical patent/CN102548101B/en

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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B47/00Circuit arrangements for operating light sources in general, i.e. where the type of the light source is not relevant
    • H05B47/10Controlling the light source
    • H05B47/175Controlling the light source by remote control
    • H05B47/185Controlling the light source by remote control via power line carrier transmission

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

A kind of LED light adjusting system

Technical field

The present invention relates to 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 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 carries out light modulation for unified to n driver in parallel.The corresponding paths of LEDs branch road of each driver.

If driver is arranged on to LED lamp source inside, LED lamp directly can be linked in existing incandescent lighting system, do not need to change existing wire laying mode.But will there is so following shortcoming:

Each LED branch road all carries an AC/DC driver, by causing the circuit of whole light adjusting system more complicated, controls also more complicated like this, increases the cost of whole circuit.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of LED light adjusting system, and circuit structure is simple, and it is convenient to control, and cost is low.

The embodiment of the present invention provides a kind of LED light adjusting system, comprising: centralized driving module, at least one LED module, and each LED module comprises at least one paths of LEDs branch road;

The input of centralized driving module connects power supply, and centralized driving module receives the control signal that characterizes regulating command, and for exporting DC bus-bar voltage to described each LED module, described DC bus-bar voltage is carried described regulating command;

Described each LED module, the described regulating command of carrying for detection of described DC bus-bar voltage, regulates the electric current of the LED branch road in this LED module according to described regulating command.

Preferably, the amplitude that described regulating command is DC bus-bar voltage or AC ripple voltage;

In the time of amplitude that described regulating command is DC bus-bar voltage, the different amplitude sizes of described DC bus-bar voltage represent different regulating commands;

In the time that described regulating command is AC ripple voltage, at least one characteristic parameter of described AC ripple voltage represents regulating command.

Preferably, described centralized driving module comprises: voltage changer and output voltage controlling circuit;

Described output voltage controlling circuit, for detection of the control signal of described DC bus-bar voltage and the described characterization control instruction of reception, generates and regulates control signal to export to voltage changer;

The input of described voltage changer connects power supply, for giving each LED module according to adjusting control signal output DC bus-bar voltage.

Preferably, described output voltage controlling circuit comprises integrated transporting discharging, the first divider resistance, the second divider resistance, the 3rd resistance and compensating network;

The negative input end of described integrated transporting discharging connects the output plus terminal of voltage changer by the first divider resistance, connect the output negative terminal of voltage changer by the second divider resistance;

The negative input end of described integrated transporting discharging connects the control signal of described characterization control instruction by the 3rd resistance;

The positive input terminal of described integrated transporting discharging connects reference voltage;

The output of described integrated transporting discharging connects described voltage changer as the output of this output voltage controlling circuit;

Between the negative input end of described integrated transporting discharging and output, be connected with described compensating network.

Preferably, described each LED module comprises detection and change-over circuit and N LED branch road; N is 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;

Described detection and change-over circuit, for detection of the regulating command of carrying in DC bus-bar voltage, be converted to corresponding control signal by described regulating command and send to respectively each constant-current circuit;

Described constant-current circuit, for providing constant electric current according to described control signal for corresponding LED branch road.

Preferably, described 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 positive integer;

Each LED branch road two ends control switch in parallel;

The color of the LED lamp in each LED branch road is identical;

N in each LED module LED branch road is cascaded, the positive output end of the anodic bonding constant-current circuit of the LED branch road after series connection, and negative electrode connects negative output terminal;

Detect and change-over circuit, for detection of the regulating command of carrying in DC bus-bar voltage, described regulating command is converted to control signal and sends to constant-current circuit; Or, give each control switch by described regulating command transmit button signal;

Constant-current circuit, for according to described control signal for series connection after LED branch road constant current is provided.

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 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 circuit parallel connections are at the two ends of DC bus-bar voltage;

Detect and change-over circuit, for detection of the regulating command of carrying in DC bus-bar voltage, described regulating command is converted to corresponding control signal and sends to respectively each current-limiting control circuit;

Current-limiting control circuit, for the electric current of this LED branch road of sampling, according to described control signal control current-limiting circuit, regulates the electric current of this LED branch road.

Preferably, each described current-limiting circuit comprises adjusts pipe and sampling resistor,

Described adjustment pipe, sampling resistor and LED series connection;

The common port of described adjustment pipe and sampling resistor is connected an input of described current-limiting control circuit;

The output of current-limiting control circuit connects the control end of adjusting pipe.

Preferably, each LED module also comprises a LED branch road, after connecting, is connected to voltage changer output after described N LED branch circuit parallel connection with this LED branch road.

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, and each LED module comprises at least one paths of LEDs branch road; The input of centralized driving module connects power supply, and centralized driving module receives the control signal that characterizes regulating command, and for exporting DC bus-bar voltage to each LED module, DC bus-bar voltage is carried described regulating command; Each LED module, the regulating command of carrying for detection of DC bus-bar voltage, 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, simple in structure, and it is convenient to control, and therefore, the cost of whole system is lower.

Accompanying drawing explanation

Fig. 1 is the light adjusting system of LED illuminating lamp in prior art;

Fig. 2 is that LED provided by the invention concentrates light adjusting system embodiment mono-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 mono-schematic diagram provided by the invention;

Fig. 6 is the another embodiment schematic diagram 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 above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.

Referring to Fig. 2, this figure is that LED provided by the invention concentrates light adjusting system embodiment mono-structure chart.

The LED light adjusting system that the embodiment of the present invention provides, comprising: centralized driving module 201, at least one LED module, and each LED module comprises at least one paths of LEDs branch road;

As shown in Figure 2, all LED module parallel connections, only show first LED module 202 and n LED module 203 in 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, and for exporting DC bus-bar voltage V1 to described each LED module power supply, described DC bus-bar voltage V1 carries described regulating command;

It should be noted that, Vin can be alternating voltage, can be also direct voltage; In the time that Vin is alternating voltage, centralized driving module 201 also has the function of rectification.

Described each LED module, the described regulating command of carrying for detection of described DC bus-bar voltage V1, regulates the electric current of the LED branch road in this LED module according to described regulating command.

LED light adjusting system provided by the invention comprises: centralized driving module, at least one LED module, and each LED module comprises at least one paths of LEDs branch road; The input of centralized driving module connects power supply, and centralized driving module receives the control signal that characterizes regulating command, and for exporting DC bus-bar voltage to each LED module, DC bus-bar voltage is carried described regulating command; Each LED module, the regulating command of carrying for detection of DC bus-bar voltage, 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, simple in structure, and it is convenient to control, 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 the present embodiment provides comprises: voltage changer 201a and output voltage controlling circuit 201b;

Described output voltage controlling circuit 201b, for detection of the control signal V2 of described DC bus-bar voltage V1 and the described sign regulating command of reception, generates and regulates control signal to export to voltage changer 201a;

The input of described voltage changer 201a connects power supply Vin, for giving each LED module according to adjusting control signal output DC bus-bar voltage V1.

The control signal V2 of described sign regulating command can be the signal producing from light-control knob device or remote controller, or the standard interface signal of the light adjusting system such as DALI, DMX.

Introduce the specific 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.

Described 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 described comparator IC connects the output plus terminal of voltage changer 201a by the first divider resistance R1, connect the output negative terminal of voltage changer 201a by the second divider resistance R2;

The negative input end of described integrated transporting discharging IC connects the control signal V2 of described characterization control instruction by the 3rd resistance R 3;

The positive input terminal of described integrated transporting discharging IC connects reference voltage V ref;

The output of described integrated transporting discharging IC connects described voltage changer 201a as the output of this output voltage controlling circuit 201b;

Between the negative input end of described integrated transporting discharging IC and output, be connected with described compensating network.

Described regulating command can be amplitude or the AC ripple voltage of DC bus-bar voltage;

In the time of amplitude that described regulating command is DC bus-bar voltage, the different amplitude sizes of described DC bus-bar voltage represent different regulating commands;

In the time that described regulating command is AC ripple voltage, at least one characteristic parameter of described AC ripple voltage represents regulating command.

The characteristic parameter of AC ripple voltage can be at least one of amplitude, peak-to-peak value, frequency, duty ratio, high voltage time, low-voltage time of AC ripple voltage etc.

Regulating command can be encoded according to predetermined coding rule, different codings represents different regulating commands.

Described AC ripple voltage can be pulse signal, sinusoidal signal, triangular signal or trapezoidal signal etc.

Illustrate regulating command and be respectively the implementation of the amplitude of DC bus-bar voltage or the characteristic parameter of AC ripple voltage below in conjunction with Fig. 5 and Fig. 6.

Referring to Fig. 5, this figure is regulating command embodiment mono-schematic diagram provided by the invention.

Shown in Fig. 5 is to detect regulating command by the amplitude of DC bus-bar voltage.

Specific implementation can be: characterize the amplitude of the control signal V2 of regulating command by change, change the amplitude of DC bus-bar voltage V1, thereby transmit regulating command to LED module.

It should be noted that, regulating command can comprise light modulation instruction and toning instruction, also can only include one wherein.Wherein light modulation refers to brightness adjusting, and toning refers to adjustable colors.

The regulating command that the amplitude of hypothesis DC bus-bar voltage V1 both can have been transmitted brightness adjusting now, the regulating command that can transmit again adjustable colors.

The amplitude excursion of DC bus-bar voltage V1 can be divided into different subintervals, and different subintervals represents different regulating commands.

For example, the scope that V1 can be changed, is divided into two subintervals, and each subinterval represents the type of a regulating command.

As shown in Figure 5, the amplitude excursion of V1 is (300V, 400V), is divided into the first subinterval (300V, 350V) and interval, two, the second subinterval (350V, 400V).Set the interval that the first subinterval (300V, 350V) is adjustable colors; The interval that the second subinterval (350V, 400V) is brightness adjusting; Or the interval that the first subinterval (300V, 350V) is brightness adjusting; The interval that the second subinterval (350V, 400V) is adjustable colors.

Be understandable that, subinterval number and each subinterval length that V1 amplitude excursion is set can be set according to actual needs, not specifically restriction in the present embodiment.

In the interval that represents brightness adjusting, can continue to divide multiple intervals, each interval represents a brightness degree; In the interval that represents adjustable colors, can continue to divide multiple intervals, each interval represents a kind of color.

If for single light modulation or tinting system, the amplitude of DC bus-bar voltage V1 is only used for transmitting single light modulation instruction or toning instruction, similar for example described in its method and Fig. 5.

Illustrate that below in conjunction with Fig. 6 the AC ripple voltage that superposes transmits the implementation of regulating command in DC bus-bar voltage.

Referring to Fig. 6, this figure is the another embodiment schematic diagram of regulating command provided by the invention.

In the present embodiment, transmit regulating command by the characteristic parameter of AC ripple voltage.

Both transmitted the regulating command of brightness adjusting below with the characteristic parameter of AC ripple voltage, the regulating command of transmitting again adjustable colors is that example is introduced.

For example, two characteristic parameters of the AC ripple voltage of the stack on DC bus-bar voltage V1 transmit respectively adjustable colors and brightness adjusting, for example, set the Frequency Transfer adjustable colors of AC ripple voltage; The duty ratio of AC ripple voltage is transmitted brightness adjusting.

The lamp of the corresponding a kind of color of each Frequency point of AC ripple voltage or frequency band.In LED module, set in advance the current value of each LED branch road corresponding to every kind of color.After LED module detects the frequency of the AC ripple voltage superposeing in DC bus-bar voltage, search the current value of each LED branch road corresponding to this frequency, thereby provide corresponding current value for each LED branch road.

Another, the different brightness of the corresponding LED lamp of different duty of AC ripple voltage.In LED module, set in advance the current value corresponding to different brightness of LED lamp, after LED module detects the duty ratio of AC ripple voltage of DC bus-bar voltage stack, search the current value of each LED branch road corresponding to this duty ratio, thereby provide corresponding current value for each LED branch road.

As shown in Figure 6, only show the oscillogram of V2 and V1, wherein V2 is impulse wave, and V1 is the DC bus-bar voltage of AC ripple signal of having superposeed.As can be seen from Figure 6, duty ratio corresponding to the first regulating command is larger than the duty ratio of the second regulating command.

If for single light modulation or tinting system, any one characteristic parameter of AC ripple voltage is only used for transmitting single toning or the regulating command of light modulation, similar for example described in its method and Fig. 6.

Introduce in detail the LED module in LED light adjusting system provided by the invention 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 the present embodiment provides comprises detection and change-over circuit and N LED branch road; N is positive integer;

As shown in Figure 7, only showing two LED modules wherein, is 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, first LED module 202 comprises three LED branch roads, represents respectively with A1, A2 and A3.N LED module 203 comprises three LED branch roads, represents respectively with A4, A5 and A6.

Described detection and change-over circuit, for detection of the regulating command of carrying in DC bus-bar voltage, be converted to corresponding control signal by described regulating command and send to respectively each constant-current circuit.

As shown in Figure 7, the input of the first detection and change-over circuit 202a connects DC bus-bar voltage V1, and output connects respectively the control end of each constant-current circuit.N detects and the input of change-over circuit 203a connects DC bus-bar voltage V1, and output connects respectively the control end of each constant-current circuit.

Described constant-current circuit, for providing stable electric current according to described control signal for corresponding LED branch road.

Described 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, the corresponding constant-current circuit of the each LED branch road in each LED module.

It should be noted that, each LED module can comprise at least one LED branch road, and LED branch road more than two-way can be the lamp of same color, can be also the lamp of different colours; The color of the LED branch road in different LED module can be identical or different.

Introduce below in conjunction with Fig. 8 the specific embodiment that Fig. 7 is corresponding.

Referring to Fig. 8, the example structure figure that this figure is LED module provided by the invention.

In Fig. 8, only showing the internal structure of a LED module, is the specific embodiment that Fig. 7 is corresponding.Because the internal structure of the each LED module in Fig. 7 is identical, therefore, being first LED module in Fig. 7 take the LED module in Fig. 8 is introduced as example.

Constant-current circuit in the present embodiment specifically can be realized by DC/DC circuit, is specifically realized by Buck circuit.

The output of detection and change-over circuit 202a connects the control circuit in each DC/DC circuit, and the output connecting valve pipe S2 of control circuit, by controlling the closed and disconnected of S2, is set point thereby make the output current of Buck circuit.

In the time that the amplitude by DC bus-bar voltage is transmitted regulating command, described detection and change-over circuit 202a detect the amplitude of DC bus-bar voltage, and be converted to the control signal of controlling DC/DC circuit, realize the control to every paths of LEDs branch current, thereby control color and the brightness of LED module entirety.

In the time that the AC ripple voltage by DC bus-bar voltage transmits regulating command, described detection and change-over circuit 202a detect the characteristic parameter of AC ripple voltage, and be converted to the control signal of controlling DC/DC circuit, realize the control to every paths of LEDs branch current, thereby control color and the brightness of LED module entirety.

Introduce the another kind of LED module that the embodiment of the present 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 the present embodiment provides comprises detection and change-over circuit, constant-current circuit, a N LED branch road and N control switch; N is positive integer;

Each LED branch road two ends control switch in parallel;

N in each LED module LED branch road is cascaded, the positive output end of the anodic bonding constant-current circuit of the LED branch road after series connection, and negative electrode connects negative output terminal;

Detect and change-over circuit, for detection of the regulating command of carrying in DC bus-bar voltage, described regulating command is converted to control signal and sends to constant-current circuit; Or, give each control switch by described regulating command transmit button signal;

Constant-current circuit, for according to described control signal for series connection after LED branch road constant current is provided.

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 LED lamp red, G string is that LED lamp green, that B goes here and there is for yellow.

R string LED lamp is in parallel with the first control switch Sr1; G string LED lamp is in parallel with the second control switch Sr2; R string LED lamp is in parallel with the 3rd control switch Sr3;

Constant-current circuit can be the circuit of non-isolation type, as Buck, and Boost, or the circuit such as Buck-Boost; Also can be the circuit of isolated form, as 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, export control signal to control switch Sr1, Sr2, Sr3 and constant-current circuit according to predefined characteristic parameter coding rule.

Detection and change-over circuit can, by controlling constant-current circuit, be controlled the current amplitude of its output, regulate the total brightness of LED module; Can be by controlling the closed and disconnected of control switch Sr1, Sr2, Sr3, indirectly control the duty ratio between the electric current of R string LED lamp, G string LED lamp, B string LED lamp.

Detection and change-over circuit regulate the total brightness of LED module by controlling the mean value of LED module total current.

Detection and change-over circuit are by controlling respectively the closed and disconnected of control switch Sr1, Sr2, Sr3, control respectively the duty ratio between the electric current of R string LED lamp, G string LED lamp, B string LED lamp, thereby the current average of controlling the lamp of every kind of color regulates the integral color of LED module.

It should be noted that, the present embodiment is gone here and there LED lamp, i.e. three LED branch roads to comprise R, G and B tri-in a LED module; Can also be: two or more LED branch roads, in same LED module, different LED branch roads can be the lamp of same color, can be also the lamp of different colours; The color of the LED branch road in different LED module can be identical or different.

Referring to Figure 10, the another example structure figure that this figure is LED module provided by the invention.

Shown in Figure 10 is the cut-away view of the first LED module, because the structure of each LED module is identical, therefore, is only introduced as an example of the first LED module example.

The constant-current circuit that Figure 10 provides adopts the Buck circuit of non-isolation type to realize.

Referring to Figure 11, another example structure figure that this figure is 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 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 circuit parallel connections are at the two ends of DC bus-bar voltage;

Detect and change-over circuit, for detection of the regulating command of carrying in DC bus-bar voltage, described regulating command is converted to corresponding control signal and sends to respectively each current-limiting control circuit;

Current-limiting control circuit, for the electric current of this LED branch road of sampling, according to described control signal control current-limiting circuit, regulates the electric current of this LED branch road.

As shown in figure 11, take three LED branch roads as example is introduced, 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 only introduced as an example of R branch road example below.

Current-limiting control circuit 202b gathers the electric current of R branch road, specifically can realize by sampling resistor Rs1, receive the control signal Iset1 of detection and change-over circuit 202a simultaneously, by the electric current and the Iset1 comparison that gather, the resistance sizes of output control signal control adjustment pipe S1, thereby the electric current of control R branch road.

As shown in figure 11, current-limiting circuit 202c comprises adjustment pipe S1 and sampling resistor Rs1,

Described adjustment pipe S1, sampling resistor Rs1 and LED series connection;

Described adjustment pipe S1 is connected an input of described current-limiting control circuit 202b with the common port of sampling resistor Rs1;

The output of current-limiting control circuit 202b connects the control end of adjusting pipe S1.

It should be noted that, each LED module can also comprise a LED branch road, after connecting, is connected to voltage changer output after described N LED branch circuit parallel connection with this LED branch road.

As shown in figure 11, after R branch road, G branch road and the B branch circuit parallel connection in first LED module 202, connect with W 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, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction.Although the present invention discloses as above with preferred embodiment, but not in order to limit the present invention.Any those of ordinary skill in the art, do not departing from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible variations and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not depart from technical solution of the present invention,, all still belongs in the scope of technical solution of the present invention protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present invention.

Claims (8)

1. a LED light adjusting system, is characterized in that, comprising: centralized driving module, at least one LED module, and each LED module comprises at least one paths of LEDs branch road;
The input of described centralized driving module connects power supply, and described centralized driving module is for receiving the control signal that characterizes regulating command, and output DC bus-bar voltage is given described each LED module, and described DC bus-bar voltage is carried described regulating command;
Described each LED module, the described regulating command of carrying for detection of described DC bus-bar voltage, regulates the electric current of the LED branch road in this LED module according to described regulating command;
Wherein, described centralized driving module comprises: voltage changer and output voltage controlling circuit;
Described output voltage controlling circuit, for detection of the control signal of described DC bus-bar voltage and the described characterization control instruction of reception, generates and regulates control signal to export to voltage changer;
The input of described voltage changer connects power supply, for giving each LED module according to adjusting control signal output DC bus-bar voltage;
Described output voltage controlling circuit comprises integrated transporting discharging, the first divider resistance, the second divider resistance, the 3rd resistance and compensating network;
The negative input end of described integrated transporting discharging connects the output plus terminal of voltage changer by the first divider resistance, connect the output negative terminal of voltage changer by the second divider resistance;
The negative input end of described integrated transporting discharging connects the control signal of described characterization control instruction by the 3rd resistance;
The positive input terminal of described integrated transporting discharging connects reference voltage;
The output of described integrated transporting discharging connects described voltage changer as the output of this output voltage controlling circuit;
Between the negative input end of described integrated transporting discharging and output, be connected with described compensating network.
2. LED light adjusting system according to claim 1, is characterized in that, the amplitude that described regulating command is DC bus-bar voltage or AC ripple voltage;
In the time of amplitude that described regulating command is DC bus-bar voltage, the different amplitude sizes of described DC bus-bar voltage represent different regulating commands;
In the time that described regulating command is AC ripple voltage, at least one characteristic parameter of described AC ripple voltage represents regulating command.
3. LED light adjusting system according to claim 1, is characterized in that, described each LED module comprises detection and change-over circuit and N LED branch road; N is 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;
Described detection and change-over circuit, for detection of the regulating command of carrying in DC bus-bar voltage, be converted to corresponding control signal by described regulating command and send to respectively each constant-current circuit;
Described constant-current circuit, for providing constant electric current according to described control signal for corresponding LED branch road.
4. light adjusting system according to claim 3, is characterized in that, described constant-current circuit is Buck circuit, Boost circuit, Buck-Boost circuit, Flyback circuit, Forword circuit, bridge circuit, push-pull circuit or LLC resonant circuit.
5. 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 positive integer;
Each LED branch road two ends control switch in parallel;
The color of the LED lamp in each LED branch road is identical;
N in each LED module LED branch road is cascaded, the positive output end of the anodic bonding constant-current circuit of the LED branch road after series connection, and negative electrode connects negative output terminal;
Detect and change-over circuit, for detection of the regulating command of carrying in DC bus-bar voltage, described regulating command is converted to control signal and sends to constant-current circuit; Or, give each control switch by described regulating command transmit button signal;
Constant-current circuit, for according to described control signal for series connection after LED branch road constant current is provided.
6. 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 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 circuit parallel connections are at the two ends of DC bus-bar voltage;
Detect and change-over circuit, for detection of the regulating command of carrying in DC bus-bar voltage, described regulating command is converted to corresponding control signal and sends to respectively each current-limiting control circuit;
Current-limiting control circuit, for the electric current of this LED branch road of sampling, according to described control signal control current-limiting circuit, regulates the electric current of this LED branch road.
7. light adjusting system according to claim 6, is characterized in that, each described current-limiting circuit comprises adjusts pipe and sampling resistor,
Described adjustment pipe, sampling resistor and LED series connection;
The common port of described adjustment pipe and sampling resistor is connected an input of described current-limiting control circuit;
The output of current-limiting control circuit connects the control end of adjusting pipe.
8. according to the light adjusting system described in claim 6 or 7, it is characterized in that, each LED module also comprises a LED branch road, after connecting, is connected to voltage changer output after described N LED branch circuit parallel connection with this LED branch road.
CN201010607537.6A 2010-12-27 2010-12-27 LED dimming system CN102548101B (en)

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