WO2012088920A1 - 一种led调光系统 - Google Patents

一种led调光系统 Download PDF

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Publication number
WO2012088920A1
WO2012088920A1 PCT/CN2011/079381 CN2011079381W WO2012088920A1 WO 2012088920 A1 WO2012088920 A1 WO 2012088920A1 CN 2011079381 W CN2011079381 W CN 2011079381W WO 2012088920 A1 WO2012088920 A1 WO 2012088920A1
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WO
WIPO (PCT)
Prior art keywords
led
circuit
voltage
control
branch
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PCT/CN2011/079381
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English (en)
French (fr)
Inventor
华桂潮
姜熠
葛良安
柳杨
Original Assignee
英飞特电子（杭州）有限公司
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Publication of WO2012088920A1 publication Critical patent/WO2012088920A1/zh

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Classifications

    • 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

Definitions

  • the present invention relates to the field of dimming technology, and in particular, to an LED dimming system.
  • the dimming system of LED lighting follows the dimming system of incandescent lamps, and the cost of the dimming system of incandescent lamps is low.
  • the figure shows a dimming system for a prior art LED illuminator.
  • the dimming system of the LED illuminator includes an AC power supply 101, an AC chopper dimmer 102, n drivers, and n LED branches.
  • n LED branches are Al, A2, - up to An.
  • the output of the AC power supply 101 is connected to the AC chopper dimmer 102; the AC chopper dimmer 102 is used to uniformly dim the n parallel drives. Each driver corresponds to one LED branch.
  • each LED branch has its own AC/DC driver, which will make the circuit of the entire dimming system more complicated, and the control is more complicated, increasing the cost of the entire circuit.
  • the technical problem to be solved by the present invention is to provide an LED dimming system, which has a simple circuit structure, convenient control, and low cost.
  • An embodiment of the present invention provides an LED dimming system, including: a centralized driving module, at least one LED module, each LED module including at least one LED branch;
  • the input end of the centralized driving module is connected to the power supply, and the centralized driving module receives a control signal indicating the adjustment command for outputting the DC bus voltage to each of the LED modules, and the DC bus voltage carries the adjustment command;
  • Each of the LED modules is configured to detect the adjustment command carried by the DC bus voltage, and adjust a current of an LED branch in the LED module according to the adjustment instruction.
  • the adjustment command is a magnitude of a DC bus voltage or an AC ripple voltage;
  • the adjustment command is the amplitude of the DC bus voltage, different magnitudes of the DC bus voltages represent different adjustment commands;
  • At least one characteristic parameter of the AC ripple voltage represents an adjustment command.
  • the centralized driving module comprises: a voltage converter and an output voltage control circuit; the output voltage control circuit is configured to detect the DC bus voltage and receive the control signal indicating the control command, and generate an adjustment control signal output Power converter
  • the input of the voltage converter is connected to a power source for outputting a DC bus voltage to each LED module according to the adjustment control signal.
  • the output voltage control circuit comprises an integrated operational amplifier, a first voltage dividing resistor, a second voltage dividing resistor, a third resistor, a fourth resistor and a compensation network;
  • the negative input terminal of the integrated operational amplifier is connected to the common end of the first voltage dividing resistor and the second voltage dividing resistor through a fourth resistor, and the other end of the first voltage dividing resistor is connected to the output positive terminal of the voltage converter, and the second voltage dividing resistor The other end is connected to the output negative terminal of the voltage converter;
  • the negative input terminal of the integrated operational amplifier is connected to the control signal representing the control command through a third resistor;
  • the positive input terminal of the integrated operational amplifier is connected to a reference voltage
  • An output end of the integrated operational amplifier is connected to the voltage converter as an output end of the output voltage control circuit
  • the compensation network is connected between the negative input terminal and the output terminal of the integrated operational amplifier.
  • each of the LED modules includes a detection and conversion circuit and N LED branches; N is a positive integer;
  • each LED branch has the same color, and each LED branch corresponds to a constant current circuit
  • the detecting and converting circuit is configured to detect an adjustment command carried in a DC bus voltage, and convert the adjustment command into a corresponding control signal and send the same to each constant current circuit;
  • the constant current circuit is configured to provide a constant current for the corresponding LED branch according to the control signal.
  • the constant current circuit is a Buck circuit, a Boost circuit, a Buck-Boost circuit, and a Flyback Circuit, Forword circuit, bridge circuit, push-pull circuit or LLC resonant circuit.
  • each LED module comprises a detection and conversion circuit, a constant current circuit, N LED branches and N control switches; N is a positive integer;
  • a control switch is connected in parallel at each end of each LED branch
  • the LED lights in each LED branch are the same color
  • N LED branches in each LED module are connected in series, the anode of the LED branch in series is connected to the positive output end of the constant current circuit, and the cathode is connected to the negative output end;
  • a detection and conversion circuit configured to detect an adjustment command carried in the DC bus voltage, convert the adjustment command into a control signal and send the signal to the constant current circuit; or send the adjustment command to send a switch signal to each control switch;
  • each LED module comprises a detection and conversion circuit, N LED branches, N current limiting circuits, and N current limiting control circuits; N is a positive integer;
  • Each LED branch is connected in series with a current limiting circuit, and each current limiting circuit corresponds to a current limiting control circuit;
  • All LED branches are connected in parallel at both ends of the DC bus voltage
  • a detection and conversion circuit configured to detect an adjustment command carried in the DC bus voltage, and convert the adjustment command into a corresponding control signal and respectively send to each current limiting control circuit
  • the current limiting control circuit is configured to sample the current of the LED branch, control the current limiting circuit according to the control signal, and adjust the current of the LED branch.
  • each of the current limiting circuits includes an adjustment tube and a sampling resistor
  • the adjusting tube, the sampling resistor and the LED are connected in series;
  • the common end of the adjusting tube and the sampling resistor is connected to one input end of the current limiting control circuit; the output end of the current limiting control circuit is connected to the control end of the adjusting tube.
  • each of the LED modules further includes an LED branch, and the N LED branches are connected in parallel to the LED branch and connected to the output of the voltage converter.
  • the present invention has the following advantages:
  • the LED dimming system provided by the present invention comprises: a centralized driving module, at least one LED module, each LED module includes at least one LED branch; the input end of the centralized driving module is connected to the power source, and the set The middle driving module receives a control signal representing the adjustment command for outputting a DC bus voltage to each LED module, and the DC bus voltage carries the adjustment command; each LED module is configured to detect an adjustment command carried by the DC bus voltage, according to the adjustment The command regulates the current of the LED branch in the LED module.
  • the LED dimming system provided by the invention uses only one centralized driving module, has a simple structure and convenient control, and therefore, the cost of the whole system is low.
  • 1 is a dimming system of a prior art LED lighting lamp
  • Embodiment 1 of an LED centralized dimming system provided by the present invention
  • FIG. 3 is a structural diagram of an embodiment of a centralized driving module provided by the present invention.
  • FIG. 4 is a structural diagram of another embodiment of a centralized driving module provided by the present invention.
  • FIG. 5 is a schematic diagram of Embodiment 1 of an adjustment instruction provided by the present invention.
  • FIG. 6 is a schematic diagram of still another embodiment of the adjustment instruction provided by the present invention.
  • FIG. 7 is a structural diagram of another embodiment of an LED dimming system provided by the present invention.
  • FIG. 8 is a structural diagram of an embodiment of an LED module provided by the present invention.
  • FIG. 9 is a structural diagram of still another embodiment of an LED dimming system provided by the present invention.
  • FIG. 10 is a structural diagram of still another embodiment of an LED module provided by the present invention.
  • Fig. 11 is a structural view showing another embodiment of the LED module provided by the present invention.
  • the LED dimming system provided by the embodiment of the present invention includes: a centralized driving module 201, at least one LED module, and each LED module includes at least one LED branch;
  • the input end of the centralized driving module 201 is connected to the power source Vin, and the centralized driving module 201 receives a control signal indicating the adjustment command for outputting the DC bus voltage VI to supply power to each of the LED modules, and the DC bus voltage VI carries the adjustment command. ;
  • Vin can be an AC voltage or a DC voltage; when Vin is an AC At the time of voltage, the centralized drive module 201 also has a rectifying function.
  • Each of the LED modules is configured to detect the adjustment command carried by the DC bus voltage VI, and adjust a current of the LED branch in the LED module according to the adjustment instruction.
  • the LED dimming system provided by the present invention comprises: a centralized driving module, at least one LED module, each LED module includes at least one LED branch; the input end of the centralized driving module is connected to the power source, and the centralized driving module receives a control signal indicating the adjustment instruction.
  • the DC bus voltage For outputting the DC bus voltage to each LED module, the DC bus voltage carries the adjustment command; each LED module is used for detecting an adjustment command carried by the DC bus voltage, and adjusting the LED branch in the LED module according to the adjustment command Current.
  • the LED dimming system provided by the invention uses only one centralized driving module, has a simple structure and is convenient to control, and therefore, the cost of the whole system is low.
  • FIG. 3 is a structural diagram of an embodiment of a centralized driving module provided by the present invention.
  • the centralized driving module provided in this embodiment includes: a voltage converter 201a and an output voltage control circuit 201b;
  • the output voltage control circuit 201b is configured to detect the DC bus voltage VI and receive the control signal V2 indicating the adjustment command, and generate an adjustment control signal output to the voltage converter 201a;
  • the input of the voltage converter 201a is connected to a power source Vin for outputting a DC bus voltage VI to each of the LED modules in accordance with an adjustment control signal.
  • the output voltage control circuit 201b detects the DC bus voltage VI, controls the DC bus voltage VI output by the centralized driving module to be stable at a certain value, and receives the control signal V2 on the other hand, and controls the DC bus voltage VI output by the centralized driving module. It changes as the control signal V2 changes.
  • the control signal V2 characterizing the adjustment command may be a signal generated from a dimming knob device or a remote controller, or a standard interface signal of a dimming system such as DALI or DMX.
  • FIG. 4 the figure is a structural diagram of another embodiment of the centralized driving module provided by the present invention.
  • the output voltage control circuit 201b includes an integrated operational amplifier IC, a first voltage dividing resistor R1, a second voltage dividing resistor R2, a third resistor R3, a fourth resistor R4, and a compensation network;
  • the negative input terminal of the comparator IC is connected to the common terminal of the first voltage dividing resistor R1 and the second voltage dividing resistor R2 through the fourth resistor R4, and the other end of the first voltage dividing resistor R1 is connected to the output positive terminal of the voltage converter 201a.
  • the other end of the second voltage dividing resistor R2 is connected to the output negative terminal of the voltage converter 201a;
  • the negative input terminal of the integrated operational amplifier IC is connected to the control signal V2 indicating the control command through the third resistor R3;
  • the positive input terminal of the integrated operational amplifier IC is connected to a reference voltage Vref;
  • the output of the integrated operational amplifier IC is connected to the output of the output voltage control circuit 201b as the voltage converter 201a;
  • the compensation network is connected between the negative input terminal and the output terminal of the integrated operational amplifier IC.
  • the first voltage dividing resistor R1 and the second voltage dividing resistor R2 detect the DC bus voltage VI, and are input to the negative input terminal of the integrated operational amplifier IC through the fourth resistor R4, and the control signal V2 is input to the integrated through the third resistor R3.
  • the negative input of the op amp IC therefore, the signal at the negative input of the integrated op amp IC is the superposition of the sampled signal of the DC bus voltage VI and the control signal V2.
  • the adjustment command may be a magnitude of a DC bus voltage or an AC ripple voltage
  • At least one characteristic parameter of the AC ripple voltage represents an adjustment command.
  • the characteristic parameter of the AC ripple voltage may be at least one of an amplitude, a peak-to-peak value, a frequency, a duty ratio, a high voltage time, a low voltage time, and the like of the AC ripple voltage.
  • the adjustment instructions can be encoded according to predetermined coding rules, with different codes representing different adjustment instructions.
  • the AC ripple voltage may be a pulse signal, a sinusoidal signal, a triangular wave signal, or a trapezoidal signal.
  • the implementation of the characteristic parameters of the adjustment command for the amplitude of the DC bus voltage or the AC ripple voltage, respectively, will be specifically described below with reference to FIGS. 5 and 6.
  • FIG. 5 the figure is a schematic diagram of Embodiment 1 of an adjustment instruction provided by the present invention.
  • Figure 5 shows the detection of the adjustment command by the magnitude of the DC link voltage.
  • the specific implementation manner may be: changing the amplitude of the DC bus voltage VI by changing the amplitude of the control signal V2 representing the adjustment command, thereby transmitting an adjustment command to the LED module.
  • the adjustment command may include a dimming command and a color adjustment command, or may include only one of them.
  • dimming refers to adjusting the brightness
  • coloring refers to adjusting the color or adjusting the color temperature.
  • the amplitude of the DC bus voltage VI can pass the adjustment command to adjust the brightness, and To pass the adjustment command to adjust the color or adjust the color temperature.
  • the amplitude variation range of the DC bus voltage VI can be divided into different subintervals, and different subintervals represent different adjustment commands.
  • the amplitude range of the VI is (300V, 400V), which is divided into two sections: the first subinterval (300V, 350V) and the second subinterval (350V, 400V).
  • the first subinterval (300V, 350V) is the interval for adjusting the color
  • the second subinterval (350V, 400V) is the interval for adjusting the brightness
  • the first subinterval (300V, 350V) is the interval for adjusting the brightness
  • the subinterval (350V, 400V) is the interval for adjusting the color.
  • interval representing the adjustment of the brightness it is possible to continue to divide a plurality of intervals, each of which represents a brightness level; in the interval representing the adjusted color, it is possible to continue to divide a plurality of intervals, each of which represents a color.
  • the magnitude of the DC bus voltage VI is used to pass only a single dimming command or color grading command, similar to the example illustrated in FIG.
  • FIG. 6 is a schematic diagram of still another embodiment of an adjustment instruction provided by the present invention.
  • the adjustment command is transmitted by the characteristic parameter of the alternating ripple voltage.
  • the characteristic parameter of the AC ripple voltage is used to transmit both the adjustment command for adjusting the brightness and the adjustment command for adjusting the color as an example.
  • two characteristic parameters of the superimposed AC ripple voltage on the DC bus voltage VI are respectively transmitted to adjust the color and adjust the brightness, for example, to set the frequency of the AC ripple voltage to adjust the color; the duty cycle transmission adjustment of the AC ripple voltage brightness.
  • Each frequency point or frequency segment of the AC ripple voltage corresponds to a lamp of one color.
  • the current value of each LED branch corresponding to each color is set in advance in the LED module. After detecting the frequency of the AC ripple voltage superimposed on the DC bus voltage, the LED module searches for the current of each LED branch corresponding to the frequency. The value provides a corresponding current value for each LED branch.
  • the different duty cycles of the AC ripple voltage correspond to the different brightness of the LED lamp.
  • the LED module sets a current value corresponding to different brightness of the LED lamp, and after detecting the duty ratio of the AC ripple voltage superimposed by the DC bus voltage, the LED module searches for the current value of each LED branch corresponding to the duty ratio, thereby Corresponding current values are provided for each LED branch.
  • any one of the characteristic parameters of the AC ripple voltage is used only to convey a single toning or dimming adjustment command in a similar manner to the example illustrated in FIG.
  • Each LED module provided in this embodiment includes a detection and conversion circuit and N LED branches; N is a positive integer;
  • Each LED module consists of three LED branches.
  • each LED branch has the same color, and each LED branch corresponds to a constant current circuit; as shown in FIG. 7, the first LED module 202 includes three LED branches, respectively, using Al, A2, and A3 said.
  • the nth LED module 203 includes three LED branches, denoted by A4, A5 and A6, respectively.
  • the detecting and converting circuit is configured to detect an adjustment command carried in the DC bus voltage, and convert the adjustment command into a corresponding control signal and send the signal to each constant current circuit.
  • the input terminal of the first detecting and converting circuit 202a is connected to the DC bus voltage VI, and the output terminals are respectively connected to the control terminals of the respective constant current circuits.
  • the input end of the nth detecting and converting circuit 203a is connected to the DC bus voltage VI, and the output ends are respectively connected to the control terminals of the respective constant current circuits.
  • the constant current circuit is configured to provide a stable current for the corresponding LED branch according to the control signal.
  • the constant current circuit may be a Buck circuit, a Boost circuit, a Buck-Boost circuit, a Flyback circuit, a Forword circuit, a bridge circuit, a push-pull circuit, or an LLC resonant circuit.
  • each LED branch in each LED module corresponds to a constant current circuit. It should be noted that each LED module can include at least one LED branch, two or more
  • the LED branches can be the same color or different colors; the LED branches in different LED modules can have the same or different colors.
  • FIG 8 is a structural diagram of an embodiment of an LED module provided by the present invention.
  • Fig. 8 Only the internal structure of one LED module is shown in Fig. 8, which is a specific embodiment corresponding to Fig. 7. Since the internal structure of each LED module in Fig. 7 is the same, the LED module in Fig. 8 is the first LED module in Fig. 7 as an example.
  • the constant current circuit in this embodiment may be specifically implemented by a DC/DC circuit, and is specifically implemented by a Buck circuit.
  • the output of the detection and conversion circuit 202a is connected to a control circuit in each DC/DC circuit, and the output of the control circuit is connected to the switch S2, and the output current of the Buck circuit is set to a value by controlling the closing and opening of S2. .
  • the detection and conversion circuit 202a detects the amplitude of the DC bus voltage and converts it into a control signal for controlling the DC/DC circuit, thereby realizing control of each LED branch current. , thereby controlling the overall color and brightness of the LED module.
  • the detection and conversion circuit 202a detects the characteristic parameter of the AC ripple voltage and converts it into a control signal for controlling the DC/DC circuit to realize each LED branch.
  • the current is controlled to control the overall color and brightness of the LED module.
  • FIG. 9 is a structural diagram of still another embodiment of the LED dimming system provided by the present invention.
  • Each LED module provided in this embodiment includes a detection and conversion circuit, a constant current circuit, N LED branches, and N control switches; N is a positive integer;
  • a control switch is connected in parallel at each end of each LED branch
  • N LED branches in each LED module are connected in series, the anode of the LED branch in series is connected to the positive output end of the constant current circuit, and the cathode is connected to the negative output end;
  • a detection and conversion circuit configured to detect an adjustment command carried in the DC bus voltage, convert the adjustment command into a control signal and send the signal to the constant current circuit; or send the adjustment command to the switch signal Various control switches;
  • the first LED module 202 shown in Fig. 9 includes three LED branches, R, G and B, respectively, and the LED lights in each LED branch have the same color.
  • the LEDs of the R string are red
  • the LEDs of the G string are green
  • the LEDs of the B string are yellow.
  • the R string LED lamp is connected in parallel with the first control switch Sri; the G string LED lamp is connected in parallel with the second control switch Sr2; the R string LED lamp is connected in parallel with the third control switch Sr3;
  • the constant current circuit can be a non-isolated circuit such as a Buck, Boost, or Buck-Boost circuit; or an isolated circuit such as a Flyback, Forword, a bridge circuit, a push-pull circuit, or a LLC-type resonant circuit.
  • a non-isolated circuit such as a Buck, Boost, or Buck-Boost circuit
  • an isolated circuit such as a Flyback, Forword, a bridge circuit, a push-pull circuit, or a LLC-type resonant circuit.
  • the detection and conversion circuit detects the characteristic parameters of the adjustment command carried by the DC bus voltage, and outputs control signals to the control switches Sri, Sr2, Sr3 and the constant current circuit according to a preset characteristic parameter coding rule.
  • the detection and conversion circuit can control the constant current circuit to control the amplitude of the current output, that is, adjust the total brightness of the LED module; the R-string LED lamp can be indirectly controlled by controlling the closing and opening of the control switches Srl, Sr2, Sr3, The duty ratio between the current of the G string LED lamp and the B string LED lamp.
  • the detection and conversion circuit adjusts the total brightness of the LED module by controlling the average of the total current of the LED module.
  • the detection and conversion circuit controls the duty ratio between the currents of the R string LED lamp, the G string LED lamp, and the B string LED lamp by controlling the closing and opening of the control switches Sri, Sr2, and Sr3, respectively, thereby controlling each color.
  • the current average of the lamp is used to adjust the overall color of the LED module.
  • an LED module includes three LED lights of R, G, and B, that is, three LED branches; or: two or more LED branches, in the same LED module.
  • Different LED branches may be lamps of the same color or lamps of different colors; the colors of the LED branches in different LED modules may be the same or different.
  • FIG. 10 there is shown a block diagram of still another embodiment of an LED module provided by the present invention.
  • Figure 10 shows the internal structure of the first LED module. Since the structure of each LED module is the same, only the first LED module is taken as an example.
  • FIG. 11 is a structural diagram of another embodiment of an LED module provided by the present invention.
  • Each LED module includes a detection and conversion circuit, N LED branches, N current limiting circuits, and N current limiting control circuits; N is a positive integer;
  • Each LED branch is connected in series with a current limiting circuit, and each current limiting circuit corresponds to a current limiting control circuit;
  • All LED branches are connected in parallel at both ends of the DC bus voltage
  • a detection and conversion circuit configured to detect an adjustment command carried in the DC bus voltage, and convert the adjustment command into a corresponding control signal and respectively send to each current limiting control circuit
  • the current limiting control circuit is configured to sample the current of the LED branch, control the current limiting circuit according to the control signal, and adjust the current of the LED branch.
  • each LED branch corresponds to a color.
  • each LED branch is similar.
  • the following is an example of the R branch.
  • the current limiting control circuit 202b collects the current of the R branch, which can be realized by the sampling resistor Rsl, and simultaneously receives the control signal Isetl of the detecting and converting circuit 202a, compares the collected current with Isetl, and outputs the control signal to control the resistance of the adjusting tube S1. , thereby controlling the current of the R branch.
  • the current limiting circuit 202c includes an adjustment tube S1 and a sampling resistor Rsl.
  • the adjusting tube S1, the sampling resistor Rsl and the LED are connected in series;
  • the common end of the adjusting tube S1 and the sampling resistor Rs1 is connected to an input end of the current limiting control circuit 202b;
  • the output of the current limiting control circuit 202b is connected to the control terminal of the regulating tube S1.
  • each LED module may further include an LED branch, and the N LED branches are connected in parallel to the LED branch and connected to the output of the voltage converter.
  • the R branch, the G branch and the B branch in the first LED module 202 are connected in parallel and connected in series with the W branch.
  • the LED dimming system provided by the above embodiments of the present invention uses a centralized dimming module to realize a higher power factor of the entire system on the grid side, thereby reducing electromagnetic interference.

Description

一种 LED调光系统
本申请要求于 2010 年 12 月 27 日提交中国专利局、 申请号为 201010607537.6、 发明名称为"一种 LED调光系统，，的中国专利申请的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及调光技术领域， 特别涉及一种 LED调光系统。
背景技术
目前 LED照明灯的调光系统沿用了白炽灯的调光系统， 由于白炽灯的调 光系统成本较低。 参见图 1 , 该图为现有技术中 LED照明灯的调光系统。
该 LED照明灯的调光系统包括交流供电电源 101、 交流斩波调光器 102、 n个驱动器和 n个 LED支路。 其中， n个 LED支路分别为 Al、 A2, —直到 An。
交流供电电源 101的输出端连接交流斩波调光器 102;交流斩波调光器 102 用于统一对 n个并联的驱动器进行调光。 每个驱动器对应一路 LED支路。
如果将驱动器设置在 LED灯光源内部，可以将 LED灯直接接入到现有的 白炽灯照明系统中， 不需要改变现有的布线方式。 但是这样将存在以下缺点： 每个 LED支路均自带一个 AC/DC驱动器，这样将造成整个调光系统的电 路较复杂， 控制也比较复杂， 增加整个电路的成本。
发明内容
本发明要解决的技术问题是提供一种 LED调光系统， 电路结构简单， 控 制方便， 成本低。
本发明实施例提供一种 LED调光系统， 包括： 集中驱动模块、 至少一个 LED模块， 每个 LED模块包括至少一路 LED支路；
集中驱动模块的输入端连接电源，集中驱动模块接收表征调节指令的控制 信号， 用于输出直流母线电压给所述每个 LED模块， 所述直流母线电压携带 所述调节指令；
所述每个 LED模块， 用于检测所述直流母线电压携带的所述调节指令， 根据所述调节指令调节该 LED模块中的 LED支路的电流。
优选地， 所述调节指令为直流母线电压的幅值或交流纹波电压； 当所述调节指令为直流母线电压的幅值时，所述直流母线电压的不同幅值 大小代表不同的调节指令；
当所述调节指令为交流纹波电压时，所述交流纹波电压的至少一种特征参 数代表调节指令。
优选地， 所述集中驱动模块包括： 电压变换器和输出电压控制电路； 所述输出电压控制电路，用于检测所述直流母线电压和接收所述表征控制 指令的控制信号， 生成调节控制信号输出给电压变换器；
所述电压变换器的输入端连接电源，用于根据调节控制信号输出直流母线 电压给每个 LED模块。
优选地， 所述输出电压控制电路包括集成运放、 第一分压电阻、 第二分压 电阻、 第三电阻、 第四电阻和补偿网络；
所述集成运放的负输入端通过第四电阻连接第一分压电阻和第二分压电 阻的公共端， 第一分压电阻另一端连接电压变换器的输出正端， 第二分压电阻 另一端连接电压变换器的输出负端；
所述集成运放的负输入端通过第三电阻连接所述表征控制指令的控制信 号；
所述集成运放的正输入端连接基准电压；
所述集成运放的输出端作为该输出电压控制电路的输出端连接所述电压 变换器；
所述集成运放的负输入端和输出端之间连接有所述补偿网络。
优选地，所述每个 LED模块包括检测及转换电路和 N个 LED支路； N为 正整数；
每个 LED支路中的 LED灯的颜色相同 , 每个 LED支路对应一个恒流电 路；
所述检测及转换电路， 用于检测直流母线电压中携带的调节指令，将所述 调节指令转换为相应的控制信号分别发送给各个恒流电路；
所述恒流电路， 用于根据所述控制信号为对应的 LED支路提供恒定的电 流。
优选地，所述恒流电路为 Buck电路、 Boost电路、 Buck- Boost电路、 Flyback 电路、 Forword电路、 桥式电路、 推挽电路或 LLC谐振电路。
优选地， 每个 LED模块包括检测及转换电路、 恒流电路、 N个 LED支路 和 N个控制开关； N为正整数；
每个 LED支路两端并联一个控制开关；
每个 LED支路中的 LED灯的颜色相同；
每个 LED模块中的 N个 LED支路串联在一起， 串联后的 LED支路的阳 极连接恒流电路的正输出端， 阴极接负输出端；
检测及转换电路， 用于检测直流母线电压中携带的调节指令，将所述调节 指令转换为控制信号发送给恒流电路； 或者，将所述调节指令发送开关信号给 各个控制开关；
恒流电路， 用于根据所述控制信号为串联后的 LED支路提供恒定电流。 优选地， 每个 LED模块包括检测及转换电路、 N个 LED支路、 N个限流 电路、 N个限流控制电路； N为正整数；
每个 LED支路与一个限流电路串联， 每个限流电路对应一个限流控制电 路；
所有 LED支路并联在直流母线电压的两端；
检测及转换电路， 用于检测直流母线电压中携带的调节指令，将所述调节 指令转换为相应的控制信号分别发送给各个限流控制电路；
限流控制电路， 用于采样本 LED支路的电流， 根据所述控制信号控制限 流电路， 调节本 LED支路的电流。
优选地， 每个所述限流电路包括调整管和采样电阻，
所述调整管、 采样电阻和 LED串联；
所述调整管和采样电阻的公共端连接所述限流控制电路的一个输入端； 限流控制电路的输出端连接调整管的控制端。
优选地， 每个 LED模块还包括一个 LED支路， 所述 N个 LED支路并联 后与该一个 LED支路串联后连接在电压变换器输出端。
与现有技术相比， 本发明具有以下优点：
本发明提供的 LED调光系统包括： 集中驱动模块、 至少一个 LED模块， 每个 LED模块包括至少一路 LED支路； 集中驱动模块的输入端连接电源， 集 中驱动模块接收表征调节指令的控制信号，用于输出直流母线电压给每个 LED 模块， 直流母线电压携带所述调节指令； 每个 LED模块， 用于检测直流母线 电压携带的调节指令， 根据调节指令调节该 LED模块中的 LED支路的电流。 本发明提供的 LED调光系统， 仅使用一个集中驱动模块， 结构简单， 控制方 便， 因此， 整个系统的成本较低。
附图说明
图 1是现有技术中 LED照明灯的调光系统；
图 2是本发明提供的 LED集中调光系统实施例一结构图；
图 3是本发明提供的集中驱动模块的实施例结构图；
图 4是本发明提供的集中驱动模块的另一实施例结构图；
图 5是本发明提供的调节指令实施例一示意图；
图 6是本发明提供的调节指令又一实施例示意图；
图 7是本发明提供的 LED调光系统的另一实施例结构图；
图 8是本发明提供的 LED模块的实施例结构图；
图 9是本发明提供的 LED调光系统的又一实施例结构图；
图 10是本发明提供的 LED模块的又一实施例结构图；
图 11是本发明提供的 LED模块的另一实施例结构图。
具体实施方式
为使本发明的上述目的、 特征和优点能够更加明显易懂， 下面结合附图对 本发明的具体实施方式做详细的说明。
参见图 2, 该图为本发明提供的 LED集中调光系统实施例一结构图。 本发明实施例提供的 LED调光系统， 包括： 集中驱动模块 201、 至少一 个 LED模块， 每个 LED模块包括至少一路 LED支路；
如图 2所示， 所有的 LED模块并联， 图 2中仅示出了第一个 LED模块 202和第 n个 LED模块 203。
集中驱动模块 201的输入端连接电源 Vin, 集中驱动模块 201接收表征调 节指令的控制信号， 用于输出直流母线电压 VI给所述每个 LED模块供电， 所述直流母线电压 VI携带所述调节指令；
需要说明的是， Vin可以为交流电压， 也可以为直流电压； 当 Vin为交流 电压时， 集中驱动模块 201还具有整流的功能。
所述每个 LED模块， 用于检测所述直流母线电压 VI携带的所述调节指 令， 根据所述调节指令调节该 LED模块中的 LED支路的电流。
本发明提供的 LED调光系统包括： 集中驱动模块、 至少一个 LED模块， 每个 LED模块包括至少一路 LED支路； 集中驱动模块的输入端连接电源， 集 中驱动模块接收表征调节指令的控制信号，用于输出直流母线电压给每个 LED 模块， 直流母线电压携带所述调节指令； 每个 LED模块， 用于检测直流母线 电压携带的调节指令， 根据调节指令调节该 LED模块中的 LED支路的电流。 本发明提供的 LED调光系统， 仅使用一个集中驱动模块， 结构简单， 控制方 便， 因此， 整个系统的成本较低。
参见图 3 , 该图为本发明提供的集中驱动模块的实施例结构图。
本实施例提供的集中驱动模块包括： 电压变换器 201a和输出电压控制电 路 201b;
所述输出电压控制电路 201b,用于检测所述直流母线电压 VI和接收所述 表征调节指令的控制信号 V2, 生成调节控制信号输出给电压变换器 201a;
所述电压变换器 201a的输入端连接电源 Vin, 用于根据调节控制信号输 出直流母线电压 VI给每个 LED模块。
其中， 输出电压控制电路 201b, —方面检测直流母线电压 VI , 控制集中 驱动模块输出的直流母线电压 VI稳定在某一值， 另一方面接收控制信号 V2, 控制集中驱动模块输出的直流母线电压 VI随着控制信号 V2的变化而变化。
所述表征调节指令的控制信号 V2可以为来自调光旋钮装置或遥控器产生 的信号， 或者 DALI、 DMX等调光系统的标准接口信号。
下面结合图 4介绍输出电压控制电路 201b的具体实现方式， 参见图 4, 该图为本发明提供的集中驱动模块的另一实施例结构图。
所述输出电压控制电路 201b包括集成运放 IC、 第一分压电阻 Rl、 第二 分压电阻 R2、 第三电阻 R3、 第四电阻 R4和补偿网络；
所述比较器 IC的负输入端通过第四电阻 R4连接第一分压电阻 R1和第二 分压电阻 R2的公共端， 第一分压电阻 R1的另一端连接电压变换器 201a的输 出正端， 第二分压电阻 R2的另一端连接电压变换器 201a的输出负端； 所述集成运放 IC的负输入端通过第三电阻 R3连接所述表征控制指令的 控制信号 V2;
所述集成运放 IC的正输入端连接基准电压 Vref;
所述集成运放 IC的输出端作为该输出电压控制电路 201b的输出端连接所 述电压变换器 201a;
所述集成运放 IC的负输入端和输出端之间连接有所述补偿网络。
其中， 第一分压电阻 R1和第二分压电阻 R2检测直流母线电压 VI , 并通 过第四电阻 R4输出入到集成运放 IC的负输入端，控制信号 V2通过第三电阻 R3输入到集成运放 IC的负输入端， 因此， 集成运放 IC的负输入端的信号为 直流母线电压 VI的采样信号和控制信号 V2的叠加。
所述调节指令可以为直流母线电压的幅值或交流纹波电压；
当所述调节指令为直流母线电压的幅值时，所述直流母线电压的不同幅值 大小代表不同的调节指令；
当所述调节指令为交流纹波电压时，所述交流纹波电压的至少一种特征参 数代表调节指令。
交流纹波电压的特征参数可以为交流纹波电压的幅值、 峰峰值、 频率、 占 空比、 高电压时间、 低电压时间等的至少一种。
可以将调节指令按照预定的编码规则进行编码，不同的编码代表不同的调 节指令。
所述交流纹波电压可以为脉冲信号、正弦信号、三角波信号或梯形信号等。 下面结合图 5和图 6具体说明调节指令分别为直流母线电压的幅值或交流 纹波电压的特征参数的实现方式。
参见图 5, 该图为本发明提供的调节指令实施例一示意图。
图 5所示的是通过直流母线电压的幅值来检测调节指令。
具体实现方式可以为： 通过改变表征调节指令的控制信号 V2的幅值， 来 改变直流母线电压 VI的幅值， 从而向 LED模块传递调节指令。
需要说明的是， 调节指令可以包括调光指令和调色指令， 也可以只包括其 中的一种。 其中调光指的是调节亮度， 调色指的是调节颜色或调节色温。
现在假设直流母线电压 VI的幅值既可以传递调节亮度的调节指令， 又可 以传递调节颜色或调节色温的调节指令。
直流母线电压 VI的幅值变化范围可划分为不同的子区间， 不同的子区间 代表不同的调节指令。
例如， 可以将 VI变化的范围， 划分为两个子区间， 每个子区间代表一个 调节指令的类型。
如图 5所示， VI的幅值变化范围是（300V, 400V ) , 将其划分为第一子 区间 （300V, 350V )和第二子区间 （ 350V, 400V ) 两个区间。 设定第一子区 间 （300V, 350V )为调节颜色的区间； 第二子区间 （ 350V, 400V )为调节亮 度的区间； 或者第一子区间 （300V, 350V ) 为调节亮度的区间； 第二子区间 ( 350V, 400V ) 为调节颜色的区间。
可以理解的是， VI 幅值变化范围设定的子区间数目和各个子区间长度可 以根据实际需要设定， 本实施例中不具体限制。
在代表调节亮度的区间内， 可以继续划分多个区间， 每个区间代表一个亮 度等级； 在代表调节颜色的区间内， 可以继续划分多个区间， 每个区间代表一 种颜色。
如果用于单一的调光或调色系统， 则直流母线电压 VI的幅值只用来传递 单一的调光指令或调色指令， 其方法与图 5所述的举例类似。
下面结合图 6说明在直流母线电压上叠加交流纹波电压来传递调节指令 的实现方式。
参见图 6, 该图为本发明提供的调节指令又一实施例示意图。
本实施例中通过交流纹波电压的特征参数来传递调节指令。
下面以交流纹波电压的特征参数既传递调节亮度的调节指令，又传递调节 颜色的调节指令为例进行介绍。
例如， 直流母线电压 VI上的叠加的交流纹波电压的两个特征参数分别传 递调节颜色和调节亮度， 例如设定交流纹波电压的频率传递调节颜色； 交流纹 波电压的占空比传递调节亮度。
交流纹波电压的每个频率点或频率段对应一种颜色的灯。 预先在 LED模 块中设定每种颜色对应的各 LED支路的电流值。 LED模块检测到直流母线电 压上叠加的交流纹波电压的频率之后， 查找该频率对应的各 LED支路的电流 值， 从而为各 LED支路提供对应的电流值。
另外一种， 交流纹波电压的不同占空比对应 LED灯的不同亮度。 预先在
LED模块中设定 LED灯的不同亮度对应的电流值， LED模块检测到直流母线 电压叠加的交流纹波电压的占空比之后， 查找该占空比对应的各 LED支路的 电流值， 从而为各 LED支路提供对应的电流值。
如图 6所示， 仅示出了 V2和 VI的波形图， 其中 V2是脉冲波， VI是叠 加了交流纹波信号的直流母线电压。从图 6中可以看出， 第一调节指令对应的 占空比比第二调节指令的占空比大。
如果用于单一的调光或调色系统， 交流纹波电压的任何一个特征参数只用 来传递单一的调色或调光的调节指令， 其方法与图 6所述的举例类似。
下面结合附图详细介绍本发明提供的 LED调光系统中的 LED模块。
参见图 7 , 该图为本发明提供的 LED调光系统的另一实施例结构图。 本实施例提供的每个 LED模块包括检测及转换电路和 N个 LED支路； N 为正整数；
如图 Ί所示， 仅示出了其中的两个 LED模块， 分别是第一个 LED模块
202、 第 n个 LED模块 203。 每个 LED模块包括三个 LED支路。
每个 LED支路中的 LED灯的颜色相同 , 每个 LED支路对应一个恒流电 路； 如图 7所示， 第一个 LED模块 202中包括三个 LED支路， 分别用 Al、 A2和 A3表示。 第 n个 LED模块 203中包括三个 LED支路， 分别用 A4、 A5 和 A6表示。
所述检测及转换电路， 用于检测直流母线电压中携带的调节指令，将所述 调节指令转换为相应的控制信号分别发送给各个恒流电路。
如图 7所示， 第一检测及转换电路 202a的输入端连接直流母线电压 VI , 输出端分别连接各个恒流电路的控制端。 第 n检测及转换电路 203a的输入端 连接直流母线电压 VI , 输出端分别连接各个恒流电路的控制端。
所述恒流电路， 用于根据所述控制信号为对应的 LED支路提供稳定的电 流。
所述恒流电路可以为 Buck电路、 Boost电路、 Buck-Boost电路、 Flyback 电路、 Forword电路、 桥式电路、 推挽电路或 LLC谐振电路。 从图 7中可以看出，每个 LED模块中的每个 LED支路对应一个恒流电路。 需要说明的是， 每个 LED模块可以包含至少一个 LED支路， 两路以上的
LED支路可以是同一种颜色的灯， 也可以是不同颜色的灯； 不同 LED模块中 的 LED支路的颜色可以相同或不同。
下面结合图 8介绍图 7对应的具体实施例。
参见图 8, 该图为本发明提供的 LED模块的实施例结构图。
图 8中仅示出了一个 LED模块的内部结构， 是图 7对应的一个具体实施 例。 由于图 7中的每个 LED模块的内部结构相同， 因此， 以图 8中的 LED模 块是图 7中的第一个 LED模块为例进行介绍。
本实施例中的恒流电路具体可以由 DC/DC电路来实现 , 具体由 Buck电 路来实现。
检测及转换电路 202a的输出端连接每个 DC/DC电路中的控制电路，控制 电路的输出端连接开关管 S2, 通过控制 S2的闭合和断开， 从而使 Buck电路 的输出电流为设定值。
当通过直流母线电压的幅值传递调节指令时， 所述检测及转换电路 202a 检测直流母线电压的幅值， 并转换为控制 DC/DC电路的控制信号， 实现对每 路 LED支路电流的控制， 从而控制 LED模块整体的颜色和亮度。
当通过直流母线电压的交流纹波电压传递调节指令时，所述检测及转换电 路 202a检测交流纹波电压的特征参数，并转换为控制 DC/DC电路的控制信号， 实现对每路 LED支路电流的控制， 从而控制 LED模块整体的颜色和亮度。
下面介绍本发明实施例提供的另一种 LED模块， 参见图 9, 该图为本发 明提供的 LED调光系统的又一实施例结构图。
本实施例提供的每个 LED模块包括检测及转换电路、恒流电路、 N个 LED 支路和 N个控制开关； N为正整数；
每个 LED支路两端并联一个控制开关；
每个 LED模块中的 N个 LED支路串联在一起， 串联后的 LED支路的阳 极连接恒流电路的正输出端， 阴极接负输出端；
检测及转换电路， 用于检测直流母线电压中携带的调节指令，将所述调节 指令转换为控制信号发送给恒流电路； 或者，将所述调节指令发送开关信号给 各个控制开关；
恒流电路， 用于根据所述控制信号为串联后的 LED支路提供恒定电流。 如图 9所示的第一个 LED模块 202, 包括三个 LED支路， 分别为 R、 G 和 B, 每个 LED支路中的 LED灯的颜色相同。 其中 R串的 LED灯为红色、 G串的 LED灯为绿色、 B串的 LED灯为黄色。
R串 LED灯与第一控制开关 Sri并联； G串 LED灯与第二控制开关 Sr2 并联； R串 LED灯与第三控制开关 Sr3并联；
恒流电路可以是非隔离型的电路，如 Buck, Boost,或 Buck-Boost等电路； 也可以是隔离型的电路， 如 Flyback, Forword, 桥式电路， 推挽电路， 或 LLC 类谐振电路等。
检测及转换电路，检测直流母线电压的携带的调节指令的特征参数，按照 预先设定的特征参数编码规则输出控制信号给控制开关 Sri、 Sr2、 Sr3以及恒 流电路。
检测及转换电路可以通过控制恒流电路，控制其输出的电流幅值， 即调节 LED模块的总亮度； 可以通过控制控制开关 Srl、 Sr2、 Sr3的闭合和断开， 间 接控制 R串 LED灯、 G串 LED灯、 B串 LED灯的电流之间的占空比。
检测及转换电路通过控制 LED模块总电流的平均值来调节 LED模块的总 亮度。
检测及转换电路通过分别控制控制开关 Sri、 Sr2、 Sr3的闭合和断开， 分 别控制 R串 LED灯、 G串 LED灯、 B串 LED灯的电流之间的占空比， 从而 控制每种颜色的灯的电流平均值来调节 LED模块的整体颜色。
需要说明的是，本实施例以一个 LED模块中包含 R、 G和 B三串 LED灯， 即三个 LED支路； 还可以是： 两个或两个以上的 LED支路， 同一 LED模块 中， 不同的 LED支路可以是同一种颜色的灯， 也可以是不同颜色的灯； 不同 LED模块中的 LED支路的颜色可以相同或不同。
参见图 10, 该图为本发明提供的 LED模块的又一实施例结构图。
图 10所示的是第一 LED模块的内部结构图， 由于各个 LED模块的结构 相同， 因此， 仅以第一 LED模块为例进行介绍。
图 10提供的恒流电路采用非隔离型的 Buck电路来实现。 参见图 11 , 该图为本发明提供的 LED模块的另一实施例结构图。
每个 LED模块包括检测及转换电路、 N个 LED支路、 N个限流电路、 N 个限流控制电路； N为正整数；
每个 LED支路与一个限流电路串联， 每个限流电路对应一个限流控制电 路；
所有 LED支路并联在直流母线电压的两端；
检测及转换电路， 用于检测直流母线电压中携带的调节指令，将所述调节 指令转换为相应的控制信号分别发送给各个限流控制电路；
限流控制电路， 用于采样本 LED支路的电流， 根据所述控制信号控制限 流电路， 调节本 LED支路的电流。
如图 11所示， 以三个 LED支路为例进行介绍， 分别为 R支路、 G支路和 B支路。 每个支路对应一种颜色。
每个 LED支路的结构图是类似的， 下面仅以 R支路为例进行介绍。
限流控制电路 202b采集 R支路的电流，具体可以通过采样电阻 Rsl实现， 同时接收检测及转换电路 202a的控制信号 Isetl , 将采集的电流与 Isetl比较， 输出控制信号控制调整管 S1的电阻大小， 从而控制 R支路的电流。
如图 11所示， 限流电路 202c包括调整管 S1和采样电阻 Rsl ,
所述调整管 S1、 采样电阻 Rsl和 LED串联；
所述调整管 S1和采样电阻 Rsl的公共端连接所述限流控制电路 202b的一 个输入端；
限流控制电路 202b的输出端连接调整管 S1的控制端。
需要说明的是，每个 LED模块还可以包括一个 LED支路，所述 N个 LED 支路并联后与该一个 LED支路串联后连接在电压变换器输出端。
如图 11所示， 第一个 LED模块 202中的 R支路、 G支路和 B支路并联 后与 W支路串联。
本发明以上实施例提供的 LED调光系统， 使用一个集中调光模块使整个 系统在电网侧实现较高的功率因数， 从而可以降低电磁干扰。
以上所述，仅是本发明的较佳实施例而已，并非对本发明作任何形式上的限制。 虽然本发明已以较佳实施例揭露如上， 然而并非用以限定本发明。任何熟悉本 领域的技术人员，在不脱离本发明技术方案范围情况下，都可利用上述揭示的 方法和技术内容对本发明技术方案做出许多可能的变动和修饰，或修改为等同 变化的等效实施例。 因此， 凡是未脱离本发明技术方案的内容， 依据本发明的 技术实质对以上实施例所做的任何简单修改、等同变化及修饰， 均仍属于本发 明技术方案保护的范围内。

Claims

权 利 要 求
1、 一种 LED 调光系统， 其特征在于， 包括： 集中驱动模块、 至少一个 LED模块， 每个 LED模块包括至少一路 LED支路；
所述集中驱动模块的输入端连接电源，所述集中驱动模块用于接收表征调 节指令的控制信号， 输出直流母线电压给所述每个 LED模块， 所述直流母线 电压携带所述调节指令；
所述每个 LED模块， 用于检测所述直流母线电压携带的所述调节指令， 根据所述调节指令调节该 LED模块中的 LED支路的电流。
2、 根据权利要求 1所述的 LED调光系统， 其特征在于， 所述调节指令为 直流母线电压的幅值或交流纹波电压；
当所述调节指令为直流母线电压的幅值时，所述直流母线电压的不同幅值 大小代表不同的调节指令；
当所述调节指令为交流纹波电压时，所述交流纹波电压的至少一种特征参 数代表调节指令。
3、 根据权利要求 1或 2所述的 LED调光系统， 其特征在于， 所述集中驱 动模块包括： 电压变换器和输出电压控制电路；
所述输出电压控制电路，用于检测所述直流母线电压和接收所述表征控制 指令的控制信号， 生成调节控制信号输出给电压变换器；
所述电压变换器的输入端连接电源，用于根据调节控制信号输出直流母线 电压给每个 LED模块。
4、 根据权利要求 3所述的 LED调光系统， 其特征在于， 所述输出电压控 制电路包括集成运放、 第一分压电阻、 第二分压电阻、 第三电阻、 第四电阻和 补偿网络；
所述集成运放的负输入端通过第四电阻连接第一分压电阻和第二分压电 阻的公共端， 第一分压电阻另一端连接电压变换器的输出正端， 第二分压电阻 另一端连接电压变换器的输出负端；
所述集成运放的负输入端通过第三电阻连接所述表征控制指令的控制信 号；
所述集成运放的正输入端连接基准电压； 所述集成运放的输出端作为该输出电压控制电路的输出端连接所述电压 变换器；
所述集成运放的负输入端和输出端之间连接有所述补偿网络。
5、 根据权利要求 1所述的 LED调光系统， 其特征在于， 所述每个 LED 模块包括检测及转换电路和 N个 LED支路； N为正整数；
每个 LED支路中的 LED灯的颜色相同 , 每个 LED支路对应一个恒流电 路；
所述检测及转换电路， 用于检测直流母线电压中携带的调节指令，将所述 调节指令转换为相应的控制信号分别发送给各个恒流电路；
所述恒流电路， 用于根据所述控制信号为对应的 LED支路提供恒定的电 流。
6、 根据权利要求 1所述的调光系统， 其特征在于， 每个 LED模块包括检 测及转换电路、 恒流电路、 N个 LED支路和 N个控制开关； N为正整数； 每个 LED支路两端并联一个控制开关；
每个 LED支路中的 LED灯的颜色相同；
每个 LED模块中的 N个 LED支路串联在一起， 串联后的 LED支路的阳 极连接恒流电路的正输出端， 阴极接负输出端；
检测及转换电路， 用于检测直流母线电压中携带的调节指令，将所述调节 指令转换为控制信号发送给恒流电路； 或者，将所述调节指令发送开关信号给 各个控制开关；
恒流电路， 用于根据所述控制信号为串联后的 LED支路提供恒定电流。
7、 根据权利要求 5或 6所述的调光系统， 其特征在于， 所述恒流电路为 Buck电路、 Boost电路、 Buck-Boost电路、 Flyback电路、 Forword电路、 桥 式电路、 推挽电路或 LLC谐振电路。
8、 根据权利要求 1所述的调光系统， 其特征在于， 每个 LED模块包括检 测及转换电路、 N个 LED支路、 N个限流电路、 N个限流控制电路； N为正 整数；
每个 LED支路与一个限流电路串联， 每个限流电路对应一个限流控制电 路； 所有 LED支路并联在直流母线电压的两端；
检测及转换电路， 用于检测直流母线电压中携带的调节指令，将所述调节 指令转换为相应的控制信号分别发送给各个限流控制电路；
限流控制电路， 用于采样本 LED支路的电流， 根据所述控制信号控制限 流电路， 调节本 LED支路的电流。
9、 根据权利要求 8所述的调光系统， 其特征在于， 每个所述限流电路包 括调整管和采样电阻，
所述调整管、 采样电阻和 LED串联；
所述调整管和采样电阻的公共端连接所述限流控制电路的一个输入端； 限流控制电路的输出端连接调整管的控制端。
10、 根据权利要求 8或 9所述的调光系统， 其特征在于， 每个 LED模块 还包括一个 LED支路， 所述 N个 LED支路并联后与该一个 LED支路串联后 连接在电压变换器输出端。
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