CN102548101B - LED dimming system - Google Patents

Abstract

Translated fromChinese

本发明提供一种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。

The invention provides an LED dimming system, comprising: a centralized driving module, at least one LED module, each LED module includes at least one LED branch circuit; the input end of the centralized driving module is connected to a power supply, and the centralized driving module is controlled by receiving a representative adjustment command The signal is used to output the DC bus voltage to each LED module, and the DC bus voltage carries the adjustment instruction; each LED module is used to detect the adjustment instruction carried by the DC bus voltage, and adjust the LED branch in the LED module according to the adjustment instruction. circuit current. The LED dimming system provided by the present invention only uses one centralized driving module, has a simple structure and is convenient to control, therefore, the cost of the whole system is relatively low.

Description

Translated fromChinese

一种LED调光系统A kind of LED dimming system

技术领域technical field

本发明涉及调光技术领域，特别涉及一种LED调光系统。The invention relates to the technical field of dimming, in particular to an LED dimming system.

背景技术Background technique

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。At present, the dimming system of LED lighting follows the dimming system of incandescent lamps, because the cost of dimming system of incandescent lamps is relatively low. Referring to FIG. 1 , this figure shows the dimming system of LED lighting lamps in the prior art.

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A1、A2，一直到An。The dimming system of the LED lighting lamp includes anAC power supply 101, anAC chopper dimmer 102, n drivers and n LED branches. Among them, the n LED branches are A1, A2, and 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。The output end of theAC power supply 101 is connected to anAC chopper dimmer 102; theAC chopper dimmer 102 is used to uniformly dim n drivers connected in parallel. Each driver corresponds to one LED branch.

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：If the driver is arranged inside the LED light source, the LED light can be directly connected to the existing incandescent lighting system without changing the existing wiring method. But this will have the following disadvantages:

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。Each LED branch circuit has its own AC/DC driver, which will make the circuit and control of the whole dimming system more complicated, and increase the cost of the whole circuit.

发明内容Contents of the invention

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。The technical problem to be solved by the present invention is to provide an LED dimming system with simple circuit structure, convenient control and low cost.

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；An embodiment of the present invention provides an LED dimming system, including: a centralized drive module, at least one LED module, and each LED module includes at least one LED branch circuit;

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；The input end of the centralized drive module is connected to a power supply, and the centralized drive module receives a control signal representing an adjustment command, and is used to output a DC bus voltage to each LED module, and the DC bus voltage carries the adjustment command;

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。Each LED module is configured to detect the adjustment instruction carried by the DC bus voltage, and adjust the current of the LED branch in the LED module according to the adjustment instruction.

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；Preferably, the adjustment command is the amplitude of the DC bus voltage or the AC ripple voltage;

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；When the adjustment instruction is the amplitude of the DC bus voltage, different amplitudes of the DC bus voltage represent different adjustment instructions;

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。When the adjustment command is an AC ripple voltage, at least one characteristic parameter of the AC ripple voltage represents the adjustment command.

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；Preferably, the centralized drive module includes: a voltage converter and an output voltage control circuit;

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；The output voltage control circuit is used to detect the DC bus voltage and receive the control signal representing the control command, generate an adjustment control signal and output it to the voltage converter;

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。The input end of the voltage converter is connected to a power supply, and is used to output the DC bus voltage to each LED module according to the regulation control signal.

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、第三电阻和补偿网络；Preferably, the output voltage control circuit includes an integrated operational amplifier, a first voltage dividing resistor, a second voltage dividing resistor, a third resistor and a compensation network;

所述集成运放的负输入端通过第一分压电阻连接电压变换器的输出正端，通过第二分压电阻连接电压变换器的输出负端；The negative input terminal of the integrated operational amplifier is connected to the output positive terminal of the voltage converter through the first voltage dividing resistor, and connected to the output negative terminal of the voltage converter through the second voltage dividing resistor;

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；The negative input terminal of the integrated operational amplifier is connected to the control signal representing the control instruction through a third resistor;

所述集成运放的正输入端连接基准电压；The positive input terminal of the integrated operational amplifier is connected to a reference voltage;

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；The output terminal of the integrated operational amplifier is connected to the voltage converter as the output terminal of the output voltage control circuit;

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。The compensation network is connected between the negative input terminal and the output terminal of the integrated operational amplifier.

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；Preferably, each LED module includes a detection and conversion circuit and N LED branches; N is a positive integer;

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；The LED lights in each LED branch have the same color, and each LED branch corresponds to a constant current circuit;

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；The detection and conversion circuit is used to detect the adjustment command carried in the DC bus voltage, convert the adjustment command into a corresponding control signal and send it to each constant current circuit;

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。The constant current circuit is used to provide a constant current for the corresponding LED branch according to the control signal.

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。Preferably, the constant current circuit is 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.

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；Preferably, each LED module includes a detection and conversion circuit, a constant current circuit, N LED branches and N control switches; N is a positive integer;

每个LED支路两端并联一个控制开关；A control switch is connected in parallel at both ends of each LED branch;

每个LED支路中的LED灯的颜色相同；The LED lamps in each LED branch have the same color;

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；The N LED branches in each LED module are connected in series, the anode of the series connected LED branch is connected to the positive output terminal of the constant current circuit, and the cathode is connected to the negative output terminal;

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；The detection and conversion circuit is used to detect the adjustment instruction carried in the DC bus voltage, convert the adjustment instruction into a control signal and send it to the constant current circuit; or, send the adjustment instruction to each control switch as a switch signal;

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。The constant current circuit is used to provide a constant current for the LED branches connected in series according to the control signal.

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；Preferably, 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;

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；Each LED branch is connected in series with a current limiting circuit, and each current limiting circuit corresponds to a current limiting control circuit;

所有LED支路并联在直流母线电压的两端；All LED branches are connected in parallel at both ends of the DC bus voltage;

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；The detection and conversion circuit is used to detect the adjustment command carried in the DC bus voltage, convert the adjustment command into a corresponding control signal and send it to each current-limiting control circuit;

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。The current-limiting control circuit is used to sample the current of the LED branch, and control the current-limiting circuit according to the control signal to adjust the current of the LED branch.

优选地，每个所述限流电路包括调整管和采样电阻，Preferably, each of the current limiting circuits includes an adjusting tube and a sampling resistor,

所述调整管、采样电阻和LED串联；The adjustment tube, the sampling resistor and the LED are connected in series;

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；The common end of the adjusting tube and the sampling resistor is connected to an input end of the current limiting control circuit;

限流控制电路的输出端连接调整管的控制端。The output end of the current limiting control circuit is connected to the control end of the regulator tube.

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。Preferably, each LED module further includes an LED branch, and the N LED branches are connected in parallel, connected in series with the one LED branch, and then connected to the output end of the voltage converter.

与现有技术相比，本发明具有以下优点：Compared with the prior art, the present invention has the following advantages:

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。The LED dimming system provided by the present invention includes: a centralized drive module, at least one LED module, each LED module includes at least one LED branch circuit; the input end of the centralized drive module is connected to a power supply, and the centralized drive module receives a control signal representing an adjustment command, It is used to output the DC bus voltage to each LED module, and the DC bus voltage carries the adjustment instruction; each LED module is used to detect the adjustment instruction carried by the DC bus voltage, and adjust the LED branch in the LED module according to the adjustment instruction. current. The LED dimming system provided by the present invention only uses one centralized driving module, has a simple structure and is convenient to control, therefore, the cost of the whole system is relatively low.

附图说明Description of drawings

图1是现有技术中LED照明灯的调光系统；Fig. 1 is the dimming system of LED lighting lamp in the prior art;

图2是本发明提供的LED集中调光系统实施例一结构图；Fig. 2 is a structural diagram of Embodiment 1 of the LED centralized dimming system provided by the present invention;

图3是本发明提供的集中驱动模块的实施例结构图；Fig. 3 is the structural diagram of the embodiment of the centralized driving module provided by the present invention;

图4是本发明提供的集中驱动模块的另一实施例结构图；FIG. 4 is a structural diagram of another embodiment of the centralized drive module provided by the present invention;

图5是本发明提供的调节指令实施例一示意图；Fig. 5 is a schematic diagram of Embodiment 1 of an adjustment command provided by the present invention;

图6是本发明提供的调节指令又一实施例示意图；Fig. 6 is a schematic diagram of another embodiment of the adjustment instruction provided by the present invention;

图7是本发明提供的LED调光系统的另一实施例结构图；Fig. 7 is a structural diagram of another embodiment of the LED dimming system provided by the present invention;

图8是本发明提供的LED模块的实施例结构图；Fig. 8 is a structural diagram of an embodiment of an LED module provided by the present invention;

图9是本发明提供的LED调光系统的又一实施例结构图；Fig. 9 is a structural diagram of another embodiment of the LED dimming system provided by the present invention;

图10是本发明提供的LED模块的又一实施例结构图；Fig. 10 is a structural diagram of another embodiment of the LED module provided by the present invention;

图11是本发明提供的LED模块的另一实施例结构图。Fig. 11 is a structural diagram of another embodiment of the LED module provided by the present invention.

具体实施方式Detailed ways

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。In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

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。Refer to Fig. 2, which is a structure diagram of Embodiment 1 of the LED centralized dimming system provided by the present invention.

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；The LED dimming system provided by the embodiment of the present invention includes: acentralized driving module 201, at least one LED module, and each LED module includes at least one LED branch circuit;

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。As shown in FIG. 2 , all LED modules are connected in parallel, and only thefirst LED module 202 and thenth LED module 203 are shown in FIG. 2 .

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V1给所述每个LED模块供电，所述直流母线电压V1携带所述调节指令；The input terminal of thecentralized driving module 201 is connected to the power supply Vin, and thecentralized driving module 201 receives a control signal representing an adjustment command, and is used to output a DC bus voltage V1 to supply power to each LED module, and the DC bus voltage V1 carries the adjustment command ;

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。It should be noted that Vin can be an AC voltage or a DC voltage; when Vin is an AC voltage, thecentralized driving module 201 also has a rectification function.

所述每个LED模块，用于检测所述直流母线电压V1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。Each LED module is configured to detect the adjustment instruction carried by the DC bus voltage V1, and adjust the current of the LED branch in the LED module according to the adjustment instruction.

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。The LED dimming system provided by the present invention includes: a centralized drive module, at least one LED module, each LED module includes at least one LED branch circuit; the input end of the centralized drive module is connected to a power supply, and the centralized drive module receives a control signal representing an adjustment command, It is used to output the DC bus voltage to each LED module, and the DC bus voltage carries the adjustment instruction; each LED module is used to detect the adjustment instruction carried by the DC bus voltage, and adjust the LED branch in the LED module according to the adjustment instruction. current. The LED dimming system provided by the present invention only uses one centralized driving module, has a simple structure and is convenient to control, therefore, the cost of the whole system is relatively low.

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。Referring to Fig. 3, this figure is a structural diagram of an embodiment of the centralized driving module provided by the present invention.

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；The centralized driving module provided in this embodiment includes: avoltage converter 201a and an output voltage control circuit 201b;

所述输出电压控制电路201b，用于检测所述直流母线电压V1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；The output voltage control circuit 201b is configured to detect the DC bus voltage V1 and receive the control signal V2 representing the adjustment instruction, generate an adjustment control signal and output it to thevoltage converter 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V1给每个LED模块。The input end of thevoltage converter 201a is connected to the power supply Vin, and is used to output the DC bus voltage V1 to each LED module according to the regulation control signal.

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。The control signal V2 representing the adjustment instruction 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.

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。The following describes the specific implementation of the output voltage control circuit 201b in conjunction with FIG. 4 . Referring to FIG. 4 , this figure is a structural diagram of another embodiment of the centralized driving module provided by the present invention.

所述输出电压控制电路201b包括集成运放IC、第一分压电阻R1、第二分压电阻R2、第三电阻R3和补偿网络；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 and a compensation network;

所述比较器IC的负输入端通过第一分压电阻R1连接电压变换器201a的输出正端，通过第二分压电阻R2连接电压变换器201a的输出负端；The negative input terminal of the comparator IC is connected to the output positive terminal of thevoltage converter 201a through the first voltage dividing resistor R1, and connected to the output negative terminal of thevoltage converter 201a through the second voltage dividing resistor R2;

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；The negative input terminal of the integrated operational amplifier IC is connected to the control signal V2 representing the control command through the third resistor R3;

所述集成运放IC的正输入端连接基准电压Vref；The positive input terminal of the integrated operational amplifier IC is connected to the reference voltage 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；The output terminal of the integrated operational amplifier IC is connected to thevoltage converter 201a as the output terminal of the output voltage control circuit 201b;

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。The compensation network is connected between the negative input terminal and the output terminal of the integrated operational amplifier IC.

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；The adjustment instruction may be the amplitude of the DC bus voltage or the AC ripple voltage;

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；When the adjustment instruction is the amplitude of the DC bus voltage, different amplitudes of the DC bus voltage represent different adjustment instructions;

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。When the adjustment command is an AC ripple voltage, at least one characteristic parameter of the AC ripple voltage represents the adjustment command.

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。The characteristic parameter of the AC ripple voltage may be at least one of the amplitude, peak-to-peak value, frequency, duty cycle, high voltage time, and low voltage time of the AC ripple voltage.

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。The adjustment instruction can be encoded according to a predetermined encoding rule, and different encodings represent different adjustment instructions.

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。The AC ripple voltage may be a pulse signal, a sinusoidal signal, a triangular wave signal, or a trapezoidal signal.

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。The implementation manner in which the adjustment command is the amplitude of the DC bus voltage or the characteristic parameter of the AC ripple voltage is described in detail below with reference to FIG. 5 and FIG. 6 .

参见图5，该图为本发明提供的调节指令实施例一示意图。Referring to FIG. 5 , this figure is a schematic diagram of Embodiment 1 of an adjustment command provided by the present invention.

图5所示的是通过直流母线电压的幅值来检测调节指令。Figure 5 shows that the regulation command is detected by the magnitude of the DC bus voltage.

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V1的幅值，从而向LED模块传递调节指令。A specific implementation may be: changing the amplitude of the DC bus voltage V1 by changing the amplitude of the control signal V2 representing the adjustment instruction, so as to transmit the adjustment instruction to the LED module.

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。It should be noted that the adjustment instruction may include a light adjustment instruction and a color adjustment instruction, or may only include one of them. Among them, dimming refers to adjusting brightness, and toning refers to adjusting color.

现在假设直流母线电压V1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的调节指令。It is now assumed that the magnitude of the DC bus voltage V1 can transmit both an adjustment instruction for adjusting brightness and an adjustment instruction for adjusting color.

直流母线电压V1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。The amplitude variation range of the DC bus voltage V1 can be divided into different sub-intervals, and different sub-intervals represent different adjustment commands.

例如，可以将V1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。For example, the variation range of V1 can be divided into two sub-intervals, each sub-interval represents a type of an adjustment instruction.

如图5所示，V1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。As shown in FIG. 5 , the range of amplitude variation of V1 is (300V, 400V), which is divided into two intervals, the first sub-interval (300V, 350V) and the second sub-interval (350V, 400V). Set the first sub-interval (300V, 350V) as the interval for adjusting the color; the second sub-interval (350V, 400V) as the interval for adjusting the brightness; or the first sub-interval (300V, 350V) as the interval for adjusting the brightness; the second The sub-interval (350V, 400V) is the interval for adjusting the color.

可以理解的是，V1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。It can be understood that the number of sub-intervals and the length of each sub-interval set for the V1 amplitude variation range can be set according to actual needs, which are not specifically limited in this embodiment.

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。In the interval representing the brightness adjustment, multiple intervals can be further divided, and each interval represents a brightness level; in the interval representing the adjustment color, multiple intervals can be continuously divided, and each interval represents a color.

如果用于单一的调光或调色系统，则直流母线电压V1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。If it is used in a single dimming or coloring system, the amplitude of the DC bus voltage V1 is only used to transmit a single dimming command or coloring command, and the method is similar to the example described in FIG. 5 .

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。The implementation manner of transmitting the adjustment command by superimposing the AC ripple voltage on the DC bus voltage will be described below with reference to FIG. 6 .

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。Referring to FIG. 6 , this figure is a schematic diagram of another embodiment of the adjustment instruction provided by the present invention.

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。In this embodiment, the adjustment instruction is transmitted through the characteristic parameters of the AC ripple voltage.

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。The following takes the characteristic parameters of the AC ripple voltage as an example to transmit an adjustment instruction for adjusting brightness and an adjustment instruction for adjusting color as an example.

例如，直流母线电压V1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。For example, the two characteristic parameters of the superimposed AC ripple voltage on the DC bus voltage V1 transmit the adjustment color and the adjustment brightness respectively, such as setting the frequency transmission adjustment color of the AC ripple voltage; the duty ratio transmission adjustment of the AC ripple voltage brightness.

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。Each frequency point or frequency segment of the AC ripple voltage corresponds to a color of light. The current value of each LED branch corresponding to each color is set in the LED module in advance. After the LED module detects the frequency of the AC ripple voltage superimposed on the DC bus voltage, it searches for the current value of each LED branch circuit corresponding to the frequency, so as to provide a corresponding current value for each LED branch circuit.

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。In another way, different duty ratios of the AC ripple voltage correspond to different brightness of the LED lamp. Pre-set the current value corresponding to the different brightness of the LED lamp in the LED module. After the LED module detects the duty cycle of the AC ripple voltage superimposed on the DC bus voltage, it searches for the current value of each LED branch corresponding to the duty cycle. , so as to provide corresponding current values for each LED branch.

如图6所示，仅示出了V2和V1的波形图，其中V2是脉冲波，V1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。As shown in FIG. 6 , only the waveform diagrams of V2 and V1 are shown, wherein V2 is a pulse wave, and V1 is a DC bus voltage superimposed with an AC ripple signal. It can be seen from FIG. 6 that the duty ratio corresponding to the first adjustment instruction is larger than the duty ratio of the second adjustment instruction.

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。If used in a single dimming or color adjustment system, any characteristic parameter of the AC ripple voltage is only used to transmit a single adjustment command for color adjustment or color adjustment, and the method is similar to the example described in FIG. 6 .

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。The LED module in the LED dimming system provided by the present invention will be described in detail below with reference to the accompanying drawings.

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。Referring to FIG. 7 , it is a structural diagram of another embodiment of the LED dimming system provided by the present invention.

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；Each LED module provided in this embodiment includes a detection and conversion circuit and N LED branches; N is a positive integer;

如图7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。As shown in FIG. 7 , only two of the LED modules are shown, namely thefirst LED module 202 and thenth LED module 203 . Each LED module includes three LED branches.

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A1、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。The color of the LED lights in each LED branch is the same, and each LED branch corresponds to a constant current circuit; A3 said. Thenth LED module 203 includes three LED branches, denoted by A4, A5 and A6 respectively.

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。The detection and conversion circuit is used to detect the adjustment instruction carried in the DC bus voltage, convert the adjustment instruction into a corresponding control signal and send it to each constant current circuit respectively.

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V1，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V1，输出端分别连接各个恒流电路的控制端。As shown in FIG. 7 , the input end of the first detection andconversion circuit 202 a is connected to the DC bus voltage V1 , and the output end is respectively connected to the control ends of each constant current circuit. The input end of the nth detection and conversion circuit 203a is connected to the DC bus voltage V1, and the output end is respectively connected to the control ends of each constant current circuit.

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。The constant current circuit is used to provide a stable current for the corresponding LED branch according to the control signal.

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。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.

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。It can be seen from FIG. 7 that each LED branch in each LED module corresponds to a constant current circuit.

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。It should be noted that each LED module can contain at least one LED branch, and more than two LED branches can be lights of the same color or lights of different colors; the colors of the LED branches in different LED modules Can be the same or different.

下面结合图8介绍图7对应的具体实施例。The specific embodiment corresponding to FIG. 7 will be introduced below with reference to FIG. 8 .

参见图8，该图为本发明提供的LED模块的实施例结构图。Refer to Fig. 8, which is a structural diagram of an embodiment of the LED module provided by the present invention.

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。FIG. 8 only shows the internal structure of one LED module, 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 for introduction.

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。The constant current circuit in this embodiment may be implemented specifically by a DC/DC circuit, specifically by a Buck circuit.

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。The output end of the detection andconversion circuit 202a is connected to the control circuit in each DC/DC circuit, the output end of the control circuit is connected to the switch tube S2, and the output current of the Buck circuit is set to a set value by controlling the closing and opening of S2 .

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。When the adjustment instruction is transmitted through the amplitude of the DC bus voltage, the detection andconversion circuit 202a detects the amplitude of the DC bus voltage and converts it into a control signal for controlling the DC/DC circuit, so as to realize the control of the current of each LED branch , so as to control the overall color and brightness of the LED module.

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。When the adjustment command is transmitted through the AC ripple voltage of the DC bus voltage, the detection andconversion circuit 202a detects the characteristic parameters of the AC ripple voltage and converts it into a control signal for controlling the DC/DC circuit, so as to realize the control of each LED branch. Current control, thereby controlling the overall color and brightness of the LED module.

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。Another LED module provided by the embodiment of the present invention is introduced below, see FIG. 9 , which is a structural diagram of another embodiment of the LED dimming system provided by the present invention.

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；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;

每个LED支路两端并联一个控制开关；A control switch is connected in parallel at both ends of each LED branch;

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；The N LED branches in each LED module are connected in series, the anode of the series connected LED branch is connected to the positive output terminal of the constant current circuit, and the cathode is connected to the negative output terminal;

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；The detection and conversion circuit is used to detect the adjustment instruction carried in the DC bus voltage, convert the adjustment instruction into a control signal and send it to the constant current circuit; or, send the adjustment instruction to each control switch as a switch signal;

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。The constant current circuit is used to provide a constant current for the LED branches connected in series according to the control signal.

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。Thefirst LED module 202 shown in FIG. 9 includes three LED branches, respectively R, G and B, and the LED lamps in each LED branch have the same color. The LED lights of the R string are red, the LED lights of the G string are green, and the LED lights of the B string are yellow.

R串LED灯与第一控制开关Sr1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；R strings of LED lights are connected in parallel with the first control switch Sr1; G strings of LED lights are connected in parallel with the second control switch Sr2; R strings of LED lights are connected in parallel with the third control switch Sr3;

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。The constant current circuit can be a non-isolated circuit, such as Buck, Boost, or Buck-Boost, or an isolated circuit, such as Flyback, Forword, bridge circuit, push-pull circuit, or LLC resonant circuit.

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Sr1、Sr2、Sr3以及恒流电路。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 Sr1, Sr2, Sr3 and the constant current circuit according to the preset characteristic parameter coding rules.

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Sr1、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。The detection and conversion circuit can control the output current amplitude by controlling the constant current circuit, that is, adjust the total brightness of the LED module; it can indirectly control the R series of LED lights, The duty cycle between the current of G string LED lights and B string LED lights.

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。The detection and conversion circuit adjusts the total brightness of the LED module by controlling the average value of the total current of the LED module.

检测及转换电路通过分别控制控制开关Sr1、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。The detection and conversion circuit respectively controls the closing and opening of the control switches Sr1, Sr2, and Sr3, respectively controls the duty ratio between the currents of the R string LED lights, the G string LED lights, and the B string LED lights, thereby controlling each color. The average value of the lamp current to adjust the overall color of the LED module.

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。It should be noted that in this embodiment, one LED module contains three strings of LED lamps R, G, and B, that is, three LED branches; it can also be: two or more LED branches, in the same LED module , different LED branches can be lights of the same color, or lights of different colors; the colors of the LED branches in different LED modules can be the same or different.

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。Referring to FIG. 10 , it is a structural diagram of another embodiment of the LED module provided by the present invention.

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。FIG. 10 shows the internal structure diagram of the first LED module. Since each LED module has the same structure, only the first LED module is used as an example for introduction.

图10提供的恒流电路采用非隔离型的Buck电路来实现。The constant current circuit provided in Figure 10 is realized by a non-isolated Buck circuit.

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。Refer to FIG. 11 , which is a structural diagram of another embodiment of the LED module provided by the present invention.

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；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;

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；Each LED branch is connected in series with a current limiting circuit, and each current limiting circuit corresponds to a current limiting control circuit;

所有LED支路并联在直流母线电压的两端；All LED branches are connected in parallel at both ends of the DC bus voltage;

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；The detection and conversion circuit is used to detect the adjustment command carried in the DC bus voltage, convert the adjustment command into a corresponding control signal and send it to each current-limiting control circuit;

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。The current-limiting control circuit is used to sample the current of the LED branch, and control the current-limiting circuit according to the control signal to adjust the current of the LED branch.

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。As shown in Figure 11, three LED branches are taken as an example for introduction, namely R branch, G branch and B branch. Each branch corresponds to a color.

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。The structure diagram of each LED branch is similar, and the following only uses the R branch as an example to introduce.

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Rs1实现，同时接收检测及转换电路202a的控制信号Iset1，将采集的电流与Iset1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。The current limitingcontrol circuit 202b collects the current of the R branch, which can be realized specifically through the sampling resistor Rs1, and at the same time receives the control signal Iset1 of the detection andconversion circuit 202a, compares the collected current with Iset1, and outputs the control signal to control and adjust the resistance of the tube S1 , thus controlling the current of the R branch.

如图11所示，限流电路202c包括调整管S1和采样电阻Rs1，As shown in FIG. 11 , the current limitingcircuit 202c includes an adjusting transistor S1 and a sampling resistor Rs1,

所述调整管S1、采样电阻Rs1和LED串联；The adjustment tube S1, the sampling resistor Rs1 and the LED are connected in series;

所述调整管S1和采样电阻Rs1的公共端连接所述限流控制电路202b的一个输入端；The common end of the adjusting tube S1 and the sampling resistor Rs1 is connected to an input end of the current limitingcontrol circuit 202b;

限流控制电路202b的输出端连接调整管S1的控制端。The output end of the current limitingcontrol circuit 202b is connected to the control end of the regulating transistor S1.

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。It should be noted that each LED module may also include an LED branch, and the N LED branches are connected in parallel and connected in series with the one LED branch and then connected to the output end of the voltage converter.

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。As shown in FIG. 11 , the R branch, the G branch and the B branch in thefirst LED module 202 are connected in parallel and connected in series with the W branch.

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。The LED dimming system provided by the above embodiments of the present invention uses a centralized dimming module to enable the entire system to achieve a higher power factor on the grid side, thereby reducing electromagnetic interference.

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。The above descriptions are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present invention, can use the methods and technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent of equivalent change Example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention, which do not deviate from the technical solution of the present invention, still fall within the protection scope of the technical solution 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.

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