CN101657876B - 色温可调谐白光光源 - Google Patents

色温可调谐白光光源 Download PDF

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CN101657876B
CN101657876B CN2008800119719A CN200880011971A CN101657876B CN 101657876 B CN101657876 B CN 101657876B CN 2008800119719 A CN2008800119719 A CN 2008800119719A CN 200880011971 A CN200880011971 A CN 200880011971A CN 101657876 B CN101657876 B CN 101657876B
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led
light
phosphor
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arranges
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CN101657876A (zh
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李依群
董翊
徐晓峰
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Bridgelux Inc
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers

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Abstract

本发明提供一种色温可调谐白光光源，其包括：第一和第二LED布置，其可操作以分别发射第一和第二波长范围的光，所述第一和第二LED布置经配置以使得其经组合的光输出在色彩上看起来为白色，所述经组合的光输出包括由所述源产生的光。一个或两个LED布置包括提供于关联的LED的远端的磷光体，所述关联的LED可操作以产生激励辐射，且照射所述磷光体，使得其发射不同波长范围的光，其中由所述LED布置发射的所述光包括来自所述LED和磷光体的经组合的光。可例如通过借由控制所述LED的驱动电流的相对量值或经脉冲宽度调制的驱动电流的工作周期而控制所述LED布置的相对光输出来调谐所输出的白光的色温。

Description

色温可调谐白光光源
技术领域
本发明涉及一种色温可调谐白光光源，且明确地说，涉及一种基于发光二极管布置的光源。此外，本发明提供一种产生具有选定色温的白光的方法。
背景技术
如所已知，通过将白光光源的色调与理论的经加热黑体辐射器进行比较来确定白光光源的相关色温(CCT)。CCT以开尔文(K)为单位指定，且对应于黑体辐射器的温度，所述黑体辐射器辐射与所述光源相同色调的白光。如今，来自白光光源的色温主要由用于产生光的机制决定。举例来说，白炽光源总是给出约3000K的相对较低的色温，被称为“暖白”。相反，荧光总是给出约7000K的较高色温，被称为“冷白”。在购买光源时或在建筑设计或构造完成时确定暖白或冷白的选择。在许多情形下，例如街道照明，暖白光和冷白光一起使用。
白光发光二极管(LED)是此项技术中众所周知的，且是相对较新近的技术革新。直到开发出在电磁谱的蓝光/紫外线部分中发射的LED为止，开发基于LED的白光光源才变得实际。如所已知，产生白光的LED(“白光LED”)包含一种磷光体材料，即发光材料，其吸收由LED发射的辐射的一部分，且重新发射不同色彩(波长)的辐射。通常，LED裸片或芯片产生光谱的可见部分中的蓝光，且磷光体重新发射黄光或绿光与红光、绿光与黄光或黄光与红光的组合。由LED产生的可见蓝光的未被磷光体吸收的部分与所发射的黄光混合，以提供眼睛看起来色彩为白色的光。白光LED的CCT由并入LED中的磷光体成分决定。
预测白光LED有可能代替白炽、荧光和氖光源，因为白光LED的操作寿命较长，可能数十万个小时，且白光LED在低能耗方面是高效率的。最近，已使用高亮度白光LED来代替常规的白色荧光、汞蒸气灯和氖灯。类似于其它照明源，白光LED的CCT是固定的，且由用于制造LED的磷光体成分决定。
US 7,014,336揭示产生高质量白光的系统和方法，所述白光是在人眼的亮视觉响应(光谱传递函数)内具有大体上连续的光谱的白光。由于眼睛的亮视觉响应给出眼睛可看到的事物的限制的量度，因此这在具有波长范围400nm(紫外线)到700nm(红外线)的高质量白光上设定了边界。一种用于形成白光的系统包括三百个LED，其每一者具有较窄的光谱宽度和最大光谱峰值，跨越400到700nm波长范围的预定部分。通过选择性地控制LED中的每一者的强度，可控制色温(以及色彩)。另一照明灯具包括九个LED，其具有在波长范围上每25nm间隔开的25nm谱宽。可通过调节九个LED的相对强度来调节LED的功率以产生某一范围的色温(以及色彩)。还提出使用较少的LED来产生白光，前提是每一LED具有增加的谱宽以维持满足眼睛的亮视觉响应的大体上连续的光谱。另一照明灯具包括使用一个或一个以上白光LED，且提供光学高通滤波器以改变白光的色温。通过提供一系列可互换的滤波器，此通过为各个滤波器指定一系列范围来允许单个灯具产生任何温度的白光。
本发明试图提供一种色温至少部分可调谐的白光光源。
发明内容
根据本发明，一种色温可调谐白光光源包括：第一发光二极管LED布置，其可操作以发射第一波长范围的光；以及第二发光二极管LED布置，其可操作以发射第二波长范围的光，所述LED布置经配置以使得其经组合的光输出(其包括所述源的输出)在色彩上看起来为白色；所述色温可调谐白光光源的特征在于第一LED布置包括提供于关联的第一LED的远端的磷光体，所述第一LED可操作以产生选定波长范围的激励能量，且照射所述磷光体，使得其发射不同波长范围的光，其中第一LED布置所发射的光包括来自第一LED的经组合的光以及从磷光体发射的光；以及控制构件，其可操作以通过控制两个LED布置的相对光输出来控制色温。在本专利申请案的上下文中，“远端”意味着磷光体在LED的制造期间未并入在LED内。
在一种布置中，第二LED布置也包含相应的磷光体，其提供于关联的第二LED的远端，所述第二LED可操作以产生选定波长范围的激励能量，且照射所述磷光体，使得其发射不同波长范围的光，其中第二LED布置所发射的光包括来自第二LED的经组合的光以及从磷光体发射的光，且其中控制构件可操作以通过控制磷光体的相对照射来控制色温。
可通过使用(例如)分压器布置控制相应LED的驱动电流的相对量值来调谐色温。或者，可动态地切换驱动电流，且通过控制驱动电流的工作周期以控制每一LED发射光的时间的相对比例来调谐色温。在此布置中，控制构件可包括经脉冲宽度调制(PWM)的电源，其可操作以产生PWM驱动电流，所述PWM驱动电流的工作周期用于选择所要的色温。优选的是，在PWM驱动电流的相反相位上驱动发光二极管。本发明的特定优点在于仅使用两个LED布置，因为此允许通过控制两个相对驱动电流来调谐色温，这可使用简单且便宜的驱动电路来容易地实施。
在一种布置中，第一和第二LED布置发射不同色彩的光，当组合这些光时，所述光在色彩上看起来为白色。此产生白光的布置的优点是与其中LED布置各产生不同色温的白光的布置相比具有改进的性能，特别是较低的吸收率。在一种此布置中，磷光体发射绿光或黄光，且第二LED布置发射红光。优选的是，用于激励磷光体的第一LED可操作以发射波长范围为440nm到470nm的光，即蓝光。
在另一布置中，第一LED布置所发射的光包括具有在2500K到4000K的范围内的色温的暖白(WW)光，且第二LED布置所发射的光包括具有在6000K到10,000K的范围内的色温的冷白(CW)光。优选的是，WW光的色度坐标CIE(x，y)为(0.44，0.44)，且CW光的色度坐标CIE(x，y)为(0.3，0.3)。
在另一布置中，第一磷光体发射色度坐标CIE(x，y)为(0.22，0.275)的绿光，且第二磷光体发射色度坐标CIE(x，y)为(0.54，0.46)的桔黄光。优选的是，用于激励磷光体的LED可操作以发射在440到470nm的波长范围内的光。
在另一布置中，磷光体共享共用的激励源，使得第二LED布置包括提供于第一LED的远端的相应磷光体，且其中第一LED可操作以产生用于两个磷光体的激励能量，且所述源进一步包括与每一磷光体关联的的相应光控制器，且控制构件可操作以通过控制光控制器以控制磷光体的相对照射来选择色温。优选的是，光控制器包括液晶遮光器，用于控制到达关联的磷光体的激励能量的强度。有了LCD遮光器，控制构件有利地可操作以通过控制相应LCD遮光器的相对驱动电压来选择色温。或者，控制构件可操作以动态地切换LCD遮光器的驱动电压，且可通过控制所述电压的工作周期来调谐色温。优选的是，控制构件包括经脉冲宽度调制的电源，其可操作以产生经脉冲宽度调制的驱动电压。
为了提高光输出的强度，所述源包括多个第一和第二LED布置，其有利地以阵列(例如正方形阵列)形式配置，以改进输出光的色彩均一性。
由于色温是可调谐的，因此本发明的光源特别适用于街道照明、车头灯/雾灯或其中所述源在可见性被(例如)湿气、雾、灰尘或烟削弱的环境中操作的应用。有利的是，所述源进一步包括传感器，用于检测光源可在其中操作的大气环境中的湿气的存在，且控制构件进一步可操作以响应于所述传感器而控制色温。
根据本发明，一种产生具有可调谐色温的白光的方法包括：提供第一发光二极管LED布置，并操作其发射第一波长范围的光；以及提供第二发光二极管LED布置，并操作其发射第二波长范围的光，所述LED布置经配置以使得其经组合的光输出在色彩上看起来为白色；所述方法的特征在于：第一LED布置包括提供于关联的第一LED的远端的磷光体，所述第一LED可操作以产生选定波长范围的激励能量，且照射所述磷光体，使得其发射不同波长范围的光，其中第一LED布置所发射的光包括来自第一LED的经组合的光以及从磷光体发射的光；以及通过控制两个LED布置的相对光输出来控制色温。
关于根据本发明的光源，第二LED布置可包括提供于关联的第二LED的远端的相应磷光体，所述第二LED可操作以产生选定波长范围的激励能量，且照射所述磷光体，使得其发射不同波长范围的光，其中第二LED布置所发射的光包括来自第二LED的经组合的光以及从磷光体发射的光，且通过控制磷光体的相对照射来控制色温。
所述方法进一步包括通过控制相应LED的驱动电流的相对量值来控制色温。或者，可动态地切换相应LED的驱动电流，且控制驱动电流的工作周期以控制色温。有利的是，所述方法进一步包括：产生经脉冲宽度调制的驱动电流；以及在所述驱动电流的相反相位上操作相应的LED。
在第二LED布置包括提供于第一LED的远端的相应磷光体且其中第一LED可操作以产生用于两个磷光体的激励能量的情况下，所述方法进一步包括：提供与每一磷光体关联的的相应光控制器；以及通过控制光控制器以控制磷光体的相对照射来控制色温。可通过控制相应光控制器的相对驱动电压来控制色温。或者，可动态地切换光控制器的驱动电压，且通过控制所述电压的工作周期来控制色温。
根据本发明，一种色温可调谐白光光源包括：第一发光二极管布置，其可操作以发射第一波长范围的光；以及第二发光二极管布置，其可操作以发射第二波长范围的光，所述发光二极管布置经配置以使得其经组合的光输出(其包括所述源的输出)在色彩上看起来为白色；所述色温可调谐白光光源的特征在于传感器，用于检测光源可在其中操作的大气环境中的湿气的存在；以及控制构件，其可操作以响应于所述传感器而控制两个发光二极管布置的相对光输出，以设定所发射的白光的选定色温。
根据本发明的另一方面，一种色温可调谐白光光源包括：第一和第二发光二极管布置，其包括相应的磷光体以及至少一个发光二极管，所述发光二极管可操作以产生选定波长范围的激励能量，且照射磷光体，使得每一磷光体发射不同波长范围的光，其中分别由每一发光二极管布置发射的光包括来自发光二极管的经组合的光以及从磷光体发射的光，所述发光二极管布置经配置以使得其经组合的光输出(其包括所述源的输出)在色彩上看起来为白色；所述色温可调谐白光光源的特征在于可控制的光控制器，其与每一磷光体关联，且可操作以控制磷光体的相对照射；以及控制构件，其可操作以通过控制光控制器来选择色温。
附图说明
为了更好地理解本发明，现在将参考附图仅以举例方式描述本发明的实施例，其中：
图1a和图1b是根据本发明的色温可调谐白光光源的示意性表示；
图2是用于操作图1的光源的驱动器电路；
图3是图1的源的针对选定色温的输出光强度对波长的曲线图；
图4是指示各种磷光体的色度坐标的国际照明委员会(CIE)xy色度图；
图5是针对选定色温的输出光强度对波长的曲线图；
图6是用于操作图1的光源的另一驱动器电路；
图7是用于操作图1的光源的经脉冲宽度调制的驱动器电路；以及
图8是根据本发明的另一色温可调谐白光光源的示意性表示。
具体实施方式
参看图1a，其展示根据本发明的色温可调谐(可选择)白光光源1的示意性表示，所述色温可调谐(可选择)白光光源1包括第一发光二极管(LED)布置2和第二LED布置3的阵列。在实例中，所述阵列包括二十五个LED布置(十三个第一LED布置和十二个第二LED布置)的规则正方形阵列。将了解，本发明不限于特定数目的LED布置或特定几何布局。第一LED布置2中的每一者可操作以发射暖白(WW)光4，且第二LED布置3中的每一者可操作以发射冷白(CW)光5。在此专利申请案中，WW光为具有在2500K到4000K的范围内的色温的白光，且CW光为具有在6000K到10000K的范围内的色温的白光。经组合的由LED布置2、3发射的光4和5包括源1的光输出6，且在色彩上将看起来为白色。如所描述，输出光6的色温取决于CW和WW光成分的相对比例。LED布置2、3中的每一者包括提供于关联的LED 9、10的远端的磷光体材料区7、8。LED 9、10可操作以产生选定波长范围的激励能量11、12，且照射磷光体，使得其发射不同波长范围的光13、14，且所述布置经配置以使得LED布置所发射的光4、5包括来自LED的经组合的光11、12以及从磷光体发射的光13、14。通常，LED 9、10包括蓝光/UV LED和磷光体区7、8(有色磷光体的混合物)，使得其光输出在色彩上看起来为白色。
参看图2，其展示用于操作图1的光源1的驱动器电路20的示意性表示。驱动器电路20包括可变电阻器21Rw，其用于控制到达第一和第二LED布置2、3的相对驱动电流IA和IB。每一LED布置2、3的LED9、10串连连接，且所述LED布置并联连接到可变电阻器21。将可变电阻器21配置为分压器，且将其用于选择相对驱动电流IA和IB，以实现选定的相关色温(CCT)。
图3是图1的光源的针对选定CCT 2600到7800K的输出光强度(任意单位)对波长(nm)的曲线图。通过改变驱动电流IA和IB的相对量值来产生不同色温的白光。表1将针对驱动电流的选定比率IA/IB和色温CCT(K)的色度坐标CIE(x，y)制成表格。
  CCT(K)   IA/IB   CIE(x)   CIE(y)
  7800   8/92   0.300   0.305
  7500   10/90   0.305   0.310
  7000   14/86   0.310   0.313
  6500   20/80   0.317   0.317
  6000   27/73   0.324   0.321
  5500   34/66   0.334   0.328
  5000   40/60   0.342   0.333
  4500   46/54   0.354   0.340
  4000   55/45   0.369   0.350
  3500   68/32   0.389   0.362
  3000   83/17   0.418   0.380
  2600   97/3   0.452   0.400
表1.针对驱动电流的选定比率IA/IB和相关色温CCT(K)的色度坐标CIE(x，y)
在替代光源中，第一和第二LED布置2、3可操作以发射不同的有色光4、5(即除白色之外)，其在组合在一起时构成眼睛看起来色彩为白色的光。在一个此光源中，第一LED布置包括发射色度坐标CIE(x，y)为(0.22，0.275)的蓝-绿光，且第二LED布置包括发射色度坐标CIE(x，y)为(0.54，0.46)的桔黄光。同样，通过控制到达LED布置的驱动电流的相对量值来调谐输出白光的色温。图4是指示分别用于第一和第二LED布置的色度坐标40、41的针对此源的国际照明委员会(CIE)1931xy色度图。连接两个点40、41的线42表示可通过改变驱动电流IA和IB的量值而由所述源产生的输出光的可能色温。图4中还指示由美国加利福尼亚州佛里蒙特地区的英特美光电公司(IntematixCorporation)制造的磷光体的色度坐标。图5是源的针对选定色温的输出光强度对波长的曲线图，其中第一LED发射色度坐标CIE(x，y)为(0.22，0.275)的蓝-绿光，且第二LED发射色度坐标CIE(x，y)为(0.54，0.46)的桔黄光。与使用两个白光LED布置相比，使用两个不同颜色的LED布置来产生白光的优点是改进的性能，特别是较低的吸收率。表2将包括桔黄和蓝-绿LED的源的针对时间上的驱动电流的选定比率IA/IB和色温CCT(K)的色度坐标CIE(x，y)制成表格。
  CCT(K)   IA/IB   CIE(x)   CIE(y)
  8000   42/58   0.300   0.305
  7500   45/55   0.305   0.310
  7000   48/52   0.310   0.313
  6500   51/49   0.317   0.317
  6000   54/46   0.324   0.321
  5500   58/42   0.334   0.328
  5000   61/39   0.342   0.333
  4500   66/34   0.354   0.340
  4000   70/30   0.369   0.350
  3500   77/23   0.389   0.362
  3100   79/21   0.418   0.380
表2.针对驱动电流的选定比率IA/IB和色温CCT(K)的色度坐标CIE(x，y)，其中IA是桔黄LED驱动电流，且IB是蓝-绿LED驱动电流。
在另一实施例中，第一LED布置包括绿-黄磷光体7，其由辐射具有从440nm到470nm的波长范围的蓝光的LED 9激活，且第二LED布置包括发射具有从620nm到640nm的波长范围的红光的LED。在此布置中，将了解，不需要磷光体区8。
图6展示用于操作图1的光源的另一驱动器电路60。驱动器电路60包括用于操作每一LED布置2、3的相应双极接面晶体管BJT1、BJT2(61、62)，以及包括电阻器R1到R6(分别表示为63到68)的偏置网络，用于设定晶体管61、62的dc操作条件。将晶体管61、62配置为发射极e接地配置中的电子开关。第一和第二LED布置串联连接在电源VCC与其相应的晶体管的集极端子c之间。可变电阻器RW 7连接在所述晶体管的基极端子b之间，且用于设定第一和第二LED布置2、3的相对驱动电流IA和IB(其中BJT1的IA＝Ice，且BJT2的IB＝Ice)，且因此通过设定晶体管的基极处的相对电压Vb1和Vb2来设定源的色温。控制电压Vb1和Vb2由以下关系给出：
Figure GSB00000569469500071
且
Figure GSB00000569469500072
作为用dc驱动电流IA、IB来驱动LED布置且设定驱动电流的相对量值来设定色彩的替代方案，可用经脉冲宽度调制(PWM)的驱动电流iA、iB来动态地驱动LED布置。图7说明可操作以在PWM驱动电流的相反相位(即
Figure GSB00000569469500073
)上驱动两个LED布置2、3的PWM驱动器电路70。PWM驱动电流的工作周期是输出为高的完整周期(时间周期T)的比例(标记时间Tm)，且确定第一LED布置在所述时间周期内可操作多长时间。相反，输出为低的完整时间周期的时间比例(空间时间Ts)确定第二LED布置可操作的时间长度。动态地驱动LED布置的优点是所述LED布置每一者以最佳驱动电流操作，但所述时间周期需要经选择以防止光输出的闪烁，且确保两个LED布置所发射的光在观察者观看时组合以给出在色彩上看起来为白色的光。
驱动器电路70包括计时器电路71(例如NE555)，其在非稳态(自由运行)的操作中配置，所述操作的工作周期由分压器布置设定，所述分压器布置包括电阻器R1、RW、R2和电容器C1以及低压单极/双掷(SPDT)模拟开关72，例如Fairchild SemiconductorTM FSA3157。计时器73的输出(其包括PWM驱动电压)用于控制SPDT模拟开关72的操作。电流源74连接到所述开关的极A，且LED布置2、3连接在开关的相应输出B0 B1与接地之间。一般来说，标记时间Tm大于空间时间Ts，且因此工作周期小于50％，且由以下等式给出：
Figure GSB00000569469500081
其中Tm＝0.7(RC+RD)C1、Ts＝0.7RC C1且T＝0.7(RC+2RD)C1。
为了获得小于50％的工作周期，可与电阻RD并联添加信号二极管D1，以在计时器周期的充电(标记)部分期间旁通RD。在此配置中，标记时间仅取决于RC和C1(Tm＝0.7RC C1)，使得工作周期被给出为：
Figure GSB00000569469500082
所属领域的技术人员将了解，可在不脱离本发明的范围的情况下，对所揭示的光源进行修改。举例来说，虽然在示范性实施方案中，将每一LED布置描述为包括提供为在相应LED裸片远端的相应区域的磷光体，但在其它实施例中，如图8中所示，设想使用一个LED 80用激励能量81来照射两个不同的磷光体7、8。在此布置中，无法通过控制LED的驱动电流来控制源的色温，且提供相应的光控制器82、83以控制来自每一LED布置的相对光输出。在一个实施方案中，光控制器82、83包括相应的LCD遮光器，且可使用被描述用以控制遮光器的驱动电压的驱动器电路来控制LCD遮光器。此外，将LCD遮光器有利地制造为阵列，且将磷光体提供为所述阵列的LCD遮光器的相应一者的表面上且上伏于所述相应一者上的相应区。
本发明的色温可调谐白光光源特别适用于商业和家庭照明应用的照明布置。由于色温是可调谐的，因此本发明的白光源在用于街道照明或车头灯中时特别有利。如所已知，具有较低色温的白光比具有相对较暖色温的白光更好地穿透雾。在此些应用中，提供传感器以检测雾、湿气的存在且/或测量其密度，且作为响应而调谐色温以优化雾的穿透。

Claims (14)

1.一种色温可调谐白光光源，其包括：第一LED布置，其可操作以发射第一颜色的光；以及第二LED布置，其可操作以发射第二颜色的光，其中，所述源的光输出在色彩上看起来为白色，且包括来自第一LED布置和第二LED布置的光的组合，所述第一LED布置包括远离至少一个第一LED的磷光体，所述至少一个第一LED与所述磷光体相关联，且可操作以产生第一波长范围的激励光，且照射发射不同波长范围的光的磷光体，其中所述第一LED布置所发射的光包括来自所述至少一个第一LED的通过所述磷光体的光以及从所述磷光体发射的光的组合，以及其中所述第二LED布置包括至少一个第二LED，其中所述磷光体可由所述至少一个第一LED而非所述至少一个第二LED激励；以及控制电路，其可操作以产生用于操作所述至少一个第一LED和所述至少一个第二LED的功率，且其中所述源所输出的光的色温可根据供应给所述至少一个第一LED和所述至少一个第二LED的功率来选择。
2.根据权利要求1所述的光源，其中所述第二LED布置包括远离且和至少一个第二LED相关联的相应第二磷光体，其中所述至少一个第二LED可操作以产生第二波长范围的激励光，且照射所述第二磷光体，使得其发射不同波长范围的光，其中所述第二LED布置所发射的光包括来自所述至少一个第二LED的通过所述第二磷光体的光以及从所述第二磷光体发射的光的组合。
3.根据权利要求1所述的光源，其中所述控制电路可操作以通过控制供应至所述至少一个第一LED和所述至少一个第二LED的功率的比例来选择光的输出色温。
4.根据权利要求1所述的光源，其中所述控制电路可操作以通过控制所述至少一个第一LED和所述至少一个第二LED的驱动电流(IA、IB)的相对量值和/或驱动电压来选择光的输出色温。
5.根据权利要求1所述的光源，其中所述控制电路可操作以动态地切换所述至少一个第一LED和所述至少一个第二LED的驱动功率，且其中所述色温可通过控制所述驱动功率的工作周期来调谐。
6.根据权利要求5所述的光源，其中所述控制电路包括用于操作所述至少一个第一LED和所述至少一个第二LED的脉冲宽度调制驱动功率。
7.根据权利要求6所述的光源，其中所述至少一个第一LED和所述至少一个第二LED可在所述脉冲宽度调制驱动功率的相反相位上操作。
8.根据权利要求1所述的光源，其中所述第一LED布置包括多个第一LED，以及/或所述第二LED布置包括多个第二LED。
9.根据权利要求1所述的光源，其中所述磷光体发射绿光，且所述第二LED布置发射红光。
10.根据权利要求1所述的光源，其中所述磷光体发射黄光，且所述第二LED布置发射红光。
11.根据权利要求1所述的光源，其中所述第一LED布置所发射的光包括色温在2500K到4000K的范围内的暖白光，且其中所述第二LED布置所发射的光包括色温在6000K到10,000K的范围内的冷白光。
12.根据权利要求1所述的光源，其包括多个第一LED布置和/或多个第二LED布置，每个第一LED布置或第二LED布置可操作以发射第一颜色或第二颜色的光。
13.根据权利要求1所述的光源，其中所述第一LED布置和所述第二LED布置经配置以使他们的光发射之间相互独立。
14.根据权利要求1所述的光源，其中所述第一LED布置所发射的光是具有第一色温范围的白光，且所述第二LED布置所发射的光是具有第二色温范围的白光。
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US20080252197A1 (en) 2008-10-16
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