公开(公告)号：US20110031888A1

公开(公告)日：2011-02-10

申请号：US12681631

申请日：2008-10-08

申请人： Mike Datta ,  Ihor A. Lys

发明人： Mike Datta ,  Ihor A. Lys

IPC分类号： H05B41/282

CPC分类号： F21K9/60 ,  H01L2224/48091 ,  H01L2224/48227 ,  H05B33/0818 ,  H05B33/0857 ,  Y02B20/347 ,  H01L2924/00014

摘要： A lighting apparatus (100) includes one or more first LEDs (202) for generating a first spectrum of radiation (503), and one or more second LEDs (204) for generating a second different spectrum radiation (505). The first and second LEDs are electrically connected in series between a first node (516A) and a second node (516B), between which a series current (550) flows with the application of an operating voltage (516) across the nodes. A controllable current path (518) is connected in parallel with one or both of the first and second LEDs so as to at least partially divert the series current, such that a first current (552) through the first LED(s) and a second current (554) through the second LED(s) are different. Such current diversion techniques may be employed to compensate for shifts in color or color temperature of generated light during thermal transients, due to different temperature-dependent current-to-flux relationships for different types of LEDs.

摘要翻译： 照明装置（100）包括用于产生第一辐射光谱（503）的一个或多个第一LED（202）和用于产生第二不同光谱辐射（505）的一个或多个第二LED（204）。 第一和第二LED串联电连接在第一节点（516A）和第二节点（516B）之间，串联电流（550）流过跨越节点的工作电压（516）流动。 可控电流路径（518）与第一和第二LED中的一个或两个并联连接，以至少部分地转移串联电流，使得通过第一LED的第一电流（552）和第二LED 通过第二LED的电流（554）是不同的。 由于不同类型的LED的不同的温度依赖的电流 - 通量关系，可以采用这种电流分流技术来补偿在热瞬态期间所产生的光的颜色或色温的变化。