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1. 发明授权

US07342577B2 Light emitting diode driving apparatus with high power and wide dimming range 有权
标题翻译：发光二极管驱动装置，功率大，调光范围宽
公开(公告)号：US07342577B2
公开(公告)日：2008-03-11
申请号：US11043226
申请日：2005-01-25
申请人： Mark A. Struebel , Eric D. Ronning , Dennis M. Davey
发明人： Mark A. Struebel , Eric D. Ronning , Dennis M. Davey
IPC分类号： G09G5/00 , G09G3/36
CPC分类号： H05B33/0815 , G09G3/3406 , G09G2320/0633 , G09G2360/144 , H05B33/0851 , Y02B20/346
摘要： Apparatus are provided for driving an LED light source and controlling a light output of the light source over a wide luminance range in response to a luminance input. The apparatus includes: a voltage source having an output configured to couple with the light source, a first input configured to receive the luminance input, and a second input; a photodetector unit configured to logarithmically compress the luminance range and determine a voltage based on a luminance of the light source in the compressed range; a comparator having an input coupled to the photodetector unit and having an output; and, a signal converter having an input coupled to the output of the comparator and having an output coupled to the second input of the voltage source. The voltage source is configured to generate an output signal at the output of the voltage source. The output signal has a frequency and a pulse width based on the luminance input. The comparator is configured to determine an error signal based on a comparison of the luminance input with the voltage. The converter is configured to exponentially convert the error signal to the frequency.
摘要翻译：提供了用于驱动LED光源并且响应于亮度输入在宽的亮度范围内控制光源的光输出的装置。该装置包括：具有配置成与光源耦合的输出的电压源，被配置为接收亮度输入的第一输入和第二输入; 光电检测器单元，被配置为对数压缩所述亮度范围，并且基于所述光源在所述压缩范围内的亮度来确定电压; 比较器，其具有耦合到所述光电检测器单元并具有输出的输入; 以及信号转换器，其具有耦合到所述比较器的输出并具有耦合到所述电压源的所述第二输入的输出的输入。电压源被配置为在电压源的输出处产生输出信号。输出信号具有基于亮度输入的频率和脉冲宽度。比较器被配置为基于亮度输入与电压的比较来确定误差信号。转换器被配置为将误差信号指数地转换为频率。

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