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Invention Grant
US08237379B2 Circuits and methods for powering light sources 有权
为光源供电的电路和方法

  • Patent Title: Circuits and methods for powering light sources
  • Patent Title (中): 为光源供电的电路和方法
  • Application No.: US13228241
    Application Date: 2011-09-08
  • Publication No.: US08237379B2
    Publication Date: 2012-08-07
  • Inventor: Da Liu
  • Applicant: Da Liu
  • Applicant Address: US CA Santa Clara
  • Assignee: O2Micro, Inc.
  • Current Assignee: O2Micro, Inc.
  • Current Assignee Address: US CA Santa Clara
  • Main IPC: H05B37/02
  • IPC: H05B37/02
Circuits and methods for powering light sources
Abstract:
A controller for regulating a current through a light-emitting diode (LED) light source includes a first reference pin for receiving a first reference signal indicative of a target average level, and a dimming control pin for receiving a dimming signal. The controller regulates an average level of the current to the target average level. The current is regulated according to the first reference signal and a ramp signal if the dimming signal has a first level. The ramp signal is synchronized with the dimming signal. The current is cut off if the dimming signal has a second level.
Abstract(Chinese):

用于调节通过发光二极管（LED）光源的电流的控制器包括用于接收指示目标平均电平的第一参考信号的第一参考引脚和用于接收调光信号的调光控制引脚。 控制器将当前平均水平调节至目标平均水平。 如果调光信号具有第一电平，则根据第一参考信号和斜坡信号调节电流。 斜坡信号与调光信号同步。 如果调光信号具有第二电平，则电流被切断。

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