Invention Grant
- Patent Title: Digital driver apparatus, method and system for solid state lighting
- Patent Title (中): 数字驱动装置,固态照明方法和系统
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Application No.: US11859680Application Date: 2007-09-21
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Publication No.: US07880400B2Publication Date: 2011-02-01
- Inventor: Dongsheng Zhou , Anatoly Shteynberg , Harry Rodriguez , Mark Eason , Lanh Nguyen
- Applicant: Dongsheng Zhou , Anatoly Shteynberg , Harry Rodriguez , Mark Eason , Lanh Nguyen
- Applicant Address: US CA Santa Clara
- Assignee: Exclara, Inc.
- Current Assignee: Exclara, Inc.
- Current Assignee Address: US CA Santa Clara
- Agency: Gamburd Law Group LLC
- Agent Nancy R. Gamburd
- Main IPC: H05B41/16
- IPC: H05B41/16 ; G09G3/36

Abstract:
An apparatus, method and system are provided for controlling the solid state lighting, such as LEDs. An exemplary apparatus comprises: a switch for switching electrical current through the LEDs, a current sensor; a first comparator adapted to determine when a switch electrical current has reached a first predetermined threshold; a second comparator adapted to determine when the switch electrical current has reached a predetermined average current level; and a controller. The controller is adapted to turn the switch into an on state and an off state, to determine a first on time period as a duration between either a detection of a second predetermined current threshold or the turning the switch into the on state, and the detection of the predetermined average current level; to determine a second on time period as a duration between the detection of the predetermined average current level and the detection of the first predetermined current threshold; and to determine an on time period of the switch as substantially proportional to a sum of the first on time period and the second on time period. Additional exemplary embodiments utilize a difference between the first and second on time periods to generate an error signal to adjust the on time period of the switch.
Public/Granted literature
- US20090079355A1 Digital Driver Apparatus, Method and System for Solid State Lighting Public/Granted day:2009-03-26
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