Invention Grant
- Patent Title: Mixed load current compensation for LED lighting
- Patent Title (中): 混合负载电流补偿LED照明
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Application No.: US13774914Application Date: 2013-02-22
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Publication No.: US09167662B2Publication Date: 2015-10-20
- Inventor: Eric J. King , John L. Melanson , Daniel J. Baker , Mohit Sood , Rahul Singh
- Applicant: Cirrus Logic, Inc.
- Applicant Address: US TX Austin
- Assignee: Cirrus Logic, Inc.
- Current Assignee: Cirrus Logic, Inc.
- Current Assignee Address: US TX Austin
- Agency: Terrile, Cannatti, Chambers & Holland, LLP
- Agent Kent B. Chambers
- Main IPC: H05B37/02
- IPC: H05B37/02 ; H05B33/08

Abstract:
In at least one embodiment, a system and method provide current compensation in a lighting system by controlling a lamp current to prevent a current through a triac-based dimmer from undershooting a holding current value. In at least one embodiment, at least one of the lamps includes a controller that controls circuitry in the lamp to draw more lamp current for a period of time than needed to illuminate a brightness of the lamp at a level corresponding to particular phase-cut angle of the supply voltage. By drawing more current than needed, the controller increases the dimmer current during the period of time to prevent the dimmer current from falling below the holding current value. In at least one embodiment, the period of time corresponds to a compensating pulse of the lamp current at a time when the dimmer current would otherwise fall below the holding current value.
Public/Granted literature
- US20130221871A1 MIXED LOAD CURRENT COMPENSATION FOR LED LIGHTING Public/Granted day:2013-08-29
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