Patent
Apparatus, Method and System for Providing AC Line Power to Lighting Devices
Anatoly Shteynberg,Dongsheng Zhou,Harry Rodriguez,Mark Eason,Bradley M. Lehman,Stephen F. Dreyer,Thomas J. Riordan +6 more
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TLDR
In this article, an apparatus, method, and system for providing AC line power to lighting devices such as light emitting diodes (LEDs) is described, which consists of a plurality of LEDs coupled in series to form an array of segments of LEDs.Abstract:
An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). A representative apparatus comprises: a plurality of LEDs coupled in series to form a plurality of segments of LEDs; first and second current regulators; a current sensor; and a controller to monitor a current level through a series LED current path, and to provide for first or second segments of LEDs to be in or out of the series LED current path at different current levels. A voltage regulator is also utilized to provide a voltage during a zero-crossing interval of the AC voltage. In a representative embodiment, first and second segments of LEDs are both in the series LED current path regulated at a lower current level compared to when only the first segment of LEDs is in the series LED current path.read more
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References
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Patent
System and method for driving LED
TL;DR: In this article, the average LED current is measured by integrating LED pulse current at off time and hysteretically adjusting on time of the power switch, and the regulator is constructed as a hysteretic peak current mode controller for continuous mode of operation of a power converter.
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TL;DR: In this paper, a method and a circuit for driving light emitting diodes (LEDs) in multiphase is provided, where a string of LEDs divided into groups connected to each other in series is provided.
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Light Emitting Device For Ac Power Operation
TL;DR: In this paper, an improved light-emitting device for an AC power operation is presented, which employs a variety of means by which light emission time is prolonged during a ½ cycle in response to a phase change of an AC Power source and a flicker effect can be reduced.