Patent ID: 8247985
Filing Date: 2012-08-21
Classification: B60Q,F21K,F21S,F21V,F21Y,H01L,H05B,Y02B

Abstract:
1. An LED lighting unit for replacing a conventional fluorescent tube between the opposed electrical receptacles of a fluorescent lighting fixture, comprising: an elongate support structure having a first end and a second end opposite said first end; a first end cap disposed upon said first end of said elongate support structure; a second end cap disposed upon said second end of said elongate support structure; wherein each of said first end cap and said second end cap includes a fluorescent light fixture receptacle connector extending from each said end cap and configured for installing within the opposed electrical receptacles of the fluorescent lighting fixture; a plurality of LEDs disposed along said elongate support structure in an electrical circuit with one another; a cover overlying the elongate support structure and forming a housing enclosing the plurality of LEDs; a battery supplying power to the plurality of LEDs; a pulse-width modulating circuit receiving DC power from said battery and supplying modulated power to said plurality of LEDs; and one or more current-limiting circuits coupled between said pulse-width modulating circuit and said plurality of LEDs; wherein said one or more current-limiting circuits comprises an inductor electrically connected in series between said pulse-width modulating circuit and said plurality of LEDs and a power diode electrically connected between ground and a node between said pulse-width modulating circuit and said inductor.