Patent ID: 7583035
Filing Date: 2009-09-01
Classification: G05F,H02M,H05B,Y02B

Abstract:
1. A system for driving one or plurality of LEDs, comprising: an energy source; a power converter for transferring electrical power from said energy source to LEDs in a form of a controlled output current and providing said LEDs brightness regulation, said power converter being constructed as a switching converter, including an inductor, a rectifier, a power switch, operating in a dual phase cycle, having an on phase, when said power switch is closed, exciting said inductor by an input voltage, and an off phase when said power switch is open; a peak current sensor through said power switch; a regulator, controlling said dual phase cycle at a variable frequency and a constant off time, coupled to said power converter and receiving feedback signals from at least one of an electrical, thermal or optical sensor for sensing said LEDs performance and comprising: an oscillator, coupled to said digital logic; and a buffer to drive said power switch.