Patent ID: 9018851
Filing Date: 2015-04-28
Classification: H05B,Y02B

Abstract:
1. A light emitting diode (LED) lighting system comprising: a switching power converter having an input for coupling to an alternating current (AC) power source, an output having a link voltage, and a switch; an LED lighting subsystem coupled to receive power from the output of the switching power converter, the LED lighting subsystem including a current source for one or more LEDs, wherein the current source has a control node that determines an LED current through the one or more LEDs; a sense node in the LED lighting subsystem indicative of whether the link voltage is sufficient to maintain a selected LED current; and a switch state controller coupled to the switching power converter and coupled to the LED lighting subsystem, wherein the switch state controller controls switching of the switch and varies a control current provided to the control node of the current source based on at least a parameter sensed from the sense node.