Patent ID: 8766557
Filing Date: 2014-07-01
Classification: H02M,H05B,Y02B

Abstract:
1. A solid state lighting control system that provide power factor correction, the system comprising: a current waveform shaper coupled to receive an AC power signal, the current waveform adjusts a peak current on the AC power signal; a bridge rectifier coupled to receive an adjusted AC power signal, the bridge rectifier converts the adjusted AC power signal to a DC power signal; an LED driver coupled to receive the DC power signal and to generate a regulated LED power signal, the LED driver is controlled to provide power factor correction on the regulated LED power signal; a control circuit coupled to the LED driver, the control circuit comprising at least one switching device that enables an current at a particular frequency to be applied to an LED array independent of the power signal received at the bridge rectifier; and an inner control loop within the LED driver that controls a duty cycle of a switching device; and an outer control loop that controls the regulated LED power signal using an error amplifier, wherein the LED driver measures a current level on the AC power signal and controls the regulated LED power signal such that the power signal and the regulated LED power signal are in phase.