Led power supply systems and methods

摘要

One aspect of the present invention includes a light-emitting diode (LED) power supply system. The system includes an LED regulator configured to monitor at least one LED voltage associated with a respective at least one activated LED string and to generate an LED regulation voltage based on the at least one LED voltage relative to an LED power voltage that provides power to the at least one activated LED string. The system also includes a power converter configured to generate the LED power voltage and to regulate the LED power voltage based on the LED regulation voltage.

主权项

1. A light-emitting diode (LED) power supply system comprising:
an LED regulator configured to monitor at least one LED voltage associated with a respective at least one activated LED string and to generate an LED regulation voltage based on the at least one LED voltage relative to an LED power voltage that provides power to the at least one activated LED string; and a power converter configured to generate the LED power voltage and to regulate the LED power voltage based on the LED regulation voltage,wherein the power converter is configured to regulate the LED power voltage based on both the LED regulation voltage and a predetermined reference voltage and wherein the power converter is configured to regulate the LED power voltage based on a feedback voltage having a magnitude that is based on both the LED power voltage in a first feedback loop and the LED regulation voltage in a second feedback loop, the power converter regulating the LED power voltage based on the feedback voltage relative to the predetermined reference voltage, the first feedback loop comprising a resistor (RFB1) in series with a resistor (RFB2) between the LED power voltage and a reference, the second feedback loop comprising the two feedback resistors of the first loop and a third resistor (RFB3) according to the equation:
VLED=(RFB1+RFB2)/RFB2*VREF+RFB1/RFB3*(VREF−VLREG)in which VLED in the LED power voltage;
RFB1 and RFB2 are the feedback resistors of the first loop; RFB3 is the feedback resistor of the second loop; VLREG is the LED regulation voltage; and VREF is the predetermined reference voltage.