Patent ID: 7843150

Claim:
A power regulator system comprising: at least one current regulator configured to maintain a substantially constant current flow through each of at least one series connected light emitting diode (LED) string; a power converter configured to generate an output voltage to provide power to the at least one current regulator and the at least one series connected LED string; and a voltage regulator configured to determine a voltage that provides power to the at least one current regulator and to adjust the output voltage to maintain a substantially constant output voltage based on the determined voltage to mitigate power loss due to excessive voltage provided to power the at least one current regulator, wherein the voltage regulator comprises a voltage monitor, a digital-to-analog converter (DAC), and an error amplifier, the voltage monitor being configured to one of increase and decrease a reference voltage by a predetermined increment, the DAC being configured to convert the reference voltage to an analog reference voltage, and the error amplifier being configured to compare the analog reference voltage with the output voltage and to output a command signal, the command signal is being configured as an error voltage for adjusting the output voltage of the power converter and wherein the output voltage is one of increased by a predetermined increment if the determined voltage of each of the at least one current regulator is below a minimum threshold and decreased by a predetermined increment if each determined voltage of each of the at least one current regulator is above a maximum threshold.