POWER MANAGEMENT OF AN LED-BASED ILLUMINATION DEVICE

摘要

An LED based lighting system includes a controlled current power supply (CCPS) coupled to provide electrical power to an LED based light engine having a plurality of light emitting diodes electrically coupled in series. The LED based lighting system further includes a controlled voltage power supply (CVPS) electrically coupled to the CCPS. A difference between an output voltage on the output node of the CVPS and an input voltage at the input node of the CCPS is used to adjust the output voltage at the output node of the CVPS.

主权项

1. An LED based lighting system comprising:
an LED based light engine comprising a plurality of light emitting diodes electrically coupled in series; a controlled current power supply (CCPS) having an input node and an output node, wherein the LED based light engine is electrically coupled to the output node of the CCPS, wherein the CCPS is configured to receive electrical power on the input node of the CCPS and provide electrical power to the LED based light engine on the output node of the CCPS; and a controlled voltage power supply (CVPS) having an input node and an output node, wherein the input node of the CCPS is electrically coupled to the output node of the CVPS, the CVPS configured to receive electrical power on the input node of the CVPS and provide the electrical power to the CCPS on the output node of the CVPS, the CVPS configured to: receive an indication of a first voltage at the input node of the CCPS; determine a second voltage at the output node of the CVPS; determine a difference between the second voltage at the output node of the CVPS and the first voltage at the input node of the CCPS; and provide a third voltage at the output node of the CVPS based on the difference.