Lighting control systems

摘要

A system for controlling solid state lighting including a source to supply any one of a range of AC or DC voltages to a plurality of light strings. The source includes a power factor correction circuit 14 for controlling the power factor to the system and a separate transformer for each light string. The current can pass through each LED string is independently limited by each corresponding LED driver circuit. The current through each LED string can be modified according to a feedback monitor system that measures parameters such as LED characteristics, forward current, temperature, and LED output intensity/color. Each LED string has an independent sensor that monitors the voltage across each switching device in the corresponding LED driver circuits and utilizes a control unit to control the voltages supplied by each corresponding transformer through control signals in response to the monitored switching device voltages.

主权项

1. A system for controlling solid state lighting comprising:
a power source to supply any one of a range of AC or DC voltages; a means for controlling a power factor to the system; one or more power transformers each connecting to one or more LED strings; a switching means for each string for limiting the currents that can pass through the LED string; a sensor, parallel to the switching means, monitoring only the voltage applied across the switching means; feedback means for controlling the power transformer; the feedback means varying the voltage supply in response to only the voltage monitored by the sensor across the switching means; the feedback means being arranged to cause the power transformers to increase or decrease the voltage according to a predetermined upper and lower voltage level to a particular LED string to correctly regulate the current through the LED string for constant current operation, and wherein the feedback means is arranged to modify how it controls the power source dependent on intensity of the LED string.