| 摘要 |
A system for controlling solid state lighting comprises a source (1) to supply any one of a range of AC or DC voltages to a plurality of light strings (3, 4, 5). The source (1) includes a power factor correction circuit 14 for controlling the power factor to the system and a separate transformer (15, 16, 17) for each light string (3, 4, 5). The current that can pass through each LED string (3, 4 and 5) is independently limited by each corresponding LED driver circuit (6, 19 and 20). The current through each LED string (3, 4 and 5) can be modified according to a feedback monitor system (18, 21 and 22) that measures parameters such as LED characteristics, forward current, temperature, and LED output intensity/colour. Each LED string (3, 4 and 5) has an independent sensor (7, 23 and 24) that monitors the voltage across each switching device in the corresponding LED driver circuits (6, 19 and 20) and utilises a control unit (8, 25 and 26) to control the voltages supplied by each corresponding transformer (15, 16 and 17) through control signals (2, 27 and 28) in response to the monitored switching device voltages.
|
