| 摘要 |
An illumination system (100)comprises: an LED system (120) comprising two or more LED groups (21, 22, 23, 24; 451, 452) and current distribution means (140), wherein each LED group includes one or more individual LEDs, the LED system (120) having two input terminals (121, 122); a single controllable driver (130) for providing working power to the LED system (120), the driver having two output terminals (131, 132) coupled to the two input terminals (121, 122) of the LED system (120), respectively; a control device (2) for controlling the driver (130); wherein the control device (2) is designed for controlling the driver output voltage (Vi); and wherein the current distribution means are responsive to the input voltage (Vi) at the input terminals of the LED system for drawing current from the driver and distributing the current among the different LED groups in dependence on the input voltage level. |
