| 摘要 |
A driver module for driving LEDs comprises: - a load path comprising a series connection of two or more LED strings each comprising at least one LED, wherein each LED string comprises a bypass module W1, W2, W3, W4 which is connected in parallel to the LED string and which is adapted to bypass the LED string, and a control unit CU adapted to activate one or more of the bypass modules in response to changes in the voltage across the load path, which is provided by a rectified alternating voltage such as an AC mains voltage. The control unit may be adapted to selectively activate the bypass modules with a frequency at least ten times higher than the frequency of the AC mains voltage, e.g. above 500Hz. |
