| 摘要 |
The present document relates to illumination systems, in particular to a method and system for controlling the degree of dimming of solid state lighting devices such as LED or OLED assemblies. A driver circuit is configured to drive a solid state lightening, referred to as SSL, device, subject to an input voltage derived from a mains voltage using a phase-cut dimmer. The driver circuit comprises a transistor operable in a first mode and in a second mode; wherein in the first mode, the transistor alternates between an on-state and an off-state at a commutation cycle rate; wherein in the second mode, the transistor is controlled so that it is traversed by a current at a continuously controllable level; and a power converter network configured to provide a switched-mode power converter in conjunction with the transistor when operated in the first mode; wherein the power converter generates a drive voltage for the SSL device from the input voltage. |
