| 摘要 |
<p>The present document relates to illumination systems. In particular, the present document relates to a method and system for providing power to and for driving solid state lighting devices such as LED or OLED assemblies. A power converter (410) configured to convert a varying input voltage at an input into an output voltage at an output is described. The power converter (410) is configured to supply the output voltage to a solid state lighting, referred to as SSL, device (440) in series with a current source (430). The power converter (410) comprises one or more capacitors (411, 412); a plurality of switches (421, 422), configured to couple the one or more capacitors (411, 412) with one another, with the input and/or with the output, according to a plurality of configurations; and a control unit (105); wherein the control unit (105) is configured to operate the power converter (410) in a plurality of operational modes; the plurality of operational modes provide a corresponding plurality of different conversion ratios between the input voltage and the output voltage, respectively; a first operational mode of the plurality of operational modes comprises a first phase, during which the one or more capacitors (411, 412) are arranged in a first configuration from the plurality of configurations, and a second phase, during which the one or more capacitors (411, 412) are arranged in a different second configuration from the plurality of configurations; the control unit (105) is configured to control the plurality of switches (421, 422) to alternate between the first phase and the second phase at a commutation cycle rate, thereby operating the power converter (410) in the first operational mode; and the control unit (105) is configured to set one of the plurality of operational modes based on the varying input voltage.</p> |
