| 摘要 |
The invention relates to a circuit arrangement (10) for operating at least one first LED strand (D101 to D156) and one second LED strand (D201 to D228) comprising at least one first load subgroup (100) and one second load subgroup (200) each having a bridging element (120, 220), wherein the bridging elements (120, 220) are controlled by a controller (20) according to a voltage difference between a first connection (102, 202) of the respective load subgroup (100, 200) and an auxiliary DC voltage source (22) and also according to a respective LED strand voltage. A longitudinal voltage compensation impedance (24) and voltage dividing device (26) control a current with a current value (Ireg), which is proportional to a voltage value (Urect) of the rectified alternating supply voltage (12) in a first state (SI), and is equal to a predetermined current limit value (Ilim) in a second state (SII), via the serially coupled load subgroups (100, 200). The control can be combined with a dimming interface for brightness control. |
