| 摘要 |
The disclosure relates to circuits for driving a plurality of electrical loads and to methods for operating such circuits, where each electrical load is driven according to a desired current. Exemplary embodiments include a circuit (100) comprising a switch mode converter (101) comprising a transformer (102) with primary and secondary windings, the primary winding (103) connected to a voltage supply (104) via one or more input control switches (105a, 105b); a plurality of output circuits (106a-c), each output circuit comprising a switch (107a-c) connecting one of the plurality of electrical loads (108a-c) to an output (109a-c) of the secondary winding (110), each electrical load (108a-c) connected in series with a respective switch (107a-c) and in parallel with a capacitor (112a-c); and a switching control circuit (113) connected for control of each of the output circuit switches (107a-c) and for sensing of a current through each of the electrical loads (108a-c), wherein the switching control circuit (113) is configured to operate the output circuit switches (107a-c) to maintain a set current through each of the electrical loads (108a-c), the switching control circuit (113) configured in successive output cycles of the switch mode converter (101) to operate each of the output circuit switches (107a-c) in an order dependent on a forward voltage of each of the respective electrical loads (108a-c). |
