| 摘要 |
The invention relates to an input circuit (1) for an electrical device (2), comprising a common electrical path (18) having a first line filter (4), a first electrical path (6) that is connected in series to the common electrical path (18) and has a second line filter (8), and a second electrical path (7) that is connected in series to the common electrical path (18) and connected in parallel to the first electrical path (6). The input circuit comprises a first switching element (5) for opening the first electrical path (6). In a first operating mode (Z1) having a high power consumption of the electrical device (1), the first switching element (5) is closed, so that a filtration of an operating current is effected by way of the first line filter (4) and the second line filter (8), and in a second operating mode (Z2) having a reduced power consumption of the electrical device (2), the first switching element (5) is opened, so that a filtration is effected only by the first line filter (4). The invention further relates to the use of such an input circuit (1) in a switching power supply unit and to an electrical device (2) comprising such an input circuit (1). |
