| 摘要 |
The invention relates to a switched-mode power supply (1) having a first switching stage (6) for generating a rectified intermediate voltage (Vc) from a primary AC voltage (Vp), having a memory element (7) for buffer storing the intermediate voltage (Vc) which is generated by the first switching stage (6), and having a second switching stage (8) for generating a secondary output voltage (Vs) from the buffer-stored intermediate voltage (Vc). The switched-mode power supply (1) has a control circuit (9) for activating and deactivating the first switching stage (6), wherein the control circuit (9) is designed to activate the first switching stage (6) for a subregion, which is determined by the control circuit (9), of a first half-wave (11) of the primary AC voltage (Vp) and to deactivate the first switching stage (6) for at least one subsequent half-wave (12, 13) of the primary AC voltage (Vp). The invention also relates to an operating method for operating a switched-mode power supply (1) of this kind. |
