Input circuit for a switching power supply

Input circuit for a switching power supply having a voltage converter module for converting a mains voltage into the required low voltage for supplying a consumer with a low voltage, wherein an input (102, 104) of the input circuit (100) is connected to the mains voltage connected to rectify the mains voltage, and an output (106, 108) of the input circuit of the voltage transformer module is connected to provide a rectified input voltage to the voltage converter module, and wherein the input circuit comprises at least two controllable switches (T1, T2) working as a synchronous rectifier, and are connected such that they off by mutual positive control switched on and off, further wherein flowing to define a through the controllable switch (T1, T2) of electric current, and for providing a soft start a current control (110) is provided which is arranged the current-proportional voltage drop across a current sensing resistor (R1) to the output (108 ) of the input circuit and the two controllable switches is connected to compare (with a first reference voltage Ref1), and to regulate the current through proportional to heading off the controllable switch.