| 摘要 |
The invention relates to a method and a circuit arrangement for switching on an electric load, in particular a power supply. The load is fed from a voltage source supplying an input voltage (Uac), and an input capacitor (Cin) is connected to the input terminals of the load (107). According to the method, (a) when the input voltage (Uac) is switched on, the operation is in the inrush mode, where the input capacitor (Cin) begins to be charged by means of a charging current (Ic) supplied by a constant-current generator circuit (108), when the input voltage (Uac) has exceeded its minimum value, and (b) after the input capacitor (Cin) is charged, a transition to the continuous mode following the start-up occurs. To switch on the load safely by means of equipment as simple as possible, information about the charging of the input capacitor (Cin) is derived from a change caused in the constant-current generator circuit by a drop in the charging current. <IMAGE> |
