A method and an apparatus are used for power supply input connection. The apparatus according to one embodiment comprises a first switch module (143_1) connected to a first power supply input (Vin1); a first controller module (145_1) connected to the first power supply input (Vin1) and to a secondary power connection (Vc), wherein the first controller module (145_1) puts the first switch module (143_1) in a first operating state when a parameter relating to the first power supply input (Vin1) is larger than a parameter relating to the secondary power connection (Vc), and puts the first switch module (143_1) in a second operating state when the parameter relating to the first power supply input (Vin1) is smaller than the parameter relating to the secondary power connection (Vc); and a first driver module (160_1) connected to the first controller module (145_1) and to the first switch module (143_1), wherein the first driver module (160_1) modifies a parameter relating to a drive characteristic of the first switch module (143_1).