Abstract: The invention relates to a crash box (1) for a bumper arrangement (2) of a motor vehicle, having at least two closed hollow chambers (5, 6, 7) which are formed over their entire longitudinal extent from a bumper-side end (3) as far as a vehicle-side end (4) and which are in each case separated from one another by a partition (10, 11) running between an outer wall (8) and an inner wall (9) of the crash box (1). The invention is distinguished in that the partition (10, 11) is provided with a slot (13) at its vehicle-side end (4) in its half (12) directed toward the inner wall (9) of the crash box (1).

Abstract: A method and a system for determining an AC input voltage in an output side of an isolated switching power supply are disclosed. The invention detects a peak-to-peak voltage in the output side of the power supply at a point in a circuit topology of the output side where the peak-to-peak voltage correlates to the AC input voltage. The AC input voltage is determined from the detected peak-to-peak voltage.