1. A device for providing electrical power to at least one electronic circuit branch comprising at least one light source of an automotive vehicle, the device comprising:a converter circuit configured to convert a constant direct current (DC) input voltage VIN into a load voltage, which is applied to said at least one circuit branch;
control means configured to generate a periodic signal S having a frequency f and to provide the periodic signal S to the converter circuit;
detecting means connected to the input voltage VIN in parallel with the converter circuit and configured to detect a disruption in the input voltage VIN, and to determine a frequency fp of the disruption; and
adapting means configured to modify the frequency f of said periodic signal S according to the determined frequency fp of the disruption.