Abstract: In an embodiment a device comprises an output port configured to output an output voltage and an output current, a measurement module configured to measure the output current, and a controller configured to set an output voltage at a first level, receive a first measured output current, set an output voltage at a second level receive a second measured output current, compare the first measured output current and the second measured output current, increase the output voltage if the second measured output current is less than the first measured output current, and decrease the output voltage if the second measured output current is the same as or greater than the first measured output current.

Abstract: In an embodiment a device comprises an output port configured to output an output voltage and an output current, a measurement module configured to measure the output current, and a controller configured to set an output voltage at a first level, receive a first measured output current, set an output voltage at a second level receive a second measured output current, compare the first measured output current and the second measured output current, increase the output voltage if the second measured output current is less than the first measured output current, and decrease the output voltage if the second measured output current is the same as or greater than the first measured output current.

Abstract: It is inter alia disclosed to an apparatus (100), comprising at least one receiving coil (110) configured to receive electromagnetic energy from a wireless signal provided by a wireless charger, an interface (140) connected to the at least one receiving coil (110) and configured to be connected to a rechargeable energy source for charging the rechargeable energy source with energy received at the at least one receiving coil (110), an analyser (120) configured to measure at least one parameter being indicative of a property of the wireless signal provided by the wireless charger and configured to control the charging of a rechargeable energy source connected to the interface (140) based on the at least one measured parameter.