Power supply arrangement and inductively coupled battery charger with wirelessly coupled control, and method for wirelessly controlling a power supply arrangement and an inductively coupled battery charger

摘要

A power supply arrangement comprises a primary side and a secondary side. There is a power transformer between the primary side and the secondary side. On the primary side certain switching means are arranged to repeatedly switch, at a certain frequency, an electric current coupled into the power transformer for cyclically transferring energy from the primary side to the secondary side at said certain frequency. A wireless feedback link exists between the primary side and the secondary side. On the secondary side there are feedback pulse generating means for generating feedback pulses at a certain frequency to be transferred from the secondary side to the primary side over the wireless feedback link. On the primary side there are means for utilizing the feedback pulses in controlling the rate at which energy is transferred from the primary side to the secondary side. The feedback pulse generating means are arranged to generate the feedback pulses at a frequency that is different from the frequency used by the switching means at the primary side to repeatedly switch an electric current coupled into the power transformer.