A power transmitter for transferring power to a power receiver using a wireless inductive power signal includes a power source provides a power source signal which may have level variations. A power signal generator generates a drive signal from the power source signal by a frequency converter which increases the frequency of the drive signal relative to the power source signal. A limiter restricts the power of the drive signal fed to the inductor to be below a threshold in repeating time intervals. A synchronizer synchronizes the repeating time intervals to the power source signal. In the power receiver, an inductor receives a power signal from the power transmitter, a load coupler decouples the power load from the inductor during the repeating time intervals and a synchronizer synchronizes the repeating time intervals of the receiver to the power signal. Communication units exchange data during the repeating time intervals.