Wireless Power Transfer

Abstract

The power transmitter 101 provides power to the power receiver 105 via an electromagnetic signal generated by an output resonant circuit, which comprises a transmitting coil 103 and at least one capacitor 303. A measuring device 307 measures a load parameter indicative of a load on the transmitting coil 103 during a time interval in which power transmission is inactive. A determiner 309 determines a maximum electromagnetic signal level of the electromagnetic signal during power transmission according to the load parameter. A driver 301 generates a drive signal for the output resonant circuit 103 to generate the electromagnetic signal. The driver 301 is configured to limit the drive signal such that the electromagnetic field signal does not exceed the maximum electromagnetic signal level during power transmission.

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