Abstract: A transmitter of a wireless power transfer system is provided. The transmitter comprises a processor and a memory. The memory stores executable instructions that, in response to execution by the processor, can cause the processor to receive one or more signals generated by an inverter of the transmitter. The processor can measure or obtain a first value of the one or more signals and perform a comparison between the first value and a second value of the one or more signals. Based on the comparison, the processor can adjust at least one parameter of a pulse width modulation (PWM) signal generated by the processor that controls the inverter to maintain the inverter in a soft switching state.

Abstract: The present disclosure relates to a wireless power transmission system (100) comprising a wireless power transmission device (108), and a method of identifying the presence of a foreign object within wireless power transmission range of the wireless power transmission device (108). The wireless power transmission system (100) comprises a wireless power transmission device (108) for wirelessly transmitting power to an electronic receiver device (102) and a digital subsystem comprising an analog to digital converter “ADC” and a processor. The ADC is configured to digitise a waveform associated with the wireless power transmission device (108), to produce a source-drain waveform vector. The processor is configured to apply a classifier to the source-drain waveform vector; and determine, based on a numerical output of the classifier, whether a foreign object is present within wireless power transmission range of the wireless power transmission device (108).