apparatus for a wireless power transfer system including a power transmitter and a power receiver and method of operating a wireless power transfer system including a power transmitter and a power receiver

摘要

apparatus for a wireless power transfer system including a power transmitter and a power receiver and method of operation of a wireless power transfer system including a power transmitter and a power receiver a power transfer system includes a power receiver (105) and a power transmitter (101) generating a wireless inductive power transfer signal to power the power receiver (105) during a power transfer phase. In an apparatus, often the power transmitter (101) comprises a first communication unit (305) communicating with a second entity communication unit using an electromagnetic communication signal. the entity may typically be the energy receiver (105). the apparatus comprises a reference processor (307) for measuring and storing a reference value of a communication signal characteristic and a measuring unit (309) which repeatedly during the power transfer phase determines a measured value of the characteristic. a comparator (311) compares the measured values to the reference value and an initiator (313) triggers an entity detection process if the comparison indicates that a measured value and the reference value do not meet a similarity criterion. The entity detection process detects a presence of another entity. 1/1