Rohm Co., Ltd.

Sayako Hamaguchi

Naoki Inoue

Xun He

A controller controls an inverter. A signal level detection circuit generates a detection value Sthat corresponds to a voltage at a connection node that connects a series resonance capacitor and multiple transmission coils. The controller (i) drives the inverterwhile sequentially selecting the multiple transmission coils, and acquires the detection value Sfrom the signal level detection circuit. Furthermore, the controller (ii) determines a single transmission coil to be used for power supply, based on comparison results of the detection values Sacquired for each transmission coil.

Wireless power transmission apparatus and control method for the same

First, a power receiving apparatus RX is detected (S). Subsequently, a pre digital ping is sent according to a first method (S). Upon reception of an unique signal defined for the first method from the power receiving apparatus RX (YES in S), tentative judgment is made that the power receiving apparatus RX supports the first method, and the flow transits to a final judgment operation (S). When such an unique signal has not been received (NO in S), tentative judgment is made that the power receiving apparatus RX supports a second method, and the flow transits to a final judgment operation (S).

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Kyoto, Japan

Sayako Hamaguchi