WIRELESS POWER SUPPLY SYSTEM AND POWER TRANSMISSION DEVICE FOR WIRELESS POWER SUPPLY SYSTEM

WIPO Patent Application WO/2024/084967

A1

A wireless power supply system (10) comprises a power reception device (90) and a power transmission device (20). The wireless power supply system (10) forms an electromagnetic resonance field between the power transmission device (20) and the power reception device (90) to perform wireless power supply and uses the electromagnetic resonance field to perform signal transmission by a resonance modulation. The power transmission device (20) comprises: a power transmission coil (30) that performs wireless power transmission by forming the electromagnetic resonance field; a power transmission circuit (40) having a power transmission resonance circuit (43); a resonance demodulation circuit that achieves a resonance demodulation corresponding to the resonance modulation; a current detection circuit (60) that detects the input current to the power transmission circuit; and a current adjustment circuit (70) that adjusts the input current. The power transmission device (20) detects, by the current detection circuit (60), a state of being unable to detect a signal using the resonance modulation by a power reception circuit (92). The current detection circuit (60) changes the input current using the current adjustment circuit (70) when being in the state of being unable to detect the signal.

SAKAMOTO NORIKAZU (JP)
HOSOTANI TATSUYA (JP)

PCT/JP2023/036142

April 25, 2024

October 04, 2023

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MURATA MANUFACTURING CO (JP)

H02J50/12; H02J50/80; H04B1/59; H04B5/48

JP2010246292A	2010-10-28
JP2016214024A	2016-12-15
JP2017528106A	2017-09-21
JP2022515975A	2022-02-24

KAEDE PATENT ATTORNEYS' OFFICE (JP)

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