US 9,490,064 B2Granted

Wireless power transmission method

AssigneeHonda Motor Co., Ltd.

InventorsAtsushi Hirosawa, Tomoaki Nakagawa

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Abstract

A wireless power transmission method transmits power from a first resonance antenna to a second resonance antenna in a noncontact manner through resonance of a magnetic field. The first resonance antenna is a resonance antenna of a power transmitting device, the second resonance antenna is a resonance antenna of a power receiving device. The wireless power transmission method includes setting a first transmission efficiency between the first resonance antenna and the second resonance antenna by changing a frequency of supply power of the power transmitting device. Power transmitted from the first resonance antenna to the second resonance antenna is gradually increased. A resonance frequency is changed by changing an induction coefficient or electrostatic capacity of the second resonance antenna to change the transmission efficiency between the first and second resonance antenna to a second transmission efficiency smaller than the first transmission efficiency, thereby matching received power to required power.

Claims3

Dependent claims

A wireless power transmission method that transmits power from a first resonance antenna to a second resonance antenna in a noncontact manner through resonance of a magnetic field, the first resonance antenna being a resonance antenna of a power transmitting device, the second resonance antenna being a resonance antenna of a power receiving device, the wireless power transmission method comprising the steps of:

setting transmission efficiency between the first resonance antenna and the second resonance antenna as first transmission efficiency by changing a frequency of supply power of the power transmitting device;
gradually increasing power transmitted from the first resonance antenna to the second resonance antenna;
and
changing a resonance frequency by a change of at least one of an induction coefficient and electrostatic capacity of the second resonance antenna to change the transmission efficiency between the first resonance antenna and the second resonance antenna to second transmission efficiency smaller than the first transmission efficiency, thereby matching received power to required power of the power receiving device.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 14/131,214Filed 27 Jul 2012
Priority: JP 2011-16536828 Jul 2011
Published: US 2014/0145516 A129 May 2014
Granted: 8 Nov 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification22 codes

B60L 53/12
Characterised by the energy transfer between the charging station and the vehicle: inductive energy transfer
B60L 53/36
Means for automatic or assisted adjustment of the relative position of charging devices and vehicles: by positioning the vehicle
H01F 38/14
Adaptations of transformers or inductances for specific applications or functions: inductive couplings
H02J 7/933
Regulation of charging or discharging current or voltage: the cycle being controlled or terminated in response to electric parameters