WIRELESS POWER TRANSMISSION DEVICE, SUPPLY POWER CONTROL METHOD FOR WIRELESS POWER TRANSMISSION DEVICE, AND METHOD FOR MANUFACTURING WIRELESS POWER TRANSMISSION DEVICE

• US 20150380949A1
• Filed: 10/10/2013
• Published: 12/31/2015
• Est. Priority Date: 02/12/2013
• Status: Abandoned Application

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: HATANAKA, Takezo, TSUDA, Hisashi
• Application Number:
  US14/767,016
• Publication Number:
  US 20150380949A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/00304 Overcurrent protection

Abstract

A wireless power transmission apparatus supplies power from a power-supplying module equipped with a power-supplying coil and a power-supplying resonator to a power-receiving module equipped with a power-receiving coil and a power-receiving resonator by changing magnetic field. In a supply power control method for the wireless power transmission device, the power is supplied with such a value that the driving frequency of the power supplied to the power-supplying module does not match with the resonance frequencies of the power-supplying module and the power-receiving module. The element values of circuit elements constituting the power-supplying module and the power-receiving module are used as parameters, and by changing each of the parameters, the input impedance (Z_in) of the wireless power transmission apparatus is set to adjust the power to be supplied.

Claims

1. A supply power control method for a wireless power transmission apparatus configured to supply power from a power-supplying module comprising at least one of a power-supplying coil and a power-supplying resonator to a power-receiving module comprising at least one of a power-receiving resonator and a power-receiving coil, while varying a magnetic field, wherein

the power is supplied with a value such that a driving frequency of the power supplied to the power-supplying module does not match with the resonance frequencies of the power-supplying module and the power-receiving module,

the power supplied is adjusted, by varying, as parameters, element values of a plurality of circuit elements constituting the power-supplying module and the power-receiving module, to set the input impedance (Z_in) of the wireless power transmission apparatus.

2. The supply power control method according to claim 1, for a wireless power transmission apparatus configured to supply power from a power-supplying module comprising at least a power-supplying coil and a power-supplying resonator to a power-receiving module comprising at least a power-receiving resonator and a power-receiving coil, by means of a resonance phenomenon, wherein

the power is supplied with a value such that a driving frequency of the power supplied to the power-supplying module does not match with the resonance frequencies of the power-supplying module and the power-receiving module, and

where a total impedance of a circuit element including a coil L₁ and constituting the power-supplying coil is Z₁,

a total impedance of a circuit element including a coil L₂ and constituting the power-supplying resonator is Z₂.

a total impedance of a circuit element including a coil L₃ and constituting the power-power-receiving resonator is Z₃.

a total impedance of a circuit element including a coil L₄ and constituting the power-receiving coil is Z₄,

a total load impedance of an electronic device receiving power from the power-receiving coil is Z₁,

a mutual inductance between the coil L₁ of the power-supplying coil and the coil L₂ of the power-supplying resonator is M₁₂,

a mutual inductance between the coil L₂ of the power-supplying resonator and the coil L₃ of the power-receiving resonator is M₂₃, and

a mutual inductance between the coil L₃ of the power-receiving resonator and the coil L₄ of the power-receiving coil is M₃₄,

the element values of the plurality of circuit elements constituting the power-supplying coil, the power-supplying resonator, the power-receiving coil, and the power-receiving resonator, and the mutual inductances are used as the parameters, and are varied to control the input impedance Z_in of the wireless power transmission apparatus, which is derived from the following Equation, thereby to adjust the supplied power.

3. The supply power control method according to claim 2 for a wireless power transmission apparatus, wherein the element values of a plurality of circuit elements constituting the power-supplying module and the power-receiving module and the mutual inductances are used as parameters, and the parameters are varied to set a value of transmission characteristic relative to a driving frequency of the power supplied to the power-supplying module, so that the characteristic has peaks in a lower drive frequency band and a higher drive frequency band than a resonance frequency.

4. The supply power control method according to claim 3, for a wireless power transmission apparatus, wherein the driving frequency of the power supplied to the power-supplying module is in a band corresponding to a peak value of the transmission characteristic occurring in a driving frequency band lower than the resonance frequency.

5. The supply power control method according to claim 3, for a wireless power transmission apparatus, wherein the driving frequency of the power supplied to the power-supplying module is in a band corresponding to a peak value of the transmission characteristic occurring in a driving frequency band higher than the resonance frequency.

6. A wireless power transmission apparatus adjusted by the supply power control method for a wireless power transmission apparatus according to claim 1.

7. A manufacturing method for a wireless power transmission apparatus configured to supply power from a power-supplying module comprising at least one of a power-supplying coil and a power-supplying resonator to a power-receiving module comprising at least one of a power-receiving resonator and a power-receiving coil in such a manner that the driving frequency of the power supplied does not match with a resonance frequency in the power-supplying module and the power-receiving module, while varying a magnetic field, the method comprising

a design process of adjusting power supplied by the wireless power transmission apparatus, by varying, as parameters, the element values of a plurality of circuit elements constituting the power-supplying module and the power-receiving module, to control the input impedance (Z_in) of the wireless power transmission apparatus.