Power supply system

• US 9,893,566 B2
• Filed: 09/22/2014
• Issued: 02/13/2018
• Est. Priority Date: 06/30/2011
• Status: Active Grant

• Current Assignee: Yazaki Corporation
• Original Assignee: Yazaki Corporation
• Inventors: Ookawa, Masamitsu, Tanaka, Shingo, Taguchi, Noritaka
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Evans, James
• Application Number:
  US14/492,770
• Publication Number:
  US 20150048689A1
• Time in Patent Office: 1,240 Days
• Field of Search: 307104
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 3/003 relating to inverters
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

Provided is a power supply system which can reduce a decrease in transmission efficiency caused by displacement of a power supply side coil with respect to a power reception side coil and which can supply power from a power supply unit to a power reception unit with high efficiency. A power supply part includes a power supply side helical coil (33) to which power is supplied. A power reception part includes a power reception side helical coil (51) which electromagnetically-resonates with the power supply side helical coil (33) and receives power from the power supply side helical coil (33). Impedances of the power supply part and the power reception part are matched at position where center axes (Z1, Z2) of the power supply side helical coil (33) and the power reception side helical coil (51) are displaced with respect to each other.

Claims

1. A power supply system comprising:

a power supply unit including a power supply side coil to which electric power is supplied; and

a power reception unit including a power reception side coil arranged to electromagnetically resonate with the power supply side coil and receive the electric power from the power supply side coil,

wherein impedances of the power supply unit and the power reception unit are matched at a position where a center axis of the power supply side coil is displaced with respect to a center axis of the power reception side coil,

wherein impedances of the power supply unit and the power reception unit are not matched at a position where the center axis of the power supply side coil is coincident with the center axis of the power reception side coil, and

wherein the impedances of the power supply unit and the power reception unit are matched when the displacement of the center axes of the power supply side coil and the power reception side coil is within a range of 0.0625D to 0.375D, where D is a diameter of the power supply side coil and the power reception side coil.

2. The power supply system according to claim 1, wherein the power supply side coil and the power reception side coil are wound into a circular shape.