Power receiving device and power transmitting device

• US 10,141,784 B2
• Filed: 03/09/2016
• Issued: 11/27/2018
• Est. Priority Date: 03/11/2015
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Yuasa, Hiroaki
• Primary Examiner(s): Tra, Quan
• Application Number:
  US15/065,558
• Publication Number:
  US 20160268847A1
• Time in Patent Office: 993 Days
• Field of Search: 307104
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/366 made of ferromagnetic material
• CPC Class Codes: H01F 27/40 Structural association with built-in electric component, e.g. fuse
• CPC Class Codes: H01F 3/10 Composite arrangements of magnetic circuits
• 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 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• 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 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A power receiving device includes: a ferrite member including a plurality of pieces of ferrite at least some of which are spaced from adjacent pieces of ferrite; a power receiving coil disposed on a lower surface side of the ferrite member; and a power receiving capacitor disposed on an upper surface side of the ferrite member. The power receiving capacitor has a closed loop circuit including first and second wiring connections and a plurality of capacitor elements connected in parallel between the first wiring connection and the second wiring connection. When the power receiving capacitor and the ferrite member are viewed from the lower surface side of the ferrite member, the closed loop circuit is located behind and within a perimeter of one of the pieces of ferrite. A power transmitting device has a mirror structure to the power receiving device.

Claims

1. A power receiving device comprising:

a ferrite member including a plurality of pieces of ferrite, at least some of the pieces of ferrite being spaced from adjacent pieces of ferrite;

a power receiving coil disposed on a lower surface side of the ferrite member; and

a power receiving capacitor disposed on an upper surface side of the ferrite member,

the power receiving capacitor having a closed loop circuit including a first wiring connection, a second wiring connection, and a plurality of capacitor elements connected in parallel between the first wiring connection and the second wiring connection, wherein;

the ferrite member includes an outer looped ferrite and a center ferrite, the outer looped ferrite including a plurality of the pieces of ferrite disposed in a loop to form an opening and having a lower surface on which the power receiving coil is disposed, the center ferrite being disposed on the lower surface side of the outer looped ferrite and covering the opening,

the center ferrite includes a plurality of contact pieces of ferrite and an inner ferrite, the plurality of contact pieces of ferrite disposed in a loop in contact with an edge of the opening of the outer looped ferrite, the inner ferrite disposed inwardly of the contact pieces of ferrite, and

when the power receiving capacitor and the ferrite member are viewed from the lower surface side of the ferrite member, the closed loop circuit is located behind and within a perimeter of one of the pieces of ferrite, the one of the pieces of ferrite being of the inner ferrite.

2. The power receiving device according to claim 1, wherein:

the inner ferrite includes a first piece of ferrite and a second piece of ferrite;

the power receiving capacitor includes another closed loop circuit connected to the closed loop circuit, and a wiring connecting the closed loop circuit and the other closed loop circuit together;

the other closed loop circuit includes a third wiring connection, a fourth wiring connection, and a plurality of capacitor elements connected in parallel between the third wiring connection and the fourth wiring connection; and

when the power receiving capacitor and the ferrite member are viewed from the lower surface side of the ferrite member, the closed loop circuit and the other closed loop circuit are located behind and within the perimeter of the first piece of ferrite and the second piece of ferrite, respectively.

3. The power receiving device according to claim 1, wherein:

the power receiving capacitor is disposed within a recess formed by the outer looped ferrite and the center ferrite.

4. A power transmitting device comprising:

a ferrite member including a plurality of pieces of ferrite, at least some of the pieces of ferrite being spaced from adjacent pieces of ferrite;

a power transmitting coil disposed on an upper surface side of the ferrite member; and

a power transmitting capacitor disposed on a lower surface side of the ferrite member;

the power transmitting capacitor having a closed loop circuit including a first wiring connection, a second wiring connection, and a plurality of capacitor elements connected in parallel between the first wiring connection and the second wiring connection, wherein;

the ferrite member includes an outer looped ferrite and a center ferrite, the outer looped ferrite including a plurality of the pieces of ferrite disposed in a loop to form an opening and having an upper surface on which the power transmitting coil is disposed, the center ferrite being disposed on the upper surface side of the outer looped ferrite and covering the opening,

the center ferrite includes a plurality of contact pieces of ferrite and an inner ferrite, the plurality of contact pieces of ferrite disposed in a loop in contact with an edge of the opening of the outer looped ferrite, the inner ferrite disposed inwardly of the contact pieces of ferrite, and

when the power transmitting capacitor and the ferrite member are viewed from the upper surface side of the ferrite member, the closed loop circuit is located behind and within a perimeter of one of the pieces of ferrite, the one of the pieces of ferrite being of the inner ferrite.

5. The power transmitting device according to claim 4, wherein:

the inner ferrite includes a first piece of ferrite and a second piece of ferrite;

the power transmitting capacitor includes another closed loop circuit connected to the closed loop circuit, and a wiring connecting the closed loop circuit and the other closed loop circuit together;

the other closed loop circuit includes a third wiring connection, a fourth wiring connection, and a plurality of capacitor elements connected in parallel between the third wiring connection and the fourth wiring connection; and

when the power transmitting capacitor and the ferrite member are viewed from the upper surface side of the ferrite member, the closed loop circuit and the other closed loop circuit are located behind and within the perimeter of the first piece of ferrite and the second piece of ferrite, respectively.

6. The power transmitting device according to claim 4, wherein:

the power transmitting capacitor is disposed within a recess formed by the outer looped ferrite and the center ferrite.