# US 10,308,124 B2 · Power reception apparatus and power transmission apparatus

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- Number: US 10,308,124 B2
- Document ID: US10308124B2
- Status: Granted
- Kind: B2
- Application number: 15/531,176
- Filed: 2015-11-27
- Published: 2017-11-16
- Granted: 2019-06-04
- Earliest claimed: 2014-11-28
- Assignees: Toyota Jidosha Kabushiki Kaisha; Yazaki Corporation
- Applicants: Toyota Jidosha Kabushiki Kaisha; Yazaki Corporation
- Inventors: Hiroaki Yuasa; Nobuhiro Kibudera; Syuhei Ejima; Satoru Horiuchi; Kazuyoshi Kagami
- Web page: https://patentgrep.com/patent/US10308124B2

## CPC

- H01F 38/14: Inductive couplings
- B60L 53/122: Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
- H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10)
- H01F 27/361: {made of combinations of electrically conductive material and ferromagnetic material}
- H01M 10/46: Accumulators structurally combined with charging apparatus (circuits for charging H02J7/00)
- H02J 7/70: characterised by the mechanical construction
- H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields
- B60L 2210/10: DC to DC converters
- B60L 2210/30: AC to DC converters
- B60L 2210/40: DC to AC converters
- B60L 2270/147: electro magnetic [EMI]
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H02J 50/10: using inductive coupling
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 10/72: Electric energy management in electromobility
- Y02T 90/12: Electric charging stations
- Y02T 90/14: Plug-in electric vehicles
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A power reception apparatus to which power is transferred from a power transmission apparatus in a contactless manner includes: a ferrite provided in a plate shape and having a first principal face and a second principal face; an annular coil provided on the first principal face of the ferrite; and a shield provided on the second principal face of the ferrite, wherein an outer peripheral portion of the coil is placed on an inner side relative to an outer peripheral portion of the ferrite, such that part of the first principal face is exposed on an outer-peripheral-portion side of the ferrite, and an outer peripheral side of the shield includes a stepped portion provided at a position away from the second principal face of the ferrite, such that part of the second principal face is exposed on the outer-peripheral -portion side of the ferrite.

## Claims

### Claim 1

A power reception apparatus to which power is transferred from a power transmission apparatus in a contactless manner, the power reception apparatus comprising:
a ferrite provided in a plate shape, the ferrite having a first principal face and a second principal face;
a coil provided on the first principal face of the ferrite, the coil having an annular shape; and
a shield provided on the second principal face of the ferrite, wherein:
an outer peripheral portion of the coil is placed on an inner side relative to an outer peripheral portion of the ferrite, such that part of the first principal face is exposed on an outer-peripheral-portion side of the ferrite; and
an outer peripheral side of the shield includes a stepped portion provided at a position away from the second principal face of the ferrite, such that part of the second principal face is exposed on the outer-peripheral-portion side of the ferrite.

### Claim 2 (depends on 1)

The power reception apparatus according to claim 1, wherein:
the stepped portion includes a vertical wall extending in a direction away from the second principal face of the ferrite; and
the outer peripheral portion of the coil is placed on an inner side relative to a position where the vertical wall is provided.

### Claim 3 (depends on 1)

The power reception apparatus according to claim 1, wherein:
the stepped portion includes a vertical wall extending in a direction away from the second principal face of the ferrite; and
a length of the vertical wall is not less than an exposure length of the ferrite from the vertical wall to the outer peripheral portion of the ferrite.

### Claim 4 (depends on 1)

The power reception apparatus according to claim 1, further comprising:
a housing configured to accommodate the ferrite, the coil, and the shield, the housing- being provided with a receptacle portion configured to accommodate a device placed on the side of the shield which is opposite to the ferrite, wherein
a length of a vertical wall is not more than an exposure length of the ferrite from the vertical wall to the outer peripheral portion of the ferrite.

### Claim 5 (depends on 1)

The power reception apparatus according to claim 1, wherein:
the ferrite is provided with a projection portion projecting toward a first-principal-face side;
the coil is disposed so as to surround an outer peripheral surface of the projection portion;
a gap where part of the first principal face of the ferrite is exposed is provided between the outer peripheral surface and an inner peripheral portion of the coil; and
a length of the gap is not less than a length of an exposed part of the first principal face on the outer-peripheral-portion side of the ferrite.

### Claim 6

A power transmission apparatus configured to transfer power to a power reception apparatus in a contactless manner, the power transmission apparatus comprising:
a ferrite provided in a plate shape, the ferrite having a first principal face and a second principal face;
a coil provided on the first principal face of the ferrite, the coil having an annular shape; and
a shield provided on the second principal face of the ferrite, wherein:
an outer peripheral portion of the coil is placed on an inner side relative to an outer peripheral portion of the ferrite, such that part of the first principal face is exposed on an outer-peripheral-portion side of the ferrite; and
an outer peripheral side of the shield includes a stepped portion provided at a position away from the second principal face of the ferrite, such that part of the second principal face is exposed on the outer-peripheral-portion side of the ferrite.

### Claim 7 (depends on 6)

The power transmission apparatus according to claim 6, wherein:
the stepped portion includes a vertical wall extending in a direction away from the second principal face of the ferrite; and
the outer peripheral portion of the coil is placed on an inner side relative to a position where the vertical wall is provided.

### Claim 8 (depends on 6)

The power transmission apparatus according to claim 6, wherein:
the stepped portion includes a vertical wall extending in a direction away from the second principal face of the ferrite; and
a length of the vertical wall is not less than an exposure length of the ferrite from the vertical wall to the outer peripheral portion of the ferrite.

### Claim 9 (depends on 6)

The power transmission apparatus according to claim 6, further comprising:
a housing configured to accommodate the ferrite, the coil, and the shield, the housing- being provided with a receptacle portion configured to accommodate a device placed on the side of the shield which is opposite to the ferrite, wherein
a length of a vertical wall is not more than an exposure length of the ferrite from the vertical wall to the outer peripheral portion of the ferrite.

### Claim 10 (depends on 6)

The power transmission apparatus according to claim 6, wherein:
the ferrite is provided with a projection portion projecting toward a first-principal-face side;
the coil is disposed so as to surround an outer peripheral surface of the projection portion;
a gap where part of the first principal face of the ferrite is exposed is provided between the outer peripheral surface and an inner peripheral portion of the coil; and
a length of the gap is not less than a length of an exposed part of the first principal face on the outer-peripheral-portion side of the ferrite.