Contactless feeding pad and contactless feeding device

• US 10,279,691 B2
• Filed: 04/04/2013
• Issued: 05/07/2019
• Est. Priority Date: 04/11/2012
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Obayashi, Kazuyoshi, Mazaki, Kouji, Takahashi, Eisuke, Tani, Keisuke
• Primary Examiner(s): Henze-Gongola, David V
• Application Number:
  US14/390,906
• Publication Number:
  US 20150061585A1
• Time in Patent Office: 2,224 Days
• Field of Search: 320108, 307104
• CPC Class Codes: B60L 53/124 Detection or removal of foreign bodies
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings
• CPC Class Codes: H01F 27/40 Structural association with built-in electric component, e.g. fuse
• 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 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• 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 contactless feeding pad includes a power-receiving side pad, a power-transmitting side pad, and an auxiliary pad. The power-transmitting side pad is different from the power-receiving side pad in size or shape and transmits electric power contactlessly to the power-receiving side pad while being situated oppositely to the power-receiving side pad. The auxiliary pad is installed between the power-transmitting side pad and the power-receiving side pad in close proximity to the power-transmitting side pad or the power-receiving side pad and forms a resonance circuit.

Claims

1. A contactless feeding pad, comprising:

a power-receiving side pad including a winding;

a power-transmitting side pad including a winding in geometric topology forming a pole, different from the winding of the power-receiving side pad in geometric topology forming a plurality of poles, and transmitting electric power contactlessly to the power-receiving side pad while being situated oppositely to the power-receiving side pad; and

an auxiliary pad installed between the power-transmitting side pad and the power-receiving side pad to be in contact with the power-transmitting side pad and in close proximity to the power-receiving side pad and forming a resonance circuit, the auxiliary pad including a winding substantially identical in geometric topology with the winding of the power-receiving side pad,

wherein the winding of the power-transmitting side pad in geometric topology is different from the winding of the auxiliary pad in geometric topology forming a plurality of poles, and

wherein a region surrounded by the winding of the power-transmitting side overlaps with a region surrounded by the winding of the auxiliary pad.

2. The contactless feeding pad according to claim 1, further comprising:

a positioning portion used to determine an installation position of the auxiliary pad.

3. The contactless feeding pad according to claim 1, wherein

the auxiliary pad has a capacitor with a variable capacity.

4. The contactless feeding pad according to claim 1, wherein

the power-transmitting side pad is installed outside of a vehicle;

the power-receiving side pad is mounted to the vehicle; and

electric power is contactlessly sent from the outside of the vehicle to the vehicle.

5. A contactless feeding device, comprising:

the contactless feeding pad according to claim 1;

a power-transmitting circuit connected to the power-transmitting side pad and applying a voltage to the power-transmitting side pad; and

a power-receiving circuit connected to the power-receiving side pad and converting a voltage from the power-receiving side pad to output a converted voltage,

the contactless feeding device being characterized in that;

the auxiliary pad has an information transmission portion that outputs information about the auxiliary pad; and

at least one of the power-transmitting circuit and the power-receiving circuit operates according to the information about the auxiliary pad outputted from the information transmission portion.

6. The contactless feeding device according to claim 5, wherein

the information transmission portion outputs information identifying the auxiliary pad;

and

the power-transmitting circuit adjusts a voltage to be applied to the power-transmitting side pad according to the information identifying the auxiliary pad outputted from the information transmission portion.

7. The contactless feeding device according to claim 5, wherein

the information transmission portion outputs information on a power loss in the auxiliary pad;

and

the power-transmitting circuit corrects a power loss in the contactless feeding pad according to the information on the power loss in the auxiliary pad outputted from the information transmission portion and determines presence or absence of foreign matter between the power-transmitting side pad and the power-receiving side pad on the basis of the corrected power loss.

8. The contact feeding device according to claim 5, wherein the power-transmitting side pad includes magnetic pole portions.

9. The contact feeding device according to claim 8, wherein a part of the magnetic pole portions, which respectively form a magnetic pole of the power-transmitting side pad, is placed inside a region enclosed by the winding of the auxiliary pad.

10. A contactless feeding device, comprising:

a plurality of the contactless feeding pads according to claim 1 having the power-transmitting side pads identical in size and shape;

a power-transmitting circuit applying a voltage to the power-transmitting side pads; and

a connection switching circuit connecting one of the power-transmitting side pads of the plurality of contactless feeding pads to the power-transmitting circuit.

11. The contactless feeding pad according to claim 1,

wherein the winding of the power-transmitting side pad faces to the winding of the power-receiving side pad in an upper-lower direction, and

wherein the winding of the auxiliary pad faces to the winding of the power-receiving side pad in the upper-lower direction.

12. The contactless feeding pad according to claim 1,

wherein the power-transmitting side pad includes a hole portion,

wherein the auxiliary pad includes a protrusion portion, and

wherein an installation position of the auxiliary pad is determined by fitting the protrusion portion into the hole portion.

13. A contactless feeding pad, comprising:

a power-receiving side pad including a winding;

a power-transmitting side pad including a winding in geometric topology forming a pole different from the winding of the power-receiving side pad in geometric topology forming a plurality of poles and transmitting electric power contactlessly to the power-receiving side pad while being situated oppositely to the power-receiving side pad; and

an auxiliary pad installed between the power-transmitting side pad and the power-receiving side pad to be in contact with the power-receiving side pad and in proximity to the power-transmitting side pad and forming a resonance circuit, the auxiliary pad including a winding substantially identical in geometric topology with the winding of the power-receiving side pad,

wherein the winding of the power-transmitting side pad in geometric topology is different from the winding of the auxiliary pad in geometric topology forming a plurality of poles, and

wherein a region surrounded by the winding of the power-transmitting side pad overlaps with a region surrounded by the winding of the auxiliary pad.

14. The contactless feeding pad according to claim 13,

wherein the power-receiving side pad includes a hole portion,

wherein the auxiliary pad includes a protrusion portion, and

wherein an installation position of the auxiliary pad is determined by fitting the protrusion portion into the hole portion.

15. A contactless feeding pad, comprising:

a power-receiving side pad including a winding;

a power-transmitting side pad including a winding in geometric topology forming a plurality of poles different from the winding of the power-receiving side pad in geometric topology forming a pole and transmitting electric power contactlessly to the power-receiving side pad while being situated oppositely to the power-receiving side pad; and

an auxiliary pad installed between the power-transmitting side pad and the power-receiving side pad to be in contact with the power-transmitting side pad and in close proximity to the power-receiving side pad and forming a resonance circuit, the auxiliary pad including a winding substantially identical in geometric topology with the winding of the power-receiving side pad,

wherein the winding of the power-transmitting side pad in geometric topology is different from the winding of the auxiliary pad in geometric topology forming a pole, and

wherein a region surrounded by the winding of the power-transmitting side overlaps with a region surrounded by the winding of the auxiliary pad.