WO2014147985A1

WO2014147985A1 - Contactless charging device

Info

Publication number: WO2014147985A1
Application number: PCT/JP2014/001264
Authority: WO
Inventors: 剛西尾; 修大橋; 則明朝岡; 正剛小泉
Original assignee: パナソニック株式会社
Priority date: 2013-03-21
Filing date: 2014-03-07
Publication date: 2014-09-25
Also published as: JP2014183689A

Abstract

A contactless charging device that, while minimizing heat generation, can prevent a coil from falling out of a shield via an open section thereof. Said contactless charging device (100) is provided with the following: a solenoid coil that has a winding (12); and a shield member that blocks electromagnetic power generated by the solenoid coil. The solenoid coil uses said electromagnetic power to either provide electrical power in a direction perpendicular to the central axis of the winding (12) or receive electrical power from said direction. The shield member is provided within a space defined by the projection of the region containing the winding (12) onto the aforementioned perpendicular direction.

Description

Non-contact charger

This invention relates to the non-contact charging device provided with the shield which shields the unnecessary radiation from a coil.

As a technology for charging a storage battery mounted on a plug-in HEV (Hybrid Electric Vehicle) or EV (Electric Vehicle) from an external power source, for example, contactless charging using electromagnetic induction is known. ing. This non-contact charging is realized by a non-contact power transmission device including a power transmission coil and a non-contact power reception device including a power reception coil. In this specification, the non-contact power transmission device and the non-contact power reception device are collectively referred to as a non-contact charging device.

In the non-contact charging apparatus, unnecessary radiation generated from the power transmission coil or the power reception coil becomes a problem. Thus, for example, Patent Documents 1 and 2 disclose a technique of shielding unwanted radiation by surrounding a coil with a rectangular parallelepiped shield made of a material having an electromagnetic shielding effect. One of the bottom surfaces constituting the shield is open so that the coil can perform power transmission or reception with another coil facing the coil.

JP 2011-91999 A JP 2005-101392 A

However, in the techniques of Patent Documents 1 and 2, since one of the bottom surfaces constituting the shield is open, when the non-contact power receiving device including the shield is mounted on the vehicle, the power receiving coil starts from the opening facing downward. May fall off.

Therefore, it can be considered that a reinforcing member (for example, a part of the shield) is provided in a part of the opening part to cope with the falling of the coil from the opening part. However, depending on the position where the reinforcing member is disposed, there is a problem that the magnetic flux from the coil generates heat due to the linkage with the reinforcing member.

An object of the present invention is to provide a non-contact charging apparatus that can prevent a coil from falling off from an opening portion of a shield while suppressing heat generation.

A contactless charging apparatus according to an aspect of the present invention includes a solenoid coil having a winding and a shield member that shields electromagnetic force generated from the solenoid coil, and the solenoid coil uses the electromagnetic force to Power is supplied in a direction perpendicular to the central axis of the winding, or power is received from the vertical direction using electromagnetic force, and the shield member is in a space in which a region with the winding is projected in the vertical direction. Take the configuration provided.

The present invention can prevent the coil from falling from the opening of the shield while suppressing heat generation.

The perspective view which shows an example of the non-contact charging device which concerns on Embodiment 1 of this invention The side view which shows the example at the time of charge execution of the non-contact charging device which concerns on Embodiment 1 of this invention Sectional drawing which shows the structural example of the longitudinal direction of the non-contact charging device which concerns on Embodiment 1 of this invention The side view which shows an example of vehicle mounting of the non-contact charging device which concerns on Embodiment 1 of this invention The perspective view which shows an example of the non-contact charging device which concerns on Embodiment 2 of this invention Sectional drawing which shows the structural example of the longitudinal direction of the non-contact charging device which concerns on Embodiment 2 of this invention The perspective view which shows an example of the non-contact charging device which concerns on Embodiment 3 of this invention Sectional drawing which shows the structural example of the longitudinal direction of the non-contact charging device which concerns on Embodiment 3 of this invention The perspective view which shows an example of the non-contact charging device which concerns on Embodiment 4 of this invention

(Embodiment 1)
A non-contact charging apparatus according to Embodiment 1 of the present invention will be described.

First, the overall configuration of contactless charging apparatus 100 according to the present embodiment will be described with reference to FIG. FIG. 1 is a perspective view of contactless charging apparatus 100 according to the present embodiment.

The non-contact charging device 100 is, for example, a power transmission device or a power receiving device used for non-contact charging of an EV or a plug-in HEV. In FIG. 1, the non-contact charging device 100 has a solenoid coil and a shield.

The solenoid coil functions as a power transmission coil that generates a magnetic flux F (not shown; see, for example, FIG. 2, FIG. 5A, etc.) that fluctuates due to electromagnetic induction. Alternatively, the solenoid coil functions as a power receiving coil that receives the magnetic flux F. As shown in FIG. 1, the solenoid coil has a core 11 (an example of a core member) and a winding 12. The core 11 is, for example, a rectangular parallelepiped ferrite. The winding 12 is provided at a central portion in the longitudinal direction of the core 11. When the solenoid coil is a power transmission coil, the winding 12 is driven by an alternating current and generates a magnetic flux F. On the other hand, when the solenoid coil is a power receiving coil, the winding 12 receives the magnetic flux F and generates an alternating current.

Magnetic flux F is generated at both ends of the core 11 around which the winding 12 is wound, and is transmitted and received by magnetic coupling with other solenoid coils, and also generated at the other end of the solenoid coil itself. That is, the solenoid coil supplies power in a direction perpendicular to the central axis of the winding 12 (hereinafter referred to as “vertical direction”) using electromagnetic force, or receives power from the vertical direction using electromagnetic force. .

In FIG. 1, the arrow Y indicates the central axis of the winding 12. An arrow Z indicates a direction perpendicular to the arrow Y. That is, the arrow Z indicates the “vertical direction”. An arrow X indicates a direction perpendicular to the arrow Y and perpendicular to the arrow Z. Note that the directions indicated by the arrows X, Y, and Z are similarly applied to FIGS.

FIG. 2 shows an example when the power transmission device 100a with the contactless charging device 100 as the power transmission side and the power reception device 100b with the contactless charging device 100 as the power reception side are performing contactless charging. At this time, a magnetic flux F is generated between the power transmission device 100a and the power reception device 100b as shown in FIG. Thereby, the power transmission device 100a supplies power in a direction (arrow Z) perpendicular to the central axis (arrow Y) of the winding 12. On the other hand, the power receiving device 100b receives power from a direction (arrow Z) perpendicular to the central axis (arrow Y) of the winding 12.

In addition, although illustration is abbreviate | omitted in FIG. 1, a solenoid coil has a bobbin for hold | maintaining a coil | winding with respect to a ferrite and positioning with respect to the

bottom face parts

20 and 23. FIG. The bobbin is shown in FIG.

The shield (an example of a shield member) is a member that shields the electromagnetic force generated from the solenoid coil, and includes

bottom surface portions

20 and 23 and

side surface portions

21 and 22 as a plurality of members. Each of these parts is a rectangular plate-like member and is made of a material (for example, metal) having an electromagnetic shielding effect. These may be formed by connecting a plurality of members, or may be formed integrally.

The bottom surface portion 20 is opposed to the surface having the maximum area in the solenoid coil (core 11). The bottom surface portion 20 is opposed to the bottom surface portion 23 with the solenoid coil interposed therebetween, and is in a positional relationship parallel to the bottom surface portion 23.

The

side surface portions

21 and 22 are provided between the bottom surface portion 20 and the bottom surface portion 23.

The bottom surface portion 23 is a reinforcing member for preventing the solenoid coil from falling off from the opening.

Also, the bottom surface portion 23 is provided immediately above a region where the winding 12 is present in the core 11 (hereinafter, referred to as a “winding region”), and is opposed to a surface of the winding region. In other words, the bottom surface portion 23 is provided in a space in which the region around which the winding 12 is wound is projected in the vertical direction indicated by the arrow Z. Therefore, the bottom portion 23 is not provided in the core 11 immediately above a region where the winding 12 is not present (hereinafter referred to as “no winding region”) and is open. In other words, the bottom surface portion 23 does not include a non-winding region in a space projected in the vertical direction indicated by the arrow Z. Since the magnetic flux is substantially parallel to the bottom surface portion 23 just above the winding region, the bottom surface portion 23 hardly links with the magnetic flux.

Further, in the shield, the two short sides of the bottom surface portion 20 (the longitudinal direction of the solenoid coil, that is, the surface perpendicular to the extension line of the arrow Y) are open.

Next, a longitudinal section of the non-contact charging device 100 will be described with reference to FIG. 3 is a diagram illustrating a configuration example of a cross section of the contactless charging device 100 in the longitudinal direction (A-A ′ in FIG. 1). In FIG. 3, the

side surface portion

21 or 23 is not shown.

The solenoid coil is positioned with respect to the

bottom surfaces

20 and 23 using the bobbin 13. The bobbin 13 surrounds the winding area. The space surrounded by the bobbin 13, the

bottom surfaces

20 and 23, and the side surfaces 21 and 22 (not shown) is filled with the material 14. The material 14 is solid or non-solid, and is non-conductive and non-magnetic. By filling this material 14, thermal coupling and mechanical coupling in the winding region, the bottom surface 20, and the bottom surface 23 (that is, between the shield and the winding) can be realized.

Such a non-contact charging apparatus 100 is attached to a vehicle when used as a non-contact power receiving apparatus. FIG. 4 is a side view showing an example in which contactless charging apparatus 100 is attached to a vehicle. In FIG. 4, the

side portions

21 and 23 are not shown.

For example, the non-contact charging device 100 of FIG. 3 is attached to the bottom of the vehicle body of a vehicle 200 (for example, a plug-in HEV or EV) as shown in FIG. As shown in FIG. 4, since the bottom surface portion 23 exists below the winding area, the solenoid coil can be prevented from falling off.

As described above, contactless charging apparatus 100 according to the present embodiment has bottom surface portion 23 as a reinforcing member in a portion that has been conventionally opened in the shield, so that the coil is prevented from falling off from the opening portion of the shield. And unnecessary radiation can be shielded. Further, since the bottom surface portion 23 is arranged at a position where the magnetic flux is substantially parallel (for example, directly above the region with the winding), the area where the bottom surface portion 23 and the magnetic flux interlink can be reduced. As a result, it is possible to suppress (reduce) the heat generation of the shield and the decrease in transmission efficiency.

Further, the non-contact charging device 100 includes a winding on the shield that is directly above the two short sides of the bottom surface portion 20 (a surface perpendicular to the longitudinal extension of the solenoid coil) and on the extension of the bottom surface portion 23. Locations opposite to the non-existing regions (spaces in which the non-winding region is projected in the vertical direction indicated by the arrow Z) are opened. Thereby, since there is no shield in the vicinity where the magnetic flux entering and exiting the solenoid coil is interlinked, it is possible to suppress the heat generation of the shield and the decrease in transmission efficiency. By shortening the longitudinal direction of the bottom surface portion 20 and the

side surface portions

21 and 22, the housing itself can be made small.

(Embodiment 2)
A non-contact charging apparatus according to Embodiment 2 of the present invention will be described.

First, the overall configuration of contactless charging apparatus 101 according to the present embodiment will be described with reference to FIG. 5A. FIG. 5A is a perspective view of contactless charging apparatus 101 according to the present embodiment. In FIG. 5A, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

5A, the non-contact charging apparatus 101 is different from the first embodiment in that it has

bottom surface portions

24a, 24b, and 24c (hereinafter referred to as “24a to c”). The bottom surface portions 24a to 24c are reinforcing members for preventing the solenoid coil from falling off. The bottom surface portions 24a to 24c are rectangular members having the same shape, and are made of a material (for example, metal) having an electromagnetic shielding effect.

The bottom surface portions 24a to 24c are opposed to the bottom surface portion 20 with the solenoid coil interposed therebetween, and are provided perpendicular to the

side surface portions

21 and 22, respectively. Therefore, the bottom surface portions 24a to 24c are in a positional relationship parallel to the bottom surface portion 20. Further, the bottom surface portions 24a to 24c are provided immediately above the winding area. In other words, the bottom surface portions 24a to 24c are not provided right above the no-winding region, and are open. As described above, since the magnetic flux is almost parallel to the bottom surface portions 24a to 24c just above the region with windings, the bottom surface portions 24a to 24c hardly interlink with the magnetic flux.

Further, the bottom surface portions 24a to 24c are provided with predetermined intervals, respectively. That is, there is an opening between the bottom surface portion 24a and the bottom surface portion 24b and between the bottom surface portion 24b and the bottom surface portion 24c, respectively. The distance between the openings is determined based on, for example, the fixed position of the solenoid coil and / or the heat dissipation structure. The fixed position of the solenoid is, for example, a position where the bobbin and the bottom surface portions 24a to 24c are fixed. The heat dissipation structure is, for example, a position where the bottom surface portions 24a to 24c are in contact with the material 14 and perform heat dissipation.

Next, a longitudinal section of the non-contact charging apparatus 101 will be described with reference to FIG. 5B. FIG. 5B is a diagram illustrating a configuration example of a cross section of the contactless charging apparatus 101 in the longitudinal direction (A-A ′ in FIG. 5A). In FIG. 5B, the

side surface portion

21 or 22 is not shown.

In FIG. 5B, the bottom surface portions 24a to 24c are provided directly above the region with winding where the magnetic flux F is substantially parallel to the bottom surface portions 24a to 24c. Further, the bottom surface portions 24a to 24c are provided with a predetermined interval, respectively. Although not shown in FIG. 5B, the bobbin 13 and the material 14 are provided as in FIG.

The non-contact charging apparatus 101 of the present embodiment described above can obtain the following functions and effects in addition to the functions and effects of the first embodiment described above. That is, contactless charging apparatus 101 includes bottom surface portions 24a to 24c with a predetermined interval right above the region with windings, and thus interlinks with magnetic flux as compared with bottom surface portion 23 of the first embodiment. The area can be reduced. As a result, the heat generation of the shield and the decrease in power transmission efficiency can be further suppressed.

(Embodiment 3)
A non-contact charging apparatus according to Embodiment 3 of the present invention will be described.

First, the overall configuration of contactless charging apparatus 102 according to the present embodiment will be described with reference to FIG. 6A. FIG. 6A is a perspective view of contactless charging apparatus 102 according to the present embodiment. In FIG. 6A, the same portions as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

6A, the non-contact charging apparatus 102 is different from the first embodiment in that the bottom surface portion 23 has heat radiation fins 25. A plurality of heat radiation fins 25 are provided on the upper surface of the bottom surface portion 23. The top surface of the bottom surface portion 23 is the back surface of the bottom surface portion 23 facing the region with the winding (the surface opposite to the surface facing the winding 12).

The heat radiating fins 25 are rectangular plate-like members, and are made of a material (for example, metal) having heat conduction and heat radiating effects. The longitudinal direction of the radiation fin 25 is arranged along the longitudinal direction of the solenoid coil. In addition, the radiation fins 25 are arranged at predetermined intervals in the longitudinal direction of the bottom surface portion 23. Since the magnetic flux is almost parallel to the heat radiating fins 25 just above the region with the windings, the heat radiating fins 25 hardly interlink with the magnetic flux.

Next, a longitudinal section of the non-contact charging apparatus 102 will be described with reference to FIG. 6B. 6B is a diagram illustrating a configuration example of a cross section of the non-contact charging device 102 in the longitudinal direction (A-A ′ in FIG. 6A). In FIG. 6B, illustration of the

side surface portion

21 or 22 is omitted.

6B, the bottom surface portion 23 and the radiating fin 25 are provided directly above the region with winding where the magnetic flux F is substantially parallel to the bottom surface portion 23 and the radiating fin 25. Although not shown in FIG. 6B, the bobbin and the material 14 are provided as in FIG. In this case, the material 14 has thermal conductivity and conducts heat from the winding 12 to the bottom surface portion 23. Then, the heat conducted to the bottom surface portion 23 is radiated from the radiation fins 25.

In the present embodiment, the radiating fin 25 is described as having a rectangular shape in the longitudinal direction. However, the shape is not limited to this, and for example, a trapezoidal shape or an arc shape may be used. It is preferably parallel to the central axis (arrow Y) of the line 12.

The non-contact charging apparatus 102 of the present embodiment described above can obtain the following functions and effects in addition to the functions and effects of the first embodiment described above. That is, since the non-contact charging device 102 includes the plurality of heat radiation fins 25 on the upper surface of the bottom surface portion 23, it is possible to efficiently realize heat radiation from the shield, that is, heat radiation of the coil. At this time, if the radiating fin 25 is parallel to the central axis of the winding 12, the radiating fin hardly interlinks with the magnetic flux, so that the radiating fin itself generates little heat, and further, the power transmission efficiency is not lowered by the radiating fin. .

(Embodiment 4)
A non-contact charging apparatus according to Embodiment 4 of the present invention will be described.

First, the overall configuration of contactless charging apparatus 103 according to the present embodiment will be described with reference to FIG. FIG. 7 is a perspective view of contactless charging apparatus 103 according to the present embodiment. In FIG. 7, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

7, the non-contact charging apparatus 103 is different from the first embodiment in the length of the side surfaces 26 and 27. That is, the long sides of the

side surface portions

26 and 27 are the same length as the short side of the bottom surface portion 23. Since the short side of the bottom surface portion 23 corresponds to a region with a winding, the side surfaces 26 and 27 are arranged only beside the region with a winding. In other words, the side surfaces 26 and 27 are provided in a space projected in a direction (arrow X) perpendicular to both the central axis (arrow Y) and the vertical direction (arrow Z) of the winding 12.

The non-contact charging apparatus 103 of the present embodiment described above can obtain the following functions and effects in addition to the functions and effects of the first embodiment described above. That is, in the non-contact charging device 103, since the length of the long sides of the

side surface portions

26 and 27 is the same as the length of the short side of the bottom surface portion 23, the longitudinal direction of the bottom surface portion 20 (long side, that is, the arrow Y direction). The housing itself can be made smaller by shortening.

As mentioned above, although each embodiment of this invention was described, the said description is an example and various deformation | transformation are possible. Further, the configurations of the respective embodiments may be appropriately combined within a possible range.

The disclosure of the specification, drawings and abstract contained in the Japanese application of Japanese Patent Application No. 2013-058004 filed on March 21, 2013 is incorporated herein by reference.

The present invention can be applied to, for example, a non-contact charging device including a shield that shields unnecessary radiation from a coil.

DESCRIPTION OF SYMBOLS 11 Core 12 Winding 13 Bobbin 14

Material

20, 23, 24a, 24b,

24c Bottom part

21, 22, 26, 27 Side part 25 Radiation fin 100 Non-contact charging device 200 Vehicle

Claims

A solenoid coil having windings;
A shielding member that shields electromagnetic force generated from the solenoid coil,
The solenoid coil feeds power in a direction perpendicular to the central axis of the winding using electromagnetic force, or receives power from the vertical direction using electromagnetic force,
The shield member is provided in a space in which a region with the winding is projected in the vertical direction.
Non-contact charging device.
The solenoid coil further includes a core member around which the winding is wound,
The shield member does not include a region in which the winding of the core member is not wound in a space projected in the vertical direction.
The contactless charging apparatus according to claim 1.
The shield member and the winding are coupled by a non-conductive and non-magnetic material,
The contactless charging apparatus according to claim 1.
The shield member is formed of a plurality of members.
The contactless charging apparatus according to claim 1.
The shield member is
A heat dissipating fin on the opposite surface of the surface facing the winding;
The contactless charging apparatus according to claim 1.
The radiating fin is disposed in parallel with the central axis of the winding,
The non-contact charging device according to claim 5.
The shield member is provided in a space in which a portion of the core member around which the winding is wound is projected in a direction perpendicular to both the central axis and the vertical direction of the winding.
The non-contact charging device according to claim 2.
The non-contact power transmission device in which the solenoid coil functions as a power transmission coil, or the non-contact power reception device in which the solenoid coil functions as a power reception coil.
The contactless charging apparatus according to claim 1.