CN111002781A

CN111002781A - Wireless power supply type light emitting component

Info

Publication number: CN111002781A
Application number: CN201910892069.2A
Authority: CN
Inventors: 祖父江弘; 柴田实; 永井浩美
Original assignee: Toyoda Gosei Co Ltd
Current assignee: Toyoda Gosei Co Ltd
Priority date: 2018-10-04
Filing date: 2019-09-20
Publication date: 2020-04-14
Anticipated expiration: 2039-09-20
Also published as: JP7043006B2; JP2020058195A; CN111002781B

Abstract

Provided is a wireless power supply type light emitting component capable of suppressing a reduction in current flowing through a power receiving coil due to the placement of a metal component near the power receiving coil for the purpose of improving design. A knob (N1) serving as a wireless power supply type light emitting component is provided with: a handle (173) for operation by a user; a light emitting device (150) housed inside the handle (173); a power receiving coil (120) that supplies power for driving the light emitting device (150); and a metal member (180) connected to the handle (173). The metal member (180) is C-shaped.

Description

Wireless power supply type light emitting component

Technical Field

The technical field of the present specification relates to a wireless power supply type light emitting part that emits light by wireless power supply.

Background

In recent years, techniques for wirelessly supplying power to portable communication terminals such as smartphones and other electronic devices have been actively studied and developed. In addition, a technology for wirelessly supplying power to an electronic device for a vehicle is also being developed.

For example, patent document 1 discloses a technique for wirelessly supplying power to an operation unit of an air conditioner of an automobile. By disposing the power transmission coil around the vehicle air conditioner, power is supplied to the LED of the operation unit that adjusts the wind direction of the vehicle air conditioner. (fig. 8 of patent document 1).

Patent document 1: japanese patent laid-open publication No. 2016-2921

In some cases, design of vehicle components such as an automobile air conditioner is emphasized depending on the vehicle type. In order to realize a highly designable interior, it is necessary to use a metal member for the operation portion. This is to evoke the user's needs.

For example, assume that a ring-shaped metal member is used for a handle operated by a user. If a ring-shaped metal member is present in the vicinity of the power receiving coil, an eddy current flows through the metal member. The eddy current flows in a direction of canceling the magnetic field formed by the power transmission coil. The magnetic field generated by the eddy current weakens in the vicinity of the power receiving coil. Thus, the current flowing through the power receiving coil is weakened. That is, the efficiency of wireless power supply may be extremely reduced.

Disclosure of Invention

An object of the present invention is to provide a wireless power supply type light emitting component capable of suppressing a decrease in current flowing through a power receiving coil due to a metal member disposed near the power receiving coil for the purpose of improving design.

The wireless power supply type light emitting component in the 1 st mode comprises: a handle for operation by a user; a light emitting device housed inside the handle; a power receiving coil that supplies power for driving the light emitting device; and a metal member connected to the handle. The metal part is C-shaped.

The wireless power supply type light emitting part is an operation part operated by a user. The operation portion emits light so as to be easily visible to a user. Since the operation unit is disposed at a position where it is difficult to wire electric wiring from a power supply, the operation unit emits light by wireless power supply. Here, the metal member is C-shaped, and therefore, there is little fear that the metal member cancels out the magnetic field formed by the power transmission coil due to eddy current. That is, although the light emitting member has a metal member close to a ring shape, the light emitting member of a high wireless power supply type has high power supply efficiency.

ADVANTAGEOUS EFFECTS OF INVENTION

The present specification provides a wireless power supply type light emitting component capable of suppressing a reduction in current flowing through a power receiving coil due to a metal member disposed in the vicinity of the power receiving coil for the purpose of improving design.

Drawings

Fig. 1 is a schematic diagram showing a situation in a vehicle interior in embodiment 1.

Fig. 2 is a schematic diagram showing a schematic configuration of the wireless power feeding system according to embodiment 1.

Fig. 3 is a perspective view showing the knob according to embodiment 1.

Fig. 4 is a part development view of the knob in embodiment 1.

Fig. 5 is a diagram (1) showing a state in which the power transmission coil and the housing are fixed in embodiment 1.

Fig. 6 is a diagram (2) showing a state in which the power transmission coil and the housing are fixed in embodiment 1.

Fig. 7 is a partial sectional view showing a part of the section VII-VII of fig. 6.

Fig. 8 is a diagram showing the shape of the power transmission coil in embodiment 1.

Fig. 9 is a diagram schematically showing a circuit of the wireless power feeding system according to embodiment 1.

Fig. 10 is a diagram for explaining mounting of the power transmission coil and the housing in a modification of embodiment 1.

Description of the reference numerals

100 … wireless power supply system

110 … power transmission coil

120 … power receiving coil

130 … power transmission circuit

140 … power receiving circuit

150 … light emitting device

160 … frame body

170 … casing

171 … groove

172 … Window

173 … handle

180 … Metal Member

181 … end

182 … end

N1 … knob

Detailed Description

In the following, a description will be given of a specific embodiment by taking a wireless power supply type light emitting part as an example. However, the technique in the present specification is not limited to these embodiments.

(embodiment 1)

1. Vehicle-mounted component

Fig. 1 is a schematic view showing a situation inside a vehicle. As shown in fig. 1, an instrument panel IP is present on the front surface of the driver's seat of the vehicle. A plurality of car air conditioners CA1 are provided in the instrument panel IP. The car air conditioner CA1 has a housing 160 and a knob N1 for the user to adjust the direction of the wind. The knob N1 is an operation unit for the user to adjust the direction of the wind of the vehicle air conditioner CA 1. Knob N1 is capable of emitting light. This is to enable the user to easily grasp the position of the knob N1 even when the vehicle interior is dark.

2. Wireless power supply system

Fig. 2 is a schematic diagram showing a schematic configuration of the wireless power feeding system 100 according to embodiment 1. The wireless power supply system 100 performs magnetic field coupling type wireless power supply. As shown in fig. 2, the wireless power supply system 100 includes 1 power transmission coil 110, 2 power reception coils 120, a power transmission circuit 130, a power reception circuit 140, a light-emitting device 150, and a housing 160.

In fig. 2, the power receiving coil 120 is drawn in a shape close to a square shape in order to conceptually represent the power receiving coil 120. However, in practice, the shape of the power receiving coil 120 is a shape close to a coil spring as described later.

The resonant frequency of the wireless power supply system 100 is 6.78 MHz. Therefore, the frequency of the current flowing through the power transmission coil 110 and the power reception coil 120 is 6.78 MHz. The resonant frequency of the LC circuit of power transmission coil 110 is also 6.78 MHz. The resonant frequency of the LC circuit of the power receiving coil 120 is also 6.78 MHz. The frequency of the current flowing in the power transmission coil 110 by the power transmission circuit 130 is also 6.78 MHz. In practice, sometimes slightly deviates from the target frequency. Further, 6.78MHz is exemplified, but a resonance frequency of 15MHz of 500kHz or more may be adopted. Resonance frequencies other than those described above may also be used.

The power transmission coil 110 is a coil for forming a magnetic field around the power receiving coil 120. The power transmission coil 110 is connected in series with a capacitor described later. The power transmission coil 110 is formed of a wire. Examples of the wire material include single wires and twisted wires. The material of the power transmission coil 110 is, for example, copper. The power transmission coil 110 is provided in a shape surrounding 2 quadrangles. Power transmission coil 110 is hollow. The number of turns of the power transmission coil 110 may be greater than or equal to 1 and less than or equal to 3. Of course, not limited to this numerical range. Further, in fig. 2, the number of turns of the power transmission coil 110 is 1.

The power receiving coil 120 supplies power for driving the light emitting device 150. The power receiving coil 120 generates an electric current by a magnetic field formed by the power transmitting coil 110. The power receiving coil 120 is connected in series with a capacitor described later. The power receiving coil 120 is made of a wire rod. Examples of the wire material include single wires and twisted wires. The material of the power receiving coil 120 is, for example, copper.

The power transmission circuit 130 is a circuit for oscillating an ac voltage flowing through the power transmission coil 110. Power transmission circuit 130 generates an alternating current of 6.78 MHz.

The power receiving circuit 140 is a circuit for converting a current flowing through the power receiving coil 120 into a current suitable for the light emitting device 150. Specifically, the ac voltage of the power receiving coil 120 is converted into a dc voltage for driving the light emitting device 150. The power receiving circuit 140 may have other functions such as a rectifier circuit.

The light emitting device 150 is used to show the position of the knob N1 to the user in an easily known manner even in a dim vehicle. The light emitting device 150 is an electronic component driven by power from the power receiving coil 120. The light emitting device 150 constitutes a part of a knob N1 of an air conditioner for a vehicle. The light-emitting device 150 has a semiconductor light-emitting element. The light emitting device 150 emits light by a dc voltage. The light-emitting device 150 is an electronic device or an electronic component. The knob N1 is an operation unit operated by the user. By changing the position of the knob N1, the user can adjust the wind direction of the vehicle air conditioner CA 1.

The housing 160 is a casing of the car air conditioner CA 1. That is, the device surrounded by the casing 160 is the car air conditioner CA 1. The frame 160 is made of, for example, plastic. The frame 160 is a housing of the device, and thus, has a very thin thickness.

3. Operation part (knob)

As described above, the knob N1 is an operation unit for the user to adjust the wind direction of the vehicle air conditioner CA 1. At least a portion of the knob N1 is exposed from the frame 160 to enable a user to directly contact the knob N1.

3-1. Metal parts

Fig. 3 is a perspective view showing a knob N1 according to the present embodiment. As shown in fig. 3, the knob N1 has a metal member 180. The metal member 180 is a metal member that improves the design of the knob N1. The metal member 180 is formed in a "C-shape". The metal member 180 has annular slit-corresponding

end portions

181 and 182. End 181 is the 1 st end. End 182 is the 2 nd end. End 181 and end 182 oppose each other.

A gap exists between opposing ends 181 and 182. The gap between end 181 and end 182 is greater than or equal to 0.5mm and less than or equal to 2 mm. The above numerical ranges are merely examples, and numerical values other than those described above may be used.

Examples of the material of the metal member include iron and copper. Of course, other materials may be used.

3-2. outer casing

Fig. 4 is a part development view of the knob N1 of the present embodiment. As shown in fig. 4, the knob N1 includes a power receiving coil 120, a power receiving circuit 140, a light emitting device 150, a housing 170, and a metal member 180.

The housing 170 is a housing of the knob N1. The housing 170 has a slot 171, a window 172, and a handle 173. The material of the housing 170 is non-metal. The material of the housing 170 is, for example, resin such as rubber, or plastic. The handle 173 is cylindrical in shape.

The groove 171 is used to embed the metal member 180. Therefore, the groove 171 has a shape corresponding to the C-shape of the metal member 180. The housing 170 has a protrusion 171a that fills the gap between the

end portions

181 and 182. The window 172 is used to take out light from the light emitting device 150 to the outside of the knob N1. The grip 173 is a grip portion for a user to pinch the knob N1. Thus, the handle 173 is located on the outer side of the housing 170. The user adjusts the wind direction of the vehicle air conditioner CA1 by operating the position of the knob N1 while pinching the knob 173.

The power receiving coil 120, the power receiving circuit 140, and the light emitting device 150 are housed inside the case 170. That is, the power receiving coil 120, the power receiving circuit 140, and the light emitting device 150 are housed inside the handle 173. The metal member 180 is coupled to the handle 173.

3-3. current receiving coil

As shown in fig. 4, the power receiving coil 120 is spiral-shaped. The power receiving coil 120 is wound in a layered manner in the z-axis direction described later. That is, the coil is wound not so as to be housed in the same plane but so as to be stacked in the z-axis direction perpendicular to the plane surrounding the coil.

The area of the surface surrounded by 1 circumference of the power receiving coil 120 is sufficiently smaller than the area of the surface surrounded by 1 circumference of the power transmission coil 110. The ratio of the area of the surface surrounded by the power receiving coil 120 to the area of the surface surrounded by the power transmitting coil 110 is greater than or equal to 1/200 and less than or equal to 1/10. This is only an object, and may be a value other than the above.

4. Power transmission coil

4-1. fixed state of power transmission coil and frame body

Fig. 5 is a view (1) showing a state in which the power transmission coil 110 and the housing 160 are fixed. As shown in fig. 5, a groove 161 is formed in the outer wall of the frame 160. The power transmission coil 110 is disposed so as to be accommodated in the groove 161 of the housing 160. Thus, the power transmission coil 110 is fixed to the frame 160.

Fig. 6 is a view (2) showing a state in which the power transmission coil 110 and the housing 160 are fixed. As shown in fig. 6, the power transmission coil 110 may be fixed to the frame 160. Fig. 7 is a partial sectional view showing a part of the section VII-VII of fig. 6. As shown in fig. 6, a claw 162 is formed on the outer wall of the frame 160. The power transmission coil 110 is positioned and fixed to the frame 160 by a plurality of claws 162. The claw 162 is a support member for fixing the power transmission coil 110.

As described above, other support members may be used as long as the power transmission coil 110 can be positioned and fixed relative to the housing 160. In addition, the frame body 160 and the power transmission coil 110 may be in contact with each other in one portion.

Further, the groove 161 of the frame body 160 or the support member does not completely cover the power transmission coil 110, and at least a part of the power transmission coil 110 is in contact with the atmosphere. That is, the power transmission coil 110 is not encapsulated by a non-conductive material.

4-2. shape of Power Transmission coil

Fig. 8 is a diagram showing the shape of the power transmission coil 110. In fig. 8, the power transmission coil 110 has 1 turn. The surface surrounded by the power transmission coil 110 is a plane. That is, the power transmission coil 110 has a planar shape lying on 1 plane. The surface surrounded by the power transmission coil 110 is taken as the xy plane. The z-axis is taken in a direction perpendicular to the plane surrounded by the transmission coil 110.

The length of the power transmission coil 110 in the x-axis direction is, for example, 10mm or more and 400mm or less. Preferably greater than or equal to 80mm and less than or equal to 350 mm. The length of the power transmission coil 110 in the y-axis direction is, for example, 10mm or more and 400mm or less. Preferably greater than or equal to 50mm and less than or equal to 100 mm. The length of the power transmission coil 110 in the z-axis direction is, for example, 0.5mm or more and 10mm or less. These numerical ranges are only intended and may be other than the above.

As shown in fig. 8, the power transmission coil 110 has a1 st region 111, a 2 nd region 112, and a coupling portion 113. The 1 st zone 111 is a portion surrounding the housing 160 of the 1 st car air conditioner. The 2 nd area 112 is a portion surrounding the casing 160 of the 2 nd car air conditioner. The connection portion 113 is a portion connecting the 1 st region 111 and the 2 nd region 112.

The 1 st region 111 has 4

sides

111a, 111b, 111c, 111 d. The 4

sides

111a, 111b, 111c, and 111d generate magnetic fields near the center of the 1 st region 111, respectively. Thus, since the 4

sides

111a, 111b, 111c, and 111d surround the housing 160, a relatively strong magnetic field is formed around the housing 160.

Region 2 has 4

sides

112a, 112b, 112c, 112 d. The 4

sides

112a, 112b, 112c, 112d each generate a magnetic field near the center of the 2 nd region 112. Thus, since the 4

sides

112a, 112b, 112c, and 112d surround the housing 160, a relatively strong magnetic field is formed around the housing 160.

Thus, the power transmission coil 110 has 4 sides surrounding the frame 160.

The power transmission coil 110 of the present embodiment can form a stronger magnetic field than in the case where the

sides

111d and 112d are very short or do not exist. Further, since the power transmission coil 110 has the side 111d and the side 112d, the power transmission coil 110 is easily fixed to the frame 160.

5. Positional relationship between metal member and power transmission coil

The central axis in the case where the metal member 180 is a circular ring is preferably aligned with the z-axis direction. That is, the flat surface 110s (see fig. 5) of the planar power transmission coil 110 and the flat surface 180s (see fig. 4) of the metal member 180 are preferably parallel to each other. In practice, the knob N1 is operated by the user, and therefore, the plane 110s and the plane 180s are not necessarily parallel. However, the angle formed by the plane 110s and the plane 180s is preferably greater than or equal to 0 ° and less than or equal to 15 °. In this case, the plane surrounded by the reception coil 120 and the plane 110s of the power transmission coil 110 are substantially parallel.

6. Circuit of wireless power supply system

Fig. 9 is a diagram schematically showing a circuit of the wireless power feeding system 100 according to the present embodiment. As shown in fig. 9, power transmission coil 110 forms an LC series circuit together with capacitor C1. The power receiving coil 120 and the capacitor C2 together form an LC series circuit. As described above, the circuit design is performed so that the resonance frequency of the LC series circuit on the power transmission coil 110 side and the resonance frequency of the LC series circuit on the power reception coil 120 side are equal to each other.

The power transmission output in the wireless power supply system 100 is less than or equal to 10W. For example 5W. The voltage for driving the light emitting device 150 is, for example, 5V. Of course, other values than those described above are also possible. The current flowing through the light emitting device 150 is less than or equal to 1 mA. Of course, other values than those described above are also possible.

In fig. 9, capacitor C1 is depicted as being located outside power transmission circuit 130. Fig. 9 is a conceptual diagram, and capacitor C1 may be included in power transmission circuit 130. Similarly, the capacitor C2 may be in the power receiving circuit 140.

7. Effects of the present embodiment

The metal member 180 can be disposed in the operation portion (knob N1) of the vehicle air conditioner. Since the metal member 180 has a C-shape, an eddy current hardly occurs in the metal member 180. Therefore, the metal member 180 can be disposed in a region close to the power receiving coil 120. This can improve the design of the in-vehicle component and the flexibility of design in the in-vehicle component.

The power receiving coil 120 is preferably located within the plane surrounded by the power transmission coil 110, but may be displaced in the z-axis direction for the sake of convenience in mounting the vehicle-mounted components. Since the wireless power feeding system 100 employs a magnetic field coupling system, even if the z-axis displacement between the power transmission coil 110 and the power reception coil 120 is, for example, about several tens of cm, power can be fed to the light emitting device 150 without any problem. In this way, in the magnetic field coupling type, the distance between the power transmission coil 110 and the power reception coil 120 can be set relatively long. In this way, even when the power transmission coil 110 and the power receiving coil 120 are separated from each other, a metal member can be disposed around the power receiving coil 120.

8. Modification example

8-1 high resistance component

A material having high resistance may be disposed at the position of the protrusion 171a of the case 170. For example, an insulating member such as plastic is disposed between end 181 and end 182. Thus, there is little concern that the metal member 180 will cancel the magnetic field generated by the power transmission coil 110.

8-2. device with frame

The device having the housing 160 of the present embodiment is a car air conditioner. However, it can be used for other vehicle-mounted components. Such as a vehicle audio. Alternatively, the present invention can be applied to a device having an operation unit that is operated by a user, such as a home appliance other than an in-vehicle component.

8-3 power receiving coil

In the present embodiment, the power receiving coil 120 is housed inside the knob N1. However, the power receiving coil 120 may be housed outside the knob N1.

8-4 lens

In the present embodiment, a window 172 is formed in the housing 170. Instead of the window 172, a lens separate from the housing 170 may be disposed.

8-5 installation of power transmission coil

Fig. 10 is a diagram for explaining the attachment of the power transmission coil 110 and the housing 160 in a modification of embodiment 1. As shown in fig. 10, the power transmission coil 110 may be attached to the substantially rectangular parallelepiped housing 160 in an inclined manner.

8-6 support parts

The support member provided in the frame 160 may have another shape or structure. For example, a jig, a spacer, or the like can be employed.

8-7 lamination direction of power transmission coil

When the power transmission coil 110 is wound up to 2 turns or more, it is stacked in the z-axis direction, as in the power receiving coil 120 of fig. 4. That is, the coil is wound in a stacked manner in a direction intersecting a surface surrounded by the coil.

8-8. wireless power supply mode

The wireless power feeding system 100 of the present embodiment is a magnetic field coupling system. The technique of embodiment 1 can also be applied to a wireless power supply system of an electromagnetic induction system. However, the magnetic field coupling method is preferable because the distance between the coils can be set large.

8-9. combination

The above modifications may be freely combined.

(attached note)

In the wirelessly powered light emitting component in the 2 nd aspect, the metal component has the 1 st end and the 2 nd end that are opposite. An insulating member is disposed between the 1 st end and the 2 nd end.

The wireless power supply type light emitting component in the 3 rd aspect is an operation portion of an automobile air conditioner.

The wireless power supply type light emitting unit according to claim 4 includes a capacitor connected in series to the power receiving coil.

Claims

1. A wireless power supply type light emitting component is characterized by comprising:

a handle for operation by a user;

a light emitting device housed inside the handle;

a power receiving coil that supplies power for driving the light emitting device; and

a metal member coupled to the handle,

the metal part is C-shaped.

2. The wirelessly powered lighting component of claim 1,

the metal component has opposite 1 st and 2 nd ends,

an insulating member is disposed between the 1 st end portion and the 2 nd end portion.

3. Wireless powered lighting component according to claim 1 or 2,

the wireless power supply type light emitting component is an operation part of an automobile air conditioner.

4. Wireless powered lighting component according to any one of claims 1 to 3,

has a capacitor connected in series with the power receiving coil.