JP5843271B2 - Power transmission equipment - Google Patents

Description

  The present invention relates to a technical field of a power transmission device capable of supplying power without contact.

  As this type of device, for example, a non-contact power transmission device has been proposed that includes a power transmission antenna that is disposed so as to be horizontally opposed to a power receiving antenna mounted on the rear portion of an electric vehicle (see Non-Patent Document 1).

Alternatively, an apparatus has been proposed in which electric power is supplied in a non-contact manner from a primary power supply line provided on one side of a track to a secondary winding provided in a robot moving on the track. Here, in particular, it is described that a side plate is provided so as to surround the primary power supply line and the secondary winding in order to prevent the insertion of foreign matter from the outside or to suppress the radiation amount of electromagnetic waves. (See Patent Document 1 ).

JP 2003-319504 A

YOKOI, Yuiko, et al., “DEVELOPMENT OF KW CLASS WIRELESS POWER TRANSMISSION SYSTEM FOR EV USING MAGNETIC RESONANT METHOD,” 1st International Electric Vehicle Technology Conference 2011, Society of Automotive Engineers of Japan, Inc., Pacifico Yokohama, Yokohama, Japan, May 17-19, 2011.

  However, the technique described in Non-Patent Document 1 has a technical problem in that it may be difficult to control the electric vehicle and make the distance between the power receiving antenna and the power transmitting antenna appropriate. Moreover, the technique described in Patent Document 1 has a technical problem that it is extremely difficult to apply to a vehicle such as an electric vehicle.

  The present invention has been made in view of the above problems, for example, and can maintain an appropriate distance between the power receiving antenna and the power transmitting antenna, thereby preventing leakage of electromagnetic waves between the power receiving antenna and the power transmitting antenna. It is an object to propose a power transmission device that can be suppressed.

In order to solve the above-described problem, the power transmission device of the present invention is a power transmission device capable of transmitting power in a contactless manner to a power receiving device including a power receiving antenna. A power transmission antenna disposed opposite to the power transmission antenna, a first shielding unit that covers a part of the periphery of the power transmission antenna except at least a part below the power transmission antenna, and shields electromagnetic waves from the power transmission antenna; during power transmission, the power transmission of the periphery of the antenna covers at least a portion of the lower of the said power transmission antenna which is not covered by the first shielding portion, and a second shielding portion for shielding the electromagnetic wave, said first The second shielding part does not cover at least a part of the periphery of the power transmission antenna that is not covered by the first shielding part except for the power transmission .

According to the power transmission device of the present invention, the power transmission device can transmit power to the power receiving device including the power receiving antenna in a non-contact manner using, for example, a magnetic resonance method. Power transmission antenna, at the time of the power transmission, is arranged to face the power receiving antenna.

The first shielding part covers at least part of the periphery of the power transmission antenna except at least a part below the power transmission antenna, and shields electromagnetic waves from the power transmission antenna. The second shielding unit covers at least a part of the periphery of the power transmission antenna that is not covered by the first shielding unit around the power transmission antenna during power transmission, and shields electromagnetic waves from the power transmission antenna. In addition, the 1st shielding part and the 2nd shielding part may be net | network shape, a grid | lattice form, etc., as long as it shields electromagnetic waves. Moreover, the 1st shielding part and the 2nd shielding part may have a part which mutually overlaps.

  Here, according to the inventor's research, the following matters have been found. That is, in order to suppress leakage of electromagnetic waves, a technique has been proposed in which a cylindrical cover made of metal such as aluminum is installed at least around the power transmission antenna. However, when there is no power receiving antenna, since one of the cylindrical covers is open, there is a possibility that a foreign object such as an empty can may enter the cylindrical cover. When the user starts power transmission without noticing the foreign object, a problem may occur due to the foreign object.

However, in the present invention, the first shielding portion and the second shielding portion cover the periphery of the power transmission antenna when power is transmitted, but at least a part below the power transmission antenna is not covered except when power is transmitted. (Ie open). For this reason, even if a foreign object enters into the first shielding part other than during power transmission, the foreign object that has entered is discharged from at least a part below the power transmission antenna due to the influence of gravity .

As a result, according to the power transmission device of the present invention, it is possible to prevent foreign matter from remaining while suppressing leakage of electromagnetic waves during power transmission .

Note that “power transmission” is not limited to when power transmission is actually performed, but is a period for a predetermined preparation that is performed prior to power transmission, or post-processing performed after power transmission. For a period of time .

In another aspect of the power transmission device of the present invention, the first shielding portion, the length in the direction along the direction perpendicular to the transmission plane of the transmission antennas, when the transmission of the power, the power transmitting antenna and the receiving antenna It is formed so that the transmission efficiency between them becomes a predetermined value or more.

  According to this aspect, the distance between the power receiving antenna and the power transmitting antenna can be set to an appropriate distance with relative ease. The “predetermined value” may be set as, for example, a lower limit value of transmission efficiency that can be accepted by a contractor who implements the power transmission apparatus.

In this aspect, on the condition that the first shielding unit comes into contact with the power receiving device, the second shielding unit is below the power transmission antenna that is not covered by the first shielding unit around the power transmission antenna. Control means for controlling the second shielding part may be further provided so as to take a position covering at least a part of the second shielding part.

  If comprised in this way, the circumference | surroundings of a power transmission antenna can be appropriately covered with a 1st shielding part and a 2nd shielding part.

  In the aspect provided with a control means, you may further provide the nonelectroconductive part arrange | positioned so as to oppose the said power transmission surface ahead of the said power transmission surface, and comprised with the nonelectroconductive material.

  If comprised in this way, it can suppress effectively that a foreign material penetrate | invades, and it is very advantageous practically.

  In the aspect provided with a nonelectroconductive part, the said 1st shielding part may be comprised so that expansion-contraction is possible in the direction in alignment with the direction perpendicular | vertical to the said power transmission surface.

  If comprised in this way, while being able to achieve size reduction of the said electric power transmission apparatus, it can suppress effectively that a foreign material enters.

  The effect | action and other gain of this invention are clarified from the form for implementing demonstrated below.

It is a block diagram which shows the structure of the electric power transmission apparatus which concerns on embodiment. It is a perspective view which shows the structure of the shielding part of the power transmission antenna which concerns on embodiment. It is a flowchart which shows the power transmission control process which concerns on embodiment. It is a perspective view which shows the structure of the shielding part of the power transmission antenna which concerns on the 1st modification of embodiment. It is a perspective view which shows the structure of the shielding part of the power transmission antenna which concerns on the 2nd modification of embodiment. It is a perspective view which shows the structure of the shielding part of the power transmission antenna which concerns on the 3rd modification of embodiment.

  Hereinafter, embodiments according to the power transmission device of the present invention will be described with reference to the drawings.

  The configuration of the power transmission device according to the embodiment will be described with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of a power transmission device according to the embodiment.

  1, the power transmission device 100 includes a control / communication unit 101, a power transmission antenna 102, a power transmission device 103, a power supply device 104, a first shielding unit 111, and a second shielding unit 112.

  On the other hand, the power receiving device 200 mounted on the vehicle 1, for example, an electric vehicle or the like includes a control / communication unit 201, a power receiving antenna 202, a rectifier 203, a converter 204, and a battery 205.

  The power transmission surface 102a of the power transmission antenna 102 is along a direction perpendicular to the ground. The power receiving surface of the power receiving antenna 202 is also along the direction perpendicular to the ground, and when power is transferred between the power transmitting antenna 102 and the power receiving antenna 202, the power transmitting antenna 102 and the power receiving antenna 202 are arranged horizontally opposite to each other. Is done.

  When the power is transmitted, the control / communication unit 101 and the control / communication unit 201 perform, for example, authentication and transmission / reception of information related to power, etc., and based on the received information related to power, etc. The transmission device 100 and the power receiving device 200 are controlled.

  Note that power transmission between the power transmission device 100 and the power receiving device 200 is preferably performed by a magnetic resonance method. This is because the magnetic field resonance method has a feature that a decrease in transmission efficiency is relatively small even when the power transmitting antenna 102 and the power receiving antenna 202 are not accurately opposed to each other.

  As shown in FIG. 1, when the power receiving antenna 202 is disposed at the rear portion of the vehicle 1, the position of the power receiving antenna 202 in the height direction changes as the vehicle height changes due to, for example, the load weight of the vehicle 1. To do. In this case, if the power transmitting antenna 102 and the power receiving antenna 202 must be aligned with high accuracy, the burden on the user will be significantly increased. However, if the magnetic field resonance method is used, the burden on the user related to the alignment can be reduced, which is very advantageous in practice.

  The first shielding unit 111 covers the periphery of the power transmission antenna 102 except for at least a part below the power transmission antenna 102 and shields electromagnetic waves (electromagnetic fields). On the other hand, the second shielding unit 112 covers at least a portion of the periphery of the power transmission antenna 102 that is not covered by the first shielding unit 111 and shields electromagnetic waves when power is transmitted. That is, at least a part below the power transmission antenna 102 is not covered except during power transmission (see FIG. 2B).

  Here, for example, if the periphery of the power transmission antenna 102 is always covered as in the shielding unit 300 shown in FIG. 2A, foreign matter (for example, a metal such as an empty can) that has jumped in from the outside is shielded. If the user stays inside the unit 300 and the user starts power transmission without noticing the foreign object, the power transmission apparatus 100 may be affected by, for example, heat generation of the foreign object.

  On the other hand, in the present embodiment, as described above, at least a part of the lower portion of the power transmission antenna 102 is not covered except when power is transmitted, so that foreign matter that has jumped in from the outside is below the first shielding portion 111. It will fall from. That is, the first shielding part 111 and the second shielding part 112 according to the present embodiment can prevent foreign matters from staying inside the shielding part. As a result, it is possible to prevent problems caused by foreign matter.

  The first shielding part 111 and the second shielding part 112 may be formed of a metal material such as aluminum, for example, or formed by attaching a magnetic body inside a cover formed of an insulating material, for example. May be.

  The length in the direction along the direction perpendicular to the power transmission surface 102a of the first shielding unit 111 (the “X-axis” direction in FIG. 2) indicates that the transmission efficiency between the power transmission antenna 102 and the power reception antenna 202 is a predetermined value during power transmission. It is set to be the above. If comprised in this way, the distance between the power transmission antenna 102 and the power receiving antenna 202 will be set to an appropriate distance simply by parking the vehicle 1 so that the rear part of the vehicle 1 contacts the end of the first shielding part 111, for example. Can be.

  Further, the size of the opening formed by the first shielding part 111 and the second shielding part 112 (that is, the end part on the vehicle 1 side of each of the first shielding part 111 and the second shielding part 112) is set as the power transmission antenna. If it is made larger than the size of the power transmission surface 102a of 102, the burden on the user related to alignment can be reduced, which is very advantageous in practice.

  Next, power transmission control processing performed by the control / communication unit 101 of the power transmission apparatus 100 will be described with reference to the flowchart of FIG. 3.

  In FIG. 3, the control / communication unit 101 determines whether or not the first shielding unit 111 is in contact with the receiving unit (that is, the rear portion of the vehicle 1) (step S101). Whether or not the first shielding unit 111 is in contact with the receiving unit may be determined, for example, by detecting the pressure applied to the first shielding unit 111 with a pressure sensor or the like.

  When it determines with the 1st shielding part 111 not contacting the receiving part (step S101: No), the control and communication part 101 performs the process of step S101 again. On the other hand, when it is determined that the first shielding unit 111 is in contact with the receiving unit (step S101: Yes), the control / communication unit 101 determines whether the second shielding unit 112 has been slid (that is, the second It is determined whether or not the power transmission antenna 102 is covered by the shielding unit 112 (step S102).

  When it is determined that the second shielding unit 112 is not slid (step S102: No), the control / communication unit 101 performs the process of step S102 again. On the other hand, when it determines with the 2nd shielding part 112 having been slid (step S102: Yes), the control and communication part 101 controls the power transmission apparatus 103 etc. to transmit electric power (step S103).

<First Modification>
Next, a first modification of the embodiment will be described with reference to FIG. FIG. 4 is a perspective view illustrating a configuration of a shielding portion of the power transmission antenna according to the first modification of the embodiment.

  In the first modified example, the second shielding portion 112 is stored in the casing of the power transmission device 100, and when the power is transmitted, the second shielding portion 112 is placed outside the casing as shown in FIG. It is configured to protrude.

<Second Modification>
Next, a second modification of the embodiment will be described with reference to FIG. FIG. 5 is a perspective view illustrating a configuration of the shielding portion of the power transmission antenna according to the second modification of the embodiment.

  In the second modification, the first shielding part 111 is constituted by a first part 111a and a second part 111b. When the power is not being transmitted, the second portion 111b slides so as to overlap the first portion 111a. The second portion 111b is not limited to a slide type, and may be a foldable type.

<Third Modification>
Next, a third modification of the embodiment will be described with reference to FIG. FIG. 6 is a perspective view illustrating the configuration of the shielding portion of the power transmission antenna according to the third modification of the embodiment.

  In the third modification, the power transmission device 100 is further provided with a non-conductive portion 113 that is disposed so as to face the power transmission surface 102a of the power transmission antenna 102 and is configured of a non-conductive material. If comprised in this way, the penetration | invasion of the foreign material from the outside can be prevented. In this case, the second shielding part 112 may always cover the power transmission antenna 102.

  In the above-described embodiment, an example in which the shielding unit is provided on the power transmission side (that is, in the power transmission device 100) has been described, but the shielding unit may be provided in the power receiving device 200.

  In the above-described embodiment, the case where the power transmission device of the present invention is used as a charging device for the battery 205 mounted on the vehicle 1 such as an electric vehicle is taken as an example, but the power transmission device of the present invention is For example, the present invention can be applied to a charging device such as a battery mounted on an audio / visual device or a home appliance.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification. Moreover, it is included in the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 100 ... Electric power transmission apparatus, 101, 201 ... Control and communication part, 102 ... Power transmission antenna, 103 ... Power transmission apparatus, 104 ... Power supply apparatus, 111 ... 1st shielding part, 112 ... 2nd shielding part, 113 ... Non-conductive part, 200 ... power receiving device, 202 ... power receiving antenna, 203 ... rectifier, 204 ... converter, 205 ... battery

Claims (5)

A power transmission device capable of transmitting power contactlessly to a power receiving device including a power receiving antenna,
A power transmission antenna disposed opposite to the power receiving antenna during power transmission;
Except at least a part below the power transmission antenna, a first shielding part that covers a part of the periphery of the power transmission antenna and shields electromagnetic waves from the power transmission antenna;
A second shielding part that covers at least a part of the periphery of the power transmission antenna that is not covered by the first shielding part and shields the electromagnetic wave during power transmission ; and
Equipped with a,
The second shielding part does not cover at least a part below the power transmission antenna that is not covered by the first shielding part, around the power transmission antenna, except when the power is transmitted.
A power transmission device characterized by that. The first shielding portion has a length in a direction along a direction perpendicular to a power transmission surface of the power transmission antenna such that transmission efficiency between the power transmission antenna and the power reception antenna is equal to or greater than a predetermined value when the power is transmitted. The power transmission device according to claim 1, wherein the power transmission device is formed. On the condition that the first shield part contacts the power receiving device, the second shield part is at least a part below the power transmission antenna that is not covered by the first shield part around the power transmission antenna. to take the position covering the power transmission apparatus according to claim 1 or 2 control means for controlling said second shielding portion, and further comprising. The power transmission device according to claim 2 , further comprising a nonconductive portion that is disposed in front of the power transmission surface so as to face the power transmission surface and is made of a nonconductive material. The power transmission device according to claim 4 , wherein the first shielding unit is configured to be extendable and contractible in a direction along a direction perpendicular to the power transmission surface.

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