JP6289868B2 - Coil unit and power transmission system - Google Patents

Description

  The present invention relates to a technical field of a coil unit used for non-contact power transmission and a power transmission system including the coil unit.

  As this type of coil unit, for example, it has a magnetic core laminated on a base plate and a coil laminated on the magnetic core, and an electric insulating material is interposed between the base plate and the magnetic core, or A coil unit provided with an electrically insulating space has been proposed (see Patent Document 1).

  Or the coil unit which has a coil and the magnetic body arrange | positioned on the opposite side to the side which opposes the coil unit used as a pair of this coil is proposed. In particular, it is described that a plurality of rod-like magnetic bodies are arranged radially and in parallel to the coil as the magnetic body (see Patent Document 2).

JP 2010-93180 A JP 2010-239848 A

  In a power transmission system provided with this type of coil unit, the efficiency of power transmission is reduced due to a positional shift between the coil unit on the power feeding side and the coil unit on the power receiving side. However, when the power transmission system is used as a charging system for a battery mounted on a vehicle such as an electric vehicle, the accuracy of alignment of the coil unit greatly depends on the driving skill of the driver of the vehicle.

  In the above-described background art, there is a technical problem that no countermeasure is taken for the positional deviation between the coil units.

  The present invention has been made in view of the above-described problems, for example, and it is an object to provide a coil unit and a power transmission system that can suppress a decrease in power transmission efficiency due to a positional shift between the coil units. To do.

In order to solve the above problems, a first coil unit of the present invention is a coil unit that constitutes a part of a power transmission system capable of non-contact power transmission, and is formed on one plane. A planar coil and a plurality of rod-shaped magnetic members disposed on one side of the planar coil and including a magnetic body, wherein the plurality of rod-shaped magnetic members are configured to receive current in the planar coil. When flowing, in order to vary the magnetic flux density generated according to the orientation centered on the center of the planar coil on the one plane, the planar shape is viewed from above the planar coil. Radially from the center of the coil, the number of bar-shaped magnetic members in one direction is different from the number of bar-shaped magnetic members in the other direction .

In order to solve the above problems, a power transmission system according to the present invention is a power transmission system including a power feeding device and a power receiving device capable of contactless power transmission, and the power feeding device is formed on one plane. A plurality of rod-shaped first magnetic members disposed on the opposite side of the first planar coil opposite to the side facing the power receiving device of the first planar coil and each including a magnetic body; The power receiving device includes a second planar coil formed on another plane that is a plane along the one plane, and the power feeding device of the second planar coil. A power receiving coil unit that is disposed on a side opposite to the facing side and includes a plurality of rod-shaped second magnetic members each including a magnetic body, and the power feeding coil unit and the power receiving coil unit are disposed to face each other. If Of the first magnetic member, the number of the first magnetic member extending along one direction in the upper one plane, the first magnetic extending along the other direction intersecting the one direction The plurality of second magnetic members are arranged so as to be larger than the number of members, and the number of the second magnetic members extending along the one direction extends along the other direction. It arrange | positions so that it may exceed the number of the said 2nd magnetic members.

In order to solve the above problems, a second coil unit of the present invention is a coil unit that constitutes a part of a power transmission system capable of non-contact power transmission, and includes a planar coil and the planar coil. And a magnetic member including a magnetic body disposed on one side of the coil, and the magnetic member has a center at the top of the planar coil as viewed from above the planar coil. The first range and the second range are arranged in at least a part of each of the first range and the second range, which are fan-shaped ranges having a predetermined central angle, and the first range and the second range are planarly viewed from above the planar coil. As seen, it is set as an axis object with respect to an axis passing through the center of the planar coil.

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

It is a schematic block diagram which shows the structure of the coil unit which concerns on 1st Example. It is the top view which looked at the coil unit which concerns on 1st Example planarly on the baseplate. It is a characteristic view which shows an example of the relationship between the positional offset amount of the center of a primary side coil unit, and the center of a secondary side coil unit, and a coupling coefficient. It is a conceptual diagram when the coil unit which concerns on 1st Example is mounted in the vehicle. It is a block diagram which shows the structure of the electric power transmission system which concerns on 1st Example. It is the top view which looked at the coil unit which concerns on 2nd Example planarly on the baseplate. It is a flowchart which shows the drive control process of the magnetic member which concerns on 2nd Example. It is a figure which shows an example of the characteristic view which defines the relationship between the distance between coil centers, and the arrangement angle range of a magnetic member, and an example of the arrangement | sequence of a magnetic member.

  Embodiments according to the coil unit and the power transmission system of the present invention will be described.

(First coil unit)
The 1st coil unit which concerns on embodiment is a coil unit which comprises a part of electric power transmission system which can transmit electric power by non-contact. The coil unit includes a planar coil formed on one plane, and a magnetic member that is disposed on one side of the planar coil and includes a magnetic body.

  Here, in particular, the magnetic members are arranged so that the magnetic flux density generated differs according to the orientation centered on the center of the planar coil on one plane when a current flows through the planar coil.

  According to the first coil unit according to the embodiment, the coil unit includes a planar coil and a magnetic member disposed on one side of the planar coil. For the shape of the planar coil, various shapes such as a circle, an ellipse, a rectangle, and a triangle can be applied according to the specifications of the coil unit. The magnetic member is not limited to a single component, and may be configured to include a plurality of components.

  Here, according to the research of the present inventor, the following matters have been found. That is, when the magnetic member is uniformly arranged on one side of the planar coil (that is, when the magnetic flux density generated around the planar coil is uniform), the planar coil is in the planar shape. The power transmission efficiency is similarly reduced regardless of the direction of the coil disposed opposite to the coil. On the other hand, for example, a coil unit used in a system for charging a battery mounted on an electric vehicle in a contactless manner or the like is likely to cause a displacement in the left-right direction of the electric vehicle, for example. That is, depending on the use of an apparatus or system that includes a coil unit, the direction in which misalignment is likely to occur is limited.

  Therefore, in the present embodiment, as described above, when the current flows through the planar coil, the magnetic member generates a different magnetic flux density according to the orientation centered on the planar coil on one plane. Has been placed. If comprised in this way, the fall of the power transmission efficiency resulting from the position shift to the specific direction of the said coil unit can be suppressed.

  In one aspect of the first coil unit according to the embodiment, the coil unit includes a plurality of rod-shaped magnetic members as magnetic members. The plurality of rod-shaped magnetic members are planarly viewed from above the planar coil, radiate from the center of the planar coil, and the number of rod-shaped magnetic members in one orientation and the rod-shaped in the other orientation. The magnetic members are arranged so as to be different from each other.

  According to this aspect, the magnetic flux density generated when a current flows through the planar coil can be varied depending on the direction relatively easily.

  In this aspect, the plurality of rod-like magnetic members may be arranged on an axis with respect to an axis passing through the center of the planar coil when viewed from above the planar coil.

  If comprised in this way, the fall of the power transmission efficiency resulting from the position shift to the specific direction of the said coil unit can be suppressed suitably.

  In an aspect including a plurality of rod-like magnetic members, the coil unit is mounted on a vehicle, and the number of rod-like magnetic members extending along the front-rear direction of the vehicle extends along the left-right direction of the vehicle. There may be more than the number of the rod-shaped magnetic members to perform.

  If comprised in this way, the fall of the electric power transmission efficiency resulting from the position shift of the said coil unit to the left-right direction of the vehicle can be suppressed suitably.

  In another aspect of the first coil unit according to the embodiment, the coil unit further includes drive means capable of rotationally driving the magnetic member with respect to the center of the planar coil.

  According to this aspect, it is possible to change the direction in which the power transmission efficiency is unlikely to be reduced in accordance with the positional deviation of the coil unit, which is very advantageous in practice.

(Power transmission system)
The power transmission system according to the embodiment is a power transmission system including a power feeding device and a power receiving device capable of non-contact power transmission.

  The power feeding device is disposed on the opposite side of the first planar coil formed on one plane and the side opposite to the power receiving device of the first planar coil, and each includes a magnetic material. A plurality of first magnetic members.

  The power receiving device is disposed on the opposite side of the second planar coil formed on the other plane which is a plane along the one plane and the side facing the power feeding device of the second planar coil, Each of the power receiving coil units includes a plurality of rod-shaped second magnetic members each including a magnetic body.

  When the power feeding coil unit and the power receiving coil unit are arranged to face each other, the plurality of first magnetic materials are such that the number of first magnetic members extending along one direction on one plane intersects one direction. The plurality of second magnetic materials are arranged so that the number of second magnetic members extending along one direction is different from the number of first magnetic members extending along one direction. It arrange | positions so that it may become more than the number of the 2nd magnetic members extended along the azimuth | direction.

  According to the power transmission system according to the embodiment, it is possible to suppress a decrease in power transmission efficiency even when the power feeding coil unit is shifted to another direction with respect to the power receiving coil unit.

(Second coil unit)
The 2nd coil unit concerning an embodiment is a coil unit which constitutes a part of electric power transmission system in which electric power transmission is possible without contact. The coil unit includes a planar coil and a magnetic member disposed on one side of the planar coil and including a magnetic body.

  Here, in particular, the magnetic member is at least one of a first range and a second range, each of which is a fan-shaped range having the center of the planar coil as a top and a predetermined central angle when viewed in plan from above the planar coil. Arranged in part.

  According to the second coil unit according to the embodiment, the magnetic flux density generated when a current flows through the planar coil varies depending on the orientation from the center of the planar coil. As a result, it is possible to suppress a decrease in power transmission efficiency due to the positional deviation of the coil unit in a specific direction.

  In one aspect of the second coil unit according to the embodiment, the first range and the second range are axially viewed with respect to an axis passing through the center of the planar coil when viewed in plan from above the planar coil. Is set.

According to this aspect, it is possible to suitably suppress a decrease in power transmission efficiency due to a positional shift of the coil unit in a specific direction.

  An embodiment according to the coil unit of the present invention will be described with reference to the drawings.

<First embodiment>
A first embodiment according to the coil unit of the present invention will be described with reference to FIGS.

  The configuration of the coil unit according to the first embodiment will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram illustrating a configuration of a coil unit according to the first embodiment. FIG. 2 is a plan view of the coil unit according to the first embodiment when viewed in plan on the base plate.

  The coil unit 1 according to the embodiment is a coil unit used as a part of a power transmission unit or a power reception unit in a power transmission system capable of non-contact power transmission.

  1 and 2, the coil unit 1 includes a base plate 11, an insulating plate 12 stacked on the base plate 11, a plurality of magnetic members 13 arranged on the insulating plate 12, and the plurality of magnetic members. 13 and a coil 14 disposed on 13.

  The base plate 11 is made of a metal having a relatively low magnetic permeability such as aluminum. The presence of the base plate 11 ensures the strength of the casing (not shown) of the coil unit 1. Here, in particular, the base plate 11 prevents leakage of magnetic flux generated around the coil 14 to the outside due to eddy current generated inside the base plate 11 during operation of the coil unit 1.

  On the other hand, due to the eddy current generated inside the base plate 11, heat loss is generated and magnetic flux that weakens the magnetic flux generated around the coil 14 is generated. Therefore, in this embodiment, the insulating plate 12 suppresses reduction of heat loss and magnetic flux due to eddy current.

  The plurality of magnetic members 13 are made of a magnetic material such as ferrite, for example. Each magnetic member 13 is formed in a flat plate shape (or prismatic shape) in FIGS. 1 and 2, but may be formed in a cylindrical shape or the like, for example. As shown in FIG. 2, the plurality of magnetic members 13 are arranged radially from the center of the coil 14 on the insulating plate 12.

  Particularly in the present embodiment, the plurality of magnetic members 13 are arranged so that the magnetic flux density generated around the coil 14 during the operation of the coil unit 1 varies depending on the orientation centered on the center of the coil 14. More specifically, as shown in FIG. 2, the plurality of magnetic members 13 are arranged in fan-shaped ranges (i) and (ii) having the center of the coil 14 as a top and a predetermined central angle. .

  The coil 14 is a planar coil formed of, for example, a copper wire whose surface is insulated. The shape of the coil 14 is not limited to the circular shape shown in FIG.

  By the way, when this type of coil unit is used for non-contact power transmission, depending on the arrangement of the coil unit on the primary side (that is, the power transmission side) and the coil unit on the secondary side (that is, the power reception side). The efficiency related to power transmission changes.

  Specifically, the efficiency related to power transmission is such that the center of the primary coil unit and the center of the secondary coil unit coincide with each other in plan view so that the center of the primary coil unit and the secondary coil unit coincide with each other. The highest value is obtained when the unit is disposed opposite to the unit. On the other hand, as the distance between the center of the primary coil unit and the center of the secondary coil unit increases, the efficiency related to power transmission decreases.

  For example, when this type of coil unit is used in a system that performs non-contact power transmission to a vehicle such as an electric vehicle and charges the battery of the vehicle, the primary coil unit and the secondary coil unit The accuracy of alignment greatly depends on the driving skill of the vehicle driver.

  Here, misalignment between the primary side coil unit and the secondary side coil unit in the front-rear direction of the vehicle can be suppressed, for example, by installing a vehicle stop or the like. However, it is difficult to suppress displacement between the primary side coil unit and the secondary side coil unit in the left-right direction of the vehicle.

  In the coil unit 1 according to the present embodiment, a plurality of magnetic members 13 are biased and arranged on the insulating plate 12 (see FIGS. 1 and 2). If comprised in this way, even if it is a case where the position shift to the one direction (FIG. 2 Y direction) of a coil unit arises, the fall of the efficiency which concerns on electric power transmission can be suppressed.

  Here, the effect of the coil unit 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is a characteristic diagram showing an example of the relationship between the amount of positional deviation between the center of the primary coil unit and the center of the secondary coil unit and the coupling coefficient. In FIG. 3, “uniform radiation arrangement” means a state in which a plurality of magnetic members 13 are arranged without deviation (see, for example, FIG. 6A). The “aggregate arrangement” means a state in which the coil unit 1 according to the present embodiment is used for both the primary side coil unit and the secondary side coil unit.

  When the center of the primary side coil unit and the center of the secondary side coil unit are shifted in the Y-axis direction in FIG. 2, the coil unit 1 according to the present embodiment has a lower coupling coefficient than the uniform radiation arrangement. (In other words, a decrease in efficiency related to power transmission) is suppressed (see “aggregate arrangement (Y-axis deviation)” and “uniform radiation arrangement” in FIG. 3).

  On the other hand, when the center of the primary side coil unit and the center of the secondary side coil unit are shifted in the X-axis direction in FIG. 2, the coil unit 1 according to the present embodiment has a coupling coefficient compared to the uniform radiation arrangement. (Refer to “aggregate arrangement (X-axis misalignment)” and “uniform radiation arrangement” in FIG. 3).

  Therefore, if the coil unit 1 is installed as the vehicle-side coil and the ground-side coil in FIG. 4 so that the Y-axis direction in FIG. 2 of the coil unit 1 according to the present embodiment matches the left-right direction of the vehicle. Even if the primary side coil unit (here, the ground side coil) and the secondary side coil unit (here, the vehicle side coil) are displaced in the Y-axis direction, the efficiency related to power transmission is reduced. Can be suppressed.

  In addition, since the positional shift in the X-axis direction between the primary side coil unit and the secondary side coil unit is suppressed by the vehicle stop, the influence on the efficiency related to power transmission is extremely small.

  Next, a non-contact power transmission system including the coil unit 1 according to the present embodiment will be described with reference to FIG. FIG. 5 is a block diagram illustrating a configuration of the power transmission system according to the first embodiment.

  In FIG. 5, the power transmission system includes a power feeding device 100 and a power receiving device 200. When the power transmission system is used as a system for charging a battery mounted on the vehicle, the power receiving device 200 is mounted on the vehicle.

  The power supply apparatus 100 includes a high frequency power supply control apparatus 110 and a primary coil 1a having the same configuration as that of the coil unit 1 according to the embodiment. On the other hand, the power receiving device 200 includes a rectifier converter 210, a power storage device 220, and a secondary coil 1b having the same configuration as that of the coil unit 1 according to the embodiment.

  During operation of the power transmission system, the power output from the high frequency power supply control device 110 of the power supply device 100 is supplied to the power storage device 220 of the power receiving device 200 via the primary coil 1a, the secondary coil 1b, and the rectifier converter 210. Is done.

  It should be noted that various known aspects can be applied to the components other than the primary coil 1a and the secondary coil 1b in the power transmission system, and the control processing related to power transmission, and therefore the detailed description thereof is omitted. To do.

  Instead of the plurality of magnetic members 13, for example, a disk-shaped magnetic member, and a portion corresponding to a region where the plurality of magnetic members 13 are arranged in FIG. 2 is made of a magnetic material having a relatively high permeability. A magnetic member formed of a magnetic material having a relatively low permeability, or a disk-like magnetic member, the other part corresponding to a region where a plurality of magnetic members 13 are arranged in FIG. A magnetic member having a thickness greater than that of other portions may be used.

<Second embodiment>
A second embodiment according to the coil unit of the present invention will be described with reference to FIGS. The second embodiment is the same as the first embodiment except that the plurality of magnetic members 13 described above are movable. Therefore, repeated description is omitted as appropriate, and the same in the drawings. Parts are denoted by the same reference numerals, and fundamentally different points from the first embodiment will be described with reference to FIGS.

  The coil unit 2 according to the present embodiment has a plurality of magnetic members 13 at the center of the coil 14 on the distance sensor that measures the distance between the coil unit 2 and the paired coil unit, and the insulating plate 14. A drive unit (not shown) that can be driven to rotate is provided. The “driving unit” according to the present embodiment is an example of the “driving unit” according to the present invention.

  Specifically, for example, a concentric rail or groove centered on the center of the coil 14 is provided on the insulating plate 14, and the drive unit drives the plurality of magnetic members 13 along the rail or groove. It is configured to be possible.

  For this reason, the arrangement of the plurality of magnetic members 13 is changed from the state shown in FIG. 6A to the state shown in FIG. 6C by the state shown in FIG. For example, the state shown in FIG. 6C is changed to the state shown in FIG. 6A through the state shown in FIG. 6B.

  Here, the range in which the plurality of magnetic members 13 are arranged is determined in accordance with the distance between the center of the primary side coil unit and the center of the secondary side coil unit in plan view.

  Specifically, there is a displacement between the center of the primary coil unit and the center of the secondary coil unit, and the center of the primary coil unit and the center of the secondary coil unit The shorter the distance between them, the narrower the range in which the plurality of magnetic members 13 are arranged. In addition, when the position shift has not arisen, the some magnetic member 13 may be arranged how.

  Next, drive control processing of the plurality of magnetic members 13 will be described with reference to the flowchart of FIG. Here, a drive control process when the coil unit 2 is used in a system for charging a battery mounted on a vehicle in a non-contact manner will be described. The configuration of the entire system is the same as that of the power transmission system shown in FIG.

  In FIG. 7, the control unit of the power supply apparatus receives a vehicle stop signal transmitted from the vehicle by wireless communication (step S101). Here, the “vehicle stop signal” means a signal output when the vehicle is parked (for example, when the shift lever is set to the parking position).

  Next, a control part operates the distance sensor with which the coil unit 2 was equipped (step S102). Subsequently, the control unit acquires in which direction the center of the secondary coil unit is present, for example, with respect to the center of the primary coil unit, based on the output signal from the distance sensor (step S103). ) The distance between the center of the primary coil unit and the center of the secondary coil unit is acquired (step S104).

  Next, the control unit includes information (see FIG. 8A) for determining the distance between the centers of the coil units and the arrangement angle range of the magnetic members stored in advance in the memory of the control unit, and the acquired distance. Based on the above, the arrangement angle range of the plurality of magnetic members 13 is determined. The control unit further determines the azimuth of the axis a shown in FIG. 8B based on the acquired direction (step S105).

  Next, the control unit controls the drive unit to drive the plurality of magnetic members 13 based on the determined array angle range and orientation (step S106). Specifically, for example, when the acquired distance and direction are the points surrounded by the dotted circle c in FIG. 8A, the control unit sets the array angle range to the angle B and the axis a The azimuth is determined as the azimuth from the center of the circle in FIG. 8A toward the point surrounded by the dotted circle c. As a result, as shown in FIG. 8C, the plurality of magnetic members 13 are arranged so as to be symmetric with respect to the axis a.

  After the process of step S107, the control unit transmits a charge preparation signal to the vehicle via wireless communication (step S108).

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification. A power transmission system is also included in the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 1, 2 ... Coil unit, 11 ... Base plate, 12 ... Insulating plate, 13 ... Magnetic member, 14 ... Coil, 100 ... Power feeding apparatus, 200 ... Power receiving apparatus

Claims (6)

A coil unit constituting a part of a power transmission system capable of non-contact power transmission,
A planar coil formed on one plane;
A plurality of rod-shaped magnetic members disposed on one side of the planar coil and including a magnetic body;
With
In order to vary the magnetic flux density generated according to the orientation centered on the center of the planar coil on the one plane when the current flows through the planar coil, the plurality of rod-shaped magnetic members , When viewed in plan from above the planar coil, the number of rod-shaped magnetic members in one direction radially from the center of the planar coil and the number of rod-shaped magnetic members in the other direction are mutually Coil unit characterized by being arranged differently . Wherein the plurality of rod-like magnetic member, in plan view from above of the planar coil, in claim 1, characterized in that it is arranged axial-symmetrically with respect to the axis passing through the center of the planar coil The coil unit described. The coil unit is mounted on the vehicle,
The number of the extending bar-shaped magnetic member along the longitudinal direction of the vehicle, according to claim 1 or 2, characterized in that more than the number of rod-like magnetic member extending along the lateral direction of the vehicle Coil unit. 2. The coil unit according to claim 1, further comprising drive means capable of rotationally driving the plurality of rod-shaped magnetic members with respect to a center of the planar coil. A power transmission system including a power feeding device and a power receiving device capable of non-contact power transmission,
The power feeding device is disposed on the opposite side of the first planar coil formed on one plane and the side facing the power receiving device of the first planar coil, and each includes a magnetic body. A plurality of rod-shaped first magnetic members, and a feeding coil unit having
The power receiving device is provided on a side opposite to the second planar coil formed on another plane that is a plane along the one plane and the side facing the power feeding device of the second planar coil. A plurality of rod-shaped second magnetic members disposed and each including a magnetic body, and a power receiving coil unit,
When the power feeding coil unit and the power receiving coil unit are arranged to face each other, the plurality of first magnetic members has the number of the first magnetic members extending along one direction on the one plane, Arranged to be larger than the number of the first magnetic members extending along another direction intersecting with one direction, and the plurality of second magnetic members extend along the one direction. The power transmission system, wherein the number of the second magnetic members is arranged to be larger than the number of the second magnetic members extending along the other direction. A coil unit constituting a part of a power transmission system capable of non-contact power transmission,
A planar coil;
A magnetic member disposed on one side of the planar coil and comprising a magnetic material;
With
The magnetic member is at least one of a first range and a second range, each of which is a fan-shaped range having the center of the planar coil as a top and a predetermined central angle when viewed in plan from above the planar coil. Is placed in the
The coil unit, wherein the first range and the second range are set as axial objects with respect to an axis passing through a center of the planar coil as viewed in plan from above the planar coil. .

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