JP5605297B2 - Non-contact power feeding device - Google Patents

Description

  The present invention relates to a non-contact power feeding device that feeds power from an external power source to a battery of a vehicle in a non-contact manner.

  An electric vehicle such as an electric vehicle and a hybrid vehicle is equipped with a battery that can charge electric power for traveling from an external power source. Known methods for supplying power for charging include a plug-in type power supply device that connects a power supply port on the power supply side and a vehicle charging port with a cable, and a non-contact type power supply device that does not use a cable. .

  In the technique related to the non-contact power feeding device described in Patent Document 1, a primary side coil (hereinafter referred to as “hereinafter referred to as“ the primary side coil ”) is interposed between the primary side coil installed outside and the secondary side coil installed in the lower part of the vehicle body via an electromagnetic field. Electric power is transmitted from a “facility side coil” to a secondary side coil (hereinafter also referred to as “vehicle body side coil”). As a result, the vehicle body side coil receives power from the opposing equipment side coil when a current flows by electromagnetic coupling.

  In the technique described in Patent Document 1, the equipment side coil and the vehicle body side coil have a structure in which a coil is wound around a core. In this coil configuration, the coil width can be increased with the same physique compared to the configuration in which the coil is formed in a spiral shape on the surface of the core. When the coil width is increased, the magnetic coupling between the equipment-side coil and the vehicle body-side coil becomes stronger and stronger against positional deviation.

JP 2010-172084 A

  In the technique described in Patent Document 1, the installation side coil is directly connected to the vehicle body side coil without interlinking with the air gap between the installation side coil and the vehicle body side coil out of the magnetic flux flowing from the installation side coil. There are many leakage flux paths that return to Since there are many such leakage flux paths, there is a problem that the magnetic flux cannot be effectively used.

  Therefore, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a non-contact power feeding device that can suppress generation of leakage magnetic flux and improve power feeding efficiency.

  The present invention employs the following technical means in order to achieve the aforementioned object.

The inventions of claim 1, a non-contact power feeding device which performs transmission in a non-contact from the primary coil (40) to the secondary side coil (50) (10),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
Both cores are arranged so that the surfaces on one side in the thickness direction face each other,
A part of the winding disposed on the opposing surface (41a) on the secondary core side in the primary side core is overlapped and wound, and a part of the overlapped uppermost layer winding (42a) is the other. It is a non-contact electric power feeder characterized by being located in the secondary coil side rather than the part (42b).

  According to the first aspect of the present invention, at least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core, and both cores face each other in the thickness direction. Are arranged as follows. Since the winding is located on the surface in the thickness direction, the coil width can be increased with the same physique as compared with the configuration in which the coil is formed in a spiral shape on the surface of the core. If the coil width is increased, the magnetic coupling between the primary side coil and the secondary side coil becomes stronger. Therefore, even if the positions of the primary side coil and the secondary side coil are slightly shifted, power transmission is performed. Can do.

Of the windings disposed on the opposing surface of the primary side core, a part of the windings disposed on the opposing surface is wound in an overlapping manner. A part of the superposed uppermost layer is located closer to the secondary coil than the other part. Since a part of the winding is located on the secondary coil side, a magnetic flux path that surrounds the winding located on the opposing surface and becomes convex toward the secondary coil when a current is passed through the primary coil. Can be made. The convex magnetic flux path has a smaller distance from the secondary coil than the other part, and a part of the convex magnetic flux path is inclined toward the secondary coil. Reaches the magnetic flux path for power transmission. Therefore, a part of the leakage magnetic flux can be mixed with the magnetic flux path formed by the primary side coil and the secondary side coil. As a result, the leakage magnetic flux can be reduced. Therefore, more magnetic flux generated in the primary coil can be used for power transmission. As described above, according to the present invention, it is possible to realize a non-contact power feeding device that can suppress generation of leakage magnetic flux and improve power feeding efficiency.

Further inventions as recited in claim 2, a non-contact power feeding device which performs transmission in a non-contact from the primary coil (40) to the secondary side coil (50) (10),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
Both cores are arranged so that the surfaces on one side in the thickness direction face each other.
Facing surface of the secondary core side of the primary core (41a) is Ri Na curved to be convex toward the secondary core,
Of the windings are disposed on opposite surfaces, a non-contact power feeding device characterized by a portion of the winding (42a) is positioned on the secondary coil side than the other portion (42b).

According to the invention described in claim 2 , the facing surface is curved so as to be convex toward the secondary side core. When the winding is wound around such an opposing surface, the winding can be arranged in a convex shape. As a result, a magnetic flux path that protrudes toward the secondary coil can be formed in the primary coil. Therefore, the effect of reducing the leakage magnetic flux similar to the above can be achieved.

Further inventions as recited in claim 3, a contactless power supply apparatus that performs transmission without contact from a primary side coil (40) to the secondary side coil (50) (10),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
Both cores are arranged so that the surfaces on one side in the thickness direction face each other,
The opposing surface (41a) on the secondary core side of the primary core has a convex portion (80) that is convex toward the secondary core,
The winding is wound around the tip of the convex part,
Of the windings arranged on the opposing surface, a part of the winding arranged at the tip of the convex part is located on the secondary coil side with respect to the other part, and the non-contact power feeding device It is .

According to the third aspect of the present invention, among the windings arranged on the opposing surface, a part of the winding arranged at the tip of the convex portion of the opposing surface is more secondary than the other part. Located on the coil side. Since the winding is wound around the tip of the convex portion, a magnetic flux path that is convex toward the secondary side coil can be formed in the primary side coil. As a result, the same effect of reducing the leakage magnetic flux as described above can be achieved.

Further inventions as recited in claim 4, a non-contact power feeding device which performs transmission in a non-contact from the primary coil (40) to the secondary side coil (50) (10),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
Both cores are arranged so that the surfaces on one side in the thickness direction face each other,
Made of a non-metal, some of the opposing surfaces of the secondary core side (41a) in the primary side core, the spacer extending toward the secondary core (70) is provided,
The winding is wound around the tip of the spacer,
A non-contact power feeding device characterized in that, of the windings arranged on the opposite surface, a part of the winding arranged at the tip of the spacer is positioned on the secondary coil side with respect to the other part. There is .

According to the fourth aspect of the present invention, of the windings arranged on the opposing surface, a part of the winding arranged at the tip of the spacer provided on the opposing surface is more secondary than the other part. Located on the coil side. Since the winding is wound around the tip of the spacer, a magnetic flux path that protrudes toward the secondary coil can be formed in the primary coil. As a result, the same effect of reducing the leakage magnetic flux as described above can be achieved. Further, since the magnetic flux path is not formed inside the non-metallic spacer, it is possible to prevent the leakage magnetic flux path from being formed inside the spacer.

Further inventions as recited in claim 5, a non-contact power feeding device which performs transmission in a non-contact from the primary coil (40) to the secondary side coil (50) (10),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
Both cores are arranged so that the surfaces on one side in the thickness direction face each other,
The windings disposed on the opposing surface (41a) on the secondary core side of the primary core are arranged in a direction that intersects the direction in which the winding extends on the opposing surface and along the opposing surface. Has been
A part of the winding positioned on the secondary coil side is a non-contact power feeding device that is positioned in the center in the direction in which the primary core is arranged.

According to the invention described in claim 5 , the windings disposed on the facing surface are arranged in a direction intersecting with the direction in which the winding extends on the facing surface and along the facing surface. . By arranging in this way, the coil width can be increased with the same winding length. Therefore, the magnetic coupling between the primary side coil and the secondary side coil can be strengthened, and power can be transmitted even when the positions of the primary side coil and the secondary side coil are slightly shifted.

  A part of the winding located on the secondary coil side is located in the center in the arrangement direction in the primary core. As a result, a magnetic flux path having a convex center can be formed. By making the center convex, convex vertices can be brought closer to both ends of the secondary coil. Therefore, more of the leakage magnetic flux can be interlaced with the magnetic flux path formed by the primary side coil and the secondary side coil. As a result, the leakage magnetic flux can be further reduced.

Further inventions as recited in claim 6, a contactless power supply apparatus that performs transmission without contact from a primary side coil (40) to the secondary side coil (50) (10),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
Both cores are arranged so that the surfaces on one side in the thickness direction face each other,
At both ends in the width direction of the primary side core, primary side projecting portions (43) that protrude toward the secondary side core are formed, and windings are provided on portions other than the tip of the primary side projecting portion. Is wound to constitute a part of the primary coil,
Secondary side protrusions (53) that protrude toward the primary side core are formed at both ends in the width direction of the secondary side core. A winding is wound around the side protrusion to form a secondary coil,
The primary side protruding part and the secondary side protruding part are arranged to face each other,
A part (42a) of the winding disposed on the opposing surface (41a) on the secondary core side in the primary side core is wound in an overlapped manner, and a part of the superimposed uppermost layer winding is another part. It is a non-contact electric power feeder characterized by being located in the secondary coil side rather than the part (42b) .

According to the sixth aspect of the present invention, the primary side projecting portion and the secondary side projecting portion that protrude toward the opposing core are provided at both ends in the width direction of the primary side core and the secondary side core. Each is formed, and a winding is wound around the primary side protrusion and the secondary side protrusion, and a part of the primary side coil and the secondary side coil are configured. Therefore, for example, the cross-sectional shapes of the primary side core and the secondary side core are U-shaped, and both end portions thereof correspond to the primary side protruding portion and the secondary side protruding portion. In addition, since the winding is wound around the tip portion of each projecting portion, both opposing ends serve as a magnetic flux path. In addition, a part of the winding disposed on the facing surface is wound in an overlapping manner. A part of the superposed winding of the uppermost layer is located closer to the secondary coil than the other part. Therefore, as described above, a magnetic flux path that is convex toward the secondary coil can be formed in the primary coil. As a result, the same effect of reducing the leakage magnetic flux as described above can be achieved.

Further inventions as recited in claim 7, the winding being disposed on the rear surface is a surface opposite to the facing surface of the primary core (41b) has a feature that it is arranged not to overlap To do.

According to the seventh aspect of the present invention, the windings disposed on the back surface of the primary side core are arranged without overlapping. By arranging the windings without overlapping as in the present invention, the thickness of the primary core can be reduced.

Further inventions as recited in claim 8, provided on the back is a surface opposite to the facing surface of the primary core, suppressing inhibiting unit leakage of magnetic field from the windings situated at the back to the outside (60 ) Is further included.

According to the invention described in claim 8 , the leakage of the magnetic field to the outside can be prevented by providing the suppressing portion on the back surface. As a result, the leakage magnetic flux can be reduced.

  In addition, the code | symbol in the bracket | parenthesis of each above-mentioned means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

It is a block diagram which shows the non-contact electric power feeding system 10 of 2nd Embodiment. 3 is a plan view showing a power transmission coil 40. FIG. 3 is a side view showing a power transmission coil 40 and a power reception coil 50. FIG. It is sectional drawing which looked at the power transmission coil 40 and the receiving coil 50 from the side surface. It is sectional drawing which looked at the coil 40 and the coil 50 of the comparative example from the side surface. It is sectional drawing which looked at the coils 40A and 50A of 2nd Embodiment from the side surface. It is sectional drawing which looked at the coils 40B and 50B of 3rd Embodiment from the side surface. It is sectional drawing which looked at the coils 40C and 50C of 4th Embodiment from the side surface. It is sectional drawing which looked at the coils 40D and 50D of 5th Embodiment from the side surface. It is sectional drawing which looked at the coils 40E and 50E of 6th Embodiment from the side surface. It is sectional drawing which looked at the coils 40F and 50F of 7th Embodiment from the side surface. It is sectional drawing which looked at the coils 40G and 50G of 8th Embodiment from the side surface. It is sectional drawing which looked at the coils 40H and 50H of 9th Embodiment from the side surface. It is sectional drawing which looked at the coils 40I and 50I of 10th Embodiment from the side surface.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. In some embodiments, portions corresponding to the matters described in the preceding embodiments are denoted by the same reference numerals, and redundant descriptions may be omitted. In addition, when a part of the configuration is described in each embodiment, the other parts of the configuration are the same as those of the embodiment described in advance. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination does not hinder the combination.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram illustrating an electrical configuration of a contactless power feeding system 10 according to the first embodiment. FIG. 2 is a plan view showing the power transmission coil 40. FIG. 3 is a side view showing the power transmission coil 40 and the power reception coil 50. The non-contact power supply system 10 can be applied when charging a main battery such as an electric vehicle and a plug-in hybrid vehicle. The non-contact power supply system 10 is a system that transmits power by a non-contact electromagnetic induction method between a main battery 21 that is a secondary battery and an external power supply 30 that is installed outside the vehicle 22. The electromagnetic induction method is a method of sending electric power using an induced magnetic flux generated between the power transmission side and the power reception side. The non-contact power feeding system 10 includes a power receiving circuit 23 and a vehicle side pad 24 mounted on the vehicle 22, and a power transmission circuit 31 and a ground side pad 32 installed outside the vehicle 22. The ground side pad 32 and the vehicle side pad 24 are collectively referred to as a non-contact power feeding device.

  First, the power transmission circuit 31 will be described. The power transmission circuit 31 is provided in, for example, homes, apartment houses, parking facilities such as coin parking, commercial facilities, and public facilities. The power transmission circuit 31 is connected to an external power supply 30 and a power transmission coil 40 that are external to the vehicle 22. The external power supply 30 is a system power supply, for example. The power transmission circuit 31 operates when power is supplied to the power receiving coil 50 of the vehicle 22. The power transmission circuit 31 transmits power from the external power supply 30 to the vehicle 22. Although not shown, the power transmission circuit 31 includes a control unit, a rectifier circuit, a high-frequency conversion circuit, a communication circuit, and a resonance circuit.

  The control unit controls each unit of the power transmission circuit 31, and controls the start and stop of power transmission. The high frequency conversion circuit converts the power supplied from the external power supply 30 into high frequency power and supplies it to the resonance circuit. In order to transmit power efficiently, the resonance circuit converts the voltage and current of the power applied from the high-frequency conversion circuit so as to coincide with each other, and supplies it to the ground side pad 32. The communication circuit is controlled by the control unit, communicates with the power receiving circuit 23, and gives the communicated information to the control unit.

  Next, the ground side pad 32 will be described. The ground side pad 32 has a power transmission coil (primary side coil) 40 that transmits electric power in a non-contact manner, and is provided so as to be exposed to the ground. The outer surface of the ground pad 32 covers the power transmission coil 40 and is partially exposed to the ground.

  The power transmission coil 40 is built in the ground side pad 32. The power transmission coil 40 is installed or embedded in a parking space defined in the parking facility together with the ground side pad 32, and is configured to generate an electromagnetic field by a predetermined energization. The power transmission coil 40 transfers power in a non-contact manner with the power reception coil 50 provided on the vehicle 22 side. The power transmission coil 40 is connected to the power transmission circuit 31 and transmits high-frequency power supplied from the power transmission circuit 31 to the vehicle 22 on which the power reception coil 50 is mounted by electromagnetic induction.

  Next, the vehicle side pad 24 will be described. The vehicle-side pad 24 has a power receiving coil (secondary coil) 50 that receives power in a non-contact manner, and is provided on the vehicle 22 so as to be exposed to the outside of the vehicle.

  The power receiving coil 50 is built in the vehicle side pad 24. The power receiving coil 50 transfers power in a non-contact manner with the power transmitting coil 40. The power receiving coil 50 generates an electromagnetic field in the power receiving coil 50 due to the influence of the electromagnetic field generated by the power transmitting coil 40, and a current flows through the power receiving coil 50 to generate a voltage. The power receiving coil 50 is connected to the power receiving circuit 23 and supplies the generated high frequency power to the power receiving circuit 23.

  Next, the power receiving circuit 23 will be described. The power receiving circuit 23 is a circuit that operates when charging power supplied from the external power supply 30 in the vehicle 22. The power receiving circuit 23 outputs the power supplied from the power receiving coil 50 built in the vehicle side pad 24 as a DC voltage, and charges the main battery 21. Although not shown, the power receiving circuit 23 includes a resonance circuit, a communication circuit, a rectifier circuit, and a booster circuit.

  In order to transmit power efficiently, the resonance circuit converts the voltage and current of the power supplied from the power receiving coil 50 so as to coincide with each other, and supplies the same to the rectifier circuit. The rectifier circuit is composed of a diode and a capacitor. The rectifier circuit rectifies the high-frequency power supplied from the resonance circuit with a diode, smoothes it with a capacitor, and then supplies it to the booster circuit. The booster circuit boosts the voltage of the electric power from the rectifier circuit to a predetermined voltage, for example, the maximum, and supplies it to the main battery 21 mounted on the vehicle 22. The communication circuit is controlled by the vehicle control device 25, communicates with the power transmission circuit 31, and gives the communicated information to the vehicle control device 25.

  Next, other configurations mounted on the vehicle 22 will be described. The vehicle 22 includes a main battery 21, an inverter 26, a motor generator (MG) 27, a DC / DC converter 28, an auxiliary machine 29a, an auxiliary battery 29b, and a vehicle control device 25. In the vehicle 22, a load such as a motor generator 27 is driven based on the electric power of the main battery 21. Further, on the basis of the electric power of the auxiliary battery 29b, auxiliary machines 29a such as a vehicle control device 25, an air conditioning unit (not shown) and an electric power steering unit (not shown) are driven.

  The main battery 21 is a high voltage battery, and is set so that its terminal voltage becomes high voltage. The main battery 21 is a battery configured to be chargeable / dischargeable. For example, a nickel metal hydride battery or a lithium ion battery can be used.

  The auxiliary battery 29 b is a low voltage battery whose terminal voltage is lower than that of the main battery 21. The auxiliary battery 29b uses the main battery 21 as a power supply source. The voltage of the main battery 21 is lowered by the DC / DC converter 28, and the lowered output voltage is applied.

  Inverter 26 is a power converter that converts power form and adjusts the amount of power between main battery 21 and motor generator 27. Inverter 26 converts the DC power of main battery 21 into AC power (DC / AC conversion) and adjusts the amount of power required for motor generator 27. Further, the inverter 26 converts the AC regenerative power into DC power when the motor generator 27 is rotationally driven by the driving force from the driving wheels of the vehicle 22 during deceleration to obtain AC regenerative power ( (AC / DC conversion) and supplied to the main battery 21 for charging. Thus, the inverter 26 enables bidirectional power conversion.

  The motor generator 27 is a three-phase AC rotating electric machine having both functions of an electric motor and a generator. One end of the rotating shaft of the motor generator 27 is directly connected to the output shaft of the internal combustion engine (not shown), and the other end is mechanically connected to the drive wheels via a transmission (not shown). It is connected to. The motor generator 27 functions as an electric motor that provides the driving force required for the driving wheels by controlling the rotational speed and the driving torque when the electric power converted and adjusted by the inverter 26 is supplied. Further, the motor generator 27 functions as a generator that generates AC regenerative electric power when it is rotationally driven by the driving force from the driving wheels during deceleration. The operation of the motor generator 27 is controlled by the vehicle control device 25.

  The vehicle control device 25 communicates with the power transmission circuit 31 via the power reception circuit 23 to control the operation of the power reception circuit 23 while grasping the operation of the power transmission circuit 31. The vehicle control device 25 uses the auxiliary battery 29b as a direct power source.

  Next, the configuration of the power transmission coil 40 and the power reception coil 50 will be described. First, the power receiving coil 50 will be described. The power receiving coil 50 includes a plate-shaped power receiving core (secondary core) 51 and a power receiving coil 52 wound around the power receiving core 51. The power receiving core 51 is formed in a flat plate shape in the present embodiment. The power receiving core 51 is made of a material having high magnetic permeability, and is formed of ferrite, for example. The power receiving winding 52 is made of a material with low electrical resistance, and for example, a litz wire is used.

  The power receiving winding 52 is disposed on both surfaces of the power receiving core 51 in the thickness direction. In other words, the winding axis of the wound power receiving winding 52 extends in a direction that is substantially orthogonal to the thickness direction of the power receiving core 51 (substantially orthogonal includes orthogonal). Further, the plurality of power receiving windings 52 arranged on both surfaces in the thickness direction of the power receiving core 51 are arranged in a direction intersecting with the direction in which the power receiving winding 52 extends (the thickness direction of the paper in FIG. 3). Are arranged in a direction along the surface (left and right direction in FIG. 3). The power receiving windings 52 are arranged in one row as shown in FIG. The end of the power receiving winding 52 is connected to the power receiving circuit 23.

  Next, the power transmission coil 40 will be described. The power transmission coil 40 includes a plate-shaped power transmission core (primary core) 41 and a power transmission winding 42 wound around the power transmission core 41. The power transmission core 41 is formed in a flat plate shape in the present embodiment. The power transmission core 41 is made of a material having high magnetic permeability, and is formed of, for example, ferrite. The power transmission winding 42 is made of a material having low electrical resistance, and for example, a litz wire is used.

  The power transmission winding 42 is disposed on both surfaces of the power transmission core 41 in the thickness direction. In other words, the winding axis of the wound winding for power transmission 42 extends in a direction substantially orthogonal to the thickness direction of the power transmission core 41 (substantially orthogonal includes orthogonal). The power transmission winding 42 is connected to the power transmission circuit 31.

  As shown in FIG. 3, the power receiving core 51 and the power transmission core 41 are arranged so that one surface in the thickness direction, which is one surface in the thickness direction, faces each other, as shown in FIG. 3. In other words, when power is transmitted, the power receiving core 51 and the power transmission core 41 are arranged so that one surface in the thickness direction faces each other.

  Of the both surfaces in the thickness direction of the power transmission core 41, the surface facing the power receiving core 51 is referred to as a facing surface 41a, and the other surface is referred to as a back surface 41b. Therefore, the opposing surface 41a is a surface located above in FIG. 3, and the back surface 41b is a surface located below in FIG. As shown in FIG. 3, the power transmission winding 42 of a portion 42 a of the power transmission winding 42 disposed on the facing surface 41 a is overlapped and wound, and the superimposed uppermost power transmission winding is formed. A portion 42 a of 42 is located closer to the power receiving coil 50 than the other portion 42 b of the power transmission winding 42. In the present embodiment, it is partially overlapped in triplicate. In other words, as shown in FIG. 2, a portion 42a of the power transmission winding 42 is wound in the thickness direction, not in the width direction. A portion 42a of the power transmission winding 42 located on the power receiving coil 50 side is located at the center in the width direction of the power transmission core 41 (the left-right direction in the drawing of FIG. 3). Here, the center is a portion having a certain width including the center in the width direction.

  In addition, a part of the power transmission winding 42 disposed on the back surface 41 b of the power transmission core 41 is also superimposed and wound. In the present embodiment, the power transmission winding 42 is partially overlapped on the back surface 41b. Further, the power transmission windings 42 other than the part 42a of the power transmission winding 42 to be superimposed are in the direction intersecting with the direction in which the windings extend (the thickness direction of the paper surface of FIG. 3), and along the arranged surface. They are arranged in such a direction (left and right direction in FIG. 3). The non-superimposed power transmission windings 42 are arranged in one row.

  FIG. 4 is a cross-sectional view of the power transmission coil 40 and the power reception coil 50 as viewed from the side. FIG. 5 is a cross-sectional view of the power transmission coil 40 and the power reception coil 50 of the comparative example viewed from the side. The configurations of the power transmission coil 40 and the power reception coil 50 of the comparative example are different in the winding portion where the power transmission coil 40 is superimposed, and the remaining configurations are the same. In FIGS. 4 and 5, the magnetic flux path is indicated by broken lines.

  As shown in FIG. 4, among the power transmission windings 42 disposed on the facing surface 41a, a part 42a is located closer to the power receiving coil 50 than the other part 42b. Since some of the power transmission windings 42 are located on the power receiving coil 50 side, as shown in FIG. 4, when a current is passed through the power transmission coil 40, the power transmission winding 42 positioned on the opposing surface 41 a is enclosed. A magnetic flux path that is convex toward 50 can be created. The convex magnetic flux path has a smaller distance from the power receiving coil 50 than the other portions, and a part of the convex magnetic flux path is inclined toward the power receiving coil 50, so that part of the magnetic flux is transmitted. To reach the magnetic flux path.

  On the other hand, in the comparative example shown in FIG. 5, the power transmission windings 42 arranged on the facing surface 41a are arranged in a line, so that the magnetic flux path formed surrounding the power transmission winding 42 is flat. is there. Therefore, the magnetic flux passing through the flat magnetic flux path becomes a leakage magnetic flux and cannot contribute to power transmission.

  In the present embodiment, a part of the leakage magnetic flux that could not be used in the comparative example can be mixed with the magnetic flux path formed by the power transmission coil 40 and the power reception coil 50. In FIG. 4, a portion where magnetic fluxes are mixed and the magnetic flux density is increased is surrounded by a virtual line. Thereby, in this embodiment, a leakage magnetic flux can be decreased rather than a comparative example.

  The height h of the power transmission winding 42 to be superimposed is set in relation to the distance t between the power transmission core 41 and the power reception core 51. This is because if the ratio of the interval t to the height dimension h (interval t / height dimension h) is too large, the interval becomes wider and the magnetic fluxes that are intermingled are reduced. The interval t is preferably set to 9 times or less of the height dimension h, for example.

  The width dimension W of the power transmission winding 42 is set in relation to the interval t. This is because if the ratio of the spacing t to the width dimension W (spacing t / width dimension W) is too large, the spacing becomes wider and the magnetic fluxes that are intermingled are reduced. The interval t is preferably set to 3 times or less of the width dimension W, for example.

  As described above, in the contactless power supply system 10 of the present embodiment, the windings 42 and 52 of the coils 40 and 50 are arranged on both surfaces of the cores 41 and 51 in the thickness direction. The surfaces on one side in the thickness direction of 51 are arranged so as to face each other. Since the windings 42 and 52 are positioned on the surface in the thickness direction, the coil width can be increased with the same physique as compared with the configuration in which the coils are formed in a spiral shape on the surfaces of the cores 41 and 51. . When the coil width is increased, the magnetic coupling between the power transmission coil 40 and the power reception coil 50 is strengthened, so that power transmission can be performed even when the positions of the power transmission coil 40 and the power reception coil 50 are slightly shifted.

  As described with reference to FIGS. 4 and 5, a part of the leakage magnetic flux can be mixed with the magnetic flux path formed by the power transmission coil 40 and the power reception coil 50. As a result, the leakage magnetic flux can be reduced. Therefore, more magnetic flux generated in the power transmission coil 40 can be used for power transmission. Thus, the non-contact electric power feeding system 10 which can suppress generation | occurrence | production of a magnetic flux leakage and can improve electric power feeding efficiency is realizable.

  Further, in the present embodiment, the power transmission winding 42 disposed on the facing surface 41a is a direction that intersects the direction in which the power transmission winding 42 extends on the facing surface 41a and that extends along the facing surface 41a. They are densely arranged so as to be in contact with adjacent power transmission windings 42. By arranging in this way, the coil width can be increased with the same winding length. Therefore, the magnetic coupling between the power transmission coil 40 and the power reception coil 50 can be strengthened, and power can be transmitted even when the positions are slightly shifted from each other. Further, by arranging the power transmission windings 42 densely, it is possible to prevent the magnetic flux from leaking between the adjacent power transmission windings 42 rather than sparsely arranging them.

  Further, a part 42 a of the power transmission winding 42 located on the facing surface 41 a is located in the center of the arrangement direction in the power transmission core 41. As a result, a magnetic flux path having a convex center can be formed. By making the center convex, it is possible to bring the convex vertex closer to both widthwise ends of the power receiving coil 50. Therefore, more of the leakage magnetic flux can be mixed with the magnetic flux path formed by the power transmission coil 40 and the power reception coil 50. As a result, the leakage magnetic flux can be further reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view of the power transmission coil 40A and the power reception coil 50A of the second embodiment as viewed from the side. In FIG. 6, the magnetic flux path is shown using broken lines. In the present embodiment, the conductive plate 60 is disposed on the back surface 41b of the power transmission coil 40A and the surface on the opposite side of the power reception coil 50A (upper surface in FIG. 6) with respect to the first embodiment in order to reduce the leakage magnetic flux. It has the feature in the point.

  The conductive plate 60 is provided on the back surface 41b of the power transmission core 41 and has a function as a suppressing unit that suppresses leakage of a magnetic field from the power transmission winding 42 located on the back surface 41b to the outside. The conductive plate 60 is made of, for example, aluminum (Al), copper, iron, silver, or the like. The conductive plate 60 is formed with a recess 60a for accommodating the windings 42 and 52 and is in contact with the windings 42.52. The conductive plate 60 is disposed so as to cover all of the back surface 41b of the power transmission coil 40A and the opposite surface of the power reception coil 50A. As a result, the conductive plate 60 suppresses the magnetic flux toward the outside. Therefore, the magnetic flux circulating between the power transmission coil 40A and the power reception coil 50A increases, and the coupling coefficient can be increased.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view of the power transmission coil 40B and the power reception coil 50B of the third embodiment as viewed from the side. In FIG. 7, the magnetic flux path is shown using broken lines. The present embodiment is different from the first embodiment described above in that the power transmission windings 42 arranged on the back surface 41b of the power transmission core 41 are arranged without overlapping. The power transmission coil 40B can be made thin by arranging the power transmission windings 42 in one row without overlapping as in the present embodiment.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a cross-sectional view of the power transmission coil 40C and the power reception coil 50C of the fourth embodiment as viewed from the side. In FIG. 8, the magnetic flux path is shown using a broken line. The present embodiment is characterized in that the power transmission winding 42 is wound through a spacer 70 made of nonmetal.

  The spacer 70 is made of a nonmetal, is provided on a part of the facing surface 41 a of the power transmission core 41, and functions as a spacer that extends toward the power reception core 51. The spacer 70 is made of a non-metallic material, for example, resin and wood. As shown in FIG. 8, one power transmission winding 42 is wound around the tip of the spacer 70. Among the power transmission windings 42 disposed on the opposing surface 41a of the power transmission core 41, a part 42a of the power transmission winding 42 disposed on the spacer 70 is positioned closer to the power receiving coil 50C than the other part 42b. ing.

  As a result, among the power transmission windings 42 disposed on the facing surface 41a, a portion 42a of the power transmission winding 42 disposed at the tip of the spacer 70 provided on the facing surface 41a receives power more than the other portions 42b. It can be located on the coil 50C side. Since the power transmission winding 42 is wound around the tip of the spacer 70, a magnetic flux path that protrudes toward the power receiving coil 50C can be formed in the power transmitting coil 40C. As a result, the same effect of reducing the leakage magnetic flux as described above can be achieved. In addition, since the magnetic flux path is not formed inside the spacer 70 because it is made of a non-metal, it is possible to prevent the leakage magnetic flux path from being formed inside the spacer 70. Furthermore, by adjusting the length dimension of the spacer 70 (the vertical dimension in FIG. 8), the position of the power transmission winding 42 positioned closest to the power receiving coil 50C can be adjusted. Therefore, by adjusting the length dimension of the spacer 70, it can be easily set so as to have the optimum power transmission efficiency.

  The dimension in the width direction at the tip of the spacer 70 is not limited to the dimension in which one power transmission winding 42 is disposed, and may be a dimension in which a plurality of power transmission windings 42 are disposed.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view of the power transmission coil 40D and the power reception coil 50D of the fifth embodiment as viewed from the side. In FIG. 9, the magnetic flux path is shown using broken lines. The present embodiment is characterized in that the power transmission core 41 has a convex portion 80 that protrudes toward the power receiving coil 50 </ b> D, and the power transmission winding 42 is wound around the tip of the convex portion 80. Among the power transmission windings 42 disposed on the facing surface 41a, a portion 42a of the power transmission winding 42 disposed on the convex portion 80 is closer to the power receiving coil 50D than the other portion 42b of the power transmission winding 42. positioned.

  Since the power transmission winding 42 is wound around the tip of the convex portion 80 in this manner, a magnetic flux path that is convex toward the power receiving coil 50D can be formed in the power transmission coil 40D. As a result, it is possible to achieve the same effect of reducing the leakage magnetic flux as in the first embodiment.

  Further, by adjusting the length dimension of the projection 80 (the vertical dimension in FIG. 9), the position of the portion 42a of the power transmission winding 42 that is located closest to the power receiving coil 50D can be adjusted. Therefore, by adjusting the length dimension of the convex part 80, it can set easily so that it may have optimal power transmission efficiency.

  In addition, the dimension in the width direction at the tip of the convex portion 80 is not limited to the dimension in which the plurality of power transmission windings 42 are disposed, and may be a dimension in which at least one power transmission winding 42 is disposed. .

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a cross-sectional view of the power transmission coil 40E and the power reception coil 50E of the sixth embodiment as viewed from the side. In FIG. 10, the magnetic flux path is shown using broken lines. In the present embodiment, the power transmission core 41 has two convex portions 80E that are convex toward the power receiving coil 50D, and the power transmission winding 42 is tightly wound between the tip of the convex portion 80E and the adjacent convex portion 80E. It is characterized in that it is turned. The height positions of the two convex portions 80E are substantially equal.

  Among the power transmission windings 42 disposed on the facing surface 41a, a part 42a of the power transmission winding 42 disposed at the tip of the convex portion 80E is more than the other part 42b of the power transmission winding 42. Located on the side.

  As described above, even when the portion 42a of the power transmission winding 42 is not disposed at the center, the two convex portions 80E are disposed across the center, and the power transmission winding 42 is wound around the tip. Therefore, a magnetic flux path that is convex toward the power receiving coil 50E can be formed in the power transmitting coil 40E. As a result, it is possible to achieve the same effect of reducing the leakage magnetic flux as in the first embodiment.

  Moreover, although the convex part 80E is integrally formed with the power transmission core 41, it may be a separate body. Further, the convex portion 80E may be made of a non-metallic material like the spacer 70 described above.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 11 is a cross-sectional view of the power transmission coil 40F and the power reception coil 50F of the seventh embodiment as viewed from the side. In FIG. 11, a magnetic flux path is shown using a broken line. The present embodiment is characterized in that the facing surface 41a of the power transmission core 41 is curved so as to protrude toward the power receiving coil 50F, and the power transmission winding 42 is wound around the curved facing surface 41a. . When the winding is wound around the curved facing surface 41a, the windings can be arranged in a convex shape as shown in FIG. Thus, a magnetic flux path that is convex toward the power receiving coil 50F can be formed in the power transmitting coil 40F. Accordingly, it is possible to achieve the same effect of reducing the leakage magnetic flux as in the first embodiment.

(Eighth embodiment)
Next, an eighth embodiment of the present invention will be described with reference to FIG. FIG. 12 is a cross-sectional view of the power transmission coil 40G and the power reception coil 50G of the eighth embodiment as viewed from the side. In FIG. 12, the magnetic flux path is shown using broken lines. The present embodiment is characterized in that the shapes of the power transmission core 41 and the power reception core 51 are flat U-shaped plates.

  At both ends of the power transmission core 41 in the width direction (left and right direction in FIG. 12), a power transmission protrusion (primary protrusion) 43 that protrudes toward the power reception core 51 is formed. A power transmission winding 42 is wound around the portion excluding the tip, and a part of the power transmission coil 40G is configured. Therefore, the cross-sectional shape of the power transmission core 41 is U-shaped, and both end portions thereof correspond to the power transmission protrusions 43.

  The power transmission winding 42 wound around the power transmission protrusion 43 is disposed on both surfaces of the power transmission protrusion 43 in the width direction. In other words, the winding axis of the power transmission winding 42 wound around the power transmission protrusion 43 extends in the thickness direction of the power transmission core 41.

  Further, at both ends of the power receiving core 51 in the width direction (left and right direction in FIG. 12), a power receiving protruding portion (secondary protruding portion) 53 that is convex toward the power transmitting core 41 is formed. A power receiving coil 52 is wound around a portion excluding the tip of the power receiving coil 50 to form a power receiving coil 50G. Therefore, the cross-sectional shape of the power receiving core 51 is U-shaped, and both end portions thereof correspond to the power receiving protrusions 53.

  The power receiving winding 52 wound around the power receiving protrusion 53 is disposed on both surfaces of the power receiving protrusion 53 in the width direction. In other words, the winding axis of the power receiving winding 52 wound around the power receiving protrusion 53 extends in the thickness direction of the power receiving core 51.

  Moreover, the power transmission protrusion 43 and the power reception protrusion 53 are disposed so as to face each other in the thickness direction. And the part 42a of the coil | winding 42 for power transmission arrange | positioned at the opposing surface 41a of the power transmission core 41 is overlapped and wound similarly to the above-mentioned 1st Embodiment, The uppermost layer ( In the present embodiment, the portion 42a of the fourth layer) is located closer to the power receiving coil 50G than the other portion 42b of the power transmission winding 42. Therefore, as described above, a magnetic flux path that protrudes toward the power receiving coil 50G can be formed in the power transmitting coil 40G. As a result, it is possible to achieve the same effect of reducing the leakage magnetic flux as in the first embodiment.

(Ninth embodiment)
Next, a ninth embodiment of the present invention will be described with reference to FIG. FIG. 13: is sectional drawing which looked at the power transmission coil 40H and the power receiving coil 50H of 9th Embodiment from the side surface. In FIG. 13, the magnetic flux path when power is transmitted from the power receiving coil 50H to the power transmitting coil 40H is indicated by using broken lines. The present embodiment is characterized in that the configurations of the power transmission coil 40H and the power reception coil 50H are the same. In the first embodiment described above, only power is transmitted from the power transmission coil 40H to the power reception coil 50H. However, in this embodiment, power is transmitted from the power reception coil 50H to the power transmission coil 40H, and the power of the vehicle 22 is reversed to the grid. The non-contact power feeding system 10 is employed.

  Accordingly, the power transmission circuit 31 also has a function as the above-described power reception circuit 23, and the power reception circuit 23 also has a function as the power transmission circuit 31. The power receiving circuit 23 has a function of converting DC power from the main battery 21 into AC power (DC / AC conversion). As a result, the power receiving circuit 23 can function as the power transmitting circuit 31.

  In the present embodiment, the power receiving coil 50H has the same configuration as that of the power transmitting coil 40H. Therefore, when power is transmitted from the power receiving coil 50H to the power transmitting coil 40H, as shown in FIG. The effect by the magnetic flux path can be achieved. Thereby, even if it is the structure in which bidirectional power transmission is possible, the non-contact electric power feeder which suppressed the leakage magnetic flux at the time of power transmission is realizable.

(10th Embodiment)
Next, a tenth embodiment of the present invention will be described with reference to FIG. FIG. 14 is a cross-sectional view of the power transmission coil 40I and the power reception coil 50I of the tenth embodiment as viewed from the side. In FIG. 14, the magnetic flux path when power is transmitted from the power receiving coil 50I to the power transmitting coil 40I is shown using a broken line. In the present embodiment, similar to the ninth embodiment described above, the non-contact power feeding system 10 that transmits power from the power receiving coil 50I to the power transmitting coil 40I and reversely powers the power of the vehicle 22 to the system is employed.

  Accordingly, the power transmission circuit 31 also has a function as the above-described power reception circuit 23, and the power reception circuit 23 also has a function as the power transmission circuit 31. The power receiving circuit 23 has a function of converting DC power from the main battery 21 into AC power (DC / AC conversion). As a result, the power receiving circuit 23 can function as the power transmitting circuit 31.

  The power receiving coil 50 has the same configuration as that of the power transmitting coil 40G of the eighth embodiment described above. Accordingly, a part 52a of the power receiving winding 52 disposed on the facing surface 51a of the power receiving core 51 is wound in an overlapping manner, as in the first embodiment, and the uppermost layer ( In this embodiment, a part 52a of the fourth layer) is located closer to the power transmission coil 40I than the other part 52b of the power receiving winding 52. Therefore, when power is transmitted from the power receiving coil 50I to the power transmitting coil 40I, the effect of the convex magnetic flux path in the power transmitting coil 40 can be achieved as shown in FIG. Thereby, even if it is the structure in which bidirectional power transmission is possible, the non-contact electric power feeder which suppressed the leakage magnetic flux at the time of power transmission is realizable.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the first embodiment described above, the non-contact power feeding device is used when charging the vehicle 22, but is not limited to a moving body such as the vehicle 22, and is used for another fixed power consumption medium. Also good. The supplied electric power is not limited to use for charging, and the supplied electric power may be supplied to an apparatus that consumes the electric power sequentially with a load.

  In addition, each core may be formed using a magnetic material other than ferrite, for example, a ferromagnetic material with little AC loss such as a dust core or a silicon steel plate, and each winding may be composed of a wire other than a litz wire.

  Further, the number of turns of the power transmission winding 42 and the power reception winding 52 shown in each drawing is an example, and is not limited to the number shown in the drawing.

10 ... Non-contact power feeding system (Non-contact power feeding device)
DESCRIPTION OF SYMBOLS 21 ... Main battery 22 ... Vehicle 23 ... Power receiving circuit 24 ... Vehicle side pad 31 ... Power transmission circuit 32 ... Ground side pad 40 ... Power transmission coil (primary side coil)
41 ... Power transmission core (primary core)
41a ... Opposing surface 41b ... Back side 42a ... Part of the power transmission winding 42b ... Other part of the power transmission winding 42 ... Power transmission winding (winding)
43 ... Power transmission protrusion (primary protrusion)
50 ... Receiving coil (secondary coil)
51 ... Power receiving core (secondary core)
52. Winding for receiving power (winding)
53 ... Power receiving protrusion (secondary protrusion)
60 ... Conductive plate (suppressing part)
70 ... spacer 80 ... convex part

Claims (8)

A non-contact power feeding device (10) that performs non-contact power transmission from a primary coil (40) to a secondary coil (50),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
The both cores are arranged so that the surfaces on one side in the thickness direction face each other,
A part of the winding arranged on the opposing surface (41a) on the secondary core side in the primary side core is overlapped and wound, and a part of the overlapped uppermost layer winding is partly wound. There the non-contact power feeding device shall be the being located in the secondary coil side than the other portions. A non-contact power feeding device (10) that performs non-contact power transmission from a primary coil (40) to a secondary coil (50),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
The both cores are arranged so that the surfaces on one side in the thickness direction face each other,
Opposing surfaces of the secondary core side of the primary core (41a) is Ri Na curved to be convex toward the secondary core,
Wherein one of said windings being disposed on opposite surfaces, the non-contact you, characterized in that a portion of the winding (42a) is positioned in the secondary coil side than the other portion (42b) Power supply device. A non-contact power feeding device (10) that performs non-contact power transmission from a primary coil (40) to a secondary coil (50),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
The both cores are arranged so that the surfaces on one side in the thickness direction face each other,
The secondary core side facing surface (41a) of the primary side core has a convex portion (80) that is convex toward the secondary side core,
The winding is wound around the tip of the convex part,
Of the windings arranged on the facing surface, a part (42a) of the winding arranged at the tip of the convex portion is located closer to the secondary coil side than the other part (42b). a non-contact power feeding device you wherein a has. A non-contact power feeding device (10) that performs non-contact power transmission from a primary coil (40) to a secondary coil (50),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
The both cores are arranged so that the surfaces on one side in the thickness direction face each other,
Made of a non-metal, a part of the facing surface of the secondary core side of the primary core (41a) is a spacer (70) is provided extending toward the secondary core,
The winding is wound around the tip of the spacer,
Of the windings arranged on the facing surface, a part (42a) of the winding arranged at the tip of the spacer is positioned closer to the secondary coil side than the other part (42b). non-contact power feeding device characterized in that there. A non-contact power feeding device (10) that performs non-contact power transmission from a primary coil (40) to a secondary coil (50),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
The both cores are arranged so that the surfaces on one side in the thickness direction face each other,
The winding disposed on the opposing surface (41a) on the secondary core side of the primary core is a direction intersecting with the extending direction of the winding on the opposing surface, Are arranged in a direction along
A portion of the winding which is located the secondary coil side, the non-contact power feeding device shall be the being located in the center of the array of direction in the primary core. A non-contact power feeding device (10) that performs non-contact power transmission from a primary coil (40) to a secondary coil (50),
A primary coil including a plate-like primary core (41) and a winding (42) wound around the primary core;
A secondary coil including a plate-like secondary core (51) and a winding (52) wound around the secondary core,
At least a part of the winding of each coil is disposed on both surfaces in the thickness direction of each core,
The both cores are arranged so that the surfaces on one side in the thickness direction face each other,
At both ends in the width direction of the primary side core, a primary side protruding portion (43) that protrudes toward the secondary side core is formed, and a portion excluding the tip of the primary side protruding portion The winding is wound to constitute a part of the primary coil,
Secondary side protrusions (53) that protrude toward the primary side core are formed at both ends in the width direction of the secondary side core, and portions excluding the tip of the secondary side protrusion The secondary-side coil is formed by winding the winding around the secondary-side protrusion.
The primary side protruding part and the secondary side protruding part are arranged to face each other,
A portion (42a) of the winding disposed on the opposing surface (41a) on the secondary core side in the primary core is wound in an overlapping manner, and the overlapping uppermost layer winding non-contact power feeding device part of you and being located on the secondary coil side than the other portion (42b). The primary said winding being disposed on the rear the a surface opposite to the facing surface of the core (41b) is any of claims 1-6, characterized in that it is arranged not to overlap The non-contact electric power feeder as described in any one. The primary side core further includes a suppressing portion (60) that is provided on a back surface that is a surface opposite to the facing surface and suppresses leakage of a magnetic field from the winding located on the back surface to the outside. The contactless power feeding device according to any one of claims 1 to 7 .

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