WO2013099222A1

WO2013099222A1 - Non-contact charging device

Info

Publication number: WO2013099222A1
Application number: PCT/JP2012/008275
Authority: WO
Inventors: 秀樹定方; 藤田　篤志; 別荘　大介
Original assignee: パナソニック株式会社
Priority date: 2011-12-27
Filing date: 2012-12-25
Publication date: 2013-07-04

Abstract

A non-contact charging device, wherein a metal frame is arranged separated from a power reception coil such that: the shortest distance from the outermost peripheral wire in a power supply coil to the outermost peripheral wire in the power reception coil is shorter than the shortest distance from the outermost peripheral wire in the power supply coil to the metal frame, in a state wherein the amount of positional deviation between the power supply coil and the power reception coil in a direction along the facing surfaces of the coils is within a chargeable range. Accordingly, even if positional deviation occurs between the power supply coil and the power reception coil, inductive heating of the metal frame can be prevented, and danger caused by said heating can be prevented, if the amount of positional deviation is within the chargeable range.

Description

Non-contact charger

The present invention relates to a non-contact charging device used for charging a moving body that moves by electric power, such as an electric propulsion vehicle such as an electric vehicle or a plug-in hybrid vehicle.

FIG. 9 is a schematic diagram showing a configuration of a conventional non-contact charging device 106. In FIG. 9, the non-contact power feeding device (primary side) F connected to the power source 109 of the power board on the ground side is supplied with power to the power receiving device (secondary side) G mounted on the electric propulsion vehicle. It arrange | positions so that it may oppose through the air gap which is a space | gap space without a physical connection. In such an arrangement state, when an alternating current is applied to the primary coil 107 (power feeding coil) provided in the power feeding device F to form a magnetic flux, an induced electromotive force is generated in the secondary coil 108 (power receiving coil) provided in the power receiving device G. As a result, electric power is transmitted from the primary coil 107 to the secondary coil 108 in a contactless manner.

The power receiving device G is connected to, for example, the in-vehicle battery 110, and the in-vehicle battery 110 is charged with the electric power transmitted as described above. The on-vehicle motor 111 is driven by the electric power stored in the battery 110. Note that, during the non-contact power supply process, for example, the wireless communication device 112 exchanges necessary information between the power supply device F and the power reception device G.

FIG. 10 is a schematic diagram showing the internal structure of the power feeding device F and the power receiving device G. In particular, FIG. 10A is a schematic diagram showing an internal structure when the power feeding device F is viewed from above and the power receiving device G is viewed from below. FIG. 10B is a schematic diagram illustrating an internal structure when the power feeding device F and the power receiving device G are viewed from the side. In FIG. 10, reference numerals of the components of the power receiving device G corresponding to the components of the power feeding device F are shown in parentheses.

10, the power feeding device F includes a primary coil 107, a primary magnetic core 113, a back plate 115, a cover 116, and the like. Briefly speaking, the power receiving device G has a symmetric structure with the power feeding device F, and includes a secondary coil 108, a secondary magnetic core 114, a back plate 115, a cover 116, and the like. The surface of the primary magnetic core 113 and the surfaces of the secondary coil 108 and the secondary magnetic core 114 are covered and fixed with a mold resin 117 mixed with a foam material 118, respectively.

Here, the relationship between the primary coil 107 of such a conventional power feeding device F and the secondary coil 108 of the power receiving device G will be described with reference to the schematic diagram of FIG. As shown in FIG. 11A, the primary coil 107 and the secondary coil 108 are formed by spirally winding

litz wires

121 and 122 in which a plurality of strands are bundled. The primary coil 107 of the ground-side power supply device F is disposed so as to face the secondary coil 108 of the power receiving device G mounted on the vehicle in a state where the vehicle is parked in a predetermined parking space. As shown in FIG. 11A, the primary coil 107 and the secondary coil 108 face each other and are linked over a wide range, whereby non-contact power transmission is performed.

Further, in the electric propulsion vehicle, the secondary coil 108 of the power receiving device G mounted on the lower part of the vehicle is surrounded by the side periphery of the secondary coil 108 in order to prevent the secondary coil 108 from colliding with other objects and being damaged. It is conceivable to provide a metal frame 128 made of a rigid metal.

JP 2008-87733 A

However, as shown in FIG. 11B, when the vehicle is parked with a positional deviation from the parking space, a positional deviation S occurs between the power feeding device F and the power receiving device G. In such a case, the shortest distance L1 from the outermost wire 121 of the primary coil 107 of the power feeding device F to the outermost wire 122 of the secondary coil 108 of the power receiving device G is the outermost wire of the primary coil 107. The distance may be longer than the shortest distance L2 from 121 to the metal frame 128 of the power receiving device G. When power supply is performed in a state where the positional deviation S has occurred, the metal frame 128 is coupled with the magnetic field generated from the primary coil 107 and is induction-heated, causing the metal frame 128 to rise in temperature. If an occupant or the like of an electric propulsion vehicle accidentally touches the metal frame 128, there is a possibility that there is a risk of a burn or the like depending on the degree of temperature rise.

In addition, as shown in FIG. 12A, the non-contact charging device 106 is provided with a position detecting means 130 for detecting a relative displacement amount between the primary coil 107 and the secondary coil 108. There may be. As this position detection means 130, for example, a pair of

position detection sensors

131 and 132 disposed opposite to each other on the power feeding device F and the power receiving device G are used. In the power receiving device G, it is disposed between the secondary coil 108 and the metal frame 128 in order to protect the position detection sensor 132.

However, as illustrated in FIG. 12B, when a positional deviation occurs between the power feeding device F and the power receiving device G, the power receiving device G 2 is connected to the outermost wire 121 of the primary coil 107 of the power feeding device F. In some cases, the shortest distance L1 from the outermost peripheral wire 121 of the primary coil 108 to the shortest distance L3 from the outermost peripheral wire 121 of the primary coil 107 to the position detection sensor 132 of the power receiving device G may be longer. The position detection sensor 132 often uses a metal part such as an antenna for wireless communication. When power is fed in a state where such a position shift occurs, the position detection sensor 132 also Inductive heating is performed, and the position detection sensor 132 may be damaged.

Accordingly, an object of the present invention is to solve the above-described problem, and even if a positional deviation occurs between the power feeding device and the power receiving device, a metal component such as a metal frame provided in the power receiving device is provided. An object of the present invention is to provide a non-contact charging device that is not induction-heated.

In order to achieve the above object, the present invention is configured as follows.

A non-contact charging device according to one aspect of the present invention includes a power feeding device having a power feeding coil that generates a magnetic flux by an input alternating current, and a power receiving device having a power receiving coil mounted on a moving body, A non-contact charging device that supplies power by electromagnetic induction between a coil and a power receiving coil positioned opposite to the power feeding coil, the power receiving device being arranged around the side of the power receiving coil and moving It has a metal frame fixed to the body and receives power from the outermost peripheral wire of the power supply coil in a state where the amount of positional deviation between the power supply coil and the power reception coil in the direction along the opposing surface of the coil is within the chargeable range. The metal frame is placed away from the receiving coil so that the shortest distance from the outermost peripheral wire of the coil is shorter than the shortest distance from the outermost peripheral wire of the power supply coil to the metal frame. It has been.

Further, a non-contact charging device according to another aspect of the present invention includes a power feeding device having a power feeding coil that generates magnetic flux by an input alternating current, and a power receiving device having a power receiving coil mounted on a moving body. A non-contact charging device that supplies electric power by electromagnetic induction between a power feeding coil and a power receiving coil positioned opposite to the power feeding coil, the power receiving device being disposed around a side of the power receiving coil. A metal frame fixed to the moving body; a position detection sensor that detects a relative position of the power receiving device with respect to the power feeding device; and a control device that controls a charging operation by supplying power from the power feeding coil to the power receiving coil. The control device has a shortest distance from the outermost peripheral wire of the power supply coil to the outermost peripheral wire of the power receiving coil, more than the shortest distance from the outermost peripheral wire of the power supply coil to the metal frame. The amount of misalignment between the power supply coil and the power receiving coil in the direction along the opposing surface of the coil that becomes shorter is included as information on the chargeable range, and the amount of misalignment detected by the position detection sensor is information on the chargeable range. Compared with, the charging operation is controlled so as not to start power feeding when it is determined that the amount of positional deviation exceeds the chargeable range.

According to the present invention, the outermost peripheral wire of the power receiving coil is changed from the outermost peripheral wire of the power receiving coil in a state where the amount of positional deviation between the power feeding coil and the power receiving coil in the direction along the opposing surface of the coil is within the chargeable range. The metal frame is disposed away from the power receiving coil so that the shortest distance is shorter than the shortest distance from the outermost peripheral wire of the power feeding coil to the metal frame. Therefore, even if a positional deviation occurs between the power feeding coil and the power receiving coil, if the positional deviation amount is within the chargeable range, the metal frame can be prevented from being induction heated and heated. Risk prevention.

Also, the information on the chargeable range is held in the control device, and the control is performed so that the charging operation is not started when the detected positional deviation amount exceeds the chargeable range, so that the metal frame is Can be prevented from being induction-heated.

The block diagram of the non-contact charging device concerning Embodiment 1 of the present invention. External view of the non-contact charging device of FIG. External view of the non-contact charging device of FIG. Cross-sectional view of power feeding device and power receiving device (no misalignment, misalignment) Cross section of litz wire Plan view of allowable displacement range Sectional drawing (there is no position shift, there is position shift) of the electric power feeder and power receiving apparatus of the non-contact charging device concerning Embodiment 2 of this invention Flow chart of charging operation start procedure Schematic diagram showing the configuration of a conventional non-contact power transmission system The figure which shows the internal structure of the power receiving apparatus (power feeding apparatus) arrange | positioned facing the power feeding apparatus (power receiving apparatus) of FIG. Sectional drawing of the electric power feeder and power receiving device of FIG. Cross-sectional view of another conventional power feeding device and power receiving device

According to such a configuration, if the charging operation is performed after confirming that the amount of positional deviation between the power feeding coil and the power receiving coil is within the chargeable range, a metal part such as a metal frame is unexpected. Induction heating can be prevented, and safety can be improved.

In addition, the power receiving device is disposed between the power receiving coil and the metal frame, and further includes a position detection sensor that detects the relative position of the power receiving device with respect to the power feeding device, so that the amount of displacement can be charged. Position detection so that the shortest distance from the outermost peripheral wire of the power supply coil to the outermost peripheral wire of the power receiving coil is shorter than the shortest distance from the outermost peripheral wire of the power supply coil to the position detection sensor. The sensor may be arranged away from the power receiving coil.

This can prevent induction heating of the position detection sensor in addition to the metal frame.

According to such a configuration, since the charging operation is started after confirming that the amount of displacement between the feeding coil and the receiving coil is within the chargeable range, the metal part such as the metal frame is expected. It is possible to prevent induction heating without increasing the safety.

Further, the position detection sensor is disposed between the power receiving coil and the metal frame around the side of the power receiving coil, and the control device transmits information from the outermost peripheral wire of the power feeding coil to the outermost peripheral wire of the power receiving coil as information on the chargeable range. Information on the amount of positional deviation between the feeding coil and the receiving coil in the direction along the opposing surface of the coil such that the shortest distance is shorter than the shortest distance from the outermost peripheral wire of the feeding coil to the position detection sensor; Comparing the amount of misalignment detected by the position detection sensor with the chargeable range information, and controlling the charging operation so as not to start power supply when it is determined that the amount of misalignment exceeds the chargeable range You may do it.

(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by this embodiment.

FIG. 1 is a block diagram of a non-contact charging apparatus according to the present invention. 2 and 3 are external views of a vehicle (for example, an example of a moving body such as an electric propulsion vehicle (vehicle body)) installed in a parking space. As shown in FIGS. 1, 2, and 3, the non-contact charging device includes, for example, a power feeding device (non-contact power feeding device) 2 installed in a parking space and a power receiving device (non-contact) mounted on an electric propulsion vehicle, for example. Contact power receiving device) 4.

The power feeding device 2 includes a primary side rectifier circuit 8 connected to a commercial power source 6, an inverter unit 10, a ground side coil unit (primary coil unit or power feeding coil unit) 12, and a control unit (for example, a microcomputer). 16 and the primary side rectifier circuit 8 and the inverter unit 10 constitute a power control device 17. On the other hand, the power receiving device 4 includes a vehicle side coil unit (secondary coil unit or power receiving coil unit) 18, a secondary side rectifier circuit 20, a battery (load) 22, and a control unit (for example, a microcomputer) 24. I have.

In the power supply device 2, the commercial power source 6 is a 200 V commercial power source that is a low-frequency AC power source, and is connected to the input end of the primary side rectifier circuit 8. The output end of the primary side rectifier circuit 8 is the input of the inverter unit 10. The output end of the inverter unit 10 is connected to the ground side coil unit 12. On the other hand, in the power receiving device 4, the output end of the vehicle side coil unit 18 is connected to the input end of the secondary side rectifier circuit 20, and the output end of the secondary side rectifier circuit 20 is connected to the battery 22.

Further, the ground side coil unit 12 is laid on the ground, and the primary side rectifier circuit 8 is erected, for example, at a position separated from the ground side coil unit 12 by a predetermined distance (see FIG. 2). On the other hand, the vehicle side coil unit 18 is attached to, for example, a vehicle body bottom (for example, a chassis).

The power feeding device side control unit 16 performs wireless communication with the power receiving device side control unit 24, and the power receiving device side control unit 24 determines a power command value according to the detected remaining voltage of the battery 22, and determines the determined power command value. It transmits to the electric power feeder side control part 16. The power feeding device side control unit 16 compares the power feeding power detected by the ground side coil unit 12 with the received power command value, and drives the inverter unit 10 so as to obtain the power command value.

During power feeding, the power receiving device side control unit 24 detects the received power, and changes the power command value to the power feeding device side control unit 16 so that the battery 22 is not overcurrent or overvoltage.

As shown in FIGS. 2 and 3, when power is supplied from the power feeding device 2 to the power receiving device 4, the vehicle-side coil unit 18 is disposed so as to face the ground-side coil unit 12 by appropriately moving the vehicle body (vehicle). Then, when the power feeding device side control unit 16 drives and controls the inverter unit 10, a high frequency electromagnetic field is formed between the ground side coil unit 12 and the vehicle side coil unit 18. The power receiving device 4 takes out electric power from a high frequency electromagnetic field and charges the battery 22 with the taken out electric power.

FIG. 4 is a cross-sectional view of the ground side coil unit 12 and the vehicle side coil unit 18 of the contactless charging apparatus of the first embodiment. As shown in FIG. 4A, the ground side coil unit 12 includes a base 31 fixed on the ground side, a power supply coil 32 disposed on the base 31, and a cover 33 that is a casing that covers the power supply coil 32. And.

The vehicle side coil unit 18 includes a base 34 fixed to the vehicle body, a power receiving coil 35 disposed on the base 34, and a cover 36 that is a casing covering the power receiving coil 35. Further, a metal formed of a rigid metal is provided around the side of the power receiving coil 35 and the cover 36 so that the power receiving coil 35 and the cover 36 covering the power receiving coil 35 do not collide with other objects and are damaged. A frame 37 is provided in the vehicle side coil unit 18. Note that such a metal frame 37 is fixed to the bottom of the vehicle body and has higher rigidity than the cover 36, and plays a role in preventing other objects from colliding with at least the side surfaces of the power receiving coil 35 and the cover 36. ing. The

covers

33 and 36 are formed of a resin material or the like so as not to be affected by the magnetic field.

The feeding coil 32 is formed by winding the litz wire 41 a plurality of times in a spiral shape. Similarly, the power receiving coil 35 is formed by winding the litz wire 42 a plurality of times in a spiral shape. Each of the

coils

32 and 35 has an annular shape.

Here, as a cross-sectional view of the

litz wires

41 and 42 forming the respective coils, a cross-sectional view of the litz wire 41 is shown in FIG. As shown in FIG. 5, the litz wire 41 is formed by bundling a plurality of strands 43 and has a substantially circular cross section. The litz wire 41 and the litz wire 42 have substantially the same cross-sectional structure.

The power feeding coil 32 and the power receiving coil 35 are formed by winding the

litz wires

41 and 42 having such a cross-sectional shape, for example, with the same number of turns (number of windings) in the opposing surface of the coil. In the first embodiment, the outer diameter (outer shape) and inner diameter of power receiving coil 35 having an annular shape are formed to be approximately the same as the outer diameter and inner diameter of power feeding coil 32.

Thus, by making the outer diameter of the power receiving coil 35 substantially the same as the outer diameter of the power feeding coil 32, the magnetic flux generated from the power feeding coil 32, the power receiving coil 35, Can be effectively linked over a wide range, and good power supply efficiency can be obtained.

On the other hand, since the power receiving coil 35 is mounted on the vehicle and the power feeding coil 32 is disposed on the ground, both coils in the direction along the opposing surface of the coil (that is, the direction along the ground plane in the first embodiment). Misalignment may occur between the two. Thus, even when a positional deviation occurs between the coils, a range in which the magnetic flux generated from the power feeding coil 32 and the power receiving coil 35 can be effectively linked over a wide range and can be charged (a chargeable range ( A chargeable range R is set in advance in the non-contact charging device as the positional deviation allowable range R. In the first embodiment, the direction along the facing surface of the coil is the first direction D1, and the direction orthogonal to the facing surface is the second direction D2.

Such a misalignment allowable range R is shown in FIG. As shown in FIG. 6, the chargeable range R is a substantially circular region in plan view. The chargeable range R is set to an appropriate range based on the specifications of the

litz wires

41 and 42, the required power supply efficiency, the outer diameters of the power supply coil 32 and the power reception coil 35, and the like.

Further, in the case where the power receiving coil 35 and the power feeding coil 32 are disposed relatively inclined, the positional deviation is based on the projected area of the power receiving coil 35 projected onto the power feeding coil 32. It can be determined whether or not it is within the chargeable range R. Therefore, it is preferable to set the chargeable range R based on the required power supply efficiency and the inclination angle.

4A, in the vehicle side coil unit 18, the side portion 37a of the metal frame 37 is disposed away from the power receiving coil 35. As shown in FIG. FIG. 4B shows a state in which a positional deviation occurs between the power feeding coil 32 and the power receiving coil 35 in the first direction D1, and the positional deviation is the same magnitude as the limit of the chargeable range R. Shown in As shown in FIG. 4B, the shortest distance L1 from the litz wire 41 located on the outermost periphery of the power supply coil 32 to the litz wire 42 located on the outermost periphery of the power receiving coil 35 is located on the outermost periphery of the power supply coil 32. The side portion 37 a of the metal frame 37 is disposed away from the power receiving coil 35 so as to be shorter than the shortest distance L 2 from the litz wire 41 to the side portion 37 a of the metal frame 37.

As described above, the side portion 37a of the metal frame 37 is arranged so as to be separated from the power receiving coil 35, so that the positional deviation in the first direction D1 generated between the power feeding coil 32 and the power receiving coil 35 is within the chargeable range R. If so, it is possible to prevent the metal frame 37 from being inductively heated in combination with the magnetic field generated from the power supply coil 32. Therefore, by managing whether the misalignment is within the chargeable range R, unexpected heating of the metal frame 37 can be prevented, and the safety of the non-contact charging device can be further enhanced. Further, by suppressing the metal frame 37 from being coupled with the magnetic field, the power supply efficiency in the charging operation can be increased.

(Embodiment 2)
In addition, this invention is not limited to the above-mentioned embodiment, It can implement in another various aspect. For example, FIG. 7 shows a configuration of a contactless charging apparatus according to Embodiment 2 of the present invention. In the contactless charging apparatus of the second embodiment, the same reference numerals are given to the same components as those of the contactless charging apparatus of the first embodiment, and the description thereof is omitted.

As shown in FIG. 7A, the contactless charging apparatus according to the second embodiment further includes position detection means 50 that detects a relative position of the power receiving coil 35 with respect to the power feeding coil 32 in the first direction D1. This is different from the first embodiment.

In the non-contact charging apparatus according to the second embodiment, the position detection means 50 includes a plurality of position detection sensors 51 provided in the ground side coil unit 12 and a plurality of position detection sensors 52 provided in the vehicle side coil unit 18. Is configured. The position detection sensors 51 on the ground side coil unit 12 side are arranged at equal intervals around the side of the power supply coil 32, and similarly, the position detection sensors 52 on the vehicle side coil unit 18 side include the power receiving coil 35. It is arranged at equal intervals around the side of the. Further, the position detection sensor 51 on the ground side coil unit 12 side and the position detection sensor 52 on the vehicle side coil unit 18 side in a state where the power feeding coil 32 and the power receiving coil 35 are positioned without positional deviation. Are arranged so that they face each other in the second direction D2.

A sensing operation such as communication (for example, wireless) is performed between the position detection sensor 51 on the ground side coil unit 12 side and the position detection sensor 52 on the vehicle side coil unit 18 side, and the ground side coil unit 12 or the vehicle side By outputting the result to the

control units

16 and 24 of the coil unit 18, the

control unit

16 or 24 can detect the relative positional deviation amount between the power supply coil 32 and the power reception coil 35.

Further, the

control unit

16 or 24 holds information on the chargeable range R in advance, and can determine whether or not the positional deviation amount detected by the position detection unit 50 is within the chargeable range R. It has become.

Further, such

position detection sensors

51 and 52 incorporate metal parts such as an antenna for performing the sensing operation described above. In the second embodiment, in the vehicle side coil unit 18, in addition to the metal frame 37, the position detection sensor 52 in which such a metal part is incorporated is also heated by induction heating during the charging operation. It is preventing.

Specifically, in the first direction D1, a state in which the positional shift generated between the feeding coil 32 and the power receiving coil 35 is the same positional shift as the limit of the chargeable range R is shown in FIG. ). As shown in FIG. 7B, the shortest distance L <b> 1 from the litz wire 41 located on the outermost periphery of the power supply coil 32 to the litz wire 42 located on the outermost periphery of the power receiving coil 35 is located on the outermost periphery of the power supply coil 32. The position detection sensor 52 is disposed away from the power receiving coil 35 so as to be shorter than the shortest distance L3 from the litz wire 41 to the position detection sensor 52. Note that the side 37a of the metal frame 37 is separated from the power receiving coil 35 as in the first embodiment.

As described above, in the vehicle side coil unit 18, the position detection sensor 52 is further arranged away from the power receiving coil 35, so that the positional deviation in the first direction D <b> 1 generated between the power feeding coil 32 and the power receiving coil 35. Is within the chargeable range R, it is possible to prevent the position detection sensor 52 from being inductively heated in combination with the magnetic field generated from the power feeding coil 32. Therefore, by managing whether or not the positional deviation is within the chargeable range R, unexpected heating of the metal frame 37 and the position detection sensor 52 can be prevented, and the safety of the non-contact charging device can be further improved.

Further, as shown in FIG. 7B, the outermost of the feeding coil 32 is longer than the shortest distance L1 from the litz wire 41 located on the outermost circumference of the feeding coil 2 to the litz wire 42 located on the outermost circumference of the power receiving coil 35. It is more preferable that the position detection sensor 51 is disposed away from the power supply coil 32 so that the shortest distance from the litz wire 41 located on the outer periphery to the position detection sensor 51 of the ground side coil unit 12 is increased.

In addition, when it is difficult to realize the arrangement of the metal frame 37 and the

position detection sensors

51 and 52 as described above, for example, each member is made of a metal material having excellent permeability (for example, a ferrite material). It is also possible to reduce the influence of magnetism and prevent induction heating.

Here, the procedure of performing the charging operation after detecting whether or not the positional deviation between the power feeding coil 32 and the power receiving coil 35 is within the chargeable range R (that is, the charging start operation) is a flowchart of FIG. Will be described.

First, in step S1 of the flowchart of FIG. 8, the power receiving coil 36 is relatively positioned with respect to the power feeding coil 32 by moving the electric propulsion vehicle.

Next, in step S2, the position detection amount between the two coils is detected using the

position detection sensors

51 and 52. Information on the detected displacement amount is input to the

control unit

16 or 24.

In the

control unit

16 or 24, information on the chargeable range R is stored in advance in the memory unit or the like, and the input positional deviation amount is compared with the chargeable range R (step S3). As a result, when it is determined that the misregistration amount exceeds the rechargeable range R, an alarm is output or the misregistration amount exceeds the rechargeable range R for the vehicle operator. Therefore, it is notified that the charging operation cannot be started (step S5). The operator who has received this warning performs positioning of the vehicle again, and performs the operations of steps S1 and S2 until it is determined that the amount of displacement is within the chargeable range R.

On the other hand, when it is confirmed in step S3 that the detected positional deviation amount is within the chargeable range R, a charging operation start command is output from the

control unit

16 or 24, and the power receiving coil 32 receives power. Power is supplied to the coil 35 (step S4).

According to the second embodiment, after confirming that the displacement amount between the feeding coil 32 and the receiving coil 35 is within the chargeable range R, the charging operation is performed, and the displacement amount can be charged. When the range R is exceeded, an alarm is output so that the charging operation is not started. Thereby, it can prevent that the side part 37a of the metal frame 37, the position detection sensor 52, etc. are induction-heated. Therefore, safety can be improved in the non-contact charging device. Further, by suppressing such induction heating, it is also possible to increase the power supply efficiency (charging efficiency) from the power supply coil 32 to the power reception coil 35.

In the above description, the case where the outer shapes of the feeding coil 32 and the power receiving coil 35 are circular has been described as an example. However, the outer shape may be a polygonal shape.

In addition, although the case where the outer shape and the inner diameter of the substantially annular power supply coil 32 and the power receiving coil 35 are substantially the same has been described as an example, the sizes of both the

coils

32 and 35 may be different.

Moreover, although the case where the non-contact charging device is mounted on the electric propulsion vehicle has been described as an example in the above-described embodiment, the non-contact charging device moves by electric power such as a ship, an aircraft, and a robot in addition to the electric propulsion vehicle. The present invention can be applied to a case where it is mounted on a moving body.

It should be noted that, by appropriately combining arbitrary embodiments of the above-described various embodiments, the effects possessed by them can be produced.

Although the present invention has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art. Such changes and modifications are to be understood as being included therein, so long as they do not depart from the scope of the present invention according to the appended claims.

Japanese patent application No. filed on December 27, 2011. The disclosure of the specification, drawings, and claims of 2011-286508 is incorporated herein by reference in its entirety.

According to the present invention, in a non-contact charging device including a power feeding device and a power receiving device mounted on a moving body, a charging operation is performed while preventing metal parts such as a metal frame provided in the power receiving device from being inductively heated. Therefore, the present invention can be applied to non-contact power transmission used for charging a mobile body that moves by electric power such as a ship, an aircraft, and a robot in addition to an electric propulsion vehicle.

DESCRIPTION OF SYMBOLS 2 Electric power feeder 4 Power receiving device 6 Commercial power supply 8 Primary side rectifier circuit 10 Inverter part 12 Ground side coil unit 16 Control part 17 Power control device 18 Vehicle side coil unit 20 Secondary side rectifier circuit 22 Battery 24 Control part 31 Base 32 Electric power feeding Coil 33 Cover 34 Base 35 Power receiving coil 36 Cover 37 Metal frame 37a Side 41 Ritz wire 42 Ritz wire 43 Wire 50 Position detection means 51 Position detection sensor 52 Position detection sensor R Position shift tolerance range L1 to L3 Shortest distance

Claims

A power supply device having a power supply coil that generates magnetic flux by an input alternating current, and a power reception device having a power reception coil mounted on a moving body, the state being positioned facing the power supply coil and the power supply coil A non-contact charging device for supplying power by electromagnetic induction between the power receiving coil of
The power receiving device is disposed around a side of the power receiving coil, and has a metal frame fixed to the moving body,
With the amount of positional deviation between the power feeding coil and the power receiving coil in the direction along the opposing surface of the coil being within the chargeable range, from the outermost peripheral wire of the power feeding coil to the outermost peripheral wire of the power receiving coil The non-contact charging device, wherein the metal frame is arranged away from the power receiving coil such that the shortest distance is shorter than the shortest distance from the outermost peripheral wire of the power feeding coil to the metal frame.
The power receiving device further includes a position detection sensor that is disposed between the power receiving coil and a side of the metal frame and detects a relative position of the power receiving device with respect to the power feeding device.
The shortest distance from the outermost peripheral wire of the power supply coil to the outermost peripheral wire of the power receiving coil is the distance from the outermost peripheral wire of the power supply coil to the position detection sensor in a state where the amount of displacement is within the chargeable range. The non-contact charging device according to claim 1, wherein the position detection sensor is disposed apart from the power receiving coil so as to be shorter than the shortest distance.
A power supply device having a power supply coil that generates magnetic flux by an input alternating current, and a power reception device having a power reception coil mounted on a moving body, the state being positioned facing the power supply coil and the power supply coil A non-contact charging device for supplying power by electromagnetic induction between the power receiving coil of
The power receiving device is:
A metal frame disposed around a side of the power receiving coil and fixed to the moving body;
A position detection sensor for detecting a relative position of the power reception device with respect to the power supply device;
A control device for controlling a charging operation by supplying power from the power feeding coil to the power receiving coil;
The control device includes:
A direction along the facing surface of the coil such that the shortest distance from the outermost peripheral wire of the power supply coil to the outermost peripheral wire of the power receiving coil is shorter than the shortest distance from the outermost peripheral wire of the power supply coil to the metal frame The amount of misalignment between the power feeding coil and the power receiving coil in as a chargeable range information,
When the positional deviation amount detected by the position detection sensor is compared with the information on the chargeable range, and it is determined that the positional deviation amount exceeds the chargeable range, charging is performed so that power supply is not started. Non-contact charging device that controls operation.
The position detection sensor is arranged between the metal frame around a side of the power receiving coil,
The control device includes:
As information on the chargeable range, the shortest distance from the outermost peripheral wire of the power supply coil to the outermost peripheral wire of the power receiving coil is shorter than the shortest distance from the outermost peripheral wire of the power supply coil to the position detection sensor. Information on the amount of misalignment between the feeding coil and the receiving coil in the direction along the opposing surface of the coil,
When the positional deviation amount detected by the position detection sensor is compared with the information on the chargeable range, and it is determined that the positional deviation amount exceeds the chargeable range, charging is performed so that power supply is not started. The contactless charging apparatus according to claim 3, wherein the operation is controlled.