JP2013090393A - Non-contact charging device and power receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To charge a battery by supplying power from a primary transformer to a secondary transformer through electromagnetic induction because a magnetic flux density in a non-contact space is not sufficiently obtained from a battery charge power.SOLUTION: AC power is induced on a secondary transformer 8 through magnetic flux between a primary transformer 11 and a secondary transformer 8 by energization of a coil of the primary transformer 11. The power is supplied to a battery 7 for charging via a rectifier 9 and a charger 10. Short circuits 40 to be short-circuited via a switch A are arranged in parallel between the secondary transformer 8 and charger 10. Current flowing to the secondary transformer 8 is increased by turning on the switch A, thereby increasing a magnetic flux density of the space.

Description

  The present invention relates to a non-contact charging apparatus that is installed in, for example, a parking lot or the like for charging a battery in a moving body such as an electric vehicle or a plug-in hybrid vehicle in a non-contact state, and a power receiving apparatus used therefor.

  Generally, charging a battery included in a moving body, for example, an electric vehicle or a plug-in hybrid vehicle, is performed by inserting a connector of a cable extending from a power supply facility into a connector included in the moving body. Tedious work such as handling and connector joining.

  Conventionally, a primary side transformer having a primary side coil is provided on the power supply side, a secondary side transformer having a secondary side coil as a power receiving means is provided on the moving body side, and the secondary side receives the magnetic flux from the primary side transformer. A non-contact charging device has been developed that generates predetermined power by electromagnetic induction in a transformer and charges a battery of a moving body in a non-contact manner (see Patent Document 1).

  The non-contact charging device parks the vehicle as the moving body on a power supply facility having the primary transformer, and power is supplied from the primary transformer to the secondary transformer by electromagnetic induction. When the secondary transformer and the secondary transformer are in a directly opposed position, power feeding is performed with the highest efficiency. For this reason, in Patent Document 1, the primary transformer on the power supply facility side or the secondary transformer on the moving body side is configured to be movable by a movable means including an actuator, and when the charge request signal is not received, for example, the primary transformer If the side transformer is held in a position (second arrangement) that does not interfere with the running surface of the parking space and a charge request signal is received, the primary transformer and the secondary transformer are close to each other. It moves so that it may hold | maintain in the position (1st position) which opposes.

  Furthermore, for example, the primary transformer is moved in the horizontal plane (front and rear, left and right) directions by a movable means (actuator), and is moved to a position (third position) where AC power induced in the secondary transformer is increased, for example. . As a result, even when the secondary transformer of the electric vehicle (moving body) cannot be accurately moved onto the primary transformer of the power supply equipment, the movable means is moved to a position where both transformers face each other and is high. Non-contact charging can be performed efficiently.

JP 2010-183804 A (refer to FIG. 6 in particular)

  The non-contact charging device described in Patent Document 1 requires dedicated movable means such as an (electrical or hydraulic) actuator in order to move a primary side (or secondary side) transformer, and a core (iron core). The entire primary side (or secondary side) transformer must be moved by the movable means. For example, a large output actuator (movable means) that can move the entire primary side transformer must be installed in the lower part of the parking space. There is. In addition, in order to face both transformers in the plane direction, the primary transformer is sequentially moved to each coordinate by the movable means, and data of the magnitude of the AC power induced in each secondary transformer at these coordinates is created, The position where the induced AC power is the largest is determined as the optimum position (coordinates), and control for moving the primary transformer toward the coordinates is required, and the control of the movable means is troublesome.

  In the non-contact charging apparatus using electromagnetic induction, the magnetic field in the electromagnetic coupling in the non-contact space is not so large when the battery charging power is supplied, and the primary transformer and the secondary transformer are directly opposed using the magnetic field. It is not always sufficient to attract the position. Moreover, a highly accurate detection means is required also for the detection of the optimal position (coordinates) that is the position where the induced AC power is the largest.

  Accordingly, the present invention provides a non-contact charging device in which the current to the secondary transformer of the power receiving device arranged on the mobile body side is increased, and the magnetic flux density transmitted from the primary transformer to the secondary transformer is increased, and to the same An object of the present invention is to provide a power receiving device to be used.

The present invention includes a primary coil (31) supplied with power from an AC power source (12), a bobbin (30) around which the primary coil is wound, and a core (32) made of a magnetic material. A side transformer (11),
A secondary coil (21) for supplying power to the battery (7) disposed on the moving body (6), a bobbin (20) around which the secondary coil is wound, and a core (22) made of a magnetic material. And a secondary transformer (8) having
Magnetic flux (J) generated in the core (32) of the primary transformer (11) by energization of the primary coil (31) causes the core (22) of the secondary transformer (8) to pass through the space (G). In the non-contact charging device (1) which is transmitted to the secondary coil (21) and charged by supplying the induced AC power to the battery (7),
Between the secondary coil (21) and the charger (10) for charging the battery (7), a short circuit (40) that is short-circuited via a switch (A or B) is disposed in parallel.
It is in the non-contact charging device characterized by the above.

For example, referring to FIG. 1 to FIG. 6, the moving body is an automobile (6) having an electric motor as a drive source, and the secondary transformer (8) is disposed near the floor of the automobile,
The primary transformer (11) is disposed in a power supply facility (2) and is disposed in a space (3) where the automobile can be parked.
At least one of the primary transformer (11) and the secondary transformer (8) (for example, 11) is supported movably,
When the switch (A or B) is turned on, the primary side is generated by the magnetic flux (J) in the space (G) generated based on the current of the secondary coil (31) flowing through the short circuit (40). At least one (for example, 11) of the primary side transformer and the secondary side transformer is moved in a direction in which the transformer (11) and the secondary side transformer (8) face each other.

For example, referring to FIGS. 2 to 4, the primary transformer (11) and the secondary transformer (8) are housed in a flat box type case (35, 25) that is wide in the plane direction with respect to the vertical direction. And
In the secondary transformer (8), the core (22) is integrally fixed to the bobbin (20), and the bobbin (20) and the core (22) are fixed to the case (25).
In the primary transformer (11), the bobbin (30) is fixed to the case (35), and the core (32) interposes a predetermined gap (S, S1, S2) with respect to the bobbin (30). And supported by the case (35) via a support member (36) movable in the plane direction,
The length of the magnetic flux lines (J) in the space (G) between the core (32) of the primary transformer (11) and the core (22) of the secondary transformer (8) is shortened. It moves in the plane direction.

  For example, referring to FIG. 7 and FIG. 8, before charging of the battery (7) is started, the switch (A or B) of the short circuit (40) is turned on, and the secondary coil ( The current flowing through 31) is increased.

  For example, referring to FIG. 7 and FIG. 8, in a charging state in which electric power is supplied from the secondary coil (31) to the battery (7) via the charger (10), the short circuit ( 40) switch (A or B) is turned off.

For example, referring to FIGS. 1 and 4 to 6, a secondary coil (21) that supplies power to a battery (7) disposed in the moving body (6) and a bobbin around which the secondary coil is wound A secondary transformer (8) having (20) and a core (22) made of a magnetic material,
Magnetic flux (J) generated in the core (32) of the primary transformer (11) by energization of the primary coil (31) passes through the space (G) to the core (22) of the secondary transformer (8). In the power receiving device (5) configured to supply the AC power transmitted and induced in the secondary coil (31) to the battery (7) through the rectifier (9) and the charger (10),
Between the secondary coil (21) and the charger (10), a short circuit (40) that is short-circuited via a switch (A or B) is arranged in parallel,
The power receiving device is characterized in that.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, it does not have any influence on the structure of a claim by this.

  According to the first or sixth aspect of the present invention, since the short circuit that is short-circuited via the switch is arranged in parallel between the secondary side coil and the charger, the secondary side coil flows when the switch is turned on. The current increases from the time of charging, thereby increasing the magnetic flux density in the space between the primary transformer and the secondary transformer without increasing the cost. For example, the increased magnetic flux density makes it possible to reliably correct the position of the primary transformer and the secondary transformer so that they face each other, and to easily detect the proper position. It becomes possible.

  According to the second aspect of the present invention, a primary transformer is provided in a power supply facility having a parking space, and an automobile (an electric vehicle, a plug-in hybrid vehicle, etc.) using an electric motor as a drive source is parked in the parking space. Accordingly, the secondary transformer disposed in the automobile is brought close to the primary transformer, and at this time, at least one of the primary transformer and the secondary transformer is movable, and the increased magnetic flux density Since both of the above transformers automatically move in the direction facing each other, there is no need to use dedicated moving means such as actuators, etc., and there is no cost increase, and non-contact charging by electromagnetic induction with high efficiency is performed. Can do.

  According to the third aspect of the present invention, the primary side transformer and the secondary side transformer are housed in a flat box-shaped case that is thin in the vertical direction and wide in the plane direction. Can be placed close to each other on a wide flat surface while being protected against outside air such as snow and snow, and preventing both transformers from coming into direct contact with other objects. Non-contact charging of large electric power such as plug-in hybrid vehicles becomes possible.

  Further, in the primary-side transformer, which is the power supply equipment side, the bobbin is fixed to the case, and the core is supported by a case through a support member that is movable in the plane direction with a predetermined gap with respect to the bobbin. Therefore, the core moves smoothly by a predetermined amount in the plane direction without receiving the weight of the bobbin around which the coil is wound, and the core is moved by the magnetic flux between the primary transformer and the secondary transformer by electromagnetic induction. Thus, the position can be properly corrected.

  According to the fourth aspect of the present invention, before charging the battery is started, the switch of the short circuit is turned on to increase the current flowing in the secondary coil. The movement is corrected to the position where the side transformer and the secondary transformer face each other, and charging with high efficiency can be performed without contact.

  According to the fifth aspect of the present invention, in a charging state in which power is supplied to the battery, the switch of the short circuit is turned off, there is no current flowing through the short circuit, and the power of the secondary coil is charged. The charging operation can be performed with high efficiency.

(A) is an overall side view showing a state of charge by parking an automobile using an electric motor as a drive source in a parking space having a power supply facility, and (b) is a secondary transformer on the automobile (moving body) side. FIG. The disassembled perspective view which shows the primary side transformer in the electric power feeding equipment side. It is a figure which shows a primary side trans | transformer, (a) is a top view, (b) is front sectional drawing, (c) is side sectional drawing. It is front sectional drawing which shows a primary side and a secondary side trans | transformer, (a) shows the state where the core of a primary side transformer and a secondary side transformer does not face directly, (b) shows the core of both transformers with magnetic flux. The state of facing directly is shown. The figure which shows the outline of the circuit of a non-contact charging device. The figure which shows the outline of the circuit of the non-contact charging device changed partially. The flowchart which shows the action | operation of the said non-contact charging device. The flowchart which shows the operation | movement which changed the said non-contact charging device partially.

  Hereinafter, a non-contact charging apparatus applied to a vehicle using an electric motor such as an electric vehicle or a plug-in hybrid vehicle as a driving source will be described with reference to the drawings. As shown in FIG. 1, the non-contact charging device 1 includes a power feeding facility 2 having a parking space 3 and the automobile 6 having a power receiving device 5. The automobile 6 has an electric motor (not shown), and the electric motor is an inverter using electric power from a rechargeable battery (battery) 7 such as a lithium ion battery or a nickel hydride battery mounted on the automobile 6. And so on.

  The power receiving device 5 includes a secondary transformer 8 disposed near the floor surface of the automobile 6, and a coil of the secondary transformer 8 is connected to the battery 7 via a rectifier 9 and a charger 10. Is conducting. The power supply facility 2 has a primary transformer 11 disposed on the running surface of the parking space 3, and a coil of the primary transformer 11 has a commercial AC power supply 12 as shown in FIGS. 5 and 6. Is converted into direct current by the AC / DC converter 13 and further supplied with power converted into high frequency by the inverter 15.

  As shown in FIG. 1B, the secondary-side transformer 8 is made of a non-magnetic material and has a bobbin 20 that is hollow and has flanges 20a formed at both ends. The coil 21 is wound around the outer peripheral surface between the portions 20a and 20a in an insulating manner, and the coil 21 is supplied with power from the inverter 15 as described above. A core (iron core) 22 made of a magnetic material passes through the hollow portion 20b of the bobbin 20 and is integrally fitted and fixed. The core 22 is formed of ferrite made of a ferromagnetic material, and is fixed to both ends of the first portion 22a having a longitudinal plate shape penetrating the hollow portion 20b of the bobbin 20, and the first portion. It consists of 2nd site | parts 22b and 22b which consist of a plate-shaped block piece extended in the direction orthogonal to the longitudinal direction of this site | part.

  The integrated bobbin 20, the coil 21, and the core 22 are housed and fixed integrally in a flat box-like case 25 that is thin in the vertical direction and wide in the plane direction. The case 25 includes a main body 25a made of a non-magnetic material and an upper lid 25b. The bobbin 20, the coil 21 and the core 22 are in close contact with each other between the main body 25a and the upper lid 25b. The vehicle is stored such that its longitudinal direction coincides with the longitudinal direction of the automobile 6. The secondary-side transformer 8 is disposed at the lower part of the automobile so that its wide plane is parallel to the floor surface of the automobile 6, that is, parallel to the traveling surface 3.

  As shown in FIGS. 2 and 3, the primary transformer 11 includes a bobbin 30 having a hollow portion 30 b, a coil 31, and a core 32, similar to the secondary transformer 8. The bobbin 30 is made of a non-magnetic material, and a coil 31 is wound around an outer periphery between the flanges 30a and 30a formed at both ends. The coil 31 is connected to the battery 7 to supply power. obtain. The core 32 is made of a ferromagnetic ferrite, and is fixed to both ends of the first portion 32a having a long plate shape penetrating the hollow portion 30b of the bobbin 30, and the first portion. It consists of 2nd site | parts 32b and 32b which consist of a plate-shaped block piece extended in the orthogonal direction. The first portion 32a of the core 32 and the hollow portion 30b of the bobbin 30 are in an insertion relation, but a predetermined gap S exists between them, and the core 32 has a longitudinal (front-rear) direction and a left-right width direction. And a predetermined amount of rotation (on a horizontal plane). That is, as detailed in FIG. 3C, there is a slight gap S1 in the vertical direction between the bobbin hollow portion 30b and the first portion 32a, and a relatively large gap S2 in the left-right direction. In addition, a gap S3 exists between the second portion 32b and the bobbin collar 30a. The core 32 may be slidably contacted with the bobbin hollow portion 30b in the vertical direction and supported movably. That is, the gap S1 in the vertical direction may not be provided, and the gap therebetween may be movable through a low friction coefficient coating such as a fluororesin.

  The bobbin 30, the coil 31, and the core 32 are accommodated in a box-shaped case 35 including a non-magnetic main body 35a and an upper lid 35b. The flange portions 30a and 30a of the bobbin 30 have a lower portion 30a1 that is longer than the upper portion, and the lower end of the lower portion 30a1 is in close contact with the bottom surface of the case body 35a and is fixed by adhesion or the like. A plurality of balls 36 serving as support members are held in a row at the lower ends of the left and right second portions 32b, 32b of the core 32, and these balls 36 roll to the bottom surface of the case body 35a. The core 32 is supported so as to be movable along the plane of the case 35. The support member is preferably one that can move smoothly in the plane direction, such as the ball 36 held by the core second portions 32b, 32b. However, the support member is not limited to this and may be a sliding member having a low friction coefficient. Alternatively, other rolling devices such as a cross slider and a roller may be used, or a ball spline that is movable only in the longitudinal direction with respect to the bobbin may be interposed.

  The case 35 is made of a non-magnetic material, has a flat rectangular shape that is thin in the vertical direction and wide in the plane direction, and is installed on the road surface (running surface) of the parking space 3 having the power supply facility 2 (FIG. 1A )reference). The case 35 of the primary transformer 11 is disposed between the wheels of the automobile so that the longitudinal direction of the core 33 coincides with the approach direction (front-rear direction, forward direction) of the automobile that puts the automobile 6 in the parking space. It arrange | positions so that it may be located in flat shape. The secondary transformer 8 is arranged so that the longitudinal direction of the core 22 is the front-rear direction of the automobile 6, and the primary transformer 11 is arranged so that the longitudinal direction of the core 32 is the entrance direction of the automobile. However, the present invention is not limited to this, and the width directions of the cores 22 and 32 may be arranged so as to coincide with the front-rear direction of the vehicle and the approach direction of the vehicle, respectively.

  5 and 6 are schematic block diagrams showing the non-contact charging device 1 including the power feeding facility 2 and the power receiving device 5. The power feeding facility 2 is taken out from the commercial AC power source 12, and the AC from the power source 12 is AC / DC. The converter 13 changes the direct current. Further, the direct current is converted into a high frequency by the inverter 15 and supplied to the coil 31 of the primary transformer 11. The power receiving device 5 receives power from the primary side transformer 11 to the secondary side transformer 8 by electromagnetic induction, the high frequency voltage generated in the coil 21 of the secondary side transformer 8 is converted into DC power by the rectifier 9, and the charger 10 is adjusted to charge the secondary battery 7. The block diagrams of FIGS. 5 and 6 are schematic diagrams showing only the basic structure. The direct current converted by the AC / DC converter 13 is measured by the ammeter 14a and the voltmeter 14b, and the power supplied to the primary transformer 11 is measured. In addition, an ammeter 24a and a voltmeter 24b are arranged between the rectifier 9 and the charger 10, and a direct current from the rectifier 9 is measured to measure electric power supplied to the charger 10.

  The electric vehicle or plug-in hybrid vehicle 6 that requires charging enters and parks in the parking space 3 where the predetermined power supply facility 2 is located. At this time, the secondary transformer 8 on the lower surface of the automobile 6 comes close to the primary transformer 11 of the power supply facility 2 so that the wide planes of the cases 25 and 35 face each other. Then, the driver of the automobile 6 transmits a charge request signal to the power supply facility 2. As a result, a high-frequency alternating current flows through the coil 31 of the primary transformer 11 and an alternating magnetic field is generated in the core 32. The magnetic flux J of the core 32 is supplied from the second parts 32b and 32b on both sides of the core 32 via the space (gap) G to the second parts 22b on both ends of the core 22 in the secondary-side transformer 8. , 22b to be magnetically coupled. The secondary transformer 8 generates AC power in the coil 21 due to the magnetic flux of the core 22, and the induced AC power is converted into DC by the rectifier 9, and further supplied to the battery 7 via the charger 10, The secondary battery 7 is charged.

  At this time, it is difficult for the automobile 6 to park directly against the secondary transformer 8 when entering the parking space 3. Specifically, as shown in FIG. 4 (a), the second portion 32b of the core 32 of the primary transformer 11 and the second portion 22b of the core of the secondary transformer 8 are accurately arranged in the front-rear direction, the left-right width direction, and It is difficult to accurately match the rotation direction (automobile approach direction) on the plane. In the present invention, the primary transformer 11 and the secondary transformer can be moved even when the vehicle approach is shifted from the regular position by a predetermined amount in the front-rear direction position, the left-right width direction position, and the approach angle. The cores 32 and 22 of both transformers receive a force in a direction in which the magnetic flux lines J in the space G between the transformers 8 and 8 become shorter.

  Here, the secondary transformer 8 is fixed to the case 25, that is, integrally fixed to the automobile 6, but the core 32 of the primary transformer 11 is separated from the bobbin 30 integrated with the case 35 by the gap S ( S1, S2, S3) are supported by the ball 35 so as to be movable in the plane direction. Accordingly, the core 32 of the primary transformer 11 is attracted by the magnetic flux line J, and the primary transformer 11 is connected to the second portions 22b and 22b of the core of the secondary transformer 8 as shown in FIG. The core 32 automatically moves so that the second portions 32b and 32b of the core face each other. That is, the core 32 can be moved without being fixed by the vertical gap S1 between the bobbin hollow portion 30b and the core 32, and the core 32 can be moved in the front-rear direction by the gap S3 between the bobbin collar 30a and the second portion 32b. And the left and right gaps S2 between the bobbin hollow portion 30b and the core 32 are moved in the left-right width direction, and the cores 32 are rotated in a plane by the larger gaps S2 and S3, so that the secondary transformer The core 32 of the primary transformer 11 faces the eight cores 22 so as to coincide with the front-rear direction and the left-right width direction and to be parallel to the rotation direction. Thereby, even if the predetermined space G exists between the primary transformer 11 and the secondary transformer 8, electric power is supplied with high efficiency.

  Note that a predetermined space G is interposed between the primary transformer 11 and the secondary transformer 8, and the magnetic flux J is a high-frequency AC magnetic field based on the high-frequency AC power of the coils 31 and 21, so that the primary-side transformer The eleven cores 32 are not lifted by the magnetic force against the gravity. Further, the movement range of the core 32, in particular, the movement in the longitudinal direction (front-rear direction) of the first portion 32a is regulated by the side end of the second portion 32b of the core coming into contact with the case 35. The second portion 32b does not come into contact with the flange portion 30a of the bobbin 30. Thereby, the fixing of the bobbin 30 with the case 35 is sufficient by simple fixing means such as adhesion. Not only the movement of the core 32 in the front-rear direction but also the movement in the left-right width direction and the rotation direction may be restricted by the second portion 32b of the core contacting the case 35. .

  Next, a short circuit in the power receiving device 5 that is a main part of the present invention will be described with reference to FIGS. 5 and 6.

  In FIG. 5, a short circuit 40 in which a switch A and a resistor R are connected in parallel is interposed between the secondary transformer 8 and the rectifier 9. In FIG. 6, a short circuit 40 in which a switch B and a resistor R are connected in parallel is interposed between the rectifier 9 and the charger 10. In either case, by connecting the short circuit (switch A or B and resistor R) 40 between the secondary transformer 8 and the charger 10 in parallel, the resistance of the secondary circuit becomes smaller than that during charging. For this reason, the current of the secondary transformer increases more than that during charging, and the current of the primary transformer 11 increases accordingly. Therefore, as the current increases, the magnetic densities of both the primary and secondary cores 22 and 23 also increase, and the attractive force of both cores in the space G increases compared to when charging.

  Thus, the core 32 of the primary transformer 11 can be quickly moved so as to face the core 22 of the secondary transformer 8, and position correction can be performed in a short time. Further, since the core 32 of the primary transformer can be moved with a large force, the position of the primary core can be corrected even when the positional deviation between the two transformers is large or when the movement of the primary transformer is awkward.

  The operation of the charging apparatus having the short circuit 40 will be described with reference to FIG. The driver parks the vehicle 6 in the parking space 3 where the power supply facility 2 is located, and issues a charge request signal (preparation for starting secondary charging; S1). In response to the charge request signal, first, the switch A or B of the short circuit 40 is turned on (S2), and power is supplied from the power source 13 to the primary transformer 11, and as described above, through the adjacent space G. Thus, a magnetic flux circuit is formed between the cores 32 and 33 of the primary transformer 11 and the secondary transformer 8. (Primary side power supply start; S3)

  At this time, when the switch A or B is turned on, a larger current flows through the coil 21 of the secondary transformer 8 than during charging due to the connection through the short circuit 40. Thereby, also in the primary side transformer 11 by electromagnetic coupling, a large current flows through the coil 31, the magnetic flux density passing through the space G increases, and the force with which the cores 22 and 23 are attracted through the space also increases.

  Due to the attracting force, the core 32 of the primary-side transformer 11 moves in the plane direction and comes close to the power supply efficiency. The power supply amount of the power supply facility 2 is compared with the power received amount of the power receiving device 5 to determine whether the power supply efficiency is equal to or higher than the set value ε% (S4). The set time Tsec is held in the primary power supply start state (S5). When the power supply efficiency is determined to be equal to or greater than the set value ε% and when the value is equal to or greater than the set value ε% within the set time Tsec, it is determined that the preparation for charging is complete and the primary power supply is temporarily turned off (S6). ). If the power supply efficiency does not exceed the predetermined value ε% or more for a predetermined time Tsec or more (S5; yes), the charging operation is stopped as an error and a warning is given to the driver (S10).

  When the core 32 of the primary-side transformer 11 is properly corrected in position and ready for charging, the switch A or the switch B of the short circuit 40 is turned off (S7). Then, the primary side power supply is started again (S8), the secondary side charging is started (S9), and electric power is supplied from the primary side transformer 11 to the secondary side transformer 8 through the adjacent space by electromagnetic induction. A secondary battery 7 such as an ion battery is charged.

  FIG. 8 shows an embodiment in which a part of FIG. 7 is changed. Only steps 4, 5, and 10 are different, and the others are the same, so only the difference will be described. The switch A or B is turned on, the short circuit 40 is connected, and the correction movement is performed so that the core 32 of the primary transformer 11 faces the core 22 of the secondary transformer 8 by a set time Tsec and strong magnetic field lines. . When a predetermined set time Tsec elapses (S11), it is determined that the preparation for charging is complete, and the primary power supply is turned off (S6). That is, when the time Tsec required for position correction of the core 32 of the primary transformer 11 elapses due to the above-described strong magnetic field lines, the cores 32 and 22 of both the transformers 11 and 8 are corrected to positions sufficiently close to each other and ready for charging. Is determined to be in place.

  In the embodiment described above, the ball 32 as a support member is interposed between the case 35 and the core 32 so that the core 32 can be moved in the plane direction. The core may be movably supported by interposing a ball or a low friction material in the gap S with the part 32a. Although the core 32 is moved only in the plane direction by the magnetic force, the core can be moved up and down by a predetermined amount with respect to the bobbin, or the case 35 can be moved up and down by a predetermined amount, and the primary core is moved up and down by a predetermined amount. It may also be moved in the direction so that it is closer to the secondary core.

  Further, in the above-described embodiment, the core 32 of the primary transformer 11 is movable, but on the contrary, the primary core 32 is fixed integrally to the case 35 and the secondary core 22 is movable. As such, the position of the secondary core 22 may be corrected with respect to the primary core 32.

  In the above-described embodiment, the bobbin is fixed to the case and only the core is movable so that the weight of the coil and bobbin does not hinder the movement of the core. However, the core, bobbin and coil are moved together. However, you may move with the case which accommodated these again. Further, the embodiment has been described in which the movement correction is made to the position where both transformers are directly opposed by the increased magnetic flux density. However, the present invention is not limited to this, and is applied to detection of an appropriate position (coordinates) by the increased magnetic flux density and other uses. Also good.

DESCRIPTION OF SYMBOLS 1 Contactless charging device 2 Electric power feeding equipment 3 Parking space 5 Power receiving device 7 Battery 8 Secondary side transformer 9 Rectifier 10 Charger 11 Primary side transformer 12 AC power source 13 AC / DC converter 20 Bobbin 20b Hollow part 21 Coil 22 Core 25 Case 30 Bobbin 30b Hollow part 31 Coil 32 Core 40 Short circuit A, B Switch G Space J Magnetic flux (line)

Claims (6)

A primary side transformer having a primary side coil supplied with power from an AC power source, a bobbin around which the primary side coil is wound, and a core made of a magnetic material;
A secondary-side transformer having a secondary-side coil that supplies power to a battery disposed in the moving body, a bobbin around which the secondary-side coil is wound, and a core made of a magnetic body,
Magnetic flux generated in the core of the primary transformer by energization of the primary coil is transmitted to the core of the secondary transformer through space, and induced AC power of the secondary coil is supplied to the battery. In a contactless charging device that is charged,
Between the secondary coil and the charger that charges the battery, a short circuit that is short-circuited via a switch is disposed in parallel.
A non-contact charging device. The moving body is an automobile having an electric motor as a drive source, and the secondary transformer is disposed near a floor surface of the automobile;
The primary transformer is provided in a power supply facility and disposed in a space where the automobile can be parked,
At least one of the primary transformer and the secondary transformer is supported movably,
When the switch is turned on, the primary-side transformer and the secondary-side transformer are arranged in a direction in which the primary-side transformer and the secondary-side transformer are opposed to each other by magnetic flux generated in the space based on the current of the secondary-side coil that flows via the short circuit. And moving at least one of the secondary transformers,
The contactless charging apparatus according to claim 1. The primary-side transformer and the secondary-side transformer are housed in a flat box-type case wide in the plane direction with respect to the vertical direction,
In the secondary transformer, the core is integrally fixed to the bobbin, and the bobbin and the core are fixed to the case.
In the primary transformer, the bobbin is fixed to the case, and the core is supported via a support member that is movable in the plane direction of the bobbin with a predetermined gap interposed therebetween,
The core of the primary transformer is moved in the plane direction so that the length of the magnetic flux lines in the space with the core of the secondary transformer is shortened.
The non-contact charging device according to claim 2. Before charging the battery is started, the switch of the short circuit is turned on to increase the current flowing in the secondary coil,
The non-contact charging device according to any one of claims 1 to 3. In a charging state in which power is supplied from the secondary coil to the battery via the charger, the short circuit is switched off.
The non-contact charging device according to any one of claims 1 to 4. A secondary-side transformer having a secondary-side coil that supplies power to a battery disposed in the moving body, a bobbin around which the secondary-side coil is wound, and a core made of a magnetic material;
Magnetic flux generated in the core of the primary transformer by energization of the primary coil is transmitted to the core of the secondary transformer through the space, and AC power induced in the secondary coil is passed through the rectifier and the charger. In the power receiving device that is supplied to the battery,
Between the secondary coil and the charger, a short circuit that is short-circuited via a switch is arranged in parallel.
A power receiving device.

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