JP2018201289A - Non-contact power transmission device - Google Patents

Abstract

To provide a non-contact power transmission device for an operator who performs connection work of a power transmission unit to easily adjust an output level at hand.SOLUTION: A non-contact power transmission device 1 includes first and second power transmission units 10, 20 for transmitting electric power at least from one side to the other side, and a frame 30 in which the second power transmission unit 20 is fixedly accommodated and that removably accommodates the first power transmission unit 10 to perform positioning of the first power transmission unit 10 relative to the second power transmission unit 20 and fix it. The frame 30 includes a lock mechanism 35 for fixing a position of the first power transmission unit 10 inserted into the frame 30. A fixed position of the first power transmission unit 10 is configured into multiple stages relative to an insertion direction. An output level of the power transmission unit 20 at a power receiving side varies in accordance with an amount of slide in the insertion direction of the first power transmission unit 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a contactless power transmission device, and more particularly, to an alignment structure between a power transmission unit and a power reception unit.

  A non-contact power transmission technique that transmits power without using a power cable or a power cord has attracted attention. Non-contact power transmission technology can supply power from the power transmission side to the power receiving side while maintaining an electrically non-contact state. Therefore, transportation equipment such as trains and electric cars, home appliances, electronic devices, wireless communication devices, toys, Application to various products such as industrial equipment is expected.

  Regarding the non-contact power transmission technology, for example, Patent Document 1 describes a non-contact power feeding coupler configured to perform power transmission in an electrically non-contact manner from a primary side to a secondary side. This non-contact power supply coupler consists of a primary side magnetic unit and a secondary side magnetic unit corresponding to the primary coil and secondary coil of the transformer, and is in an electrically non-contact state by magnetically coupling the two units. The AC power can be transmitted while maintaining the power. Further, the primary side core of the primary side magnetic unit has a cross section having a flange portion and a column portion formed in a substantially T shape, and a rod-shaped guide portion having a diameter smaller than that of the column portion at the tip of the column portion. Are attached so as to protrude coaxially. The secondary side core of the secondary side magnetic unit is formed in a saddle shape so that a closed magnetic circuit can be formed together with the primary side core, and the length of the guide portion of the primary side core is larger than the depth of the saddle type core. Since the guide hole for guiding the insertion of the guide portion is provided in the center of the bottom surface of the saddle-shaped core, even a non-expert can easily and conveniently operate.

  Patent Document 2 describes a wireless power feeding system that can securely connect and hold a charging connector to a power receiving connector while maintaining high charging efficiency. This wireless power supply system includes a charging connector, which is an inlet type connector, and a power receiving connector to which the charging connector is connected. When the connector body of the charging connector is inserted into the insertion portion of the power receiving connector Since the power transmission unit (power transmission coil) disposed on one end of the connector body faces the power reception unit (power reception coil) disposed on one end surface of the power reception main body of the power reception connector, the power reception unit receives power from the power transmission unit. It is possible to transmit power wirelessly.

Japanese Patent No. 3864094 JP, 2006-73016, A

  In the non-contact power transmission technology, the connection terminal does not need to be exposed to the outside, and there is no problem of deterioration such as corrosion of the connection terminal. Therefore, the contactless power transmission technique is preferably used even in a fouling environment where a lot of moisture, oil, etc. are present. However, when dimming the LED lighting connected to the power receiving unit in a polluted environment or changing the output of the motor, the power supply unit installed in a machine room far away from the work area in the polluted environment In order to change the power supply voltage, the operating frequency, the pulse width, etc., the worker has to move out of the contaminated environment area, and there is a problem that workability is poor. Although the case where the power output is changed by a remote control or the like is also conceivable, an expensive remote control with a waterproof and dustproof structure is required, and detailed operation of the remote control button is also required, so workability is poor. Therefore, there is a problem that it is not possible to easily perform dimming or the like of LED lighting that regularly moves indoors and outdoors in a polluted environment.

  Accordingly, an object of the present invention is to provide a non-contact power transmission device that allows an operator who performs connection work of a power transmission unit to easily adjust the output level at hand.

  In order to solve the above-described problem, a contactless power transmission device according to the present invention includes first and second power transmission units that transmit power from at least one to the other in a contactless manner, and the second power transmission unit includes: A frame that is fixedly housed and removably accommodates the first power transmission unit, and the frame includes a lock mechanism that fixes a position of the first power transmission unit inserted into the frame. And the fixed position of the first power transmission unit is configured in multiple stages with respect to the insertion direction, and the power on the power receiving side depends on the amount of sliding of the first power transmission unit in the insertion direction. The output level of the transmission unit changes.

  According to the present invention, when the first power transmission unit is inserted into the frame, the output level on the power receiving side can be changed by a simple method only by changing the slide amount, and a complicated mechanism for changing the output level is obtained. Is absolutely unnecessary. Therefore, an operator who works in a fouling environment can easily adjust the output level on the power receiving side at hand, and can provide a highly convenient non-contact power transmission apparatus with an inexpensive configuration.

  In the present invention, it is preferable that the first power transmission unit has a plurality of convex portions or concave portions, and the lock mechanism engages with any of the plurality of convex portions or concave portions. Since a plurality of convex portions or concave portions for positioning in the insertion direction are provided on the first power transmission unit side, the output level on the power receiving side can be changed by a simple method of changing the slide amount. In particular, since the convex portion or the concave portion provided in the first power transmission unit can be easily formed by a mold even if it is not constituted by a separate part, a multistage locking mechanism can be manufactured at low cost.

  In this invention, it is preferable that the cross-sectional shape of the said convex part or a recessed part is serrated. Since the convex portion or the concave portion provided in the second power transmission unit can be easily formed with a mold without being constituted by separate parts, the lock mechanism can be manufactured at low cost. Further, by forming the serrated irregularities, it is possible to easily set the output level finely.

  In this invention, it is also preferable that the cross-sectional shape of the said convex part or a recessed part is a wave shape. Since the convex portion or the concave portion provided in the second power transmission unit can be easily formed with a mold without being constituted by separate parts, the lock mechanism can be manufactured at low cost. Further, by forming the wavy uneven portion, it is possible to easily set the output level finely.

  In the present invention, the frame supports the upper frame facing the first power transmission unit housed in the frame, supports the upper frame, and the first power transmission unit into the frame. A side frame that guides insertion, and the locking mechanism includes a leaf spring portion formed on the upper frame, and a claw portion formed on a distal end portion of the leaf spring portion. It is preferable that the first power transmission unit housed in the frame is engaged with any one of the plurality of convex portions or concave portions. As a result, the lock mechanism of the first power transmission unit can be realized with a simple configuration, and the first power transmission unit can move the second power by the spring-like pressing force by the leaf spring portion. Since it is pressed against the transmission unit, each power transmission unit can be brought into close contact stably.

  In the present invention, it is preferable that the frame has a first opening that constitutes an insertion port of the first power transmission unit, and a second opening that is located on the opposite side of the first opening. . In this case, the second opening may constitute an insertion port of the first power transmission unit together with the first opening. According to this configuration, the foreign matter that has entered the frame from the first opening is easily discharged from the second opening, and the foreign matter is unlikely to accumulate in the frame. Even if a foreign substance enters the frame, it is easy to clean the frame through the first opening or the second opening. Accordingly, the foreign matter accumulated in the frame interferes with the first power transmission unit, causing a positional shift between the first power transmission unit and the second power transmission unit, or the first power transmission unit and the second power transmission unit. It is possible to prevent a reduction in power transmission efficiency due to a decrease in the degree of magnetic coupling between the two due to a decrease in the degree of close contact between the power transmission unit and a decrease in the degree of adhesion between the two (the distance between the coils increases). it can.

  In the present invention, the first power transmission unit includes a power transmission coil that transmits power, a power transmission circuit board on which a power transmission circuit that drives the power transmission coil is mounted, a power transmission coil and a power transmission circuit board that house the power transmission circuit board. The second power transmission unit is mounted with a power receiving circuit including a power receiving coil that receives power and a rectifying / smoothing circuit that converts AC power from the power receiving coil into DC power. It is preferable that the power receiving unit includes a received power circuit board and a second case that houses the power receiving coil and the power receiving circuit board. As described above, since all the parts necessary for configuring the power transmission unit on the power transmission side or the power reception side are packaged in one case, it is easy to handle the power transmission unit in a polluted environment. In addition, the reliability of the power transmission unit can be improved. Further, the output level of the power receiving unit can be changed by a simple method of changing the slide amount of the power transmission unit, and no complicated mechanism for changing the output is required. Therefore, an operator who connects power transmission units in a polluted environment can easily adjust the power level on the power receiving side at hand, and provides a highly convenient non-contact power transmission device with an inexpensive configuration. Can do.

  According to the present invention, it is possible to provide a non-contact power transmission device in which an operator who connects power transmission units can easily adjust the output level at hand.

FIG. 1 is a schematic perspective view showing the structure of a non-contact power transmission apparatus according to a first embodiment of the present invention. 2A and 2B are diagrams illustrating a basic structure of the power transmission unit 10 or the power reception unit 20, where FIG. 2A is a plan view and FIG. 2B is a side cross-sectional view taken along line AA ′ in FIG. FIG. 3 is a side sectional view showing a state in which the power transmission unit 10 and the power reception unit 20 are combined. FIG. 4 is a schematic perspective view of the non-contact power transmission device 1, particularly a perspective view seen from the insertion direction (Y1 direction) of the power transmission unit 10. FIG. 5 is a schematic perspective view of the non-contact power transmission device 1, particularly a perspective view as seen from the direction (Y2 direction) opposite to the insertion direction (Y1 direction) of the power transmission unit 10. 6A to 6C are schematic side sectional views for explaining the connection operation of the power transmission unit 10 to the power receiving unit 20. FIGS. 7A and 7B are schematic side cross-sectional views for explaining the connection operation of the power transmission unit 10 together with FIG. FIGS. 8A and 8B are schematic side cross-sectional views for explaining the connection operation of the power transmission unit 10 together with FIGS. 6 and 7. FIGS. 9A and 9B are schematic cross-sectional views showing modifications of the lock mechanism. FIG. 10 is a schematic perspective view showing the structure of the non-contact power transmission apparatus according to the second embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view showing the structure of a non-contact power transmission apparatus according to a first embodiment of the present invention.

  As shown in FIG. 1, the non-contact power transmission device 1 includes a power transmission unit 10 that transmits power in a contactless manner, a power reception unit 20 that receives power in a contactless manner, and a power reception unit 20 that is fixedly accommodated. In addition, the power transmission unit 10 is detachably accommodated, and a frame 30 that aligns and fixes the power transmission unit 10 with respect to the power reception unit 20 is provided.

  The power transmission unit 10 and the power reception unit 20 are power transmission units in which a power transmission coil and a drive circuit board thereof are accommodated in one case and packaged. The power transmission unit 10 has a power transmission circuit such as a power transmission coil and an inverter for transmitting power, and the power supplied to the power transmission unit 10 from the external DC power source via the power cable 15A is converted into AC power by the power transmission circuit. Then, the power is supplied to the power transmission coil, and AC power is output as electromagnetic energy from the power transmission coil. The power receiving unit 20 has a power receiving circuit such as a power receiving coil that receives power from the power transmitting coil and a rectifying and smoothing circuit. The AC power received by the power receiving unit 20 is converted into DC power by the rectifying and smoothing circuit in the power receiving circuit. After being converted to, it is supplied to a load such as an LED via the power cable 15B.

  The frame 30 has a connector structure for mechanically connecting the power transmission unit 10 and the power reception unit 20, and is integrated with the frame 30. The power transmission unit 10 is attached to the power reception unit 20 via the frame 30 and can be easily detached from the power reception unit 20. As described above, the power receiving unit 20 integrated with the frame 30 is mechanically connected to the power transmission unit 10, but constitutes a connector without contact with the power transmission unit 10. By fixing the power transmission unit 10 at a position facing the power reception unit 20, the power transmission efficiency from the power transmission unit 10 to the power reception unit 20 can be increased.

  The frame 30 includes a first opening 30A that constitutes an insertion port of the power transmission unit 10 and a second opening 30B that is located on the opposite side of the first opening 30A. The power transmission unit 10 can be inserted into the frame 30 from the Y1 direction (first direction) in which the first opening 30A is provided. The frame 30 is provided with a lock mechanism 35 that fixes the position of the power transmission unit 10 inserted into the frame 30 from the first opening 30A.

  The schematic shapes of the power transmission unit 10 and the power reception unit 20 are the same. In particular, the power transmission unit 10 is easily positioned with respect to the power reception unit 20 because they are line symmetric and rotationally symmetric in plan view. In addition, cases having the same shape and size are used for the power transmission unit 10 and the power reception unit 20, and cost reduction is achieved by sharing components.

  In the present embodiment, the planar shape of the power transmission unit 10 and the power reception unit 20 is a rectangle, and the width in the Y direction is wider than the width in the X direction. On the other hand, the planar shape of the frame 30 is substantially square as shown in FIG. 1, and the width in the Y direction is substantially equal to the width in the X direction.

  2A and 2B are diagrams illustrating a basic structure of the power transmission unit 10 or the power reception unit 20, where FIG. 2A is a plan view and FIG. 2B is a side cross-sectional view taken along line AA ′ in FIG.

  2A and 2B, the basic structures of the power transmission unit 10 and the power reception unit 20 are the same, and the power transmission coil 11 and the circuit board 12 connected to the power transmission coil 11; A thin case 13 for housing the power transmission coil 11 and the circuit board 12 is provided. In the power transmission unit 10, the power transmission coil 11 is a power transmission coil 11A (first coupling element), and the circuit board 12 is a power transmission circuit board 12A on which a power transmission circuit such as an inverter for driving the power transmission coil 11A is mounted. . In the case of the power receiving unit 20, the power transmission coil 11 is a power receiving coil 11B (second coupling element), and the circuit board 12 is a power receiving circuit such as a rectifying and smoothing circuit that converts AC power from the power receiving coil 11B into DC power. Is a power receiving circuit board 12B mounted.

  The power transmission coil 11 is disposed closer to the bottom surface of the case body 13 a than the circuit board 12, and the circuit board 12 is disposed closer to the lid 13 b (closer to the upper surface) of the case 13. The power transmission coil 11 is a spiral coil that is spirally wound around the main surface of the support substrate 14. The support substrate 14 of the power transmission coil 11 is preferably made of a magnetic material. In this case, the power transmission coil 11 is disposed on the bottom surface side of the case body 13 a with respect to the support substrate 14. By using a magnetic sheet or a thin magnetic substrate as the magnetic core of the power transmission coil 11 and arranging the magnetic core closer to the circuit board 12 than the power transmission coil 11, the magnetism on the surface opposite to the feeding direction is shielded (suppressed). can do.

  The center position of the power transmission coil 11 is preferably set at the center of the case 13. Thereby, only by matching the center position of the case 13 of the power transmission unit 10 with the center position of the case 13 of the power receiving unit 20, the pair of power transmission coils 11 can be completely overlapped to maximize the degree of magnetic coupling between them. . Since the offset amount of the pair of power transmission coils 11 also changes in accordance with the offset amount of the power transmission unit 10 with respect to the power receiving unit 20, it is easy to adjust the degree of magnetic coupling between the pair of power transmission coils 11.

Although details will be described later, first to third convex portions 13d _{1 to} 13d ₃ and a stopper 13s are formed on the upper surface of the lid 13b of the case 13. The first to third convex portions 13 d _{1 to} 13 d ₃ and the stopper 13 s are provided for positioning and fixing the power transmission unit 10 set on the frame 30. The stopper 13s is used as a knob portion when the power transmission unit 10 is pulled out from the frame 30. The first convex portion 13d ₁ is intended to be used when the offset amount with respect to the power receiving unit 20 of the power transmission unit 10 fixes the power transmission unit 10 in the most larger first fixed position, the second convex portion 13d ₂ Is used when the power transmission unit 10 is fixed at the second fixed position where the offset amount with respect to the power receiving unit 20 is smaller than that at the first fixed position, and the third convex portion 13d ₃ This is used when the power transmission unit 10 is fixed at the third fixed position where the offset amount of the unit 10 with respect to the power receiving unit 20 becomes zero. The number of protrusions and the pitch are not particularly limited, and can be set as necessary.

  FIG. 3 is a side sectional view showing a state in which the power transmission unit 10 and the power reception unit 20 are combined.

  As shown in FIG. 3, in a state where the power transmission unit 10 is inserted into the frame 30 and combined with the power reception unit 20, the bottom surfaces of the case 13 of the power transmission unit 10 and the power reception unit 20 face each other. Since the power receiving coil 11B is disposed in close proximity to each other, both can be magnetically coupled. Since the magnetic flux generated from the power transmission coil 11A is linked to the power reception coil 11B, power can be supplied from the power transmission unit 10 to the power reception unit 20 in a non-contact manner. In the case of the contact power supply method in which the power transmission unit 10 and the power receiving unit 20 are directly electrically connected, the connection terminal is exposed to the outside, so that the connection terminal is deteriorated in a polluted environment where a large amount of moisture (humidity) or oil is present. In the case where the power transmission unit 10 is frequently inserted and removed, the connection terminal is significantly deteriorated. However, in the present embodiment, power is transmitted from the power transmission unit 10 to the power receiving unit 20 while maintaining an electrically non-contact state, so that there is no problem of deterioration of the connection terminals, and the durability of the power transmission unit is maintained even in a fouling environment. And reliability can be ensured.

  4 and 5 are schematic perspective views of the non-contact power transmission apparatus 1. In particular, FIG. 4 is a perspective view seen from the insertion direction (Y1 direction) of the power transmission unit 10, and FIG. 5 is a direction opposite to FIG. It is the perspective view seen from (Y2 direction).

  As shown in FIGS. 4 and 5, the frame 30 according to the present embodiment is made of resin, a flat upper frame 31 that constitutes the upper surface of the frame 30, side frames 32 and 33 that support the upper frame 31, A bottom frame 34 constituting the bottom surface of the frame 30. In the present embodiment, the side frames 32 and 33 constitute left and right side walls that are parallel to each other and cover the outer sides of the two side surfaces parallel to the longitudinal direction of the power receiving unit 20. It also functions as a guide member that guides insertion.

  The upper frame 31 faces the power receiving unit 20 in the frame 30 with the accommodation space for the power transmission unit 10 interposed therebetween, and faces the lid 13 b of the power transmission unit 10 when the power transmission unit 10 is accommodated in the frame 30. A first opening 30A and a second opening 30B are provided on two side surfaces orthogonal to the side frames 32, 33. The internal space of the frame 30 is an upper and lower housing space of the power transmission unit, the power receiving unit 20 is always housed in the lower space, and the power transmission unit 10 is detachably housed in the upper space.

  30 A of 1st opening parts comprise the insertion port of the power transmission unit 10, and have the opening shape which can insert the power transmission unit 10. FIG. In particular, flange portions 32f and 33f are respectively formed on the end surfaces of the side frames 32 and 33 on the first opening 30A side, and guide grooves 30g are formed by notching portions of the flange portions 32f and 33f. ing. The flange portions 32f and 33f interfere with the end portion 13g of the lid 13b protruding on both sides in the width direction of the case 13 of the power transmission unit 10, but the lid 13b is inserted by adjusting the height of the lid 13b to the position of the guide groove 30g. The power transmission unit 10 can be inserted into the case 13 while avoiding interference between the flange 13b and the flange portions 32f and 33f. In this case, the end portion 13g of the lid 13b of the case 13 of the power transmission unit 10 functions as a guide rail, and the end portion 13g of the lid 13b of the case 13 of the power transmission unit 10 is fitted in the guide groove 30g to the power receiving unit 20. Position alignment of the power transmission unit 10 in the width direction (X direction) and the height direction (Z direction) can be reliably performed.

  The second opening 30B is almost the same size as the first opening 30A, but does not constitute an insertion port of the power transmission unit 10 and is provided to prevent foreign matter from accumulating in the frame 30. ing. Flange portions 32f and 33f are also formed on the end surfaces of the side frames 32 and 33 on the second opening 30B side, but the guide grooves 30g are not formed. For this reason, the end 13g of the lid 13b of the case 12 of the power transmission unit 10 always interferes with the flange portions 32f and 33f, and the power transmission unit 10 cannot be inserted from the second opening 30B. As described above, the flange portions 32f and 33f on the second opening 30B side of the side frames 32 and 33 serve as members that obstruct the insertion of the power transmission unit 10 from the second opening 30B and transmit power. When the unit 10 is inserted from the first opening 30A, it also serves as a stopper and can be prevented from falling off the frame 30.

When the side frames 32 and 33 are formed of the same member, a guide groove 30g is formed on the end surface on the second opening 30B side, but the rear end of the case body 13a of the power transmission unit 10 in the Y direction. may have is provided projection 13f ₁ for positioning the, also the second to a rear end portion of the Y-direction of the case body 13a of the power receiving unit 20 is located in the opening portion 30B side projection 13f ₂ for positioning It may be provided. In this case, it is preferable that the recess 13h ₁ corresponding to the projection 13f ₁ is formed in the case body 13a of the power receiving unit 20, corresponding to the protrusion 13f ₂ in the case body 13a of the power transmission unit 10 recess (not shown) Is preferably formed. The power transmission unit 10 is inserted into the frame 30 from the first opening 30A, the power transmission unit 10 reaches just above the power receiving unit 20, the projection 13f ₁ of the power transmission unit 10 side recess of the case body 13a of the power receiving unit 20 with fitted to 13h _1, since the projections 13f ₂ of the power receiving unit 20 side is fitted into the recess of the case body 13a of the power transmission unit 10, to prevent falling off from the frame 30 to securely lock the power transmission unit 10 Can do.

The upper frame 31 of the frame 30 is provided with a lock mechanism 35 that locks the power transmission unit 10 inserted into the frame 30 from the first opening 30A. The lock mechanism 35 is formed by cutting the upper frame 31 into a substantially U shape in plan view to form a leaf spring portion, and providing a downward claw portion at the tip of the leaf spring portion. By engaging the claw portion of the lock mechanism 35 in any one of the first to third convex portions 13d provided on the upper surface ₁ ～13D ₃ of the power transmission unit 10, it is possible to fix the power transmission unit 10.

  6-8 is a figure for demonstrating the connection operation | movement of a power transmission unit.

As illustrated in FIG. 6A, when the power transmission unit 10 is inserted into the frame 30 from the first opening 30 </ b> A, the power transmission unit 10 moves forward along the guide groove 30 g and is provided on the upper surface of the power transmission unit 10. The convex portion 13d gradually approaches the claw portion 37. As shown in FIG. 6B, when the first convex portion 13d ₁ comes into contact with the claw portion 37, the claw portion 37 and the leaf spring portion 36 are pushed upward by the first convex portion 13d ₁ , and the leaf spring The part 36 is elastically deformed. At this time, the power transmission coil 11A of the power transmission unit 10 and the power reception coil 11B of the power reception unit 20 start to be magnetically coupled with a low degree of coupling.

As shown in FIG. 6 (c), it is slid to the power transmission unit 10 further back, after the pawl portion 37 passing over the first protrusion 13d _1, is pushed downward by the elastic force of the plate spring portion 36 the first convex portion 13d ₁ fits into the groove between the second protrusion 13d _2, engages with the first protrusion 13d _1. In this way, the power transmission unit 10 is fixed to the frame 30 at a position facing the power reception unit 20, and the power transmission coil 11A of the power transmission unit 10 and the power reception coil 11B of the power reception unit 20 can be magnetically coupled. However, this first fixed position, since the offset amount _{d 1} is larger for the coil axis _{C B} of the power receiving coil 11B of the coil axis _{C A} of the power transmission coil 11A, the output level _{P 1} of the power receiving unit 20 is minimized.

Next, as shown in FIG. 7 (a) and (b), when the sliding further into the power transmission unit 10, after the pawl portion 37 gets over the second convex portion 13d _2, the second convex portion 13d ₂ and fitted into the groove between the third protrusions 13d _3, engages a second protrusion 13d _2. In this second fixed position, the offset amount d ₂ relative to the coil axis C _B of the power receiving coil 11B of the coil axis C _A of the power transmission coil 11A is smaller than the offset amount d ₁ when the first fixed position, the power receiving output level _{P 2} of the unit 20 is larger than the output level _{P 1 (P 2> P 1} ).

Next, as shown in FIG. 8 (a) and (b), when the sliding to the power transmission unit 10 deeper, the claw portion 37 gets over the third protrusion 13d _3. At this time, the end face 30e of the frame 30 (the end face of the upper frame 31) abuts against a stopper 13s provided on the upper surface of the power transmission unit 10, and the further insertion of the power transmission unit 10 is prevented. engage in the convex portion 13d _3, the power transmission unit 10 is fixed to the frame 30. In the third fixing position, the power transmission unit 10 is completely overlapped with the power receiving unit 20, the offset amount with respect to the coil axis C _B of the power receiving coil 11B of the coil axis C _A of the power transmission coil 11A is zero. Therefore, the output level _{P 3} of the third power receiving unit 20 at a fixed position is maximum, it becomes greater than the output level _{P 2 (P 3> P 2} > P 1).

In addition, what is necessary is just to pull up the projection part 38 provided above the nail | claw part 37, when releasing the lock | rock of the power transmission unit 10 and the power receiving unit 20. FIG. Thus the claw portion 37 is lifted together with the plate spring portion 36, the engagement between one of the claw portions 37 and the convex portions _13d 1 _{~13d 3} is released. Accordingly, the power transmission unit 10 can be unlocked and taken out from the frame 30.

  FIGS. 9A and 9B are schematic cross-sectional views showing modifications of the lock mechanism.

  As shown to Fig.9 (a), the cross-sectional shape of a multistage uneven | corrugated | grooved part may be a sawtooth shape as shown to Fig.9 (a). The inclined portion of the sawtooth-shaped convex portion 13d is formed in a straight line and has a triangular sawtooth shape. According to this configuration, fine adjustment of the fixed position of the power transmission unit 10 is easy, and thereby the output level of the power reception unit 20 can be finely adjusted.

  Moreover, as shown in FIG.9 (b), as for a locking mechanism, the cross-sectional shape of a multistage uneven | corrugated | grooved part may be wavy. The convex portion of one wave is formed in a semicircular shape, and the tip portion of the claw portion 37 engaged with the convex portion 13d is also substantially semicircular. According to this configuration, fine adjustment of the fixed position of the power transmission unit 10 is easy, and thereby the output level of the power reception unit 20 can be finely adjusted.

  As described above, the contactless power transmission device 1 according to the present embodiment has the lock mechanism 35 that fixes the position of the power transmission unit 10 inserted into the frame 30, and the fixing position of the power transmission unit 10 is in the insertion direction. Since the amount of offset of the power transmission unit 10 with respect to the power reception unit 20 changes in accordance with the amount of sliding in the insertion direction of the power transmission unit 10, the output level of the power reception unit 20 changes accordingly. An operator who performs connection work of the power transmission unit 10 under the environment can easily adjust the output level at hand. Therefore, the workability in a fouling environment can be improved, and the convenience of the non-contact power transmission device can be improved.

  In the present embodiment, since the second opening 30B is also provided on the side opposite to the first opening 30A, foreign matters such as dust entering the frame 30 from the first opening 30A. Is easily discharged from the second opening 30 </ b> B, and it is difficult for foreign matter to accumulate in the frame 30. Further, even if a foreign substance enters the frame 30, the inside of the frame 30 can be easily cleaned through the first opening 30A or the second opening 30B. Accordingly, the foreign matter accumulated in the frame 30 interferes with the power transmission unit 10 to cause a positional shift between the power transmission unit 10 and the power reception unit 20, or the foreign matter is sandwiched between the power transmission unit 10 and the power reception unit 20 so When the degree is lowered (the distance between the coils is enlarged), it is possible to prevent the degree of magnetic coupling between the two and the power transmission efficiency from being lowered.

  FIG. 10 is a schematic perspective view showing the structure of the non-contact power transmission apparatus according to the second embodiment of the present invention.

  As shown in FIG. 10, this non-contact power transmission device 2 is characterized in that both of the two openings 30 </ b> A and 30 </ b> B provided on the side surface of the frame 30 constitute an insertion port of the power transmission unit 10. . That is, the frame 30 is provided on the opposite side of the first opening 30A constituting the first insertion port of the power transmission unit 10 and the first opening 30A, and constitutes the second insertion port of the power transmission unit 10 And a second opening 30B. The power transmission unit 10 can be inserted into the frame 30 from the Y1 direction (first direction) in which the first opening 30A is provided, and in the Y2 direction (second direction) in which the second opening 30B is provided. (Direction) can also be inserted into the frame 30. For convenience of explanation, FIG. 10 shows two power transmission units 10, but only one of the power transmission units 10 can be accommodated in the frame 30.

In order to realize insertion from two directions, the frame 30 is provided with two lock mechanisms. That is, the frame 30 includes a first lock mechanism 35A that locks the power transmission unit 10 inserted into the frame 30 from the first opening 30A, and a power transmission unit that is inserted into the frame 30 from the second opening 30B. 10 and a second lock mechanism 35B for locking 10. The first lock mechanism 35A is provided near the first opening 30A of the upper frame 31 of the frame 30, and the second lock mechanism 35B is close to the second opening 30B of the upper frame 31 of the frame 30. Is provided. Both the first and second lock mechanisms 35A, 35B are configured such that a claw portion 37 is formed at the tip of a leaf spring portion 36 formed by cutting out the upper frame 31, and the claw portion 37 is formed by the power transmission unit 10. by engaging the first to third protrusions _13d 1 _{~13d 3} side, the power transmission unit 10 is fixed.

When the insertion from two directions is realized, it is not necessary to provide the positioning projection 13f ₁ or the like on the case body 13a of the power transmission unit 10, and it is necessary to provide the positioning projection 13f ₂ or the like on the case body 13a of the power receiving unit 20. None (see FIG. 4). This is because, if these protrusions are provided, the power transmission unit 10 can be inserted from one direction but cannot be inserted from the opposite direction.

  As described above, the non-contact power transmission device 2 according to the present embodiment has both the two openings 30A and 30B serving as insertion ports for the power transmission unit 10, and thus the non-contact power according to the first embodiment. In addition to the effects of the invention possessed by the transmission device 1, the range of selection of the insertion direction of the power transmission unit 10 can be widened to increase the degree of freedom in layout.

  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. Needless to say, it is included in the range.

  For example, in the above embodiment, the frame 30 is fixed to the power receiving unit 20 and the power transmission unit 10 is detachable. However, the present invention is not limited to such a configuration, and the frame 30 is fixed to the power transmission unit 10. The power receiving unit 20 may be detachable. Furthermore, a pair of power transmission units that perform bidirectional power transmission may be targeted.

  Moreover, in the said embodiment, although the nail | claw part 37 of the locking mechanism 35 engages with the convex part 13d by the side of the power transmission unit 10, you may engage with the recessed part formed in the power transmission unit 10 side. That is, the lock mechanism 35 only needs to be configured to engage with any of a plurality of convex portions or concave portions formed in the power transmission unit 10. Further, the number and pitch of the convex portions or the concave portions are not particularly limited, and can be appropriately set according to the number of steps and the change width of the required output level.

  Moreover, in the said embodiment, since the planar shape of the flame | frame 30 is a rectangle, it has the structure which can be inserted from four directions at the maximum, but if it is a hexagon, for example, it can be inserted from six directions at the maximum. The insertion direction and the number of the power transmission units 10 are not particularly limited.

  Moreover, in the said embodiment, although the non-contact electric power feeding by the electromagnetic induction system using a pair of electric power transmission coil (a power transmission coil and a receiving coil) was mentioned as an example, this invention is not limited to this electromagnetic induction system. Alternatively, a magnetic field resonance method using a pair of power transmission coils or an electric field coupling method using a pair of power transmission electrodes arranged opposite to each other may be employed. In this case, one of the pair of electrodes (first coupling element) is provided on the power transmission unit 10 side, and the other (second coupling element) is provided on the power reception unit 20 side.

1, 2 Contactless power transmission device 10 Power transmission unit (power transmission unit)
11 power-transmission coil 11A power transmission coil 11B receiving coil 12 circuit board 12A power transmission circuit board 12B incoming circuit board 13 case 13a case body 13b cover _{13d, 13d 1, 13d 2,} 13d 3 protrusion _13f 1, 13f ₂ ends of the projections 13g lid Part (guide rail)
13h ₁ recess 13s Stopper 14 Support substrate 15A, 15B Power cable 20 Power receiving unit (power transmission unit)
30 Frame 30A First opening 30B Second opening 30e End face 30g of frame Guide groove 31 Upper frame 32, 33 Side frame 32f, 33f Flange 34 Bottom frame 35 Lock mechanism 35A First lock mechanism 35B Second Lock mechanism 36 Leaf spring part 37 Claw part 38 Projection part C _A Coil axis C of power transmission coil C _B Coil axis of power reception coil

Claims (8)

First and second power transmission units that transmit power from at least one to the other in a contactless manner;
The second power transmission unit is fixedly accommodated, the first power transmission unit is detachably accommodated, and the first power transmission unit is aligned and fixed with respect to the second power transmission unit. With a frame to perform,
The frame has a lock mechanism for fixing the position of the first power transmission unit inserted in the frame;
The fixed position of the first power transmission unit is configured in multiple stages with respect to the insertion direction, and the output level of the power transmission unit on the power receiving side is the amount of sliding in the insertion direction of the first power transmission unit. A non-contact power transmission device that changes according to the frequency. The first power transmission unit has a plurality of convex portions or concave portions,
The contactless power transmission device according to claim 1, wherein the lock mechanism is engaged with any of the plurality of convex portions or concave portions.   The non-contact power transmission device according to claim 2, wherein a cross-sectional shape of the convex portion or the concave portion is a saw shape.   The non-contact power transmission device according to claim 2, wherein a cross-sectional shape of the convex portion or the concave portion is a wave shape. The frame is
An upper frame facing the first power transmission unit housed in the frame;
A side frame that supports the upper frame and guides the insertion of the first power transmission unit into the frame;
The locking mechanism has a leaf spring portion formed on the upper frame, and a claw portion formed at a tip portion of the leaf spring portion,
The non-contact according to any one of claims 2 to 4, wherein the claw portion engages with any of the plurality of convex portions or concave portions of the first power transmission unit housed in the frame. Power transmission device.   The said frame has a 1st opening part which comprises the insertion port of a said 1st electric power transmission unit, and a 2nd opening part located in the other side of the said 1st opening part. The non-contact power transmission device according to any one of the above.   The non-contact power transmission device according to claim 6, wherein the second opening constitutes an insertion port of the first power transmission unit together with the first opening. The first power transmission unit includes a power transmission coil that transmits power, a power transmission circuit board on which a power transmission circuit that drives the power transmission coil is mounted, and a first case that houses the power transmission coil and the power transmission circuit board. A power transmission unit including
The second power transmission unit includes a power receiving circuit that includes a power receiving coil that receives power transmitted from the power transmitting coil, and a rectifying and smoothing circuit that converts AC power from the power receiving coil into DC power. The non-contact power transmission device according to claim 1, wherein the non-contact power transmission device is a power reception unit including a substrate and a second case that accommodates the power reception coil and the power reception circuit substrate.

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