JP2013118738A - Non-contact electric power transmission apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact electric power transmission apparatus capable of increasing a transmission distance.SOLUTION: The non-contact electric power transmission apparatus 10 includes: a washstand 20 with a primary coil 30; an electric toothbrush 60 with a secondary coil 63 and an auxiliary coil 64; and relay coils 31-33 that relay a flow of magnetic flux from the primary coil 30 to the auxiliary coil 64. The auxiliary coil 64 is not electrically connected with a rectification circuit 73. The respective relay coils 31-33 are positioned between the primary circuit 40 and the secondary circuit 70.

Description

  The present invention includes a power transmission device having a primary coil, a power reception device having a secondary coil and a power feeding circuit, and contactless power provided that a current generated in the secondary coil is supplied to the power feeding circuit. The present invention relates to a transmission apparatus.

  The non-contact power transmission device of Patent Document 1 transmits power to the secondary coil by interlinking the magnetic flux of the primary coil with the secondary coil. The secondary battery is charged by supplying the current of the secondary coil to the power feeding circuit.

Japanese Patent No. 3416863

  In a non-contact power transmission device, it is desired to increase the transmission distance. Note that the non-contact power transmission device of Patent Document 1 does not particularly take into account increasing the transmission distance.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a non-contact power transmission apparatus that can increase the transmission distance.

  The contactless power transmission device of the present invention includes a power transmission device having a primary coil, a power reception device having a secondary coil and a power feeding circuit, and supplies current generated in the secondary coil to the power feeding circuit. The power receiving device includes an auxiliary coil that is not electrically connected to the power feeding circuit, and a relay coil that relays the flow of magnetic flux from the primary coil to the auxiliary coil. It is characterized by being provided between a device and the power receiving device.

  -In this non-contact-type electric power transmission apparatus, it is preferable that the power transmission apparatus includes a plurality of primary coils, and that the magnetic fluxes of the plurality of primary coils interlink with the relay coils.

  In this non-contact power transmission device, one of the primary coils is a primary coil CA, and another is a primary coil CB, and the primary coil CA and the primary coil It is preferable that the positional relationship with CB can be changed.

-In this non-contact-type electric power transmission apparatus, it is preferable to provide the said some relay coil.
In this non-contact power transmission device, the relay coil is configured as a separate member from the power transmission device, and the winding diameter of the relay coil is smaller than the winding diameter of the primary coil It is preferable.

  -In this non-contact-type electric power transmission apparatus, it is preferable that the said relay coil is not connected to the electrical load.

  The present invention provides a contactless power transmission device capable of increasing a transmission distance.

The perspective view which shows the one part perspective structure of the washstand which comprises the same apparatus about the non-contact-type electric power transmission apparatus of 1st Embodiment of this invention. Sectional drawing which shows the partial cross-section of a part of wash-stand and an electric toothbrush about the non-contact-type electric power transmission apparatus of the embodiment. The circuit diagram which shows the circuit structure about the non-contact-type electric power transmission apparatus of the embodiment. Sectional drawing which shows the cross-section of a part of wash-stands which comprises the apparatus, and a part of electric toothbrush about the non-contact-type electric power transmission apparatus of 2nd Embodiment of this invention. The graph which shows the relationship between load resistance and transmission efficiency about the non-contact-type electric power transmission apparatus of the embodiment. The graph which shows the relationship between the center distance and transmission efficiency about the non-contact-type electric power transmission apparatus of the embodiment. The perspective view which shows the one part perspective structure of the washstand which comprises the same apparatus about the non-contact-type electric power transmission apparatus of 3rd Embodiment of this invention. The schematic diagram which shows the positional relationship of a primary coil, a relay coil, an auxiliary | assistant coil, and a secondary coil about the non-contact-type electric power transmission apparatus of the embodiment. The front view which shows the front structure of the makeup | decoration porch which comprises the same apparatus about the non-contact-type electric power transmission apparatus of 4th Embodiment of this invention. Sectional drawing which shows typically the cross-section of a part of electric toothbrush and its periphery about the non-contact-type electric power transmission apparatus of the embodiment. About the non-contact-type electric power transmission apparatus of 5th Embodiment of this invention, (a) is a perspective view which shows the perspective structure of the state in which the door of the washstand which comprises the apparatus was closed, (b) is the door of the washstand. The perspective view which shows the perspective structure of the state which opened. Regarding the non-contact power transmission device according to another embodiment of the present invention, (a) is a schematic diagram schematically showing a circular auxiliary coil and a quadratic secondary coil, and (b) is a square auxiliary coil and a square 2 The schematic diagram which shows a secondary coil typically, (c) is a schematic diagram which shows typically a square auxiliary coil and a circular secondary coil. About the non-contact-type electric power transmission apparatus of other embodiment of this invention, (a) is sectional drawing which shows the cross-sectional structure of a primary coil, an auxiliary | assistant coil, a secondary coil, and a pot core, (b) is the planar structure of a pot core. FIG. The perspective view which shows the perspective structure of an EER core about the non-contact-type electric power transmission apparatus of other embodiment of this invention. Regarding the contactless power transmission device of another embodiment of the present invention, (a) is a sectional view showing a sectional structure of a primary coil, an auxiliary coil, a secondary coil, and an EE core, and (b) is a perspective view of the EE core. The perspective view which shows a structure. Sectional drawing which shows the cross-section of a primary coil, an auxiliary | assistant coil, a secondary coil, and a magnetic sheet about the non-contact-type electric power transmission apparatus of other embodiment of this invention. Sectional drawing which shows the cross-section of an auxiliary coil, a secondary coil, and a core about the non-contact-type electric power transmission apparatus of other embodiment of this invention. About the non-contact-type electric power transmission apparatus of other embodiment of this invention, (a) is a top view which shows the planar structure of a primary coil and a magnetic sheet, (b) is sectional structure of the AA line of the (a) FIG. The schematic diagram which shows the positional relationship of a primary coil, a relay coil, an auxiliary | assistant coil, and a secondary coil about the non-contact-type electric power transmission apparatus of other embodiment of this invention.

(First embodiment)
With reference to FIG. 1, the structure of the non-contact-type electric power transmission apparatus 10 is demonstrated. In FIG. 1, the number of turns of the primary coil 30 and each relay coil 31 to 33 is less than the actual number of turns, and the shapes of the primary coil 30 and each relay coil 31 to 33 are simplified. In addition, in the drawings in which the coils in the drawings after FIG. 2 are described, the number of turns is reduced as in FIG. 1 and the coils are displayed.

  The non-contact power transmission device 10 includes a wash basin 20 having a primary coil 30 and an electric toothbrush 60 having a secondary coil 63. The primary coil 30 of the wash basin 20 transmits electric power to the secondary battery 66 of the electric toothbrush 60 by an electromagnetic induction method. The wash basin 20 corresponds to a “power transmission device”. The electric toothbrush 60 corresponds to a “power receiving device”.

  The wash basin 20 includes a mirror 21 and a lighting fixture 26 that constitute the upper part of the wash basin 20, and a wash counter 22 that constitutes the lower part of the wash basin 20. The mirror 21 has a left mirror 21A and a right mirror 21B. The wash counter 22 includes a sink 23, a mounting table 24 on which the electric toothbrush 60 and the like can be mounted, and a support table 25 that supports the mirror 21. The luminaire 26 is located above the mirror 21.

  The left mirror 21A has a primary coil 30 and a magnetic sheet 34 inside. The right mirror 21B has a first relay coil 31 inside. The sink 23 has a second relay coil 32 inside. The mounting table 24 has a third relay coil 33 inside.

  The primary coil 30 is formed as a planar coil having a quadrangle in plan view. The first relay coil 31 is formed as a planar coil having a square shape in plan view. The second relay coil 32 is formed across the sink 23 and the support base 25 as a coil having a shape along the surfaces of the sink 23 and the support base 25. The third relay coil 33 is formed over the mounting table 24 and the support table 25 as a coil having a shape along the surfaces of the mounting table 24 and the support table 25.

  The conductive wires of the primary coil 30, the first relay coil 31, the second relay coil 32, and the third relay coil 33 have the same outer diameter. The length of each side of the magnetic sheet 34 is larger than the length of each side of the primary coil 30. Each relay coil 31-33 has the same number of turns. The number of turns of each relay coil 31 to 33 is larger than the number of turns of the primary coil 30.

  The second relay coil 32 is bent at the connection portion between the sink 23 and the support base 25. For this reason, the direction of the magnetic flux generated in the portion corresponding to the sink 23 in the second relay coil 32 and the direction of the magnetic flux generated in the portion corresponding to the support base 25 in the second relay coil 32 are different from each other.

  The third relay coil 33 is bent at the connection portion between the mounting table 24 and the support table 25. For this reason, the direction of the magnetic flux generated in the portion corresponding to the mounting table 24 in the third relay coil 33 and the direction of the magnetic flux generated in the portion corresponding to the support base 25 in the third relay coil 33 are different from each other.

  The configuration of the electric toothbrush 60 will be described with reference to FIG. In addition, the arrow X in the figure indicates the axial direction X of the electric toothbrush 60. An arrow Y in the figure indicates the width direction Y of the electric toothbrush 60. The width direction Y corresponds to a direction orthogonal to the axial direction X.

  The electric toothbrush 60 includes a main body case 61 held by a user, and an attachment 62 that can be attached to and detached from the main body case 61. The attachment 62 has a brush portion 62A in which a bristle bundle is implanted. The brush portion 62 </ b> A is located at the distal end portion of the attachment 62.

  The main body case 61 includes an auxiliary coil 64 interlinking with the magnetic flux of the primary coil 30, a secondary coil 63 interlinking with the magnetic flux of the auxiliary coil 64, a cylindrical core 65 formed of a magnetic material, and an electric toothbrush. A secondary battery 66 serving as a power source 60 and an electric motor 67 that vibrates the attachment 62 are included. The auxiliary coil 64, the secondary coil 63, the core 65, the secondary battery 66, and the electric motor 67 are located inside the main body case 61.

  The secondary coil 63 is formed as a cylindrical coil having a circular shape in plan view. That is, the plurality of circular portions constituting the secondary coil 63 have a structure in which the electric toothbrush 60 is stacked on each other in the axial direction X. One end of the secondary coil 63 is in contact with one end of the auxiliary coil 64.

  The auxiliary coil 64 is formed as a cylindrical coil having a circular shape in plan view. That is, the plurality of circular portions constituting the auxiliary coil 64 have a structure in which they are stacked on each other in the axial direction X of the electric toothbrush 60.

  The secondary coil 63 and the auxiliary coil 64 have a cylindrical core 65. The core 65 is located in the hollow part of the secondary coil 63 and the auxiliary coil 64. That is, the secondary coil 63 and the auxiliary coil 64 are configured as a cored coil having one common core 65. Further, the secondary coil 63 and the auxiliary coil 64 have the same axis.

With reference to FIG. 1 and FIG. 2, the relationship between each coil 30,63,64 is demonstrated.
(A) The diameter of the conductive wire of the primary coil 30 is larger than the diameter of the conductive wire of the secondary coil 63.
(B) The diameter of the conductive wire of the primary coil 30 is larger than the diameter of the conductive wire of the auxiliary coil 64.
(C) The number of turns of the primary coil 30 is larger than the number of turns of the secondary coil 63.
(D) The number of turns of the primary coil 30 is equal to the number of turns of the auxiliary coil 64.

  The Q value of the auxiliary coil 64 is larger than the Q value of the secondary coil 63 because each of the coils 30, 63, 64 has the relationships (A) to (D). The coupling coefficient between the secondary coil 63 and the auxiliary coil 64 (hereinafter referred to as “power receiving coupling coefficient”) is such that the secondary coil 63 and the auxiliary coil 64 are coaxial because the secondary coil 63 and the auxiliary coil 64 are coaxial. It is larger than the power receiving coupling coefficient of the configuration not having.

With reference to FIG. 3, the circuit configuration of the non-contact power transmission apparatus 10 will be described.
The wash basin 20 includes a primary circuit 40 that controls power supplied to the primary coil 30 and a relay circuit 50 that relays the magnetic flux of the primary coil 30 to the auxiliary coil 64. The electric toothbrush 60 includes a secondary circuit 70 that controls electric power transmitted from the primary circuit 40.

  The primary circuit 40 includes a transmission circuit 41 that supplies alternating power to the primary coil 30, a power transmission control unit 42 that controls the transmission circuit 41, a primary coil 30 connected to the transmission circuit 41, and the primary coil 30. And a capacitor 43 connected in series. In addition, a primary antenna 45 that transmits and receives signals to and from the secondary circuit 70 is provided. The transmission circuit 41 has a plurality of transistors connected to the primary coil 30. The primary coil 30 and the capacitor 43 constitute a resonance circuit 44.

  The power transmission control unit 42 repeatedly transmits a voltage signal for requesting a response to a transmission destination device such as the electric toothbrush 60 (hereinafter, “response request signal”) via the primary antenna 45 at predetermined intervals. The response request signal is generated by alternating power supplied to the primary coil 30.

  The relay circuit 50 includes a first relay circuit 51 having a first relay coil 31 and a capacitor 54, a second relay circuit 52 having a second relay coil 32 and a capacitor 55, and a third relay coil 33 having a capacitor 56. 3 relay circuit 53.

  In the first relay circuit 51, a capacitor 54 connected in series to the first relay coil 31 and the first relay coil 31 constitute a resonance circuit. In the second relay circuit 52, a capacitor 55 connected in series to the second relay coil 32 and the second relay coil 32 constitute a resonance circuit. In the third relay circuit 53, a capacitor 56 connected in series to the third relay coil 33 and the third relay coil 33 constitute a resonance circuit. The capacities of the capacitors 54 to 56 are set so that the resonance frequencies of the relay circuits 51 to 53 coincide with the reference frequency FK.

  The first relay circuit 51, the second relay circuit 52, and the third relay circuit 53 are electrically disconnected from each other and electrically disconnected from the primary circuit 40 and the secondary circuit 70. Have. For this reason, the impedance of each relay coil 31-33 becomes small compared with the structure which does not have at least one of each said relationship.

  The secondary circuit 70 is connected in series to the auxiliary coil 64 that forms a magnetic circuit with the primary coil 30, the secondary coil 63 that forms a magnetic circuit with the auxiliary coil 64, and the auxiliary coil 64. And a capacitor 72. In addition, between the primary circuit 40, a rectifier circuit 73 that rectifies alternating power generated in the secondary coil 63 into DC power, a power supply control unit 74 that controls DC power supplied to the secondary battery 66, and the like. And a secondary antenna 75 for transmitting and receiving signals. The rectifier circuit 73 and the power supply control unit 74 correspond to a “power supply circuit”.

  The rectifier circuit 73 includes a rectifier bridge formed by combining four diodes, and a capacitor that smoothes the current that has passed through the rectifier bridge. The rectifier circuit 73, the secondary coil 63, and the power supply control unit 74 are electrically connected to each other.

  In the power receiving circuit 71, a capacitor 72 connected in series to the auxiliary coil 64 and the auxiliary coil 64 constitute a resonance circuit. The capacitance of the capacitor 72 is set so that the resonance frequency of the power receiving circuit 71 matches the reference frequency FK.

  The power receiving circuit 71, the rectifier circuit 73, and the power feeding control unit 74 are electrically disconnected from each other. For this reason, compared with the structure which does not have the same relationship, the impedance of the auxiliary coil 64 becomes small.

  The power supply control unit 74 includes a DC-DC converter (not shown) that controls the voltage of the DC power rectified by the rectifier circuit 73, and a transistor (not shown) that switches between supply and interruption of the DC power to the secondary battery 66. Have The power supply control unit 74 and the secondary battery 66 are electrically connected to each other.

  The power supply control unit 74 changes the voltage of the DC power by the DC-DC converter according to the charging state of the secondary battery 66, and changes the amount of power supplied to the secondary battery 66 to the charging state of the secondary battery 66. The power supply control is changed according to the operation.

  In the power supply control, when charging of the secondary battery 66 is not completed, the transistor is kept in an on state, that is, a state where DC power is supplied to the secondary battery 66. On the other hand, when the secondary battery 66 is fully charged, the transistor is kept off.

  When the power supply control unit 74 receives the response request signal of the power transmission control unit 42 via the secondary antenna 75, the power supply control unit 74 transmits a voltage signal (hereinafter, “response confirmation signal”) indicating that the response request signal has been received. 42. When receiving the response confirmation signal, the power transmission control unit 42 determines that the electric toothbrush 60 is mounted on the mounting table 24 of the washstand 20. Then, charging of the secondary battery 66 by the primary circuit 40 is started.

With reference to FIG. 3, the power transmission mode of the non-contact power transmission apparatus 10 will be described. In addition, since the transmission aspect of the response request signal from the primary coil 30 to the secondary coil 63 becomes the same as the following electric power transmission aspect, the description is abbreviate | omitted.
(A) The power transmission control unit 42 of the wash basin 20 supplies alternating power having the reference frequency FK to the primary coil 30 by controlling the transmission circuit 41.
(B) The primary coil 30 generates alternating magnetic flux when supplied with alternating power.
(C) The first relay coil 31 and the second relay coil 32 are linked with the alternating magnetic flux of the primary coil 30 to generate alternating power and alternating magnetic flux of the reference frequency FK.
(D) The third relay coil 33 generates alternating power and alternating magnetic flux of the reference frequency FK by interlinking with the alternating magnetic flux of the first relay coil 31 and the second relay coil 32. The alternating magnetic flux of the third relay coil 33 hardly interlinks with the secondary coil 63 because the Q value of the auxiliary coil 64 is higher than the Q value of the secondary coil 63.
(E) The auxiliary coil 64 is linked with the alternating magnetic flux of the third relay coil 33 to generate an alternating power and an alternating magnetic flux of the reference frequency FK. The alternating power and the alternating magnetic flux generated in the auxiliary coil 64 are larger than the alternating power and the alternating magnetic flux generated in the auxiliary coil 64 in the configuration in which the rectifier circuit 73 and the power receiving circuit 71 are electrically connected.
(F) The secondary coil 63 generates alternating power by interlinking with the alternating magnetic flux of the auxiliary coil 64.
(G) The rectifier circuit 73 smoothes the alternating power of the secondary coil 63 and converts it into DC power.
(H) The power supply controller 74 supplies the DC power of the rectifier circuit 73 to the secondary battery 66.

(Effect of embodiment)
The non-contact power transmission device 10 of the present invention has the following effects.
(1) The wash basin 20 of the non-contact power transmission apparatus 10 includes the relay coils 31 to 33. According to this structure, since each relay coil 31-33 relays the flow of the magnetic flux from the primary coil 30 to the auxiliary coil 64, the magnetic flux of the primary coil 30 is directly linked to the auxiliary coil 64, and In comparison, the transmission distance can be increased.

  (2) The washstand 20 of the non-contact power transmission apparatus 10 includes a plurality of relay coils, that is, a first relay coil 31, a second relay coil 32, and a third relay coil 33. According to this configuration, the transmission distance is increased as compared with the configuration having one or two relay coils. Further, the range in which the flow of magnetic flux from the primary coil 30 to the auxiliary coil 64 is relayed is larger than that of the same configuration. For this reason, even when the electric toothbrush 60 is disposed at a position other than the mounting table 24, for example, at the outer peripheral portion of the sink 23, power is transmitted from the washstand 20 to the electric toothbrush 60.

  (3) The relay coils 31 to 33 of the non-contact power transmission device 10 are not connected to an electric load. According to this structure, compared with the structure where each relay coil 31-33 is connected to an electric load, the electric current which arises in each relay coil 31-33 becomes large when the magnetic flux of the primary coil 30 is linked. For this reason, a transmission distance becomes larger than the structure of the said comparison object.

  (4) The auxiliary coil 64 of the non-contact power transmission device 10 is not electrically connected to the rectifier circuit 73. According to this configuration, compared to the configuration in which the auxiliary coil 64 is electrically connected to the rectifier circuit 73, the current and magnetic flux of the auxiliary coil 64 that are generated when the magnetic flux of the primary coil 30 is linked are increased. That is, as compared with a configuration in which the magnetic flux of the primary coil 30 is directly linked to the secondary coil 63, the magnetic flux of the primary coil 30 is generated in the coil (auxiliary coil 64) first linked in the electric toothbrush 60. Current and magnetic flux increase. Thereby, since the current of the secondary coil 63 generated when the magnetic flux of the auxiliary coil 64 is linked increases, the transmission distance becomes larger than that of the configuration to be compared.

  (5) The auxiliary coil 64 and the secondary coil 63 of the non-contact power transmission device 10 have a coaxial axis. According to this configuration, the power receiving coupling coefficient is increased as compared with a configuration in which the auxiliary coil 64 and the secondary coil 63 do not have a coaxial axis. For this reason, the current of the secondary coil 63 generated via the auxiliary coil 64 is larger than that of the same configuration.

  (6) The auxiliary coil 64 and the secondary coil 63 of the non-contact power transmission device 10 have a circular shape in plan view. According to this configuration, the cost of the auxiliary coil 64 and the secondary coil 63 is reduced as compared with a configuration using a coil having a shape other than a circle, for example, a triangle or a quadrangle, in plan view.

  (7) The auxiliary coil 64 of the non-contact power transmission device 10 has a core 65. According to this configuration, compared to a configuration in which the core 65 is omitted from the auxiliary coil 64, the amount of magnetic flux leakage between the primary coil 30 and the auxiliary coil 64 is reduced.

  (8) The secondary coil 63 of the non-contact power transmission device 10 has a core 65. According to this configuration, the amount of magnetic flux leakage between the auxiliary coil 64 and the secondary coil 63 is reduced as compared with the configuration in which the core 65 is omitted from the secondary coil 63.

  (9) The auxiliary coil 64 and the secondary coil 63 of the non-contact power transmission device 10 have a common core 65. According to this configuration, the number of cores can be reduced as compared with the configuration in which the auxiliary coil 64 and the secondary coil 63 are individually provided with a core.

  (10) The auxiliary coil 64 and the secondary coil 63 of the non-contact power transmission apparatus 10 have a core 65 in the hollow portion. According to this configuration, the physique of the electric toothbrush 60 can be made smaller than the configuration using a core that covers the auxiliary coil 64 and the secondary coil 63 from the outside in the width direction Y.

(Second Embodiment)
The contactless power transmission device 10 of the present embodiment shown in FIG. 4 has the following differences as main differences from the contactless power transmission device 10 of the first embodiment shown in FIG. That is, the auxiliary coil 64 and the secondary coil 63 of the electric toothbrush 60 of the first embodiment are coaxial. On the other hand, the auxiliary coil 64 and the secondary coil 63 of the electric toothbrush 60 of the present embodiment have axes that are parallel to each other. In the following, details of differences from the contactless power transmission device 10 of the first embodiment will be described, and the same reference numerals will be given to components common to the first embodiment, and a part or all of the description will be omitted. To do.

  The electric toothbrush 60 has a core 80 made of a magnetic material instead of the core 65 of FIG. The core 80 includes a columnar first core 81 inserted into the hollow portion of the auxiliary coil 64 and a columnar second core 82 inserted into the hollow portion of the secondary coil 63.

  The second core 82 protrudes from the end surface of the first core 81 in the axial direction X of the electric toothbrush 60. The central axis of the second core 82 is eccentric with respect to the central axis of the first core 81. For this reason, the central axis of the secondary coil 63 is eccentric with respect to the central axis of the auxiliary coil 64.

The relationship between the coils 30, 63 and 64 is shown below. The inter-coil distance G <b> 1 indicates the distance between the end of the auxiliary coil 64 and the end of the secondary coil 63 in the axial direction X of the electric toothbrush 60. The inter-coil distance G <b> 2 indicates the distance between the end of the auxiliary coil 64 and the end of the primary coil 30 in the axial direction X of the electric toothbrush 60.
(A) The axis JA of the secondary coil 63 and the axis JB of the auxiliary coil 64 are parallel to each other.
(B) One end of the auxiliary coil 64 is not in contact with one end of the secondary coil 63.
(C) The inter-coil distance G1 is smaller than the inter-coil distance G2.

  The relationship (A) described above is such that the power receiving coupling coefficient is reduced as compared with the configuration in which the secondary coil 63 and the auxiliary coil 64 are coaxial. The relationship (B) described above is such that the power receiving coupling coefficient is made smaller than in the configuration in which one end of the secondary coil 63 is in contact with one end of the auxiliary coil 64.

The power receiving coupling coefficient is the distance between the axis JA of the secondary coil 63 and the axis JB of the auxiliary coil 64 in the radial direction of the secondary coil 63 and the auxiliary coil 64 (hereinafter, “radial distance R”), and the inter-coil distance G1. Correlation with each of the above. The specific relationship is shown below.
(A) The power receiving coupling coefficient decreases as the radial distance R increases.
(B) The power receiving coupling coefficient decreases as the inter-coil distance G1 increases.

  Therefore, by changing at least one of the radial distance R and the inter-coil distance G1 in the design stage of the electric toothbrush 60, the magnitude of the power receiving coupling coefficient can be adjusted according to various design conditions.

  The relationship between the load resistance of the secondary coil 63 and the transmission efficiency will be described with reference to FIG. 5 indicates the transmission efficiency, that is, the ratio of the current supplied to the primary coil 30 and the current generated in the secondary coil 63 due to the same current. The horizontal axis in FIG. 5 indicates the magnitude of the load resistance.

  Examples of the load resistance include the rectifier circuit 73, the secondary battery 66, and the electric motor 67 of FIG. Assuming that the voltage of the primary coil 30 is constant, the current supplied to the rectifier circuit 73, the secondary battery 66, and the electric motor 67 decreases as the load resistance increases.

Here, as a configuration defined by the relationship between the secondary coil 63 and the auxiliary coil 64, a “coaxial configuration”, a “first parallel axis configuration”, and a “second parallel axis configuration” are respectively defined as follows.
(A) The coaxial configuration indicates a configuration in which the secondary coil 63 and the auxiliary coil 64 are coaxial, and the secondary coil 63 is in contact with the auxiliary coil 64. The power reception coupling coefficient of the coaxial configuration is larger than the power reception coupling coefficient of the first parallel shaft configuration.
(B) The first parallel axis configuration indicates a configuration in which the axis JA of the secondary coil 63 and the axis JB of the auxiliary coil 64 are parallel to each other and the secondary coil 63 is not in contact with the auxiliary coil 64.
(C) The second parallel axis configuration is such that the axis JA of the secondary coil 63 and the axis JB of the auxiliary coil 64 are parallel to each other, the secondary coil 63 does not contact the auxiliary coil 64, and the first parallel axis configuration. A configuration with a smaller power receiving coupling coefficient is shown.

Each curve L1-L3 of FIG. 5 shows the following relationships, respectively.
(A) A curve L1 shows the relationship between the load resistance of the coaxial configuration and the transmission efficiency.
(B) Curve L2 shows the relationship between the load resistance and transmission efficiency of the first parallel shaft configuration.
(C) Curve L3 shows the relationship between the load resistance and the transmission efficiency of the second parallel axis configuration.

The relationship between the load resistance and transmission efficiency confirmed from the curves L1 to L3 is shown below. Hereinafter, the maximum transmission efficiency in an arbitrary curve is referred to as “maximum transmission efficiency”, and the load resistance corresponding to the maximum transmission efficiency is referred to as “maximum load resistance”.
(A) The maximum load resistance of the curve L2 is smaller than the maximum load resistance of the curve L1.
(B) The maximum load resistance of the curve L3 is smaller than the maximum load resistance of the curve L2.

  In the electric toothbrush 60, the relationship between the curves L1 to L3 is grasped in advance by a test or the like, so that the transmission coupling suitable for the magnitude of the load resistance connected to the secondary coil 63 is obtained. A coefficient can be set. For example, when the load resistance is constant, a configuration in which the transmission efficiency among the curves L1 to L3 is maximized with respect to the load resistance can be selected. In addition, as a case where load resistance is a fixed magnitude | size, the case where the charge of the secondary battery 66 is performed with a fixed electric current is mentioned.

  With reference to FIG. 6, the relationship between the inter-axis distance and the transmission efficiency will be described. The vertical axis in FIG. 6 indicates transmission efficiency. The horizontal axis in FIG. 6 indicates the inter-axis distance, that is, the distance between the axis JC of the primary coil 30 and the axis JB of the auxiliary coil 64 in the width direction Y of the electric toothbrush 60 in FIG. In addition, the non-contact power transmission device 10 of FIG. 4 shows a state in which the distance between the axes is “0”.

Each curve K1-K3 of FIG. 6 shows the following relationships, respectively.
(A) Curve K1 shows the relationship between the axial distance of a coaxial structure, and transmission efficiency.
(B) A curve K2 shows the relationship between the inter-axis distance and the transmission efficiency of the first parallel shaft configuration.
(C) Curve K3 shows the relationship between the inter-axis distance and the transmission efficiency of the second parallel axis configuration.

  FIG. 6A shows a relationship between the inter-axis distance and the transmission efficiency in the configuration in which the inter-coil distance G2 is small. FIG. 6B shows the relationship between the inter-axis distance and the transmission efficiency in the configuration in which the inter-coil distance G2 is larger than that in FIG. FIG. 6C shows the relationship between the inter-axis distance and the transmission efficiency in the configuration in which the inter-coil distance G2 is larger than that in FIG. 6B.

  The relationship between the interaxial distances and the transmission efficiencies (curves K1 to K3) of the coaxial configuration, the first parallel axis configuration, and the second parallel axis configuration show almost the same tendency at the same inter-coil distance G2.

  In the electric toothbrush 60, the relationship between the curves K1 to K3 is grasped in advance by a test or the like, so that the power receiving coupling coefficient can be set so that transmission efficiency suitable for the inter-coil distance G2 can be obtained. For example, when the inter-coil distance G2 is a constant size, a configuration in which the transmission efficiency among the curves K1 to K3 is the maximum with respect to the size of the inter-coil distance G2 can be selected.

(Effect of embodiment)
In addition to the effects (1) to (4) and (6) to (10) exhibited by the contactless power transmission apparatus 10 of the first embodiment, the contactless power transmission apparatus 10 of the present embodiment has the following effects. Play.

  (11) The non-contact power transmission apparatus 10 includes a secondary coil 63 and an auxiliary coil 64 that are individually formed. According to this configuration, the distance in the width direction Y between the axis JA of the secondary coil 63 and the axis JB of the auxiliary coil 64 in the width direction Y of the electric toothbrush 60 is adjusted in the design stage of the non-contact power transmission device 10. be able to. Further, the distance between the secondary coil 63 and the auxiliary coil 64 in the axial direction X of the electric toothbrush 60 can be adjusted. For this reason, the power receiving coupling coefficient suitable for the magnitude of the load resistance or the distance between the axes can be selected.

(Third embodiment)
The contactless power transmission device 10 of the present embodiment shown in FIGS. 7 and 8 is different from the contactless power transmission device 10 of the first embodiment shown in FIG. 1 as the following differences. Have That is, the wash basin 20 according to the first embodiment includes the primary coil 30 in the left mirror 21A, and the relay coils 31 to 33 in the right mirror 21B, the sink 23, and the mounting table 24. Moreover, the electric toothbrush 60 is provided as a power receiving apparatus. On the other hand, the washstand 20 of the present embodiment has a primary coil 30 on the mounting table 24. Further, as the power receiving device, an electric razor 90 is provided instead of the electric toothbrush 60 of the first embodiment. Below, the detail of a different point from the non-contact-type electric power transmission apparatus 10 of 1st Embodiment is demonstrated, about the structure which is common in the same embodiment, the same code | symbol is attached | subjected and the one part or all part of the description is abbreviate | omitted. .

  As shown in FIG. 7, the non-contact power transmission device 10 includes an electric razor 90 and its washing machine 91. The wash counter 22 includes a sink 23, a mounting table 24 on which the cleaning machine 91 and the like can be mounted, and a support table 25 that supports the mirror 21.

  The washstand 20 omits the relay coils 31 to 33 (relay circuits 51 to 53) from the washstand 20 of the first embodiment. Further, the primary coil 30 and the magnetic sheet 34 are omitted from the left mirror 21A. The mounting table 24 includes a primary coil 30 and a magnetic sheet 34. The mounting table 24 of the wash basin 20 corresponds to a “power transmission device”.

  As shown in FIG. 8, the washing machine 91 has a relay coil 92 inside. The relay coil 92 is formed as a planar coil having a circular shape in plan view. The outer diameter of the relay coil 92 is smaller than the dimension of each side of the primary coil 30. The relay coil 92 is connected in series with a capacitor (not shown). The relay coil 92 and the capacitor constitute a resonance circuit. The capacitance of the capacitor is set so that the resonance frequency of the resonance circuit matches the reference frequency FK. The outer diameter of the relay coil 92 corresponds to “the winding diameter of the relay coil”. The dimension of each side of the primary coil 30 corresponds to “the winding diameter of the primary coil”.

  Similar to the electric toothbrush 60 of the first embodiment, the electric razor 90 includes an auxiliary coil 64, a secondary coil 63, a core 65, a secondary circuit 70, and a secondary battery 66. The auxiliary coil 64, the secondary coil 63, the core 65, the secondary circuit 70, and the secondary battery 66 are located inside the electric razor 90.

With reference to FIG. 3 and FIG. 8, the power transmission mode of the non-contact power transmission device 10 will be described. In addition, since the supply mode of the electric power from the secondary coil 63 of the electric shaver 90 to the secondary battery 66 is the same as that of 1st Embodiment, the description is abbreviate | omitted.
(A) The power transmission control unit 42 of the wash basin 20 supplies alternating power having the reference frequency FK to the primary coil 30 by controlling the transmission circuit 41.
(B) The primary coil 30 generates alternating magnetic flux when supplied with alternating power.
(C) The relay coil 92 of the electric razor 90 generates alternating power and alternating magnetic flux of the reference frequency FK by interlinking with the alternating magnetic flux of the primary coil 30.
(D) The auxiliary coil 64 of the electric razor 90 generates alternating power and alternating magnetic flux of the reference frequency FK by interlinking with the alternating magnetic flux of the relay coil 92.

(Effect of embodiment)
The contactless power transmission device 10 of the present embodiment has the following effects in addition to the effects (1) to (10) exhibited by the contactless power transmission device 10 of the first embodiment.

  (12) The outer diameter of the relay coil 92 of the non-contact power transmission device 10 is smaller than the dimension of each side of the primary coil 30. The relay coil 92 has a circular shape. The primary coil 30 has a quadrangular shape. According to this configuration, the primary coil 30 and the secondary coil 63 are arranged so that the outer peripheral edge of the relay coil 92 does not fall outside the same range within the range surrounded by the outer peripheral edge of the primary coil 30. The power transmission between them is performed efficiently. Therefore, the relay coil 92 is positioned with respect to the primary coil 30, that is, the cleaning machine 91 is positioned with respect to the primary coil 30, compared to the configuration in which the outer diameter of the relay coil 92 is the same as the dimensions of each side of the primary coil 30. Can be easily.

(Fourth embodiment)
The contactless power transmission device 10 of the present embodiment shown in FIG. 9 and FIG. 10 is different from the contactless power transmission device 10 of the third embodiment shown in FIG. 7 as the following differences. Have That is, the non-contact power transmission device 10 of the third embodiment includes an electric razor 90 and a washing machine 91. On the other hand, the power receiving device of this embodiment includes an electric toothbrush 60 and a cosmetic pouch 100. Hereinafter, details of differences from the non-contact power transmission apparatus 10 of the third embodiment will be described, and the same reference numerals will be given to components common to the embodiment, and a part or all of the description will be omitted.

With reference to FIG. 9, the structure of the cosmetic pouch 100 is demonstrated.
The cosmetic pouch 100 includes a case 101 constituting the main body, a relay coil 102 that links the magnetic flux of the primary coil 30, and a capacitor (not shown) connected in series with the relay coil 102. The case 101 has a relay coil 102 on the outer peripheral portion of the front view.

  The relay coil 102 is formed as a planar coil having a quadrangle in a front view of the case 101. The dimension of each side of the relay coil 102 is smaller than the dimension of each side of the primary coil 30 in FIG. The dimension of each side of the relay coil 102 corresponds to “the winding diameter of the relay coil”.

  The relay coil 102 and the capacitor constitute a resonance circuit. The resonance circuit is not connected to other electric loads such as the electric toothbrush 60. The capacitance of the capacitor is set so that the resonance frequency of the resonance circuit matches the reference frequency FK.

The relationship between the coils 102, 64, and 63 will be described with reference to FIG.
The auxiliary coil 64 of the electric toothbrush 60 is located closer to the outer peripheral portion of the relay coil 102 than the center of the relay coil 102 in a state where the electric toothbrush 60 is accommodated in the case 101.

With reference to FIG. 3 and FIG. 10, the power transmission aspect of the non-contact-type power transmission device 10 is demonstrated. In addition, since the supply mode of the electric power from the secondary coil 63 of the electric toothbrush 60 to the secondary battery 66 is the same as that of 1st Embodiment, the description is abbreviate | omitted.
(A) The power transmission control unit 42 of the wash basin 20 supplies alternating power having the reference frequency FK to the primary coil 30 by controlling the transmission circuit 41.
(B) The primary coil 30 generates alternating magnetic flux when supplied with alternating power.
(C) The relay coil 102 of the decorative pouch 100 generates alternating power and alternating magnetic flux of the reference frequency FK by interlinking with the alternating magnetic flux of the primary coil 30.
(D) The auxiliary coil 64 of the electric toothbrush 60 generates alternating power and alternating magnetic flux of the reference frequency FK by interlinking with the alternating magnetic flux of the relay coil 102.

(Effect of embodiment)
The contactless power transmission device 10 of the present embodiment includes the effects (1) to (10) produced by the contactless power transmission device 10 of the first embodiment and the contactless power transmission device 10 of the third embodiment. Produces the same effect as the effect (12).

(Fifth embodiment)
The contactless power transmission device 10 of the present embodiment shown in FIG. 11 has the following differences as main differences from the contactless power transmission device 10 of the first embodiment shown in FIG. That is, the washstand 20 of the first embodiment has one primary coil 30. On the other hand, the wash basin 20 of this embodiment has a plurality of primary coils 30. Below, the detail of a different point from the non-contact-type electric power transmission apparatus 10 of 1st Embodiment is demonstrated, about the structure which is common in the same embodiment, the same code | symbol is attached | subjected and the one part or all part of the description is abbreviate | omitted.

With reference to Fig.11 (a), the structure of the washstand 20 of a state with the door closed is demonstrated.
The wash basin 20 includes a cabinet 110 that houses a washbasin, a central door 111 that opens and closes the central portion of the cabinet 110, a left door 112 that opens and closes the left portion of the cabinet 110, and a right that opens and closes the right portion of the cabinet 110. And a door 113. The cabinet 110, the left door 112, and the right door 113 correspond to “power transmission device”.

  With reference to FIG.11 (b), the structure of the wash basin 20 of a state with the open door is demonstrated. In FIG. 11B, the central door 111 with the central portion of the cabinet 110 opened is omitted.

  The cabinet 110 includes a central switch 114 that detects the open / closed state of the central door 111, a left switch 115 that detects the open / closed state of the left door 112, a right switch 116 that detects the open / closed state of the right door 113, and the coils 121-1. And a power switch 117 for switching a power supply state to 123.

  The cabinet 110 includes a first coil 121 and a first capacitor (not shown) as the primary coil 30, and a first relay coil 131 and a fourth capacitor (not shown). The first coil 121 and the first capacitor are located on the outer peripheral portion of the cabinet 110. The first relay coil 131 and the fourth capacitor are located in the upper left portion in the cabinet 110.

  The first capacitor is connected in series with the first coil 121. The first coil 121 and the first capacitor constitute a first resonance circuit. The fourth capacitor is connected in series with the first relay coil 131. The first relay coil 131 and the fourth capacitor constitute a fourth resonance circuit.

  The left door 112 includes a second coil 122 and a second capacitor (not shown) as the primary coil 30, and a second relay coil 132 and a fifth capacitor (not shown). The second capacitor is connected in series with the second coil 122. The second coil 122 and the second capacitor constitute a second resonance circuit. The fifth capacitor is connected in series to the second relay coil 132. The second relay coil 132 and the fifth capacitor constitute a fifth resonance circuit.

  The right door 113 includes a third coil 123 and a second capacitor (not shown) as the primary coil 30, and a third relay coil 133 and a sixth capacitor (not shown). The third capacitor is connected in series with the third coil 123. The third coil 123 and the third capacitor constitute a third resonance circuit. The sixth capacitor is connected in series with the third relay coil 133. The third relay coil 133 and the sixth capacitor constitute a sixth resonance circuit.

  Each of the coils 121 to 123 is formed as a planar coil having a quadrangle in plan view. Similarly, each of the relay coils 131 to 133 is also formed as a planar coil having a square shape in plan view.

  Each of the coils 121 to 123 corresponds to either “primary coil CA” or “primary coil CB”. That is, when the first coil 121 corresponds to the “primary coil CA”, one of the second coil 122 and the third coil 123 corresponds to the “primary coil CB”. When the second coil 122 corresponds to the “primary coil CA”, one of the first coil 121 and the third coil 123 corresponds to the “primary coil CB”. When the third coil 123 corresponds to the “primary coil CA”, one of the first coil 121 and the second coil 122 corresponds to the “primary coil CB”.

The operation of each of the switches 114 to 117 will be described.
The central switch 114 is turned on by contact with the central door 111 when the central door 111 is closed. On the other hand, when the central door 111 is in an open state, the central door 111 is turned off by being separated.

  The left switch 115 is turned on by contact with the left door 112 when the left door 112 is closed. On the other hand, when the left door 112 is in an open state, the left door 112 is separated to be turned off.

  The right switch 116 is turned on by contact with the right door 113 when the right door 113 is closed. On the other hand, when the right door 113 is in an open state, the right door 113 is turned off by being separated.

  The center switch 114, the left switch 115, and the right switch 116 transmit a signal corresponding to each on state or off state to the power transmission control unit 42 of FIG. The power transmission control unit 42 detects the open / closed state of the doors 111 to 113 based on signals received from the switches 114 to 116.

  The power switch 117 transmits an on signal indicating the on state of the power switch 117 to the power transmission control unit 42 when the on state is selected by a user operation. On the other hand, when the OFF state is selected by the user's operation, an OFF signal indicating the OFF state of the power switch 117 is transmitted to the power transmission control unit 42. The power transmission control unit 42 controls the energization state of the coils 121 to 123 based on the on signal or the off signal received from the power switch 117.

The relationship between the coils 121 to 123 will be described.
(A) The dimension of each side of the second coil 122 is smaller than that of the first coil 121.
(B) The dimension of each side of the third coil 123 is smaller than that of the first coil 121.
(C) The dimensions of the sides of the second coil 122 and the third coil 123 are equal to each other.
(D) The diameters of the conductive wires of the coils 121 to 123 are equal to each other.

The relationship between the relay coils 131 to 133 will be described.
(A) The dimensions of the sides of the relay coils 131 to 133 are equal to each other.
(B) The diameters of the conductive wires of the relay coils 131 to 133 are equal to each other.
(C) The dimension of each side of each relay coil 131-133 is smaller than each coil 121-123.

A circuit configuration of the non-contact power transmission apparatus 10 will be described.
The first resonance circuit of the cabinet 110, the second resonance circuit of the left door 112, and the third resonance circuit of the right door 113 are connected in parallel to each other. The capacitance of the capacitor of each resonance circuit is set so that the resonance frequency of each resonance circuit matches the reference frequency FK.

  The fourth resonance circuit of the cabinet 110, the fifth resonance circuit of the left door 112, and the sixth resonance circuit of the right door 113 are not electrically connected to each other. Each resonance circuit is not electrically connected to other electric loads such as the electric toothbrush 60. The capacitance of the capacitor of each resonance circuit is set so that the resonance frequency of each resonance circuit matches the reference frequency FK.

The positional relationship between the coils 121 to 123 will be described.
The position of the second coil 122 with respect to the first coil 121 varies depending on the position of the left door 112 with respect to the cabinet 110, that is, the opening of the left door 112 with respect to the cabinet 110 (hereinafter, “left door opening”).

  When the left door 112 is closed, that is, when the left door opening is “0”, the distance between the first coil 121 and the second coil 122 is the smallest. On the other hand, when the left door 112 is open, that is, when the left door opening is larger than “0”, the distance between the first coil 121 and the second coil 122 increases as the left door opening increases.

  The position of the third coil 123 with respect to the first coil 121 varies depending on the position of the right door 113 with respect to the cabinet 110, that is, the opening of the right door 113 with respect to the cabinet 110 (hereinafter, “right door opening”).

  When the right door 113 is closed, that is, when the right door opening is “0”, the distance between the first coil 121 and the third coil 123 is the smallest. On the other hand, when the right door 113 is open, that is, when the right door opening is larger than “0”, the distance between the first coil 121 and the third coil 123 increases as the right door opening increases.

With reference to FIG. 11, the power transmission mode of the non-contact power transmission apparatus 10 will be described. In addition, since the supply mode of the electric power from the secondary coil 63 of the electric toothbrush 60 to the secondary battery 66 is the same as that of 1st Embodiment, the description is abbreviate | omitted.
(A) The power transmission control unit 42 of the wash basin 20 supplies alternating power having the reference frequency FK to the first coil 121 to the third coil 123 by controlling the transmission circuit 41.
(B) The first coil 121 to the third coil 123 generate alternating magnetic flux when supplied with alternating power.
(C) The alternating magnetic flux of the first coil 121 generates alternating power and alternating magnetic flux of the reference frequency FK by interlinking with the first relay coil 131.
(D) The alternating magnetic flux of the second coil 122 is linked to the second relay coil 132 to generate alternating power and alternating magnetic flux of the reference frequency FK.
(E) The alternating magnetic flux of the third coil 123 generates alternating power and alternating magnetic flux of the reference frequency FK by interlinking with the third relay coil 133.
(F) At least one of the alternating magnetic fluxes of the relay coils 131 to 133 is linked to the auxiliary coil 64 of the electric toothbrush 60.

The contents of control performed by the power transmission control unit 42 in FIG. 3 will be described.
(A) When the power transmission control unit 42 detects that any one of the doors 111 to 113 is open based on the signal received from each of the switches 114 to 116, and the ON signal received from the power switch 117. Based on the above, when it is detected that the ON state of the power switch 117 is selected, power is supplied to the coils 121 to 123. Thereby, electric power is transmitted to the electric toothbrush 60 from each coil 121-123.

  (B) Based on the signals received from the switches 114 to 116, the power transmission control unit 42 detects that any one of the doors 111 to 113 is open and the off signal received from the power switch 117. On the other hand, when it is detected that the power switch 117 is off, power is not supplied to the coils 121 to 123.

  (C) When the power transmission control unit 42 detects that the doors 111 to 113 are closed based on the signals received from the switches 114 to 116, and based on the response confirmation signal received from the electric toothbrush 60. When it is detected that the electric toothbrush 60 is disposed in the cabinet 110, charging of the secondary battery 66 of the electric toothbrush 60 is started. And when the signal which shows that charge was completed from the electric toothbrush 60 is received, charge of the secondary battery 66 is complete | finished.

  (D) When the power transmission control unit 42 detects that the doors 111 to 113 are closed based on the signals received from the switches 114 to 116, the coils 121 based on the ON signal received from the power switch 117. The supply of power to ˜123 is stopped. That is, when each of the doors 111 to 113 is closed, the transmission of electric power to the electric toothbrush 60 cannot be started by operating the power switch 117.

(Effect of embodiment)
The contactless power transmission device 10 of the present embodiment includes the effects (1) to (10) produced by the contactless power transmission device 10 of the first embodiment and the contactless power transmission device 10 of the third embodiment. In addition to the effect of (13), there are the following effects.

  (14) The non-contact power transmission device 10 includes the first coil 121 to the third coil 123. According to this structure, the transmission range of the electric power to the electric toothbrush 60 can be expanded compared with a wash basin provided with only one primary coil.

  (15) The left door 112 and the right door 113 of the non-contact power transmission apparatus 10 have the second coil 122 or the third coil 123. According to this configuration, when the left door 112 and the right door 113 are open, the transmission range of power from the wash basin 20 to the electric toothbrush 60 is expanded. For this reason, when the user is using the electric toothbrush 60, even if the position of the electric toothbrush 60 with respect to the washstand 20 changes frequently, electric power is appropriately transmitted to the electric toothbrush 60.

(Other embodiments)
The present invention includes embodiments other than the first to fifth embodiments. Hereinafter, the modification of each embodiment as other embodiment of the present invention is shown. The following modifications can be combined with each other.

  In the secondary coil 63 of the first and third to fifth embodiments (FIGS. 1, 8, 10, and 11), one end is in contact with the auxiliary coil 64. On the other hand, the secondary coil 63 of the modification is not in contact with the auxiliary coil 64.

  The secondary coil 63 and the auxiliary coil 64 of the first and third to fifth embodiments (FIGS. 1, 8, 10, and 11) have a coaxial axis. On the other hand, the modified secondary coil 63 and auxiliary coil 64 have axes parallel to each other.

  In the secondary coil 63 of the second embodiment (FIG. 4), one end is not in contact with the auxiliary coil 64. On the other hand, the secondary coil 63 of the modified example has a configuration in which one end is in contact with the auxiliary coil 64.

The secondary coil 63 and the auxiliary coil 64 of the second embodiment (FIG. 4) have axes that are parallel to each other. On the other hand, the secondary coil 63 and the auxiliary coil 64 of the modification have the same axis.
The secondary coil 63 and the auxiliary coil 64 of the first to fifth embodiments (FIGS. 1, 4, 8, 10, and 11) are formed as cylindrical coils. On the other hand, at least one of the modified secondary coil 63 and auxiliary coil 64 is formed as a planar coil.

  The outer diameter of the auxiliary coil 64 in the first to fifth embodiments (FIGS. 1, 4, 8, 10, and 11) is larger than the outer diameter of the secondary coil 63. On the other hand, the outer diameter of the auxiliary coil 64 of the modification has a size equal to or smaller than the outer diameter of the secondary coil 63.

  The diameter of the conductive wire of the auxiliary coil 64 in the first to fifth embodiments (FIGS. 1, 4, 8, 10, and 11) is larger than the diameter of the conductive wire of the secondary coil 63. On the other hand, the diameter of the conductive wire of the auxiliary coil 64 of the modification has a size equal to or smaller than the diameter of the conductive wire of the secondary coil 63.

  The cores 65 and 80 of the first to fifth embodiments (FIGS. 1, 4, 8, 10, and 11) are located in the hollow portions of the auxiliary coil 64 and the secondary coil 63. On the other hand, the cores 65 and 80 of the modified example omit the portion corresponding to the auxiliary coil 64 (first core 81) or the portion corresponding to the secondary coil 63 (second core 82).

  The auxiliary coil 64 and the secondary coil 63 in the first to fifth embodiments (FIGS. 1, 4, 8, 10, and 11) have cores 65 and 80. On the other hand, the auxiliary coil 64 and the secondary coil 63 of the modified example omit the cores 65 and 80.

-The auxiliary | assistant coil 64 and the secondary coil 63 of 1st-5th embodiment (FIG.1, FIG.4, FIG.8, FIG.10 and FIG. 11) have a cylindrical shape. On the other hand, the auxiliary coil 64 and the secondary coil 63 of the modification have a shape shown in FIG.
(A1) As shown in FIG. 12A, the auxiliary coil 64 has a quadrangular shape in plan view. The secondary coil 63 has a circular shape in plan view.
(A2) As shown in FIG. 12B, the auxiliary coil 64 has a quadrangular shape in plan view. The secondary coil 63 has a quadrangular shape in plan view.
(A3) As shown in FIG. 12C, the auxiliary coil 64 has a circular shape in plan view. The secondary coil 63 has a quadrangular shape in plan view.

  The axis JA of the auxiliary coil 64 and the axis JB of the secondary coil 63 in (A1) to (A3) are parallel to each other. On the other hand, the auxiliary coil 64 and the secondary coil 63 of the modified examples (A1) to (A3) are coaxial.

-The auxiliary | assistant coil 64 and the secondary coil 63 of 1st-5th embodiment (FIG.1, FIG.4, FIG.8, FIG.10 and FIG. 11) have a cylindrical shape. On the other hand, the auxiliary coil 64 and the secondary coil 63 of the modified example have the following shapes.
(B1) The auxiliary coil 64 has any shape of a triangle, a quadrangle, and an ellipse in plan view.
(B2) The secondary coil 63 has a shape of any one of a triangle, a quadrangle, and an ellipse in plan view.
(B3) The auxiliary coil 64 includes the coil having any one of the above shapes (B1), and the secondary coil 63 includes the coil having any one of the above shapes (B2).

  The wash basin 20 of the first and second embodiments (FIG. 1) has a first relay coil 31 and a second relay coil 32. On the other hand, the wash basin 20 of the modified example omits at least one of the first relay coil 31 and the second relay coil 32.

  The first relay coil 31 to the third relay coil 33 in the first, second, and fifth embodiments (FIGS. 1, 4, and 11) are located in the washstand 20. On the other hand, at least one of the first relay coil 31 to the third relay coil 33 of the modification has a configuration independent of the washstand 20. In this case, at least one position of the first relay coil 31 to the third relay coil 33 with respect to the washstand 20 can be freely changed.

-The washing machine 91 of 3rd Embodiment (FIG. 8) has one relay coil 92. FIG. On the other hand, the cleaning machine 91 of the modified example has a plurality of relay coils 92.
The cosmetic pouch 100 of the fourth embodiment (FIG. 9) has a relay coil 102 on one surface of the case 101. On the other hand, the cosmetic pouch 100 according to the modified example has relay coils 102 on both sides of the case 101.

The wash basin 20 of the first to fourth embodiments (FIGS. 1, 4, and 7) has one primary coil 30. On the other hand, the wash basin 20 of the modified example has a plurality of primary coils 30.
-The cabinet 110 of 5th Embodiment (FIG. 11) has the 1st coil 121-the 3rd coil 123. FIG. On the other hand, in the cabinet 110 of the modified example, one or two of the first coil 121 to the third coil 123 are omitted. In this cabinet 110, the relay coil corresponding to the omitted coil can be omitted.

  The relay coils 31 to 33 or the relay coils 131 to 133 in the first to fifth embodiments (FIGS. 1, 4, 8, 10, and 11) are not connected to an electric load. On the other hand, at least one of the relay coils 31 to 33 according to the modification, or at least one of the relay coils 131 to 133 is connected to another electric load. In this configuration, when a light emitting diode is provided as another electric load, the light emitting diode is turned on by the magnetic flux interlinking with each relay coil 31 to 33 or each relay coil 131 to 133.

  The electric toothbrush 60 or the electric razor 90 of the first to fifth embodiments (FIGS. 1, 4, 8, 10, and 11) has cores 65 and 80. On the other hand, the electric toothbrush 60 or the electric razor 90 of a modification has the structure in any one of the following (C1)-(C4).

  (C1) As shown in FIG. 13A, the auxiliary coil 64 has a pot core 140 instead of the cores 65 and 80. The secondary coil 63 is located in a space closer to the primary coil 30 than the auxiliary coil 64 in the axial direction X of the electric toothbrush 60. The secondary coil 63 has a shape as a circular planar coil.

  As shown in FIG. 13B, the pot core 140 includes a bottom wall 141 that covers the entire auxiliary coil 64 from the axial direction X of the electric toothbrush 60, an inner wall 142 that is inserted into a hollow portion of the auxiliary coil 64, and an electric motor. And an outer wall 143 that covers the auxiliary coil 64 from the width direction Y of the toothbrush 60.

  According to this configuration, since the pot core 140 has the bottom wall 141 and the outer wall 143, the leakage of magnetic flux between the primary coil 30 and the auxiliary coil 64 compared to the configuration in which the auxiliary coil 64 has the cores 65 and 80. The amount is reduced.

  (C2) An auxiliary coil 64 as a modified example of the configuration of (C1) has an EER core 150 shown in FIG. The EER core 150 includes a rectangular bottom wall 151 that covers a part of the auxiliary coil 64 in FIG. 13A from the axial direction X of the electric toothbrush 60 and a cylindrical inner wall 152 that is inserted into a hollow portion of the auxiliary coil 64. And a pair of outer walls 153 covering the auxiliary coil 64 from the width direction Y of the electric toothbrush 60.

  According to this configuration, since the EER core 150 has the bottom wall 151 and the outer wall 153, the magnetic flux between the primary coil 30 and the auxiliary coil 64 is reduced compared to the configuration in which the auxiliary coil 64 has the cores 65 and 80. Leakage is reduced.

  (C3) As shown in FIG. 15A, the auxiliary coil 64 has an EE core 160 instead of the cores 65 and 80. The secondary coil 63 is located in a space closer to the primary coil 30 than the auxiliary coil 64 in the axial direction X of the electric toothbrush 60. A part of the secondary coil 63 is inserted into the EE core 160.

  As shown in FIG. 15B, the EE core 160 is inserted into a rectangular bottom wall 161 that covers a part of the auxiliary coil 64 from the axial direction X of the electric toothbrush 60 and a hollow portion of the auxiliary coil 64. A rectangular inner wall 162 and a pair of rectangular outer walls 163 covering the auxiliary coil 64 from the width direction Y of the electric toothbrush 60 are provided.

  According to this configuration, since the EE core 160 has the bottom wall 161 and the outer wall 163, the magnetic flux between the primary coil 30 and the auxiliary coil 64 is reduced compared to the configuration in which the auxiliary coil 64 has the cores 65 and 80. Leakage is reduced. Further, since the secondary coil 63 is inserted into the outer wall 163 of the EE core 160, the leakage of magnetic flux between the auxiliary coil 64 and the secondary coil 63 compared to a configuration in which the secondary coil 63 is not inserted into the outer wall 163. The amount is reduced.

  (C4) As shown in FIG. 16, the secondary coil 63 includes a magnetic sheet 170 instead of the cores 65 and 80. The auxiliary coil 64 is located in a space closer to the primary coil 30 than the secondary coil 63 in the axial direction X of the electric toothbrush 60. The outer diameter of the auxiliary coil 64 is larger than the outer diameter of the secondary coil 63.

  In the modified example of the configuration (C4), the auxiliary coil 64 has a magnetic sheet (not shown). In this case, the length of each side of the magnetic sheet is larger than the outer diameter of the auxiliary coil 64. Further, the secondary coil 63 is located in the primary coil 30 with respect to the auxiliary coil 64 in the axial direction X of the electric toothbrush 60.

The auxiliary coil 64 and the secondary coil 63 as modified examples of the configurations (C1) to (C4) have the same axis.
The secondary coil 63 and the auxiliary coil 64 as modified examples of the configurations (C1) to (C3) have a configuration in which end portions of the respective coils are in contact with each other.

The auxiliary coil 64 and the secondary coil 63 as a modified example of the configuration (C4) have a configuration in which the end portions of the respective coils are not in contact with each other.
The auxiliary coil 64 and the secondary coil 63 in the first to fifth embodiments (FIGS. 1, 4, 8, 10, and 11) have cores 65 and 80. On the other hand, the auxiliary coil 64 and the secondary coil 63 of the modified example have a core 180 shown in FIG.

  The core 180 has a first core 181 that is inserted into the hollow portion of the auxiliary coil 64 and a second core 182 that is inserted into the hollow portion of the secondary coil 63. The first core 181 and the second core 182 are individually formed. The second core 182 is fixed to the end surface of the first core 181 in the axial direction X of the electric toothbrush 60. A magnetic material is used as the material of the first core 181 and the second core 182. The magnetic permeability of the second core 182 is smaller than the magnetic permeability of the first core 181.

  The non-contact power transmission device 10 having the core 180 can increase the Q value of the auxiliary coil 64 by increasing the magnetic permeability of the first core 181. When the Q value of the auxiliary coil 64 is increased, it is not necessary to increase the Q value of the secondary coil 63, and therefore it is permitted to use the second core 182 having a low magnetic permeability. When the second core 182 having a low magnetic permeability is used, the cost for the core is reduced.

  As described above, the non-contact power transmission device 10 is suitable for the auxiliary coil 64 and the secondary coil 63 from the viewpoint of Q value and cost because the first core 181 and the second core 182 are individually formed. A core can be selected.

  The wash basin 20 of the first to fifth embodiments (FIGS. 1, 6, 9, and 11) has a primary coil 30. On the other hand, the wash basin 20 of the modification has a primary coil 190 shown in FIG.

  As shown in FIG. 18A, the primary coil 190 includes a plurality of linear portions 191 that are parallel to each other, and a connecting portion 192 that connects the ends of adjacent linear portions 191 to each other and is orthogonal to the linear portions 191. Have

  As shown in FIG. 18B, the directions of the currents flowing through the primary coil 190 are opposite to each other in the adjacent linear portions 191. For this reason, the magnetic fluxes generated in the adjacent linear portions 191 strengthen each other. Moreover, the non-contact power transmission device 10 having the primary coil 190 of FIG. 18 has the following effects.

  Since a planar coil having a circular shape in plan view has a configuration in which conductive wires are laminated in the radial direction, when the coil is manufactured by a winding machine or by manual work, the contact state between adjacent conductive wires in the radial direction is the entire coil. It is required to work while maintaining the shape of the curved portion so as to be uniform over the entire area. On the other hand, the primary coil 190 is formed by a plurality of linear portions 191 and a plurality of connection portions 192. That is, unlike the circular coil having the circular shape, it does not have a spiral portion.

  For this reason, at the time of manufacturing the primary coil 190, it is not necessary to proceed with work while maintaining the shape of the curved portion so that the contact state between adjacent conductive wires is uniform over the entire coil. That is, since the accuracy required for the work at the time of manufacture is lower than that of the flat coil having the circular shape, labor for manufacturing is reduced.

  -The modification of the structure which has the primary coil 190 of FIG. That is, the primary coil 190 of the modification has a non-spiral wiring configuration. Note that the non-spiral wiring form includes a wiring form other than the planar coil wiring form having a spiral shape in plan view. The spiral shape includes a shape in which a plurality of annular portions are formed by conductive wires. The annular portion includes a circle, a similar shape, a polygon, and a similar shape.

  -The axis | shaft of the relay coil 92 in the washing machine 91 of 3rd Embodiment (FIG. 8) is parallel to the axis | shaft of the primary coil 30. FIG. On the other hand, the axis of the relay coil 92 in the cleaning machine 91 of the modification is orthogonal to the axis of the primary coil 30 as shown in FIG. The auxiliary coil 64 and the secondary coil 63 of the electric razor 90 are formed as planar coils.

  The electric toothbrush 60 or the electric razor 90 of the first to fifth embodiments (FIGS. 1, 4, 8, 10, and 11) has a secondary battery 66. On the other hand, in the modified electric toothbrush 60 or electric razor 90, the secondary battery 66 is omitted. The electric toothbrush 60 or the electric razor 90 directly supplies the current of the secondary coil 63 to the electric motor 67. The wash basin 20 corresponding to this configuration transmits electric power to the electric toothbrush 60 when the electric motor 67 is driven.

  The present invention is applied to a power receiving device other than the electric toothbrush 60 exemplified in the first, second, fourth, and fifth embodiments (FIGS. 1, 4, 10, and 11). You can also. Examples of other power receiving devices include an electric razor, a nose hair cutter, and a dryer. This power receiving apparatus has a configuration according to the first, second, fourth, and fifth embodiments. In addition, the same effects as those of the first, second, fourth, and fifth embodiments are achieved.

  -This invention is applied to power transmission apparatuses other than the left mirror 21A of the washstand 20 as a power transmission apparatus illustrated by 1st-5th embodiment (FIG.1, FIG.7, FIG.9 and FIG.11). You can also. As another power transmission device, for example, an interior part of a kitchen or a vehicle can be cited. This power transmission device has a configuration according to the first to fifth embodiments. Moreover, there exists an effect according to the effect of 1st-5th embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Non-contact-type electric power transmission apparatus, 20 ... Wash-stand (power transmission apparatus), 24 ... Mounting base (power transmission apparatus), 31 ... 1st relay coil, 32 ... 2nd relay coil, 33 ... 3rd relay coil, 60 ... Electric toothbrush (power receiving device), 63 ... secondary coil, 64 ... auxiliary coil, 73 ... rectifier circuit (power feeding circuit), 74 ... power feeding control unit (power feeding circuit), 90 ... electric shaver (power receiving device), 92 ... relay coil , 102 ... Relay coil, 110 ... Cabinet (power transmission device), 112 ... Left door (power transmission device), 113 ... Right door (power transmission device), 121 ... First coil (primary coil), 122 ... Second coil (1 Secondary coil), 123 ... third coil (primary coil), 131 ... first relay coil, 132 ... second relay coil, 133 ... third relay coil, 190 ... primary coil.

Claims (6)

A non-contact power transmission device provided with a power transmission device having a primary coil, a power reception device having a secondary coil and a power feeding circuit, and supplying a current generated in the secondary coil to the power feeding circuit In
The power receiving device includes an auxiliary coil not electrically connected to the power feeding circuit;
And the relay coil which relays the flow of the magnetic flux from the said primary coil to the said auxiliary | assistant coil is provided between the said power transmission apparatus and the said power receiving apparatus. The non-contact-type power transmission apparatus characterized by the above-mentioned. The contactless power transmission device according to claim 1,
The power transmission device includes a plurality of the primary coils;
In addition, the non-contact power transmission device, wherein magnetic fluxes of the plurality of primary coils are linked to the relay coil. The contactless power transmission device according to claim 2,
The positional relationship between the primary coil CA and the primary coil CB can be changed by using one of the plurality of primary coils as the primary coil CA and another as the primary coil CB. A non-contact power transmission device characterized by the above. In the non-contact-type electric power transmission apparatus as described in any one of Claims 1-3,
A non-contact power transmission device comprising a plurality of the relay coils. In the non-contact power transmission device according to any one of claims 1 to 4,
The relay coil is configured as a separate member from the power transmission device;
And a winding diameter of the relay coil is smaller than a winding diameter of the primary coil. In the non-contact power transmission device according to any one of claims 1 to 5,
The non-contact power transmission device, wherein the relay coil is not connected to an electrical load.