TWI495223B - Contactless power transmission device - Google Patents

Description

Non-contact power transmission device Field of invention

The present invention relates to a non-contact power transmission device having a power transmission device including a primary coil, and a power receiving device including a secondary coil and a circuit that can receive a current generated by the secondary coil.

Background of the invention

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 and the secondary coil. The current of the secondary coil is then supplied to the circuit to charge the secondary battery.

Advanced technical literature Non-patent literature

[Patent Document] Japanese Patent No. 3416863.

Summary of invention

It is desirable in the contactless power transmission device to increase the transmission distance. However, the non-contact power transmission device in Patent Document 1 is not particularly considered for increasing the distance.

The present invention has been made to solve the above problems, and an object of the invention is to provide a non-contact power transmission device capable of increasing a transmission distance.

In order to solve the above problems, the non-contact power transmission device according to the first aspect of the present invention includes: a power transmitting device including a primary coil; and a power receiving device including a secondary coil and a current that can be generated by the secondary coil The circuit breaker includes an auxiliary coil that is not electrically connected to the circuit. The auxiliary coil and the secondary coil should be coaxially arranged. The axis of the auxiliary coil and the axis of the secondary coil are preferably arranged in parallel with each other. The auxiliary coil and the secondary coil should preferably be out of contact. At least one of the auxiliary coil and the secondary coil preferably has a circular shape in plan view. At least one of the auxiliary coil and the secondary coil preferably has a quadrangular shape in plan view.

Further, the non-contact power transmission device according to the second embodiment of the present invention includes: a power transmitting device including a primary coil; and a power receiving device including a secondary coil and a current that can be generated by the secondary coil. In the circuit, the power receiving device includes an auxiliary coil that is not electrically connected to the circuit, and the primary coil has a non-swirl wiring configuration. The primary coil includes a first linear portion and a second linear portion that are parallel to each other, and a connecting portion that connects the first linear portion and the second linear portion, and the connecting portion preferably has an end portion of the first linear portion. And an end portion of the second linear portion that faces the end portion of the first linear portion is connected to each other.

Further, the non-contact power transmission device according to the third embodiment of the present invention includes: a power transmitting device including a primary coil; and a power receiving device including a secondary coil and a current that can be generated by the secondary coil. Circuit The power receiving device includes an auxiliary coil that is not electrically connected to the circuit, and at least one of the auxiliary coil and the secondary coil includes a magnetic body.

Further, a non-contact power transmission device according to a fourth embodiment of the present invention includes: a power transmitting device including a primary coil; and a power receiving device including a secondary coil and a current that can be generated by the secondary coil. In the circuit, the power receiving device includes an auxiliary coil that is not electrically connected to the circuit, and only the auxiliary coil includes a magnetic body among the secondary coil and the auxiliary coil.

Further, the non-contact power transmission device according to the fifth embodiment of the present invention includes: the power transmitting device includes a primary coil; and the power receiving device includes a secondary coil and a current that can be generated by the secondary coil. In the circuit, the power receiving device includes an auxiliary coil that is not electrically connected to the circuit, and only two of the secondary coil and the auxiliary coil include a magnetic body.

Further, a non-contact power transmission device according to a sixth embodiment of the present invention includes: a power transmitting device including a primary coil; and a power receiving device including a secondary coil and a current that can be generated by the secondary coil. In the circuit, the power receiving device includes an auxiliary coil that is not electrically connected to the circuit, and the auxiliary coil and the secondary coil include a common magnetic body.

Further, a non-contact power transmission device according to a seventh embodiment of the present invention includes: a power transmitting device including a primary coil; and a power receiving device including a secondary coil and a current that can be generated by the secondary coil. In the circuit, the power receiving device includes an auxiliary coil that is not electrically connected to the circuit, and the secondary coil includes the first magnetic body, and the auxiliary coil includes the second magnetic body. In the third to seventh embodiments, the magnetic body preferably includes a can core. Further, the magnetic body preferably includes an E core. Moreover, the auxiliary coil and the secondary coil are individually hollow In part, the magnetic body preferably includes a columnar core inserted into at least one of a hollow portion of the auxiliary coil and a hollow portion of the secondary coil.

Further, the non-contact power transmission device according to the eighth embodiment of the present invention includes: the power transmitting device includes a primary coil; and the power receiving device includes a secondary coil and a circuit that can receive a current generated by the secondary coil. Further, the power receiving device includes an auxiliary coil that is not electrically connected to the circuit; and the relay coil is disposed between the power transmitting device and the power receiving device, and can relay the flow of the magnetic flux from the primary coil to the auxiliary coil. The power transmitting device includes a plurality of primary coils, and the magnetic flux of the plurality of primary coils is preferably interconnected with the relay coil. The first coil of the plurality of coils includes the first coil and the second coil, and the first coil and the second coil are preferably arranged to change the positional relationship between each other. It is preferable that the relay coil is one of a plurality of relay coils. The relay coil is independently provided from the power transmitting device, and the relay coil has a smaller winding diameter than the primary coil. It is preferable that the relay coil is not connected to an electrical load.

The present invention provides a non-contact power transmission device that can increase the transmission distance.

10, 210‧‧‧ Non-contact power transmission device

20‧‧‧Power transmission device

21, 121, 124, 125, 126, 230‧‧1 times coil

22, 100, 234‧‧‧ magnetic sheets

23‧‧‧ housing

30, 240‧‧1 circuit

31‧‧‧Transmission circuit

32‧‧‧Control Department

33, 52, 243‧ ‧ capacitors

34, 51, 244, 254~256‧‧‧ resonant circuit

40, 260‧‧‧ electric toothbrush

41‧‧‧ body shell

42‧‧‧Accessories

42A‧‧‧ brush part

43‧‧2 times coil

44‧‧‧Auxiliary coil

45, 60‧‧‧ magnetic core

46‧‧‧2 batteries

47‧‧‧Electric motor

50, 270‧‧2 circuits

53‧‧‧Rectifier circuit

61‧‧‧1st core

62‧‧‧2nd core

70‧‧‧ can core

71‧‧‧ bottom wall

72‧‧‧ inner wall

73‧‧‧ outer wall

80‧‧‧EER core

81‧‧‧ bottom wall

82‧‧‧ inner wall

83‧‧‧ outer wall

90‧‧‧EE core

91‧‧‧ bottom wall

92‧‧‧ inner wall

93‧‧‧ outer wall

110‧‧‧Magnetic core

111‧‧‧1st core

112‧‧‧2nd core

121A‧‧‧Line section

121B‧‧‧Connected section

124A‧‧‧ wavy part

124B‧‧‧Connected section

125A‧‧‧ bellows

125B‧‧‧Connected section

126A‧‧‧Arc section

126B‧‧‧Connected section

220‧‧‧Washing table

221‧‧ Mirror

221A‧‧‧left mirror

221B‧‧‧right mirror

222‧‧‧Washing table

223‧‧‧Sink

224‧‧‧mounting table

225‧‧‧Support table

226‧‧‧Lighting appliances

231, 531‧‧‧1st relay coil

232, 532‧‧‧2nd relay coil

233, 533‧‧‧3rd relay coil

241‧‧‧Transmission circuit

242‧‧‧Power Transmission Control Department

245‧‧1 antenna

251‧‧‧1st relay circuit

252‧‧‧2nd relay circuit

253‧‧‧3rd relay circuit

274‧‧‧Power Supply Control Department

275‧‧2nd antenna

390‧‧‧Electric razor

391‧‧‧Washing machine

392, 402‧‧‧Relay coil

400‧‧‧ cosmetic bag

401‧‧‧shell

510‧‧‧ cabinet

511‧‧‧Central Gate

512‧‧‧Left door

513‧‧‧The right door

514‧‧‧Central switch

515‧‧‧Left switch

516‧‧‧right switch

517‧‧‧Power switch

521‧‧‧1 first coil of coil 230

522‧‧‧1 second coil of coil 230

523‧‧‧1rd third coil of coil 230

JA‧‧‧2 coil 43 axis

JB‧‧‧Axis of auxiliary coil 44

JC‧‧1 times coil axis 21

G1, G2‧‧‧ distance between coils

L1~L3, K1~K3‧‧‧ curves

Y‧‧‧The direction of the width of the electric toothbrush 40

X1‧‧‧Axis direction of power transmission device 20

X2‧‧‧ electric toothbrush 40 long direction

1 is a schematic cross-sectional view showing a state in which an electric toothbrush is placed on a power transmitting device in the non-contact power transmission device according to the first embodiment of the present invention.

Fig. 2 is a schematic circuit diagram of a non-contact power transmission device according to a first embodiment of the present invention.

Figure 3 is a diagram showing the non-contact power transmission of the second embodiment of the present invention. A schematic cross-sectional view of a portion of the power transmitting device and the electric toothbrush in the delivery device.

Fig. 4 is a graph showing the relationship between load impedance and transmission efficiency in the non-contact power transmission device according to the second embodiment of the present invention.

5(a) to 5(c) are graphs showing the relationship between the distance between the axes and the transmission efficiency in the non-contact power transmission device according to the second embodiment of the present invention.

6(a) to 6(c) are schematic plan views showing a plan view of an auxiliary coil and a secondary coil in the non-contact power transmission device according to another embodiment of the present invention.

Fig. 7(a) is a schematic cross-sectional view showing a primary coil, an auxiliary coil, a secondary coil, and a can core in the non-contact power transmission device according to another embodiment of the present invention.

Fig. 7(b) is a schematic plan view showing a can core in the non-contact power transmission device according to another embodiment of the present invention.

Fig. 8 is a perspective view showing a transmissive structure of an EER core in a non-contact power transmission device according to another embodiment of the present invention.

Fig. 9(a) is a cross-sectional view showing a cross-sectional structure of a primary coil, an auxiliary coil, a secondary coil, and an EE core in the non-contact power transmission device according to another embodiment of the present invention.

Fig. 9(b) is a schematic perspective view of an EE core for a non-contact power transmission device according to another embodiment of the present invention.

Fig. 10 is a schematic cross-sectional view showing a primary coil, an auxiliary coil, a secondary coil, and a magnetic sheet of the non-contact power transmission device according to another embodiment of the present invention.

Figure 11 is a diagram of non-contact power for other embodiments of the present invention. A schematic cross-sectional view of the auxiliary coil, the secondary coil, and the core of the conveyor.

Fig. 12(a) is a schematic plan view of a primary coil and a magnetic piece of the non-contact power transmission device according to another embodiment of the present invention.

Fig. 12(b) is a partial cross-sectional view taken along line A-A of Fig. 12(a) of the non-contact power transmission device according to another embodiment of the present invention.

Fig. 13 (a) is a schematic plan view of a primary coil having a plurality of straight portions in a non-contact power transmission device according to another embodiment of the present invention.

Fig. 13(b) is a schematic plan view showing a primary coil having a complex wavy portion of the non-contact power transmission device according to another embodiment of the present invention.

Fig. 13 (c) is a schematic plan view of a primary coil having a plurality of bellows-shaped portions of the non-contact power transmission device according to another embodiment of the present invention.

Fig. 13 (d) is a schematic plan view of a primary coil having a plurality of circular arc portions in the non-contact power transmission device according to another embodiment of the present invention.

Fig. 14 is a schematic perspective view showing a part of a washstand constituting the same device in the non-contact power transmission device according to the third embodiment of the present invention.

Figure 15 is a cross-sectional view showing a schematic portion of a portion of a washstand and an electric toothbrush in a non-contact power transmission device according to a third embodiment of the present invention.

Figure 16 is a schematic circuit diagram of a non-contact power transmission device according to a third embodiment of the present invention.

Fig. 17 is a schematic perspective view showing a part of a washstand in the non-contact power transmission device according to the fourth embodiment of the present invention.

Figure 18 is a view showing the positions of the primary coil, the relay coil, the auxiliary coil, and the secondary coil in the non-contact power transmission device according to the fourth embodiment of the present invention. Schematic diagram of the relationship.

Fig. 19 is a schematic front view showing a cosmetic bag in the non-contact power transmission device according to the fifth embodiment of the present invention.

Figure 20 is a schematic cross-sectional view showing a portion of an electric toothbrush and its periphery in a non-contact power transmission device according to a fifth embodiment of the present invention.

Fig. 21(a) is a schematic perspective view showing a state in which the door of the washstand is closed in the non-contact power transmission device according to the sixth embodiment of the present invention.

Fig. 21(b) is a schematic perspective view showing a state in which the door of the washing table of the 21st (a) is opened in the non-contact power transmission device according to the sixth embodiment of the present invention.

Detailed description of the preferred embodiment

The overall configuration of the non-contact power transmission device 10 according to the first embodiment of the present invention will be described with reference to Fig. 1.

The non-contact power transmission device 10 includes a power transmission device 20 including a primary coil 21 and an electric toothbrush 40 including a secondary coil 43. The power transmitting device 20 transmits power to the secondary battery 46 through the secondary coil 43 of the electric toothbrush 40 by electromagnetic induction. The electric toothbrush 40 corresponds to a "power receiving device".

Here, the directions of the non-contact power transmission device 10 are defined as follows:

(A) The axial direction of the primary coil 21 of the power transmitting device 20 is "axial direction X1".

(B) The length direction of the electric toothbrush 40 is "axis direction X2".

(C) making the axial direction X2 of the front view of the electric toothbrush 40 positive The direction of intersection is "width direction Y".

The power transmitting device 20 has a casing 23 constituting the main body of the device 20 and a magnetic piece 22 for suppressing leakage of the magnetic flux of the primary coil 21. The magnetic piece 22 is located between the bottom wall of the casing 23 and the primary coil 21 and is opposite to the primary coil 21 and the electric toothbrush 40 in the axial direction X1 of the power transmitting device 20. The primary coil 21 is formed as a planar coil having a circular shape in plan view. The length of each side of the magnetic piece 22 is larger than the outer diameter of the primary coil 21.

The electric toothbrush 40 has a main body casing 41 that is held by a user, and a fitting 42 that can be attached to and removed from the main body casing 41. The fitting 42 has a brush body portion 42A in which a bundle of bristles is planted. The brush body portion 42A is located at the front end portion of the fitting 42.

The electric toothbrush 40 is a secondary coil 43 including an auxiliary coil 44 that intersects the magnetic flux of the primary coil 21, a secondary coil 43 that is interlinked with the magnetic flux of the auxiliary coil 44, and a magnetic core 45 formed of a magnetic material. Further, the electric toothbrush 40 includes a secondary battery 46 that serves as a power source for the electric toothbrush 40, and an electric motor 47 that vibrates the accessory 42. The auxiliary coil 44, the secondary coil 43, the core 45, the secondary battery 46, and the electric motor 47 are disposed inside the main body casing 41.

The secondary coil 43 is formed in a cylindrical coil having a circular shape in plan view. That is, the secondary coil 43 has a configuration in which a plurality of circular portions are laminated in the axial direction X2.

The auxiliary coil 44 is formed in a cylindrical coil having a circular shape in plan view. That is, the auxiliary coil 44 has a configuration in which a plurality of circular portions are laminated in the axial direction X2.

The secondary coil 43 and the auxiliary coil 44 have a cylindrical core 45. The core 45 is inserted into the hollow portion of the secondary coil 43 and the auxiliary coil 44. That is, the secondary coil 43 and the auxiliary coil 44 are configured as a core coil having a common core 45.

The relationship between each of the coils 21, 43, and 44 is as follows.

(A) The outer diameter of the primary coil 21 is larger than the outer diameter of the secondary coil 43.

(B) The outer diameter of the primary coil 21 is larger than the outer diameter of the auxiliary coil 44.

(C) The outer diameter of the auxiliary coil 44 is larger than the outer diameter of the secondary coil 43.

(D) The diameter of the wire of the primary coil 21 is larger than the diameter of the wire of the secondary coil 43.

(E) The diameter of the wire of the primary coil 21 is larger than the diameter of the wire of the auxiliary coil 44.

(F) The diameter of the wire of the auxiliary coil 44 is larger than the diameter of the wire of the secondary coil 43.

(G) The number of turns of the primary coil 21 is larger than the number of turns of the secondary coil 43.

(H) The number of turns of the primary coil 21 is equal to the number of turns of the auxiliary coil 44.

(I) The auxiliary coil 44 is disposed coaxially with the secondary coil 43.

The relationship between the above (D) and (H) is such that the Q value of the auxiliary coil 44 is larger than the Q value of the secondary coil 43. The relationship of the above (I) can be increased by the coupling coefficient between the secondary coil 43 and the auxiliary coil 44 (hereinafter referred to as "receiving coupling coefficient") as compared with the configuration in which the secondary coil 43 and the auxiliary coil 44 are not coaxially arranged.

The circuit configuration of the non-contact power transmission device 10 will be described with reference to Fig. 2 .

The power transmitting device 20 has a primary circuit 30 that can control the power supplied to the primary coil 21. The electric toothbrush 40 is controllable by the power transmitting device 20 The secondary circuit 50 of the transmitted power.

The primary circuit 30 includes a transmission circuit 31 that supplies AC power to the primary coil 21, a control unit 32 that controls the transmission circuit 31, a primary coil 21 that is connected to the transmission circuit 31, and a primary coil 21 that is connected in series with the primary coil 21. Capacitor 33. The transmission circuit 31 has a plurality of transistors connected to the primary coil 21. The primary coil 21 and the capacitor 33 constitute a primary side resonance circuit 34.

The secondary circuit 50 has an auxiliary coil 44 that forms a magnetic circuit between the primary coil 21, a secondary coil 43 that forms a magnetic circuit with the auxiliary coil 44, and an alternating current that is generated in the secondary coil 43. DC rectifier circuit 53. Further, the secondary circuit 50 has a capacitor 52 in which the auxiliary coil 44 is connected in series.

The rectifier circuit 53 has a rectifier bridge formed by combining four diodes and a capacitor for smoothing a current through the rectifier bridge. The auxiliary coil 44 and the capacitor 52 constitute a secondary side resonance circuit 51. The capacitance of the capacitor 52 is set such that the resonance frequency of the secondary side resonance circuit 51 coincides with the reference frequency FK.

The rectifier circuit 53 is electrically connected to the secondary coil 43 and the secondary battery 46. On the other hand, the rectifier circuit 53 is not electrically connected to the secondary side resonance circuit 51. Therefore, the impedance of the auxiliary coil 44 becomes smaller as compared with the case where the resonant circuit and the rectifying circuit are electrically connected.

The power transmission aspect of the non-contact power transmission device 10 will be described with reference to FIG.

The control unit 32 of the power transmitting device 20 supplies the alternating current of the reference frequency FK to the primary coil 21 by controlling the transmission circuit 31. Take this line Ring 21 produces an alternating magnetic flux.

The auxiliary coil 44 generates an alternating current and an alternating magnetic flux of the reference frequency FK by interlinking the alternating magnetic flux with the primary coil 21. At this time, the alternating current and the alternating magnetic flux generated in the auxiliary coil 44 are larger than the case where the rectifier circuit and the resonant circuit are electrically connected. Further, the Q value of the auxiliary coil 44 is higher than the Q value of the secondary coil 43, whereby the AC magnetic flux of the primary coil 21 may not be interlinked with the secondary coil 43 or may be slightly interlinked with the secondary coil 43.

The secondary coil 43 generates an alternating current by interlinking the alternating magnetic flux with the auxiliary coil 44. The rectifier circuit 53 converts the alternating current of the secondary coil 43 into a direct current, and supplies the direct current to the secondary battery 46.

The non-contact power transmission device 10 of the first embodiment can achieve the following effects.

(1) The auxiliary coil 44 of the non-contact power transmission device 10 is not electrically connected to the rectifier circuit 53. According to this configuration, the current and the magnetic flux of the auxiliary coil 44 which are generated by the primary coil 21 and the auxiliary coil 44 being mutually interlocked are larger than the case where the auxiliary coil 44 is electrically connected to the rectifier circuit. In other words, in the case where the magnetic flux of the primary coil 21 and the secondary coil 43 are mutually interlocked, the magnetic flux generated in the primary coil 21 in the electric toothbrush 40 is initially interlinked with the coil (auxiliary coil 44). The current and flux will become larger. Thereby, the current of the secondary coil 43 generated by the magnetic flux of the auxiliary coil 44 and the secondary coil 43 intersecting each other becomes larger, so that the transmission distance can be increased.

(2) The auxiliary coil 44 and the secondary coil 43 of the non-contact power transmission device 10 are coaxially arranged. According to this configuration, as compared with the case where the auxiliary coil 44 and the secondary coil 43 are not coaxially arranged, the electric coupling coefficient becomes large. Therefore, the current of the secondary coil 43 generated by the auxiliary coil 44 becomes large.

(3) The auxiliary coil 44 and the secondary coil 43 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 44 and the secondary coil 43 can be reduced as compared with a configuration in which a shape other than a circle in a plan view, for example, a triangle or a quadrangle is used.

(4) The auxiliary coil 44 of the non-contact power transmission device 10 has a magnetic core 45. With this configuration, the amount of leakage of the magnetic flux between the primary coil 21 and the auxiliary coil 44 is reduced as compared with the case of using the auxiliary coil 44 having no magnetic core.

(5) The secondary coil 43 of the non-contact power transmission device 10 has a magnetic core 45. With this configuration, the amount of leakage of the magnetic flux between the auxiliary coil 44 and the secondary coil 43 is reduced as compared with the case of using the secondary coil 43 having no magnetic core.

(6) The auxiliary coil 44 and the secondary coil 43 of the non-contact power transmission device 10 have a common core 45. According to this configuration, the number of cores can be reduced as compared with the case where the auxiliary coil and the secondary coil individually have a magnetic core.

(7) The auxiliary coil 44 and the secondary coil 43 of the non-contact power transmission device 10 have a magnetic core 45 inserted into a hollow portion. According to this configuration, the size of the electric toothbrush 40 can be reduced as compared with the case of using the magnetic core in which the auxiliary coil 44 and the secondary coil 43 are covered by the outer side.

The non-contact power transmission device 10 of the second embodiment shown in Fig. 3 is mainly different from the non-contact power transmission device 10 of the first embodiment shown in Fig. 1 in the following points. In other words, the auxiliary coil 44 and the secondary coil 43 of the electric toothbrush 40 of the first embodiment are coaxial. Configuration. On the other hand, the auxiliary coil 44 and the secondary coil 43 of the electric toothbrush 40 of the second embodiment have axes parallel to each other. In the following, the details of the difference from the non-contact power transmission device 10 of the first embodiment will be described, and the same components as those of the first embodiment will be denoted by the same reference numerals, and a part or all of the description will be omitted.

The electric toothbrush 40 replaces the core 45 with a magnetic core 60 formed of a magnetic material. The core 60 includes a cylindrical first core 61 inserted into a hollow portion of the auxiliary coil 44, and a cylindrical second core 62 inserted into a hollow portion of the secondary coil 43.

The second core 62 has an end portion protruding from the end surface of the first core 61 in the axial direction X2 of the electric toothbrush 40. The central axis of the second core 62 is eccentric to the central axis of the first core 61. Therefore, the circumferential mandrel of the secondary coil 43 is eccentric to the central axis of the auxiliary coil 44.

The relationship between the coils 21, 43, and 44 is shown below. However, the inter-coil distance G1 indicates the distance between the end of the auxiliary coil 44 and the end of the secondary coil 43 in the axial direction X2 of the electric toothbrush 40. Further, the inter-coil distance G2 indicates the distance between the end portion of the auxiliary coil 44 and the end portion of the primary coil 21 in the axial direction X2 of the electric toothbrush 40.

(A) The axis JA of the secondary coil 43 and the axis JB of the auxiliary coil 44 are parallel to each other. (B) One end portion of the auxiliary coil 44 is not in contact with one end portion of the secondary coil 43. (C) The inter-coil distance G1 is smaller than the inter-coil distance G2.

The relationship of the above (A) can reduce the electric coupling coefficient as compared with the case where the secondary coil 43 and the auxiliary coil 44 are coaxially arranged. The relationship of the above (B) can reduce the electric coupling coefficient.

The electric coupling coefficient is related to each of the following: the distance between the axis JA of the secondary coil 43 and the axis JB of the auxiliary coil 44 in the radial direction of the secondary coil 43 and the auxiliary coil 44 (hereinafter referred to as "diameter" Directional distance R"); and distance G1 between coils. The specific relationship is shown below.

(A) The electric coupling coefficient is smaller as the radial direction distance R is larger.

(B) The electric coupling coefficient is smaller as the distance G1 between the coils is larger.

Therefore, by changing at least one of the radial direction distance R and the inter-coil distance G1 in the design stage of the electric toothbrush 40, the magnitude of the electric coupling coefficient can be adjusted in accordance with various design conditions.

The relationship between the load impedance of the secondary coil 43 and the transmission efficiency will be described with reference to Fig. 4. The vertical axis of Fig. 4 shows the transmission efficiency, that is, the ratio of the current supplied to the primary coil 21 to the current generated by the secondary coil 43 by the same current. The horizontal axis of Figure 4 shows the magnitude of the load impedance.

As the load impedance, the rectifier circuit 53, the secondary battery 46, and the electric motor 47 of Fig. 2 are exemplified. When it is assumed that the voltage of the primary coil 21 is fixed, the current supplied to the rectifier circuit 53, the secondary battery 46, and the electric motor 47 becomes smaller as the load impedance increases.

Here, the "coaxial configuration", the "first parallel axis configuration", and the "second parallel axis configuration" are defined as follows, which are defined by the relationship between the secondary coil 43 and the auxiliary coil 44.

(A) The coaxial configuration system is configured such that the secondary coil 43 and the auxiliary coil 44 are coaxially arranged. The coaxial coupling structure is more parallel than the first one. The shaft has a large electrical coupling coefficient.

(B) The first parallel axis configuration is such that the axis JA of the secondary coil 43 and the axis JB of the auxiliary coil 44 are parallel to each other, and the secondary coil 43 is not in contact with the auxiliary coil 44.

(C) The second parallel axis configuration shows that the axis JA of the secondary coil 43 and the axis JB of the auxiliary coil 44 are parallel to each other, and the secondary coil 43 is not in contact with the auxiliary coil 44 and the electric coupling coefficient is smaller than the first parallel axis. Composition.

Each of the curves L1 to L3 in Fig. 4 shows the following relationship.

(A) The curve L1 shows the relationship between the load impedance of the coaxial configuration and the transmission efficiency.

(B) The curve L2 shows the relationship between the load impedance of the first parallel axis and the transmission efficiency.

(C) Curve L3 shows the relationship between the load impedance of the second parallel axis and the transmission efficiency.

The relationship between the load impedance and the transmission efficiency confirmed by the respective curves L1 to L3 is as follows. However, in the following, the maximum transmission efficiency in the arbitrary curve is "maximum transmission efficiency", and the load impedance corresponding to the maximum transmission efficiency is "maximum load impedance".

(A) The maximum load impedance of curve L2 is smaller than the maximum load impedance of curve L1.

(B) The maximum load impedance of curve L3 is smaller than the maximum load impedance of curve L2.

In the electric toothbrush 40, the relationship between the respective curves L1 to L3 is grasped in advance by experiments or the like, and the electric coupling coefficient can be set to obtain a suitable connection to the secondary line. The transmission efficiency of the magnitude of the load impedance of the circle 43. For example, when the load impedance is a fixed size, the transmission efficiency in each of the curves L1 to L3 is selected to be the largest for the magnitude of the load impedance. As a case where the load impedance is a fixed size, the case where the secondary battery 46 is charged is performed at a constant current.

The relationship between the distance between the axes and the transmission efficiency will be described with reference to Fig. 5. The vertical axis of Fig. 5 shows the transmission efficiency. The horizontal axis of Fig. 5 shows the distance between the axes, that is, the distance between the axis JC of the primary coil 21 and the axis JB of the auxiliary coil 44 in the width direction Y of the electric toothbrush 40 of Fig. 3. However, the non-contact power transmission device 10 of Fig. 3 displays a state in which the distance between the axes is "0".

Each of the curves K1 to K3 in Fig. 5 shows the following relationship.

(A) The curve K1 shows the relationship between the distance between the axes of the coaxial configuration and the transmission efficiency.

(B) The curve K2 shows the relationship between the inter-axis distance of the first parallel axis and the transmission efficiency.

(C) The curve K3 shows the relationship between the inter-axis distance of the second parallel axis and the transmission efficiency.

Fig. 5(a) shows the relationship between the inter-axis distance and the transmission efficiency when the distance G2 between the coils is small. Fig. 5(b) shows the relationship between the inter-axis distance and the transmission efficiency when the distance G2 between the coils is large. Fig. 5(c) shows the relationship between the inter-axis distance and the transmission efficiency when the distance G2 between the coils is larger than that of the fifth (b) diagram.

The relationship between the individual inter-axis distances and the transmission efficiency (curves K1 to K3) of the coaxial configuration, the first parallel axis configuration, and the second parallel axis configuration tends to be substantially the same in the distance G2 between the coils.

In the electric toothbrush 40, each curve is grasped in advance by experiments or the like. The relationship between K1 and K3 is used to set the power receiving coupling coefficient to obtain the transmission efficiency suitable for the inter-coil distance G2. For example, when the distance G2 between the coils is a fixed size, the distance between the axis JC of the primary coil 21 and the axis JB of the auxiliary coil 44, which have the highest transmission efficiency among the respective curves K1 to K3, can be selected for the distance between the coils G2. .

The non-contact power transmission device 10 of the second embodiment achieves the following effects in addition to the effects (1) and (3) to (7) achieved by the non-contact power transmission device 10 of the first embodiment.

(8) The non-contact power transmission device 10 has the secondary coil 43 and the auxiliary coil 44 which are formed separately. According to this configuration, the distance between the axis JA of the secondary coil 43 and the axis JB of the auxiliary coil 44 in the width direction Y of the electric toothbrush 40 can be adjusted in the design stage of the non-contact power transmission device 10. Further, the interval between the secondary coil 43 and the auxiliary coil 44 in the axial direction X2 of the electric toothbrush 40 can be adjusted. Therefore, it is possible to select a suitable electric coupling coefficient with a large load impedance or a large inter-axis distance.

The present invention includes embodiments other than the first and second embodiments. Modifications of the respective embodiments of the other embodiments of the present invention are shown below. The following modifications can also be combined with each other.

The secondary coil 43 and the auxiliary coil 44 of the first embodiment (first drawing) are arranged coaxially. On the other hand, the secondary coil 43 and the auxiliary coil 44 of the modified example have mutually parallel axes.

In the second embodiment (Fig. 3), the secondary coil 43 and the auxiliary coil 44 have axes parallel to each other. On the other hand, the secondary coil 43 and the auxiliary coil 44 of the modification have coaxiality.

The secondary coil 43 and the auxiliary coil 44 of the first and second embodiments (first and third figures) are each formed as a cylindrical coil. On the other hand, at least one of the auxiliary coil 44 and the secondary coil 43 of the modified example is formed as a planar coil.

The outer diameter of the auxiliary coil 44 of the first and second embodiments (the first and third figures) is larger than the outer diameter of the secondary coil 43. On the other hand, the outer diameter of the auxiliary coil 44 of the modified example has a size equal to or smaller than the outer diameter of the secondary coil 43.

In the first and second embodiments (the first and third figures), the number of turns of the auxiliary coil 44 is larger than the number of turns of the secondary coil 43. On the other hand, the number of turns of the auxiliary coil 44 in the modified example is equal to or less than the number of turns of the secondary coil 43.

In the first and second embodiments (the first and third figures), the number of turns of the primary coil 21 and the number of turns of the auxiliary coil 44 are equal to each other. On the other hand, the number of turns of the primary coil 21 and the number of turns of the auxiliary coil 44 in the modified example are different from each other. For example, the number of turns of the auxiliary coil 44 is smaller than the number of turns of the primary coil 21, and can be appropriately changed.

The diameter of the wire of the auxiliary coil 44 in the first and second embodiments (the first and third figures) is larger than the diameter of the wire of the secondary coil 43. On the other hand, the diameter of the wire of the auxiliary coil 44 of the modification is equal to or less than the diameter of the wire of the secondary coil 43.

The cores 45 and 60 of the first and second embodiments (the first and third figures) are inserted into the hollow portions of the auxiliary coil 44 and the secondary coil 43, respectively. On the other hand, in the cores 45 and 60 of the modification, the portion corresponding to the auxiliary coil 44 (the first core 61) or the portion corresponding to the secondary coil 43 (the second core 62) is omitted.

Auxiliary coils 44 of the first and second embodiments (first and third figures) The secondary coil 43 has magnetic cores 45 and 60. On the other hand, the auxiliary coil 44 and the secondary coil 43 of the modification omits the cores 45 and 60.

The auxiliary coil 44 and the secondary coil 43 of the first and second embodiments (the first and third figures) have a cylindrical shape. On the other hand, the auxiliary coil 44 and the secondary coil 43 of the modified example have the shape shown in Fig. 6.

(A1) As shown in Fig. 6(a), the auxiliary coil 44 has a quadrangular shape in plan view. The coil 43 of the second time has a circular shape in plan view.

(A2) As shown in Fig. 6(b), the auxiliary coil 44 has a quadrangular shape in plan view. The coils 43 of the second time have a quadrangular shape in plan view.

(A3) As shown in Fig. 6(c), the auxiliary coil 44 has a circular shape in plan view. The coils 43 of the second time have a quadrangular shape in plan view.

The secondary coil 43 and the auxiliary coil 44 which are modifications of the configuration of the above (A1) to (A3) have axes parallel to each other. On the other hand, the auxiliary coil 44 and the secondary coil 43 of the modification of the configuration of the above (A1) to (A3) are coaxially arranged.

The auxiliary coil 44 and the secondary coil 43 in the modification of the configuration of the above (A1) to (A3) have the following shapes.

(B1) The auxiliary coil 44 has any shape of a triangle, a quadrangle, and an ellipse in plan view.

(B2) The secondary coil 43 has any shape of a triangle, a quadrangle, and an ellipse in plan view.

(B3) The auxiliary coil 44 has any of the above (B1) shapes, and the secondary coil 43 has any of the above (B2) shapes.

Electric toothbrush 40 of the first and second embodiments (first and third figures) It has magnetic cores 45 and 60. On the other hand, the electric toothbrush 40 of the modification constitutes any one of the following (C1) to (C4).

(C1) As shown in Fig. 7(a), the auxiliary coil 44 has a pot core 70 instead of the cores 45, 60. The secondary coil 43 is closer to the primary coil in the axial direction X2 than the auxiliary coil 44. 21 configuration. The secondary coil 43 has a circular planar coil shape.

As shown in Fig. 7(b), the can core 70 has a circular bottom wall 71 that supports the auxiliary coil 44 in the axial direction Y of the electric toothbrush 40, an inner wall 72 that is inserted into the hollow portion of the auxiliary coil 44, and The bottom wall 71 of the electric toothbrush 40 extends in the axial direction X2 and covers the outer wall 73 of the auxiliary coil 44.

With this configuration, since the can core 70 has the bottom wall 71 and the outer wall 73, the leakage amount of the magnetic flux between the primary coil 21 and the auxiliary coil 44 is reduced as compared with the case where the auxiliary coil 44 has the cores 45 and 60. .

The auxiliary coil 44 which is a modification of (C2) has an EER core 80 shown in Fig. 8 instead of the can core 70. The EER core 80 has a rectangular bottom wall 81 on which the auxiliary coil 44 of Fig. 7(a) is mounted and extends in the width direction Y of the electric toothbrush 40, a cylindrical inner wall 82 into which the hollow portion of the auxiliary coil 44 is inserted, and a bottom portion. Both ends of the wall 81 extend in the axial direction X2 and extend opposite to the auxiliary coil 44 to the outer wall 83. Each outer wall 83 has an inner surface of an arc shape.

According to this configuration, since the EER core 80 has the bottom wall 81 and the outer wall 83, the amount of leakage of the magnetic flux between the primary coil 21 and the auxiliary coil 44 is reduced as compared with the case where the auxiliary coil 44 has the cores 45 and 60.

(C3) As shown in Fig. 9(a), the auxiliary coil 44 has EER magnet The cores 80 are replaced by the cores 45 and 60. The secondary coils 43 are located closer to the primary coil 21 side than the auxiliary coils 44 in the axial direction X2 of the electric toothbrush 40. One of the secondary coils 43 is inserted into the EE core 90.

As shown in Fig. 9(b), the EE core 90 includes a rectangular bottom wall 91 on which the auxiliary coil 44 is mounted and extends along the width direction Y of the electric toothbrush 40, and a rectangular inner wall 92 into which the hollow portion of the auxiliary coil 44 is inserted. And an outer wall 93 of a rectangle extending from the both ends of the bottom wall 91 in the axial direction X2 and extending opposite to the auxiliary coil 44.

With this configuration, since the EE core 90 has the bottom wall 91 and the outer wall 93, the amount of leakage of the magnetic flux between the primary coil 21 and the auxiliary coil 44 is reduced as compared with the case where the auxiliary coil 44 has the cores 45 and 60. Further, since the secondary coil 43 is inserted into the outer wall 93 of the EE core 90, the amount of leakage of the magnetic flux between the auxiliary coil 44 and the secondary coil 43 is reduced as compared with the case where the secondary coil 43 is not inserted into the outer wall 93.

(C4) As shown in Fig. 10, the secondary coil 43 has a magnetic sheet 100 instead of the cores 45, 60. The auxiliary coil 44 is disposed adjacent to the primary coil 21 in the axial direction X2 of the electric toothbrush 40 as compared with the secondary coil 43. The outer diameter of the auxiliary coil 44 is larger than the outer diameter of the secondary coil 43.

The auxiliary coil 44 and the secondary coil 43 in the modification of the configuration of the above (C1) to (C4) are coaxially arranged.

In the modification of the configuration of the above (C4), the end portion of the auxiliary coil 44 is not in contact with the end portion of the secondary coil 43.

The auxiliary coil 44 and the secondary coil 43 of the first and second embodiments (first and third figures) have magnetic cores 45 and 60. On the other hand, the auxiliary of the modification The coil 44 and the secondary coil 43 have the core 110 shown in Fig. 11.

The core 110 includes a first core 111 into which a hollow portion of the auxiliary coil 44 is inserted, and a second core 112 in which a hollow portion of the secondary coil 43 is inserted. The first core 111 and the second core 112 are formed separately. The second core 112 is fixed to the end surface of the first core 111 in the axial direction X2 of the electric toothbrush 40. As the material of the first core 111 and the second core 112, a magnetic material can be used. The magnetic permeability of the second core 112 is smaller than the magnetic permeability of the first core 111.

In the non-contact power transmission device 10 having the core 110, the Q value of the auxiliary coil 44 can be increased by increasing the magnetic permeability of the first core 111. Further, in the case where the Q value of the auxiliary coil 44 is increased, since it is not necessary to increase the Q value of the secondary coil 43, the second core 112 having a low magnetic permeability can be used. When the second core 112 having a low magnetic permeability is used, the cost of the coil is reduced.

As described above, in the non-contact power transmission device 10, since the first core 111 and the second core 112 are separately formed, the cores suitable for the auxiliary coil 44 and the secondary coil 43 can be selected from the viewpoint of Q value and cost.

The power transmission device 20 of the first and second embodiments (first and third figures) includes a primary coil 21 having a circular shape in plan view. On the other hand, the power transmission device 20 according to the modification has a non-vortex primary coil 121 shown in Fig. 12(a) instead of the primary coil 21 having a circular shape in plan view.

As shown in Fig. 12(a), the primary coil 121 is formed as a planar coil having a non-vortex wiring pattern in plan view. The primary coil 121 includes a plurality of linear portions 121A parallel to each other, and a plurality of connecting portions 121B connecting the ends of the adjacent straight portions 121A. Each of the connecting portions 121B is orthogonal to the straight portion 121A in plan view. And the adjacent group is straight In the line portion 121A, the straight line portion 121A corresponds to the "first linear portion" and the other straight portion 121A corresponds to the "second linear portion".

The non-vibrating wiring form includes a wiring form other than a planar coil having a spiral shape in plan view. The vortex shape is formed by a plurality of annular portions formed by the wires. The annular portion has a circular shape or a similar shape, and a polygonal shape or a shape similar thereto.

As shown in Fig. 12(b), when a current is supplied to the primary coil 121, the flow of the current of the straight line portion 121A in the adjacent one straight portion 121A is opposite to the flow of the current from the other straight portion 121A. Therefore, the magnetic fluxes generated in the respective straight line portions 121A between the adjacent straight line portions 121A are mutually enhanced.

The non-contact power transmission device according to the embodiment of Fig. 12 of the present invention can achieve the following effects.

(1) The planar coil having a circular shape in plan view has a form of a laminated wire in the diameter direction. Therefore, when the coil is manufactured by a winding machine or a manual operation, it is required to work while maintaining the shape of the curved portion to be adjacent in the diameter direction. The contact state of the wires is uniform throughout the entire wire.

On the other hand, the primary coil 121 of the non-contact power transmission device 10 has a planar wiring pattern that is non-vortex in plan view, and is formed by a plurality of linear portions 121A and a plurality of connecting portions 121B. That is, it is different from the aforementioned planar coil having a circular shape without a spiral shape.

Therefore, in the manufacture of the primary coil 121, it is not necessary to perform the work while maintaining the shape of the curved portion so that the contact state of the wires adjacent in the diameter direction is uniform to the entire wire. That is, with the foregoing having a round shape In comparison with the planar coil, the accuracy required for the operation at the time of manufacture is lowered, so that the time during manufacture can be reduced.

Further, since a gap is formed between the adjacent ones of the straight portions 121A in the coil 121, the tolerance of the wiring position of the straight portion 121A and the tolerance to the angle of the wiring direction can be increased. On the other hand, since the above-mentioned planar coil having a circular shape is in contact with each other in the diametrical direction, the tolerance of the wiring position of the conductor or the like must be smaller than the tolerance of the linear portion 121A of the primary coil 121. Moreover, by comparing the points, the primary coil 121 can reduce the time required for manufacturing than the circular coil having the circular shape described above.

(2) The primary coil 121 of the non-contact power transmission device 10 has a linear portion 121A that is flat with each other, and a connecting portion 121B that connects the ends of the adjacent straight portions 121A to each other. With this configuration, when the primary coil 121 is supplied with electric power, the currents of the adjacent straight portions 121A flow in opposite directions, and thus the magnetic forces between the adjacent straight portions 121A reinforce each other. Therefore, the power transmission efficiency from the primary coil 121 to the auxiliary coil 144 is improved.

One example of the primary coil 121 as a non-vortex wiring pattern is formed by a plurality of linear portions 121A and a plurality of connecting portions 121B. On the other hand, the primary coil system of the modified example has any one of the following (D1), (D2), (E1) to (E3), (F1) to (F3), and (G1) to (G3).

(D1) As shown in Fig. 13(a), the primary coil 121 has a plurality of linear portions 121A which are parallel to each other. The electric power is supplied from the power source of the power transmitting device 20 individually in the straight line portion 121A.

(D2) The primary coil of the modification of the form of the above (D1) In 121, the other straight line portion 121A is omitted and one of the plurality of straight line portions 121A is left. Power is supplied from the power source of the power transmitting device 20 at one straight line portion 121A.

(E1) As shown in Fig. 13(b), the primary coil 124 has a plurality of undulating portions 124A which are parallel to each other, and a plurality of connecting portions 124B which connect the adjacent wavy portions 124A to each other. However, in the adjacent wavy portion 124A, one wavy portion 124A corresponds to the "first linear portion", and the other wavy portion 124A corresponds to the "second linear portion".

(E2) The primary coil 124 which is a modification of the form of the above (E1) has a plurality of undulating portions 124A with a plurality of connecting portions 124B omitted. The electric power from the power source of the power transmitting device 20 is individually supplied to the undulating portion 124A.

(E3) In the primary coil 124 which is a modification of the form of the above (E2), the other wavy portion 124A is omitted, and one of the plurality of wavy portions 124A is left. Power is supplied from a power source of the power transmitting device 20 to a wavy portion 124A.

(F1) As shown in Fig. 13(c), the primary coil 125 has a plurality of bellows-like portions 125A which are parallel to each other, and a plurality of connecting portions 125B which connect the adjacent bellows-like portions 125A to each other. Further, in the adjacent group of bellows portions 125A, one of the bellows portions 125A corresponds to the "first linear portion", and the other bellows portion 125A corresponds to the "second linear portion". "."

(F2) The primary coil 125 which is a modification of the form of the above (F1) has a plurality of bellows-like portions, and the plurality of connecting portions 125B are omitted. 125A. The plurality of bellows portions 125A are individually supplied with electric power from the power source of the power transmitting device 20.

(F3) In the primary coil 125 according to the modification of the above aspect (F2), the other bellows-shaped portion 125A is omitted, and one of the plurality of bellows-shaped portions 125A is left. Power is supplied from a power source of the power transmitting device 20 to a bellows portion 125A.

(G1) As shown in Fig. 13(d), the primary coil 126 has a plurality of circular arc portions 126A that are parallel to each other, and a plurality of connecting portions 126B that connect the adjacent circular arc portions 126A to each other. However, among the adjacent arc portions 126A, one of the arc portions 126A corresponds to the "first linear portion", and the other arc portion 126A corresponds to the "second linear portion".

(G2) The primary coil 126 which is a modification of the form of the above (G1) has a plurality of arc portions 126A with a plurality of connecting portions 126B omitted. The plurality of arc portions 126A are individually supplied with electric power from the power source of the power transmitting device 20.

(G3) In the primary coil 126 which is a modification of the form of the above (G2), the other arc portion 126A is omitted, and one of the plurality of arc portions 126A is left. The arc portion 126A is supplied with electric power from the power source of the power transmitting device 20.

The modification of the form of the above (D1), (E2), (F2), and (G2) is for a linear portion of one adjacent group, that is, for a pair of adjacent straight portions 121A and adjacent ones. The wavy portion 124A, the adjacent one of the bellows portions 125A, and the adjacent one of the arc portions 126A supply a current opposite to each other in one of the linear portions and the other linear portion. Thereby, the first and second implementations The effect of reinforcing the magnetic flux between the linear portions of one set can be obtained by the same straight line portion 121A adjacent to the form.

The primary coil 12 of the modification of the form of the above (D1), (D2), (E1) to (E3), (F1) to (F3), and (G1) to (G3) may have a power transmission device 20 The portion of the axis X1 that is bent.

The electric toothbrush 40 of the first and second embodiments (first and third figures) has a secondary battery 46. On the other hand, in the electric toothbrush 40 of the modification, the secondary battery 46 is omitted. The secondary coil 43 of the electric toothbrush 40 directly supplies current to the electric motor 47. Further, the power transmitting device 20 transmits electric power to the electric toothbrush 40 when the electric motor 47 is driven.

The present invention is also applicable to other power receiving devices other than the electric toothbrush 40 exemplified in the first and second embodiments (the first and third figures). As other power receiving devices, an electric razor, a nose hair clipper, or a hair dryer can be exemplified. This power receiving device has a configuration conforming to the first and second embodiments. Alternatively, the effects of the effects of the first and second embodiments can be achieved.

The configuration of the non-contact power transmission device 10 of the third embodiment will be described with reference to Fig. 14.

The non-contact power transmission device 210 includes a wash table 220 having a primary coil 230 and an electric toothbrush 260 having a secondary coil 43. The primary coil 230 of the washstand 220 transmits electric power to the secondary battery 46 of the electric toothbrush 260 by electromagnetic induction. However, the washstand 220 corresponds to a "power transmission device". Moreover, the electric toothbrush 260 corresponds to a "power receiving device".

The washstand 220 includes a mirror 221 and a lighting fixture 226 constituting a portion above the washstand 220, and a washstand constituting a lower portion of the washstand 220 222. The mirror 221 has a left mirror 221A and a right mirror 221B. The washstand 222 includes a water tank 223, a mounting table 224 on which the electric toothbrush 260 can be placed, and a support table 225 that supports the mirror 221 . The lighting fixture 226 is located on the upper side of the mirror 221.

The left mirror 221A includes a primary coil 230 and a magnetic sheet 234 which are provided inside. The right mirror 221B includes a first relay coil 231 provided inside. The water tank 223 includes a second relay coil 232 provided inside. The mounting table 224 includes a third relay coil 233 provided inside.

The primary coil 230 is formed as a planar coil having a quadrangular shape in plan view. The first relay coil 231 is formed as a planar coil having a square shape in plan view. The second relay coil 232 is formed along the surface of the water tank 223 and the support base 225 with respect to the water tank 223 and the support base 225. The third relay coil 233 is formed along the surface of the mounting table 224 and the support table 225, and the support table 224 and the support table 225.

The wires of the primary coil 230, the first relay coil 231, the second relay coil 232, and the third relay coil 233 have the same outer diameter. The length of each side of the magnetic piece 234 is larger than the length of each side of the primary coil 230. Each of the relay coils 231 to 233 has the same number of turns. The number of turns of each of the relay coils 231 to 233 is larger than the number of turns of the primary coil 230. However, in Fig. 14, the number of turns of the primary coil 230 and each of the relay coils 231 to 233 is made smaller than the actual number of turns, and the shape of the primary coil 230 and the respective relay coils 231 to 233 is simplified. Further, the map of the coils shown in the drawings of Fig. 15 and subsequent figures is also displayed in the same manner as in Fig. 14 by reducing the number of turns.

The second relay coil 232 is bent at a connection portion with the water tank 223 and the support table 225. Therefore, the orientation of the magnetic flux generated in the portion of the second relay coil 232 corresponding to the water tank 223 and the second relay coil are generated. The orientations of the magnetic fluxes of the portions corresponding to the support table 225 in 232 are different from each other.

The third relay coil 233 is bent at a connection portion with the mounting table and the support table 225. Therefore, the direction of the magnetic flux generated in the portion corresponding to the mounting table 224 in the third relay coil 233 and the direction of the magnetic flux generated in the portion corresponding to the support table 225 in the third relay coil 233 are different from each other.

Fig. 14 shows an electric toothbrush 260 placed on a mounting table 224 having a third relay coil 233. In the electric toothbrush 260, the same components as those of the electric toothbrush 40 of the first and second embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

The relationship between the coils 230, 233, 43, and 44 will be described with reference to Figs. 14 and 15.

(A) The diameter of the wire of the primary coil 230 or the relay coil 233 is larger than the diameter of the wire of the secondary coil 43.

(B) The diameter of the wire of the primary coil 230 or the relay coil 233 is larger than the diameter of the wire of the auxiliary coil 44.

(C) The number of turns of the primary coil 230 or the relay coil 233 is larger than the number of turns of the secondary coil 43.

(D) The number of turns of the primary coil 230 or the relay coil 233 is equal to the number of turns of the auxiliary coil 44.

The Q value of the auxiliary coil 44 is larger than the Q value of the secondary coil 43 because each of the coils 230, 233, 43, and 44 has the above relationship (A) to (D).

The circuit configuration of the non-contact power transmission device 210 will be described with reference to Fig. 16.

The washstand 220 includes a primary circuit 240 that can control the power supplied to the primary coil 230, and a relay circuit 250 that relays the magnetic flux of the primary coil 230 to the secondary coil 44. The electric toothbrush 260 has a secondary circuit 270 that can control the power transmitted by the primary circuit 240.

The primary circuit 240 includes a transmission circuit 241 that can supply an alternating current to the primary coil 230, a power transmission control unit 242 that can control the transmission circuit 241, a primary coil 230 that is connected to the transmission circuit 241, and a serial connection with the primary coil 230. Capacitor 243. The circuit 240 of the first time has a primary antenna 245 for receiving and transmitting signals between the secondary circuit 270 and the secondary circuit 270. The transmission circuit 241 has a plurality of transistors connected to the primary coil 230. The primary coil 230 and the capacitor 243 constitute a resonant circuit 244.

The power transmission control unit 242 transmits the voltage signal (hereinafter referred to as "response request signal") that is required to respond to the transmission destination of the electric toothbrush 260 or the like through the primary antenna 245 in a predetermined cycle. The response request signal is generated by the alternating current supplied to the primary coil 230.

The relay circuit 250 includes a first relay circuit 251 having a first relay coil 231 and a capacitor 254, a second relay circuit 252 having a second relay coil 232 and a capacitor 255, and a third relay coil. 233 and the third relay circuit 253 of the capacitor 256.

The first relay circuit 251 includes a resonant circuit formed by a capacitor 254 and a first relay coil 231 that are connected in series to the first relay coil 231. The second relay circuit 252 includes a resonant circuit formed by a capacitor 225 and a second relay coil 232 that are connected in series to the second relay coil 232. The third relay circuit 253 includes a capacitor 256 and a third capacitor 233 connected in series A resonant circuit formed by the third relay coil 233. The capacitance of each of the capacitors 254 to 256 is set such that the resonance frequencies of the respective relay circuits 251 to 253 coincide with the reference frequency FK.

The first relay circuit 251, the second relay circuit 252, and the third relay circuit 253 have a relationship of non-electrical contact with each other and a non-electrical contact with the primary circuit 240 and the secondary circuit 270. . Therefore, compared with at least one of the above-described respective relationships, the impedance of each of the relay coils 231 to 233 is small.

The secondary circuit 270 includes a power supply control unit 274 that can control the direct current supplied to the secondary battery 46, and a secondary antenna 275 that transmits and receives signals to and from the primary circuit 240.

The rectifier circuit is electrically connected to the secondary coil 43 and the power supply control unit 274.

The secondary side resonance circuit 51 has a relationship of non-electrical contact with the rectifier circuit 53 and the power supply control unit 274. Therefore, the impedance of the auxiliary coil 44 becomes smaller as compared with the configuration having the same relationship.

The power supply control unit 274 includes a DC-DC converter (not shown) and a transistor (not shown) that controls the voltage of the DC power rectified by the rectifier circuit 53 to form an electric crystal system. The supply of DC power to the secondary battery 46 and the blocker are switched. The power supply control unit 274 and the secondary battery 46 are electrically connected to each other.

The power supply control unit 274 performs voltage control for changing the voltage of the direct current to the DC-DC converter in accordance with the state of charge of the secondary battery 46, and performs the charging of the secondary battery 46 in accordance with the amount of power supplied to the secondary battery 46. The power supply control that changes the state.

The power supply control unit 274 maintains the transistor in an ON state when the charging of the secondary battery 46 is not completed yet, that is, maintains a state in which the secondary battery 46 is supplied with DC power. On the other hand, when the secondary battery 46 is fully charged, the transistor is maintained in an off state.

When receiving the response request signal from the power transmission control unit 242 through the secondary antenna 275, the power supply control unit 274 transmits a voltage signal (hereinafter referred to as "response confirmation signal") indicating that the response signal is received to the power transmission control unit 242. . When receiving the response confirmation signal through the antenna 245, the power transmission control unit 242 determines that the electric toothbrush 260 is mounted on the mounting table 224 of the washstand 220. The charging of the secondary battery 46 by the secondary circuit 240 is then started.

The power transmission mode of the non-contact power transmission device 210 will be described with reference to Fig. 16. The transmission mode of the response request signal from the primary coil 230 to the secondary coil 43 is the same as the power transmission mode described below, and thus the description thereof will be omitted.

(A) The power transmission control unit 242 of the wash station 220 supplies the alternating current of the reference frequency FK to the primary coil 230 by the control transmission circuit 241.

(B) The primary coil 230 generates an alternating magnetic flux by supplying alternating current.

(C) The first relay coil 231 and the second relay coil 232 generate an alternating current and an alternating current flux of the reference frequency FK by interlinking with the alternating magnetic flux of the primary coil 230.

(D) The third relay coil 233 generates an exchange of the reference frequency FK by the AC flux interconnection with the first relay coil 231, that is, the second relay coil 232. Electrical and AC flux. On the other hand, the AC magnetic flux of the third relay coil 233 is higher than the Q value of the auxiliary coil 44 by the secondary coil 263, and is not interlocked with the secondary coil 43.

(E) The auxiliary coil 44 generates an alternating current and an alternating magnetic flux of the reference frequency FK by interlinking the alternating magnetic flux with the third relay coil 233. The alternating current and the alternating magnetic flux generated in the auxiliary coil 44 are electrically connected to the secondary winding circuit 51 and the secondary side resonant circuit 51, and the alternating current and the alternating magnetic flux generated in the auxiliary coil 44 are large.

(F) The secondary coil 43 generates an alternating current by interlinking the alternating magnetic flux with the auxiliary coil 44.

(G) The rectifier circuit 53 converts the alternating current of the secondary coil 43 into direct current.

(H) The power supply control unit 274 supplies the DC power of the rectifier circuit 53 to the secondary battery 46.

The non-contact power transmission device 210 according to the third embodiment of the present invention can achieve the following effects.

(1) The washstand 10 of the non-contact power transmission device 210 has the respective relay coils 231 to 233. According to this configuration, since the relay coils 231 to 233 relay the flow of the magnetic flux from the primary coil 230 to the auxiliary coil 44, the transmission distance becomes smaller as compared with the configuration in which the primary coil 230 directly intersects the auxiliary coil 44. Big.

(2) The wash basin 220 of the non-contact power transmission device 210 has a plurality of relay coils, that is, a first relay coil 231, a second relay coil 232, and a third relay coil 233. According to this configuration, with 1 or 2 trunks Compared with the composition of the circle, the transmission distance will become larger. Further, in comparison with the same configuration, the range in which the magnetic flux of the primary coil 230 to the auxiliary coil 44 is relayed is increased. Therefore, in a position other than the mounting table 224, for example, when the electric toothbrush 260 is disposed in the outer peripheral portion of the water tank 223, electric power can be transmitted from the washing table 220 to the electric toothbrush 260.

(3) Each of the relay coils 231 to 233 of the non-contact power transmission device 210 is not connected to an electrical load. According to this configuration, in comparison with the configuration in which the relay coils 231 to 233 are connected to the electrical load, the current generated in each of the relay coils 231 to 233 can be increased by the interconnection with the magnetic flux of the primary coil 230. Therefore, the transmission distance can be increased as compared with the configuration of the aforementioned comparison object.

In the non-contact power transmission device 210 of the third embodiment, the electric toothbrush 40 of the second embodiment including the auxiliary coil 44 and the secondary coil 43 having mutually parallel axes may be used.

The non-contact power transmission device 210 of the fourth embodiment shown in the seventeenth and eighteenth embodiments is mainly different from the non-contact power transmission device 210 of the first embodiment shown in FIG. . In other words, the washstand 220 of the first embodiment has the primary coil 230 in the left mirror 211A, and the relay coils 231 to 233 in the right mirror 221B, the water tank 223, and the mounting table 224. Further, the power receiving device has an electric toothbrush 260. On the other hand, the wash basin 220 of the fourth embodiment has a primary coil 230 on the mounting table 224. Further, the electric toothbrush 260, which is a power receiving device in place of the third embodiment, has an electric shaver 390. In the following, the details of the difference from the non-contact power transmission device 210 of the third embodiment will be described, and the same components as those of the embodiment will be denoted by the same reference numerals, and a part or all of the description will be omitted.

As shown in Fig. 17, the non-contact power transmission device 210 has an electric razor 390 and a washing machine 391. The wash table 222 has a mounting table 224 on which the water tank 223, the washing machine 391, and the like can be placed, and a support table 225 that supports the mirror 221 .

In the washstand 220, the washstand 220 of the third embodiment is omitted to each of the relay coils 231 to 233 (each of the relay circuits 251 to 253). Further, the left mirror 211A to the primary coil 230 and the magnetic sheet 234 are omitted. The mounting table 224 has a primary coil 230 and a magnetic piece 234. The mounting table 224 of the washstand 220 corresponds to a "power transmission device".

As shown in Fig. 18, the washing machine 391 has a relay coil 392 provided inside. The relay coil 392 is formed into a planar coil having a circular shape in plan view. The outer diameter of the relay coil 392 is smaller than the size of each side of the primary coil 230. The relay coil 392 is connected in series to a capacitor (not shown). The relay coil 392 and the capacitor constitute a resonance circuit. The capacitance of the capacitor is set such that the resonant frequency of the resonant circuit coincides with the reference frequency FK. The outer diameter of the relay coil 392 corresponds to the "outer diameter of the coil of the relay coil". Further, the size of each side of the primary coil 230 corresponds to the "outer diameter of the primary coil".

Similarly to the electric toothbrush 260 of the third embodiment, the electric razor 390 includes an auxiliary coil 44, a secondary coil 43, a magnetic core 45, a secondary circuit 270, and a secondary battery 46. The auxiliary coil 44, the secondary coil 43, the core 45, the secondary circuit 270, and the secondary battery 46 are located inside the electric shaver 390.

The power transmission configuration of the non-contact power transmission device 210 will be described with reference to FIGS. 16 and 18. The supply form of electric power from the secondary coil 43 of the electric razor 390 to the secondary battery 46 is the same as that of the third embodiment. The states are the same and the description thereof is omitted.

(A) The power transmission control unit 242 of the wash station 220 supplies the alternating current of the reference frequency FK to the primary coil 230 by the control transmission circuit 241.

(B) The primary coil 230 generates an alternating magnetic flux by supplying alternating current.

(C) The relay coil 392 of the electric razor 390 generates an alternating current and an alternating magnetic flux of the reference frequency FK by interlinking the magnetic flux with the primary coil 230.

(D) The auxiliary coil 44 of the electric razor 390 generates an alternating current and an alternating magnetic flux of the reference frequency FK by interlinking the alternating magnetic flux with the relay coil 392.

The non-contact power transmission device 210 of the fourth embodiment achieves the following effects in addition to the effects (1) to (3) achieved by the non-contact power transmission device 10 of the third embodiment.

(4) The outer diameter of the relay coil 392 of the non-contact power transmission device 210 is smaller than the size of each side of the primary coil 230. Further, the relay coil 392 has a circular shape. Again, the coil 230 has a quadrangular shape. According to this configuration, by making the outer circumference of the relay coil 392 within the range surrounded by the outer circumference of the primary coil 230, the power transmission between the primary coil 230 and the secondary coil 43 can be performed more efficiently. Therefore, compared with the configuration in which the outer diameter of the relay coil 392 is the same as the size of each side of the primary coil 230, the positional positioning of the relay coil 392 with respect to the primary coil 230 is more easily performed, that is, the cleaner 391 is opposed to 1 The position of the secondary coil 230 is positioned.

Non-contact type of the fifth embodiment shown in Fig. 19 and Fig. 20 The power transmission device 210 has the following main differences from the non-contact power transmission device 210 of the fourth embodiment shown in FIG. That is, the non-contact power transmission device 210 of the fourth embodiment includes an electric razor 390 and a cleaner 391. On the other hand, the power receiving device according to the fifth embodiment includes an electric toothbrush 260 and a cosmetic bag 400. The details of the differences from the non-contact power transmission device 210 of the fourth embodiment will be described below, and the same components as those of the embodiment will be denoted by the same reference numerals, and a part or all of the description will be omitted.

The constitution of the cosmetic bag 400 will be described with reference to Fig. 19.

The cosmetic bag 400 includes a housing 401 that constitutes the main body, a relay coil 402 that interconnects the magnetic flux of the primary coil 230, and a capacitor (not shown) that is connected in series to the relay coil 402. The housing 401 has a relay coil 402 at a peripheral portion of the front field of view.

The relay coil 402 is formed in a planar coil having a quadrangular shape in the front view of the casing 401. The size of each side of the relay coil 402 is smaller than the size of each side of the primary coil 230 of Fig. 17. The size of each side of the relay coil 402 corresponds to the "outer diameter of the coil of the relay coil".

The relay coil 402 and the capacitor form a resonant circuit. The resonant circuit is not connected to other electrical loads such as the electric toothbrush 260. The capacitance of the capacitor is set such that the resonant frequency of the resonant circuit coincides with the reference frequency FK.

The relationship between the coils 402, 44, and 43 will be described with reference to Fig. 20.

The auxiliary coil 44 of the electric toothbrush 260 is located in the state of the electric toothbrush 260 in the housing 401, and is located closer to the center of the relay coil 402. The position of the outer peripheral portion of the coil 402.

The power transmission configuration of the non-contact power transmission device 210 will be described with reference to Figs. 16 and 20. The electric power supply form from the secondary coil 43 to the secondary battery 46 of the electric toothbrush 260 is the same as that of the third embodiment, and thus the description thereof will be omitted.

(A) The power transmission control unit 242 of the wash station 220 supplies the alternating current of the reference frequency FK to the primary coil 230 by the control transmission circuit 241.

(B) The primary coil 230 generates an alternating magnetic flux by supplying alternating current.

(C) The relay coil 402 of the cosmetic bag 400 generates an alternating current and an alternating magnetic flux of the reference frequency FK by interlinking with the alternating magnetic flux of the primary coil 230.

(D) The auxiliary coil 44 of the electric toothbrush 260 generates an alternating current and an alternating magnetic flux of the reference frequency FK by interlinking the alternating magnetic flux with the relay coil 402.

The non-contact power transmission device 210 of the fifth embodiment can achieve the effects (1) to (3) achieved by the non-contact power transmission device 210 of the third embodiment and the non-contact power of the fourth embodiment. The transfer device 210 can achieve the same effect as the (4) effect.

The non-contact power transmission device 210 of the sixth embodiment shown in FIG. 21 differs from the non-contact power transmission device 210 of the third embodiment shown in FIG. 14 in the following points. That is, the washstand 220 of the third embodiment has a primary coil 230. On the other hand, the washstand 220 of the sixth embodiment has a plurality of primary coils 230. Take The details of the differences from the non-contact power transmission device 210 of the third embodiment will be described below, and the same components as those of the embodiment will be denoted by the same reference numerals, and a part or all of the description will be omitted.

The configuration of the washstand 220 in which the door is in the closed state will be described with reference to Fig. 21(a).

The washstand 220 includes a cabinet 510 that can accommodate a washing appliance or the like, a central door 511 that can open and close the central portion of the cabinet 510, a left door 512 that can open and close the left portion of the cabinet 510, and a right door that opens and closes the right portion of the cabinet 510. 513. The cabinet 510, the left door 512, and the right door are equivalent to the "power transmission device".

Referring to Fig. 21(b), the configuration of the washstand 220 in which the door is in the open state will be described. In the 21st (b) figure, the center door 511 which opened the center part of the cabinet 510 is abbreviate|omitted.

The cabinet 510 includes a central switch 514 that can detect the open and closed state of the central door 511, a left switch 515 that can detect the open and closed state of the left door 512, a right switch 516 that can detect the open and closed state of the right door 513, and switchable to each coil 521. ~523 power supply state power switch 517.

The cabinet 510 has a first coil 521 as a primary coil 230, a first capacitor (not shown), and a first relay coil 531 and a fourth capacitor (not shown). The first coil 521 and the first capacitor are located in the outer peripheral portion of the cabinet 510. The first relay coil 531 and the fourth capacitor are located in the upper left portion of the cabinet 510.

The first capacitor is connected in series to the first coil 521. The first coil 521 and the first capacitor constitute a first resonant circuit. The fourth capacitor is in the first The coils 531 are connected in series. The first relay coil 531 and the fourth capacitor constitute a fourth resonance circuit.

The left door 512 includes a second coil 522 as a primary coil 230, a second capacitor (not shown), a second relay coil 532, and a fifth capacitor (not shown). The second capacitor is connected in series to the second coil 522. The second coil 522 and the second capacitor constitute a second resonance circuit. The fifth capacitor is connected in series to the second relay coil 532. The second relay coil 532 and the fifth capacitor constitute a fifth resonance circuit.

The right door 513 includes a third coil 523 as a primary coil 230, a third capacitor (not shown), a third relay coil 533, and a sixth capacitor (not shown). The third capacitor is connected in series to the third coil 523. The third coil 523 and the third capacitor constitute a third resonance circuit. The sixth capacitor is connected in series to the third relay coil 533. The third relay coil 533 and the sixth capacitor constitute a sixth resonance circuit.

Each of the coils 521 to 523 is formed as a planar coil having a square shape in plan view. Similarly, each of the relay coils 531 to 533 is formed as a planar coil having a square shape in plan view.

Each of the coils 521 to 523 corresponds to either "primary coil CA" or "primary coil CB". In other words, when the first coil 521 corresponds to the "primary coil CA", one of the second coil 522 and the third coil 523 corresponds to the "primary coil CB". When the second coil 522 corresponds to the "primary coil CA", one of the first coil 521 and the third coil 523 corresponds to the "primary coil CB". When the third coil 523 corresponds to the "primary coil CA", one of the first coil 521 and the second coil 522 corresponds to the "primary coil CB". this In this case, the positional relationship between the primary coil CA and the primary coil CB can also be changed.

The operation of each of the switches 514 to 517 will be described.

The center switch 514 is turned on when the center door 511 is closed and is in contact with the center door 511, and is turned off when the center door 511 is opened and is separated from the center door 511.

The left switch 515 is turned on when the left door 512 is closed and is in contact with the left door 512, and is turned off when the left door 512 is opened to be separated from the left door 512.

The right switch 516 is turned on when the right door 513 is closed and is in contact with the right door 513, and is turned off when the right door 513 is opened to be separated from the right door 513.

The central switch 514, the left switch 515, and the right switch 516 transmit signals to the power transmission control unit 242 of FIG. 3 in response to individual turn-on or turn-off signals. The power transmission control unit 242 detects the on-off state of each of the doors 511 to 513 based on the signals received by the switches 514 to 516.

The power switch 517 transmits the pilot communication number indicating the ON state of the power switch 517 to the power transmission control unit 242 when the operation is turned on by the user. On the other hand, when the user's operation is turned off, the cutoff signal indicating the off state of the power switch 517 is transmitted to the power transmission control portion 242. The power transmission control unit 242 controls the energization state to the coils 521 to 523 based on the pilot communication number or the cutoff signal received from the power switch 517.

The relationship between the coils 521 to 523 will be described.

(A) The size of each side of the second coil 522 is smaller than that of the first coil 521.

(B) The size of each side of the third coil 523 is smaller than that of the first coil 521.

(C) The dimensions of the respective sides of the second coil 522 and the third coil 523 are equal to each other.

(D) The diameters of the wires of the respective coils 521 to 523 are equal to each other.

The relationship between each of the relay coils 531 to 533 will be described.

(A) The sizes of the sides of the respective relay coils 531 to 533 are equal to each other.

(B) The diameters of the wires of the respective relay coils 531 to 533 are equal to each other.

(C) The size of each side of each of the relay coils 531 to 533 is smaller than that of each of the coils 121 to 123.

The circuit configuration of the non-contact power transmission device 210 will be described.

The first resonant circuit of the cabinet 510, the second resonant circuit of the left door 512, and the third resonant circuit of the right door 513 are connected in parallel with each other. The capacitance of the capacitor of each resonant circuit is set such that the resonant frequency of each resonant circuit coincides with the reference frequency FK.

The fourth resonant circuit of the cabinet 510, the fifth resonant circuit of the left door 512, and the sixth resonant circuit of the right door 513 are electrically connected to each other. Further, each resonant circuit is not electrically connected to other electrical loads such as the electric toothbrush 260. The capacitance of the capacitor of each resonant circuit is set such that the resonant frequency of each resonant circuit coincides with the reference frequency FK.

The positional relationship of each of the coils 521 to 523 will be described.

The position of the second coil 522 with respect to the first coil 521 changes depending on the position of the left door 512 with respect to the cabinet 510, that is, the opening degree of the left door 512 with respect to the cabinet 510 (hereinafter referred to as "left door opening degree").

When the left door 512 is in the closed state, that is, the left door opening degree is When "0", the distance between the first coil 521 and the second coil 522 is the smallest. On the other hand, when the left door 512 is in the open state, that is, when the left door opening degree is larger than "0", the distance between the first coil 521 and the second coil 522 becomes longer as the left door opening degree increases.

The position of the third coil 523 with respect to the first coil 521 changes depending on the position of the right door 513 with respect to the cabinet 510, that is, the opening degree of the right door 513 with respect to the cabinet 510 (hereinafter referred to as "right door opening degree").

When the right door 513 is in the closed state, that is, when the right door opening degree is "0", the distance between the first coil 521 and the third coil 523 is the smallest. On the other hand, when the right door 513 is in the open state, that is, when the right door opening degree is larger than "0", the distance between the first coil 521 and the third coil 523 becomes longer as the right door opening degree increases.

The power transmission configuration of the non-contact power transmission device 210 will be described with reference to Fig. 21. The power transmission pattern from the secondary coil 43 to the secondary battery 46 of the electric toothbrush 260 is the same as that of the third embodiment, and thus the description thereof will be omitted.

(A) The power transmission control unit 242 of the wash station 220 supplies the alternating current of the reference frequency FK to the first coil 521 to the third coil 523 by the control transmission circuit 241.

(B) The first coil 521 to the third coil 523 generate an alternating magnetic flux by supplying an alternating current.

(C) The AC magnetic flux of the first coil 521 generates an AC power and an AC magnetic flux of the reference frequency FK by interlinking with the first relay coil 531.

(D) the AC flux of the second coil 522 is connected to the second trunk The circle 532 interconnects the alternating current and the alternating magnetic flux of the reference frequency FK.

(E) The AC magnetic flux of the third coil 523 generates an alternating current and an alternating magnetic flux of the reference frequency FK by interlinking with the third relay coil 533.

(F) At least one of the AC magnetic fluxes of the respective relay coils 531 to 533 is interlocked with the auxiliary coil 44 of the electric toothbrush 260.

The content of the control performed by the power transmission control unit 242 in Fig. 16 will be described.

(A) The power transmission control unit 242 detects that any of the doors 511 to 513 is turned on based on the signal received by each of the switches 514 to 516, and detects the selected power switch based on the pilot number received by the power switch 517. When the state of 517 is on, power is supplied to each of the coils 521 to 523. Thereby, electric power is transmitted from the coils 521 to 523 to the electric toothbrush 260.

(B) The power transmission control unit 242 detects that any of the gates 511 to 513 is turned on based on the signal received by each of the switches 514 to 516, and detects the selected power switch based on the cutoff signal received by the power switch 517. In the off state of 517, power is not supplied to the respective coils 521 to 523.

(C) The power transmission control unit 242 detects that the doors 511 to 513 are turned off based on the signals received by the switches 514 to 516, and detects that the response is received by the electric toothbrush 260. At the time of the toothbrush 260, the charging of the secondary battery 46 of the electric toothbrush 260 is started. Next, when the signal indicating the end of charging is received by the electric toothbrush 260, the charging of the battery 46 is terminated twice.

(D) The power transmission control unit 242 detects that each of the doors 511 to 513 is off based on the signal received by each of the switches 514 to 516, based on the power supply. The communication number received by the terminal 517 is the same as the supply of power to the coils 521 to 523. That is, when the doors 511 to 513 are turned off, the power transmission to the electric toothbrush 260 cannot be started by the operation of the power switch 517.

The non-contact power transmission device 210 of the sixth embodiment is an effect of (1) to (3) achieved by the non-contact power transmission device 210 of the third embodiment, and a non-contact power transmission of the fourth embodiment. In addition to the effect of (4) achieved by the device 210, the following effects can be achieved.

(5) The non-contact power transmission device 210 includes the first coil 521 to the third coil 523. According to this configuration, the power transmission range to the electric toothbrush 260 can be expanded as compared with the wash table having only one primary coil.

(6) The left door 512 and the right door 513 of the non-contact power transmission device 210 have the second coil 522 or the third coil 523. According to this configuration, when the left door 512 and the right door 513 are in the open state, the power transmission range from the washstand 220 to the electric toothbrush 260 can be expanded. Therefore, when the user uses the electric toothbrush 260, electric power can be appropriately transmitted to the electric toothbrush 260 even if the position of the electric toothbrush 260 relative to the washstand 220 is frequently changed.

A modification of the third to sixth embodiments of the present invention is shown. The following modifications can also be combined with each other.

The washstand 220 of the third and fourth embodiments (fourth diagram) has a first relay coil 231 and a second relay coil 232. On the other hand, in the wash table 220 of the modification, at least one of the first relay coil 231 and the second relay coil 232 is omitted.

The first to third relay coils 231 to 233 and the first to fourth relay coils 531 to 323 to the third and sixth embodiments (fourth and twenty-first embodiments) The 533 is located in the washstand 220. On the other hand, at least one of the first to sixth relay coils 231 (531) to 233 (533) of the modification is provided separately from the washstand 220. In this case, at least one of the first relay coil 231 (531) to the third relay coil 233 (533) can be freely changed with respect to the position of the washstand 220.

The washing machine 391 of the fourth embodiment (Fig. 18) has one relay coil 392. On the other hand, the cleaner 391 of the modification has a plurality of relay coils 392.

The cosmetic bag 400 of the fifth embodiment (Fig. 19) has a relay coil 402 on one side of the casing 401. On the other hand, the cosmetic bag 400 of the modification has the relay coil 402 on both sides of the casing 401.

The washstand 220 of the third to fifth embodiments (Fig. 14 and Fig. 17) has a primary coil 230. On the other hand, the wash table 220 of the modified example has a plurality of primary coils 230.

The cabinet 510 of the sixth embodiment (Fig. 11) has a first coil 521 to a third coil 523. On the other hand, the cabinet 510 of the modification omits one or two of the first coil 521 to the third coil 523. In the cabinet 510, the relay coil corresponding to the omitted coil can be omitted.

The relay coils 231 to 233 or the respective relay coils 531 to 533 of the third to sixth embodiments (fourteenth, eighteenth, twenty-first, and twenty-first drawings) are not connected to an electrical load. on the other hand. At least one of the relay coils 231 to 233 of the modification or at least one of the relay coils 531 to 533 is connected to another electrical load. In this configuration, when the light-emitting diode is used as another electrical load, the magnetic flux and each of the relay coils 231 to 233 are used. Or each of the relay coils 531 to 533 is interconnected to illuminate the light-emitting diode.

The present invention is also applicable to other power receiving devices other than the electric toothbrush 260 of the third, fifth, and sixth embodiments (fourth, twenty, and twenty-first embodiments). As other power receiving devices, an electric razor, a nose hair clipper, or a hair dryer can be exemplified. This power receiving device has a configuration following the third, fifth, and sixth embodiments. Further, the effects of the third, fifth, and sixth embodiments can be achieved.

The present invention is also applicable to other power transmitting devices than the left mirror 211A of the rinsing table 220 as the power transmitting device in the third to sixth embodiments (fourteenth, seventeenth, nineteenth, and eleventh drawings). As another power transmitting device, for example, a built-in part of a kitchen or a vehicle can be exemplified. This power transmission device has a configuration in accordance with the third to sixth embodiments. Further, the effects of the third to sixth embodiments can be achieved.

10‧‧‧ Non-contact power transmission device

20‧‧‧Power transmission device

21‧‧1 times coil

22‧‧‧ Magnetic sheet

23‧‧‧ housing

40‧‧‧Electric toothbrush

41‧‧‧ body shell

42‧‧‧Accessories

42A‧‧‧ brush part

43‧‧2 times coil

44‧‧‧Auxiliary coil

45‧‧‧Magnetic core

46‧‧‧2 batteries

47‧‧‧Electric motor

Y‧‧‧The direction of the width of the electric toothbrush 40

X1‧‧‧Axis direction of power transmission device 20

X2‧‧‧ electric toothbrush 40 long direction

Claims (22)

A non-contact power transmission device includes: a power transmission device including a primary coil; and a power receiving device including a secondary coil and a circuit capable of receiving a current generated in the secondary coil, wherein the power receiving device includes no circuit The auxiliary coil of the electrical connection, the diameter of the wire of the primary coil is larger than the diameter of the wire of the secondary coil and the auxiliary coil, and the diameter of the wire of the auxiliary coil is larger than the diameter of the wire of the secondary coil, The auxiliary coil has a Q value higher than a Q value of the secondary coil, and a magnetic flux of the primary coil is interlinked to the auxiliary coil. The non-contact power transmission device according to claim 1, wherein the auxiliary coil is disposed coaxially with the secondary coil system. The non-contact power transmission device according to claim 1, wherein the axis of the auxiliary coil and the axis of the secondary coil are arranged in parallel with each other. The non-contact power transmission device according to any one of claims 1 to 3, wherein the auxiliary coil is not in contact with the secondary coil. The non-contact power transmission device according to any one of claims 1 to 3, wherein at least one of the auxiliary coil and the secondary coil has a circular shape in plan view. The non-contact power transmission device according to any one of claims 1 to 3, wherein at least one of the auxiliary coil and the secondary coil It has a quadrangular shape in plan view. A non-contact power transmission device includes: a power transmission device including a primary coil; and a power receiving device including a secondary coil and a circuit capable of receiving a current generated in the secondary coil, wherein the power receiving device includes no circuit The auxiliary coil of the electrical connection, wherein the primary coil has a meandering wiring shape, and a diameter of a wire of the primary coil is larger than a diameter of a wire of the secondary coil and the auxiliary coil, and a diameter of a wire of the auxiliary coil The diameter of the wire of the secondary coil is larger than the diameter of the wire of the secondary coil so that the auxiliary coil has a Q value higher than the Q value of the secondary coil, and the magnetic flux of the primary coil is interlinked to the auxiliary coil. The non-contact power transmission device according to claim 7, wherein the primary coil includes a first linear portion and a second linear portion that are parallel to each other, and the first linear portion and the second line The connecting portion is connected to each other, and the connecting portion connects the end portion of the first linear portion and the end portion of the first linear portion so as to face the end portion of the second linear portion. A non-contact power transmission device includes: a power transmitting device including a primary coil; and a power receiving device including a secondary coil and a circuit capable of receiving a current generated in the secondary coil. The power receiving device includes an auxiliary coil that is not electrically connected to the circuit, and at least one of the auxiliary coil and the secondary coil includes a magnetic body, and a diameter of a wire of the primary coil is larger than a diameter of the secondary coil and the auxiliary coil The diameter of the wire is large, and the diameter of the wire of the auxiliary coil is larger than the diameter of the wire of the second coil, so that the auxiliary coil has a Q value higher than the Q value of the second coil, and the magnetic of the first coil The link is connected to the aforementioned auxiliary coil. A non-contact power transmission device includes: a power transmission device including a primary coil; and a power receiving device including a secondary coil and a circuit capable of receiving a current generated in the secondary coil, wherein the power receiving device includes no circuit An auxiliary coil electrically connected, wherein only the auxiliary coil includes a magnetic body, and a diameter of a lead wire of the primary coil is larger than a diameter of a lead wire of the secondary coil and the auxiliary coil, and the auxiliary coil of the secondary coil and the auxiliary coil The diameter of the wire of the auxiliary coil is larger than the diameter of the wire of the secondary coil, so that the auxiliary coil has a Q value higher than the Q value of the second coil, and the magnetic flux of the primary coil is interlinked to the auxiliary coil. . A non-contact power transmission device includes: a power transmission device, including a primary coil; and The power receiving device includes a secondary coil and a circuit that can receive a current generated in the secondary coil, wherein the power receiving device includes an auxiliary coil that is not electrically connected to the circuit, and only the second of the secondary coil and the auxiliary coil The secondary coil includes a magnetic body, and a diameter of the wire of the primary coil is larger than a diameter of a wire of the secondary coil and the auxiliary coil, and a diameter of a wire of the auxiliary coil is larger than a diameter of a wire of the secondary coil, so that the The auxiliary coil has a Q value higher than a Q value of the secondary coil, and the magnetic flux of the primary coil is interlinked to the auxiliary coil. A non-contact power transmission device includes: a power transmission device including a primary coil; and a power receiving device including a secondary coil and a circuit capable of receiving a current generated in the secondary coil, wherein the power receiving device includes no circuit An auxiliary coil electrically connected, wherein the auxiliary coil and the secondary coil include a common magnetic body, and a diameter of a wire of the primary coil is larger than a diameter of a wire of the secondary coil and the auxiliary coil, and a wire of the auxiliary coil The diameter is larger than the diameter of the wire of the secondary coil so that the auxiliary coil has a Q value higher than the Q value of the secondary coil, and the magnetic flux of the primary coil is interlinked to the auxiliary coil. A non-contact power transmission device comprising: The power transmitting device includes a primary coil; and the power receiving device includes a secondary coil and a circuit that can receive a current generated in the secondary coil, wherein the power receiving device includes an auxiliary coil that is not electrically connected to the circuit, and the secondary coil The first magnetic body is included, and the auxiliary coil includes a second magnetic body, and a diameter of a wire of the primary coil is larger than a diameter of a wire of the secondary coil and the auxiliary coil, and a diameter of a wire of the auxiliary coil is larger than the second The diameter of the wire of the secondary coil is large such that the auxiliary coil has a Q value higher than the Q value of the secondary coil, and the magnetic flux of the primary coil is interlinked to the auxiliary coil. The non-contact power transmission device according to any one of claims 9 to 13, wherein the magnetic body includes a can core. The non-contact power transmission device according to any one of claims 9 to 13, wherein the magnetic body comprises an E core. The non-contact power transmission device according to any one of claims 9 to 13, wherein the auxiliary coil and the secondary coil each have a hollow portion, and the magnetic body includes a hollow portion inserted into the auxiliary coil and the second time a cylindrical core of at least one of the hollow portions of the coil. A non-contact power transmission device includes: a power transmission device including a primary coil; a power receiving device including a secondary coil, and an acceptable second generation coil a current circuit, wherein the power receiving device includes an auxiliary coil that is not electrically connected to the circuit; and a relay coil is provided between the power transmitting device and the power receiving device to relay a magnetic wave from the primary coil to the auxiliary coil The diameter of the wire of the primary coil is larger than the diameter of the wire of the secondary coil and the auxiliary coil, and the diameter of the wire of the auxiliary coil is larger than the diameter of the wire of the secondary coil, so that the auxiliary The coil has a Q value higher than a Q value of the secondary coil, and the magnetic flux of the primary coil is interlinked to the auxiliary coil. The non-contact power transmission device according to claim 17, wherein the power transmission device includes a plurality of primary coils, and a magnetic flux of the plurality of primary coils is interlinked with the relay coil. The non-contact power transmission device according to claim 18, wherein the plurality of primary coils include a first primary coil and a second primary coil, and the first primary coil and the second coil The primary coils are arranged to change the positional relationship between each other. The non-contact power transmission device according to any one of claims 17 to 19, wherein the relay coil is one of a plurality of relay coils. The non-contact power transmission device according to any one of claims 17 to 19, wherein the relay coil is provided separately from the power transmission device, and the relay coil has a winding diameter smaller than a winding diameter of the primary coil. The non-contact power transmission device of any one of claims 17 to 19, wherein the aforementioned relay coil is not connected to an electrical load.