JP2012175806A - Non-contact type feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact type feeding device capable of suppressing degradation in the transmission efficiency of electric power from a transmission device to a reception device.SOLUTION: The non-contact type feeding device 1 comprises a transmission apparatus 10 including a primary coil 31 and a reception apparatus 20 including a secondary coil 41. A phase of an electric current supplied to the primary coil 31A and a phase of an electric current supplied to the primary coil 31B and the primary coil 31D are different from each other.

Description

  The present invention includes a power transmission device including a primary coil A1 and a primary coil A2 as a plurality of primary coils, and a secondary coil B1 and a secondary coil B2 as a plurality of secondary coils. The present invention relates to a non-contact type power feeding device provided that a power receiving device is provided and that an alternating magnetic flux is generated by supplying power to at least one of the primary side coil A1 and the primary side coil A2.

As said non-contact-type electric power feeder, the thing of patent document 1 is known.
In this type of non-contact power supply device, when power is transmitted from the power transmission device to the power reception device, current is supplied to each of the primary side coil A1 and the primary side coil A2. Then, an alternating current generated in each coil is linked to the corresponding secondary coil, whereby an induced current is generated in the coil.

Japanese Patent No. 4036813

  The inventor of the present application has a non-contact power feeding device having a plurality of primary coils and a plurality of secondary coils as described above, and a non-contact power feeding having one primary coil and one secondary coil. When compared with the device, it was confirmed by a test that the transmission efficiency of the former power may be lower than the transmission efficiency of the latter power. The reason is considered as follows.

  That is, in a non-contact power supply apparatus having a plurality of primary coils and a plurality of secondary coils, the magnetic path MX1 and the magnetic path shown in (A) below as the magnetic path of the magnetic flux in the primary coil A1. MX2 is formed. In addition, magnetic paths MY1 and MY2 shown in (B) below are formed as magnetic paths of the magnetic flux generated in the primary coil A2.

  (A) In the magnetic path MX1, the magnetic flux moves from the primary side coil A1 to the corresponding secondary side coil B1, and the magnetic flux that has passed through the secondary side coil B1 moves again to the primary side coil A1. On the other hand, in the magnetic path MX2, the magnetic flux moves from the primary coil A1 to the corresponding secondary coil B1, and the magnetic flux passing through the coil B1 moves to the secondary coil B2 adjacent to the secondary coil B1. Then, the magnetic flux that has passed through the coil B2 moves to the primary coil A2 corresponding to the secondary coil B2, and the magnetic flux that has passed through the coil A2 moves again to the primary coil A1.

  (B) In the magnetic path MY1, the magnetic flux moves from the primary side coil A2 to the corresponding secondary side coil B2, and the magnetic flux that has passed through the secondary side coil B2 moves again to the primary side coil A2. On the other hand, in the magnetic path MY2, the magnetic flux moves from the primary side coil A2 to the corresponding secondary side coil B2, and the magnetic flux passing through the coil B2 moves to the secondary side coil B1 adjacent to the secondary side coil B2. Then, the magnetic flux that has passed through the coil B1 moves to the primary coil A1 corresponding to the secondary coil B1, and the magnetic flux that has passed through the coil A1 moves again to the primary coil A2.

  Since the magnetic flux of magnetic path MX2 and the magnetic flux of magnetic path MY2 move in opposite directions as described above, power transmission efficiency is reduced due to the cancellation of these magnetic fluxes. It is predicted that

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a non-contact power supply device that can suppress a reduction in power transmission efficiency from the power transmission device to the power reception device. It is in.

Means for achieving the above object will be described below.
-In the non-contact-type electric power feeder of this invention, the power transmission apparatus containing the primary side coil A1 and the primary side coil A2 as a some primary side coil, and the secondary side coil B1 as a some secondary side coil And a power receiving device including the secondary coil B2 and that an alternating magnetic flux is generated by supplying power to at least one of the primary coil A1 and the primary coil A2. The phase of the current supplied to the primary side coil A1 and the phase of the current supplied to the primary side coil A2 are different from each other.

  In this non-contact power supply device, the difference between the phase of the current supplied to the primary side coil A1 and the phase of the current supplied to the primary side coil A2 is larger than “90 °” and “ It is preferably smaller than “270 °”.

  -In this non-contact-type electric power feeder, it is preferable that the difference between the phase of the current supplied to the primary side coil A1 and the phase of the current supplied to the primary side coil A2 is "180 °". .

  -In this non-contact-type electric power feeder, in addition to the primary side coil A1 and the primary side coil A2, the primary side coil A3 is provided in the power transmission device as the plurality of primary side coils. The distance between the primary coil A1 and the primary coil A2 is an inter-coil distance LA, and the distance between the primary coil A2 and the primary coil A3 is an inter-coil distance LB. The distance LA is smaller than the inter-coil distance LB, and the difference between the phase of the current supplied to the primary coil A1 and the phase of the current supplied to the primary coil A2 is a first phase difference. When the difference between the phase of the current supplied to the primary coil A1 and the phase of the current supplied to the primary coil A3 is a second phase difference, the first phase difference is the second phase difference. Larger than the phase difference is preferred That's right.

  -In this non-contact-type electric power feeder, in addition to the primary side coil A1, the primary side coil A2, and the primary side coil A3, the primary side coil A4 is used as the plurality of primary side coils. The primary coil is provided in the power transmission device, the diameters of the primary coils are the same, and the central line of the primary coil A1 is a first central line. The center line of A2 is the second center line, the center line of the primary coil A3 is the third center line, the center line of the primary coil A4 is the fourth center line, the first center line, Each of the plurality of primary coils is disposed such that the second center line, the third center line, and the fourth center line are parallel to each other, and the center lines of the plurality of primary coils are In this reference plane, an orthogonal plane is the reference plane. The first center line, the second center line, the third center line, and the fourth center line each form an apex of a square, and in the square, the first center line and the third center line are When the third phase difference is defined as being located on the diagonal line and the difference between the phase of the current supplied to the primary side coil A1 and the phase of the current supplied to the primary side coil A4, It is preferable that one phase difference and the third phase difference are larger than the second phase difference.

-In this non-contact-type electric power feeder, it is preferable that the said 1st phase difference and the said 3rd phase difference are mutually the same magnitude | sizes.
In this non-contact power supply device, it is preferable that the first phase difference and the third phase difference are larger than “90 °” and smaller than “270 °”.

-In this non-contact-type electric power feeder, it is preferable that the said 1st phase difference and the said 3rd phase difference are "180 degrees".
-In this non-contact-type electric power feeder, it is preferable that the said 2nd phase difference is "0 degree".

  -In this non-contact-type electric power feeder, it is preferable that a magnetic body is provided in each of the plurality of primary coils, and that the magnetic bodies of the plurality of primary coils are independent of each other.

-In this non-contact-type electric power feeder, it is preferable that the magnetic body which covers at least 2 of the said some primary side coils is provided.
-In this non-contact-type electric power feeder, it is preferable that the usage form of these several primary side coils is changed according to the signal transmitted to the said power transmission apparatus from the said power receiving apparatus.

  -In this non-contact-type electric power feeder, it is preferable that the usage form of these primary side coils is changed according to the charge condition of the said receiving device.

  ADVANTAGE OF THE INVENTION According to this invention, the non-contact-type electric power feeder which can suppress that the transmission efficiency of the electric power from a power transmission apparatus to a power receiving apparatus falls can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS About the non-contact-type electric power feeder of one Embodiment of this invention, (a) is sectional drawing which shows the cross-sectional structure, (b) is a top view which shows the planar structure of a power transmission apparatus. The circuit diagram which shows the circuit structure about the non-contact-type electric power feeder of the embodiment. The time chart which shows the energization timing of each switching element and each primary side coil about the non-contact-type electric power feeder of the embodiment. About the non-contact-type electric power feeder of the same embodiment, and the comparative electric power feeder as the comparative example, (a) is a sectional view showing typically the flow of magnetic flux in the non-contact-type electric power feeder, (b) is the comparative electric power feeding Sectional drawing which shows typically the flow of the magnetic flux in an apparatus. The flowchart which shows the procedure of coil selection control about the non-contact-type electric power feeder of the embodiment. The flowchart which shows the procedure of change control at the time of charge about the non-contact-type electric power feeder of the embodiment. (A) is sectional drawing which shows the cross-section, and (b) is a top view which shows the planar structure of a power transmission apparatus about the other non-contact-type electric power feeder of this invention. (A) is sectional drawing which shows the cross-section, and (b) is a top view which shows the planar structure of a power transmission apparatus about the other non-contact-type electric power feeder of this invention. (A) is sectional drawing which shows the cross-section, and (b) is a top view which shows the planar structure of a power transmission apparatus about the other non-contact-type electric power feeder of this invention.

With reference to FIG. 1, the structure of the non-contact-type electric power feeder 1 is demonstrated.
The non-contact power supply device 1 includes a power receiving device 20 having a secondary battery 22 and a power transmitting device 10 in the power receiving device 20. As the power receiving device 20, a digital video camera, a portable game machine, a notebook computer, or the like is used.

  The power transmission device 10 is provided with a primary coil module 30 that transmits electric power to the power receiving device 20 and a housing 11 that houses various components including the primary coil module 30. A mounting surface 11 </ b> A for mounting the power receiving device 20 is formed on the housing 11.

  The primary coil module 30 includes one magnetic sheet 32 formed of an amorphous material and four primary coils 31, that is, an eleventh coil 31A, a twelfth coil 31B, a thirteenth coil 31C, and a fourteenth coil. A coil 31D is provided. In the following description, the description of “each primary coil 31” indicates each of the eleventh coil 31A to the fourteenth coil 31D.

  As each primary side coil 31, the planar coil by which the conductive wire was wound by the plane direction is used. Each primary coil 31 has the same inner diameter, outer diameter, and number of turns. As the conductive wire of each primary side coil 31, one constituted by a plurality of litz wires is used.

  The magnetic sheet 32 is formed with a coil arrangement surface on which the four primary coils 31 are placed. The area of the coil mounting surface is larger than the sum of the areas of the bottom surfaces of the four primary coils 31. Each primary coil 31 is placed on the coil mounting surface so that the entire bottom surface of each primary coil 31 is in contact. That is, in the plan view of the power transmission device 10, the magnetic sheet 32 is disposed between the adjacent primary coils 31 in addition to the portion corresponding to the bottom surface of each primary coil 31.

  The power receiving device 20 includes a secondary coil module 40 that receives power transmitted from the power transmitting device 10, and a housing 21 that houses various components including the secondary coil module 40 and the secondary battery 22. It has been.

  The secondary coil module 40 includes one magnetic sheet 42 made of an amorphous material and four secondary coils 41, that is, a 21st coil 41A, a 22nd coil 41B, a 23rd coil 41C, and a 24th coil. A coil 41D is provided. In the following description, the description of “each secondary coil 41” indicates each of the 21st coil 41A to the 24th coil 41D.

  As each secondary coil 41, a planar coil in which a conductive wire is wound in the planar direction is used. Each secondary coil 41 has the same inner diameter, outer diameter, and number of turns. As the conductive wire of each secondary side coil 41, one constituted by a plurality of litz wires is used.

  The magnetic sheet 42 is formed with a coil arrangement surface for placing each secondary coil 41. The area of the coil mounting surface is larger than the sum of the areas of the bottom surfaces of the secondary coils 41. Each secondary coil 41 is placed on the coil mounting surface so that the entire bottom surface of each secondary coil 41 is in contact. That is, in the plan view of the power receiving device 20, the magnetic sheet 42 is disposed between the adjacent secondary coils 41 in addition to the portion corresponding to the bottom surface of each secondary coil 41.

The relationship between each primary coil 31 and each secondary coil 41 is shown below.
The inner diameter of each primary coil 31 is larger than the inner diameter of each secondary coil 41.
The outer diameter of each primary coil 31 is larger than the outer diameter of each secondary coil 41.
The number of turns of each primary coil 31 is larger than the number of turns of each secondary coil 41.

The arrangement | positioning aspect of each primary side coil 31 and each secondary side coil 41 is demonstrated.
Here, the center line of each primary side coil 31 is defined as follows.
(A) The center line of the eleventh coil 31A is referred to as an “11th center line C11”.
(B) The center line of the twelfth coil 31B is referred to as a “twelfth center line C12”.
(C) The center line of the thirteenth coil 31C is referred to as “the thirteenth center line C13”.
(D) The center line of the fourteenth coil 31D is defined as “fourteenth center line C14”.

The center line of each secondary coil 41 is defined as follows.
(A) The center line of the 21st coil 41A is defined as “21st center line C21”.
(B) The center line of the 22nd coil 41B is defined as “22nd center line C22”.
(C) The center line of the 23rd coil 41C is defined as “23rd center line C23”.
(D) The center line of the 24th coil 41D is defined as “24th center line C24”.

Further, the following is defined as a virtual plane on the non-contact power supply device 1.
(A) A plane orthogonal to the center lines C11 to C14 is referred to as a “first reference plane”.
(B) A plane perpendicular to the center lines C21 to C24 is defined as a “second reference plane”.

In the power transmission apparatus 10, each primary side coil 31 is arrange | positioned as follows.
Each primary coil 31 is arranged so that the eleventh center line C11, the twelfth center line C12, the thirteenth center line C13, and the fourteenth center line C14 are parallel to each other. In addition, on the first reference plane, the eleventh center line C11, the twelfth center line C12, the thirteenth center line C13, and the fourteenth center line C14 are arranged so as to form square vertices, respectively.

  That is, in the four primary coils 31, the eleventh coil 31A, the twelfth coil 31B, and the fourteenth coil 31D are adjacent to each other. Further, the eleventh coil 31A and the thirteenth coil 31C are in a facing relationship.

Here, a line segment connecting the center lines on the first reference plane is defined as follows.
(A) A line segment connecting the eleventh center line C11 and the twelfth center line C12 is defined as a side HA.
(B) A line segment connecting the twelfth center line C12 and the thirteenth center line C13 is defined as a side HB.
(C) A line segment connecting the thirteenth center line C13 and the fourteenth center line C14 is defined as a side HC.
(D) A line segment connecting the fourteenth center line C14 and the eleventh center line C11 is defined as a side HD.

  On the first reference plane, a square is formed by the side HA, the side HB, the side HC, and the side HD. Each primary coil 31 is arranged so that the square is similar to the magnetic sheet 32.

In the power receiving device 20, the secondary coils 41 are arranged as follows.
Each secondary coil 41 is arranged so that the 21st center line C21, the 22nd center line C22, the 23rd center line C23, and the 24th center line C24 are parallel to each other. On the second reference plane, the twenty-first center line C21, the twenty-second center line C22, the twenty-third center line C23, and the twenty-fourth center line C24 are arranged so as to form square vertices, respectively.

  That is, in the four secondary coils 41, the 21st coil 41A, the 22nd coil 41B, and the 24th coil 41D are adjacent to each other. Further, the 21st coil 41A and the 23rd coil 41C are in a facing relationship.

Here, a line segment connecting the center lines on the second reference plane is defined as follows.
(A) A line segment connecting the 21st center line C21 and the 22nd center line C22 is defined as a side SA.
(B) A line segment connecting the 22nd center line C22 and the 23rd center line C23 is defined as a side SB.
(C) A line segment connecting the 23rd center line C23 and the 24th center line C24 is defined as a side SC.
(D) A line segment connecting the 24th center line C24 and the 21st center line C21 is defined as a side SD.

  On the second reference plane, a square is formed by the side SA, the side SB, the side and SC, and the side SD. Each secondary coil 41 is arranged so that the square is similar to the magnetic sheet 42.

The distance between the coils in the power transmission device 10 and the power reception device 20 will be described.
The distance between the primary coils 31 is defined as follows.
(A) A distance between the eleventh coil 31A and the twelfth coil 31B is defined as an “intercoil distance LA”. This inter-coil distance LA corresponds to the distance between the eleventh center line C11 and the twelfth center line C12 on the first reference plane.

  (B) A distance between the eleventh coil 31A and the thirteenth coil 31C is defined as an “intercoil distance LB”. This inter-coil distance LB corresponds to the distance between the eleventh center line C11 and the thirteenth center line C13 on the first reference plane.

  (C) The distance between the eleventh coil 31 </ b> A and the fourteenth coil 31 </ b> D is referred to as “intercoil distance LC”. The inter-coil distance LC corresponds to the distance between the eleventh center line C11 and the fourteenth center line C14 on the first reference plane.

  In the power transmission apparatus 10, the distance between each primary side coil 31 is set as follows. That is, the inter-coil distance LA and the inter-coil distance LC are equal to each other. Further, the inter-coil distance LB is larger than the inter-coil distance LA and the inter-coil distance LC.

The distance between each secondary coil 41 is defined as follows.
(A) The distance between the twenty-first coil 41A and the twenty-second coil 41B is defined as “inter-coil distance LD”. This inter-coil distance LD corresponds to the distance between the 21st center line C21 and the 22nd center line C22 on the second reference plane.

  (B) The distance between the 21st coil 41A and the 23rd coil 41C is defined as “distance between coils LE”. This inter-coil distance LE corresponds to the distance between the 21st center line C21 and the 23rd center line C23 on the second reference plane.

  (C) The distance between the twenty-first coil 41A and the twenty-fourth coil 41D is defined as “inter-coil distance LF”. This inter-coil distance LF corresponds to the distance between the 21st center line C21 and the 24th center line C24 on the second reference plane.

  In the power receiving device 20, the distance between the secondary coils 41 is set as follows. That is, the inter-coil distance LD and the inter-coil distance LF are equal to each other. Further, the inter-coil distance LE is larger than the inter-coil distance LD and the inter-coil distance LF.

With reference to FIG. 2, a circuit configuration of the non-contact power feeding device 1 will be described.
The non-contact power supply device 1 is provided with a primary circuit 50 that generates alternating power and a secondary circuit 60 that converts the alternating power into DC power. The primary side circuit 50 is provided in the power transmission device 10. The secondary circuit 60 is provided in the power receiving device 20.

The configuration of the primary circuit 50 will be described.
The primary circuit 50 includes a power supply circuit 53 that converts an alternating current of the commercial power supply AC into a direct current, four power transmission circuits 51 corresponding to the primary coils 31, and energization of the primary coils 31. A power transmission control unit 54 that performs control and the like is provided.

  Each power transmission circuit 51 is provided with a primary coil 31, a switching element TR, a first resistor R1 as a gate resistor, a first diode D1, and a reset circuit 52. As the switching element TR, a field effect transistor (FET) is used.

  The first resistor R1 is connected in series with the switching element TR. The first diode D1 is connected in parallel to the switching element TR. The switching element TR is connected in series to the power transmission control unit 54 via the first resistor R1.

  The reset circuit 52 is provided as a circuit for suppressing the excitation current generated in the primary coil 31 when the switching element TR is off from flowing to the power supply circuit 53. The reset circuit 52 is provided with a first capacitor C1, a second diode D2, and a second resistor R2.

  The first capacitor C1 is connected in parallel with the primary coil 31 and in series with the second diode D2 and the second resistor R2. The second diode D2 is connected in parallel with the second resistor R2. In each power transmission circuit 51, the first capacitor C1 and the primary coil 31 constitute a resonance circuit.

The configuration of the secondary circuit 60 will be described.
The secondary circuit 60 is provided with four power receiving circuits 61 corresponding to the respective power transmitting circuits 51 and a power receiving control unit 63 that detects the charging state of the secondary battery 22.

  Each power receiving circuit 61 is connected to each other in series. The power receiving circuit 61 corresponding to the twenty-first coil 41 </ b> A and the power receiving circuit 61 corresponding to the twenty-fourth coil 41 </ b> D are respectively connected in series to the power receiving control unit 63.

  The power receiving circuit 61 is provided with a secondary coil 41 that receives a magnetic flux generated by the primary coil 31 and a full-wave rectifier circuit 62 that converts the alternating power of the secondary coil 41 into DC power. In addition, a second capacitor C2 for matching impedance between the primary side circuit 50 and the secondary side circuit 60 and a third capacitor C3 for smoothing the DC power of the full-wave rectifier circuit 62 are provided. .

  As the full-wave rectifier circuit 62, a bridge-type rectifier circuit constituted by four second diodes D2 is used. The full wave rectification circuit 62 is connected in parallel to the third capacitor C3.

A power supply mode of the non-contact power supply apparatus 1 will be described.
The power transmission control unit 54 applies a control voltage to each switching element TR via each first resistor R1, and switches each switching element TR on and off. Thereby, since alternating power is induced in each of the primary side coils 31, high frequency alternating magnetic fluxes are generated in the respective primary side coils 31.

  In the secondary side coil 41, alternating power is generated by interlinking with the alternating magnetic flux of the primary side coil 31. This alternating power is supplied to the full-wave rectifier circuit 62 through the second capacitor C2 and the third capacitor C3, thereby being converted into smoothed DC power. Then, the smoothed DC power is supplied to the secondary battery 22 to charge the secondary battery 22.

  With reference to FIG. 3, the energization control of each primary coil 31 by the power transmission control unit 54 will be described. In the following description, each component given a reference numeral is the same as that shown in FIG.

The power transmission control unit 54 controls each switching element TR as follows.
(A) The switching element TR of the eleventh coil 31A and the switching element TR of the thirteenth coil 31C are switched on and off at the same phase. Thereby, the current of the eleventh coil 31A and the current of the thirteenth coil 31C change in the same phase.

  (B) The switching element TR of the twelfth coil 31B and the switching element TR of the fourteenth coil 31D are switched on and off at the same phase. Thereby, the current of the twelfth coil 31B and the current of the fourteenth coil 31D change in the same phase.

  (C) Between the eleventh coil 31A and the thirteenth coil 31C and the twelfth coil 31B and the fourteenth coil 31D, the switching elements TR are switched on and off at phases different by “180 °”.

Here, the phase difference between the primary coils 31 is defined as follows.
(A) The difference between the phase of the current supplied to the eleventh coil 31A and the phase of the current supplied to the twelfth coil 31B is referred to as a “first phase difference FD1”.
(B) The difference between the phase of the current supplied to the twelfth coil 31B and the phase of the current supplied to the thirteenth coil 31C is referred to as a “second phase difference FD2”.
(C) The difference between the phase of the current supplied to the eleventh coil 31A and the phase of the current supplied to the fourteenth coil 31D is referred to as a “third phase difference FD3”.
(D) The difference between the phase of the current supplied to the twelfth coil 31B and the phase of the current supplied to the thirteenth coil 31C is referred to as a “fourth phase difference FD4”.
(E) The difference between the phase of the current supplied to the twelfth coil 31B and the phase of the current supplied to the fourteenth coil 31D is referred to as a “fifth phase difference FD5”.
(F) The difference between the phase of the current supplied to the thirteenth coil 31C and the phase of the current supplied to the fourteenth coil 31D is referred to as a “sixth phase difference FD6”.

The phase difference of each primary side coil 31 is set to the following relationship.
(A) The first phase difference FD1 is set to “180 °”.
(B) The second phase difference FD2 is set to “0 °”.
(C) The third phase difference FD3 is set to “180 °”.
(D) The fourth phase difference FD4 is set to “180 °”.
(E) The fifth phase difference FD5 is set to “0 °”.
(F) The sixth phase difference FD6 is set to “180 °”.

  The present inventor conducted the following simulation test in order to verify the relationship between the phase difference setting mode and the power transmission efficiency. As a result, for example, in the contactless power supply device 1 of the present embodiment, it was confirmed that the power transmission efficiency was improved as compared with a device in which the first phase difference FD1 was set to “0 °”.

  In this test, the following conditions were used. In each experiment, the power transmission efficiency was evaluated based on the magnitude of the current input to the primary coil 31 and the magnitude and ratio of the current output from the secondary coil 41.

The following conditions were set as conditions for changing the first phase difference FD1. In the following (Condition 11) to (Condition 17), the same conditions are set except that the first phase difference FD1 is different.
(Condition 11): The first phase difference FD1 is set to “0 °”.
(Condition 12): The first phase difference FD1 is set to “30 °”.
(Condition 13): The first phase difference FD1 is set to “60 °”.
(Condition 14): The first phase difference FD1 is set to “90 °”.
(Condition 15): The first phase difference FD1 is set to “120 °”.
(Condition 16): The first phase difference FD1 is set to “150 °”.
(Condition 17): The first phase difference FD1 is set to “180 °”.

The following conditions were set as conditions for changing the number of coils used for power transmission.
(Condition 21): Electric power is transmitted from the power transmitting apparatus 10 to the power receiving apparatus 20 by supplying current only to the eleventh coil 31A.
(Condition 22): Electric power is transmitted from the power transmitting device 10 to the power receiving device 20 using a device obtained by adding the following changes to the non-contact power feeding device 1 of the present embodiment. That is, the twelfth coil 31B to the fourteenth coil 31D and the twenty-second coil 41B to the twenty-fourth coil 41D are omitted, and power is transmitted using only the eleventh coil 31A and the twenty-first coil 41A.

The following results were obtained by experiments based on the above conditions.
(Result 1): (Condition 17) among (Condition 11) to (Condition 17) maximizes the power transmission efficiency.
(Result 2): (Condition 11) among (Condition 11) to (Condition 17) has the minimum power transmission efficiency.
(Result 3): In (Condition 12) to (Condition 16), the power transmission efficiency increases as the first phase difference FD1 increases.
(Result 4): The power transmission efficiency of (Condition 11) to (Condition 14) is lower than the power transmission efficiency of (Condition 21).
(Result 5): The power transmission efficiency of (Condition 15) to (Condition 17) is higher than the power transmission efficiency of (Condition 21).
(Result 6): The power transmission efficiency of (Condition 11) is lower than the power transmission efficiency of (Condition 22).
(Result 7): The power transmission efficiency of (Condition 12) to (Condition 17) is higher than the power transmission efficiency of (Condition 22).

  In (Condition 11) to (Condition 17), it is confirmed that the same results as (Result 1) to (Result 7) can be obtained even under the condition where the first phase difference FD1 is changed to the third phase difference FD3. ing.

The reason why each of the above results was obtained will be described.
Here, for comparison with a non-contact power supply device in which (Condition 11) is set, that is, a non-contact power supply device in which the first phase difference FD1 is set to “0 °” (hereinafter referred to as “comparative power supply device”). The reason will be explained. In addition, the reason demonstrated below is what this inventor estimated based on the test result, and may differ from the phenomenon which has actually arisen.

  With reference to FIG. 4, the flow of the magnetic flux in each of the non-contact-type electric power feeder 1 and the comparative electric power feeder is demonstrated. In the comparative power feeding device, the same configuration as that of the non-contact power feeding device 1 is used except that the first phase difference FD1 is set to “0 °”.

  As shown in FIG. 4B, in the comparative power feeding device, a magnetic path MA1 and a magnetic path MA2 shown in the following (A) are formed as magnetic paths of the magnetic flux generated in the eleventh coil 31A. In addition, magnetic paths MB1 and MB2 shown in (B) below are formed as magnetic paths of the magnetic flux generated in the twelfth coil 31B.

  (A) In the magnetic path MA1, the magnetic flux moves from the eleventh coil 31A to the corresponding twenty-first coil 41A, and the magnetic flux that has passed through the coil 41A moves again to the eleventh coil 31A. Further, the magnetic flux moves in the clockwise direction in the cross section of FIG.

  On the other hand, in the magnetic path MA2, the magnetic flux moves from the eleventh coil 31A to the corresponding twenty-first coil 41A, and the magnetic flux that has passed through the coil 41A moves to the twenty-second coil 41B adjacent to the twenty-first coil 41A. The magnetic flux that has passed through 41B moves to the twelfth coil 31B corresponding to the twenty-second coil 41B, and the magnetic flux that has passed through the coil 31B moves again to the eleventh coil 31A. Further, the magnetic flux moves in the counterclockwise direction in the cross section of FIG.

  (B) In the magnetic path MB1, the magnetic flux moves from the twelfth coil 31B to the corresponding twenty-second coil 41B, and the magnetic flux that has passed through the coil 41B moves to the twelfth coil 31B again. Further, the magnetic flux moves in the counterclockwise direction in the cross section of FIG.

  On the other hand, in the magnetic path MB2, the magnetic flux moves from the twelfth coil 31B to the corresponding twenty-second coil 41B, and the magnetic flux that has passed through the coil 41B moves to the twenty-first coil 41A adjacent to the twenty-second coil 41B. The magnetic flux that has passed through 41A moves to the eleventh coil 31A corresponding to the twenty-first coil 41A, and the magnetic flux that has passed through the coil 31A moves again to the twelfth coil 31B. Further, the magnetic flux moves in the counterclockwise direction in the cross section of FIG.

  Since the magnetic flux of the magnetic path MA2 and the magnetic flux of the magnetic path MB2 move in opposite directions as described above, the power transmission efficiency is reduced due to the cancellation of these magnetic fluxes. It is predicted that

  As shown in FIG. 4A, in the non-contact power feeding device 1, a magnetic path MA1 and a magnetic path MA2 shown in (A) below are formed as magnetic paths of the magnetic flux generated in the eleventh coil 31A. The In addition, magnetic paths MB1 and MB2 shown in (B) below are formed as magnetic paths of the magnetic flux generated in the twelfth coil 31B.

  (A) In the magnetic path MA1, the magnetic flux moves from the eleventh coil 31A to the corresponding twenty-first coil 41A, and the magnetic flux that has passed through the coil 41A moves again to the eleventh coil 31A. Further, the magnetic flux moves in the clockwise direction in the cross section of FIG.

  On the other hand, in the magnetic path MA2, the magnetic flux moves from the eleventh coil 31A to the corresponding twenty-first coil 41A, and the magnetic flux that has passed through the coil 41A moves to the twenty-second coil 41B adjacent to the twenty-first coil 41A. The magnetic flux that has passed through 41B moves to the twelfth coil 31B corresponding to the twenty-second coil 41B, and the magnetic flux that has passed through the coil 31B moves again to the eleventh coil 31A. Further, the magnetic flux moves in the clockwise direction in the cross section of FIG.

  (B) In the magnetic path MB1, the magnetic flux moves from the twelfth coil 31B to the corresponding twenty-second coil 41B, and the magnetic flux that has passed through the coil 41B moves to the twelfth coil 31B again. Further, the magnetic flux moves in the clockwise direction in the cross section of FIG.

  On the other hand, in the magnetic path MB2, the magnetic flux moves from the twelfth coil 31B to the adjacent eleventh coil 31A, and the magnetic flux that has passed through the coil 31A moves to the twenty-first coil 41A corresponding to the eleventh coil 31A. The magnetic flux that has passed through 41A moves to the 22nd coil 41B adjacent to the 21st coil 41A, and the magnetic flux that has passed through the coil 41B moves again to the 12th coil 31B. Further, the magnetic flux moves in the clockwise direction in the cross section of FIG.

  Since the magnetic flux of the magnetic path MA2 and the magnetic flux of the magnetic path MB2 move in the same direction as described above, unlike the magnetic path of the comparative power feeding device shown in FIG. The magnetic fluxes are prevented from canceling each other. For this reason, in the non-contact-type electric power feeder 1, it is thought that the electric power transmission efficiency is improving rather than the comparative electric power feeder.

  In the non-contact power supply device 1, the flow of magnetic flux shown in FIG. 4A, that is, the magnetic field, throughout the period during which current is supplied to the primary coil 31 (hereinafter, “primary energization period”). A magnetic flux flow in which the magnetic flux in the path MA2 and the magnetic flux in the magnetic path MB2 move in the same direction (hereinafter, “same direction flow”) is generated.

  In the comparative power feeding device, the flow of magnetic flux shown in FIG. 4B throughout the primary energization period, that is, the flow of magnetic flux in which the magnetic flux of the magnetic path MA2 and the magnetic flux of the magnetic path MB2 move in opposite directions ( Hereinafter, “reverse flow”) occurs.

  In the non-contact power supply apparatus of (Condition 12) to (Condition 16), a period in which the same direction flow occurs and a period in which the reverse direction flow occurs are included in the primary energization period. Further, as the first phase difference FD1 increases, the ratio of the period in which the same direction flow occurs with respect to the primary energization period increases.

  For this reason, as seen in (Result 1), the transmission efficiency is maximized in the non-contact power feeding device 1. Further, as seen in (Result 2), the transmission efficiency is minimized in the comparative power feeding device. Further, as seen in (Result 3), the power transmission efficiency increases as the first phase difference FD1 increases.

  In the non-contact power feeding device 1 and the non-contact power feeding devices of (Condition 12) to (Condition 16), the magnetic flux of the magnetic path MA2 and the magnetic flux of the magnetic path MB2, that is, the primary coil 31 and the secondary side facing each other. Magnetic flux leaking from the magnetic path between the coil 41 (magnetic path MA1 and magnetic path MB1) is linked to another adjacent coil. For this reason, the magnetic flux leaking from the magnetic path also contributes to the transmission of power to the power receiving device 20.

  On the other hand, in the non-contact power supply device of (Condition 22), the magnetic flux leaking from the magnetic path between the opposing primary side coil 31 and secondary side coil 41 does not interlink with another coil. For this reason, the magnetic flux leaking from the magnetic path becomes a loss in the transmission of power to the power receiving device 20.

  For this reason, as seen in (Result 7), the non-contact power feeding device 1 and the non-contact power feeding device of (Condition 12) to (Condition 16) have a transmission efficiency of (Condition 22). Higher than the transmission efficiency. As can be seen from the above (Result 6), the comparative power feeding device has lower transmission efficiency than the non-contact power feeding device of (Condition 22). As described above, this is considered to be caused by the fact that the reverse flow of the magnetic flux occurs throughout the primary energization period in the comparative power feeding device.

  From the above, it is predicted that the transmission efficiency of the non-contact power feeding device of (Condition 12) to (Condition 14) will be higher than the transmission efficiency of the non-contact power feeding device of (Condition 21). According to (Result 4), the former efficiency is lower than the latter efficiency. The reason is considered as follows.

  The non-contact power supply device of (Condition 21) has the same configuration as the non-contact power supply device 1 in terms of hardware. For this reason, the magnetic flux leaking from the magnetic path between the opposing primary side coil 31 and secondary side coil 41 moves to the magnetic sheet 42, then moves in the same sheet 42, and is chained to the secondary side coil 41. Interact. That is, unlike the non-contact power supply device of (Condition 22), the magnetic flux leaking from the magnetic path is used for power transmission by the magnetic sheet 42.

  On the other hand, in the non-contact power feeding devices of (Condition 12) to (Condition 14), the first phase difference FD1 is relatively small, so that the ratio of the period in which the reverse flow occurs with respect to the primary energization period is large. For this reason, the non-contact type of the magnetic flux leaking from the magnetic path between the opposing primary side coil 31 and secondary side coil 41 has a degree that this contributes to the transmission of electric power to the power receiving device 20 (condition 22). It becomes smaller than the power feeding device.

  In this way, in the non-contact power supply device of (Condition 21), the magnetic flux leaking from the magnetic path between the primary side coil 31 and the secondary side coil 41 is recovered via the magnetic sheet 42. It is considered that the power transmission efficiency is higher than that of the non-contact power feeding device of (Condition 12) to (Condition 14).

The control performed by the power transmission device 10 will be described with reference to FIG.
The power transmission control unit 54 performs “authentication control” for determining whether or not the power receiving device 20 is mounted on the housing 11 of the power transmitting device 10 in FIG. 1, and battery information transmitted from the power receiving device 20. “Coil selection control” is performed to change the usage pattern of the primary coil 31 (hereinafter referred to as “coil usage pattern”).

  In addition to this, “charging frequency control” for adjusting the frequency of the current supplied to each primary coil 31 during charging of the power receiving device 20, and the coil usage mode are changed according to the state of charge of the secondary battery 22. “Charging change control” and “Charge stop control” for stopping charging of the power receiving device 20 by the power transmission device 10 are performed.

The power transmission device 10 is provided with the following first to fourth usage patterns as coil usage patterns. In addition, about the coil which is not shown to energize in each usage form, a non-energized state is maintained.
(A) In the first usage pattern, the eleventh coil 31A is energized.
(B) In the second usage pattern, the eleventh coil 31A and the twelfth coil 31B are energized.
(C) In the third usage pattern, the eleventh coil 31A to the thirteenth coil 31C are energized.
(D) In the fourth usage pattern, the eleventh coil 31A to the fourteenth coil 31D are energized.

  As battery information of the secondary battery 22, “battery information VA”, “battery information VB”, “battery information VC”, and “battery information VD” are prepared. Each battery information includes the battery material, rated voltage, and battery capacity of the secondary battery 22.

Each battery information shows the following contents.
(A) The battery information VA indicates that the secondary battery 22 is suitable for charging in the first usage pattern.
(B) The battery information VB indicates that the secondary battery 22 is suitable for charging in the second usage pattern.
(C) The battery information VC indicates that the secondary battery 22 is suitable for charging in the third usage pattern.
(D) The battery information VD indicates that the secondary battery 22 is suitable for charging in the fourth usage pattern.

  The charging state of the secondary battery 22 is determined by the first threshold value X1, the second threshold value X2, and the third threshold value X3, as “first charging state”, “second charging state”, “third charging state”, and “first charging state”. "4 state of charge". The second threshold value X2 is set in advance as a value larger than the first threshold value X1. Further, the third threshold value X3 is set in advance as a value larger than the second threshold value X2.

Each state of charge indicates the following state.
(A) In the first charge state, the charge amount is included between “0%” and the first threshold value X1.
(B) In the second charge state, the charge amount is included between the first threshold value X1 and the second threshold value X2.
(C) In the third charge state, the charge amount is included between the second threshold value X2 and the third threshold value X3.
(D) In the fourth charge state, the charge amount is included from the third threshold value X3 to less than full charge.

  As charging information of the secondary battery 22, “charging information CA”, “charging information CB”, “charging information CC”, and “charging information CD” are prepared. The charging information is updated according to the charging state of the secondary battery 22.

Each charging information indicates the following contents.
(A) The charging information CA indicates that the charging state is the first charging state.
(B) The charging information CB indicates that the charging state is the second charging state.
(C) The charging information CC indicates that the charging state is the third charging state.
(D) The charging information CD indicates that the charging state is the fourth charging state.

  The power transmission control unit 54 stores battery information VA to VD in advance in order to collate battery information transmitted from the power receiving device 20. The power reception control unit 63 stores any of battery information VA to VD corresponding to the secondary battery 22.

Authentication control is performed as follows.
The power transmission control unit 54 repeatedly performs control for transmitting the response request signal KA from the primary coil module 30 of FIG. 1 to the power receiving device 20 at predetermined time intervals. At least one of the primary side coils 31 is used for transmission of the response request signal KA.

  When the power receiving device 20 is mounted on the power transmitting device 10, the response request signal KA transmitted from the primary side coil module 30 is received by the power receiving control unit 63 via the secondary side coil module 40 in FIG. Received.

  When receiving the response request signal KA from the power transmission device 10, the power reception control unit 63 performs control for transmitting the response confirmation signal KB, the battery information signal KC, and the charging information signal KD from the secondary coil module 40. The battery information signal KC includes battery information of the power receiving device 20. Further, the charging information signal KD includes charging information of the secondary battery 22.

  When the power transmission control unit 54 receives the response confirmation signal KB from the power reception device 20, the power transmission control unit 54 determines that the power reception device 20 is mounted on the housing 11, and a flag indicating that the authentication of the power reception device 20 is established (hereinafter, “authentication”). The completion flag FK ") is set on. Then, in a state where the authentication completion flag FK is set, the authentication completion flag FK is turned off when the response confirmation signal KB from the power receiving apparatus 20 cannot be received for a certain period or more.

Coil selection control is performed as follows.
When the power transmission control unit 54 receives the battery information signal KC from the power receiving device 20, the power transmission control unit 54 confirms the content of the battery information included in the battery information signal KC. Then, one usage pattern is selected from a plurality of coil usage patterns in accordance with the content of the confirmed battery information.

The frequency control during charging is performed as follows.
The power reception control unit 63 determines whether or not the value of the direct current generated by the secondary circuit 60 (hereinafter, “charging current value AX”) is within a range suitable for charging the secondary battery 22. . Then, when it is determined that the charging current value AX is not suitable for charging, control for transmitting the output request signal KR from the secondary coil module 40 is performed. The output request signal KR includes information on the charging current value AX.

  The power transmission control unit 54 sets the frequency of the current to the resonance frequency when charging the power receiving device 20 by supplying the current to the primary coil module 30. On the other hand, when the output request signal KR is received from the power receiving device 20, the frequency of the current supplied to the primary coil module 30 is adjusted based on the charging current value AX.

The change control at the time of charging is performed as follows.
The power reception control unit 63 transmits a charging information signal KD including charging information to the power transmission device 10 when the response request signal KA is received from the power transmission device 10 and when the charging state of the secondary battery 22 is changed.

  When the power transmission control unit 54 receives the charging information signal KD from the power receiving device 20, the power transmission control unit 54 checks the charging information included in the charging information signal KD with the charging information stored in advance, and the charging information included in the charging information signal KD. Check the contents of the information. Then, one usage pattern is selected from a plurality of coil usage patterns according to the content of the confirmed charging information.

The charge stop control is performed as follows.
The power reception control unit 63 performs control for transmitting a charge stop signal KS from the secondary coil module 40 when the charged state of the secondary battery 22 is a fully charged state. The charge stop signal KS is transmitted as a signal indicating a request to end the charging of the secondary battery 22.

  The power transmission control unit 54 stops energization to the primary coil module 30 when receiving the charge stop signal KS from the power receiving device 20. That is, the charging of the power receiving device 20 by the power transmitting device 10 is terminated.

  The power transmission control unit 54 changes during charging until the authentication completion flag FK is set to OFF after the coil usage mode is selected by the coil selection control or until the charging stop signal KS is received from the power receiving device 20. Take control.

  With reference to FIG. 5, the specific process sequence of coil selection control is demonstrated. In the description of the coil selection control, each component having a reference numeral is the same as that shown in FIG.

  In the coil selection control, at least one determination process of steps S101 to S103 is performed to determine which of the battery information VA to VD corresponds to the battery information acquired from the power receiving device 20.

  In step S101, it is determined whether or not the battery information acquired from the power receiving device 20 is battery information VA. In step S102, it is determined whether or not the battery information acquired from the power receiving device 20 is battery information VB. In step S103, it is determined whether or not the battery information acquired from the power receiving device 20 is battery information VC.

Then, any one of the following processes (A) to (D) is performed according to the result of each determination.
(A) When an affirmative determination is made in step S101, that is, when it is determined that the battery information acquired from the power receiving device 20 is the battery information VA, the first usage pattern is selected as the coil usage pattern in step S114.

  (B) When a negative determination is made in step S101 and an affirmative determination is made in step S102, that is, when it is determined that the battery information acquired from the power receiving device 20 is the battery information VB, the second usage pattern is set as the coil usage pattern in step S113. select.

  (C) When a negative determination is made in steps S101 and S102 and an affirmative determination is made in step S103, that is, when it is determined that the battery information acquired from the power receiving device 20 is the battery information VC, the third usage is used as the coil usage pattern in step S112. Select the form.

  (D) When a negative determination is made in steps S101 to S103, that is, when it is determined that the battery information acquired from the power receiving device 20 is the battery information VD, the fourth usage pattern is selected as the coil usage pattern in step S111.

  With reference to FIG. 6, the specific process sequence of the change control at the time of charge is demonstrated. In the following description of the change control at the time of charging, each constituent element to which a reference numeral is attached indicates that shown in FIG.

  In the charging change control, at least one determination process of steps S201 to S203 is performed in order to determine which of the charging information CA to CD the charging information acquired from the power receiving device 20 corresponds to.

  In step S201, it is determined whether or not the charging information acquired from the power receiving device 20 is charging information CA. In step S202, it is determined whether the charging information acquired from the power receiving device 20 is the charging information CB. In step S203, it is determined whether or not the charging information acquired from the power receiving device 20 is the charging information CD.

Then, any one of the following processes (A) to (D) is performed according to the result of each determination.
(A) When an affirmative determination is made in step S201, that is, when it is determined that the charging information acquired from the power receiving device 20 is the charging information CA, the fourth usage pattern is selected as the coil usage pattern in step S214.

  (B) When a negative determination is made in step S201 and an affirmative determination is made in step S202, that is, when it is determined that the charging information acquired from the power receiving device 20 is the charging information CB, the third usage pattern is set as the coil usage pattern in step S213. select.

  (C) When a negative determination is made in steps S201 and S202 and an affirmative determination is made in step S203, that is, when it is determined that the charging information acquired from the power receiving device 20 is the charging information CC, the second usage is used as the coil usage pattern in step S212. Select the form.

  (D) When a negative determination is made in steps S201 to S203, that is, when it is determined that the charging information acquired from the power receiving device 20 is the charging information CD, the first usage pattern is selected as the coil usage pattern in step S211.

(Effect of embodiment)
According to the contactless power supply device 1 of the present embodiment, the following effects can be obtained.
(1) In the non-contact power feeding device 1, the phase of the current supplied to the eleventh coil 31A and the phase of the current supplied to the twelfth coil 31B and the fourteenth coil 31D adjacent to the coil 31A are mutually Different.

  According to this structure, it is suppressed that a mutual magnetic flux cancels between adjacent primary side coils. For this reason, it can suppress that the transmission efficiency of the electric power from the power transmission apparatus 10 to the power receiving apparatus 20 falls.

  (2) In the non-contact power feeding device 1, the difference between the phase of the current supplied to the eleventh coil 31A and the phase of the current supplied to the twelfth coil 31B and the fourteenth coil 31D adjacent to the coil 31A. Is larger than “90 °” and smaller than “270 °”.

  According to this configuration, it has been confirmed from the test results conducted by the inventors of the present application that the power transmission efficiency is higher than in the case where the phase difference is “90 °” or less or “270 °” or more. Yes. For this reason, the effect that the transmission efficiency of the electric power from the power transmission apparatus 10 to the power receiving apparatus 20 falls is heightened more.

  (3) In the non-contact power feeding device 1, the difference between the phase of the current supplied to the eleventh coil 31A and the phase of the current supplied to the twelfth coil 31B and the fourteenth coil 31D adjacent to the coil 31A. Is set to “180 °”.

  According to this configuration, compared with the case where the phase difference is larger than “90 °” and smaller than “180 °” and larger than “180 °” and smaller than “270 °”, It has been confirmed from the test results carried out by the inventors of the present application that the transmission efficiency of the network becomes higher. For this reason, the effect that the transmission efficiency of the electric power from the power transmission apparatus 10 to the power receiving apparatus 20 falls is heightened more.

  (4) In the non-contact power feeding device 1, the difference between the phase of the current supplied to the eleventh coil 31A and the phase of the current supplied to the thirteenth coil 31C facing the coil 31A is the eleventh coil. The difference between the phase of the current supplied to 31A and the phase of the current supplied to the twelfth coil 31B and the fourteenth coil 31D is smaller.

  According to this configuration, it is confirmed from the test results conducted by the inventors of the present application that the power transmission efficiency is higher than that in the case where the former phase difference is larger than the latter phase difference. For this reason, the effect that the transmission efficiency of the electric power from the power transmission apparatus 10 to the power receiving apparatus 20 falls is heightened more.

  (5) In the non-contact power supply device 1, the difference between the phase of the current supplied to the eleventh coil 31A and the phase of the current supplied to the thirteenth coil 31C facing the coil 31A is “0 °”. Is set to

  According to this configuration, it has been confirmed from the test results conducted by the inventors of the present application that the power transmission efficiency is higher than in the case where the phase difference is larger than “0 °”. For this reason, the effect that the transmission efficiency of the electric power from the power transmission apparatus 10 to the power receiving apparatus 20 falls is heightened more.

  (6) In the non-contact power supply device 1, the four primary coils 31 are arranged on the magnetic sheet 32 of the power transmission device 10. According to this configuration, leakage of magnetic flux between each primary coil 31 and each secondary coil 41 can be reduced. That is, the transmission efficiency of power from the power transmission device 10 to the power reception device 20 can be increased.

  (7) In the non-contact power supply device 1, the magnetic sheet 32 is arranged between the adjacent primary coils 31 in addition to the portion corresponding to the bottom surface of each primary coil 31 of the power transmission device 10. Yes. According to this configuration, leakage of magnetic flux between each primary coil 31 and each secondary coil 41 can be further reduced.

  (8) In the non-contact power supply device 1, the four secondary coils 41 are arranged on the magnetic sheet 42 of the power receiving device 20. According to this configuration, leakage of magnetic flux between each primary coil 31 and each secondary coil 41 can be reduced. That is, the transmission efficiency of power from the power transmission device 10 to the power reception device 20 can be increased.

  (9) In the non-contact power feeding device 1, the magnetic sheet 42 is disposed between the adjacent secondary coils 41 in addition to the portion corresponding to the bottom surface of each secondary coil 41 of the power receiving device 20. Yes. According to this configuration, leakage of magnetic flux between each primary coil 31 and each secondary coil 41 can be further reduced.

  (10) In the non-contact power supply device 1, the usage mode of the primary coil module 30 is selected based on the battery information of the secondary battery 22. According to this configuration, the current supplied to the primary coil module 30 when the charging current value AX is within a range suitable for charging the secondary battery 22 during charging of the secondary battery 22 according to the selected coil usage pattern. Can be maintained at the resonant frequency. For this reason, the transmission efficiency of the electric power from the power transmission apparatus 10 to the power receiving apparatus 20 is improved.

  (11) In the non-contact power supply device 1, the usage mode of the primary coil module 30 is selected based on the charging information of the secondary battery 22. According to this configuration, the current supplied to the primary coil module 30 when the charging current value AX is within a range suitable for charging the secondary battery 22 during charging of the secondary battery 22 according to the selected coil usage pattern. Can be maintained at the resonant frequency. For this reason, the transmission efficiency of the electric power from the power transmission apparatus 10 to the power receiving apparatus 20 is improved.

(Other embodiments)
The embodiment of the present invention is not limited to the contents of the above embodiment, and can be modified as follows, for example. Further, the following modified examples are not applied only to the above embodiment, and different modified examples can be implemented in combination with each other.

In the above embodiment, at least one of the following conditions (A) to (F) may be used as the magnitudes of the first phase difference FD1 to the sixth phase difference FD6. Here, conditions that can be changed are listed by omitting the signs of the respective phase differences.
(A) The first phase difference is set in a range larger than “0 °” and smaller than “180 °”.
(B) The second phase difference is set in a range larger than “0 °” and not larger than “180 °”.
(C) The third phase difference is set in a range larger than “0 °” and smaller than “180 °”.
(D) The fourth phase difference is set in a range greater than “0 °” and less than or equal to “180 °”.
(E) The fifth phase difference is set in a range larger than “0 °” and smaller than “180 °”.
(F) The sixth phase difference is set in a range larger than “0 °” and smaller than “180 °”.

In the above embodiment, the mutual relationship between the first phase difference FD1, the third phase difference FD3, the fifth phase difference FD5, and the sixth phase difference FD6 can be changed as follows. Here, conditions that can be changed are listed by omitting the signs of the respective phase differences.
(A) The first or third phase difference is maximized.
(B) The first or third phase difference is minimized.
(C) The first and third phase differences are made larger than the fifth and sixth phase differences.
(D) The first and third phase differences are made smaller than the fifth and sixth phase differences.
(E) In (C) above, the first phase difference is made larger than the third phase difference.
(F) In said (C), a 1st phase difference is made smaller than a 3rd phase difference.
(G) In (D) above, the first phase difference is made larger than the third phase difference.
(H) In (D) above, the first phase difference is made smaller than the third phase difference.

  In the above embodiment, the second phase difference FD2 can be larger or smaller than the fourth phase difference FD4. In addition, under these conditions, the conditions (A) to (H) for the first phase difference FD1, the third phase difference FD3, the fifth phase difference FD5, and the sixth phase difference FD6 can be combined.

  In the above embodiment, four primary coils 31 are arranged on one magnetic sheet 32 in the primary coil module 30, but the structure of the primary coil module 30 is as follows (A) to ( It can be changed to any one of C). Note that the modified examples (A) to (C) can be applied to the secondary coil module 40.

  (A) As shown in FIG. 7, the primary coil module 30 is provided with one pot core 70 for arranging the four primary coils 31 together. The pot core 70 is provided with four accommodating portions 72 for arranging the primary coils 31 and a rectangular main body 71 that supports the four accommodating portions 72. The pot core 70 corresponds to a “magnetic body”.

  (B) As shown in FIG. 8, the primary coil module 30 is provided with four pot cores 80 for individually arranging the four primary coils 31. Each pot core 80 has a bottom wall 81 on which the primary coil 31 is placed, an inner wall 82 inserted into a hollow portion of the primary coil 31, and the primary coil 31 in the radial direction of the primary coil 31. A surrounding outer wall 83 is provided. The pot core 80 corresponds to a “magnetic body”.

  (C) As shown in FIG. 9, the primary coil module 30 is provided with four magnetic sheets 90 for arranging the four primary coils 31 individually. The magnetic sheets 90 are arranged in a state of being separated from each other. The magnetic sheet 90 corresponds to a “magnetic body”.

In the modification shown in FIG. 8, at least two pot cores 80 can be connected to each other to form a single pot core.
In the modification shown in FIG. 9, at least two of the magnetic sheets 90 can be connected to each other to form one magnetic sheet.

-In the said embodiment, the relationship of the outer diameter of each primary side coil 31 can also be changed as follows. Here, the outer diameter of the eleventh coil 31A is “first outer diameter”, the outer diameter of the twelfth coil 31B is “second outer diameter”, and the outer diameter of the thirteenth coil 31C is “third outer diameter”. The outer diameter of the fourteenth coil 31D is “fourth outer diameter”. The following relationship can be applied to each secondary coil 41.
(A) The first or third outer diameter is maximized.
(B) The first or third outer diameter is minimized.
(C) The first and third outer diameters are made larger than the second and fourth outer diameters.
(D) The first and third outer diameters are made smaller than the second and fourth outer diameters.
(E) In said (C), a 1st outer diameter is made larger than a 3rd outer diameter.
(F) In said (C), a 1st outer diameter is made smaller than a 3rd outer diameter.
(G) In said (D), a 1st outer diameter is made larger than a 3rd outer diameter.
(H) In (D) above, the first outer diameter is made smaller than the third outer diameter.

In the above embodiment, the relationship of the number of turns of each primary coil 31 can be changed as follows. Here, the number of turns of the eleventh coil 31A is “first number of turns”, the number of turns of the twelfth coil 31B is “second number of turns”, and the number of turns of the thirteenth coil 31C is “third number of turns”. The number of turns of the fourteenth coil 31D is “fourth number of turns”. The following relationship can also be applied to each secondary coil 41.
(A) The first or third turn number is maximized.
(B) The first or third turn number is minimized.
(C) The first and third turn numbers are made larger than the second and fourth turn numbers.
(D) The first and third turn numbers are made smaller than the second and fourth turn numbers.
(E) In (C) above, the first turn number is made larger than the third turn number.
(F) In (C), the first turn number is made smaller than the third turn number.
(G) In the above (D), the first turn number is made larger than the third turn number.
(H) In (D), the first turn number is made smaller than the third turn number.

In the above embodiment, four primary coils 31 are provided in the primary coil module 30, but the number of primary coils 31 provided in the primary coil module 30 is changed as follows. You can also. When the number of primary side coils 31 is changed, the number of secondary side coils 41 of the secondary side coil module 40 is changed according to the number of primary side coils 31.
(A) Two primary coils 31 are provided.
(B) Three primary coils 31 are provided.
(C) Five or more primary coils 31 are provided.

  In the above embodiment, the magnetic sheet 32 and the magnetic sheet 42 formed of an amorphous material are used. However, at least one of the sheets 32 and 42 can be changed to a magnetic sheet formed of another material. Examples of other materials include ferrite materials and iron materials.

  In the above embodiment, the eleventh center line C11 to the fourteenth center line C14 of each primary coil 31 are arranged on the first reference plane so as to form a square apex, respectively. The arrangement | positioning aspect of line C11-14th centerline C14 is not limited to this. For example, on the first reference plane, the line connecting the eleventh center line C11 to the fourteenth center line C14 may be arranged to form a straight line. In this case, the 21st center line C21 to the 24th center line C24 of each secondary coil 41 are similarly arranged so that the line connecting the 21st center line C21 to the 24th center line C24 forms a straight line. The

  -In the said embodiment, although the coil usage pattern is selected according to battery information VA-VD, the change conditions of a coil usage pattern are not restricted to this. For example, the test current is supplied to any one of the primary side coils 31 </ b> A to 31 </ b> D before the charging of the power receiving device 20, and the coil according to the magnitude of the charging current value AX obtained by the secondary side circuit 60 accordingly. The usage form can also be selected.

  -In the said embodiment, although the coil usage pattern is selected according to charge information CA-CD, the change conditions of a coil usage pattern are not restricted to this. For example, a test current is supplied to any one of the primary side coils 31 </ b> A to 31 </ b> D during charging of the power receiving device 20, and the coil is used according to the magnitude of the charging current value AX obtained by the secondary side circuit 60 accordingly. A form can also be selected.

  -In above-mentioned embodiment, change control at the time of charge can also be abbreviate | omitted. In this case, the coil usage mode set by the coil selection control is maintained until the authentication completion flag FK is set to OFF or until the charging stop signal KS is received from the power receiving device 20.

-In the above-mentioned embodiment, although the structure which performs frequency control at the time of charge is employ | adopted, the control can also be abbreviate | omitted.
In the above embodiment, at least one of a smartphone, a portable information terminal, a portable audio player, an IC recorder, a digital camera, an electric toothbrush, and a shaver is used as a power receiving device, and power transmission is performed so that the power receiving device can be mounted. An apparatus can also be constructed.

  DESCRIPTION OF SYMBOLS 1 ... Non-contact-type electric power feeder, 10 ... Power transmission apparatus, 20 ... Power receiving apparatus, 31 ... Primary side coil, 32 ... Magnetic sheet (magnetic body), 41 ... Secondary side coil, 42 ... Magnetic sheet (magnetic body), 70: Pot core (magnetic body), 80: Pot core (magnetic body), 90: Magnetic sheet (magnetic body).

Claims (13)

A power transmitting device including a primary coil A1 and a primary coil A2 as a plurality of primary coils, and a power receiving device including a secondary coil B1 and a secondary coil B2 as a plurality of secondary coils. In the non-contact type power feeding device that is provided and that is provided with the condition that an alternating magnetic flux is generated by supplying power to at least one of the primary side coil A1 and the primary side coil A2,
The non-contact type power feeding device, wherein a phase of a current supplied to the primary side coil A1 and a phase of a current supplied to the primary side coil A2 are different from each other. The contactless power supply device according to claim 1,
The difference between the phase of the current supplied to the primary coil A1 and the phase of the current supplied to the primary coil A2 is larger than “90 °” and smaller than “270 °”. Non-contact type power supply device. The contactless power supply device according to claim 2,
The non-contact type power feeding device, wherein a difference between a phase of a current supplied to the primary side coil A1 and a phase of a current supplied to the primary side coil A2 is "180 °". In the non-contact-type electric power feeder as described in any one of Claims 1-3,
As the plurality of primary side coils, in addition to the primary side coil A1 and the primary side coil A2, a primary side coil A3 is provided in the power transmission device,
The distance between the primary coil A1 and the primary coil A2 is the inter-coil distance LA, and the distance between the primary coil A2 and the primary coil A3 is the inter-coil distance LB. LA is smaller than the distance LB between the coils,
The difference between the phase of the current supplied to the primary side coil A1 and the phase of the current supplied to the primary side coil A2 is defined as a first phase difference, and the current supplied to the primary side coil A1. And the phase of the current supplied to the primary side coil A3 is a second phase difference, the first phase difference is larger than the second phase difference. Power supply device. In the non-contact-type electric power feeder of Claim 4,
In addition to the primary coil A1, the primary coil A2, and the primary coil A3, a primary coil A4 is provided in the power transmission device as the plurality of primary coils.
The diameters of the plurality of primary coils are the same as each other;
The center line of the primary coil A1 is a first center line, the center line of the primary coil A2 is a second center line, the center line of the primary coil A3 is a third center line, The plurality of primary sides such that the first center line, the second center line, the third center line, and the fourth center line are parallel to each other with the center line of the secondary coil A4 as a fourth center line. Each of the coils is placed,
A plane perpendicular to the center line of the plurality of primary coils is used as a reference plane, and the first center line, the second center line, the third center line, and the fourth center line are square on the reference plane. Forming the vertices of
In the square, the first center line and the third center line are diagonally located;
When the difference between the phase of the current supplied to the primary side coil A1 and the phase of the current supplied to the primary side coil A4 is a third phase difference, the first phase difference and the third phase difference A non-contact power feeding device, wherein a phase difference is larger than the second phase difference. The contactless power supply device according to claim 5,
The non-contact type power feeding device, wherein the first phase difference and the third phase difference have the same magnitude. In the non-contact-type electric power feeder of Claim 5 or 6,
The contactless power feeding device, wherein the first phase difference and the third phase difference are larger than “90 °” and smaller than “270 °”. The contactless power supply device according to claim 7,
The non-contact type power feeding device, wherein the first phase difference and the third phase difference are “180 °”. In the non-contact-type electric power feeder as described in any one of Claims 4-8,
The non-contact power feeding device, wherein the second phase difference is “0 °”. In the non-contact-type electric power feeder as described in any one of Claims 1-9,
A magnetic body is provided in each of the plurality of primary coils;
In addition, the non-contact type power feeding device, wherein the magnetic bodies of the plurality of primary side coils are independent from each other. In the non-contact-type electric power feeder as described in any one of Claims 1-9,
A non-contact power supply device, wherein a magnetic body that covers at least two of the plurality of primary coils is provided. In the non-contact-type electric power feeder as described in any one of Claims 1-11,
The contactless power feeding device, wherein a usage pattern of the plurality of primary coils is changed according to a signal transmitted from the power receiving device to the power transmitting device. In the non-contact-type electric power feeder as described in any one of Claims 1-12,
The non-contact type power feeding device, wherein a usage pattern of the plurality of primary side coils is changed according to a charging state of the power receiving device.

Images