JP2014103147A - Collective wires, power transmission device using the same, electronic apparatus and wireless power transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the power transmission efficiency even when the transmission distance between a power transmission coil and a power receiving coil is set to be large to avoid the skin effect and the proximity effect, or an axial misalignment occurs between the power transmission coil and the power receiving coil.SOLUTION: A collective cable 51 has plural wires 81 covered with an insulating layer including: a first flux-wire 82 of plural wires twisted in a right-twisting direction or a left-twisting direction; and a second flux-wire 83 of plural wires which are twisted in a right-twisting direction or a left-twisting direction. A collective cable 51 is constituted of the first flux-wire and the second flux-wire which are twisted in a right-twisting direction or a left-twisting direction.

Description

  The present invention relates to a collective wire used for wireless power transmission in which power is transmitted wirelessly from a power transmission device to an electronic device for use such as charging a secondary battery mounted on the electronic device, a power transmission device using the same, and an electronic device The present invention relates to a device and a wireless power transmission system.

  In an electronic device equipped with a secondary battery such as a mobile phone, in order to charge the secondary battery, the electronic device and the charger are electrically connected via respective terminals, and the charger is changed to the electronic device. Generally, power is supplied, but a power transmission device and an electronic device are provided with coils for power transmission and power reception, respectively, and power is transmitted wirelessly from the power transmission device to the electronic device by an electromagnetic induction method. Techniques are known (Patent Documents 1 to 3). According to this, since the terminals for electrical connection are not exposed, it is easy to ensure waterproofness, there is no need to consider the problem of poor contact and deterioration, and the power transmission device and the electronic device are attached and detached. It is possible to obtain advantages such as being easily performed.

  In addition, with respect to electric wires used in electromagnetic devices (switching transformers), a braided wire technique is known in which strands are knitted so that the relative position of the strands with respect to the center line changes (Patent Document 4).

JP 2006-42519 A JP 2010-16235 A JP 2008-172873 A JP 7-272948 A

  In a wireless power transmission system, a high-frequency current (several tens to hundreds of kHz) is used to reduce the size of the coil. When such a high-frequency current is passed through a conductor, the current density is high on the surface of the conductor. Therefore, due to the effect of the so-called skin effect, which decreases as the distance from the surface increases, the effective resistance increases, the power loss increases, and the power transmission efficiency decreases.

  Conventionally, as disclosed in Patent Documents 1 to 3 described above, a coil is formed by winding a collective electric wire obtained by twisting a plurality of insulated wires, so-called litz wires, as disclosed in Patent Documents 1 to 3 above. I have to. In such a litz wire, since the total surface area of the conductor is increased, an increase in effective resistance in a high frequency region can be suppressed, and power transmission efficiency can be increased.

  However, since the litz wire is simply a plurality of insulated wires twisted together, the currents flowing through the insulated wires are in substantially the same direction. For this reason, there is a tendency that a so-called proximity effect that inhibits the current is likely to appear due to the magnetic fields generated by the current flowing through the adjacent insulated wires mutually affecting each other. This proximity effect is a factor that increases power loss and decreases power transmission efficiency. Particularly in high-power wireless power transmission of about 10 W or more, when the transmission distance between the power transmission coil and the power reception coil becomes large, In addition, there is a problem in that the power transmission efficiency is significantly reduced when there is an axis deviation between the power receiving coil and the power receiving coil.

  In addition, as disclosed in Patent Document 4 described above, in the configuration in which the strands are knitted so that the relative position of the strands with respect to the center line changes, a portion where the strands intersect is generated and flows through each strand. Although the direction of the current is different, the effect of suppressing the effect of the proximity effect can be obtained, but there are many portions where each strand is in contact with each other in parallel, and the direction of the current flowing through each strand is not significantly different. There has been a problem that the influence of can not be sufficiently suppressed.

  The present invention has been devised to solve such problems of the prior art, and its main purpose is to sufficiently suppress the effects of the skin effect and the proximity effect, so that the power transmission coil and the power reception coil are connected to each other. Even when the transmission distance is increased, or even when there is a misalignment between the power transmission coil and the power reception coil, the assembled wire configured so that the power transmission efficiency does not greatly decrease, a power transmission device and an electronic device using the same, And providing a wireless power transmission system.

  The collective electric wire of the present invention is a collective electric wire having a plurality of strands coated with an insulating layer, and the first bundle in which the plural strands are twisted in either one of the right twist and the left twist. And a second bundle wire in which a plurality of the strands are twisted in the other twist direction of either the right twist or the left twist, and the first bundle wire and the second bundle wire are , And a twisted structure in either the right twist or the left twist.

  Moreover, the power transmission device of the present invention is a power transmission device that wirelessly transmits electric power to an electronic device by electromagnetic induction, and includes a power transmission coil formed by winding the collective wire.

  Moreover, the electronic device of the present invention is an electronic device in which power is transmitted wirelessly from a power transmission device by electromagnetic induction, and has a configuration including a power receiving coil formed by winding the collective wire.

  The wireless power transmission system of the present invention is a wireless power transmission system that wirelessly transmits power from a power transmission device to an electronic device, wherein the power transmission device includes a power transmission coil, and the electronic device includes a power reception coil. In addition, at least one of the power transmission coil and the power reception coil is formed by a collective electric wire having a plurality of strands coated with an insulating layer, and the collective wire is either one of a right twist and a left twist of the plurality of strands. A first bundle wire that is twisted in the twist direction of the second wire, and a second bundle wire that is twisted in the twist direction of either the right twist or the left twist of the plurality of strands, the first bundle The bundled wire and the second bundled wire are twisted together in either the right-handed twist or the left-handed twisted direction.

  According to the present invention, since the plurality of strands are assembled, the influence of the skin effect can be suppressed, and the stranding directions of the strands are reversed between the first bundle and the second bundle. As a result, the direction of the current flowing through each strand becomes different as a whole between the first bundle and the second bundle, so that the influence of the proximity effect can be suppressed. As a result, power loss can be suppressed and power transmission efficiency can be increased. Even when the transmission distance between the power transmission coil and the power reception coil is increased or when there is a misalignment between the power transmission coil and the power reception coil, the power transmission efficiency is improved. A large drop can be avoided.

Overall configuration diagram of a wireless power transmission system according to the present embodiment The top view which shows the power transmission coil 5 of the power transmission apparatus 1 Sectional drawing of the power transmission apparatus 1 and the electronic device 2 to which the coil structure shown in FIG. 2 was applied The top view which shows another coil structure of the power transmission apparatus 1 Sectional drawing of the power transmission apparatus 1 and the electronic device 2 to which the coil structure shown in FIG. 4 was applied Schematic side view showing the collecting wire 51 The typical side view explaining the point of manufacture of the 1st bundled wire 82 and the 2nd bundled wire 83 Schematic side view explaining the point of manufacture of the collecting wire 51 The side view explaining the twist angle of the strand 81 in the bundle wires 82 and 83 and the twist angle of the bundle wires 82 and 83 in the collective wire 51 Explanatory drawing explaining the apparatus which manufactures the 1st bundled wire 82 FIG. 8 is a schematic cross-sectional view showing the assembled wire 51 shown in FIG. 8 and its modifications.

  1st invention made | formed in order to solve the said subject is an assembly electric wire which has two or more strands by which the insulating layer was coat | covered, Comprising: The said strands are twisted in any one of right twist and left twist A first bundle wire that has been twisted together, and a second bundle wire in which a plurality of the strands are twisted in the other twist direction of either the right twist or the left twist, and the first bundle wire, The second bundle wire is configured to be twisted in either the right twist or the left twist.

  According to this, since a plurality of strands are assembled, the influence of the skin effect can be suppressed, and further, the stranding directions of the strands are reversed between the first bundled wire and the second bundled wire. Therefore, since the direction of the current flowing through each strand is different as a whole between the first bundle and the second bundle, the influence of the proximity effect can be suppressed. As a result, power loss can be suppressed and power transmission efficiency can be increased. Even when the transmission distance between the power transmission coil and the power reception coil is increased or when there is a misalignment between the power transmission coil and the power reception coil, the power transmission efficiency is improved. A large drop can be avoided.

  Further, the second invention includes a plurality of the first bundle wires and the second bundle wires, respectively, and the first bundle wires and the second bundle wires are twisted in a state of being alternately arranged. A combined configuration is used.

  According to this, since the first bundle wire and the second bundle wire in which the stranding directions of the strands are opposite to each other are adjacent to each other, the influence of the proximity effect can be further suppressed.

  Moreover, 3rd invention is set as the structure provided with the same number of said 1st bundled wires and said 2nd bundled wires.

  According to this, the first bundle line and the second bundle line are always adjacent to each other, and the first bundle line or the second bundle line is not adjacent to each other. Further suppression can be achieved.

  When the number of bundles increases, the first bundle lines and the second bundle lines cannot be alternately arranged, and the first bundle lines or the second bundle lines may be adjacent to each other. However, since the ratio at which the first bundle line and the second bundle line are adjacent to each other can be lowered, the influence of the proximity effect can be suppressed.

  Moreover, 4th invention sets it as the structure whose sum of the twist angle of the said strand in the said 1st bundle wire and the twist angle of the said strand in the said 2nd bundle wire is about 90 degree | times.

  According to this, since the strands of the first bundled wire and the strands of the second bundled wire are substantially orthogonal in a side view, the influence of the proximity effect can be suppressed to the maximum.

  Moreover, 5th invention sets it as the structure by which the twist angle of the said strand in the said 1st bundle wire and the twist angle of the said strand in the said 2nd bundle wire are substantially equal.

  According to this, since the total lengths of the strands of the first bundle line and the second bundle line are substantially equal, the resistance value and the inductance are substantially equal between the first bundle line and the second bundle line. Thus, matching with the power transmission circuit and the power reception circuit is facilitated, and the power transmission efficiency can be further enhanced.

  According to a sixth aspect of the present invention, there is provided a power transmission device that wirelessly transmits electric power to an electronic device by electromagnetic induction, and includes a power transmission coil formed by winding the collective electric wire.

  According to this, as in the first invention, the influence of the skin effect and the proximity effect is sufficiently suppressed to increase the transmission distance between the power transmission coil and the power reception coil, or there is an axial deviation between the power transmission coil and the power reception coil. Even in some cases, it is possible to avoid a significant decrease in power transmission efficiency.

  The seventh aspect of the invention further includes a parasitic coil disposed substantially concentrically with the power transmission coil with a predetermined gap, and a resonance capacitor connected to both ends of the parasitic coil; To do.

  According to this, by interposing a parasitic coil between the power transmission coil and the power reception coil, it is possible to suppress the Q value from being lowered due to the influence of the circuit impedance, and it is possible to suppress the reflection of power. In addition, since the parasitic coil and the power transmission coil are arranged substantially concentrically, the parasitic coil and the power transmission coil are efficiently magnetically coupled, and the power transmission efficiency can be further enhanced. In addition, it is good for the parasitic coil to use the collective electric wire of the said structure similarly to a power transmission coil.

  In this case, the number of turns of the power transmission coil is set to be smaller than the number of turns of the parasitic coil. For example, the parasitic coil is configured to be wound a plurality of times while the power transmission coil is configured to be wound once. Thereby, electric power transmission efficiency can be improved further.

  The eighth invention is an electronic device in which power is transmitted wirelessly from a power transmission device by electromagnetic induction, and includes a power receiving coil formed by winding the collective wire.

  According to this, as in the first invention, the influence of the skin effect and the proximity effect is sufficiently suppressed to increase the transmission distance between the power transmission coil and the power reception coil, or there is an axial deviation between the power transmission coil and the power reception coil. Even in some cases, it is possible to avoid a significant decrease in power transmission efficiency.

  The ninth aspect of the invention further includes a parasitic coil disposed substantially concentrically with the power receiving coil with a predetermined gap, and a resonant capacitor connected to both ends of the parasitic coil; To do.

  According to this, by interposing a parasitic coil between the power transmission coil and the power reception coil, it is possible to suppress the Q value from being lowered due to the influence of the circuit impedance, and it is possible to suppress the reflection of power. In addition, since the parasitic coil and the power receiving coil are arranged substantially concentrically, the parasitic coil and the power receiving coil are efficiently magnetically coupled, and the power transmission efficiency can be further improved. In addition, it is good to use the collective electric wire of the said structure also for a parasitic coil similarly to a receiving coil.

  In this case, the number of turns of the power receiving coil is set to be smaller than the number of turns of the non-feeding coil. Thereby, electric power transmission efficiency can be improved further.

  The tenth invention is a wireless power transmission system that wirelessly transmits power from a power transmission device to an electronic device, wherein the power transmission device includes a power transmission coil, the electronic device includes a power reception coil, and the power transmission At least one of the coil and the power receiving coil is formed by a collective electric wire having a plurality of strands coated with an insulating layer, and the collective wire is a twisted direction of either one of right-handed and left-handed strands. A first bundle wire that has been twisted together, and a second bundle wire in which a plurality of the strands are twisted in the other twist direction of either the right twist or the left twist, and the first bundle wire, The second bundle wire is configured to be twisted in either the right twist or the left twist.

  According to this, as in the first invention, the influence of the skin effect and the proximity effect is sufficiently suppressed to increase the transmission distance between the power transmission coil and the power reception coil, or there is an axial deviation between the power transmission coil and the power reception coil. Even in some cases, it is possible to avoid a significant decrease in power transmission efficiency.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an overall configuration diagram of a wireless power transmission system according to the present embodiment. This wireless power transmission system performs power transmission wirelessly (contactlessly) from a power transmission device 1 to an electronic device 2 such as a mobile phone, and the electronic device 2 operates to operate a component (not shown) that is mounted. And the secondary battery 3 is charged with the electric power sent from the power transmission device 1.

  In this wireless power transmission system, the power transmission device 1 includes a power transmission coil 5 and the electronic device 2 includes a power reception coil 6 in order to perform power transmission by electromagnetic induction. When AC power is supplied to the power transmission coil 5 of the power transmission device 1, the power transmission coil 5 is magnetically coupled to the power reception coil 6 of the electronic device 2, and an AC voltage is induced in the power reception coil 6, whereby AC power is transmitted. It is transmitted from the coil 5 to the power receiving coil 6.

  The power transmission device 1 includes an AC / DC converter 11, a power transmission control unit 12, and a power transmission circuit unit 13. The AC / DC converter 11 converts AC power supplied from a power source (commercial power source) 8 into DC power. The power transmission control unit 12 controls the operation of the power transmission circuit unit 13. The power transmission circuit unit 13 converts the DC power sent from the AC / DC converter 11 via the power transmission control unit 12 into an AC voltage having a predetermined frequency and supplies the AC voltage to the power transmission coil 5.

  The power transmission control unit 12 includes a control circuit 14, a voltage monitoring unit 15, and a temperature monitoring unit 16. The control circuit 14 controls the operation of the power transmission circuit unit 13. The voltage monitoring unit 15 monitors the voltage of AC power supplied from the power transmission circuit unit 13 to the power transmission coil 5. The temperature monitoring unit 16 monitors the temperature of the power transmission coil 5. When the voltage monitoring unit 15 and the temperature monitoring unit 16 detect an abnormality in voltage and temperature, power supply to the power transmission coil 5 is stopped.

  The power transmission circuit unit 13 includes a driver 17 and a resonance circuit 18. The driver 17 converts the DC power sent from the AC / DC converter 11 via the power transmission control unit 12 into an AC voltage having a predetermined frequency. The resonance circuit 18 constitutes a resonance circuit by an internal capacitor and the power transmission coil 5, and oscillates the power transmission coil 5 at a predetermined resonance frequency according to the AC voltage applied from the driver 17.

  The electronic device 2 includes a power reception circuit unit 21, a power reception control unit 22, and a charge control circuit 23. The power receiving circuit unit 21 converts the alternating current induced in the power receiving coil 6 by electromagnetic induction with the power transmitting coil 5 of the power transmitting device 1 into DC power having a predetermined voltage. The power reception control unit 22 controls the operation of the power reception circuit unit 21. The charging control circuit 23 charges the secondary battery 3 by supplying electric power sent from the power receiving circuit unit 21 via the power receiving control unit 22 to the secondary battery 3.

  The power receiving circuit unit 21 includes a rectifier circuit 24 and a regulator 25. The rectifier circuit 24 converts AC power induced in the power receiving coil 6 into DC power. The regulator 25 converts the DC power sent from the rectifier circuit 24 into a predetermined voltage suitable for charging the secondary battery 3.

  The power reception control unit 22 includes a control circuit 26 and a voltage monitoring unit 27. The control circuit 26 controls the operation of the power receiving circuit unit 21. The control circuit 26 controls the operation of the power receiving circuit unit 21. The voltage monitoring unit 27 monitors the voltage of AC power induced in the power receiving coil 6. In addition, the power reception control unit 22 monitors the state of the device mounted on the electronic device 2, for example, the temperature of the power reception coil 6, the charging state of the secondary battery 3, and the power reception operation when an abnormality is detected. To stop.

  In the present embodiment, the power transmission device 1 is provided with an electronic device detection unit 31 that detects that the electronic device 2 is placed on the electronic device placement surface. Based on the detection result of the electronic device detection unit 31, the power transmission operation of the power transmission device 1 is controlled. That is, when the electronic device 2 is placed on the electronic device placement surface, supply of AC power to the power transmission coil 5 is started, and when the electronic device 2 leaves the power transmission device 1, AC power to the power transmission coil 5 is started. Stop supplying.

  In the electronic device detection unit 31, the fluctuation of the voltage value (or current value) generated in the power transmission coil 5 due to the load impedance changing due to the power receiving coil 6 of the electronic device 2 being close to the power transmission coil 5 of the power transmission device 1. Based on this, it is detected that the electronic device 2 is placed on the electronic device placement surface. At this time, the amount of change in the voltage value (or current value) of the power transmission coil 5 is compared with a preset threshold value to determine whether or not the electronic device 2 is placed on the electronic device placement surface. Just do it.

  In the present embodiment, the electronic device 2 is also provided with a power transmission device detection unit 41 that detects that the electronic device 2 is placed on the electronic device placement surface of the power transmission device 1. Based on the detection result of the power transmission device detection unit 41, the power receiving operation of the electronic device 2 is controlled.

  In the power transmission device detection unit 41, the fluctuation of the voltage value (or current value) generated in the power reception coil 6 due to a change in load impedance caused by the power reception coil 6 of the electronic device 2 approaching the power transmission coil 5 of the power transmission device 1. Based on this, it is detected that the electronic device 2 is placed on the electronic device placement surface. At this time, the fluctuation amount of the voltage value (or current value) of the power receiving coil 6 is compared with a preset threshold value to determine whether or not the electronic device 2 is placed on the electronic device placement surface. Just do it.

  Moreover, in this embodiment, the power transmission apparatus 1 and the electronic device 2 are each provided with the information transmission / reception parts 32 and 42, and between a power transmission apparatus 1 and the electronic device 2 via a power transmission coil 5 and the power receiving coil 6, required. Information transmission for transmitting and receiving information can be performed. Note that this information transmission may be simple bit communication or coded communication.

  The information transmission / reception units 32 and 42 of the power transmission device 1 and the electronic device 2 have modulation / demodulation circuits 33 and 43 that perform modulation / demodulation of signals including information, respectively. In the modulation / demodulation circuits 33 and 43, the modulation signal generated by the transmission / reception modulation circuits 33 and 43 is sent to the transmission destination via the power transmission coil 5 and the power reception coil 6, and at the transmission destination, the power transmission coil 5 or the power reception coil 6. The modulation signal extracted from the output is demodulated by the modem circuits 33 and 43 to obtain transmission information.

  Here, when transmitting information from the power transmission device 1 to the electronic device 2, the modulation signal output from the information transmission / reception unit 32 is superimposed on the AC signal for power transmission by the power transmission circuit unit 13, thereby simultaneously transmitting information. You can send. Further, information transmission may be performed when power transmission is not performed. The power receiving circuit unit 21 of the electronic device 2 includes an information transmission driver and a resonance circuit (not shown), and drives these to transmit a modulation signal output from the information transmission / reception unit 42 to the power transmission device 1. To do.

  Here, the information exchanged between the power transmission device 1 and the electronic device 2 is state information regarding the states of the power transmission device 1 and the electronic device 2. As the state information, for example, during charging of the secondary battery 3, information on the charging state of the secondary battery 3 is transmitted from the electronic device 2 to the power transmission device 1, and power transmission is continued when the secondary battery 3 needs to be charged. When the charging of the secondary battery 3 is completed, the power transmission is stopped. Further, as status information, information such as temperature and voltage is exchanged between the power transmission device 1 and the electronic device 2, and control is performed to stop power transmission even when the status information indicates an abnormality.

  In the present embodiment, the power transmission device 1 and the electronic device 2 include authentication units 34 and 44, respectively, and mutual authentication is performed between the power transmission device 1 and the electronic device 2. In the power transmission device 1 and the electronic device 2, authentication information such as identification information of the power transmission device 1 and the electronic device 2 used for mutual authentication is exchanged by the information transmission / reception units 32 and 42 included in each, and based on this authentication information Authentication units 34 and 44 authenticate each other.

  This mutual authentication is performed when power transmission from the power transmission device 1 to the electronic device 2 is started. That is, when the power transmission device 1 and the electronic device 2 detect that the electronic device 2 is placed on the electronic device placement surface of the power transmission device 1, identification information is exchanged between the power transmission device 1 and the electronic device 2. And authenticate each other. When this mutual authentication is successful, power transmission from the power transmission device 1 to the electronic device 2 is started. When mutual authentication fails, power transmission is not performed.

  Next, the power transmission coil 5 of the power transmission device 1 and the power reception coil 6 of the electronic device 2 will be described. FIG. 2 is a plan view showing the power transmission coil 5 of the power transmission device 1. FIG. 3 is a cross-sectional view of the power transmission device 1 and the electronic device 2 to which the coil configuration shown in FIG. 2 is applied.

  As shown in FIG. 2, the power transmission coil 5 is a planar coil formed by winding a collective electric wire 51 in which a plurality of insulated electric wires each having a linear conductor covered with an insulating layer are gathered into a substantially circular spiral shape. is there. Terminals 52 at both ends of the power transmission coil 5 are connected to the power transmission circuit unit 13 (see FIG. 1).

  As shown in FIG. 3, the power transmission coil 5 is disposed so as to be in contact with the inner surface of the housing 53 of the power transmission device 1, and covers the entire surface of the power transmission coil 5 on the side opposite to the surface in contact with the housing 53 of the power transmission coil 5. A magnetic sheet 54 is provided.

  Similarly to the power transmission coil 5 shown in FIG. 2, the power receiving coil 6 of the electronic device 2 has a collective electric wire 51 in which a plurality of insulated electric wires each having a linear conductor covered with an insulating layer are gathered into a substantially circular spiral shape. It is a planar coil formed by winding. Both ends of the power receiving coil 6 are electrically connected to the power receiving circuit unit 21 (see FIG. 1). The power receiving coil 6 is disposed in contact with the inner surface of the housing 55 of the electronic device 2, and a magnetic sheet 56 is provided on the side of the power receiving coil 6 opposite to the surface in contact with the housing 55 so as to cover the entire surface of the power receiving coil 6. It has been.

  In such a configuration, by placing the electronic device 2 on the electronic device placement surface 57 provided in the housing 53 of the power transmission device 1, the power transmission coil 5 and the power reception coil 6 are brought close to each other via the housings 53 and 55. Therefore, the magnetic flux generated from the power transmission coil 5 is linked to the power reception coil 6, the power transmission coil 5 and the power reception coil 6 are magnetically coupled, and AC power is transmitted from the power transmission coil 5 to the power reception coil 6.

  FIG. 4 is a plan view showing another coil configuration of the power transmission device 1. FIG. 5 is a cross-sectional view of the power transmission device 1 and the electronic device 2 to which the coil configuration shown in FIG. 4 is applied.

  Here, as shown in FIG. 4, the power transmission coil 61 and the parasitic coil 62 are arranged concentrically with a predetermined gap, and particularly here, the power transmission coil 61 is arranged to surround the parasitic coil 62. Has been.

  The parasitic coil 62 is a planar coil formed by winding the collecting wire 51 in a substantially circular spiral shape a plurality of times, similarly to the power transmission coil 5 shown in FIG. The power transmission coil 61 is also a planar coil formed by winding the collective electric wire 51 in a substantially circular shape. However, the number of turns of the power transmission coil 61 is smaller than the number of turns of the parasitic coil 62, and particularly here the power transmission coil 61 is configured to be wound once.

  The power transmission coil 61 and the parasitic coil 62 are disposed on the substrate 63 and are fixed to the substrate 63 by appropriate fixing means such as an adhesive. Terminals 64 at both ends of the power transmission coil 61 are connected to the power transmission circuit unit 13 (see FIG. 1). Both ends of the parasitic coil 62 are connected to the resonance capacitor 65.

  As shown in FIG. 5, the power transmission coil 61 and the parasitic coil 62 are arranged so that the side opposite to the substrate 63 is in contact with the inner surface of the housing 53 of the power transmission device 1. On the opposite side, a magnetic sheet 66 is provided so as to cover the entire surface of the power transmission coil 61 and the parasitic coil 62.

  The coil configuration on the electronic device 2 side is the same as the coil configuration on the power transmission device 1 side shown in FIG. 4, and the power receiving coil 67 is arranged concentrically with the parasitic coil 68 with a predetermined gap. Here, the power receiving coil 67 is disposed so as to surround the parasitic coil 68.

  The parasitic coil 68 is a planar coil formed by winding the collecting wire 51 into a substantially circular spiral shape a plurality of times, similarly to the parasitic coil 62 on the power transmission device 1 side shown in FIG. The power receiving coil 67 is also a planar coil formed by winding the collective electric wire 51 in a substantially circular shape. However, the number of turns of the power receiving coil 67 is smaller than the number of turns of the parasitic coil 68, and particularly here the power receiving coil. 67 is configured to be wound once.

  The power receiving coil 67 and the parasitic coil 68 are disposed on the substrate 69 and are fixed to the substrate 69 by appropriate fixing means such as an adhesive. Both ends of the parasitic coil 68 are connected to a resonance capacitor (not shown). Both ends of the power receiving coil 67 are connected to the power receiving circuit unit 21 (see FIG. 1).

  The power receiving coil 67 and the parasitic coil 68 are arranged so that the side opposite to the substrate 69 is in contact with the inner surface of the housing 55 of the electronic device 2, and the side opposite to the power receiving coil 67 and the parasitic coil 68 on the substrate 69 is arranged. Is provided with a magnetic sheet 70 so as to cover the entire surface of the power receiving coil 67 and the parasitic coil 68.

  In such a configuration, when an AC voltage is applied to the power transmission coil 61 of the power transmission device 1, the parasitic coil 62 resonates due to the magnetic flux generated from the power transmission coil 61. Then, the magnetic flux generated from the parasitic coil 62 is linked to the parasitic coil 68 on the electronic device 2 side, the parasitic coil 62 and the parasitic coil 68 are magnetically coupled, and the parasitic coil 68 resonates. The power receiving coil 67 is excited by the magnetic flux generated from the parasitic coil 68. Thereby, AC power is transmitted from the power transmission coil 61 on the power transmission device 1 side to the power reception coil 67 via the parasitic coil 62 and the parasitic coil 68 on the electronic device 2 side.

  Thus, by providing the non-feed coils 62 and 68 between the power transmission coil 61 and the power reception coil 67, it is possible to suppress the Q value from being lowered due to the influence of the circuit impedance, and also to suppress the reflection of power. The impedances of the parasitic coils 62 and 68 are set to appropriate values so that the Q value can be maintained high. Further, by ensuring a large coupling coefficient between the power transmission coil 61 and the parasitic coils 62 and 68 and a coupling coefficient between the parasitic coils 62 and 68 and the power reception coil 67, high power transmission efficiency can be realized.

  Further, in the power transmission device 1, when the parasitic coil 62 is disposed concentrically with the power transmission coil 61, the direction of current is reversed between the power transmission coil 61 and the parasitic coil 62, so that the magnetic flux generated from the power transmission coil 61 is generated. This acts to weaken the magnetic flux generated from the parasitic coil 62, but here, the number of turns of the power transmission coil 61 is made smaller than the number of turns of the parasitic coil 62, so that the magnetic flux of the parasitic coil 62 is weakened. Thus, power consumption can be kept low. Such an action is also the same in the power receiving coil 67 and the parasitic coil 68 of the electronic device 2.

  Next, the power transmission coil 5 and the power reception coil 6 shown in FIG. 3, the power transmission coil 61 and the parasitic coil 62 shown in FIG. 5, and the collective electric wire 51 constituting the power reception coil 67 and the parasitic coil 68 will be described.

  FIG. 6 is a schematic side view showing the collecting wire 51. FIG. 7 is a schematic side view for explaining the manufacturing procedure of the first bundled wire 82 and the second bundled wire 83. FIG. 8 is a schematic side view for explaining the manufacturing procedure of the collective wire 51.

  As shown in FIGS. 6 to 8, the collective electric wire 51 is a set of a plurality of strands (insulated electric wires) 81 covered with an insulating layer, and is right-handed (S-twisted) and left-handed (Z-twisted). A first bundle 82 in which a plurality of strands 81 are twisted together in any one of the twisting directions, and a second bundle in which a plurality of strands 81 are twisted in either one of the right twisting and left twisting The first bundle wire 82 and the second bundle wire 83 are twisted together in either the right twist or the left twist.

  In the assembled electric wire 51 configured as described above, since the plurality of strands 81 are assembled, the influence of the skin effect can be suppressed, and further, the first bundle 82 and the second bundle 83 are used as the strands. Since the twist directions of the wires 81 are opposite to each other, the direction of the current flowing through each of the strands 81 is different between the first bundle wire 82 and the second bundle wire 83 as a whole. Can be suppressed.

  Thereby, it is possible to suppress power loss and increase power transmission efficiency. When the transmission distance between the power transmission coils 5 and 61 and the power reception coils 6 and 67 is increased, the power transmission coils 5 and 61 and the power reception coils 6 and 67 Even when there is a shaft misalignment, it is possible to avoid a significant decrease in power transmission efficiency. Moreover, the effect which reduces the incidence rate of the disconnection in a manufacturing process is acquired by setting it as the structure which further twists the bundle wires 82 and 83 formed by twisting the strand 81. FIG.

  In addition, the collective electric wire 51 includes a plurality of first bundle wires 82 and second bundle wires 83, and the first bundle wires 82 and the second bundle wires 83 are twisted together in an alternately arranged state. ing. Thereby, since the 1st bundled wire 82 and the 2nd bundled wire 83 in which the twist direction of the strand 81 becomes mutually opposite are adjacent, the influence of a proximity effect can be suppressed further.

  The collective electric wire 51 includes the same number of first bundle wires 82 and second bundle wires 83. As a result, the first bundle 82 and the second bundle 83 are always adjacent to each other, and the first bundle 82 or the second bundle 83 is not adjacent to each other. The influence can be further suppressed.

  In addition, in this embodiment, as shown in FIGS. 6-8, the twist direction of the strand 81 is the left twist (Z twist) with the 1st bundle wire 82, and the right twist (S twist) with the 2nd bundle wire 83. However, the twist direction may be reversed. Further, the bundled wires 82 and 83 in the collective electric wire 51 may be twisted in either the right-handed or left-handed manner, but here, the right-handed strand is the same as the second bundled wire 83.

  In this embodiment, as shown in FIGS. 6 and 8, the collective electric wire 51 has a configuration in which two first bundle wires 82 and two second bundle wires 83 are twisted together. A configuration in which one bundle wire 82 and second bundle wire 83 are twisted one by one is also possible, and the number of first bundle wires 82 and second bundle wires 83 is increased. A configuration in which one bundle wire 82 and the second bundle wire 83 are twisted by 20 to 30 is also possible.

  Further, in the present embodiment, as shown in FIG. 7, the first bundle wire 82 and the second bundle wire 83 have a configuration in which four strands 81 are twisted together. The number of wires 81 may be two, and in order to increase the cross-sectional area of the bundle wires 82 and 83 and increase the magnetic strength generated from the coil, the wires 81 are thinned and twisted together. It is also possible to increase the number of lines 81, for example, about 20 to 30 lines.

  Next, the twist angle of the strand 81 in the bundle wires 82 and 83 and the twist angle of the bundle wires 82 and 83 in the assembled wire 51 will be described. FIG. 9 is a side view for explaining the twist angle of the strand 81 in the bundle wires 82 and 83 and the twist angle of the bundle wires 82 and 83 in the assembled wire 51.

  As shown in FIG. 7A, in the first bundle 82, the first twist angle (angle formed by the center line of the strand 81 and the center line of the first bundle 82 in a side view) A The strand 81 is twisted together. As shown in FIG. 7B, in the second bundle 83, the second twist angle (angle formed by the center line of the strand 81 and the center line of the second bundle 83 in a side view) B The strand 81 is twisted together.

  Here, in this embodiment, the sum (A + B) of the first twist angle A and the second twist angle B is approximately 90 degrees, and the first twist angle A and the second twist angle. B is substantially equal. That is, the first twist angle A and the second twist angle B are both about 45 degrees.

  As described above, when the sum (A + B) of the first twist angle A and the second twist angle B is approximately 90 degrees, as shown in FIG. Since the strands 81 and the strands 81 of the second bundle 83 are substantially orthogonal, the influence of the proximity effect can be suppressed to the maximum.

  Further, when the first twist angle A and the second twist angle B are substantially equal, the total length of the strands 81 is approximately equal between the first bundle 82 and the second bundle 83. Since the first bundle wire 82 and the second bundle wire 83 have substantially the same resistance value and inductance, matching with the power transmission circuit unit 13 and the power reception circuit unit 21 is facilitated, and the power transmission efficiency is further improved. be able to.

  In the present embodiment, the first twist angle A and the second twist angle B are set to approximately 45 degrees. However, the present invention is not limited to this, and can be set to an appropriate angle. A and B may be in the range of 30 degrees to 70 degrees, more preferably the twist angles A and B may be in the range of 35 degrees to 65 degrees, and still more preferably the twist angles A and B are in the range of 40 degrees to 60 degrees. A range is good. In addition, since these twist angles A and B may show some dispersion | variation depending on a position, it is good to evaluate by averaging the twist angle of several places (for example, 20 places).

  Here, when the twist angles A and B of the strand 81 are both too small or too large, the angle formed by the strand 81 of the first bundle 82 and the strand 81 of the second bundle 83 is Since it becomes small, the effect which suppresses a proximity effect falls.

  Further, in the collective wire 51, the first bundle wire 82 and the second bundle wire at a third twist angle (angle formed by the center line of the bundle wires 82 and 83 and the center line of the collective wire 51 in a side view) C. 83 is twisted together. The third twist angle C does not affect the positional relationship between the strands 81 constituting the first bundle 82 and the second bundle 83, and may be set as appropriate.

  Next, the manufacturing method of the 1st bundled wire 82, the 2nd bundled wire 83, and the collection electric wire 51 is demonstrated. FIG. 10 is an explanatory view for explaining an apparatus for manufacturing the first bundle 82.

  In this manufacturing apparatus, four feeding machines 101 each wound with a wire 81 are housed in a housing 102 so as to be rotatable. Note that FIG. 10 shows the inside of the housing 102 through the housing 102. The casing 102 is mounted on a turntable 103, and the turntable 103 is rotated at a constant rotation speed by a motor (not shown). In the upper part of the housing 102, four strand lead portions 104 from which the strand 81 is pulled out under a constant tension are provided. Above the strand lead portion 104, a strand twisting portion 105 for twisting the strand 81 is disposed. The first bundle wire 82 formed by twisting the four strands 81 in the strand twisting section 105 is guided to the winder 106, where the first bundle wire 82 is wound.

  In the manufacturing apparatus configured as described above, when the strands 81 are twisted together to form the first bundled wire 82, the turntable 103 is rotated and the casing 102 is rotated at a constant rotational speed. The take-up machine 106 winds up the first bundle 82 at a constant speed. As a result, the first bundle 82 is pulled at a constant speed, and in response to this, the strand 81 is pulled out from the strand drawing portion 104 and the strand 81 is twisted by the strand twisting portion 105.

  Here, when the strands 81 are twisted together at the strand twisting unit 105, the rotation speed and winding of the turntable 103 are prevented so that the strands 81 are not excessively overlapped or the strands 81 are not separated too much. The winding speed of the machine 106 is adjusted.

  Moreover, the angle D of the strand 81 which goes to the strand twisting part 105 from the strand supply part 104 becomes the twist angle A (refer FIG. 7) of the strand 81, and the twist angle A of this strand 81 is the strand It can be changed by adjusting the distance L between the feeding portion 104 and the strand twisting portion 105.

  Although FIG. 10 shows an apparatus for manufacturing the first bundled wire 82, the second bundled wire 83 and the collective electric wire 51 can also be manufactured by a similar device. That is, in the second bundle 83, the rotation direction of the turntable 103 may be reversed, and thereby the second bundle 83 in which the twist direction of the first bundle 82 and the strand 81 is reversed. Can be manufactured. In the collective electric wire 51, the first bundled wire 82 and the second bundled wire 83 may be used instead of the strand 81.

  In addition, when the bundled wires 82 and 83 are twisted to manufacture the collective electric wire 51, the twist direction of the strand 81 is opposite to the twist direction of the bundle wires 82 and 83 simply by rotating the housing 102. In the first bundle 82, the twist of the strand 81 proceeds, and in the second bundle 83 in which the twist direction of the strand 81 is the same as the twist direction of the bundles 82, 83, the strand 81 returns. A mechanism for rotating the first bundle wire 82 and the second bundle wire 83 may be provided in the housing 102 so that the twisted state of the strand 81 does not change. Moreover, when manufacturing the bundle wires 82 and 83, the strands 81 may be twisted in consideration of changes in the twisted state of the bundle wires 82 and 83 when the bundle wires 82 and 83 are twisted together. .

  Next, a modified example of the collective wire 51 shown in FIG. 8 will be described. FIG. 11 is a schematic cross-sectional view showing the assembled wire 51 shown in FIG. 8 and a modification thereof.

  As shown in FIG. 11 (A), the collective electric wire 51 shown in FIG. 8 is obtained by twisting two first bundle wires 82 and two second bundle wires 83. In this case, by arranging the first bundle 82 and the second bundle 83 alternately, it is possible to prevent the first bundle 82 and the second bundle 83 from being adjacent to each other. Thus, the influence of the proximity effect can be further suppressed.

  On the other hand, in the example shown in FIG. 11B, six first bundle wires 82 and six second bundle wires 83 are twisted together. In this example, even if the same number of the first bundles 82 and the second bundles 83 are used, the first bundles 82 and the second bundles 83 cannot be alternately arranged. There is a place where the 82 or the second bundle 83 are adjacent to each other. However, since the rate at which the first bundle 82 and the second bundle 83 are adjacent to each other can be reduced, the influence of the proximity effect can be suppressed.

  As mentioned above, although this invention was demonstrated based on specific embodiment, these embodiment is an illustration to the last, This invention is not limited by these embodiment, The range which does not deviate from the meaning of this invention It can be changed as appropriate.

  That is, in the present embodiment, a configuration in which power is transmitted from the power transmission device 1 to the electronic device 2 in order to charge the secondary battery 3 mounted on the electronic device 2 will be described. Although it is suitable for a portable electronic device such as a mobile phone provided, the wireless power transmission in the present invention is not limited to the charging of such a secondary battery, but to an electronic device not equipped with a secondary battery. The operating power may be constantly supplied.

  Further, in the present embodiment, the collective electric wire 51 has a configuration in which the first bundled wire 82 and the second bundled wire 83 are twisted two by two. However, in the present invention, the bundled wires 82 and 83 are twisted together. The number is not particularly limited, and it is sufficient that at least one first bundle 82 and two second bundles 83 are provided. In the present embodiment, the first bundle wire 82 and the second bundle wire 83 have a configuration in which four strands 81 are twisted together. However, in the present invention, the number of strands 81 to be twisted is It is not particularly limited.

  The collective wire according to the present invention, a power transmission device and an electronic device using the same, and a wireless power transmission system sufficiently suppress the influence of the skin effect and the proximity effect, and increase the transmission distance between the power transmission coil and the power reception coil. In addition, even when there is a misalignment between the power transmission coil and the power reception coil, the power transmission efficiency is not greatly reduced, and power transmission is performed for purposes such as charging a secondary battery mounted on an electronic device. The present invention is useful as a collective wire used for wireless power transmission that wirelessly transmits power from an apparatus to an electronic apparatus, a power transmission apparatus and electronic apparatus using the same, and a wireless power transmission system.

DESCRIPTION OF SYMBOLS 1 Power transmission apparatus 2 Electronic device 3 Secondary battery 5 Power transmission coil 6 Power reception coil 51 Collecting wire 61 Power transmission coil 62 Power supply coil 65 Resonance capacitor 67 Power reception coil 68 Power supply coil 81 Strand 82 First bundle wire 83 Second bundle Wires A and B Strand angle C Strand angle

Claims (10)

An assembly wire having a plurality of strands coated with an insulating layer,
A first bundle wire in which a plurality of the strands are twisted together in either one of a right twist and a left twist;
A plurality of the strands that are twisted in the other twist direction of either the right twist or the left twist, and a second bundle wire,
The assembled electric wire, wherein the first bundled wire and the second bundled wire are twisted together in either the right twisted direction or the left twisted twisted direction. A plurality of the first bundle wires and the second bundle wires, respectively,
The assembled electric wire according to claim 1, wherein the first bundled wires and the second bundled wires are twisted together in an alternately arranged state.   The collective electric wire according to claim 2, wherein the same number of the first bundle wires and the second bundle wires are provided.   The sum of the twist angle of the strand in the first bundle and the twist angle of the strand in the second bundle is approximately 90 degrees. Collective wire as described in Crab.   The set according to any one of claims 1 to 4, wherein a twist angle of the strands in the first bundle wire and a twist angle of the strands in the second bundle wire are substantially equal. Electrical wire. A power transmission device that wirelessly transmits power to an electronic device by electromagnetic induction,
A power transmission device comprising a power transmission coil formed by winding the aggregated wire according to any one of claims 1 to 5. A parasitic coil disposed substantially concentrically with the power transmission coil with a predetermined gap;
The power transmission device according to claim 6, further comprising a resonance capacitor connected to both ends of the parasitic coil. An electronic device in which power is transmitted wirelessly from a power transmission device by electromagnetic induction,
An electronic device comprising a power receiving coil formed by winding the collecting wire according to any one of claims 1 to 5. A parasitic coil disposed substantially concentrically with the receiving coil with a predetermined gap;
The electronic device according to claim 8, further comprising a resonance capacitor connected to both ends of the parasitic coil. A wireless power transmission system that wirelessly transmits power from a power transmission device to an electronic device,
The power transmission device includes a power transmission coil,
The electronic device includes a power receiving coil,
At least one of the power transmission coil and the power reception coil is formed by a collective electric wire having a plurality of strands coated with an insulating layer,
This collective wire is
A first bundle wire in which a plurality of the strands are twisted together in either one of a right twist and a left twist;
A plurality of the strands that are twisted in the other twist direction of either the right twist or the left twist, and a second bundle wire,
The wireless power transmission system according to claim 1, wherein the first bundled wire and the second bundled wire are twisted together in either the right twist or the left twist.

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