JP2013207907A - Collective electric wire, power transmission device and electronic apparatus using the same, and wireless power transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a collective electric wire capable of reducing influences due to skin effect and proximity effect to prevent the power transmission efficiency from largely decreasing even when transmission distance between a power transmission coil and a power receiving coil is large or even when an axial displacement exists between the power transmission coil and the power receiving coil.SOLUTION: A collective electric wire 51 includes a first insulated wire 82 and a second insulated wire 83 each coated with an insulating layer. The first insulated wire is spirally wound at a first winding angle a1 forming an angle in one of a positive and a negative direction with respect to a length direction of the collective electric wire. The second insulated wire is spirally wound on the outer side of the first insulated wire at a second winding angle a2 forming an angle in the other of the positive and the negative direction with respect to the length direction of the collective electric wire. Particularly, the first insulated wire further includes a core wire 81 which is wound at the first winding angle. The sectional area of the second insulated wire is larger than the sectional area of the first insulated wire.

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 wire of the present invention is a collective wire having a first insulated wire and a second insulated wire coated with an insulating layer, and the first insulated wire is in the length direction of the collective wire. The second insulated wire is wound spirally at a first winding angle that forms an angle in one of the positive and negative directions, and the second insulated wire has an angle in either the positive or negative direction with respect to the length direction of the aggregated wire. A configuration is adopted in which the outside of the first insulated wire is spirally wound at the second winding angle formed.

  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. And at least one of the power transmission coil and the power reception coil is formed by a collective electric wire having a first insulated wire and a second insulated wire coated with an insulating layer, and the first insulated wire is formed of the collective wire. The second insulated wire is wound either in a positive or negative direction with respect to the length direction of the collective wire. The outside of the first insulated wire is spirally wound at a second winding angle that forms an angle in the other direction.

  According to the present invention, since a plurality of insulated wires are assembled, the influence of the skin effect can be suppressed, and furthermore, the direction of the current flowing through each insulated wire is greatly different, so the influence of the proximity effect is suppressed. can do. 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 part of the collecting wire 51 cut away Schematic side view showing a modified example of the collecting wire 51 Schematic side view showing a modified example of the collecting wire 51 Schematic side view showing a modified example of the collecting wire 51 Schematic side view for explaining the method of manufacturing the collecting wire 51 The side view which shows an example of the strand wire (elementary wires 82 and 83) which forms the 1st and 2nd layers 84 and 85, respectively Front view illustrating a method of manufacturing the stranded wire (element wires 82 and 83) shown in FIG. Explanatory drawing which shows each structure of Examples 1-5 regarding the collective wire 51 Explanatory drawing which shows the structure and power transmission efficiency of Examples 6-13 regarding the power transmission coil 5 and the receiving coil 6. FIG. Schematic configuration diagram of a measuring device used in evaluating power transmission efficiency

  A first invention made to solve the above-mentioned problems is a collective electric wire having a first insulated wire and a second insulated wire coated with an insulating layer, wherein the first insulated wire is the aggregated wire. The second insulated wire is spirally wound with respect to the length direction of the collective wire, and is wound in a spiral shape at a first winding angle that makes an angle in either the positive or negative direction with respect to the length direction of the wire. The outside of the first insulated wire is spirally wound at a second winding angle that forms an angle in the other direction.

  According to this, since a plurality of insulated wires are assembled, the influence of the skin effect can be suppressed, and furthermore, the direction of the current flowing through each insulated wire is greatly different, so the influence of the proximity effect is suppressed. Can do. 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.

  Moreover, 2nd invention is set as the structure further equipped with the core wire by which the said 1st insulated wire is wound by the said 1st winding angle.

  According to this, since an insulated wire should just be wound around a core wire sequentially, manufacture becomes easy. Moreover, the intensity | strength of the whole assembled electric wire can be raised. In addition, although a core wire is good to comprise with conductors, such as an insulated wire, it can also comprise with a nonconductor.

  Moreover, 3rd invention sets it as the structure where the cross-sectional area of a said 2nd insulated wire is larger than the cross-sectional area of a said 1st insulated wire.

  According to this, the intensity | strength of the whole assembled electric wire can be raised. Moreover, since the amount of current flowing on the outer peripheral side of the collecting wire can be increased, the magnetic flux generated from the coil can be increased.

  According to a fourth aspect of the present invention, the second insulated wire is wound so that the number of turns is smaller than that of the first insulated wire.

  According to this, the overall length of the outer second insulated wire can be shortened, and the overall length of the second insulated wire can be made closer to the overall length of the inner first insulated wire, thereby producing the inner and outer insulated wires together. Since the difference in inductance is reduced, the power transmission efficiency can be further increased.

  In the fifth invention, the first insulated wire is wound so as to have a first gap, and the second insulated wire has the second gap larger than the first gap. It is set as the structure wound so that it may have.

According to this, the total number of turns of the second insulated wire can be made smaller than the number of turns of the first insulated wire, and the total length of the second insulated wire can be made closer to the total length of the first insulated wire.
can do.

  Moreover, 6th invention is set as the structure further provided with the spacer provided in the said 2nd clearance gap.

  According to this, the space | interval of a 2nd insulated wire is hold | maintained by a spacer, and winding of a 2nd insulated wire also becomes easy.

  Moreover, 7th invention sets it as the structure where the cross-sectional area of the insulating layer of a said 2nd insulated wire is larger than the cross-sectional area of the insulating layer of a said 1st insulated wire.

  According to this, the total number of turns of the second insulated wire can be made smaller than the number of turns of the first insulated wire, and the total length of the second insulated wire can be made closer to the total length of the first insulated wire.

  In an eighth aspect of the invention, the second winding angle is smaller than the first winding angle.

  According to this, the total number of turns of the second insulated wire can be made smaller than the number of turns of the first insulated wire, and the total length of the second insulated wire can be made closer to the total length of the first insulated wire.

  Moreover, 9th invention sets it as the structure which a part of said 2nd insulated wire is the same direction as the length direction of the said assembly wire.

  According to this, the total number of turns of the second insulated wire can be made smaller than the number of turns of the first insulated wire, and the total length of the second insulated wire can be made closer to the total length of the first insulated wire.

  In a tenth aspect of the present invention, a part of the second insulated wire is wound at a winding angle smaller than the second winding angle.

  According to this, the total number of turns of the second insulated wire can be made smaller than the number of turns of the first insulated wire, and the total length of the second insulated wire can be made closer to the total length of the first insulated wire.

  The eleventh aspect of the invention is configured such that the absolute value of the first winding angle or the second winding angle is in the range of 30 degrees to 70 degrees.

  According to this, the influence of the proximity effect can be further suppressed.

  In a twelfth aspect of the invention, the sum of absolute values of the first winding angle and the second winding angle is in the range of 60 degrees to 140 degrees.

  According to this, the influence of the proximity effect can be further suppressed.

  In addition, a thirteenth aspect of the present invention is configured such that a plurality of the second insulated wires are twisted together to form a stranded wire.

  According to this, since the direction of the current is different between the insulated wires constituting the stranded wire, the influence of the proximity effect can be further suppressed, and the number of insulated wires is increased, so the influence of the skin effect is further enhanced. It is possible to suppress the power transmission efficiency.

  According to a fourteenth 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 that is formed by winding the aggregated wire.

  According to this, since the power transmission coil is formed of an aggregated wire in which a plurality of insulated wires are assembled, the influence of the skin effect can be suppressed, and the direction of the current flowing through each insulated wire is greatly different. Therefore, the influence of the proximity effect can be sufficiently 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.

  The fifteenth 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.

  According to a sixteenth aspect of the present invention, there is provided an electronic apparatus 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, since the power receiving coil is formed of an aggregated wire in which a plurality of insulated wires are assembled, the influence of the skin effect can be suppressed, and the direction of the current flowing through each insulated wire is greatly different. Therefore, the influence of the proximity effect can be sufficiently 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.

  According to a seventeenth aspect of the invention, there is provided a configuration further comprising a parasitic coil disposed substantially concentrically with the power receiving 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 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.

  An eighteenth aspect of the 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 first insulated wire and a second insulated wire coated with an insulating layer, and the first insulated wire is a length direction of the collective wire. The second insulated wire is wound in a spiral manner at a first winding angle that makes an angle in either one of the positive and negative directions with respect to the length direction of the collective wire. The outside of the first insulated wire is wound in a spiral shape at a second winding angle that forms an angle with the angle.

  According to this, since the power transmission coil and the power receiving coil are formed by an aggregated electric wire in which a plurality of insulated wires are assembled, the influence of the skin effect can be suppressed, and the direction of the current flowing through each insulated wire is large. Since they are different, the influence of the proximity effect can be sufficiently 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.

  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 a part of the collecting wire 51. FIG.

  In the example shown in FIG. 6A, the collective electric wire 51 includes a core wire 81 arranged in the center portion, and the strands 82 and 83 are wound around the core wire 81 with a predetermined winding angle (the center of the strands 82 and 83). The angle formed between the line parallel to the center line of the collecting wire 51 and the center line of the strands 82 and 83 on the cylindrical surface where the line is located) The first layer 84 and the second layer 85 have the winding directions of the strands 82 and 83 opposite to each other.

  In other words, the angle (first winding angle a1) formed by the length direction of the collecting wire 51 (center line of the collecting wire 51) and the winding direction of the strand 82 is relative to the length direction of the collecting wire 51. The angle between the length direction of the collecting wire 51 and the winding direction of the strand 83 (second winding angle a2) is an angle in the positive direction with respect to the length direction of the collecting wire 51. It is. That is, with reference to the length direction of the collecting wire 51, the winding angle a1 is opposite (opposite) to the positive / negative direction of the winding angle a2. That is, assuming that the angle when the winding direction of the wire 82 (or the wire 83) coincides with the length direction of the collecting wire 51 is 0 degree, −90 degrees <winding angle a1 <0 degree, 0 degree <winding angle The relationship of a2 <90 degrees is satisfied. The winding angle a1 may be a positive angle (0 <winding angle a1 <90), and the winding angle a2 may be a negative angle (−90 degrees <winding angle a2 <0 degrees).

  When the first to fourth quadrants are formed by the length direction of the collecting wire 51 and a straight line perpendicular to the length direction, the winding direction of the strands 82 is the fourth quadrant (or the second quadrant). I.e., a straight line passing through the second quadrant and the fourth quadrant. The winding direction of the wire 83 is located in the first quadrant (or the third quadrant), that is, a straight line passing through the first quadrant and the third quadrant.

  The core wire 81 is composed of one insulated wire. The inner first layer 84 is formed by winding a wire 82 (here, one insulated wire (first insulated wire)) around the core wire 81. The outer second layer 85 is formed by winding a wire 83 (here, one insulated wire (second insulated wire)) around the first layer 84.

  In the example shown in FIG. 6 (B), the collective electric wire 51 has a core wire 81 disposed in the center and a first wire formed around the core wire 81, as in the example shown in FIG. 6 (A). Layer 84 and a second layer 85 formed around the first layer 84. Here, a plurality of insulated wires (first wires 83) are connected to the wires 83 of the second layer 85. 2 stranded wires (single stranded wires) are used. The other configuration is the same as the example shown in FIG. 6A. A single wire of an insulated wire is used for the core wire 81, and a single wire (first wire) of the insulated wire is used for the element wire 82 of the first layer 84. Insulated electric wires) are used, and the winding directions of the strands 82 and 83 of the first layer 84 and the second layer 85 are opposite to each other.

  In the example shown in FIG. 6 (C), the collective electric wire 51 has a core wire 81 arranged at the center and a first wire formed around the core wire 81, as in the example shown in FIG. 6 (A). Layer 84 and a second layer 85 formed around the first layer 84. Here, the strands 82 of the first layer 84 and the elements of the second layer 85 are included. A stranded wire (single stranded wire) in which a plurality of insulated wires (first insulated wire and second insulated wire) are twisted together is used as the wire 83. The other configuration is the same as that of the example shown in FIG. 6A, and a single wire of an insulated wire is used for the core wire 81. The first layer 84 and the second layer 85 include the strands 82 and 83. The winding directions are opposite to each other.

  As described above, when a stranded wire obtained by twisting a plurality of insulated wires is used as the strand 82 of the first layer 84 or the strand 83 of the second layer 85, the insulated wires in the layers 84 and 85 are electrically connected with each other. Since the directions are different, the influence of the proximity effect can be further suppressed, and the number of insulated wires in each layer 84 and 85 is increased, so that the influence of the skin effect can be further suppressed, thereby allowing power transmission. Efficiency can be further increased. In particular, if a stranded wire is used for the outermost layer, here, the strand 83 of the second layer 85, the strand 83 is partially exposed and has many portions that do not contact other insulated wires. It is effective in suppressing the influence of the proximity effect.

  In the illustrated example, the wire 82 forming the first layer 84 is wound in the right direction (Z winding), and the wire 83 forming the second layer 85 is wound in the left direction (S winding). However, this winding direction may be reversed.

  When the collective electric wire 51 having such a configuration is used for the power transmission coil 5 or the power reception coil 6, since a plurality of the strands 82 and 83 are aggregated, the influence of the skin effect can be suppressed. Since the direction of the current flowing through 83 is greatly different, the influence of the proximity effect can be suppressed. Thereby, it is possible to suppress power loss and increase power transmission efficiency. Particularly in high-power wireless power transmission, when the transmission distance between the power transmission coil 5 and the power reception coil 6 is increased, or when the power transmission coil 5 and the power reception coil 6 are increased. Even when there is an axis misalignment, it is possible to avoid a significant decrease in power transmission efficiency.

Here, the core wire 81, the wire 82 of the first layer 84, and the wire 83 of the second layer 85 have a larger cross-sectional area as they are located on the outer side, that is, the cross-sectional area of the core wire 81 is A1, When the cross-sectional area of the wire 82 of the first layer 84 is A2, and the cross-sectional area of the wire 83 of the second layer 85 is A3, the relationship of A1 ≦ A2 ≦ A3 may be satisfied. In particular, as shown in Equations 1 to 3, preferably, the ratio (increase rate) of the cross-sectional area of the one located closest to the inside to the one located outside is in a range of 1.1 to 3 times (Equation 1 More preferably in the range of 1.2 times to 2.5 times (see Formula 2), and still more preferably in the range of 1.4 times to 2 times (see Formula 3).
A1 × 1.1 ≦ A2 ≦ A1 × 3, A2 × 1.1 ≦ A3 ≦ A2 × 3 (Formula 1)
A1 × 1.2 ≦ A2 ≦ A1 × 2.5, A2 × 1.2 ≦ A3 ≦ A2 × 2.5 (Formula 2)
A1 × 1.4 ≦ A2 ≦ A1 × 2, A2 × 1.4 ≦ A3 ≦ A2 × 2 (Formula 3)

  As described above, when the core wire 81, the wire 82 of the first layer 84 and the wire 83 of the second layer 85 are arranged so that the cross-sectional area becomes larger toward the outer side, the strength of the entire collecting wire 51 is increased. Can be increased. Further, since the amount of current flowing on the outer peripheral side of the collecting wire 51 can be increased, the magnetic flux generated from the power transmission coil 5 can be increased.

  The winding angles a1 and a2 of the strands 82 and 83 with respect to the center line of the collecting wire 51 are preferably in the range of 30 degrees to 70 degrees. The winding angles a1 and a2 are preferably in the range of 35 degrees to 65 degrees, and more preferably in the range of 40 degrees to 60 degrees. The winding angles a1 and a2 of the strands 82 and 83 may vary somewhat depending on the positions on the strands 82 and 83, so the winding angles a1 and a2 at a plurality of locations (10 to 20 locations). Should be evaluated on average.

  Further, the angle of intersection of the two strands 82 and 83 wound in opposite directions, that is, the angle obtained by adding the winding angles a1 and a2 of the two strands 82 and 83 is in the range of 60 degrees to 140 degrees. It is good to be in. The intersection angle of the strands 82 and 83 is preferably in the range of 70 degrees to 130 degrees, and more preferably in the range of 80 degrees to 120 degrees.

  When the winding angles a1 and a2 of the strands 82 and 83 are within the above range, and the intersection angle of the two strands 82 and 83 is within the above range, the adjacent strands 82 and 83 are adjacent to each other. Since the direction of the current flowing through can be greatly shifted, the proximity effect can be more reliably suppressed.

  The diameters of the core wire 81, the wire 82 of the first layer 84, and the wire 83 of the second layer 85 vary depending on the sizes of the power transmission coil 5 and the power reception coil 6, but are generally 0.05 mm to 0.2 mm. It is preferable to set it as the range.

  Incidentally, as described above, the collective electric wire 51 has a multilayer structure in which the layers 84 and 85 formed by winding the strands 82 and 83 are laminated. In such a configuration, the element 85 of the layer 85 positioned on the outside is formed. The total length of the wire 83 is longer, and there is a difference in inductance between the inner and outer strands 82 and 83.

  Therefore, in order to shorten the total length of the strand 83 (in order to make the total length of the strand 83 close to the total length of the strand 82), the strand 83 is wound so that the number of turns is smaller than that of the strand 82. Is preferred. An example is shown below. Here, the number of windings refers to the number of times that the strands 82 and 83 circulate around the core wire 81 (or the center line of the collecting wire 51).

  7, 8, and 9 are schematic side views showing modifications of the collective wire 51.

  FIG. 7 shows an example in which the strands 83 of the layer 85 located outside are wound so that the winding density is low. In the example shown in FIG. 7A, the wire 83 is wound so as to have a predetermined gap in order to reduce the winding density. In the example shown in FIG. 7B, the strand 82 is also wound with a predetermined gap (first gap), and the gap of the strand 83 (second gap) is larger than the gap of the strand 82. It is getting bigger.

  In the example shown in FIG. 7C, a spacer 86 is provided in the gap (second gap) between the strands 83. Thereby, the space | interval of the strand 83 is hold | maintained by the spacer 86, and the winding of the strand 83 becomes easy. Here, the spacer 86 is spirally wound along the strand 83, but the spacer is not limited to such a configuration as long as it maintains the spacing between the strands 83. .

  FIG. 8 is an example in which the thickness of the insulated wire coating (insulating layer) 83b used for the wire 83 is increased in order to shorten the total length of the wire 83. That is, the cross-sectional area of the insulating layer 83 b of the strand 83 is larger than the cross-sectional area of the insulating layer 82 b of the strand 82. In other words, the distance d2 between the outer peripheral surface of the linear conductor 83a of the strand 83 and the outer peripheral surface of the strand 83 (the insulating layer 83b) is equal to the outer peripheral surface of the linear conductor 82a of the strand 82 and the strand 82 It becomes larger than the distance d1 with the outer peripheral surface of the insulating layer 82b). The insulating layers 82b and 83b of the strands 82 and 83 may be formed from a plurality of layers.

  Moreover, in order to shorten the full length of the strand 83, the strand 83 may be made thicker than the strand 82 as shown in FIG. That is, the cross-sectional area of the strand 83 is larger than the cross-sectional area of the strand 82.

  FIG. 9 is an example in which the winding method of the wire 83 is changed in order to shorten the overall length of the wire 83. In the example shown in FIG. 9A, the winding angle (second winding angle) a2 of the strand 83 is made smaller than the winding angle (first winding angle) a1 of the strand 82. Needless to say, the magnitudes of the winding angles a1 and a2 are determined by the absolute values of the winding angles a1 and a2. For example, the winding angle a1 is set to −45 degrees and the winding angle a2 is set to 30 degrees.

  In the example shown in FIG. 9B, in order to shorten the total length of the strand 83, a part of the strand 83 is not wound. That is, a part of the strand 83 is in the same (substantially parallel) direction as the length direction of the collecting wire 51. In the example shown in FIG. 9C, a part of the strand 83 is wound at a winding angle a2 '(for example, 40 degrees) smaller than the winding angle a2 (for example, 45 degrees).

  By winding the strands 82 and 82 as described above, the number of windings of the strand 83 is reduced, and the overall length of the strand 83 can be shortened. That is, the total length of the strand 83 can be made close to the total length of the strand 82. Therefore, the difference in inductance generated between the inner and outer strands 82 and 83 is reduced, and the power transmission efficiency can be further enhanced. Note that several winding methods for reducing the number of windings of the wire 83 described above may be combined as appropriate.

  In the present embodiment, the collecting wire 51 has a three-layer structure including the core wire 81, the first layer 84, and the second layer 85, but it may have a structure of four or more layers. When the number of layers is increased in this way, the cross-sectional area of the entire collecting wire 51 can be increased, and the strength of the magnetic force generated from the coil can be increased. In this case, it is preferable to alternately form the first layer 84 and the second layer 85 whose winding directions are opposite to each other. Further, it is preferable that the relationship between the angles (intersection angles with the winding angles a1 and a2) and the cross-sectional areas of the strands 82 and 83 described above is satisfied in all layers, but at least the outermost positions are positioned. It is preferable that the above-described relationship between the angle of the strand and the cross-sectional area be satisfied between the layer and the inner layer adjacent thereto. Thereby, the structure which a strand cross | intersects increases, and the effect of proximity effect suppression can be made more reliable.

  Next, the manufacturing method of the collection electric wire 51 is demonstrated. FIG. 10 is a schematic side view for explaining a method for manufacturing the assembled wire 51. Here, the procedure for forming the first layer 84 by winding the wire 82 around the core wire 81 is shown.

  The strand supply device 91 is composed of a roll or the like that holds a certain amount of the strand 82, and feeds the strand 82 at a constant speed. The strand supply device 91 is supported by appropriate support means so as to be movable in a direction parallel to the core wire 81. The core wire 81 is rotated (autorotated) while being held by a rotating device (not shown) at both ends. The rotation of the core wire 81 and the movement of the strand supply device 91 are performed in synchronization with each other.

  When the tip of the strand 82 is fixed to the core 81, the strand 82 is fed out from the strand supply device 91 at a constant speed and the strand supply device 91 is moved at a constant speed. Wrap around. At this time, the winding angle a1 (see FIG. 6) of the strand 82 can be made uniform by keeping the inclination angle b1 of the strand 82 drawn out from the strand supply device 91 with respect to the core 81 constant. In addition, the rotational speed of the core wire 81 and the moving speed of the strand supply device 91 are set so that the strands 82 do not overlap each other or the gap between the strands 82 becomes large and the core wire 81 is not excessively exposed. adjust.

  Further, the inclination angle b1 of the strand 82 drawn out from the strand supply device 91 with respect to the core wire 81 defines the winding angle a1 (see FIG. 6) of the strand 82, and this winding angle a1 is adjusted. In other words, at the start of winding the wire 82 around the core wire 81, the position of the wire supply device 91 relative to the winding position where the wire 82 winds around the core wire 81 may be moved back and forth. As shown in FIG. 10A, when the strand supply device 91 is brought close to the winding position, the winding angle a1 of the strand 82 can be increased. As shown in FIG. When the device 91 is moved away from the winding position, the winding angle a1 of the strand 82 can be reduced.

  Here, the procedure for forming the first layer 84 by winding the strand 82 around the core wire 81 has been described. However, the second layer 85 is formed by winding the strand 83 around the first layer 84. In the case of formation, the same procedure may be performed.

  11 forms the strand 83 (twisted wire) forming the second layer 85 shown in FIG. 6B and the first and second layers 84 and 85 shown in FIG. 6C, respectively. It is a side view which shows an example of the strands 82 and 83 (stranded wire) to do.

  In the example shown in FIG. 11A, two insulated wires 101 are twisted together by single twisting. The twisting direction may be either right-handed or left-handed. The twist angle c of the insulated wire 101 is preferably in the range of 30 degrees to 70 degrees, preferably in the range of 35 degrees to 65 degrees, and more preferably in the range of 40 degrees to 60 degrees.

  In the example shown in FIG. 11B, the three insulated wires 101 are twisted together by single twisting. The twisting direction may be either right-handed or left-handed. If it does in this way, since the number of the insulated wires 101 increases further in each layer 84 and 85, electric power transmission efficiency can be raised further.

  Next, the manufacturing method of the strands 82 and 83 which have the strand wire which twisted together the three insulated wires 101 shown to FIG. 11 (B) is demonstrated. FIG. 12 is a front view for explaining a method of manufacturing the strands 82 and 83 having the stranded wires shown in FIG.

  The three insulated wire supply devices 111 that feed out the insulated wire 101 are configured by a roll or the like that holds a certain amount of insulated wire 101, and the insulated wire 101 is fed out at a constant speed. This insulated wire supply device 111 is arranged at equal intervals (120 degrees) in the circumferential direction, and rotates (revolves) around a center line where the three insulated wires 101 are intertwined, and moves in a direction perpendicular to the paper surface. The three insulated wires are supported by appropriate supporting means as possible, and the insulated wire supply device 111 is rotated in the same direction at a constant speed while the insulated wire 101 is fed out from the insulated wire supply device 111 at a constant speed. 101 is twisted together.

  At this time, the tip of the insulated wire 101 drawn out from each insulated wire supply device 111 is fixed in advance to an appropriate fixing means. During the rotation of the insulated wire supply device 111, the inclination angle d (see FIG. 11) of the insulated wire 101 with respect to the center line is kept constant. This inclination angle d defines the twist angle c, and this twist angle c can be adjusted at the position of the insulated wire supply device 111 at the start time. The three insulated wire supply devices 111 are moved at a constant speed in a direction orthogonal to the paper surface while maintaining the relative position in synchronization with the rotation. Here, the number of rotations and the moving speed of the insulated wire supply device 111 are adjusted so that the insulated wires 101 are not excessively overlapped or the insulated wires 101 are not separated too much.

  As shown in FIG. 11A, the strands 82 and 83 having stranded wires obtained by twisting two insulated wires 101 can be manufactured in the same manner. The two insulated wire supply devices 111 that feed out the wire may be rotated around the center line where the two insulated wires 101 are intertwined.

  In addition, in this embodiment, in order to charge the secondary battery 3 mounted in the electronic device 2, the structure which transmits electric power from the power transmission apparatus 1 to the electronic device 2 is demonstrated, and such a structure is a secondary battery. 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, as illustrated in FIG. 6, the example in which the core wire 81 is provided at the center of the collective electric wire 51 has been described, but a configuration in which the core wire 81 is not provided is also possible. Further, even when the core wire 81 is provided, the core wire 81 can be configured only with a non-conductor such as a synthetic resin instead of a conductor such as an insulated wire.

  Examples of the present invention will be described below.

  First, Examples 1 to 5 related to the collective wire 51 will be described. FIG. 13 is an explanatory diagram illustrating each configuration of the first to fifth embodiments related to the collective wire 51.

  In the first embodiment, as illustrated in FIG. 6A, the assembly wire 51 including the core wire 81, the strand 82 of the first layer 84 and the strand 83 of the second layer 85 is employed, and the core wire 81, For both the strands 82 of the first layer 84 and the strands 83 of the second layer 85, insulated wires having a diameter of 0.1 mm were used. Further, the winding angle a1 of the strand 82 of the first layer 84 is 30 degrees, the winding angle a2 of the strand 83 of the second layer 85 is 50 degrees, and the intersection angle between the strand 82 and the strand 83 is 80 degrees. It was. In addition, the first layer 84 and the second layer 85 are alternately formed, and the number of each of the first layer 84 and the second layer 85 is set to 20.

  In the second embodiment, as in the first embodiment, the collective electric wire 51 having the configuration shown in FIG. 6A is adopted, an insulated electric wire having a diameter of 0.08 mm is used as the core wire 81, and the strand 82 of the first layer 84 is used. An insulated wire having a diameter of 0.1 mm was used, and an insulated wire having a diameter of 0.12 mm was used for the strand 83 of the second layer 85. Further, the winding angle a1 of the strand 82 of the first layer 84 is 30 degrees, the winding angle a2 of the strand 83 of the second layer 85 is 45 degrees, and the intersection angle between the strand 82 and the strand 83 is 75 degrees. It was. In addition, the first layer 84 and the second layer 85 were alternately formed, and the number of each of the first layer 84 and the second layer 85 was set to 16.

  In the third embodiment, similarly to the first embodiment, the collective electric wire 51 having the configuration shown in FIG. 6A is adopted, an insulated electric wire having a diameter of 0.06 mm is used as the core wire 81, and the strand 82 of the first layer 84. An insulated wire having a diameter of 0.1 mm was used, and an insulated wire having a diameter of 0.15 mm was used for the strand 83 of the second layer 85. Further, the winding angle a1 of the strand 82 of the first layer 84 is 40 degrees, the winding angle a2 of the strand 83 of the second layer 85 is 50 degrees, and the intersection angle between the strand 82 and the strand 83 is 90 degrees. It was. In addition, the first layer 84 and the second layer 85 were alternately formed, and the number of layers of the first layer 84 and the second layer 85 was twelve.

  In Example 4, as shown in FIG. 6B, the collective electric wire 51 in which the second layer 85 is formed by the strands 83 that are stranded wires (single stranded wires) is employed. An insulated wire having a diameter of 0.08 mm was used for the core wire 81, and an insulated wire having a diameter of 0.08 mm was used for the strand 82 of the first layer 84. As the strand 83 of the second layer 85, a stranded wire obtained by twisting insulated wires having a diameter of 0.1 mm is used, and four insulated wires are twisted to form a stranded wire, and the twist angle c is 35 degrees. . Further, the winding angle a1 of the strand 82 of the first layer 84 is 45 degrees, the winding angle a2 of the strand 83 (twisted wire) of the second layer 85 is 50 degrees, and the The crossing angle was 95 degrees. In addition, the first layer 84 and the second layer 85 were alternately formed, and the number of layers of the first layer 84 and the second layer 85 was fifteen.

  In Example 5, as shown in FIG. 6 (C), the collective electric wire 51 in which the first layer 84 and the second layer 85 are both formed by the strands 82 and 83 that are stranded wires (single stranded wires). Adopted. An insulated wire having a diameter of 0.06 mm was used for the core wire 81. The strands 82 of the first layer 84 and the strands 83 of the second layer 85 are stranded wires in which insulated wires having a diameter of 0.06 mm are twisted, and four of the insulated wires are twisted to form a stranded wire. The twist angle c is 30 degrees. Further, the winding angle a1 of the strand 82 (stranded wire) of the first layer 84 is 40 degrees, the winding angle a2 of the strand 83 (stranded wire) of the second layer 85 is 60 degrees, and the strand 82 and strand The angle of intersection with the line 83 was set to 100 degrees. In addition, the first layer 84 and the second layer 85 were alternately formed, and the number of layers of the first layer 84 and the second layer 85 was twelve.

  Next, Examples 6 to 13 related to the power transmission coil 5 and the power receiving coil 6 using the collective wires 51 of Examples 1 to 5 and the results of evaluating the power transmission efficiency in Examples 6 to 13 will be described. FIG. 14 is an explanatory diagram showing configurations and power transmission efficiencies of Examples 6 to 13 related to the power transmission coil 5 and the power reception coil 6. FIG. 15 is a schematic configuration diagram of a measuring device used in the evaluation of power transmission efficiency.

In the evaluation of the power transmission efficiency, as shown in FIG. 15, the current I1 and the voltage V1 of the power supplied from the constant voltage power source to the power transmission coil 5 through the power transmission circuit are measured, and the power generated in the power reception coil 6 is measured. Was used to measure the current I2 and the voltage V2 generated on the load side through the power receiving circuit, and the power transmission efficiency η was calculated by the following equation.
η = V2 × I2 / V1 × I1
Here, the switching frequency of the power transmission circuit is 150 kHz, the transmission distance between the power transmission coil 5 and the power reception coil 6 (the axial distance between the power transmission coil 5 and the power reception coil 6) is 40 mm, and the transmission power from the power transmission circuit is 20W. In addition to the state in which the central axes of the power transmission coil 5 and the power reception coil 6 are aligned, the power transmission efficiency was evaluated in a state where there was an axial shift that was 15% shifted from the diameter.

  In Example 6, the collective electric wire 51 of Example 1 was employ | adopted and the winding number of this collective electric wire 51 was 40 times. The coil configuration shown in FIG. 3 was used. In Example 6, the power transmission efficiency η was 73%, and it was confirmed that good power transmission was possible. In addition, it was confirmed that even when the power transmission coil 5 and the power receiving coil 6 are misaligned, the power transmission efficiency hardly decreases.

  In Example 7, the collective electric wire 51 of Example 2 was employ | adopted and the winding number of this collective electric wire 51 was 40 times. The coil configuration shown in FIG. 3 (no parasitic coil) was adopted. In Example 7, the power transmission efficiency η was 75%, and it was confirmed that good power transmission was possible. In addition, it was confirmed that even when the power transmission coil 5 and the power receiving coil 6 are misaligned, the power transmission efficiency hardly decreases.

  In Example 8, the collective electric wire 51 of Example 3 was employ | adopted and the winding number of this collective electric wire 51 was 40 times. The coil configuration shown in FIG. 3 (no parasitic coil) was adopted. In Example 8, the power transmission efficiency η was 76%, and it was confirmed that good power transmission was possible. In addition, it was confirmed that even when the power transmission coil 5 and the power receiving coil 6 are misaligned, the power transmission efficiency hardly decreases.

  In Example 9, the collective electric wire 51 of Example 3 was employ | adopted and the winding number of this collective electric wire 51 was 40 times. The coil configuration shown in FIG. 5 (with a parasitic coil) was adopted. In Example 9, the power transmission efficiency η was 78%, and it was confirmed that good power transmission was possible. In addition, it was confirmed that even when the power transmission coil 5 and the power receiving coil 6 are misaligned, the power transmission efficiency hardly decreases.

  In Example 10, the collective electric wire 51 of Example 4 was employ | adopted and the winding number of this collective electric wire 51 was 50 times. The coil configuration shown in FIG. 3 (no parasitic coil) was adopted. In Example 10, the power transmission efficiency η was 80%, and it was confirmed that good power transmission was possible. In addition, it was confirmed that even when the power transmission coil 5 and the power receiving coil 6 are misaligned, the power transmission efficiency hardly decreases.

  In Example 11, the collective electric wire 51 of Example 4 was employ | adopted and the winding number of this collective electric wire 51 was 50 times. The coil configuration shown in FIG. 5 (with a parasitic coil) was adopted. In Example 11, the power transmission efficiency η was 82%, and it was confirmed that good power transmission was possible. In addition, it was confirmed that even when the power transmission coil 5 and the power receiving coil 6 are misaligned, the power transmission efficiency hardly decreases.

  In Example 12, the collective electric wire 51 of Example 5 was employ | adopted and the winding number of this collective electric wire 51 was 60 times. The coil configuration shown in FIG. 3 (no parasitic coil) was adopted. In Example 12, the power transmission efficiency η was 82%, and it was confirmed that good power transmission was possible. In addition, it was confirmed that even when the power transmission coil 5 and the power receiving coil 6 are misaligned, the power transmission efficiency hardly decreases.

  In Example 13, the collective wire 51 of Example 5 was adopted, and the number of turns of the collective wire 51 was 60 times. The coil configuration shown in FIG. 5 (with a parasitic coil) was adopted. In Example 13, the power transmission efficiency η was 84%, and it was confirmed that good power transmission was possible. In addition, it was confirmed that even when the power transmission coil 5 and the power receiving coil 6 are misaligned, the power transmission efficiency hardly decreases.

  Further, when comparing the sixth, seventh, and eighth embodiments in which the parasitic coil is not used and the number of turns is the same, the power transmission efficiency is higher in the order of the first, second, and third embodiments with respect to the collecting wire 51. The effectiveness of increasing the cross-sectional area of the wire 81 and the wire 82 of the first layer 84 and the wire 83 of the second layer 85 located on the outer side was demonstrated. In addition, the ninth, eleventh, and thirteenth examples that employ a parasitic coil provide better results than the eighth, tenth, and twelve examples that do not employ a parasitic coil, demonstrating the effectiveness of a coil configuration that includes a parasitic coil. It was done.

  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 has an effect that the power transmission efficiency is not greatly reduced, and the power transmission device is used for charging a secondary battery mounted on an electronic device. It is useful as a collective wire used for wireless power transmission that wirelessly transmits power to an electronic device, a power transmission device and electronic device 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 Core wire 82, 83 Elementary wire 84 1st layer 85 1st Layers a1, a2 Winding angle b1 Inclination angle c Twisting angle d Inclination angle

Claims (18)

A collective wire having a first insulated wire and a second insulated wire coated with an insulating layer,
The first insulated wire is spirally wound at a first winding angle that forms an angle in either the positive or negative direction with respect to the length direction of the collective wire,
The second insulated wire is spirally wound around the outside of the first insulated wire at a second winding angle that forms an angle in either the positive or negative direction with respect to the length direction of the aggregated wire. Collective wire characterized by that.   The assembled electric wire according to claim 1, further comprising a core wire around which the first insulated electric wire is wound at the first winding angle.   The assembled wire according to claim 1 or 2, wherein a cross-sectional area of the second insulated wire is larger than a cross-sectional area of the first insulated wire.   The collective electric wire according to any one of claims 1 to 3, wherein the second insulated electric wire is wound so that the number of turns is smaller than that of the first insulated electric wire. The first insulated wire is wound so as to have a first gap,
The said 2nd insulated wire is wound so that it may have the said 2nd clearance gap larger than the said 1st clearance gap, The collective wire of Claim 4 characterized by the above-mentioned.   The assembled electric wire according to claim 5, further comprising a spacer provided in the second gap.   The collective electric wire according to claim 4, wherein a cross-sectional area of the insulating layer of the second insulated wire is larger than a cross-sectional area of the insulating layer of the first insulated wire.   The assembled electric wire according to claim 4, wherein the second winding angle is smaller than the first winding angle.   The part of said 2nd insulated wire is the same direction as the length direction of the said assembled wire, The assembled wire of Claim 4 characterized by the above-mentioned.   The part of said 2nd insulated wire is wound by the winding angle smaller than the said 2nd winding angle, The collective wire of Claim 4 characterized by the above-mentioned.   The aggregate electric wire according to any one of claims 1 to 10, wherein an absolute value of the first winding angle or the second winding angle is in a range of 30 degrees to 70 degrees.   The aggregate wire according to any one of claims 1 to 11, wherein a sum of absolute values of the first winding angle and the second winding angle is in a range of 60 degrees to 140 degrees.   The aggregated electric wire according to any one of claims 1 to 12, wherein a plurality of the second insulated electric wires are twisted to form a stranded 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 13. A parasitic coil disposed substantially concentrically with the power transmission coil with a predetermined gap;
The power transmission device according to claim 14, 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 13. A parasitic coil disposed substantially concentrically with the receiving coil with a predetermined gap;
The electronic apparatus according to claim 16, 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 first insulated wire and a second insulated wire coated with an insulating layer,
The first insulated wire is spirally wound at a first winding angle that forms an angle in either the positive or negative direction with respect to the length direction of the collective wire,
The second insulated wire is spirally wound around the outside of the first insulated wire at a second winding angle that forms an angle in either the positive or negative direction with respect to the length direction of the collective wire. A wireless power transmission system characterized by that.

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