JP2015080311A - Composite cable, and coil for non-contact power reception and supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the deterioration of power transmission efficiency caused by a proximity effect, and to reduce construction cost etc. at non-contact power supply to an electric apparatus, an automobile, etc.SOLUTION: A composite cable includes: a plurality of power lines for transmitting high frequency power for non-contact power supply; and a signal line, disposed along the power lines, for transmitting an electric signal. At least the plurality of power lines are disposed in parallel on the same plane.

Description

  The present invention relates to a composite cable and a non-contact power supply / reception coil formed using the composite cable.

  For example, when performing non-contact power supply (wireless power supply) to electrical equipment, electric vehicles, etc., a stranded wire (hereinafter also referred to as a litz wire) obtained by twisting a plurality of thin enamel-coated wires is used as a power transmission cable. A technique for performing power transmission is known (see, for example, Patent Document 1).

JP 2013-080441 A

  In order to perform the above-described contactless power feeding, it is necessary to exchange electrical signals (control signals and the like) for starting and ending power feeding between the power feeding device and the power receiving device. However, the power transmission cable is not configured to transmit an electrical signal. If it is necessary to separately lay a signal line for transmitting an electrical signal between the power feeding device and the power receiving device, the laying cost may increase.

  An object of the present invention is to suppress a decrease in power transmission efficiency due to a proximity effect or reduce a laying cost or the like when performing non-contact power supply to an electric device, an electric vehicle, or the like.

In order to solve the above problems, the present invention is configured as follows.
According to a first aspect of the present invention, there are provided a plurality of power lines that transmit high-frequency power for contactless power feeding, and a signal line that is disposed along the power lines and transmits an electrical signal, and at least The power line is provided with a composite cable arranged in parallel on the same plane.

  According to a second aspect of the present invention, in the first aspect, the signal line is disposed along a power line disposed inside the outermost power line among the plurality of power lines. A composite cable is provided.

  According to a third aspect of the present invention, there is provided the composite cable according to the first or second aspect, wherein the signal line is disposed at a central portion in the width direction of the composite cable.

  According to the fourth aspect of the present invention, the signal line is located inside the power line arranged on the outermost side among the plurality of power lines, and located at a maximum distance from the power line arranged on the outermost side. A composite cable according to any of the first to third aspects is provided.

  According to the fifth aspect of the present invention, the plurality of power lines are symmetrically arranged in the width direction of the composite cable with the signal line interposed therebetween, the composite cable according to any one of the first to fourth aspects. Is provided.

  According to a sixth aspect of the present invention, the composite cable according to any one of the first to fifth aspects, comprising a plurality of the signal lines, wherein the plurality of signal lines are arranged together so as to be adjacent to each other. Is provided.

  According to the 7th aspect of this invention, the coil for non-contact electric power feeding / forming formed by winding the composite cable in any one of the 1st-6th aspect is provided.

  ADVANTAGE OF THE INVENTION According to this invention, when performing non-contact electric power feeding with respect to an electric equipment, an electric vehicle, etc., the fall of the power transmission efficiency by a proximity effect can be suppressed, or laying cost etc. can be reduced.

1 is a schematic configuration diagram of a contactless power supply and reception system according to an embodiment of the present invention. (A) is a partially broken schematic perspective view of the composite cable concerning one Embodiment of this invention, (b) is a partially broken schematic perspective view of the composite cable concerning the modification. (A) is a schematic sectional drawing of the composite cable which concerns on one Embodiment of this invention, (b)-(i) is a schematic sectional drawing of the composite cable concerning the modification. It is a schematic block diagram of the electric power feeder and electric power receiving apparatus concerning one Embodiment of this invention. It is a figure which illustrates the waveform of the electric power supplied to a composite cable. It is a figure which illustrates the waveform of the electric power supplied to the composite cable concerning one Embodiment of this invention. It is the schematic which shows an example of the high frequency signal track | line concerning one Embodiment of this invention. It is a graph which shows the electrical property of the composite cable concerning one Example of this invention. It is a graph which shows the electrical property of the composite cable concerning one Example of this invention.

<One Embodiment of the Present Invention>
Hereinafter, an embodiment of the present invention will be described mainly with reference to FIGS.

(1) Configuration of a contactless power supply / reception system As shown in FIG. 1, a contactless power supply / reception system 1 according to the present embodiment is supplied with high frequency power, and a power supply device 2 that supplies high frequency power. The contactless power supply / reception coil 3 (hereinafter also referred to as the power supply coil 3 or the primary coil 3) that forms a magnetic field, and contactless reception that generates an induced electromotive force in response to a change in the magnetic field generated by the primary coil 3. A power coil 4 (hereinafter also referred to as a power receiving coil 4 or a secondary coil 4) and a power receiving device 5 that supplies an induced electromotive force obtained from the secondary coil 4 to a load such as a battery. The primary coil 3 and the secondary coil 4 are each formed by winding the composite cable 10. Resonating capacitors 6 and 7 are provided between the primary coil 3 and the power feeding device 2 and between the secondary coil 4 and the power receiving device 5, respectively.

(Composite cable and non-contact coil)
As shown in FIG. 2A, the composite cable 10 includes a plurality (here, five as an example) of power lines 11 that transmit high-frequency power for contactless power supply and reception, and electric signals arranged along the power lines 11. Signal lines 12 (here, two lines as an example). As will be described later, the composite cable 10 can be used not only for feeding high-frequency power but also for receiving power. The composite cable 10 can be used not only for transmission of electrical signals but also for reception.

  The power line 11 is configured as an enamel-coated wire including a center conductor 13 and a skin 14 that covers the outer periphery of the center conductor 13. The center conductor 13 is made of a metal material including, for example, copper or aluminum. The outer skin 14 constituting the outermost periphery of the power line 11 is made of a material having self-bonding properties. As the material having self-bonding property, for example, a material containing at least one of polyvinyl butyral material, polyamide material, modified polyamide material, and polyester material can be used. The material, outer diameter, and the like of the center conductor 13 and the outer skin 14 are appropriately determined based on the specifications of contactless power feeding performed between the power feeding device 2 and the power receiving device 5.

  The signal line 12 includes a central conductor 15, an insulating layer 16 that covers the outer periphery of the central conductor 15, an external conductor layer (shield) 17 that covers the outer periphery of the insulating layer 16, and a skin 18 that covers the outer periphery of the shield 17. Are configured as coaxial cables. The center conductor 15 is comprised from the copper material which shape | molded metal materials, such as copper and copper alloy, in the rod shape, for example. The insulating layer 16 is made of, for example, ethylene propylene (EP) rubber, polyethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PAF) resin, tetrafluoroethylene-hexafluoropropylene copolymer (FEP) resin, ethylene-tetrafluoro. It is made of a resin such as an ethylene copolymer (ETFE) resin. The shield 17 is composed of a braided body formed by braiding (knitting) a plurality of strands including, for example, copper, aluminum or the like. The outer skin 18 constituting the outermost periphery of the signal line 12 is made of a material having self-bonding properties. As the material having self-bonding property, for example, a material containing at least one of polyvinyl butyral material, polyamide material, modified polyamide material, and polyester material can be used. The material, outer diameter, and the like of the center conductor 15, the insulating layer 16, the shield 17, and the outer skin 18 are appropriately determined based on the specifications of communication performed between the power feeding device 2 and the power receiving device 5.

  The plurality of power lines 11 are arranged in parallel (flat) on the same plane. In other words, the composite cable 10 is configured as a composite flat cable. That is, the average distance between the plurality of power lines 11 constituting the composite cable 10 is larger than the average distance between the power lines 11 when the plurality of power lines 11 are twisted to form a stranded wire (Litz wire). It is configured as follows.

  The signal line 12 is arranged along a plurality of power lines 11 arranged in parallel on the same plane. FIG. 3A shows a schematic cross-sectional view of the composite cable 10 in the present embodiment, and FIGS. 3B to 3C show modifications thereof.

  The signal line 12 is preferably arranged along the power line 11 arranged on the inner side of the power line 11 arranged on the outermost side among the plurality of power lines 11. That is, it is preferable to arrange the power line 11 instead of the signal line 12 at both ends of the composite cable 10 in the width direction. For example, it is preferable to arrange the signal line 12 as shown in FIG. 3A and FIGS. 3C to 3I, for example, rather than arranging the signal line 12 as shown in FIG. Here, the “width direction” of the multiple cable 10 is “a direction in which the plurality of power lines 11 are arranged” and means “a direction perpendicular to the length direction of the composite cable 10”.

  Further, the signal line 12 is preferably disposed at a position closer to the “central portion in the width direction” of the composite cable 10. For example, the signal line 12 is preferably disposed at a position that is inside the power line 11 that is disposed on the outermost side and is farthest from the power line 11 that is disposed on the outermost side among the plurality of power lines 11. Here, “the center in the width direction” of the composite cable 10 means “the position in the center in the width direction of the composite cable 10”, “the position adjacent to the power line 11 constituting the center in the width direction of the composite cable 10”, “composite cable”. This means one of the positions adjacent to the power line 11 arranged so as to be in the middle in the arrangement order among the plurality of power lines 11 arranged in parallel but not located in the center in the width direction.

  When the number of the power lines 11 is an even number, it is preferable to arrange the signal lines 12 as shown in FIG. 3D, for example, rather than the signal lines 12 as shown in FIG. It is more preferable to arrange as shown in FIG. In the case shown in FIG. 3 (e), the signal line 12 is arranged at “the center position in the width direction of the composite cable 10”. Further, the power line 11 is disposed symmetrically (line symmetrical) in the width direction of the composite cable 10 with the signal line 12 interposed therebetween.

  When the number of the power lines 11 is an odd number, the signal lines 12 are arranged as shown in FIG. 3G, for example, rather than the signal lines 12 as shown in FIG. It is preferable to arrange as shown. In the case shown in FIGS. 3G and 3H, the signal line 12 is arranged at “a position adjacent to the power line 11 constituting the center in the width direction of the composite cable 10”.

  When the number of signal lines 12 is plural, the signal lines 12 may be dispersedly arranged as in this embodiment shown in FIG. In this case, each of the two signal lines 12 is arranged at “a position adjacent to the power line 11 constituting the center in the width direction of the composite cable 10”. Further, the power line 11 is disposed symmetrically (line symmetrical) in the width direction of the composite cable 10 with the signal line 12 interposed therebetween. Further, for example, as in the modification shown in FIG. 3I, a plurality of signal lines 12 may be arranged so as to be adjacent to each other (concentrated at one place). In this case, the two signal lines 12 are “not positioned at the center in the width direction of the composite cable 10, but the power lines 11 arranged so as to be in the middle in the arrangement order among the plurality of power lines 11 arranged in parallel. It will be arranged at “adjacent position”. When a plurality of signal lines 12 are disposed adjacent to each other, at least one of the signal lines 12 may be disposed at the center in the width direction of the composite cable 10 described above.

  As shown in FIG. 2A, the shield 17 included in the signal line 12 is provided (opened) with a plurality of slots 19 for leaking signal radio waves. That is, a signal radio wave emitted from the central conductor 15 is radiated to the shield 17 (signal radio wave is transmitted), or a signal radio wave propagating outside the shield 17 is incident on the central conductor 15 (signal radio wave). A plurality of slots 19 for receiving or receiving a signal are provided with a predetermined shape and a predetermined interval. That is, the signal line 12 is configured as a leaky coaxial cable rather than a simple coaxial cable. As a result, the composite cable 10 not only transmits electric power and electric signals, but also functions as an antenna that transmits and receives signal radio waves.

  In order to increase the transmission / reception efficiency of signal radio waves, the signal radio waves are leaked (radiated or incident) toward the front and back sides of the composite cable 10 as in the present embodiment shown in FIG. It is preferable to provide it as described above. For example, the slot 19 may be provided toward the front and back sides of the composite cable 10 or from the front and back sides within a predetermined angle range. In other words, the slot 19 may be provided so as to be positioned (exposed) at least on the front and back sides of the composite cable 10. Here, the “front and back surfaces” of the composite cable 10 means surfaces determined by the length direction of the power line 11 and the arrangement direction of the power line 11, and means two main surfaces of the composite cable 10. That is, the “front and back surfaces” of the composite cable 10 means a plane on which the plurality of power lines 11 of the composite cable 10 are arranged in parallel. Further, “leaving signal radio waves toward the front and back surfaces of the composite cable 10” means that signal radio waves are leaked at least in the normal direction of the front and back surfaces of the composite cable 10.

  The slot 19 may be provided so as not to face the adjacent power line 11 (or the adjacent signal line 12). Here, “providing not to oppose the adjacent power line 11 (or adjacent signal line 12)” means providing in a direction, shape, and size not opposing the adjacent power line 11 (or adjacent signal line 12). Means. That is, this means that the slot 19 is provided so as not to radiate signal radio waves toward the adjacent power line 11 (or adjacent signal line 12). For example, when the power line 11 and the signal line 12 are arranged on the same plane, and the outer diameter of the central conductor 13 of the power line 11 and the shield 17 of the signal line 12 are the same, the slot 19 is set only in the normal direction of the plane. It may be provided so as to leak the signal radio wave toward the target, or may be provided so as to leak the signal radio wave only in a direction within ± 60 ° from the normal direction.

  However, the mode of the slot 19 is not limited to the case shown in FIG. For example, as in the modification shown in FIG. 2B, the slot 19 is formed with a uniform opening density (opening area of the slot 19 / surface area of the shield 17) over the entire circumference in the outer circumferential direction of the shield (outer conductor layer) 17. It may be provided. Here, “providing the slot 19 over the entire circumference in the outer circumferential direction of the shield 17” means providing the slot 19 in all 360 ° directions with the central conductor 15 of the signal line 12 as the central axis. Further, “providing the slot 19 with a uniform opening density” means providing the slot 19 so that a signal radio wave can be leaked (radiated or incident) with a uniform electric field strength.

  The composite cable 10 is manufactured as follows. In other words, the plurality of power lines 11 each having the outer skin 14 made of a material having self-fusibility are arranged in parallel on the same plane, and the signal line 12 having the outer skin 18 made of a material having self-fusibility is connected to the power line. 11 along. Then, the plurality of power lines 11 and the signal lines 12 are heated in a state of being in close contact with each other or are held for a predetermined time. As a result, the outer skin 14 and the outer skin 18 constituting these outermost circumferences are fused and integrated with each other. Thereafter, the protective layer (sheath) 20 is provided so as to collectively cover the outermost peripheries (outer skin 14 and outer skin 18) of the power line 11 and the signal line 12, thereby completing the manufacture of the composite cable 10 according to the present embodiment. . The sheath 20 can be made of an insulating material having environmental resistance characteristics such as water resistance and oil resistance, such as PVC.

  The primary coil 3 and the secondary coil 4 are each formed by winding the above-described composite cable 10 in a predetermined shape a predetermined number of times. The shapes and diameters of the coils 3 and 4, the number of turns of the composite cable 10, and the like are appropriately determined based on the specifications of contactless power feeding and communication performed between the power feeding device 2 and the power receiving device 5. When winding the composite cable 10, the bending direction of the composite cable 10 is not particularly limited. That is, the front and back surfaces of the composite cable 10 may be bent so as to be bent, or the width direction end portion of the composite cable 10 may be bent.

(Power supply device)
As shown in FIG. 4, the power feeding device 2 is connected to the end of the power line 11 constituting the primary coil 3 formed by the composite cable 10 described above, and the output from the DC power source 21 is supplied to the primary coil (feeding coil) 3. A power feeding circuit 22 is provided. The power feeding device 2 is connected to the end of the signal line 12 constituting the primary coil 3, uses the primary coil 3 as an antenna, and transmits, for example, a control signal related to non-contact power feeding to the power receiving device 5. The unit 23 is provided. The power feeding device 2 includes an antenna 31 that receives a signal radio wave radiated from the secondary coil 4 and a receiver 32 that extracts a control signal and the like from the signal radio wave received by the antenna 31.

  The power supply circuit 22 includes transistors 24a to 24d, diodes 40a to 40d, a smoothing capacitor 41, a resonance capacitor 6, an inductance 42, a power supply side power supply control unit 33, and the like. The power feeding circuit 22 is configured to feed rectangular wave power to the primary coil 3. Specifically, the power supply circuit 22 is supplied from the DC power supply 21 by controlling the power supply side power supply control unit 33 and switching the ON state and the OFF state of the four transistors 24a to 24d at a predetermined timing. It is configured as a rectangular wave inverter circuit capable of converting DC power into rectangular wave (square wave) AC power. The power feeding circuit 22 is configured to freely control the frequency of the power supplied to the primary coil 3 by adjusting the number of times of switching the ON / OFF of these four transistors 24a to 24d. Yes. The frequency of the power supplied from the power supply circuit 22 to the primary coil 3 can be set to a high frequency band of, for example, 10 kHz to several hundred MHz. Furthermore, the power feeding circuit 22 efficiently converts the induced electromotive force obtained from the primary coil 3 into DC power by operating the diodes 40a to 40d, the smoothing capacitor 41, the resonance capacitor 6, the inductance 42, and the like. It is also configured as an AC / DC converter that can. That is, the power feeding circuit 22 is also configured to function as a power receiving circuit that receives the induced electromotive force from the primary coil 3.

  The power feeding circuit 22 is configured to feed power having a waveform that does not include the frequency component of the electrical signal flowing through the signal line 12 to the power line 11. For example, the power supply circuit 22 is configured to supply the power line 11 with power having a waveform that does not include a frequency component of a control signal related to non-contact power supply, that is, a frequency component of 1 GHz to several tens of GHz. For this reason, the waveform of the power supplied by the power feeding circuit 22 is not a waveform having a large (steep) change per unit time in the rising portion and the falling portion as shown in FIG. 5, but as shown in FIG. The change per unit time of the rising part and the falling part is a small (gradual) dull waveform. The waveform of the power supplied from the power feeding circuit 22 is not only the frequency component of which does not include the frequency component of the frequency band of the control signal, but also the harmonic component of the waveform that does not include the frequency component of the frequency band of the control signal. It is preferable to do.

  The power supply side communication control unit 23 is connected to the signal line 12 to constitute a high frequency signal line 25 as shown in FIG. In the high frequency signal line 25, the voltage appearing at both ends of the output of the high frequency signal source 26 and the termination resistor 27 is the voltage (electromotive force) generated by the high frequency signal source 26 and the output impedance of the high frequency signal source 26 and the termination resistor 27. The pressure is divided by. In the high-frequency signal line 25, 1/2 of the electromotive force of the high-frequency signal source 26 is applied to the signal line 12 (the central conductor 15 of the coaxial cable (leakage coaxial cable)) and the terminating resistor 27, and a current corresponding to the voltage flows. It is configured as follows. As described above, the signal frequency transmitted by the high-frequency signal line 25, that is, the frequency of the control signal related to the non-contact power feeding can be set to a high frequency band of 1 GHz to several tens GHz, for example. The control signal transmitted by the high-frequency signal line 25, that is, the waveform of the electrical signal transmitted from the high-frequency signal source 26 to the signal line 12, can be a sine wave or a rectangular wave.

  The receiver 32 includes a tuning circuit that extracts a control signal and the like from the signal radio wave received by the antenna 31. The receiver 32 is configured to extract a control signal or the like from the signal radio wave transmitted from the secondary coil 4 and transmit the extracted control signal or the like to the power supply side communication control unit 23 or the like.

(Power receiving device)
The power receiving device 5 is connected to the end of the power line 11 constituting the secondary coil 4 formed by the composite cable 10 described above, and is induced by the secondary coil 4 (obtained from the secondary coil 4). Is provided with a power receiving circuit 29 for supplying the power to a load 28 such as a battery. The power receiving device 5 is connected to the end of the signal line 12 constituting the secondary coil 4, uses the secondary coil 4 as an antenna, and transmits, for example, a control signal related to non-contact power feeding to the power feeding device 2. A communication control unit 30 is provided. The power receiving device 5 includes an antenna 34 that receives a signal radio wave radiated from the primary coil 3, and a receiver 35 that extracts a control signal and the like from the signal radio wave received by the antenna 34.

  The power receiving circuit 29 includes transistors 43a to 43d, diodes 36a to 36d, a smoothing capacitor 37, a resonance capacitor 7, an inductance 38, and a power receiving side power supply control unit 44. The power receiving circuit 29 is configured to receive the induced electromotive force from the secondary coil 4. Specifically, the power receiving circuit 29 operates the four diodes 36a to 36d, the smoothing capacitor 37, the resonance capacitor 7, the inductance 38, and the like to convert the induced electromotive force obtained from the secondary coil 4 into DC power. It is configured as an AC / DC converter circuit capable of converting into Furthermore, the power receiving circuit 29 can convert the DC power into rectangular wave AC power by controlling the power receiving side power supply control unit 44 and switching the ON state and OFF state of the transistors 43a to 43d at a predetermined timing. It is also configured as a rectangular wave inverter circuit. That is, the power receiving circuit 29 is also configured to function as a power feeding circuit that feeds rectangular wave power to the secondary coil 4.

  The power reception side communication control unit 30 is configured in the same manner as the power supply side communication control unit 23 described above. That is, the power receiving side communication control unit 30 is configured to transmit a signal from the high frequency signal source 39 to the signal line 12 and to transmit a signal radio wave using the secondary coil 4 as an antenna.

  The receiver 35 is configured similarly to the receiver 32 described above. That is, the receiver 35 is configured to be able to extract a control signal or the like from the signal radio wave transmitted from the primary coil 3 and transmit the extracted control signal or the like to the power receiving side communication control unit 30 or the like. .

(2) Operation of contactless power supply / reception system The operation of the contactless power supply / reception system 1 will be described below.

  First, the power feeding device 2 transmits a control signal (for example, a request signal for starting charging) to the power receiving device 5 via the signal line 12 constituting the primary coil 3. The power receiving device 5 that has received the control signal from the power feeding device 2 via the antenna 34 transmits the control signal (a response signal to the control signal from the power feeding device 2, for example, charging, via the signal line 12 constituting the secondary coil 4). Startable signal, charging start impossible signal, etc.) are transmitted to the power feeding device 2.

  The power feeding device 2 that has received the control signal from the power receiving device 5 via the antenna 31 starts transmitting high-frequency power to the power line 11 that constitutes the primary coil 3. When high-frequency power is transmitted from the power feeding device 2, the primary coil 3 is excited and a magnetic field is formed around the primary coil 3. In response to a change in the magnetic field generated by the primary coil 3, an induced electromotive force is excited in the secondary coil 4. The power receiving device 5 receives the induced electromotive force excited by the secondary coil 4 via the power line 11 that constitutes the secondary coil 4. The power receiving device 5 supplies (transmits) the received induced electromotive force to a load 28 (see FIG. 4) such as a battery.

  The power receiving device 5 transmits a control signal (for example, a signal indicating completion of charging) to the power feeding device 2 via the signal line 12 configuring the secondary coil 4. At this time, transmission / reception of a control signal between the power receiving device 5 and the power feeding device 2 is performed simultaneously with power transmission without interrupting power transmission from the power feeding device 2 to the power receiving device 5. That is, power transmission from the power feeding device 2 to the power receiving device 5 and transmission / reception of a control signal between the power feeding device 2 and the power receiving device 5 are performed simultaneously. The power feeding device 2 that has received the control signal from the power receiving device 5 via the antenna 31 stops high-frequency power transmission to the power line 11 that constitutes the primary coil 3.

(3) Effects of the present embodiment According to the present embodiment, the following one or more effects are achieved.

(A) Power transmission efficiency in the entire composite cable 10 can be increased by using a plurality of power lines 11 that constitute the composite cable 10 instead of one. In other words, by using a plurality of power lines 11, the ratio of the surface area to the cross-sectional area of the entire power line 11 can be increased. As a result, as with the litz wire, the influence on the power transmission efficiency due to the skin effect can be reduced, and the power transmission efficiency of the composite cable 10 as a whole can be increased.

(B) By arranging the plurality of power lines 11 in parallel on the same plane, the power transmission efficiency of the composite cable 10 as a whole can be further increased. That is, since the plurality of power lines 11 are arranged flat, the average distance between the power lines 11 can be made larger than the average distance between the power lines 11 when the plurality of power lines 11 are twisted to form a litz wire. . Thereby, the influence of a proximity effect can be reduced compared with a litz wire. As a result, the substantial electrical resistance value of the entire composite cable 10 can be reduced, and the power transmission efficiency can be further increased.

(C) Since the place where the signal line 12 is disposed is devised, the power transmission efficiency of the composite cable 10 as a whole can be further increased.

  This is because when high-frequency power is simultaneously applied to the power lines 11 arranged in parallel on the same plane, a difference occurs in the value of current flowing through each of the power lines 11 due to the proximity effect. Specifically, the power line 11 arranged on the outermost side among the plurality of power lines 11 has the maximum current amount, and the current amount gradually decreases toward the center in the width direction of the composite cable 10 and is arranged at the center. In the power line 11, the amount of current is minimized. Here, if the signal line 12 is arranged in the vicinity of the power line 11 having a large amount of current, a large eddy current flows on the surface of the signal line 12, and the power transmission efficiency of the composite cable 10 as a whole is reduced. There is. That is, when the signal line 12 including a conductor that does not contribute to power transmission is disposed in the vicinity of the power line 11 that generates a strong magnetic field in the periphery, a large eddy current flows through the conductor, and transmission energy is wasted. The power transmission efficiency of the composite cable 10 as a whole may be reduced.

  On the other hand, in this embodiment, since the signal line 12 is disposed along the power line 11 disposed on the inner side of the power line 11 disposed on the outermost side among the plurality of power lines 11, the above-described problem is solved. be able to. In particular, by arranging the signal line 12 at the center in the width direction of the composite cable 10, it is possible to maximize the power transmission efficiency of the composite cable 10 as a whole.

(D) Even when the number of power lines 11 is an odd number, the signal lines 12 are sandwiched and the width of the composite cable 10 is symmetric with respect to the signal line 12 as in the present embodiment shown in FIG. By arranging the power line 11, when high frequency power is transmitted to the composite cable 10, a symmetric magnetic field can be formed around the composite cable 10, that is, across the width direction of the composite cable 10. As a result, it is easy to align the strength distribution characteristics of the magnetic field generated by the non-contact power feeding coil formed by the composite cable 10, that is, the power feeding efficiency on the front and back surfaces of the coil. Even when the number of power lines 11 is an even number, for example, by arranging the signal lines 12 as in the modification shown in FIG. 3E, the same effect can be obtained.

(E) When a plurality of signal lines 12 are provided, these signal lines 12 are arranged so as to be adjacent to each other (concentrated in one place) as in the modification shown in FIG. By doing so, each line can be easily routed and the reliability can be improved. That is, when each of the power line 11 and the signal line 12 is pulled out from the composite cable 10 and connected to the power feeding device 2 or the power receiving device 5, the number of three-dimensional intersections of some of the power lines 11 and the signal lines 12 can be reduced. The above-described effects can be obtained.

(F) Since the power line 11 and the signal line 12 are integrated, it is not necessary to separately arrange the power line 11 and the signal line 12 between the power feeding device 2 and the power receiving device 5. As a result, the cable laying cost and the like can be reduced. In addition, by integrating the power line 11 and the signal line 12, it is possible to make room for the mounting space in the power feeding device 2 and the power receiving device 5, and to increase the degree of freedom in designing these devices. Become.

(G) Since the signal line 12 is composed of a leaky coaxial cable, the composite cable 10 can be used not only for transmission of electric power and electric signals but also as an antenna for transmitting and receiving signal radio waves.

(H) Since the frequency component of the power transmitted through the power line 11 does not include the frequency component of the electrical signal transmitted through the signal line 12 (for example, a control signal related to non-contact power feeding), the power and the electrical signal interfere with each other. Therefore, it is possible to simultaneously transmit power and transmit / receive electric signals. It is also possible to improve communication quality and improve reliability. This is particularly effective when the signal line 12 is configured by a leaky coaxial cable as in the present embodiment, that is, when the signal line 12 also functions as an antenna. In the present embodiment, since power feeding and communication can be performed simultaneously, power transmission from the power feeding device 2 to the power receiving device 5 is performed when the control signal is transmitted and received between the power receiving device 5 and the power feeding device 2. There is no need to interrupt the power supply, and the power supply efficiency and the communication efficiency can be increased. In addition, since the power supply device 2 and the power reception device 5 do not need a function such as switching that switches between power reception and communication in a time-sharing manner, it is possible to reduce the device cost.

(I) As shown in FIG. 2A, since the slot 19 is provided so as to leak signal radio waves toward the front and back surfaces of the composite cable 10, transmission / reception of signal radio waves from the composite cable 10 is efficient. Will be able to do it. In particular, by providing the slot 19 toward the front and back sides of the composite cable 10, the efficiency of signal radio wave transmission / reception can be maximized. As a result, it is possible to improve communication quality and reliability when the composite cable 10 is used as an antenna.

  Further, as shown in FIG. 2A, since the slot 19 is provided so as not to face the adjacent power line 11 (or the adjacent signal line 12), the signal line 12 is connected to the center of the adjacent power line 11 (the center of the adjacent power line 11). Signal radio waves are not radiated in a direction that may be absorbed or scattered by the conductor 13) or the like. That is, the signal radio wave is not radiated in a useless direction (for example, toward the adjacent power line 11 or the like). Thereby, attenuation of the control signal flowing through the signal line 12 (center conductor 15) can be suppressed, and the transmission distance (electric signal transmission distance, i.e., communication distance) of wired communication can be further expanded to improve communication quality and reliability. Can be further improved. Further, the central conductor 15 of the signal line 12 is less likely to receive an electromagnetic wave radiated from the adjacent power line 11 or a signal radio wave radiated from the adjacent signal line 12. As a result, noise flowing through the central conductor 15 of the signal line 12 can be reduced (S / N ratio can be increased), communication quality can be improved, and reliability can be improved.

(J) Further, as in the modification shown in FIG. 2B, when the slot 19 is provided with an equal opening density over the entire circumference of the shield (outer conductor layer) 17, the composite cable 10 is manufactured. In doing so, it becomes easy to position the slot 19 so that the plurality of power lines 11 leak signal radio waves toward the front and back sides of the composite cable 10. That is, when the signal line 12 is arranged along the power line 11, the slot 19 is formed on the front and back surfaces of the composite cable 10 without adjusting the angle of the signal line 12 when the central conductor 15 is the central axis (rotation axis). Can be easily positioned so that is always positioned. Further, even when the signal line 12 arranged along the power line 11 is twisted in the middle, the slot 19 is always stably arranged on the front and back sides of the composite cable 10. That is, it becomes easy to make the radiation characteristics and reception characteristics of signal radio waves uniform over the longitudinal direction of the composite cable 10. In addition, the production yield of the composite cable 10 can be increased.

(K) Since the outermost circumferences of the power line 11 and the signal line 12 are each made of a material having self-bonding properties, the manufacturing cost of the composite cable 10 can be reduced. That is, when manufacturing the composite cable 10, it is not necessary to use an adhesive tape or the like for fixing the power line 11 and the signal line 12. Thereby, the number of parts and the manufacturing process of the composite cable 10 can be reduced, and the manufacturing cost can be reduced.

<Other embodiments>
The embodiment of the present invention has been specifically described above. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, the signal line 12 is not limited to being arranged on the same plane as the power line 11. For example, as shown in FIG. 3 (h), only the power line 11 may be arranged on the same plane, and the signal line 12 may be brought close to the power line 11 constituting the center of the composite cable 10 in the width direction. That is, the above-described operation and effect can be obtained by arranging at least a plurality of power lines 11 on the same plane.

  Further, for example, the number of power lines 11 and signal lines 12 is not limited to the above-described embodiment. These numbers are appropriately determined based on specifications of contactless power feeding and communication performed between the power feeding device 2 and the power receiving device 5, and further mounting conditions in the power feeding device 2 and the power receiving device 5.

  Moreover, in the above-mentioned embodiment, although the electric power line 11 was comprised with the enamel covering wire, this invention is not limited to the form which concerns. For example, each power line 11 may be configured as a bare wire that does not have the outer skin 14 (the surface of the central conductor 13 is exposed). Further, for example, each power line 11 may be constituted by a stranded wire obtained by twisting bare wires. Further, for example, each power line 11 may be configured as a litz wire formed by twisting a plurality of enamel-coated wires. When each power line 11 is configured as a litz wire, the ratio of the surface area to the cross-sectional area of the entire power line 11 can be further increased, and it is possible to further suppress a decrease in power transmission efficiency due to the skin effect. Further, when each power line 11 is configured as a stranded wire such as a litz wire, the flexibility of the composite cable 10 can be enhanced.

  Moreover, in the above-mentioned embodiment, although the signal wire | line 12 was comprised with the leaky coaxial cable, this invention is not limited to the form which concerns. For example, the signal line 12 may be configured as a non-leakage coaxial cable. Further, the signal line 12 may be configured as a covered electric wire constituted by the central conductor 15 and the outer sheath 18, a twisted pair of these, or the like. That is, the present invention can be suitably applied when the signal line 12 includes a conductor that does not contribute to the transmission of high-frequency power for contactless power feeding. In these cases, the same effect as the above-described embodiment can be obtained. can get. Moreover, you may comprise the center conductor 15 from the copper material which shape | molded metal materials, such as copper and a copper alloy, in the shape of a hollow pipe.

  Moreover, in the above-mentioned embodiment, although the waveform of the electric power for non-contact electric power feeding was made into the rectangular wave, this invention is not limited to the form which concerns. For example, the waveform of the non-contact power supply power may be a sine wave. That is, when the frequency of the power for contactless power supply does not include the frequency component of the electrical signal, the same effects as those of the above-described embodiment such as improvement of communication quality and improvement of reliability can be obtained.

  In the above-described embodiment, the outermost circumference of each of the plurality of power lines 11 and the outermost circumference of the signal line 12, that is, the outer skin 14 of the power line 11 and the outer skin 18 of the signal line 12 are made of a material having self-bonding properties. The present invention is not limited to such a form. It is sufficient that at least the outermost periphery of the signal line 12 is made of a material having self-bonding properties. In other words, by heating the signal line 12 and the power line 11 adjacent to the signal line 12 in close contact with each other or holding them for a predetermined time, at least the outermost periphery of the signal line 12 and the outermost of the power line 11 adjacent to the signal line 12 are stored. The outer periphery can be fused, and the manufacturing cost of the composite cable 10 can be reduced. Further, the outer skin 14 of the power line 11 and the outer skin 18 of the signal line 12 may each be made of a material that does not have self-bonding properties. For example, the outer sheath 14 of the power line 11 and the outer sheath 18 of the signal line 12 are made of ethylene propylene (EP) rubber, polyethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PAF) resin, tetrafluoroethylene-hexafluoropropylene copolymer, respectively. You may comprise with resin, such as a polymer (FEP) resin and ethylene-tetrafluoroethylene copolymer (ETFE) resin.

  Moreover, in the above-mentioned embodiment, although the primary coil 3 and the secondary coil 4 were each comprised with the composite cable 10, this invention is not limited to the form which concerns. For example, the present invention can be suitably applied to the case where only the primary coil 3 is constituted by the composite cable 10 or the case where the secondary coil 4 is constituted by the composite cable 10.

  Further, the electric signal transmitted by the signal line 12 is not limited to the control signal for non-contact power feeding. The present invention is preferably applied to the case where other electrical signals other than the contactless power supply control signal are transmitted and also when only other electrical signals are transmitted without transmitting the contactless power supply control signal. Is possible.

  In the above-described embodiment, the braided body is used as the shield (external conductor layer) 17, but the present invention is not limited to such a form. For example, the shield 17 may be made of a metal tape containing a metal such as copper. That is, the shield 17 may be configured by winding a metal tape around the insulating layer 16. At this time, if a metal tape having a predetermined opening is used, the slot 19 can be provided by winding the metal tape around the insulating layer.

  In addition, for example, the power supply circuit 22 may be configured to supply power having a waveform that does not include the frequency component of the electric signal when at least power supply and electric signal transmission are performed at the same time. That is, when electric signals are not transmitted to and received from the primary coil 3, the power waveform supplied from the power supply circuit 22 to the primary coil 3 is not a blunt rectangular wave as shown in FIG. Such a rectangular wave may be used.

  In addition, for example, the present invention can also be suitably applied when the composite cable 10 further includes a conductor wire (for example, a reinforcing metal wire) other than the power line 11 and the signal line 12. That is, by arranging a conductor that does not contribute to the transmission of high-frequency power at the same position as the signal line 12, the above-described effects can be obtained.

  In the above-described embodiment, the example in which the primary coil 3 and the secondary coil 4 are used as signal radio wave transmission antennas has been described. However, the present invention is not limited to this mode. For example, at least one of the primary coil 3 and the secondary coil 4 can be used as an antenna for receiving signal radio waves. That is, the composite cable 10 according to the above-described embodiment can be suitably used not only for transmission of signal radio waves but also for reception. In this case, the antennas 31 and 34, the receivers 32 and 35, and the like can be omitted, and the structure of the non-contact power receiving and feeding system 1 can be simplified and the manufacturing cost can be reduced.

  Next, examples of the present invention will be described, but the present invention is not limited thereto.

(Sample preparation)
Seven power lines were arranged in parallel on the same plane, and one signal line was arranged along one of the seven power lines to produce four types of composite cables. These were designated as samples 1 to 4, respectively. Further, a flat cable was manufactured by arranging seven power lines in parallel on the same plane, and this was used as reference sample 1. In addition, eight power lines were arranged in parallel on the same plane, and one signal line was arranged along one of the eight power lines to produce five types of composite cables. These were designated as Samples 5 to 9, respectively. Further, a flat cable was produced by arranging eight power lines in parallel on the same plane, and this was used as reference sample 2.

(Evaluation of electrical characteristics of composite cable)
About each sample of the samples 1-9 and the reference samples 1-2, the electric power of the various frequency of the range of 10 kHz-10000 kHz was transmitted to each sample to each power line with which each sample is provided. And the resistivity (electric resistance value) of each whole sample (the whole composite cable or the whole flat cable) at each frequency was measured. The results are shown graphically in FIG. 8 for samples 1 to 4 and reference sample 1, and in FIG. 9 for samples 5 to 9 and reference sample 2, respectively. 8 and 9, the horizontal axis represents the frequency (kHz) of power, and the vertical axis represents the measured resistance value (electric resistance value) (mΩ / m). In FIG. 8, □, Δ, ×, + indicate Samples 1 to 4, respectively, and ◇ indicates Reference Sample 1. In FIG. 9, □, Δ, ×, +, and ● represent Samples 5 to 9, and ◇ represents Reference Sample 2. In FIG. 8 and FIG. 9, the ◯ marks indicate power lines, and the ◎ marks indicate signal lines.

  From FIG. 8 and FIG. 9, it was confirmed that the resistance value decreases as the signal line is arranged closer to the center in the width direction of the composite cable. In other words, as the signal line is arranged closer to the center part in the width direction of the composite cable, the resistance value of the entire composite cable approaches the resistance value of the reference sample 1 or the reference sample 2 that is a flat cable that does not include the signal line. It was confirmed that the transmission efficiency could be maximized. In other words, if a signal line is placed in the vicinity of a power line with a large amount of current, a large eddy current will flow on the surface of the signal line, which may reduce the transmission efficiency of the entire composite cable. confirmed.

10 Composite cable 11 Power line 12 Signal line

Claims (7)

A plurality of power lines for transmitting high-frequency power for contactless power feeding;
A signal line arranged along the power line and transmitting an electrical signal,
The composite cable, wherein at least the plurality of power lines are arranged in parallel on the same plane. 2. The composite cable according to claim 1, wherein the signal line is disposed along a power line disposed inside an outermost power line among the plurality of power lines. 3. The composite cable according to claim 1, wherein the signal line is disposed at a central portion in the width direction of the composite cable. The signal line is disposed inside a power line disposed on the outermost side among the plurality of power lines and at a position farthest from the power line disposed on the outermost side. Item 4. The composite cable according to any one of Items 1 to 3. The composite cable according to claim 1, wherein the plurality of power lines are arranged symmetrically in the width direction of the composite cable with the signal line interposed therebetween. A plurality of the signal lines;
The composite cable according to claim 1, wherein the plurality of signal lines are collectively arranged so as to be adjacent to each other. It forms by winding the composite cable in any one of Claims 1-6. The coil for non-contact electric power feeding / receiving characterized by the above-mentioned.