JP6485336B2 - electric circuit - Google Patents

Description

  The present invention relates to a coil device including a plurality of coils, and more particularly to a wiring structure of conductive wires connected to the coils. The present invention also relates to an electric circuit including the coil device.

  In a system including a rotating body that can rotate around an axis, if the path for supplying power to the rotating body is configured by a cable made of a conductor, the cable is twisted following the rotation of the rotating body. Therefore, flexibility that can withstand deformation due to this is required. Therefore, an expensive conducting wire is required, and the system construction cost is high. Further, if the rotation angle of the rotating body is large or the operating environment of the system is high temperature and high pressure, even a highly flexible cable may not be able to endure and may be damaged.

  In order to avoid twisting of the cable, a method of providing a contact made of a slip ring and a brush in the power supply path may be employed. However, this method causes wear on various parts due to mechanical friction between the slip ring and the brush, so maintenance that involves periodically checking the condition of wear and replacing parts as necessary. Work has to be done, and the cost of maintenance and inspection is high.

  Therefore, as described in Patent Document 1, a method of using a non-contact power feeding device using an electromagnetic induction action may be employed. With this method, the power transmission / reception conductor is not twisted, and the wear of various parts can be relatively small, so that the system construction cost and the maintenance inspection cost can be kept low.

  The non-contact power feeding device described in Patent Document 1 uses an electromagnetic coil wound around a core, and as a primary side core and a secondary side core to be wound around the electromagnetic coil, Also, a so-called pot-shaped core with a bottom having a cylindrical peripheral wall and a protruding portion protruding from the axial center portion is used. The dimensions of the projecting portion and the peripheral wall of the pot-shaped core are required to be larger than the dimensions required to wind the conductors corresponding to the number of turns of the electromagnetic coil. For this reason, if an electromagnetic coil having a large number of turns is used to supply a large amount of power, the dimensions of the core also increase, and the non-contact power supply apparatus occupies a large space.

  Therefore, in order to save space, a coil substrate having a conductor mounted on a flat substrate surface, a so-called planar coil may be used. For example, when a disk-shaped coil substrate 92 as shown in FIG. 6 is used, a core 94 made of a magnetic material such as ferrite formed in a cylindrical shape having the same diameter as the outer diameter of the coil substrate 92 is prepared. The core 94 upper surface is attached to the lower surface (back side) in the figure. In this way, the magnetic flux generated when a current is about to flow through the front side coil 92a mounted on the upper surface (front side) of the coil substrate 92 in the figure passes through the core 94, which is similar to a conventional electromagnetic coil. Further, it can be used as a coil having electromagnetic performance equivalent to a coil having a structure in which a conductor is wound around a core.

  Such a surface mount type coil substrate 92 and its core 94 can be made smaller in size than a coil having a structure in which a conducting wire is wound around a pot type core. The occupied space can be reduced. In addition, when winding a conducting wire around the core, it is difficult to stably produce a plurality of coils with the same quality. However, if the surface mounting type coil substrate 92 is used, it is possible to apply a printed circuit board manufacturing technique or the like. Easy to manufacture at low cost with stable quality.

  Further, as shown by a broken line in FIG. 6 as well as the upper surface of the coil substrate 92, if the back side coil 92b is mounted on the lower surface (back side) of the coil substrate 92, one coil substrate 92 includes two coils. Therefore, the two coils are connected in series so that the entire coil substrate 92 is used as one coil having a large inductance value, or the entire coil substrate 92 is connected in parallel to be one coil having a small inductance value. Or can be used as Further, when connected in parallel, the DC resistance of the entire coil substrate 92 is reduced. For this reason, in the non-contact power feeding device, the current on the secondary side can be increased by using the coil substrate 92 connected in series on the primary side and the coil substrate 92 connected in parallel on the secondary side. it can. In this way, even if the same coil substrate 92 is used, the electromagnetic properties of the entire coil substrate can be changed simply by changing the wiring method. Therefore, coils having different electromagnetic properties on the primary side and the secondary side can be obtained. Even when it is desired to use, the same type of coil substrate 92 can be used on the primary side and the secondary side, and the material procurement cost for manufacturing the non-contact power feeding device can be kept low.

Japanese Patent No. 3815626

  However, in the combination of the coil substrate 92 and the core 94 shown in FIG. 6, the distance to the core 94 is different between the front coil 92a and the back coil 92b. That is, the distance between the front side coil 92a and the core 94 is larger by the thickness of the coil substrate 92 than the back side coil 92b. Therefore, even if the front coil 92a and the back coil 92b have the same shape, inductance values as inductor elements are different from each other. Therefore, even if the front side coil 92a and the back side coil 92b are connected to a common power source, the front side coil 92a and the back side coil 92b have different AC performance.

  This problem is particularly noticeable when the front coil 92a and the back coil 92b are connected in parallel. In the coil substrate 92 in which the front side coil 92a and the back side coil 92b have the same shape (the same shape in FIG. 6 and opposite in direction), if the distance between the front side coil 92a and the back side coil 92b is the same as the core 94 When a common AC power source is connected in parallel to the front coil 92a and the back coil 92b, the currents flowing in the front coil 92a and the back coil 92b should be equal. However, in reality, currents having different strengths flow between the front side coil 92a and the back side coil 92b due to the difference in inductance value caused by the distance from the core 94 being different. For example, even if a current of 1 A is applied to the entire circuit and a current of 0.5 A is supplied to both coils, a current of 0.7 A flows through one coil and a current of 0.3 A flows through the other coil. A situation occurs in which current flows.

  One of the countermeasures against the problem that the current intensity becomes uneven between the two coils connected in parallel is to use a magnetic core for equalizing the current. Can be mentioned. For example, as shown in the schematic circuit diagram of FIG. 7, one lead wire connected to the end portion of the front coil 92 a and one lead wire connected to the end portion of the back coil 92 b, one each inside the cylindrical equalizing core 96 The two conductors are arranged so that the current Ia flowing through the front coil 92a and the current Ib flowing through the back coil 92a face each other in the cylinder of the equalizing core 96. In this way, even if the intensity of the current flowing through both coils is uneven, the currents Ia and Ib facing each other in the cylinder of the equalizing core 96 act so that the magnetic fluxes generated by each other are in an equilibrium state. . That is, the currents Ia and Ib flowing through the two conductors act so that the magnetic fluxes generated in the equalizing core 96 are opposite to each other with the same strength, and the stronger current is weakened and the weaker one is weakened. The current is increased, and as a result, both currents Ia and Ib have the same strength. Thereby, the strength of the current flowing through both coils is equalized.

  However, when such an equalizing core 96 is prepared separately from the coil substrate 92 and the core 94, the equalizing core 96 is arranged in spite of using the coil substrate 92, that is, a planar coil, for space saving. In order to do so, extra space must be reserved.

Therefore, an object of the present invention is to provide a coil device that does not require an equalization core prepared separately from the coil device and can save space.
Further, the present invention provides an electric circuit including a coil device that can equalize currents flowing in a plurality of coils included in the coil device without an equalization core prepared separately from the coil device. It is an issue to provide.

In order to solve this problem, an electric circuit according to the present invention is an electric circuit including a coil device , and the coil device includes a coil substrate including at least two coils, and a coil substrate attached to the coil substrate. a core made of a common core, possess a terminal lead connected to each end of the coil, the core is the core through holes provided to penetrate the core itself, of the terminal conductor , At least two terminal conductors respectively connected to separate coils are passed through the core through hole, and at least a pair of two coil pairs are connected in parallel to form a parallel coil circuit. The plurality of terminal conductors which are parallel coil pairs and are passed through the core through-holes are a set of two terminal conductors connected to each of the coils constituting the parallel coil pair. At least one set of through parallel lines, and each of the terminal conductors of the through parallel lines has the core when an alternating current flows in a parallel coil circuit formed by a parallel coil pair to which the pair of through parallel lines is connected. In the through hole, wiring is performed such that currents in opposite directions flow .
According to this configuration, even if an equalizing core is not provided separately from the coil device, wiring is performed so that the core surrounds at least two terminal conductors connected to separate coils. It will be.
In addition, according to this configuration, since the two terminal conductors through which currents flowing in opposite directions flow are surrounded by the core, the current flowing through the set of two terminal conductors (through parallel lines) The generated magnetic fluxes are opposite to each other, and the current flowing in each of the two terminal conductors, that is, the through parallel lines, is equalized to the same strength by the same phenomenon as the current equalization in the cylinder of the equalization core. .

In addition to the above configuration, the coil device for an electric circuit according to the present invention is provided with a coil substrate through-hole penetrating in the plate thickness direction in the coil substrate, and the terminal conductor passed through the core through-hole is It may be passed through the coil substrate through-hole.
According to this configuration, even when the core is attached to one side (back side) of the coil substrate and the terminal lead is connected to the other side (front side), the terminal lead is placed on the front side by passing the terminal lead through the coil substrate through hole. Therefore, the terminal conductor can be passed through the core through hole existing on the back side.

In addition to the above configuration, the coil device of the electric circuit according to the present invention has a spiral shape in which each coil included in the coil substrate surrounds the coil substrate through hole. The coil substrate through hole and the core through hole The end portion of the coil to which the terminal conducting wire passed through is connected may be located at the peripheral edge of the coil substrate through hole.
According to this configuration, the terminal conductors passed through the coil substrate through hole and the core through hole are arranged on the coil substrate from the end of the coil located at the peripheral edge of the coil substrate through hole, that is, from the position close to the coil substrate through hole. Since it is passed through the through hole, the path through which the terminal conducting wire passes from the coil end to the coil substrate through hole can be shortened. Therefore, the wiring space necessary for routing the terminal conductors can be reduced, and space saving can be achieved. Moreover, the terminal conductor can be shortened and the material cost of the coil device can be suppressed.
Furthermore, since the coil included in the coil substrate has a spiral shape surrounding the coil substrate through hole, the direction of the magnetic flux generated when the coil is energized is parallel to the through direction of the coil substrate through hole. On the other hand, the direction of the magnetic flux generated when the terminal conducting wire passed through the coil substrate through hole is energized is perpendicular to the direction of penetration of the coil substrate through hole. Therefore, the direction of the magnetic flux generated from the terminal conducting wire passed through the coil substrate through-hole when the coil device having this structure is energized is perpendicular to the magnetic flux generated from the coil. Then, since the magnetic flux generated from the terminal lead wire passed through the coil substrate through hole does not directly affect the magnetic flux generated from the coil, the magnetic flux generated from the coil is disturbed. Can be prevented.

In addition to the above configuration, the coil device for an electric circuit according to the present invention includes at least a pair of coil pairs each including two planar coils whose winding directions are opposite to each other. The two planar coils forming the coil pair may overlap with each other in the plate thickness direction of the coil substrate, and may be separated from each other by an insulating layer.
According to this configuration, by passing the terminal conductors connected to each of the two planar coils constituting the coil pair one by one through the core through hole, the winding directions are opposite to each other, that is, the electromagnetic polarities are opposite to each other. Terminal conductors connected to each of the two planar coils are passed through the core through-holes one by one, so that reverse current flows between the terminal conductors passed through the core through-holes. Wiring is easy.

In the electric circuit according to the present invention, in addition to the above configuration, the first coil and the second coil form a parallel coil pair, and the winding start end of the first coil and the second coil The coil winding start end is electrically connected, and the winding end end of the first coil and the winding end end of the second coil are electrically connected to form a parallel coil circuit. And a set of terminal conductors connected to the winding end of the first coil and terminal conductors connected to the winding start of the second coil is a through parallel line. You may do it.
According to this structure, it can wire so that the electric current which flows into two penetration parallel lines may become a mutually reverse direction in a core through-hole.

Moreover, in addition to the above configuration, the electric circuit according to the present invention is used as a coil device on a power feeding side or a power receiving side used for contactless power feeding of a mechanical device including a rotating body. The core is provided with a rotating shaft hole for passing the rotating shaft of the rotating body, and the rotating shaft hole may be used as a through hole for passing a through parallel line.
According to this configuration, when the rotary shaft hole is previously provided in the core in the existing contactless power supply system, the through hole for passing the through parallel line is opened again when forming the electric circuit according to the present invention. There is no need, and the electric circuit according to the present invention can be easily formed in an existing system.

According to the coil device according to the present invention, wiring is performed in such a manner that the core surrounds at least two terminal conductors respectively connected to separate coils, so that an equalized core separate from the coil device is not prepared. In both cases, since the core surrounding the terminal conducting wire is disposed, it is not necessary to provide an additional equalizing core when the coil device is incorporated in an electric circuit, and space can be saved.
In addition, according to the electric circuit of the present invention, the currents flowing through each pair of through parallel lines passing through the core through hole are equalized to the same strength. The current flowing through each coil of the connected parallel coil pair is also equalized to the same strength. For example, when two coils included in a coil substrate form a parallel coil pair, these coils have different inductance values due to the difference in distance from the core, and the current flowing through one coil is the other coil. Suppose it has become larger. At this time, since the magnetic flux generated from the terminal conductor connected to one coil also increases, an electromotive force is generated in the terminal conductor connected to the other coil in a direction to suppress the increase of the magnetic flux. Then, the current flowing through the other coil increases and the current flowing through the one coil decreases. As a result, the current flowing through each coil of the parallel coil pair is equalized. Therefore, it is possible to form a parallel coil circuit in which an equal current flows in each coil of the parallel coil pair without preparing a core for current equalization separately from the coil device.

It is a figure which shows the coil board | substrate used in an example of embodiment of the electric circuit containing the coil apparatus which concerns on this invention, (a) is the perspective view which looked at the coil board | substrate from the one surface side used as the front side, (b) The perspective view which looked at the coil board | substrate from the other surface side used as a back side. It is a figure which shows the relationship between the coil board | substrate and core in the same embodiment, (a) is a perspective view which shows the state before attaching a core to a coil board | substrate, (b) is a perspective view which shows the state which attached the core to the coil board | substrate. FIG. 4C is a simplified view of the state of FIG. The schematic diagram which shows the mode of wiring of the parallel coil circuit in the embodiment. The figure which represented the circuit of FIG. 3 more simply. It is a figure which shows another example of embodiment of the electric circuit containing the coil apparatus which concerns on this invention, (a) shows the mode of wiring when the 1st coil and the 2nd coil are made into the winding direction of the same direction. The schematic diagram which represented, (b) is the schematic diagram showing the mode of wiring when the two terminal conducting wires which let a core through-hole connect to both end of winding. The perspective view which shows the coil board | substrate and core in a prior art. The schematic diagram which shows the mode of the electric circuit at the time of using an equalization core in a prior art.

Hereinafter, an example of an embodiment of an electric circuit including a coil device according to the present invention will be described with reference to FIGS.
FIG. 1 shows a coil substrate 20 used in the present embodiment. FIG. 1A shows one surface of the coil substrate 20, and this surface may hereinafter be called the front side. FIG. 1B shows the other surface of the coil substrate 20, and this surface may hereinafter be called the back side. The coil substrate 20 has a disk shape made of a material that becomes an insulating layer such as a glass epoxy substrate, and planar coils formed of printed wiring made of a conductive material such as copper are mounted on both surfaces. Yes. That is, the first coil 30 is surface-mounted on the front side shown in FIG. 1 (a), and the second coil 40 is surface-mounted on the back side shown in FIG. 1 (b).

  Further, a coil substrate through hole 25 penetrating in the thickness direction of the substrate is provided at the circular central portion of the coil substrate 20. The first coil 30 and the second coil 40 are each formed to have a spiral shape surrounding the coil substrate through-hole 25, and both have the same shape, but the winding directions are opposite to each other. It has become. The first coil 30 shown in FIG. 1 (a) is right-handed, whereas the second coil 40 also appears to be right-handed in FIG. 1 (b). This is because the coil substrate 20 is viewed from the back side, and the second coil 40 spirals counterclockwise on the front side surface.

  When connecting the first coil 30 and the second coil 40 to a circuit outside the coil substrate 20, in order to allow wiring to both coils from either the front side or the back side, the first coil 30 and The second coil 40 is electrically connected between the front side and the back side at the outer peripheral end and the inner peripheral end. For example, for the outer peripheral end 34 of the first coil 30, the land on the outer peripheral end 34 on the front side shown in FIG. 1A and the land on the outer peripheral end 34 on the rear side shown in FIG. Are electrically connected by vias 24 formed by a plated through hole method or the like, and wiring can be made from the back surface to the outer peripheral side end portion 34 of the first coil 30 on the front side. . Also, the outer peripheral side end 44 of the second coil 40 is such that the front side land and the back side land are electrically connected by the vias 24 so that the wiring can be made to the second coil 40 from the front side. It has become. Similarly, the lands on both the front and back sides are electrically connected to the inner peripheral side end of each coil.

  In the present embodiment, the coil substrate 20 is used with the core 50 made of a magnetic material (ferrite or the like) shown in FIG. FIG. 2A shows a state before the core 50 is attached to the coil substrate 20. The core 50 as a whole has a cylindrical shape having the same diameter as the outer diameter of the coil substrate 20, and a core through hole 55 is formed at the center of the core 50 so as to penetrate the column height direction of the core 50. The core through hole 55 has a circular shape with the same diameter as that of the coil substrate through hole 25 of the coil substrate 20, and when the coil substrate 20 is placed on the core 50, as shown in FIG. 55 and the coil substrate through hole 25 can be communicated with each other. In the present embodiment, a structure in which the core 50 is bonded to the back side of the coil substrate 20 with the core through hole 55 and the coil substrate through hole 25 communicating with each other is used. In a state where the core 50 is attached to the coil substrate 20, the core 50 functions as a common magnetic core for the first coil 30 and the second coil 40.

  When the first coil 30 mounted on the front side of the coil substrate 20 is illustrated as a spiral shape with a solid line, and the second coil 40 mounted on the back side is illustrated with a broken line, as shown in FIG. Here, as shown in FIG. 2C, the first coil 30 and the second coil 40 are shown in a simplified manner. That is, the first coil 30 is a coil element connected between the inner peripheral end 32 and the outer peripheral end 34, and the second coil 40 is the inner peripheral end 42 and the outer peripheral end. It is assumed that it is a coil element connected between the unit 44 and illustrated. The fact that the winding directions of the first coil 30 and the second coil 40 are opposite to each other is represented by using a winding start mark S shown as a black dot beside each coil. When current flows in the same direction with respect to the winding start mark S in the first coil 30 and the second coil 40, the magnetic flux generated by the first coil 30 and the magnetic flux generated by the second coil 40 are In the same direction.

  For example, in FIG. 2C, when a current flows through the first coil 30 from the outer peripheral side end 34 toward the inner peripheral side end 32, the current flows in the right-handed direction in FIG. 2B. Thus, a magnetic flux is generated in the direction from the front side to the back side, that is, downward in the figure. On the other hand, in order to generate a downward magnetic flux from the second coil 40 wound in a counterclockwise manner, a current may be passed from the inner peripheral end 42 toward the outer peripheral end 44. In this way, in FIG. 2C, the end portion (hereinafter referred to as the winding end) from which the winding start mark S is attached to the end portion (hereinafter referred to as the winding start end portion) provided with the winding start mark S. It is determined that a downward magnetic flux is generated in the figure when a current flows toward the edge). When a current is passed from the winding end to the winding start end, an upward magnetic flux is generated in the figure.

  FIG. 3 schematically shows a state where the coil device according to the present invention is incorporated in an electric circuit. The coil device according to the present invention is such that a terminal conductor 70 such as a coated copper wire is further connected to a combination of a coil substrate 20 and a core 50 as shown in FIG. The terminal conducting wire 70 is connected to each end of each coil. In FIG. 3, terminal conductors 70 are connected to the inner peripheral end 32 and the outer peripheral end 34 of the first coil 30 and to the inner peripheral end 42 and the outer peripheral end 44 of the second coil 40, respectively. Has been.

  The first coil 30 and the second coil 40 are connected to the AC power source 62 through these terminal conductors 70. Here, in the present embodiment, a parallel coil circuit is formed by the first coil 30 and the second coil 40. That is, the outer peripheral side end 34 serving as the winding start end of the first coil 30 and the inner peripheral end 42 serving as the winding start end of the second coil 40 are electrically connected, and the first The inner circumferential side end 32 serving as the winding end end of the coil 30 and the outer circumferential side end 44 serving as the winding end end of the second coil 40 are electrically connected, and the winding start end and winding of both coils are wound. Wiring is performed so that the AC power supply 62 applies an AC voltage between the end portion. By performing wiring in this way, the first coil 30 and the second coil 40 operate as coils connected in parallel, that is, parallel coil pairs.

  Of the terminal conductors 70 that form the parallel coil circuit in this way, two terminal conductors 70 connected to separate coils, that is, one connected to the first coil 30 and the second coil 40. Are connected to the coil substrate through hole 25 and the core through hole 55 one by one. In the following, each set of two terminal conductors 70 passed through the core through hole 55 is referred to as a through parallel line. In FIG. 3, the terminal conducting wire 70 connected to the winding end end portion (inner peripheral side end portion 32) of the first coil 30 and the winding start end portion (inner peripheral side end portion 42) of the second coil 40 are connected. The connected terminal conducting wire 70 is passed through the coil substrate through hole 25 and the core through hole 55 to form a through parallel line 35 and a through parallel line 45, respectively.

  If the through parallel line 35 and the through parallel line 45 are wired in this way, an alternating voltage is applied from the alternating current power source 62 to the first coil 30 and the second coil 40, and the first coil 30 and the first coil 30 are connected. When an alternating current flows in the parallel coil circuit formed by the second coil 40, currents in opposite directions flow in the through parallel line 35 and the through parallel line 45 in the core through hole 55. For example, at the moment when the current In flows in the direction of the upward arrow shown on the upper side of the AC power supply 62 in FIG. 3, the current flows in the downward parallel direction in the drawing through the through parallel line 35 connected to the first coil 30. A current flows through the through parallel line 45 connected to the second coil 40 in the upward direction in the figure. Since the current is an alternating current, the direction of the current In is periodically reversed, but the direction of the current flowing through the through parallel line 35 and the through parallel line 45 is also reversed in accordance with the inversion. Therefore, when the direction of the current In is reversed from the direction of the upward arrow in the drawing, an upward current flows through the through parallel line 35 and a downward current flows through the through parallel line 45.

  3 is further simplified and shown in FIG. 4 in order to explain in more detail the flow of currents in opposite directions in the through parallel line 35 and the through parallel line 45. Here, the moment when the current flows in the direction of the arrow of current In shown in FIG. 4 will be considered, and the tail side of the arrow will be described as the upstream side of the circuit, and the tip side of the arrow will be described as the downstream side of the circuit.

  Of the wiring between the AC power supply 62 and the parallel coil pair (the first coil 30 and the second coil 40), when viewed on the upstream side, the winding start end portion (the outer peripheral side of FIG. 3) of the first coil 30 The wiring toward the end portion 34) is led from the upper side (front side) of the core 50, whereas the wiring toward the winding start end portion (inner peripheral side end portion 42 in FIG. 3) of the second coil 40 is performed. The AC power supply 62 and the second coil 40 are connected via a through parallel line 45 that is led from the lower side (back side) of the core 50 and passes through the core through hole 55 from the back side to the front side. Looking at the downstream side, the wiring led from the winding end end portion (inner peripheral side end portion 32 in FIG. 3) of the first coil 30 passes through the through parallel line 35 that passes through the core through hole 55 from the front side to the back side. In contrast to the connection to the AC power supply 62, the wiring led from the winding end (the outer peripheral end 44 in FIG. 3) of the second coil 40 does not pass through the core through hole 55. After joining the wiring on the first coil 30 side, it is connected to the AC power source 62.

  Since wiring is performed as described above, at the moment when the current In from the AC power supply 62 flows in the direction of the arrow in the figure, the through-parallel line 35 of the first coil 30 is wound around the first coil 30. The current flowing out from the end edge flows downward in the figure from the front side to the back side. On the other hand, in the through parallel line 45 of the second coil 40, the current flowing into the winding start end of the second coil 40 flows upward from the back side to the front side. When the direction of the current In is opposite to the arrow direction in the figure, an upward current flows in the through parallel line 35 of the first coil 30 in the figure, and the through parallel of the second coil 40 is obtained. A downward current flows in the line 45 in the drawing.

  In this way, currents in opposite directions flow through the through parallel lines 35 and the through parallel lines 45, so that the through parallel lines 35 and the through parallel lines 45 generate magnetic fluxes in opposite directions in the core through hole 55. Then, the currents flowing through the through parallel lines 35 and the through parallel lines 45 act so as to equalize the strength of each other. Therefore, even if currents having different strengths are likely to flow between the first coil 30 and the second coil 40, the equalization between the through parallel line 35 and the through parallel line 45 results in the result. The same current flows through the first coil 30 and the second coil 40.

  Since the distance between the first coil 30 and the second coil 40 is different from the core 50 by the thickness of the coil substrate 20, the inductance values are also different between the two. For this reason, even if both coils of the same shape are connected in parallel, the current does not flow evenly, but tends to flow with bias. However, this bias is eliminated by the equalizing action between the through parallel line 35 and the through parallel line 45. For example, if the current flows in a biased direction toward the first coil 30, the current flowing through the through parallel line 35 of the first coil 30 becomes stronger than the through parallel line 45 of the second coil 40. Then, the magnetic flux (through the right-handed direction when viewed from the front side) generated by the through parallel line 35 in the core 50 increases. When the magnetic flux generated by the through parallel line 35 increases, an electromotive force is generated in the through parallel line 45 in a direction to prevent the increase. The direction of the electromotive force is opposite to the current of the through parallel line 35, that is, the same direction as the current of the through parallel line 45, so that the current of the through parallel line 45 is strengthened. When the current of the through parallel line 45 increases, the current flowing through the second coil 40 also increases. However, the current flowing through the first coil 30 and the current flowing through the second coil 40 are flows branched from the common current In. Therefore, the current flowing through the first coil is decreased by the amount of increase in the current flowing through the second coil 40. As a result, even if the current flowing through the second coil 40 becomes stronger, the same action occurs in the through parallel line 35 of the first coil 30 and the current flowing through the second coil 40 is weakened. It is done. By repeating such an action, the current finally flowing through the first coil 30 and the current flowing through the second coil 40 are equalized to the same strength.

  As described above, in the present embodiment shown in FIGS. 1 to 4, an equalizing core 96 as shown in FIG. 7 is prepared as a separate body from the coil device including the coil substrate 20, the core 50, and the terminal conductor 70. At least, the current flowing through the first coil 30 and the second coil 40 can be equalized. Therefore, if this coil device is used, for example, the space occupied by the coil device in the non-contact power feeding device can be reduced.

  In the present embodiment, the through parallel lines 35 and the through parallel lines 45 passing through the core through holes 55 are also passed through the coil substrate through holes 25, so that the terminal conductors 70 are connected to the respective coil ends on the front side where wiring is easy. The through parallel lines 35 and the through parallel lines 45 can be guided from the front side to the back side. Further, the through parallel line 35 and the through parallel line 45 are respectively connected to the inner peripheral side end portion 32 of the first coil 30 and the inner peripheral side end portion 42 of the second coil 40 at positions close to the coil substrate through hole 25. Has been. That is, since it is connected to the end located at the peripheral edge of the coil substrate through hole 25, the through parallel line 35 and the through parallel line 45 are connected to the coil substrate 25 and the core through hole 55 from the position connected to each coil end. The path leading to is shortened, and it is not necessary to route the through parallel line 35 and the through parallel line 45 over a long path, which facilitates wiring work and reduces wiring space and material costs.

  Furthermore, while the first coil 30 and the second coil 40 are planar coils that vortex on the coil substrate 20, the through parallel lines 35 and the through parallel lines 45 connect the coil substrate 20 and the core 50. Since it is passed through the coil substrate through hole 25 and the core through hole 55 penetrating in the thickness direction, the magnetic flux generated by the first coil 30 and the second coil 40 and the through parallel line 35 and the through parallel line 45 are generated. Magnetic fluxes are perpendicular to each other and do not affect each other directly. Therefore, even if the core 50 serving as the magnetic core of the first coil 30 and the second coil 40 is used for current equalization, the magnetic flux generated by the first coil 30 and the second coil 40 is disturbed. There is nothing.

  Further, in a system (mechanical device) including a rotating body that can rotate around an axis, when power is supplied to the rotating body by contactless power feeding, the core included in the coil device on the power supply side or the power receiving side May be provided with a rotating shaft hole for passing the rotating shaft of the rotating body, but when forming an electric circuit like this embodiment for such a coil device, a through parallel line Since the rotation shaft hole can be used as the core through hole 55 for passing through, it is not necessary to open the core through hole again, and the electric circuit of this embodiment can be easily formed in the existing system.

  In the above-described embodiment, the coil substrate 20 including the first coil 30 and the second coil 40 whose winding directions are opposite to each other is used. However, the electric circuit according to the present invention uses the core through hole 55. It is sufficient that the set of two conducting wires passed through each is connected to a separate coil and wired so that currents facing each other flow in the core through hole 55. For example, the winding direction is the same direction. A coil substrate including the two coils may be used.

  FIG. 5A shows a schematic circuit diagram when the coil substrate 20 in which the first coil 30 and the second coil 40 are in the same direction is used. In this case, the outer peripheral side end 34 of the first coil 30 is the winding start end as in the case of FIG. 3, whereas the second coil 40 is not the inner peripheral end 42 but the outer peripheral end. The side end portion 44 is a winding start end portion. In this case, the first coil 30 may be wired as in FIG. On the other hand, with respect to the second coil 40, the core lead hole 55 and the coil substrate through hole 25 are formed from the back side to the front side with the terminal lead wire 70 connected to the outer peripheral side end portion 44 serving as the winding start end portion as the through parallel line 45. The terminal conductor 70 connected to the outer peripheral end 44 and connected to the inner peripheral end serving as the winding end is not passed through the core through hole 55 (joins the wiring on the first coil 30 side). Then, it may be connected to the AC power source 62. When wired in this way, the arrangement of the first coil 30 and the second coil 40 as coil elements on the circuit is equivalent to the state shown in FIG. The action of current equalization by the through parallel line 45 is obtained.

  Further, in the embodiment of FIG. 3, with respect to the first coil 30 and the second coil 40 whose winding directions are opposite to each other, a terminal conductor 70 connected to the winding end of the first coil 30, Although the terminal conducting wire 70 connected to the winding start end of the second coil 40 is a through parallel line 35 and a through parallel line 45, respectively, the combination of the terminal conducting wires as the through parallel lines is not limited to this. If wiring is performed as shown in FIG. 3, the inner peripheral side end 35 close to the coil substrate through-hole 25 and the terminal conductor 70 connected to the inner peripheral end 45 are passed through the coil substrate through-hole 25. Thus, although it is not necessary to route the wiring largely, the wiring method may be changed if there is a situation where such wiring cannot be performed due to the convenience of connection with devices other than the coil device. For example, a set of two through parallel wires may be used as the terminal conductor 70 connected to the end of winding of both coils.

  In FIG. 5B, the winding end end portion (inner peripheral side end portion 32) of the first coil 30 using the coil substrate 20 including the first coil 30 and the second coil 40 whose winding directions are opposite to each other. ) And a circuit schematic diagram in the case where the terminal conducting wires 70 respectively connected to the winding end ends (outer peripheral end 44) of the second coil 40 are the through parallel lines 35 and the through parallel lines 45. In this case, the terminal conductors 70 connected to the winding start ends (the outer peripheral end 34 and the inner peripheral end 42) of both coils are not passed through the coil substrate through-hole 25 and the core through-hole 55. They are joined and connected to the AC power source 62. And the terminal conducting wire 70 connected to the inner peripheral side end part 32 which is the winding end part of the first coil 30 is passed through the coil substrate through hole 25 and the core through hole 55 from the front side to the back side and penetrates. A parallel line 35 is formed. On the other hand, when the terminal conducting wire 70 connected to the outer peripheral end 44 that is the winding end of the second coil 40 passes through the coil substrate through hole 25 and the core through hole 55 from the front side to the back side. The current flows in the same direction as the through parallel line 35 in the core through hole 55. Therefore, by passing through the core through-hole 55 and the coil substrate through-hole 25 from the back side to the front side while bypassing the core 50, the through-parallel line 45 in which a current opposite to the through-parallel line 35 flows can be obtained.

  Thus, the electric circuit according to the present invention is not the same wiring as that of FIG. 3, but a pair of through parallel wires that are passed through the core through hole when an alternating current flows in the parallel coil circuit. Since it is only necessary for currents in opposite directions to flow in each of these, the way of wiring can be variously changed according to the actual use situation.

  In addition, since the wiring method can be changed in various ways, the coil device according to the present invention is connected to the coil substrate 20 including a plurality of coils, the core 50 having the core through-hole 55, and separate coils to the core through-hole 55. What is necessary is just to have a set of two terminal conductors 70 (through parallel lines) passed therethrough. For example, if a coil device in which a plurality of coils included in the coil substrate 20 are not yet connected in parallel is prepared, when the coil device is actually incorporated into an electric circuit, not only as a parallel coil circuit but also a plurality of coils are included. These coils can also be used as a series coil circuit formed by connecting the coils in series. When used as a parallel coil circuit, wiring may be performed according to actual usage conditions so that currents in opposite directions flow through the through parallel lines.

  In the above-described embodiment, the coil substrate through hole 25 communicates with the core through hole 55 so that the through parallel line 35 and the through parallel line 45 are passed through them. A flat plate without holes may be used. In that case, a core through-hole is formed from the back coil end connected to the front coil end by the via 24 using a thin film-like wiring that can be routed between the back side of the coil substrate 20 and the top surface of the core 55. What is necessary is just to lead a lead to 55.

  In the above-described embodiment, a planar coil substrate composed of two layers, the front side and the back side, is used as the coil substrate 20. However, other types of coil substrates may be used. For example, the coil pattern layers are stacked in layers in the substrate. A laminated coil substrate that is formed so as to be raised may be used. The number of coils included in the coil substrate is not limited to two, and there may be a plurality of pairs of coil pairs. For example, a coil substrate having two coil pairs, that is, four coils, may be used. For each coil pair, a plurality of sets of two through parallel lines (two sets in this case) passed through the core through hole are used. If the two coil pairs are used as separate parallel coil circuits, the current can be equalized in either parallel coil circuit. When two or more coil pairs are present, separate core through holes may be provided for each set of through parallel lines corresponding to each coil pair, but two through parallels belonging to the same set may be provided. The lines are preferably passed through the same core through hole.

  In the above-described embodiment, the cylindrical core 50 is used. However, the shape of the core is not limited to this, and any shape may be used as long as a core through hole through which a through parallel line can pass is formed. . For example, a pot-shaped core with a core through hole formed as described at the beginning may be used. In this case, if the core through hole is provided in the axial center, the core through hole is rotated by the rotating body. It can also be used as a rotating shaft hole through which the shaft passes. In order to ensure equalization of the current, it is desirable to make the core through hole as small as possible so that the through parallel lines can interact with each other reliably. The rotary shaft hole and the core through hole may be separate holes.

20 Coil substrate 25 Coil substrate through hole 30 First coil 35 Through parallel line 40 Second coil 45 Through parallel line 50 Core 55 Core through hole 62 AC power supply 70 Terminal conductor

Claims (6)

An electrical circuit including a coil device,
The coil system, possess the coil substrate including at least two coils, a core serving as a common magnetic core of the coil is attached to the coil board, and a terminal lead connected to each end of the coil,
The core is provided with a core through-hole penetrating the core itself,
Among the terminal conductors, at least two terminal conductors respectively connected to separate coils are passed through the core through hole ,
A coil pair consisting of at least a pair of two coils is a parallel coil pair that is connected in parallel to form a parallel coil circuit,
The plurality of terminal conducting wires passed through the core through hole includes at least one set of penetrating parallel wires in which two terminal conducting wires connected to each of the coils forming the parallel coil pair are combined. ,
Each of the terminal conductors of the through parallel line is configured such that, when an alternating current flows in a parallel coil circuit formed by a parallel coil pair to which the terminal parallel wires are connected, currents in opposite directions flow in the core through hole. An electric circuit characterized by being wired . The coil substrate is provided with a coil substrate through hole penetrating the substrate thickness direction,
The electric circuit according to claim 1, wherein the terminal conducting wire passed through the core through hole is also passed through the coil substrate through hole. Each coil included in the coil substrate has a spiral shape surrounding the coil substrate through hole,
The end of the coil to which the terminal conducting wire passed through the coil substrate through-hole and the core through-hole is connected is located at the peripheral edge of the coil substrate through-hole. Electrical circuit . The coil substrate includes at least a pair of coil pairs formed of two planar coils whose winding directions are opposite to each other, and the two planar coils constituting the coil pair overlap each other in the substrate thickness direction of the coil substrate. The electrical circuit according to claim 1, wherein the electrical circuits are separated from each other by an insulating layer. The first coil and the second coil form a parallel coil pair, and the winding start end of the first coil and the winding start end of the second coil are electrically connected; and A parallel coil circuit is formed by electrically connecting the winding end end of the first coil and the winding end end of the second coil,
The set of the terminal conducting wire connected to the winding end end of the first coil and the terminal conducting wire connected to the winding start end of the second coil is a through parallel line. The electric circuit according to any one of claims 1 to 4 . The coil device is used as a coil device on the power feeding side or the power receiving side used for non-contact power feeding of a mechanical device including a rotating body, and a rotating shaft hole for passing the rotating shaft of the rotating body through the core of the coil device The electric circuit according to any one of claims 1 to 5 , wherein the rotation shaft hole is used as a through hole for passing a through parallel line.

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