JP5098888B2 - Inductance device - Google Patents

Description

  The present invention relates to an inductance device, and more particularly to an inductance device in which inductance components such as a transformer and a coil are integrated.

  A power supply device such as a high frequency insulated DC-DC converter uses an inductance component such as a transformer or a coil. Conventionally, in order to reduce the size of a power supply device, an inductance device in which a transformer and a coil are provided on a common core and integrated has been proposed. For example, it is patent document 1. FIG.

JP 2007-311397 A

  In the inductance device disclosed in Patent Literature 1, the core 100 includes three columnar portions 101 to 103 as shown in FIG. Windings 201 to 203 are wound around the respective columnar portions 101 to 103. Since the winding 201 and the winding 202 connected in series are wound in opposite directions, the magnetic flux loop generated by the windings 201 and 202 and the magnetic flux loop generated by the winding 203 interfere with each other. Not to be.

  When configuring the transformer of the power supply device, similarly to the windings 201 and 202, a winding obtained by winding two windings connected in series in opposite directions is a primary winding, and the winding 201, A terminal T1 provided at a connection point 202 and one terminal T2 of the winding 203 are connected. As a result, the windings 201 and 202 can be secondary windings of the transformer, and the winding 203 can be a smoothing coil connected to the intermediate tap of the secondary winding.

  However, in the conventional inductance device shown in FIG. 12, the structure of the winding is complicated, such as the need to connect the terminal T1 and the terminal T2. Therefore, it is difficult to process the winding, which is a problem for mass production.

  Further, in order to avoid the saturation of the magnetic flux density due to the direction of the magnetic flux loop generated by the winding 203 being always the same direction, a gap G1 is provided in the columnar portion 103 of the core 100 as shown in FIG. However, there is a possibility that the stability of the core may be deteriorated by the gap G1, which is a problem.

  The present invention has been proposed in view of the above problems. An object of the present invention is to provide an inductance device that simplifies the structure, is easy to process, and ensures the stability of the core in the integration of inductance components such as a transformer and a coil.

  The inductance device according to claim 1 includes a first core portion, a second core portion disposed substantially parallel to the first core portion, and a center of both core portions connecting the first core portion and the second core portion. Two inner magnetic legs arranged at predetermined intervals on the part, and an outer magnetic leg arranged on the outer side with respect to the two inner magnetic legs connecting the first core part and the second core part. Including a core, a first coil part wound around one of the two inner magnetic legs, a second coil part connected in series to the first coil part and wound around the other of the two inner magnetic legs, A third coil part connected in series to the second coil part, wound around the other of the two inner magnetic legs, and connected in series to the third coil part, wound around one of the two inner magnetic legs The coil set including the fourth coil portion and the two inner magnetic legs are wound around the inner magnetic legs so that magnetic fluxes having the same direction and the same magnitude are generated. And a fifth coil unit that is. The first to fourth coil portions include a magnetic flux generated in one of the two inner magnetic legs by a current flowing through the first coil portion and a current flowing through the fourth coil portion, and a current flowing through the second coil portion and the third coil portion. The magnetic flux generated in the other of the two inner magnetic legs by the current flowing through is wound around the inner magnetic legs in directions opposite to each other.

  Thus, in the inductance device according to the first aspect, magnetic fluxes in opposite directions are generated in the two inner magnetic legs by the current flowing through the coil set including the first to fourth coil portions. Therefore, one of the two inner magnetic legs—the first core part—the other of the two inner magnetic legs—the second core part—one of the two inner magnetic legs, and a magnetic flux loop are formed. Further, the fifth coil portion is wound around the inner magnetic legs so that magnetic fluxes having the same direction and the same magnitude are generated in the two inner magnetic legs. Therefore, both the two inner magnetic legs—the first core part—the outer magnetic leg—the second core part—the two inner magnetic legs, and a magnetic flux loop that circulates are formed. These flux loops act to add together at either of the two inner magnetic legs and cancel out at either. Therefore, since the influence which mutually has is canceled as a whole, a coil set and a 5th coil part can be provided and integrated in a common core without a problem.

  An inductance device according to a second aspect includes an intermediate tap at a connection point between the second coil portion and the third coil portion in addition to the configuration of the inductance device according to the first aspect. The fifth coil part is connected to the intermediate tap.

  Thereby, a coil set and a 5th coil part can be directly connected by the shortest path | route using an intermediate | middle tap. Therefore, the wiring space can be minimized, and heat loss in the conductive line can be reduced.

  In addition to the configuration of the inductance device according to claim 1 or 2, the inductance device according to claim 3 is configured such that the first to fourth coil portions are plate-shaped, a portion extending from the first coil portion to the second coil portion, The portion from the third coil portion to the fourth coil portion has the same shape.

  Thereby, for example, a coil set can be formed using a rectangular wire having a rectangular cross section. Since the part from the first coil part to the second coil part and the part from the third coil part to the fourth coil part have the same shape, the same parts can be used for both parts. Parts can be shared and the structure can be simplified.

  In addition to the configuration of the inductance device of claim 3, the inductance device according to claim 4 includes a portion from the first coil portion to the second coil portion, and a portion from the third coil portion to the fourth coil portion. It is substantially S-shaped.

  As a result, in addition to being able to use the same parts for both parts, a substantially S-shaped part is overlapped in the opposite direction to form an 8-shape, and a coil set wound around two inner magnetic legs Can be configured. Therefore, processing becomes easy.

  In addition to the configuration of the inductance device according to any one of the first to fourth aspects, the outer magnetic leg includes a gap.

  Thereby, even if the magnetic flux generated by the current flowing through the fifth coil portion forms a magnetic flux loop that always passes through the outer magnetic leg in the same direction, saturation of the magnetic flux density can be prevented. Since the first core portion and the second core portion are supported by the two inner magnetic legs, the stability of the core is not deteriorated by the gap between the outer magnetic legs.

  An inductance device according to a sixth aspect of the present invention is the inductance device according to any one of the first to fifth aspects, comprising two sets of coil sets to form a transformer.

  As described above, in the inductance device of the present invention, the coil set and the fifth coil portion can be provided and integrated on a common core without any problem. Therefore, it is possible to obtain a transformer in which two sets of coils are provided to form a primary side winding and a secondary side winding of a transformer and an output coil as a fifth coil unit is integrated.

  According to the inductance device of the present invention, the structure is simplified in the integration of inductance components such as a transformer and a coil, the processing becomes easy, and the stability of the core is ensured. If the inductance device of the present invention is used, the power supply device can be reduced in size.

A first embodiment in which the inductance device of the present invention is embodied will be described with reference to FIGS.
As shown in FIG. 1, the inductance device according to the first embodiment includes a core 10, coil sets 20, 40, and an output coil 30 as a fifth coil unit. Of the two sets of coils 20 and 40, the output coil 30 is integrated with the coil set 40 as the primary winding of the transformer and the coil set 20 to which the output coil 30 is connected as the secondary winding of the transformer. The formed transformer is formed. Details will be described below.

  First, the core 10 will be described. FIG. 2 is a perspective view showing the core 10 provided in the inductance device according to the first embodiment. FIG. 3 is a cross-sectional view of the core 10 shown in FIG. FIG. 3 is a cross-sectional view of the first core portion 11 removed from the perspective view of FIG.

  As shown in FIG. 2, the core 10 includes a first core part 11, a second core part 12, two inner magnetic legs 13 and 14, and an outer magnetic leg 15. The rectangular plate-like first and second core portions 11 and 12 face each other and are arranged substantially in parallel. The first core portion 11 and the second core portion 12 are connected by two inner magnetic legs 13 and 14 and an outer magnetic leg 15. As shown in FIG. 3, the two inner magnetic legs 13, 14 are arranged at a predetermined distance from each other in the central part of the first and second core parts 11, 12. The outer magnetic leg 15 is disposed outside the two inner magnetic legs 13 and 14. In the present embodiment, the outer magnetic legs 15 are parallel to the arrangement direction of the inner magnetic legs 13 and 14 in FIG. 3 and are disposed at both ends in the vertical direction of the first and second core parts 11 and 12, thereby The legs 13 and 14 are symmetrical.

  Next, the coil set 20 will be described. FIG. 4 shows a state where the coil set 20 included in the inductance device according to the first embodiment is combined with the core 10 shown in FIG.

  As shown in FIG. 4, the coil set 20 includes a first coil part 21, a second coil part 22, a third coil part 23, and a fourth coil part 24. The first coil portion 21 is wound around the inner magnetic leg 13. The second coil portion 22 is connected in series to the first coil portion 21 and is wound around the inner magnetic leg 14. The third coil part 23 is connected in series to the second coil part 22 and is wound around the inner magnetic leg 14. The fourth coil unit 24 is connected in series to the third coil unit 23 and is wound around the inner magnetic leg 13. The 1st thru | or 4th coil parts 21-24 form the figure 8 shape on the whole, and when it sees in the path | route from the 1st coil part 21 to the 4th coil part 24, the 1st coil part 21 turns clockwise. The second coil portion 22 is wound counterclockwise, the third coil portion 23 is wound counterclockwise, and the fourth coil portion 24 is wound clockwise. In addition, an intermediate tap T is provided at a connection point between the second coil portion 22 and the third coil portion 23 for lead wiring.

  Next, the output coil 30 will be described. FIG. 5 shows a state where the output coil 30 provided in the inductance device according to the first embodiment is further combined with the core 10 and the coil set 20 shown in FIG.

  As shown in FIG. 5, the output coil 30 is connected to the intermediate tap T of the coil set 20 and is wound around both of the two inner magnetic legs 13 and 14.

Here, the operation of the coil set 20 and the output coil 30 combined with the core 10 will be described.
As described above, the first coil part 21 and the fourth coil part 24 wound around the inner magnetic leg 13 and the second coil part 22 and the third coil part 23 wound around the inner magnetic leg 14 are: They are wound in opposite directions. Therefore, magnetic fluxes in opposite directions are generated in the two inner magnetic legs 13 and 14 by the current flowing through the coil set 20 including the first to fourth coil portions 21 to 24, respectively. Offset. Therefore, a magnetic flux loop is formed from the inner magnetic leg 13 to the inner magnetic leg 14 through the first core part 11 and back to the inner magnetic leg 13 through the second core part 12.

  As described above, the output coil 30 is wound around both of the two inner magnetic legs 13 and 14. Therefore, magnetic fluxes having the same magnitude are generated in the same direction on the two inner magnetic legs 13 and 14, reach the outer magnetic leg 15 from the two inner magnetic legs 13 and 14 through the first core portion 11, and A magnetic flux loop is formed that returns to the two inner magnetic legs 13 and 14 through the two-core portion 12.

  These magnetic flux loops act so that either one of the two inner magnetic legs 13, 14 can be added or canceled. Therefore, since the influence which mutually has is canceled as a whole, the coil set 20 and the output coil 30 can be provided in the common core 10 and integrated without a problem.

  Again, the configuration of the entire apparatus will be described with reference to FIG. The inductance device according to the first embodiment includes a similar coil set 40 in addition to the coil set 20. As shown in FIG. 1, the coil sets 20 and 40 both form a figure 8 shape by connecting two substantially S-shaped parts that are stacked in a reverse direction and connected to each other. It is wound around the magnetic legs 13 and 14. Further, as described above, the output coil 30 is connected to the intermediate tap T of the coil set 20. The inductor 10 is configured by integrally assembling the core 10 using a tape or the like.

  The operation and effect of the inductance device according to the first embodiment configured as described above will be described. As described above, in the inductance device according to the first embodiment, the influence of the magnetic flux loop generated by the coil set 20 and the magnetic flux loop generated by the output coil 30 is offset as a whole. Similarly, the influence of the magnetic flux loop generated by the coil set 40 and the magnetic flux loop generated by the output coil 30 is canceled out as a whole. That is, the coil sets 20 and 40 and the output coil 30 can be provided on the common core 10 and integrated without any problem. Accordingly, two sets of coil sets 20 and 40 are provided, and as shown in FIG. 6, the coil set 40 is used as the primary winding of the transformer, and the coil set 20 in which the output coil 30 is connected to the intermediate tap T is used as the transformer. Secondary winding. As the coil set 40 is periodically reversed and energized, the first and second coil parts 21 and 22 and the third and fourth coil parts 23 and 24 of the coil set 20 are alternately and secondaryly provided. A side current can be induced to flow through the output coil 30 via the intermediate tap T and be smoothed. Thus, a transformer in which the smoothing output coil 30 is integrated can be obtained.

  Moreover, since the coil set 20 and the output coil 30 can be directly connected by the shortest path using the intermediate tap T, the wiring space can be minimized and the heat loss in the conductive line can be reduced. can do. In addition, both the coil sets 20 and 40 are formed in an 8-shaped shape by connecting two substantially S-shaped parts that are stacked in the opposite direction and connected. Therefore, the parts can be shared, the structure can be simplified, and the processing becomes easy.

  A second embodiment in which the inductance device of the present invention is embodied will be described with reference to FIG. FIG. 7 is a schematic diagram showing the direction in which the coil set 20 is wound in an easy-to-understand manner. In said 1st Embodiment, the coil sets 20 and 40 are plate shape, for example, are formed using the flat wire which is a conducting wire whose cross-sectional shape is a rectangle. In the second embodiment, the coil sets 20 and 40 are formed using a round wire having a circular cross-sectional shape. Since other configurations are the same as those in the first embodiment, differences from the first embodiment will be mainly described, and description thereof will be omitted.

  As shown in FIG. 7, the coil set 20 of the second embodiment, when viewed in the path from the upper left terminal of the drawing to the lower left terminal of the drawing, turns clockwise to the inner magnetic leg 13 and then counterclockwise to the inner magnetic leg 14. It is wound around and the intermediate tap T is pulled out. The coil set 20 is further wound around the inner magnetic leg 14 counterclockwise and then around the inner magnetic leg 13 clockwise. Each is wound the same number of times, and in this embodiment, it is wound once. The coil set 40 is also similar to the coil set 20 although illustration is omitted.

  Thereby, also in 2nd Embodiment, the transformer with which the output coil 30 was integrated can be obtained similarly to 1st Embodiment. In addition, each of the coil sets 20 and 40 is composed of one round wire having a circular cross-sectional shape, and the same parts can be used.

  A modification of the core 10 applied to the inductance device according to the first and second embodiments will be described with reference to FIG. In the core 10 shown in FIG. 8, the outer magnetic leg 15 includes a gap G. Thereby, even if the magnetic flux generated by the current flowing through the output coil 30 always forms a magnetic flux loop passing through the outer magnetic leg 15 in the same direction, saturation of the magnetic flux density can be prevented. Since the first core portion 11 and the second core portion 12 are supported by the two inner magnetic legs 13 and 14, the stability of the core 10 is not deteriorated by the gap G of the outer magnetic legs 15. Stability is ensured.

  As described above in detail, according to each of the embodiments of the present invention, the plate-like first and second core portions 11 and 12 are supported at the central portion by the two inner magnetic legs 13 and 14, The core 10 is formed by surrounding the outer magnetic leg 15 on the side. Since the shape of the core 10 is symmetrical, the stability is excellent.

  In both the first and second embodiments, the complicated winding structure which has been a problem of the background art has been improved, and in particular, the structure of the secondary winding of the transformer has been simplified. The first embodiment in which the coil sets 20 and 40 are composed of two plate-like and substantially S-shaped parts is more suitable for mass production because of easy processing.

  Further, in the inductance device of the present invention, the winding portions of the coil sets 20 and 40 and the output coil 30 are surrounded by the core 10, so that they become an obstacle when the core 10 is assembled integrally using a tape or the like. There is nothing. Therefore, there is an advantage that the assembly of the core 10 becomes easy.

  Note that the present invention is not limited to the above-described embodiments, and various modifications and changes can be made without departing from the spirit of the present invention.

  As shown in FIG. 3, the outer magnetic legs 15 are disposed at both ends of the first and second core portions 11 and 12, but are not limited thereto. For example, a U-shaped arrangement as shown in FIGS. 9 and 10 may be used. The outer magnetic leg 15 only needs to be arranged so as to surround the outside of the two inner magnetic legs 13, 14. Even if the outer magnetic legs 15 shown in FIGS. 9 and 10 are used, the same as in each of the above embodiments. The effect is obtained.

In addition to the intermediate tap T of the coil set 20, the output coil 30 is connected to the end of the coil set 20 on the first coil portion 21 side or the fourth coil portion 24 side, and is connected as shown in FIG. It may be said.
Each coil set uses a plate-like rectangular wire (rectangular cross section) as a winding in the first embodiment and a round wire in the second embodiment, but the coil sets 20, 40 and output coil 30 have different windings. May be used. For example, a round wire may be used for the coil set 40 and the output coil 30, and a flat wire may be used for the coil set 20.
In the above-described embodiment, the output coil 30 is wound so as to surround both of the two inner magnetic legs 13 and 14, but magnetic fluxes having the same direction and the same magnitude are generated on the inner magnetic legs 13 and 14. As shown, the inner magnetic legs 13 and 14 may be wound respectively.
In the above-described embodiment, the inductance device in which the transformer and the output coil of the power supply device are integrated has been described. For example, from one of the coil set 20 and the coil set 40 and the fifth coil portion. It may be used as an inductance device in which two inductance components are integrated.

The block diagram which shows the inductance apparatus which concerns on 1st Embodiment. The perspective view which shows the core 10. FIG. FIG. Sectional drawing which shows the core 10 and the coil set 20. FIG. Sectional drawing which shows the core 10, the coil set 20, and the output coil 30. FIG. The connection diagram of the inductance apparatus which concerns on 1st Embodiment. Sectional drawing which shows the core 10 and coil set 20 of 2nd Embodiment. The perspective view which shows the modification of the core 10. FIG. Sectional drawing which shows the modification 1 of the outer side magnetic leg 15. FIG. Sectional drawing which shows the modification 2 of the outer side magnetic leg 15. FIG. The connection diagram which shows the other example of a connection of an inductance apparatus. The perspective view which shows the conventional inductance apparatus. The perspective view which shows the core of the conventional inductance apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Core 11 1st core part 12 2nd core part 13, 14 Inner magnetic leg 15 Outer magnetic leg 20, 40 Coil set 21 1st coil part 22 2nd coil part 23 3rd coil part 24 4th coil part 30 Output coil T Intermediate tap G Gap

Claims (6)

A first core part;
A second core portion disposed substantially parallel to the first core portion;
Two inner magnetic legs that connect the first core part and the second core part and are arranged at a predetermined interval from each other at the center part of both core parts;
A core including an outer magnetic leg arranged outward with respect to the two inner magnetic legs, connecting the first core part and the second core part;
A first coil portion wound around one of the two inner magnetic legs; a second coil portion connected in series to the first coil portion and wound around the other of the two inner magnetic legs; A third coil part connected in series to the second coil part and wound around the other of the two inner magnetic legs, and connected in series to the third coil part and wound around one of the two inner magnetic legs. A coil set including a rotated fourth coil part;
A fifth coil portion wound around the inner magnetic legs so that magnetic fluxes having the same direction and the same magnitude are generated in the two inner magnetic legs,
The first to fourth coil portions are
A magnetic flux generated in one of the two inner magnetic legs by a current flowing through the first coil portion and a current flowing through the fourth coil portion, and a current flowing through the second coil portion and a current flowing through the third coil portion. An inductance device in which a magnetic flux generated on the other of the two inner magnetic legs is wound around the inner magnetic legs in directions opposite to each other. An intermediate tap is provided at a connection point between the second coil portion and the third coil portion,
The inductance device according to claim 1, wherein the fifth coil unit is connected to the intermediate tap.   The first to fourth coil portions are plate-like, and a portion from the first coil portion to the second coil portion and a portion from the third coil portion to the fourth coil portion have the same shape. The inductance device according to claim 1 or 2.   The inductance device according to claim 3, wherein a portion from the first coil portion to the second coil portion and a portion from the third coil portion to the fourth coil portion are substantially S-shaped.   The inductance device according to claim 1, wherein the outer magnetic leg includes a gap.   The inductance device according to claim 1, wherein two sets of the coil sets are provided to form a transformer.

Images