JP2016066744A - Compound type reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compound type reactor that can reduce magnetic flux leakage occurring around it.SOLUTION: The magnetic core of a compound type reactor comprises a first core part around which a first coil is wound and a second core part around which a second coil is wound. The first and second coils, which are arrayed with the magnetic core as the common core, have a first wound part and a second wound part together with a third wound part and a fourth wound part, each pair being split-wound around a different central axis of the coils. The first wound part and the second wound part on one hand and the third wound part and the fourth wound part on the other are arrayed in such directions that magnetic fluxes interlinking around the first and second coils cancel each other. In the first wound part and the second wound part respectively split-wound around the first and second coils and in the second core part caused to oppose the first core part by the third wound part and the fourth wound part, the directions of magnetic fluxes are reverse to each other.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a composite reactor having a small leakage magnetic flux generated around the present invention.

  Patent Document 1 discloses a composite reactor for a booster device and a booster device. The booster composite reactor includes a core (first magnetic leg and second magnetic leg, central magnetic leg, first magnetic joint part and second magnetic joint part), first winding and second winding. It consists of. The first winding is wound around the first magnetic connection portion of the core, and the second winding is wound around the second magnetic connection portion of the core. In addition, a gap is provided in the first magnetic connection portion and the second magnetic connection portion.

  When the composite reactor is driven using a booster, a magnetic flux proportional to the input current is generated around the first winding and the second winding. The magnetic flux generated around the first winding tends to flow not only to the first magnetic path formed in the first magnetic leg but also to the first leakage magnetic path passing through the second magnetic leg. However, while four gaps are arranged in the first magnetic path, eight gaps are arranged in the first leakage magnetic path, and the magnetic resistance is much larger than the first magnetic path, The magnetic flux in the first leakage magnetic path is significantly less than the magnetic flux in the first magnetic path. Also in the magnetic flux generated by the second winding, the magnetic flux of the second leakage magnetic path is reduced by the air gap with respect to the second magnetic path. As a result, the magnetic mutual influence between the first winding and the second winding can be suppressed, and each can operate as an independent reactor.

JP 2005-80442 A

  The composite reactor of Patent Document 1 is configured to be able to operate as an independent reactor while suppressing the magnetic mutual influence between the first winding and the second winding, but is generated around the reactor. No measures have been taken to suppress leakage magnetic flux. For this reason, when the composite reactor of Patent Document 1 is driven using a booster device, leakage magnetic flux generated around the composite reactor is an element that is susceptible to magnetic flux among the components of the booster device (for example, Undesirably affecting current sensors, pulse transformer type insulation elements, etc.).

  An object of the present invention is to provide a composite reactor capable of reducing leakage magnetic flux generated in the surroundings.

In order to achieve the above object, the invention described in claim 1
A magnetic core (for example, magnetic cores 11, 21, 31, 41, 51 in embodiments described later) and a first coil (for example, an embodiment described later) disposed on the magnetic core using the magnetic core as a common core Coil 12) and a second coil (for example, a coil 13 in an embodiment described later), and a composite reactor (for example, a composite reactor 10, 20 in an embodiment described later),
The magnetic core includes a first core portion (for example, a first core portion 11a, 21a, 31a, 41a, 51a in an embodiment described later) around which the winding of the first coil is wound, and the second coil. A second core part (for example, a second core part 11b, 21b, 31b, 41b, 51b in an embodiment described later) around which the winding is wound,
The first coil includes a first winding part (for example, a first winding part 12a in an embodiment described later) and a second winding part (for example, an implementation described later) that are separately wound on different winding center axes. A second winding part 12b) in the form,
The first winding part and the second winding part are respectively arranged in directions in which magnetic fluxes interlinking around the first coil cancel each other,
The second coil includes a third winding part (for example, a third winding part 13a in an embodiment described later) and a fourth winding part (for example, an implementation described later) that are separately wound on different winding center axes. A fourth winding part 13b) in the form,
The third winding portion and the fourth winding portion are respectively arranged in directions in which magnetic fluxes interlinking around the second coil cancel each other,
The direction of the magnetic flux in the first core portion by the first winding portion is substantially opposite to the direction of the magnetic flux in the second core portion by the third winding portion,
The direction of the magnetic flux in the first core portion by the second winding portion is substantially opposite to the direction of the magnetic flux in the second core portion by the fourth winding portion.

The invention according to claim 2 is the invention according to claim 1,
The winding center axis of the first winding part (for example, winding center axes Z11 and Z41 in the embodiment described later) and the winding center axis of the third winding part (for example, winding in the embodiment described later) Line center axes Z13 and Z43) and the winding center axis of the second winding part (for example, winding center axes Z12 and Z42 in the embodiments described later) and the fourth winding part. The winding center axis (for example, winding center axes Z14 and Z44 in the embodiments described later) is common.

The invention according to claim 3 is the invention according to claim 1,
An end surface of the first core portion facing the second core portion and an end surface of the second core portion facing the first core portion at least partially overlap.

The invention according to claim 4 is the invention according to any one of claims 1 to 3,
The winding center axis (for example, winding center axes Z11, Z41, Z51 in the embodiments described later) and the winding center axis (for example, in embodiments described later) of the first winding section. Winding center axes Z12, Z42, Z52) are parallel to each other, and the winding center axes of the third winding portion (for example, winding center axes Z13, Z43, Z53 in the embodiments described later) and the above Winding central axes (for example, winding central axes Z14, Z44, Z54 in the embodiments described later) of the fourth winding part are parallel to each other.

The invention according to claim 5 is the invention according to any one of claims 1 to 4,
Winding center axes of the first winding part, the second winding part, the third winding part, and the fourth winding part (for example, winding center axes Z11 to Z14, Z21 in the embodiments described later) ~ Z24) are included on the same plane.

The invention according to claim 6 is the invention according to any one of claims 1 to 4,
A first plane including each winding center axis (for example, winding center axes Z41 and Z43 in the embodiments described later) of the first winding part and the third winding part, the second winding part and the This is a plane different from the second plane including each winding center axis (for example, winding center axes Z42 and Z44 in the embodiments described later) of the fourth winding section.

The invention according to claim 7 is the invention according to any one of claims 1 to 4,
A first plane including each winding center axis (for example, winding center axes Z51 and Z52 in the embodiments described later) of the first winding portion and the second winding portion; the third winding portion; This is a plane different from the second plane including each winding center axis (for example, winding center axes Z53 and Z54 in the embodiments described later) of the fourth winding section.

The invention according to claim 8 is the invention according to any one of claims 1 to 7,
The magnetic path length of the magnetic flux generated by the first coil in the magnetic core is equal to the magnetic path length of the magnetic flux generated by the second coil in the magnetic core.

The invention according to claim 9 is the invention according to claim 8,
The magnetic path of the magnetic flux generated by the first coil in the magnetic core and the magnetic path of the magnetic flux generated by the second coil in the magnetic core have a common shape of an annular or rectangular loop shape.

The invention according to claim 10 is the invention according to any one of claims 1 to 9,
The first core portion and the second core portion are formed in the same shape, and the magnetic core is configured by combining the first core portion and the second core portion.

  According to the first aspect of the present invention, the magnetic flux generated around the first and second windings that are separately wound of the first coil cancel each other, so that the leakage magnetic flux around the first coil is reduced. Can be reduced. Similarly, the leakage magnetic flux around the second coil can be reduced by canceling out the magnetic fluxes generated around the third winding portion and the fourth winding portion that are separately wound around the second coil. Furthermore, since the direction of the magnetic flux in the first core portion by the first coil and the direction of the magnetic flux in the second core portion by the second coil are in conflict, magnetic saturation of the magnetic core is less likely to occur, and the composite reactor according to the present invention is achieved. Sufficiently functions as a magnetically coupled reactor.

  According to the invention of claim 2, the effect of canceling out magnetic flux generated around each coil can be further enhanced, and the leakage magnetic flux can be further reduced.

  According to invention of Claim 3, it fully functions as a magnetic coupling type reactor.

  According to invention of Claim 4, the cancellation effect of the magnetic flux which generate | occur | produces around each coil can further be heightened, and a leakage magnetic flux can be reduced more.

  According to the invention of claim 5, since each winding central axis is included on the same plane, the number of turns of each winding part of each coil, the size of the magnetic core, and the like can be easily designed.

  According to the sixth aspect of the present invention, even if the winding central axes are not on the same plane, at least part of the mutual magnetic flux cancels each other, so that the leakage magnetic flux can be reduced.

  According to the seventh aspect of the present invention, even if the winding central axes are not on the same plane, at least a part of the mutual magnetic flux cancels out, so that the leakage magnetic flux can be reduced.

  According to invention of Claim 8, since the magnetic flux formed in each core part is equal, a leakage magnetic flux can be reduced.

  According to invention of Claim 9, since the shape of the magnetic path formed in each core part is common, the magnetic flux which generate | occur | produces around each coil balances, and a leakage magnetic flux can be reduced efficiently.

  According to the invention of claim 10, the composite reactor according to the present invention can be easily manufactured by combining the two core portions after winding the coil winding around the unintegrated core portions. Can do.

1 is a circuit diagram showing an example of a two-phase interleaved DC / DC converter to which a composite reactor according to the present invention can be applied. 2 is a graph showing an example of a current change according to switching control of each switch unit in the DC / DC converter shown in FIG. 1. It is a figure which shows typically the composite type reactor of 1st Embodiment. It is a disassembled perspective view explaining the division | segmentation winding structure of the coil | winding part of each coil of the composite reactor of 1st Embodiment. In the composite reactor of 1st Embodiment, it is a figure which shows a part of magnetic flux which generate | occur | produces around the reactor comprised from one coil and the 1st core part. It is a figure which shows an example of distribution of the leakage magnetic flux which generate | occur | produces around the composite type reactor of 1st Embodiment. It is a figure which shows typically an example of the conventional composite reactor. It is a figure which shows distribution of the leakage magnetic flux which generate | occur | produces around the composite type reactor of FIG. It is a figure which shows typically the composite type reactor of 2nd Embodiment. It is a figure which shows typically the other example of the composite type reactor of 2nd Embodiment. It is a figure which shows typically the composite type reactor of other embodiment. It is a perspective view which shows typically the composite type reactor of other embodiment. It is a perspective view which shows typically the composite type reactor of other embodiment.

  Hereinafter, embodiments of the composite reactor according to the present invention will be described.

  FIG. 1 is a circuit diagram showing an example of a two-phase interleaved DC / DC converter to which a composite reactor according to the present invention can be applied. The two-phase interleaved DC / DC converter shown in FIG. 1 includes a smoothing capacitor C1, a composite reactor 1 having two coils 2 and 3, a switch unit SW1, SW2, SW3 and SW4, and a smoothing capacitor C2. Prepare. When the DC / DC converter operates with the voltage V1 on the smoothing capacitor C1 side as an input voltage and the voltage V2 on the smoothing capacitor C2 side as an output voltage, the DC / DC converter boosts the input voltage V1. Conversely, when the voltage V2 on the smoothing capacitor C2 side is used as the input voltage and the voltage V1 on the smoothing capacitor C1 side is used as the output voltage, the DC / DC converter steps down the input voltage V2.

  Switch portions SW1 and SW2 are connected to the coil 2 of the composite reactor 1, and switch portions SW3 and SW4 are connected to the coil 3 of the composite reactor 1. Each of the switch units SW1, SW2, SW3, and SW4 includes a switching element such as an IGBT (Insulated Gate Bipolar Transistor) and a reflux diode connected in parallel to the switching element.

  Each switching element of the switch units SW1 to SW4 is on / off controlled by a signal from a switching control unit (not shown). However, the switching control unit turns off the switching element of the switch unit SW2 when turning on the switching element of the switch unit SW1, and conversely, when switching off the switching element of the switch unit SW1, The switching element of the unit SW2 is turned on. Similarly, when the switching control unit switches on the switching element of the switch unit SW3, the switching control unit controls off of the switching unit of the switch unit SW4, and conversely, when switching off the switching element of the switch unit SW3, The switching element of the switch unit SW4 is turned on.

  FIG. 2 is a graph illustrating an example of a current change according to switching control of the switch units SW1 to SW4 in the DC / DC converter illustrated in FIG. FIG. 2 shows a current I1 flowing through the coil 2 of the composite reactor 1, a current I2 flowing through the coil 3 of the composite reactor 1, and a combined current Ic of the currents I1 and I2 according to the switching control of the switch units SW1 to SW4. Each change is shown. As shown in FIG. 2, when the switch unit SW2 is turned on and the switch unit SW1 is turned off, the current I1 flowing through the coil 2 of the composite reactor 1 increases, the switch unit SW2 is turned off, and the switch unit SW1 is turned on. When the ON control is performed, the current I1 decreases. Similarly, when the switch unit SW4 is turned on and the switch unit SW3 is turned off, the current I2 flowing through the coil 3 of the composite reactor 1 increases, the switch unit SW4 is turned off, and the switch unit SW3 is turned on. And current I2 falls. The increase / decrease in the current differs depending on the time ratio (duty ratio) of the switch units SW2 and SW4 shown in FIG. 2 and the inductance and coupling rate of the composite reactor 1.

  As shown in FIG. 2, one cycle (Ts) of switching control of the switch units SW1 and SW2 and one cycle (Ts) of switching control of the switch units SW3 and SW4 are shifted in phase by a half cycle (Ts / 2). Yes. As a result, since the combined current Ic of the currents I1 and I2 increases every half cycle (Ts / 2), the two-phase interleaved DC / DC converter is compared with the single-phase type having the same inductance value. Thus, a stable current with a small ripple can be output.

  In the DC / DC converter shown in FIG. 2, since the coil 2 and the coil 3 are magnetically coupled to each other and the turns ratio is 1: 1, the same voltage as that of the coil 2 is induced in the coil 3. The starting points of the windings of the coils 2 and 3 are indicated by dots. In the configuration shown in FIG. 2, the starting point c of the winding of the coil 3 is on the positive side of the power source (Vin), and the starting point a of the winding of the coil 2 is on the negative side of the power source (Vin). For this reason, when the switch part SW2 is turned on and the current I1 flows through the coil 2, the current I2 also occurs in the coil 3 in a direction that cancels the magnetization of the core. Similarly, when the switch unit SW4 is turned on and the current I2 flows through the coil 3, the current I1 also occurs in the coil 2 in a direction that cancels the magnetization of the core.

  Hereinafter, a plurality of embodiments of the composite reactor 1 applicable to the above-described two-phase interleaved DC / DC converter will be described.

(First embodiment)
The composite reactor 10 of 1st Embodiment is demonstrated with reference to FIGS. FIG. 3 is a diagram schematically illustrating the composite reactor according to the first embodiment. As shown in FIG. 3, the composite reactor 10 of the first embodiment includes a magnetic core 11 and two coils 12 and 13 wound around the magnetic core 11 as a common core.

  The magnetic core 11 has a first core portion 11 a and a second core portion 11 b that are substantially U-shaped in plan view and can be divided and have the same shape. In addition, the 1st core part 11a and the 2nd core part 11b are each comprised by laminating | stacking the silicon steel plate or dust core etc. which are magnetic materials. The first core portion 11a and the second core portion 11b are coupled in a state in which the concave portions of the respective core portions face each other, and two opposite end surfaces of the other core portion overlap each other on two end surfaces of the one core portion. The The planar view shape of the magnetic core 11 that combines the first core portion 11a and the second core portion 11b is a rectangular loop shape with four corners dropped. The winding of the coil 12 is wound around the first core portion 11a, and the winding of the coil 13 is wound around the second core portion 11b. The planar view shape of the magnetic core 11 may be a complete rectangular loop shape having four corners.

  The coil 12 is divided and wound into a first winding portion 12a and a second winding portion 12b. The first winding portion 12a and the second winding portion 12b are wound around the winding center axes Z11 and Z12 of the winding portions around the winding portions constituting the two opposing sides of the first core portion 11a. The In the example shown in FIG. 3, the winding of the first winding portion 12a is wound around one winding portion of the first core portion 11a around the winding center axis Z11. The winding of the second winding portion 12b is wound around the winding center axis Z12 around the other winding portion of the first core portion 11a. The number of turns of the first winding part 12a and the second winding part 12b is the same.

  Similarly, the coil 13 is divided and wound into a third winding portion 13a and a fourth winding portion 13b. The third winding portion 13a and the fourth winding portion 13b are wound around the winding center axes Z13 and Z14 of the winding portions around the winding portions constituting the two opposing sides of the second core portion 11b. The In the example shown in FIG. 3, the winding of the third winding portion 13a is wound around one winding portion of the second core portion 11b around the winding center axis Z13. The winding of the fourth winding portion 13b is wound around the winding center axis Z14 around the other winding portion of the second core portion 11b. The number of turns of the third winding portion 13a and the fourth winding portion 13b is the same.

  According to the magnetic core 11 of the present embodiment, the winding center axis Z11 of one winding portion of the first core portion 11a and the winding center axis Z13 of one winding portion of the second core portion 11b are In common, the winding center axis Z12 of the other winding part of the first core part 11a and the winding center axis Z14 of the other winding part of the second core part 11b are common. The winding center axis Z11 and the winding center axis Z12 are parallel, and the winding center axis Z13 and the winding center axis Z14 are parallel. The winding center axes Z11 to Z14 are all included on the same plane.

  FIG. 4 is an exploded perspective view illustrating a split winding configuration of the winding portion of each coil of the composite reactor 10 of the first embodiment. A terminal a shown in FIG. 4 indicates the starting point of the winding of the coil 12, and a terminal b indicates the end point of the winding of the coil 12. The terminal a is also the starting point of the first winding part 12a of the coil 12, and the terminal b is also the end point of the second winding part 12b of the coil 12. The terminals a and b are the same as the relationship between the terminals a and b shown in FIG. 4 indicates the starting point of the winding of the coil 13, and the terminal d indicates the end of the winding of the coil 13. The terminal c is also the starting point of the third winding part 13 a of the coil 13, and the terminal d is also the end point of the fourth winding part 13 b of the coil 13. The terminals c and d are the same as the relationship between the terminals c and d shown in FIG.

  The winding of the coil 12 is wound around one winding portion of the first core portion 11a counterclockwise when viewed in the direction of arrow A shown in FIG. 4 parallel to the winding center axis Z11. After configuring the wire portion 12a, the wire portion 12a is guided to the other winding portion side of the first core portion 11a, and is wound around the other winding portion in a clockwise direction when viewed in the arrow A direction parallel to the winding center axis Z12. The second winding portion 12b is configured by being rotated. Further, the winding of the coil 13 is wound around one winding portion of the second core portion 11b in a clockwise direction when viewed in the direction of arrow A parallel to the winding center axis Z13, and the third winding portion 13a. After being configured, the second core portion 11b is guided to the other winding portion side, and is wound around the other winding portion counterclockwise when viewed in the direction of arrow A parallel to the winding center axis Z14. Thus, the fourth winding portion 13b is configured. Therefore, the direction of the magnetic flux in the first core portion 11a by the first winding portion 12a is opposite to the direction of the magnetic flux in the second core portion 11b by the third winding portion 13a. Similarly, the direction of the magnetic flux in the first core portion 11a by the second winding portion 12b is opposite to the direction of the magnetic flux in the second core portion 11b by the fourth winding portion 13b.

  Moreover, since the shape of the 1st core part 11a and the shape of the 2nd core part 11b are equal, and the coils 12 and 13 are symmetrically arrange | positioned centering | focusing on the coupling surface in each core part, the magnetic flux produced by the coil 12 is the same. The magnetic path MP2 in the first core portion 11a and the magnetic path MP3 in the second core portion 11b of the magnetic flux generated by the coil 13 have a common rectangular shape, and the magnetic path lengths of the two magnetic paths MP2 and MP3 are equal.

  FIG. 5 is a diagram illustrating a part of the magnetic flux generated around the reactor configured by the coil 12 and the first core portion 11a in the composite reactor 10 of the first embodiment. The first winding portion 12a and the second winding portion 12b of the coil 12 are the same around the winding center axes Z11 and Z12 as the winding portions along the winding center axes Z11 and Z12 of the first core portion 11a. It is wound with the number of turns. Further, as shown in FIG. 4, the winding direction around the winding center axis Z11 of the first winding portion 12a is opposite to the winding direction around the winding center axis Z12 of the second winding portion 12b. The direction. Therefore, as shown in FIG. 5, the magnetic flux Φ1 generated around the first winding portion 12a and the magnetic flux Φ2 generated around the second winding portion 12b act so as to cancel each other around the coil 12. To do.

  Similarly, the third winding portion 13a and the fourth winding portion 13b of the coil 13 are respectively provided with the winding center axes Z13 and Z14 at the winding portions along the winding center axes Z13 and Z14 of the second core portion 11b. It is wound in the center with the same number of turns. As shown in FIG. 4, the winding direction around the winding center axis Z13 of the third winding portion 13a is opposite to the winding direction around the winding center axis Z14 of the fourth winding portion 13b. The direction. Therefore, the magnetic flux generated around the third winding portion 13 a and the magnetic flux generated around the fourth winding portion 13 b act so as to cancel each other around the coil 13.

  FIG. 6 is a diagram illustrating an example of a distribution of leakage magnetic flux generated around the composite reactor 10 of the first embodiment. As described above, the magnetic flux generated around the first winding portion 12a and the magnetic flux generated around the second winding portion 12b cancel each other on the coil 12 side, and the third winding portion on the coil 13 side. The magnetic flux generated around 13a and the magnetic flux generated around the fourth winding portion 13b cancel each other. On the other hand, as a comparison of the leakage magnetic flux generated around the composite reactor 10 of the present embodiment, the configuration of the conventional composite reactor is shown in FIG. 7, and an example of the distribution of the leakage magnetic flux generated around the composite reactor is shown. As shown in FIG. As shown in FIG. 8, the magnetic field around the composite reactor shown in FIG. 7 includes the leakage magnetic flux from one coil and the leakage magnetic flux from the other coil, and the leakage magnetic fluxes cancel each other. Absent. As described above, in the present embodiment, the leakage magnetic flux generated around the composite reactor 10 of the present embodiment is reduced by the magnetic flux generated by one winding portion of each coil canceling the magnetic flux generated by the other winding portion. ing. Even if the magnetic core 11 used in the present embodiment is the same as the conventional one, as described above, the winding direction of each winding portion of each coil is configured as described above, so that leakage occurs. Reduction of magnetic flux can be realized.

  In the present embodiment, as shown in FIG. 3, the direction of the magnetic flux in the first core portion 11a by the first winding portion 12a is the same as the direction of the magnetic flux in the second core portion 11b by the third winding portion 13a. In contrast, the direction of the magnetic flux in the first core portion 11a by the second winding portion 12b is opposite to the direction of the magnetic flux in the second core portion 11b by the fourth winding portion 13b. For this reason, the magnetic saturation of the magnetic core 11 is less likely to occur, and the composite reactor 10 of this embodiment functions sufficiently as a magnetically coupled reactor.

  Moreover, in this embodiment, the 1st core part 11a and the 2nd core part 11b which comprise the magnetic core 11 are the same shapes, and each center axis | shaft of the 1st winding part 12a of the coil 12, and the 2nd winding part 12b The winding center axes Z11, Z12 and the winding center axes Z13, Z14, which are the center axes of the third winding portion 13a and the fourth winding portion 13b of the coil 13, are included in the same plane. The winding center axis Z11 and the winding center axis Z13 are common, and the winding center axis Z12 and the winding center axis Z14 are common. The winding center axis Z11 and the winding center axis Z12 are parallel, and the winding center axis Z13 and the winding center axis Z14 are parallel. Further, the magnetic path of the magnetic flux generated by the coil 12 in the first core portion 11a and the magnetic path of the magnetic flux generated by the coil 13 in the second core portion 11b have a common shape, and the magnetic paths of these two magnetic paths are the same. The road length is equal. Therefore, the magnetic flux generated around each coil is balanced, and the leakage magnetic flux around the composite reactor 10 of the present embodiment can be efficiently reduced.

  Furthermore, since the magnetic core 11 is composed of the first core portion 11a and the second core portion 11b having the same shape, the two core portions are wound after winding the coil winding around each non-integrated core portion. By combining these, the composite reactor 10 of this embodiment can be easily manufactured.

(Second Embodiment)
FIG. 9 is a diagram schematically illustrating a composite reactor according to the second embodiment. The difference between the composite reactor 20 of the second embodiment and the composite reactor 10 of the first embodiment is the shape of the core. For this reason, the same code | symbol or an equivalent code | symbol is attached | subjected to the component same or equivalent to the composite reactor 10 of 1st Embodiment, and description is simplified or abbreviate | omitted.

  The magnetic core 21 included in the composite reactor 20 of the second embodiment includes a first core portion 21a and a second core portion 21b that are split and have the same shape and are substantially C-shaped in plan view. In addition, the 1st core part 21a and the 2nd core part 21b are each comprised by laminating | stacking the silicon steel plate or dust core etc. which are magnetic materials. The first core portion 21a and the second core portion 21b are coupled in a state in which the concave portions of the respective core portions face each other, and the two opposite end surfaces of the other core portion overlap the two end surfaces of the one core portion. The The planar view shape of the magnetic core 21 which couple | bonds the 1st core part 21a and the 2nd core part 21b is an annular | circular shape. In addition, as shown in FIG. 10, the cyclic | annular magnetic core in which the planar view shape which couple | bonded the 1st core part 21a and the 2nd core part 21b may be an ellipse may be sufficient.

  Moreover, since the shape of the 1st core part 21a and the shape of the 2nd core part 21b are equal, and the coils 12 and 13 are symmetrically arrange | positioned centering | focusing on the coupling surface in each core part, the magnetic flux produced by the coil 12 is the same. The magnetic path in the first core portion 21a and the magnetic path in the second core portion 21b of the magnetic flux generated by the coil 13 have a common annular shape, and the magnetic path lengths of the two magnetic paths are equal.

  Also in this embodiment, as in the first embodiment, the winding of the coil 12 is wound on the first core portion 21a by split winding, and the winding of the coil 13 is split on the second core portion 21b. It is wound. The first winding portion 12a and the second winding portion 12b of the coil 12 are wound around the winding center axes Z21, Z22 along the winding center axes Z21, Z22 of the first core portion 21a shown in FIG. Is wound at the same number of turns. The winding direction around the winding center axis Z21 of the first winding portion 12a is opposite to the winding direction around the winding center axis Z22 of the second winding portion 12b. Therefore, the magnetic flux generated around the first winding portion 12 a and the magnetic flux generated around the second winding portion 12 b act so as to cancel each other around the coil 12.

  Similarly, the third winding portion 13a and the fourth winding portion 13b of the coil 13 are wound around the winding center axis along the winding center axes Z23 and Z24 of the second core portion 21b shown in FIG. It is wound with the same number of turns around Z23 and Z24. The winding direction around the winding center axis Z23 of the third winding portion 13a is opposite to the winding direction around the winding center axis Z24 of the fourth winding portion 13b. Therefore, the magnetic flux generated around the third winding portion 13 a and the magnetic flux generated around the fourth winding portion 13 b act so as to cancel each other around the coil 13.

  Therefore, the magnetic flux generated around the first winding portion 12a and the magnetic flux generated around the second winding portion 12b cancel each other on the coil 12 side, and around the third winding portion 13a on the coil 13 side. Since the generated magnetic flux and the magnetic flux generated around the fourth winding portion 13b cancel each other, the leakage magnetic flux generated around the composite reactor 20 of the second embodiment is small.

  In the present embodiment, as shown in FIG. 9, the direction of the magnetic flux in the first core portion 21 a by the first winding portion 12 a of the coil 12 is the second core portion by the third winding portion 13 a of the coil 13. This is almost opposite to the direction of the magnetic flux in 21b. Similarly, the direction of the magnetic flux in the first core portion 21a by the second winding portion 12b of the coil 12 is substantially opposite to the direction of the magnetic flux in the second core portion 21b by the fourth winding portion 13b of the coil 13. For this reason, magnetic saturation of the magnetic core 21 is less likely to occur, and the composite reactor 20 of the present embodiment can sufficiently function as a magnetically coupled reactor.

  Moreover, in this embodiment, as shown in FIG. 9, the 1st core part 21a and the 2nd core part 21b which comprise the magnetic core 21 are the same shapes, and the winding center of each winding part of the 1st core part 21a The axes Z21 and Z22 and the winding center axes Z23 and Z24 of the winding portions of the second core portion 21b are all included in the same plane. Furthermore, the magnetic path of the magnetic flux generated by the coil 12 in the first core portion 21a and the magnetic path of the magnetic flux generated by the coil 13 in the second core portion 21b have a common shape, and the magnetic paths of these two magnetic paths are the same. The road length is equal. Therefore, the magnetic flux generated around each coil is balanced, and the leakage magnetic flux around the composite reactor 10 of the present embodiment can be efficiently reduced.

  Further, since the magnetic core 21 is composed of the first core portion 21a and the second core portion 21b having the same shape, the two core portions are wound after winding the coil winding around each unintegrated core portion. By combining these, the composite reactor 20 of the present embodiment can be easily manufactured.

  In the composite reactors of the first and second embodiments described above, the two core parts constituting the magnetic cores 11 and 21 have the same shape, but the area and shape of the end faces are different as shown in FIG. The two core portions 31a and 31b may be combined to form a rectangular loop-shaped or annular magnetic core 31. In this case, it is only necessary that the two end surfaces of the one core portion overlap the two opposite end surfaces of the other core portion so that the respective end surfaces do not completely overlap and a part of the end surface overlaps. Even in this configuration, in each of the coils 12 and 13, the magnetic flux generated around one winding portion and the magnetic flux generated around the other winding portion act so as to cancel each other, and the magnetic coupling type Works well as a reactor.

  Moreover, as shown in FIG. 12, the structure by which the level | step difference was provided between one winding part of each core part 41a, 41b and the other winding part may be sufficient. In this case, the plane including the winding center axis Z41 of one winding portion of the first core portion 41a and the winding center axis Z43 of one winding portion of the second core portion 41b, and the other of the first core portion 41a This is a plane different from the plane including the winding center axis Z42 of the winding portion and the winding center axis Z44 of the other winding portion of the second core portion 41b. Even in this configuration, in each of the coils 12 and 13, the magnetic flux generated around one winding portion and the magnetic flux generated around the other winding portion cancel each other, and the magnetically coupled reactor As well as it works.

  Further, as shown in FIG. 13, the first core part 51a and the second core part 51b constituting the magnetic core 51 have the same shape, but the second core part 51b is shifted with respect to the first core part 51a, The first core portion 51a and the second core portion 51b are coupled with the winding center axes Z51 and Z52 of the first core portion 51a and the winding center axes Z53 and Z54 of the second core portion 51b being shifted from each other. Also good. In this case, the plane including the winding center axis Z51 of one winding portion of the first core portion 51a and the winding center axis Z52 of the other winding portion, and the winding of one winding portion of the second core portion 51b. The plane is different from the plane including the line center axis Z53 and the winding center axis Z54 of the other winding portion. Even in this configuration, in each of the coils 12 and 13, the magnetic flux generated around one winding portion and the magnetic flux generated around the other winding portion cancel each other, and the magnetically coupled reactor As well as it works.

  Furthermore, an air gap may be provided between one core part and the other core part constituting the magnetic core described above. If it is the structure which provided the air gap, compared with the structure without an air gap, the space | interval of the 1st winding part 12a of the coil 12, and the 3rd winding part 13a of the coil 13, and the 2nd winding part of the coil 12 The distance between 12b and the fourth winding portion 13b of the coil 13 can be narrowed. The cross-sectional shape perpendicular to the winding central axis of each core portion of the magnetic core may be rectangular or circular.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. For example, the composite reactor according to the present invention is applicable to a DC / DC converter that performs only step-up or a DC / DC converter that performs only step-down, in addition to the DC / DC converter that performs step-up / step-down shown in FIG. .

10, 20 Composite reactor 11, 21, 31, 41, 51 Magnetic cores 11a, 21a, 31a, 41a, 51a First core part 11b, 21b, 31b, 41b, 51b Second core part 12 Coil 12a First winding Part 12b Second winding part 13 Coil 13a Third winding part 13b Fourth winding part MP2, MP3 Magnetic paths Z11-Z14, Z21-Z24, Z41-Z44, Z51-Z54 Winding central axis

Claims (10)

A composite reactor comprising a magnetic core, and a first coil and a second coil disposed on the magnetic core using the magnetic core as a common core,
The magnetic core has a first core part around which the winding of the first coil is wound, and a second core part around which the winding of the second coil is wound,
The first coil has a first winding portion and a second winding portion that are separately wound on different winding center axes,
The first winding part and the second winding part are respectively arranged in directions in which magnetic fluxes interlinking around the first coil cancel each other,
The second coil has a third winding portion and a fourth winding portion that are separately wound on different winding center axes,
The third winding portion and the fourth winding portion are respectively arranged in directions in which magnetic fluxes interlinking around the second coil cancel each other,
The direction of the magnetic flux in the first core portion by the first winding portion is substantially opposite to the direction of the magnetic flux in the second core portion by the third winding portion,
The composite reactor in which the direction of the magnetic flux in the first core portion by the second winding portion is substantially opposite to the direction of the magnetic flux in the second core portion by the fourth winding portion. The composite reactor according to claim 1,
The winding central axis of the first winding part and the winding central axis of the third winding part are common, and the winding central axis of the second winding part and the winding of the fourth winding part A compound reactor with a common line center axis. The composite reactor according to claim 1,
A composite reactor in which an end surface of the first core portion facing the second core portion and an end surface of the second core portion facing the first core portion at least partially overlap each other. The composite reactor according to any one of claims 1 to 3,
The winding central axis of the first winding portion and the winding central axis of the second winding portion are parallel to each other;
A composite reactor in which a winding central axis of the third winding portion and a winding central axis of the fourth winding portion are parallel to each other. The composite reactor according to any one of claims 1 to 4,
A composite reactor in which the winding central axes of the first winding portion, the second winding portion, the third winding portion, and the fourth winding portion are included on the same plane. The composite reactor according to any one of claims 1 to 4,
The first plane including each winding center axis of the first winding part and the third winding part, and the second plane including each winding center axis of the second winding part and the fourth winding part A complex reactor that is a different plane. The composite reactor according to any one of claims 1 to 4,
The first plane including each winding center axis of the first winding portion and the second winding portion, and the second plane including each winding center axis of the third winding portion and the fourth winding portion. A complex reactor that is a different plane. A composite reactor according to any one of claims 1 to 7,
A composite reactor in which a magnetic path length of the magnetic flux generated by the first coil in the magnetic core is equal to a magnetic path length of the magnetic flux generated by the second coil in the magnetic core. The composite reactor according to claim 8,
The magnetic path in the magnetic core of the magnetic flux generated by the first coil and the magnetic path in the magnetic core of the magnetic flux generated by the second coil have a common shape of an annular or rectangular loop shape. The composite reactor according to any one of claims 1 to 9,
The first core portion and the second core portion are formed in the same shape, and the magnetic core is configured by combining the first core portion and the second core portion.

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