JP6552327B2 - Power converter - Google Patents

Description

  The present invention relates to a power converter.

  Conventionally, high-voltage batteries for driving a main motor are mounted on electric vehicles such as HEV (Hybrid Electric Vehicle) and EV (Electric Vehicle). In addition, electric vehicles use DC / DC converters (power converters) that convert power from high-voltage systems to low-voltage systems in order to use in-vehicle loads such as in-vehicle electrical components such as electric power steering and electric mirrors. have. The conventional DC / DC converter is described, for example, in Patent Document 1.

Japanese Patent Application Laid-Open No. 2003-188032

  In such an in-vehicle DC / DC converter, the input voltage of the high voltage system is several hundred volts, while the rated voltage of each in-vehicle electrical component is 10 to 15 volts, and the voltage ratio between the input voltage and the output voltage is large.

  Therefore, when power conversion is performed in the DC / DC converter, the current on the secondary side of the transformer becomes extremely large. Therefore, the amount of heat generation of the coil on the secondary side is increased, and there is a possibility that the other parts of the DC / DC converter may be heated to have an adverse effect.

  An object of the present invention is to provide a power converter capable of efficiently dissipating heat generated from a coil on the secondary side.

According to a first aspect of the present invention, there is provided a transformer for transformer including a primary coil, a secondary coil, and a core, and a heat sink having a mounting surface on which the transformer for transformer is mounted; The primary side coil includes a coil portion surrounding the columnar core portion, and the secondary side coil includes a first flat coil component and a second flat coil component. And the heat sink has a mounting portion whose upper surface is the mounting surface, a contact portion which is integrally formed with the mounting portion and protrudes upward from the mounting surface, and the mounting portion. A first fin portion that is thermally connected, and the first flat plate coil component surrounds the columnar core portion in an arc shape, and extends in a plane substantially parallel to the mounting surface. A plate-like first output portion extending from one end of the first electromotive unit, and the other end of the first electromotive unit A plate-like first grounding portion extending from the plate-like first electromotive portion, the second plate coil component surrounding the columnar core portion in an arc shape and extending substantially parallel to the mounting surface. And a plate-like second output portion extending from one end of the second electromotive portion, and a plate-like second ground portion extending from the other end of the second electromotive portion, and the contact portion It has a first contact surface that extends substantially parallel to the mounting surface and contacts the first ground portion, and a second contact surface that extends substantially parallel to the mounting surface and contacts the second ground portion. The first ground portion is a flat plate extending substantially in parallel to the mounting surface on the same plane as the first electromotive portion, and the second ground portion is the same as the second electromotive portion. It is a flat plate which spreads in a plane substantially parallel to the mounting surface described above .

A second invention of the present application is the power conversion device of the first invention , wherein the end of the first ground portion and the end of the second ground portion are different in vertical position, and the first contact surface And the second contact surface constitute a stepped portion having different vertical positions.

A third invention of the present application is the power conversion device according to the first invention or the second invention , wherein the first output portion extends substantially parallel to the mounting surface on the same plane as the first electromotive portion. It is flat form, and the said 2nd output part is flat form extended substantially parallel to the above-mentioned mounting surface on the same plane as the said 2nd electromotive part.

A fourth invention of the present application is the power converter according to any one of the first invention to the third invention , wherein both of the first flat coil component and the second flat coil component are substantially parallel to the mounting surface described above. It is a flat plate shape that spreads out.

A fifth invention of the present application is the power converter according to any one of the first invention to the fourth invention , wherein the first flat coil component and the second flat coil component are disposed vertically one over the other. An insulating component is disposed between the first flat coil component and the second flat coil component.

A sixth invention of the present application is the power converter according to any of the first invention to the fifth invention , wherein the first flat coil component and the second flat coil component have the same shape.

A seventh invention of the present application is the power conversion device according to any one of the first invention to the sixth invention , wherein the first ground portion and the second ground portion include the first output portion and the second output portion. Arranged between.

According to the first to seventh inventions of the present application, the first flat plate coil component and the second flat plate coil component are in direct contact with the heat sink, whereby the grounding of the secondary coil and the heat transfer to the heat sink are simultaneously performed. Therefore, the heat generated from the coil on the secondary side can be efficiently dissipated.
Further, each of the first ground portion and the second ground portion is in the form of a flat plate that extends substantially in parallel to the mounting surface on the same plane as the first electromotive portion and the second electromotive portion. Thereby, the dimensional error of the first ground portion and the second ground portion can be suppressed. Therefore, the first grounding portion and the second grounding portion can be more reliably brought into surface contact with the first contact surface and the second contact surface. As a result, the first ground portion and the second ground portion, and the first contact surface and the second contact surface can be electrically connected more reliably, and the heat transfer efficiency can be further enhanced.

In particular, according to the second invention of the present application, even when the positions in the vertical direction of the end portion of the first ground portion and the end portion of the second ground portion are different, the first ground portion and the first ground portion can be 2 It can be connected to both grounding parts. Thereby, the rigidity of the contact portion is improved as compared to the case where two contact portions are provided.

In particular, according to the third invention of the present application, dimensional error of the first output part and the second output part can be suppressed.

In particular, according to the fourth invention of the present application, all flat coil parts have a flat shape. Thereby, the formation process of a flat plate coil component can be simplified. Moreover, the dimensional error as the whole flat coil component can be suppressed.

In particular, according to the fifth invention of the present application, it is not necessary to perform insulation processing such as insulating coating on the surface of the flat coil component by arranging the insulating component between the flat coil components. As a result, since the surface of the ground portion and the surface of the output portion is not insulated, it is easy to connect the ground and the output side.

In particular, according to the sixth invention of the present application, it is easy to invert the front and back and arrange them in left-right symmetry. For this reason, production efficiency improves.

In particular, according to the seventh invention of the present application, the first ground portion and the second ground portion may be connected to the vertically extending contact portions, so there may be no margin in the periphery. On the other hand, in order to connect the first output part and the second output part with the diodes of the rectifier circuit through the connection member etc., it is preferable to arrange them at both ends having a margin at the periphery.

It is a circuit diagram showing a power converter concerning a 1st embodiment. It is a perspective view of a power converter concerning a 1st embodiment. It is an exploded perspective view of a transformer concerning a 1st embodiment. It is a fragmentary sectional view of the transformer and heat sink concerning a 1st embodiment.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the present application, the shape and positional relationship of each part will be described with the plane parallel to the placement surface of the heat sink as the horizontal plane and the placement surface side with respect to the heat sink as the top. However, the definition in the vertical direction is not intended to limit the direction of use of the power conversion device according to the present invention.

<1. First Embodiment>
<1-1. Circuit configuration of DC / DC converter>
First, the circuit configuration of the power conversion device 1 according to the first embodiment will be described with reference to FIG. FIG. 1 is a circuit diagram showing a configuration of a power conversion device 1 according to a first embodiment of the present invention.

  The power conversion device 1 is mounted on a plug-in type electric vehicle such as a plug-in type HEV (Hybrid Electric Vehicle) or a plug-in type EV (Electric Vehicle), and receives a DC input voltage Vin input from a high voltage power system. It is a DC / DC converter that converts DC output voltage Vout and outputs it to a low voltage power system.

  The power conversion device 1 converts high voltage power of about several hundred volts output from the main battery of the electric vehicle into low voltage power of about 14 volts and outputs it to the sub battery. The sub battery charges the power input from the power conversion device 1 and supplies a constant voltage of about 12 volts to the load for each vehicle such as power window, power steering, fuel pump, lighting equipment, audio, etc. Do.

  As shown in FIG. 1, the power conversion device 1 includes an input terminal 11, an output terminal 12, a first intermediate terminal 13, a second intermediate terminal 14, a third intermediate terminal 15, a switching circuit 20, a transformer 30, a rectifier circuit 40, The smoothing circuit 50 and the control unit 10 are included.

  The input terminal 11 is an input terminal of the power conversion device 1 and an input terminal of the switching circuit 20. The output terminal 12 is an output terminal of the power conversion device 1 and an output terminal of the smoothing circuit 50. The first intermediate terminal 13 is an output terminal of the switching circuit 20 and an input terminal of the transformer 30. The second intermediate terminal 14 is an output terminal of the transformer 30 and an input terminal of the rectifier circuit 40. The third intermediate terminal 15 is an output terminal of the rectifier circuit 40 and an input terminal of the smoothing circuit 50.

  The switching circuit 20 converts the DC voltage Vout input from the input terminal 11 into an AC voltage, and outputs the AC voltage to the first intermediate terminal 13. The switching circuit 20 is a full bridge circuit in which four switching elements 21 to 24 are connected in a full bridge shape. In the present embodiment, field effect transistors (FETs) are used as the switching elements 21 to 24.

  The pair of switching elements 21 and 22 are sequentially connected in series between the two input terminals 11. The other pair of switching elements 23 and 24 are also connected in series between the two input terminals 11 in order. That is, the pair of switching elements 21 and 22 and the other pair of switching elements 23 and 24 are connected in parallel.

  Switching signals are input from the control unit 10 to the gate terminals of the switching elements 21 to 24, respectively. This switching signal is a PWM signal having a binary voltage value of an ON signal and an OFF signal. When the control unit 10 inputs a switching signal to the switching elements 21 to 24, the switching elements 21 to 24 are turned on / off, and AC power is output between the two first intermediate terminals 13.

  The transformer 30 has a primary coil 31, a secondary coil 32 and a core 33. The transformer 30 transforms the AC power input to the first intermediate terminal 13 in accordance with the winding ratio between the primary coil 31 and the secondary coil 32.

  The primary coil 31 is connected between the two first intermediate terminals 13. The secondary coil 32 includes a first winding 321 and a second winding 322. One end of the first winding 321 is connected to one of the pair of second intermediate terminals 14. The other end of the first winding 321 and one end of the second winding 322 are both grounded. Further, the other end of the pair of second intermediate terminals 14 is connected to the other end of the second winding 322. The core 33 is a magnetic circuit which couples the primary coil 31 and the secondary coil 32 by mutual inductance.

  The rectifier circuit 40 is a circuit that rectifies AC power output from the transformer 30. The rectifier circuit 40 has two diodes 41. Each diode 41 has a cathode side connected to each of the two second intermediate terminals 14. The two diodes 41 are both connected to the single third intermediate terminal 15 on the anode side.

  The AC power inverted from the transformer 30 is input to each of the two second intermediate terminals 14. The rectification circuit 40 outputs full-wave rectified power to the third intermediate terminal 15 by half-wave rectifying and adding each of the inverted AC powers.

  The smoothing circuit 50 includes a choke coil 51 and a capacitor 52. The smoothing circuit 50 smoothes the power output from the transformer 30 and full-wave rectified by the rectifier circuit 40. Thereby, the smoothing circuit 50 outputs DC output power having the output voltage Vout to the output terminal 12.

  The control unit 10 outputs a switching signal to the switching elements 21 to 24 of the switching circuit 20. The control unit 10 of the present embodiment is realized by a so-called PWM-IC.

<1-2. Device configuration of DC / DC converter>
Next, the power converter 1 will be described with reference to FIG. FIG. 2 is a perspective view of the power conversion device 1. In FIG. 2, connection members and wires are not shown.

  As shown in FIG. 2, in addition to the above-described circuit configuration shown in FIG. 1, the power conversion device 1 has a heat sink 60 as a heat dissipation member for dissipating the heat generated from each part.

  The heat sink 60 has a plate-like mounting portion 61, a plurality of heat radiation fins 62 disposed below the mounting portion 61, and a contact portion 63 projecting upward from the upper surface of the mounting portion 61. . The heat sink 60 is formed of a conductive metal and is electrically grounded.

  The placement unit 61 has a placement surface 610 on which the transformer 30 is placed. The placement surface 610 is the upper surface of the placement unit 61. As shown in FIG. 2, the mounting surface 610 is a substantially rectangular surface that extends substantially horizontally. Here, as shown in FIG. 2, the longitudinal direction of the mounting surface 610 is referred to as the x direction, the short direction is referred to as the y direction, and the upward direction orthogonal to the x direction and the y direction is referred to as the z direction.

  The plurality of radiation fins 62 extend downward in a plate shape from the lower surface of the mounting portion 61. In the present embodiment, the radiating fins 62 are formed integrally with the placement portion 61. In addition, if the radiation fin 62 is connected with the mounting part 61 and is thermally connected to the mounting part 61 (that is, if heat conduction is possible between the mounting part 61), the mounting part 61 will be described. It may be formed by a separate member.

  A transformer 30 is placed at substantially the center of the placement surface 610. The switching circuit 20 is mounted on the mounting surface 610 via the insulating sheet 25 in the (+ x) direction of the transformer 30. On the other hand, in the (−x) direction of the transformer 30, the rectifying circuit 40 and the smoothing circuit 50 are mounted on the mounting surface 610 via the insulating sheet 42.

  FIG. 3 shows the disassembler of the transformer 30. As shown in FIG. 3, the transformer 30 includes two core members 71 and 72, a helical coil component 73, a first flat coil component 74, a second flat coil component 75, and insulating components 81 to 84.

  The two core members 71 and 72 are each formed in an E shape from ferrite. The core 33 of the transformer 30 is configured by the two core members 71 and 72 overlapping in the vertical direction.

  The upper core member 71 has a plate-like upper plate portion 711 extending in the y direction, two upper side wall portions 712 extending downward from both ends of the upper plate portion 711 in the y direction, and a substantially central lower surface of the upper plate portion 711 And an upper columnar portion 713 extending downward from the The lower core member 72 includes a plate-like lower plate portion 721 extending in the y direction, two lower side wall portions 722 extending upward from both ends in the y direction of the lower plate portion 721, and the upper surface of the lower plate portion 721. And a lower columnar portion 723 extending upward from the center.

  When the two core members 71 and 72 are overlapped, the lower end surfaces of the two upper side wall portions 712 and the upper end surfaces of the two lower side wall portions 722 are connected to each other. Further, the lower end surface of the upper columnar portion 713 and the upper end surface of the lower columnar portion 723 are connected. The upper columnar portion 713 and the lower columnar portion 723 constitute a substantially cylindrical columnar core portion 331 (see FIG. 4) extending vertically.

  The spiral coil component 73 includes a coil portion 731 configured by spirally winding a plate-like bus bar, and two input portions 732 extending from both ends of the coil portion 731 in the (−x) direction. The coil portion 731 is disposed so as to surround the columnar core portion 331. The two input parts 732 are connected to the switching circuit 20 by connection members and wires (not shown). The coil portion 731 constitutes a primary coil 31.

  The first flat plate coil component 74 is a metal component having a first electromotive unit 741, a first output unit 742, and a first ground unit 743. The first electromotive unit 741 surrounds the columnar core portion 331 in an arc shape, and extends in a flat plate shape substantially in parallel to the mounting surface 610. The first electromotive unit 741 constitutes the first winding 321 of the secondary coil 32. The first output portion 742 is a plate-like portion extending in the (−x) direction from one end of the first electromotive portion 741. The first ground portion 743 is a plate-like portion extending in the (−x) direction from the other end of the first electromotive portion 741.

  The second flat plate coil component 75 is a metal component having a second electromotive unit 751, a second output unit 752, and a second ground unit 753. The second electromotive portion 751 surrounds the columnar core portion 331 in an arc shape, and spreads in a plate shape substantially parallel to the mounting surface 610. A second winding 322 of the secondary coil 32 is configured by the second electromotive unit 751. The second output portion 752 is a plate-like portion extending from one end of the second electromotive portion 751 in the (−x) direction. The second ground portion 753 is a plate-like portion extending in the (−x) direction from the other end of the second electromotive portion 751.

  The first output portion 742 and the second output portion 752 are connected to the rectifier circuit 40 by a connection member and a wire (not shown), respectively.

  The core members 71 and 72, the spiral coil component 73, the first flat coil component 74, and the second flat coil component 75 are disposed so as to overlap vertically. Insulating components 81 to 84 are respectively disposed between two vertically adjacent members of core members 71 and 72, helical coil component 73, first flat coil component 74 and second flat coil component 75. This prevents conduction between these members.

  By arranging insulating parts 82 to 85 respectively above and below first flat coil component 74 and second flat coil component 75, insulation such as insulation coating is provided on the surfaces of first flat coil component 74 and second flat coil component 75. There is no need to process. For this reason, the first flat coil component 74 and the second flat coil component 75 of the present embodiment are not coated with insulation. Accordingly, the surfaces of the first output unit 742, the first grounding unit 743, the second output unit 752, and the second grounding unit 753 are not insulated. Therefore, it is easy to ensure electrical connection between the first output unit 742, the first ground unit 743, the second output unit 752, and the second ground unit 753, and the respective connection destinations.

  As shown in FIG. 3, the transformer 30 includes the lower core member 72, the insulating component 81, the spiral coil component 73, the insulating component 82, the first flat coil component 74, the insulating component 83, the second flat coil component 75, and the insulation The parts 84 and the upper core member 71 are assembled in order from the bottom to the top.

  FIG. 4 is a partial cross-sectional view of the heat sink 60 and the transformer 30 as seen from the (−x) direction. In FIG. 4, the illustration of the insulating components 81 to 84 is omitted. As shown in FIGS. 2 and 4, the heat sink 60 has a contact portion 63 projecting upward from the mounting surface 610. The contact portion 63 is integrally formed with the mounting portion 61. The contact portion 63 has, at its upper end, a first contact surface 631 and a second contact surface 632 extending substantially in parallel with the mounting surface 610.

  The lower surface of the end of the first ground portion 743 and the end of the second ground portion 753 are in contact with the first contact surface 631 and the second contact surface 632, respectively. In addition, the first grounding portion 743 is fixed to the contact portion 63 with a screw 641. The second grounding part 753 is fixed to the contact part 63 with a screw 642.

  Since the heat sink 60 is grounded, the first ground portion 743 and the second ground portion 753 are grounded when the first ground portion 743 and the second ground portion 753 contact the contact portions 63, respectively. Further, when the first grounding portion 743 and the second grounding portion 753 are in contact with the contact portion 63, the first flat plate coil component 74 and the second flat plate coil component 75 are in direct contact with the heat sink 60. Thereby, the heat generated from the coils of the first plate coil component 74 and the second plate coil component 75 which are the secondary side coil 32 can be dissipated through the heat sink 60.

  As described above, by simultaneously performing the grounding of the secondary coil 32 and the heat transfer to the heat sink, the heat generated from the secondary coil can be efficiently dissipated.

  Further, the first and second grounding portions 743 and 753 and the contact portion 63 are brought into contact with each other on the surface, whereby electrical connection and thermal connection can be made more reliable.

  As shown in FIGS. 2 and 4, the end of the first ground portion 743 and the end of the second ground portion 753 are different in position in the vertical direction (z direction). Therefore, the positions of the first contact surface 631 and the second contact surface 632 also differ in the vertical direction (z direction). In the present embodiment, the contact portion 63 has a stepped portion 630 configured by the first contact surface 631 and the second contact surface 632.

  Thus, in the present embodiment, a single contact portion 63 having both the first contact surface 631 and the second contact surface 632 is provided. As a result, the width in the y direction of the contact portion can be increased compared to the case where the contact portion 63 having the first contact surface 631 and the contact portion 63 having the second contact surface are separately provided, so that the contact is achieved. The rigidity of the portion 63 can be improved. Further, since both the first ground portion 743 and the second ground portion 753 can be connected to the single contact portion 63, the electrical conditions of the first ground portion 743 and the second ground portion 753 can be made closer to the same. be able to.

  When sufficient space and rigidity are obtained, the contact portion 63 having the first contact surface 631 and the contact portion 63 having the second contact surface may be separately provided.

  In the present embodiment, each of the first flat coil component 74 and the second flat coil component 75 is in the form of a flat plate extending substantially in parallel to the mounting surface 610. That is, both the flat coil parts 74 and 75 have a flat shape. For this reason, the first flat coil component 74 and the second flat coil component 75 do not have bends in the vertical direction (z direction). Thereby, the formation process of flat coil parts 74 and 75 can be simplified. Moreover, the dimensional error as the whole flat coil components 74 and 75 can be suppressed.

  Therefore, each of the first output portion 742 and the first ground portion 743 is in the form of a flat plate spreading substantially in parallel with the placement surface 610 on the same plane as the first electromotive portion 741. Thereby, the dimensional error of the 1st output part 742 and the 1st grounding part 743 can be controlled compared with the case where the 1st output part 742 and the 1st grounding part 743 have a bent part, respectively.

  The second output unit 752 and the second grounding unit 753 each have a flat plate shape that extends substantially parallel to the placement surface 610 on the same plane as the second electromotive unit 751. Thereby, the dimensional error of the 2nd output part 752 and the 2nd grounding part 753 can be suppressed compared with the case where the 2nd output part 752 and the 2nd grounding part 753 have a bent part, respectively.

  By suppressing the dimensional error of the first ground portion 743 and the second ground portion 753, the first ground portion 743 and the first contact surface 631, and the second ground portion 753 and the second contact surface 632, respectively, are more reliable. You can touch the surface. That is, the first ground portion 743 and the first contact surface 631 can be electrically connected more reliably to the second ground portion 753 and the second contact surface 632 respectively.

  In the present embodiment, as shown in FIG. 2, each terminal of the first flat coil component 74 and the second flat coil component 75 (a first output unit 742, a first ground unit 743, a second output unit 752, a second ground) The parts 753) are arranged in the y direction. In addition, the second output portion 752, the first ground portion 743, the second ground portion 753, and the first output portion 742 are disposed in this order from the (−y) direction to the (+ y) direction. Thus, as viewed from above, the first ground portion 743 and the second ground portion 753 are disposed between the first output portion 742 and the second output portion 752.

  The lower surfaces of the first grounding portion 743 and the second grounding portion 753 are in contact with the contact portion 63 that extends vertically. For this reason, the 1st grounding part 743 and the 2nd grounding part 753 do not need margin in the circumference. Therefore, it may be disposed between other terminals in the y direction. On the other hand, since the first output unit 742 and the second output unit 752 are connected to the rectifier circuit 40 via a connecting member or the like, it is preferable that the first output unit 742 and the second output unit 752 are arranged at both ends of the four terminals in consideration of easy connection. .

  Further, as shown in FIG. 3, the first flat coil component 74 and the second flat coil component 75 have the same shape when the front and back are reversed. As described above, by forming the first flat coil component 74 and the second flat coil component 75 into the same shape, the types of components to be produced can be suppressed. In addition, when the transformer 30 is assembled, it is easy to arrange it symmetrically. That is, the production efficiency can be improved.

<2. Modified example>
Although the exemplary embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments.

  In the above embodiment, the primary coil is a coil configured by spirally winding a plate-shaped bus bar, but the present invention is not limited to this. The coil on the primary side may be a coil formed by winding a conducting wire. Also, the coil on the primary side may be divided up and down.

  Moreover, in said embodiment, although the 1st flat coil component and 2nd flat coil component which are coils of secondary side were all arrange | positioned above the coil of primary side, this invention is not this limitation . Both the first flat coil component and the second flat coil component may be disposed below the coil on the primary side, or one of the first flat coil component and the second flat coil component may be on the upper side of the primary coil. The other may be arranged below the primary coil. When the primary side coil is divided, one or both of the first flat plate coil component and the second flat plate coil component may be arranged between the divided primary side coils.

  Further, in the above embodiment, the first electromotive portion of the first flat coil component and the second electromotive portion of the second flat coil component are disposed concentrically as viewed in the vertical direction. The invention is not limited to this. The center of the first electromotive unit and the center of the second electromotive unit may be offset from each other as viewed in the vertical direction.

  In the above embodiment, the terminals of the first flat coil component and the second flat coil component are disposed in the order of the first output unit, the second ground unit, the first ground unit, and the second output unit. The present invention is not limited to this.

  Moreover, in said embodiment, although the columnar core part was a substantially right cylindrical shape, this invention is not limited to this. The shape of the columnar core portion may be an elliptic cylinder, a hexagonal cylinder, or a column other than a true cylinder.

  Moreover, although the power converter device of said embodiment was a DC / DC converter, you may use the structure of this invention for other power converter devices which have transformers, such as an AC / DC converter. In the case of the AC / DC converter, it is sufficient to further include an AC / DC conversion unit that performs rectification and smoothing in the front stage of the DC / DC converter. AC power is input to the AC / DC converter, and DC intermediate power is output. Then, the intermediate power is input as an input power to the DC / DC conversion unit of the DC / DC converter, and a DC output power is output.

  The specific circuit configuration for realizing each part of the power conversion device may be different from the circuit configuration shown in FIG. 2. Moreover, you may combine suitably each element which appeared in said embodiment and modification in the range which does not produce inconsistency.

DESCRIPTION OF SYMBOLS 1 Power converter 30 Transformer 31 Primary side coil 32 Secondary side coil 33 Core 60 Heat sink 61 Mounting part 62 Heat dissipation fin 63 Contact part 74 1st flat coil component 75 2nd flat coil component 81, 82, 83, 84, 85 Insulating parts 331 Columnar core portion 610 Mounting surface 630 Stepped portion 631 First contact surface 632 Second contact surface 713 Upper columnar portion 723 Lower columnar portion 741 First electromotive portion 742 First output portion 743 First grounding portion 751 Second electromotive unit 752 Second output unit 753 Second grounding unit

Claims (7)

A transformer for transformation comprising a primary coil, a secondary coil and a core;
A heat sink having a mounting surface on which the transformation transformer is mounted;
Have
The core has a columnar core portion extending up and down,
The primary coil has a coil portion surrounding the columnar core portion,
The secondary coil has a first flat coil component and a second flat coil component, and
The heat sink is
A mounting unit whose upper surface is the mounting surface,
A contact portion that is formed integrally with the mounting portion and protrudes upward from the mounting surface;
A radiation fin thermally connected to the mounting portion;
Have
The first flat coil component is
A flat plate-shaped first electromotive portion surrounding the columnar core portion in an arc shape and expanding substantially in parallel to the mounting surface;
A plate-like first output section extending from one end of the first electromotive section;
A plate-shaped first grounding portion extending from the other end of the first electromotive portion;
Have
The second flat coil component is
A flat plate-like second electromotive portion surrounding the columnar core portion in an arc shape and expanding substantially in parallel to the mounting surface;
A plate-shaped second output portion extending from one end of the second electromotive portion;
A plate-like second grounding portion extending from the other end of the second electromotive portion;
Have
The contact portion is
A first contact surface that extends substantially parallel to the placement surface and contacts the first grounding portion;
A second contact surface that extends substantially parallel to the placement surface and contacts the second grounding portion;
I have a,
The first ground portion is in the form of a flat plate that extends substantially in parallel to the mounting surface on the same plane as the first electromotive portion.
The power conversion device according to claim 1, wherein the second ground portion is a flat plate extending substantially in parallel to the mounting surface on the same plane as the second electromotive portion . The power converter according to claim 1, wherein
The end portion of the first grounding portion and the end portion of the second grounding portion have different vertical positions,
The said 1st contact surface and the said 2nd contact surface comprise the level | step-difference part from which the position of the up-down direction differs. The power converter according to claim 1 or 2, wherein
The first output portion is in the form of a flat plate that extends substantially parallel to the mounting surface on the same plane as the first electromotive portion.
The power conversion device according to claim 1, wherein the second output portion is a flat plate that extends substantially in parallel to the mounting surface on the same plane as the second electromotive portion. The power conversion device according to any one of claims 1 to 3,
  The power converter according to claim 1, wherein each of the first flat coil component and the second flat coil component has a flat plate shape extending substantially in parallel to the mounting surface. The power conversion device according to any one of claims 1 to 4,
The first flat coil component and the second flat coil component are disposed to overlap in the vertical direction,
An electric power converter, wherein an insulation part is arranged between the first flat coil part and the second flat coil part. A power conversion device according to any one of claims 1 to 5,
The power converter according to claim 1, wherein the first flat coil component and the second flat coil component have the same shape. The power conversion device according to any one of claims 1 to 6,
The power converter according to claim 1, wherein the first ground unit and the second ground unit are disposed between the first output unit and the second output unit.

Images