JP-2026075774-A - Inverter

Abstract

[Problem] To provide an inverter that can reduce the number of components. [Solution] The inverter according to this embodiment comprises a substrate, a heat sink, a bus bar, and a fastening member. A heating element is mounted on the first main surface of the substrate. The heat sink is provided on the first main surface side, at a position facing the heating element. The bus bar is provided on the second main surface, which is the back side of the first main surface of the substrate. The fastening member fastens the substrate, heat sink, and bus bar together. [Selection Diagram] Figure 1A

Inventors

• 中村 全寿

Assignees

• 株式会社デンソーテン

Dates

Publication Date

20260511

Application Date

20241023

Claims (6)

1. A substrate with a heating element mounted on the first main surface, On the first main surface side, a heat sink is provided at a position facing the heating element, A busbar is provided on the second main surface, which is the back side of the first main surface of the substrate, An inverter comprising a fastening member for fastening the substrate, the heat sink, and the busbar together.
2. The aforementioned heating element is It is a switching element, The aforementioned busbar is The inverter according to claim 1, wherein the inverter is positioned to overlap the switching element in a view in the stacking direction and is electrically connected to the switching element via a conductive pattern provided on the substrate.
3. A control board is provided at a position opposite to the busbar so as to sandwich the busbar between the busbar and the substrate, Furthermore, The fastening member is The inverter according to claim 1, wherein the substrate, the heat sink, the busbar, and the control board are fastened together as a single unit.
4. The aforementioned busbar is The inverter according to claim 1, wherein the shape of the substrate side is convex when viewed from the side.
5. The aforementioned heatsink is The heating element has a main body located in the stacking direction and a side wall located to the side of the heating element, The fastening member is The inverter according to claim 1, which is inserted into the side wall portion and fastened.
6. The inverter according to claim 1, wherein the fastening member is a screw, and the head of the screw is located on the busbar side relative to the substrate.

Description

This invention relates to an inverter. In recent years, the demand for inverters has increased with the proliferation of electric vehicles such as electric motorcycles and electric cars. In this type of inverter, a structure has been proposed in which a heat dissipation surface is placed on the surface of the heat-generating element (the side opposite to the mounting surface on the substrate), and heat is dissipated by direct contact between the heat dissipation surface and the heat sink without the substrate (see, for example, Patent Document 1). Japanese Patent Publication No. 2020-120084 Figure 1A is a top view of the inverter according to the embodiment.Figure 1B is an exploded perspective view of the inverter according to this embodiment.Figure 2 is a cross-sectional view of an inverter according to this embodiment.Figure 3 is a cross-sectional view of an inverter according to this embodiment. The inverter according to the embodiment will be described in detail below with reference to the attached drawings. However, this invention is not limited to the embodiments shown below. Figure 1A is a top view of the inverter 1 according to the embodiment. Figure 1B is an exploded perspective view of the inverter 1 according to the embodiment. Figures 2 and 3 are cross-sectional views of the inverter 1 according to the embodiment. Figure 2 shows a cross-section taken along line A-A in Figure 1A, and Figure 3 shows a cross-section taken along line B-B in Figure 1A. Note that Figure 1A shows only a part of the internal structure of the inverter 1, and some components such as the casing, control board, and capacitors are omitted from the illustration. As shown in Figures 1A to 3, the inverter 1 according to this embodiment comprises a power board 2, a busbar 3, a power element 4, a heat sink 8, and an insulating member 12. Furthermore, as shown in Figure 1B, the power board 2, busbar 3, power element 4, capacitor 5, and heat sink 8 are fastened together by fastening members 7b and 7c. The power board 2 is a resin substrate on which electronic components related to current conversion are mounted. Specifically, the power elements 4 are mounted on the first main surface 2a (see Figure 2) of the power board 2. Furthermore, the busbars 3 are provided on the second main surface 2b, which is the back side of the first main surface 2a. Furthermore, the power board 2 has conductive patterns 6 formed on it that electrically connect the power elements 4 and the busbar 3. The conductive patterns 6 are made of a metal material, such as copper. Multiple conductive patterns 6 are arranged along the longitudinal direction of the power board 2, and each is insulated by leaving a predetermined gap between them. Specifically, in Figure 1A, seven conductive patterns 6P1, 6W, 6N1, 6V, 6P2, 6U, and 6N2 are arranged in an insulated state, and are electrically connected to the busbar 3 into which input or output electrodes (not shown) are inserted. Conductive pattern 6P1 has busbars 3, into which the positive input electrode is inserted, positioned in contact with the pattern surface. Conductive pattern 6P2 is a conductive pattern without busbars 3 positioned on its pattern surface, and is electrically connected to conductive pattern 6P1 by wiring (not shown). Conductive pattern 6N1 has busbars 3, into which the negative input electrode is inserted, positioned in contact with the pattern surface. Conductive pattern 6N2 has busbars 3, into which electrodes are not inserted, positioned in contact with the pattern surface. Further details will be described later, but each busbar 3 also functions as a component for pressing the power element 4 against the heat sink 8. Furthermore, the busbars 3 positioned in conductive pattern 6N2 do not function as components responsible for electrical connections, but rather as components for pressing the power element 4 against the power substrate 2 and the heat sink 8. Therefore, since the busbars 3 positioned in conductive pattern 6N2 do not need to function as conductors, their size (thickness and length) may be smaller than that of busbars 3 into which electrodes are inserted. Furthermore, although this disclosure shows an example where the busbar 3 is not arranged on the conductive pattern 6P2, if more force is needed to hold down the power element 4, additional busbars of the same shape as the busbar 3 provided on the conductive pattern 6N2 may be arranged. In conductive pattern 6W, a busbar 3, into which the output electrode corresponding to the W phase of the three-phase AC is inserted in a through-hole 31W, is positioned in contact with the pattern surface. In conductive pattern 6V, a busbar 3, into which the output electrode corresponding to the V phase of the three-phase AC is inserted in a through-hole 31V, is positioned in contact with the pattern surface. In conductive pattern 6U, a busbar 3, into which the output electrode corresponding to the U phase of the three-phase AC is inserted in a t