JP2007228757A - Electrical connection box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve compaction or to sustain suitable durability by arranging a semiconductor relay and its control section rationally. <P>SOLUTION: In the electrical connection box 1, the substrate is formed of a wiring board 2 where substrate connectors 7, 7 are arranged oppositely along a pair of parallel end edges and a semiconductor relay 3 is arranged between the substrate connectors 7, 7, and an ECU substrate 4 where a control section 5 is arranged on the upper surface and a terminal portion 12 connected electrically with the wiring board 2, is provided on the lower surface along a pair of parallel end edges. The ECU substrate 4 is attached onto the wiring board 2 between the substrate connectors 7, 7 in such a direction as the terminal portions 12, 12 intersect the substrate connectors 7, 7 perpendicularly. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrical junction box mounted on an automobile.

  The electric junction box for automobiles connects / disconnects between the power source of the on-vehicle battery and the electronic control unit for engines and auxiliary devices such as headlights, etc., which become electric loads, and each electronic control unit (hereinafter referred to as “ECU”). This is a well-known device for controlling the power supply to the abbreviation. For example, in Patent Document 1, a circuit unit in which a desired circuit is formed in a cover by a wiring plate in which wires are arranged and a wiring board in which a bus bar is arranged is connected to the circuit unit. An electrical junction box comprising a relay module and a control board on which a control unit for controlling the semiconductor relay module is mounted is disclosed.

JP 2003-18725 A

  In this electrical junction box, since the semiconductor relay and its control unit are arranged on the same board, the planar shape of the control board becomes large, and the overall compactness is hindered. In addition, electronic components such as a microcomputer constituting the control unit are easily affected by heat generated by the semiconductor relay, leading to a decrease in durability.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electrical junction box in which a semiconductor relay and its control unit are rationally arranged to achieve compactness and suitable durability.

In order to achieve the above object, an invention according to claim 1 is an electrical junction box in which a semiconductor relay, a control unit for controlling the semiconductor relay, and a board connector connected to the wire harness are mounted on the board. The board is arranged so as to be opposed along a pair of parallel edges of the plurality of board connectors, and the semiconductor relay is arranged between the board connectors, and the control unit is arranged on the upper surface or the lower surface. A terminal portion electrically connected to the first substrate is provided on the lower surface along a pair of parallel edges, and is formed with a second substrate smaller than the first substrate; The board is assembled on the first board between the board connectors facing each other so that the terminal portions are perpendicular to the board connector.
In order to achieve the rationalization of the manufacturing process in addition to the object of the first aspect, the invention according to the second aspect includes a semiconductor relay and a board connector on the first board, and a terminal portion of the second board. Each is configured to be surface-mounted on the first substrate.

According to the first aspect of the present invention, the semiconductor relay and its control unit can be rationally arranged by dividing it into two upper and lower substrates, and the overall size can be reduced. In particular, by setting the orientation of the second board, even if there are mounted components on the first board, the hot air is distributed evenly during reflow, so that the assembly reliability can be ensured even if the boards are stacked.
In addition, since the control unit of the second board is not affected by the heat generated by the semiconductor relay, the thermal load is reduced and the durability can be expected to be maintained. In addition, the first board having a large heat generation amount is used as the metal core board. On the other hand, it is possible to rationally select the second substrate with an inexpensive glass-epoxy substrate for cost reduction while achieving heat.
According to the second aspect of the present invention, in addition to the effect of the first aspect, each mounting component on the first board can be electrically connected at a time by reflow, and the manufacturing process can be rationalized.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a hexahedral view showing an example of the electrical junction box of the present invention, FIG. 2 is a perspective view, and FIG. 3 is an exploded perspective view of a substrate. The electrical junction box 1 is a well-known device that controls the power supply to each ECU and auxiliary device by conducting / interrupting between the power source of the on-vehicle battery and each ECU and auxiliary device serving as an electric load. Here, the control unit 5 is configured by electronic parts such as a control microcomputer on a planar rectangular wiring board 2 as a first board on which the semiconductor relays 3, 3... Are mounted to form a predetermined circuit. The ECU board 4 as the second board is assembled. A bus bar 6 to which power is supplied from the outside is assembled on the lower surface of the wiring board 2, and board connectors 7, 7... To which a connector of a wire harness for connecting an external ECU is connected are assembled on the upper and lower surfaces. Yes. These components are entirely covered by an upper and lower cover (not shown) except for a wire harness, a fuse connecting portion, and the like.

  The board connector 7 is made of a synthetic resin horizontally long box-shaped connector housing 8 in which an insertion hole into which the connector of the wire harness is inserted and connected is opened on the edge side of the wiring board 2, and is provided on the closing side of the connector housing 8. And a plurality of terminals 9, 9... Electrically connected to the circuit of the wiring board 2. Here, along the pair of parallel edges of the wiring board 2 on the upper and lower surfaces of the wiring board 2. Each is assembled in an opposing manner. On the other hand, the bus bar 6 is integrally formed with a plurality of fuse terminals 10, 10... At the edge in the longitudinal direction, and together with the fuse terminals 11 paired therewith, is orthogonal to the board connector 7 on the lower surface side of the wiring board 2. It is assembled along one edge.

The ECU board 4 has a rectangular shape that is slightly smaller than the wiring board 2, and the lower surface is provided with terminal portions 12 and 12 along a pair of edges parallel to each other. A plurality of L-shaped terminals 13, 13... Projecting downward are electrically connected to circuits on the wiring board 2. Here, the ECU board 4 is arranged between the board connectors 7 and 7 so that the terminal portions 12 are orthogonal to the board connector 7.
Here, the wiring board 2 is a metal core board, and the ECU board 4 is a glass epoxy board. Further, the semiconductor relay 3 and the board connector 7 on the wiring board 2 and the terminal portion 12 of the ECU board 4 are each surface-mounted to be soldered to the wiring board 2 by reflow. Therefore, a predetermined gap is secured between the connector housing 8 of the board connector 7 and the terminal portion 12 of the ECU board 4 so that hot air can pass during reflow.

  In the electrical junction box 1 configured as described above, the electricity supplied to the bus bar 6 flows to the ECU board 4 via the circuit on the wiring board 2. The ECU board 4 controls the current value of each semiconductor relay 3 to perform switching operation of each semiconductor relay 3 to control power supply to each external ECU via a fuse assembled to the bus bar 6. . At this time, since the ECU board 4 is separate from the wiring board 2 on which the semiconductor relay 3 is mounted, even if the semiconductor relay 3 generates heat during operation, the control unit 5 on the ECU board 4 is affected. There is no.

Thus, according to the electrical junction box 1 of the said form, a board | substrate is arrange | positioned in opposition along a pair of edge where the board connectors 7 and 7 are parallel, and the semiconductor relay 3 is between board | substrate connectors 7 and 7. The wiring board 2 disposed on the upper surface, the control unit 5 is disposed on the upper surface, and the terminal portions 12 and 12 electrically connected to the wiring substrate 2 are provided on the lower surface along a pair of parallel edges, The ECU board 4 is formed on the wiring board 2 between the opposing board connectors 7 and 7 so that the terminal portions 12 and 12 are orthogonal to the board connectors 7 and 7. By assembling, the semiconductor relay 3 and its control unit 5 can be rationally arranged by dividing them into two upper and lower substrates, and the whole can be made compact. In particular, depending on the orientation of the ECU board 4, the hot air is evenly distributed to each mounted component during reflow, so that the reliability of assembly can be ensured even if the boards are stacked.
In addition, since the control unit 5 of the ECU board 4 is not affected by the heat generated by the semiconductor relay 3, it is possible to reduce the thermal load and maintain durability. In addition, the wiring board 2 that generates a large amount of heat is used as the metal core board. On the other hand, it is possible to make a rational selection by reducing the cost by forming the ECU board 4 with an inexpensive glass epoxy board while achieving heat.

  In particular, here, the semiconductor relay 3 and the board connector 7 on the wiring board 2 and the terminal portion 12 of the ECU board 4 are surface-mounted on the wiring board 2, so that each mounted component on the wiring board 2 is reflowed. Can be electrically connected at a time, thereby streamlining the manufacturing process.

In addition, the board | substrate connector arrange | positioned at the edge of a wiring board is not restricted to what is arrange | positioned one by one like the said form, A plurality may be arranged in parallel at an edge.
Further, all the components on the first substrate are not necessarily mounted components, and some of them may be assembled in other connection forms such as through-hole connection.
Further, the first and second substrates are not limited to a flat rectangular shape as in the above-described form, and are flat L-shaped as long as they have a pair of parallel edges to which the board connector and the terminal portion are assembled in an opposing manner. It is possible to adopt other planar shapes such as a shape. The control unit can also be provided on the lower surface of the second substrate.
In addition, the terminal shape of the board connector, the terminal shape of the terminal portion of the second board, and the like may be appropriately changed in design.
Moreover, in each location surface-mounted (reflowed) by this embodiment, for example, the terminal part 12 grade | etc., It can replace with the L-shaped terminal 13 and can also use a press fit terminal.

It is a 6-face drawing which shows an example of an electrical junction box. It is a perspective view of an electrical junction box. It is a disassembled perspective view of an electrical junction box.

Explanation of symbols

1 .... Electric junction box, 2 .... Wiring board, 3 .... Semiconductor relay, 4 .... ECU board, 5 .... Control part, 7 .... Board connector, 12 .... Terminal part.

Claims (2)

A semiconductor relay, a control unit for controlling the semiconductor relay, and a board connector to be connected to the wire harness, is an electrical connection box mounted on the board,
A plurality of the substrate connectors arranged in a facing manner along a pair of parallel edges, and the semiconductor relay is disposed between the substrate connectors;
The control unit is disposed on an upper surface or a lower surface, and terminal portions that are electrically connected to the first substrate are provided on the lower surface along a pair of parallel edges, and are smaller than the first substrate. With two substrates,
An electrical junction box, wherein the second board is assembled on the first board between the board connectors facing each other, with the terminal portion being orthogonal to the board connector. The electrical junction box according to claim 1, wherein the semiconductor relay and the board connector on the first board and the terminal portion of the second board are surface-mounted on the first board, respectively.

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