JP2006033994A - Electric connection box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric connection box for enhancing the degree of freedom in the arranging position of a substrate in the electric connection box. <P>SOLUTION: In the electric connection box where a circuit component 10 is contained in a casing 20 consisting of an upper case 20A and a lower case 20B, the circuit component 10 comprises a power circuit section 18 constituting a power circuit by arranging bus bars 11, and a control circuit board 40 located at a position spaced apart from the power circuit section 18 and provided with a control element 41 for constituting a control circuit wherein the power circuit and the control circuit are connected electrically through a flexible flat type conductor 50. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrical junction box.

  2. Description of the Related Art Conventionally, for example, an electrical junction box for distributing current from a battery or the like to various parts in a vehicle is known.

In this type of electrical junction box, a circuit is formed on a board on which elements are mounted, and the circuit on this board and the bus bar are electrically connected to form a power circuit. Some control circuits for controlling the current of the power circuit and the like are configured on a substrate.
JP 2002-330524 A

By the way, if the power circuit and the control circuit are arranged on the same substrate as described above,
It is necessary to secure a space corresponding to that in the electrical junction box, and the location of the board in the electrical junction box is limited, and the influence of heat generated in the power circuit tends to affect the control circuit.
The present invention has been completed based on the above-described circumstances, and is an electrical connection that improves the degree of freedom of the location of the board while preventing the influence of heat generated in the power circuit from reaching the control circuit. The purpose is to provide a box.

  As a means for achieving the above object, the invention of claim 1 is an electric junction box in which a circuit component is housed in a casing, and the circuit component is a power circuit in which a bus bar is routed. And a control circuit board that is arranged at a position spaced apart from the power circuit unit and that includes a control element and forms a control circuit.

  The invention of claim 2 is characterized in that, in the apparatus of claim 1, the power circuit and the control circuit are electrically connected by a flexible flat conductor.

<Invention of Claim 1>
According to this configuration, since the control circuit board is arranged at a position separated from the power circuit unit, the power circuit and the control circuit can be separated, and the influence of the heat generated in the power circuit unit is controlled on the control circuit. And the degree of freedom of installation of the control circuit board in the casing can be improved.

<Invention of Claim 2>
According to this configuration, since the power circuit and the control circuit are electrically connected by the flexible flat conductor, the degree of freedom in the arrangement of the control circuit board in the casing is achieved while ensuring the electrical connection stability. Can be improved.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the electrical junction box of the present embodiment has a circuit structure 10 housed in a casing 20 and is mounted on a vehicle (not shown), and current from a vehicle power source (battery or the like) is supplied to the vehicle. It is for distributing to each device.

  As shown in FIG. 2, the circuit structure 10 is arranged at a position away from the power circuit unit 18, which forms a power circuit by passing a current supplied from a power source (battery or the like). It is comprised from the control circuit board 40 which comprises a control circuit, and the flexible flat conductor 50 which electrically connects the said control circuit and a power circuit.

  The power circuit unit 18 includes a rectangular wiring board 25 in which the bus bars 11 are stacked via the insulating plate 12 and a lid 30A that covers the wiring board 25 from above.

  The wiring board 25 is formed by laminating a plurality of bus bar groups 11A, 11B, and 11C, each made of metal and formed in a flat plate shape, into three layers via two insulating plates 12A and 12B. Each of the bus bar groups 11A, 11B, and 11C constitutes a conductive path, and a terminal portion 13 is formed upright for each conductive path at a terminal portion of each conductive path.

  Further, at one end (the left end in FIG. 2) of the wiring board 25, control circuit side terminal portions 16A, 16B, and 16C extending from the bus bar groups 11A, 11B, and 11C for each group are formed to protrude sideways. The control circuit side terminal portions 16A, 16B and 16C are connected to one end side of a flexible flat conductor 50 which will be described later. The control circuit side terminal portions 16A, 16B, and 16C are set to be bent so that the height of the upper surface thereof is horizontal, and the flexible flat conductor 50 is connected to the horizontal upper surface. It has become.

  The lid portion 30A is engaged with the receiving portion 30B inside the lower case 20B described later in a state where the wiring board 25 is accommodated, whereby the claw portion 31A of the lid portion 30A and the engaging portion 31B of the accommodating portion 30B are engaged. The fitting state is maintained.

  As shown in FIG. 2, a plurality of relay insertion ports 32 that open in a hood shape are provided on the upper surface of the lid 30A, and a plurality of fuse insertion ports 33 that also open in a hood shape are provided. When the lid portion 30 </ b> A is fitted, the terminal portion 13 protrudes inside the hood of the relay insertion port 32 and the fuse insertion port 33. In addition, electronic components such as an external relay 34 and a fuse 35 are attached to the insertion ports 32 and 33.

  The control circuit board 40 has a printed wiring on a rectangular board, and a control circuit 41 (for example, a microcomputer, a relay, etc.) is mounted on one surface (the upper surface in FIG. 2) to form a control circuit. Yes.

  As shown in FIG. 3, three electrical connection portions 42, 42, 42 respectively connected to the above-described printed wirings are provided side by side in a substantially central portion on one long side portion of the control circuit board 40. A flexible flat conductor 50, which will be described later, is connected here.

  As shown in FIG. 3, the flexible flat conductor 50 has three conductive portions 51 on one surface (upper surface in FIG. 3) of a thin and substantially rectangular insulating member (for example, a synthetic resin such as plastic or rubber). , 51, 51 are arranged side by side, and the interval between the conductive portions 51, 51, 51 is narrowed toward the control circuit board 40. Then, one end side of the conductive portions 51, 51, 51 is soldered (electrically connected) to the control circuit side terminal portions 16 A, 16 B, 16 C of the bus bar 11, and the other end side is electrically connected to the control circuit board 40. The parts 42, 42, 42 are respectively soldered (electrically connected).

  The casing 20 is composed of a lower case 20B and an upper case 20A fitted therein.

  The lower case 20 </ b> B includes a bottom plate 21 having a rectangular shape and a side wall 22 rising from the peripheral edge of the bottom plate 21.

  On the upper surface of the bottom plate 21, a support wall 23 erected on one end side in the longitudinal direction (left end side in FIG. 1) and a housing portion 30 </ b> B that occupies substantially the entire central portion of the upper surface of the bottom plate 21 are formed. ing.

  The support wall 23 has a thick and rectangular flat plate shape, and a pair of screw holes 23A are formed at both ends (the front and rear ends in FIG. 2).

  In the accommodating portion 30B, a partition wall 39 is erected, and an engaging portion 31B is formed on the upper edge portion of the partition wall 39 at a position corresponding to the claw portion 31A of the lid portion 30A.

  The upper edge of the side wall 22 is provided with a plurality of locking portions 24B. When the cases 20A and 20B are fitted, the locking portions 24B and the claw pieces 24A provided on the surrounding wall 26 of the upper case 20A The engagement state of both cases 20A and 20B is maintained by engaging.

  The circuit structure 10 is fixed on the bottom plate 21 of the lower case 20B, and the back surface (the surface on which the control element is not mounted) of the control circuit board 40 is placed on one surface of the support wall 23 while bending the flexible flat conductor 50. The control circuit board 40 is fixed to the support wall 23 by screwing it into the screw hole 23A of the support wall 23 in accordance with (the right side surface in FIG. 1).

  The upper case 20A has a rectangular shape, and a peripheral wall 26 is formed with a peripheral edge protruding downward. On the outer surface of the surrounding wall 26, a claw piece 24A protruding downward is provided at a position corresponding to the engaging portion 31B of the lower case 20B.

According to the present embodiment, since the control circuit board 40 is arranged at a position separated from the power circuit unit 18, the power circuit and the control circuit can be separated, and the influence of heat generated in the power circuit unit 18 is affected. It is difficult to exert on the control circuit. In this embodiment, the control circuit board 40 is arranged in the casing 20 in a vertical orientation. This is a measure for reducing the horizontal installation area as compared with the case where the control circuit board 40 is horizontally arranged in the horizontal orientation. That is, this embodiment means that there is a degree of design freedom that can take the above-mentioned posture when there is a request for installation in a narrow space such as an engine room of a vehicle.
Furthermore, since the power circuit and the control circuit are electrically connected by the flexible flat conductor 50, the degree of freedom of arrangement of the control circuit board 40 in the casing 20 is improved while ensuring the electrical connection stability. Can be made.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIGS.
In the above embodiment, the flexible flat conductor 50 is used to electrically connect the control board side terminal portions 16A, 16B, 16C of the bus bar 11 and the electrical connection portions 42, 42, 42 of the control circuit. On the other hand, in this embodiment, the control board side terminal portions 16A, 16B, and 16C and the corresponding electrical connection portions 42, 42, and 42 are connected by the conductive members 60, 60, and 60, respectively.

  The conductive member 60 is formed by covering the periphery of a metal wire with an insulating member. The coating is stripped off at both ends, and each control board side terminal portion 16A is exposed at both ends where the metal wire is exposed. , 16B, 16C and the respective electrical connection portions 42, 42, 42 are soldered to achieve electrical connection. In addition, about the structure same as other Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

(1) The flexible flat conductor is not limited to the above-described form, and may have another form. For example, a flat cable or the like may be used. Further, although the electrical connection is performed by soldering, a configuration may be adopted in which electrical connection is achieved by pressure contact using a pressure contact terminal or the like, or by screwing.
(2) In the above-described embodiment, the power circuit unit 18 includes the wiring board 25 and the lid portion 30A that covers the wiring board 25. However, the power circuit unit 18 may be configured only by the wiring board 25. .
(3) In the above embodiment, the support wall 23 that supports the control circuit board 40 is provided in the lower case 20B, but the support wall 23 may not be provided. For example, the control circuit board 40 may be directly fixed to the side wall 22 (enclosure 26) of the lower case 20B (upper case 20A). In this way, the horizontal installation area of the electrical junction box can be further reduced.

Sectional conceptual diagram of the electrical junction box showing the configuration of the first embodiment Disassembled perspective view of electrical junction box The perspective view which shows the connection state of a flexible flat conductor Cross section The perspective view which shows the connection state of an electroconductive member Cross section

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Circuit structure 11A, 11B, 11C ... Bus-bar group 12A, 12B ... Insulation board 16A, 16B, 16C ... Control circuit side terminal part 18 ... Power circuit part 20 ... Casing 20A ... Upper case 20B ... Lower case 23 ... Support wall 25 ... Wiring board 30A ... Lid 40 ... Control circuit board 50 ... Flexible flat conductor 60 ... Conductive member

Claims (2)

An electrical junction box in which a circuit component is housed in a casing,
The circuit structure is
A power circuit section in which a bus bar is wired to form a power circuit;
An electrical junction box, comprising: a control circuit board that is arranged at a position spaced apart from the power circuit unit and includes a control element and that constitutes a control circuit. The electrical connection box according to claim 1, wherein the power circuit and the control circuit are electrically connected by a flexible flat conductor.

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