JP2003324823A - Onboard power distributor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a compact size by reducing not only the thickness but also the area itself. <P>SOLUTION: The onboard power distributor has inside a box 10 an input side busbar 11, a plurality of output side busbars 12 connected to each electronic unit, a plurality of FETs 13 provided in between the input side busbar 11 and each output side busbar 12, and a printed circuit board 14 for drive control. The output side busbars 12 have upstream side busbar sections 12a, arranged to be approximately flush with the input side busbar 11, and downstream side busbar sections 12b separated in the thickness direction of the box 10 and are arranged approximately in parallel. An overcurrent-blocking fuse member 16 is interposed between the two busbar sections. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted power source distributor for distributing power to a plurality of electronic units from a common power source mounted on a vehicle.

[0002]

2. Description of the Related Art Conventionally, as a means for distributing electric power from a common vehicle-mounted power source to each electronic unit, a power distribution circuit is constructed by stacking a plurality of bus bar boards, and a vehicle equipped with fuses and relay switches has been incorporated therein. Power distributors are generally known.

Further, in recent years, in order to realize the miniaturization and high-speed switching control of such a vehicle-mounted power distributor, a semiconductor switching element such as FET (Field Effect Transistor) is provided between the input terminal and the output terminal in place of the relay. Has been developed.

For example, in the technique disclosed in Japanese Unexamined Patent Publication No. 2001-268785, the input terminal and the output terminal connected to the semiconductor switching element are made of metal plates, and
By arranging the input terminal and the output terminal on the same plane orthogonal to the plate thickness direction of the metal plate, the thickness of the vehicle-mounted power supply distributor is reduced.

[0005]

In the technique disclosed in the above publication, the thickness dimension of the box is reduced, but the area in the direction perpendicular to the thickness direction is not reduced. On the other hand, in the case of an on-vehicle power supply distributor, it is unavoidable to arrange it in a narrow space. Therefore, it is required to reduce not only the thickness of the box but also its area itself to make it more compact. Has been done.

Further, since the electronic unit connection side of the output terminal and the power supply connection side of the input terminal are opposite sides of the box body, it is not possible to put those connector parts together on the outer wall of the box body.
It becomes difficult to connect the connector, which may reduce workability during assembly work to the vehicle.

Further, a plurality of fuses, which are blown by an overcurrent, are provided at the output terminals in the box body, and the presence of these fuses hinders the above compactness and
There is also a problem with its maintenance.

In view of such circumstances, it is an object of the present invention to provide a vehicle-mounted power source distributor which can reduce not only the thickness dimension but also the area itself to achieve further compactness. To do.

[0009]

The present invention is a vehicle-mounted power distributor for distributing power from a common power source mounted on a vehicle to a plurality of electronic units, and an input side bus bar connected to the power source. A plurality of output side bus bars connected to each electronic unit, a plurality of semiconductor switching elements interposed between the input side bus bar and each output side bus bar, and a control circuit board for controlling the driving of the semiconductor switching elements. The output-side bus bar is disposed in the box body, and the output-side bus bar is separated from the upstream-side bus bar portion in the thickness direction of the box body with respect to the upstream-side bus bar portion arranged side by side on the substantially same plane as the input-side bus bar. The present invention is characterized in that it has a downstream side bus bar portion arranged so as to be arranged substantially in parallel, and a fuse member for preventing overcurrent is interposed between both bus bar portions.

In this structure, the input side bus bar connected to the power source, the plurality of output side bus bars connected to each electronic unit, and the plurality of semiconductors provided between the input side bus bar and each output side bus bar. A switching element and a control circuit board for controlling the drive of the semiconductor switching element are arranged in the box body, and an upstream busbar portion arranged side by side on the substantially same plane as the input side busbar and the upstream busbar portion. With respect to the output side bus bar, which has a downstream side bus bar portion arranged so as to be spaced apart in the thickness direction of the box body and arranged substantially parallel to each other, a fuse member for preventing an overcurrent is interposed between both bus bar portions. Therefore, the portion corresponding to the upstream bus bar portion of the output side bus bar and the portion corresponding to the downstream side bus bar portion of the output side bus bar are arranged on the same plane. The area of the box is smaller than the coming structure. In this way, not only the thickness dimension of the box body but also the area itself is reduced, so that it is possible to achieve a great compactness. Therefore, it is suitable for a vehicle-mounted power source distributor inevitably arranged in a narrow space. Will be things. Furthermore, in this case, the electronic unit connection side of the output side bus bar and the power supply connection side of the input side bus bar are on the same side of the box, and since those connector parts can be put together on the outer wall of the box, connector connection becomes easy. As a result, workability at the time of assembling work to the vehicle is improved.

In the on-vehicle power source distributor according to claim 1, an end portion of the upstream side bus bar portion of the output side bus bar and an end portion of the downstream side bus bar portion of the output side bus bar project in substantially the same direction, If the fuse member is detachably attached across these end portions (claim 2), the fuse member can be collectively arranged in a replaceable position on the outer wall of the box body. The area of the box body is further reduced and the maintainability is improved as compared with the case where the box body is arranged.

In the on-vehicle power supply distributor according to claim 1 or 2, the control circuit board is a sheet, and the input side bus bar and the upstream side bus bar portion of the output side bus bar are insulated from the control circuit board. Since the control circuit board is directly supported by each bus bar, the thickness of the box body is larger than that when the bus bar and the control circuit board are separated from each other. The dimensions are further reduced. At this time, the control circuit is insulated from the input-side bus bar and the upstream-side bus bar portion of the output-side bus bar by, for example, an insulating adhesive, so that there is no risk of short circuit.

In the on-vehicle power source distributor according to any one of claims 1 to 3, the box is divided into two layers in the thickness direction,
The upstream bus bar portion of the input side bus bar and the output side bus bar and the downstream side bus bar portion of the output side bus bar are integrally moved in the direction perpendicular to the thickness direction so as to be housed in each compartment. If this is the case (claim 6), the bus bars can be integrated and easily housed in the compartments of the box, so that the work efficiency in the assembling work is improved.

In the vehicle-mounted power source distributor according to any one of claims 1 to 3, the box body is divided into two layers in the thickness direction,
If the upstream bus bar portion of the input side bus bar and the output side bus bar and the downstream side bus bar portion of the output side bus bar are stacked in order in the thickness direction, it is configured to be housed in each section respectively. (Claim 7), a reinforcing member or the like for integrating the bus bars is not required, and the structure is simplified.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIG. 1 is a diagram showing an external configuration of a vehicle-mounted power source distributor according to Embodiment 1 of the present invention, in which (a) is a perspective view and (b) is ( X in a)
It is a X-ray sectional view. It is assumed that the upper left in FIG. 1A is the front of the vehicle-mounted power distributor, the lower right is the rear, the lower left is the left, and the upper right is the right.

The on-vehicle power source distributor according to the first embodiment is
As shown in FIGS. 1A and 1B, a rectangular parallelepiped box body 1 including a main body cover 1, a side cover 2, and a heat dissipation plate 3.
It has 0.

The body cover 1 is made of an insulating material such as synthetic resin, and has upper and lower surfaces 1a and 1b and a rear surface 1.
c and left and right sides 1d and 1e, and the inside is divided into upper and lower two layers by a partition plate 1f as a support portion. However, the front is open, and the lower surface 1b is largely cut away except for the vicinity of the rear surface 1c. Further, three slope-shaped engaging portions 1g protruding upward are formed on the left and right sides of the front surface 1a toward the front and in the center thereof. Also, the rear surface 1
Three connector parts 1h through which an input-side bus bar 11 and an output-side bus bar 12 which will be described later can be penetrated in upper and lower two stages are formed on both left and right sides of c and the center thereof. However, in the first embodiment, the input side bus bar 11 penetrates only the lower stage of the left connector portion 1h, and the output side bus bar 12
Penetrates only the upper stage of all connector portions 1h.

The side cover 2 is made of an insulating material such as synthetic resin and has upper and lower surfaces 2a and 2b, a front surface 2c, and left and right both surfaces 2d and 2e, but the rear is open. ing. Then, on the front surface 2c, a fuse member 16 described later is attachable to and detachable from the fuse member 16 at substantially equal intervals, and both end portions of the output side bus bar 12 in front of and behind the fuse member 16 are formed with a connector portion 2h which is vertically pierceable. Has been done.
Further, on the upper surface 2a, at a position corresponding to the engaging portion 1g of the main body cover 1, an engaging hole 2 which can be engaged with the engaging portion 1g.
Three g are formed.

The heat radiating plate 3 is made of a material having excellent heat conductivity such as aluminum, and has a plurality of air-cooling fins 3 extending on the lower surface in the left-right direction at equal intervals in the front-rear direction.
The front end is engageable with the lower surface 2b of the side cover 2 and the rear end is engageable with the lower surface 1b of the main body cover 1.

Inside the box body 10, an input side bus bar 11 connected to a power source (not shown) and an input side bus bar portion 12a arranged side by side on the same plane as the input side bus bar 11 are arranged.
And a downstream busbar portion 12b which is arranged so as to be spaced apart from the upstream busbar portion 12a in the thickness direction of the box body 10 and arranged substantially parallel to each other, and is connected to each electronic unit (not shown). A plurality of output side bus bars 12, a plurality of FETs 13 as semiconductor switching elements provided between the input side bus bar 11 and each output side bus bar 12, and a large number of electronic chip parts are mounted.
A printed circuit board 14 as a sheet-like control circuit board for controlling the drive of the FET 13 by inputting a gate signal to the circuit 3 is provided. This printed circuit board 14
For example, the one having a thickness of about 0.3 to 0.5 mm is used.

A printed circuit board 14 is adhered to a part of the input side bus bar 11 and an upstream side bus bar portion 12a of the output side bus bar 12 with an insulating adhesive, and a FET 13 is attached to the other part of the input side bus bar 11. It is installed (see Figure 2 (a) below).

2A and 2B are views showing the connection state of each terminal of the FET, wherein FIG. 2A is a plan view and FIG. 2B is a sectional view taken along line X'-X 'in FIG. As shown in FIGS. 2A and 2B, the FET 13 includes a semiconductor chip 13x that is a main body.
And a drain terminal 13a and a source terminal 13b as energizing terminals for supplying a current from a power source to each electronic unit, and a gate terminal 13c as a control terminal for receiving a gate signal.
Etc., and is manufactured by molding or the like. Of these terminals of the FET 13, the drain terminal 13a is the input side bus bar 11 and the source terminal 13b is the upstream side bus bar portion 12a of the output side bus bar 12.
In addition, the gate terminals 13c are soldered to the printed circuit board 14 to be electrically connected. Therefore, the gate terminal 13c is set shorter than the source terminal 13b by the thickness of the printed circuit board 14,
The printed board 14 is provided with a notch 14a having an appropriate size around the source terminal 13b.

Further, the FET in the input side bus bar 11
The surface opposite to the mounting surface of 13 is connected to the heat radiating plate 3 through a heat transfer sheet 15 as a sheet-shaped heat transfer member so as to be able to transfer heat. The upstream bus bar portion 1 of the output bus bar 12
2a is an input side bus bar 11 as shown in FIG.
To the side cover 2 as an outer wall of the box opposite to the side cover 2 and connected to one end of an overcurrent preventing fuse member 16 attached to the connector portion 2h of the side cover 2 and parallel to the one end. The downstream bus bar portion 12b connected to the other end of the fuse member 16 is further extended in the direction opposite to the above-mentioned extending direction to form a two-tiered structure. With this two-stage configuration, the electronic unit connection side of the output side bus bar 12 and the power supply connection side of the input side bus bar 11 are on the same side of the box body 10, so both bus bar penetration parts are put together in the connector portion 1h of the main body cover 1. In addition, since the fuse member 16 can be collectively disposed in the connector portion 2h of the side cover 2, workability and maintainability at the time of assembling the on-vehicle power distributor to the vehicle are improved. The fuse member 16 is of a type that is blown by an overcurrent, for example.

Further, between the output side bus bar 12 and the partition plate 1f, a reinforcing insulating plate as a reinforcing member for reinforcing the output side bus bar 12 while ensuring insulation between the output side bus bars 12 ( IP) 17 is installed. The interposition of the reinforcing insulating plate 17 ensures the insulation between the output-side bus bars 12 and ensures the support of the output-side bus bar 12 by the partition plate 1f. In addition, on the reinforcing insulating plate 17, boss portions (not shown) for fixing the input side bus bar 11 and the output side bus bar 12 are formed at appropriate positions.

FIG. 3 is an exploded perspective view of the vehicle-mounted power source distributor according to the first embodiment.
For example, it is manufactured as follows. In addition, it is assumed that a single metal plate is punched by press working to form a bus bar circuit, which becomes a power supply system circuit. This bus bar circuit is equipped with a FET 13 and is branched from an input side bus bar 11 on the upstream side for drain connection to fuse member 16
Upstream side bus bar portion 12 of the output side bus bar 12 toward the
a and a downstream bus bar portion 12b that extends further downstream from the fuse member 16.

First, the input side bus bar 11 formed as described above.
And a part of the output side bus bar 12 and the upstream side bus bar part 1
The printed circuit board 14 is bonded to 2a (denoted by the reference numeral in FIG. 3). By using the printed circuit board 14 which is such an extremely thin wiring board, the output side bus bar 1
The upstream bus bar portion 12a of 2 and the mounting surface of the printed board 14 are brought close to each other so that the terminals of the FET 13 can be connected to each other.

Next, in the other part of the input side bus bar 11, F
The drain terminal 13a of the ET 13 is soldered, and the gate terminal 13b and the source terminal 13c are soldered to the wiring material to which the output side bus bar 12 and the printed board 14 are bonded. Also, a plurality of chip components 18 are mounted on the printed circuit board 14 by soldering (denoted by reference numerals in FIG. 3).

Next, each bridge of the input side bus bar 11 and the output side bus bar 12 (upstream side bus bar portion 12a) upstream of the fuse member 16 is divided by a press or the like and placed on the reinforcing insulating plate 17, and this reinforcing insulation is provided. The input side bus bar 11 and the output side bus bar 1 are formed by crushing the boss portion on the plate 17.
By fixing the two, one wiring member is formed.
Since the lower portion of the FET 13 is connected to the heat dissipation plate 3, the escape portion 17a is previously formed so that the reinforcing insulating plate 17 does not enter.
(See FIG. 2) is preferably provided. The output side bus bar 12 (downstream side bus bar portion 12b) on the downstream side of the fuse member 16 is also punched and formed by a press or the like, and fixed to the reinforcing insulating plate 17 in the same manner as above.
One wiring material is formed.

The two wiring members formed as described above are superposed (denoted by the reference numerals in FIG. 3). Then, the two wiring members that have been overlapped with each other are integrated and housed in respective compartments of the box body 10 whose interior is divided into two parts. At this time,
The wiring material on which the FET 13 is mounted is an insulating heat transfer sheet 15
It is inserted into the side cover 2 in a state of being placed on the heat dissipation plate 3 via (through reference numeral in FIG. 3). It should be noted that if the wiring board and the heat dissipation plate 3 are previously fixed with screws or the like, a more stable heat dissipation effect can be obtained.

Finally, the fuse member 16 is attached to the connector portion 2h of FIG. 1B (denoted by the reference numeral in FIG. 3).

In the vehicle-mounted power source distributor manufactured in this manner, by connecting a power source to the input side bus bar 11 and an electric load to the output side bus bar 12, power is supplied from the power source to an appropriate electric load. Of the power distribution circuit by controlling the operation of the FET 13 provided in the middle of the power distribution circuit by a control circuit formed of chip components mounted on the printed circuit board 14 On / off control of energization is executed.

That is, according to the above, the input side bus bar 1
There is a bus bar circuit configured between 1 and the output side bus bar 12 in which a relatively large current is input via an electric wire (not shown). A relatively large current flowing through this circuit is shown on the way in FIG.
Source terminal 11b of T13 → semiconductor chip 13x → drain terminal 13a → output side bus bar 12 flows in this order, and is output from the bus bar circuit. On the other hand, a gate signal is input to the gate terminal 13c of the FET 13 from the control circuit of the printed board 14, and the gate signal causes the FET 1 to operate.
The amount of electricity supplied between the source terminal 13b and the drain terminal 13a of No. 3 is controlled.

As described above, since a current equal to the current flowing through the bus bar circuit flows through the FET 13, the FET 13 is
Generates heat, but in the first embodiment, the FET 1 is added to the box body 10.
Since the heat dissipation plate 3 for dissipating the heat from 3 is attached, and the surface of the input side bus bar 11 opposite to the mounting surface of the FET 13 is connected to this heat dissipation plate 3 via the heat transfer sheet 15. The heat from the FET 13 passes through the bus bar 11 on the inlet side and the heat transfer sheet 15 and the heat sink 3
The heat is radiated efficiently from.

As described above, the in-vehicle power source distributor according to the first embodiment includes the input side bus bar 11 connected to the power source, the plurality of output side bus bars 12 connected to each electronic unit, and the input side bus bar. 11 and a plurality of FETs 13 provided between each output side bus bar 12 and
And a printed circuit board 14 on which a chip component 18 for controlling the driving of 3 is attached, and
An upstream busbar portion 12a arranged side by side on the substantially same plane as the input side busbar 11, and a downstream arranged so as to be separated from the upstream busbar portion 12a in the thickness direction of the box body 10 and arranged substantially parallel to each other. Both side busbar portions 12a of the output side busbar 12 having the side busbar portion 12b,
Since the fuse member 16 is interposed between the 12b, not only the thickness dimension of the box body 10 but also the area itself is reduced, and the size is drastically reduced. Therefore, the present invention is suitable for a vehicle-mounted power source distributor which is unavoidably arranged in a narrow space. In this case, the electronic unit connection side of the output side bus bar 12 and the power supply connection side of the input side bus bar 11 are on the same side of the box body 10, and the connector portions 1h can be gathered on the outer wall of the box body 10. Connection is facilitated, which improves workability during assembly work on the vehicle.

Further, in the method for manufacturing a vehicle-mounted power source distributor according to the first embodiment, the wiring member having the above two stages is reinforced by the reinforcing insulating plate 17 and is integrally formed along the extending direction. Since they are accommodated in the respective compartments of the box 10 by moving in parallel, they can be accommodated in the respective compartments of the box 10 easily, and the work efficiency in the assembling work is improved.

The vehicle-mounted power source distributor according to the present invention is not limited to the one manufactured by the above method, but may be manufactured by another method. The configuration of the in-vehicle power supply distributor in that case will be described below as a second embodiment.

(Second Embodiment) FIG. 4 shows a second embodiment of the present invention.
It is a figure which shows the external appearance structure of the vehicle-mounted power distribution device concerning this, Comprising: (a) is a perspective view, (b) is a YY sectional view taken on (a). In FIG. 4, the upper left indicates the front of the vehicle-mounted power distributor, the lower right indicates the rear, the lower left indicates the left, and the upper right indicates the right. In the second embodiment, the same points as those in the first embodiment will be omitted as much as possible.

The vehicle-mounted power distributor according to the second embodiment is
As shown in FIG. 4, a rectangular parallelepiped box body 11 including a main body cover 101, side covers 102, and a heat dissipation plate 103.
It has 0.

The body cover 101 is made of an insulating material such as synthetic resin, and has upper and lower surfaces 101a, 101.
b, rear surface 101c, left and right side surfaces 101d and 101e
And a partition plate 101f. However, the front is open, and the upper surface 101a includes the rear surface 101c and the left and right side surfaces 10.
1d and 101e are left, and it is largely cut away and the lower surface 1
01b is largely cut out except for the vicinity of the rear surface 101c. Then, on the left and right sides and the center of the rear surface 101c, there are three connector portions 101h through which an input-side bus bar 111 and an output-side bus bar 112, which will be described later, can penetrate in two upper and lower stages.
Individually formed.

The side cover 102 is made of an insulating material such as a synthetic resin, and has upper and lower surfaces 102a, 10a.
2b, front surface 102c, left and right side surfaces 102d and 192e
It has and but is open to the rear. The fuse member 1 to be described later is provided on the front surface 102a at substantially equal intervals on the left and right.
16 is detachably attached and the fuse member 1
6, the output side bus bars 112a and 112b before and after 6
A pierceable connector portion 102h is formed, and its upper surface 102a extends rearward so as to cover the cutout portion of the upper surface 101a of the main body cover 101.

The heat radiating plate 103 is made of a material having excellent heat conductivity such as aluminum, and has a plurality of air-cooling fins 1 extending laterally on the lower surface thereof and formed at equal intervals in the front-rear direction.
03a, the front end can be engaged with the side cover 102, and the rear end can be engaged with the main body cover 101.

Inside the box body 110, an input side bus bar 111 connected to a power source (not shown) and a plurality of output side bus bars 112 (upstream side bus bar portion 112a, downstream side) connected to each electronic unit (not shown). Busbar portion 112b),
FETs as a plurality of semiconductor switching elements provided between the input bus bar 111 and each output bus bar 112
113 and a large number of electronic chip components are mounted, and a printed circuit board 114 as a sheet-shaped control circuit board for controlling the driving of the FET 113 by inputting a gate signal to the FET 113 is provided. .

A printed circuit board 114 is bonded to a part of the input side bus bar 11 and the upstream side bus bar 112a of the output side bus bar 112, and the FET 113 is mounted on the other part of the input side bus bar 111 (see the following figure). 5 (a)
reference).

FIG. 5 is a diagram showing a connection state of each terminal of the FET, (a) is a plan view, and (b) is a Y'-Y 'sectional view in (a). As shown in FIGS. 5A and 5B, the FET 113 includes a semiconductor chip 113x, a drain terminal 113a, a source terminal 113b, a gate terminal 113c, and the like, and is manufactured by molding or the like. Of each terminal of these FET113,
The drain terminal 113a is provided on the input side bus bar 111, and the source terminal 113b is provided on the output side bus bar 112 as described above.
2a and the gate terminal 113c is the printed circuit board 11
4 are each soldered to be electrically connected. For this reason, the gate terminal 113c is set to be shorter than the source terminal 113b by the thickness of the printed circuit board 114, and the printed circuit board 114 is provided with the source terminal 11c.
A notch 114a having an appropriate size is provided around 3b.

FE in the input side bus bar 111
The surface opposite to the mounting surface of T113 is connected to the heat dissipation plate 3 via a heat transfer sheet 115 as a sheet-shaped heat transfer member so as to be able to transfer heat. The output side bus bar 112 is shown in FIG.
As shown in FIG. 1, the box body 1 on the side opposite to the input side bus bar 111
10 is extended to a side cover 102 as an outer wall of 10 and is attached to a connector portion 102h of the side cover 102 at one end of an overcurrent blocking fuse member 116. The upstream side bus bar portion 112a of the output side bus bar 112 is provided at one end of the fuse member 116.
Of the output side bus bar 12 connected to the other end of the fuse member 116.
2b is further extended in the direction opposite to the above-mentioned extending direction, and is formed in two stages so as to be parallel to the input side bus bar 111 via a predetermined space. In addition, unlike the first embodiment,
The reinforcing insulating plate 17 is not interposed between the output side bus bar 112 and the partition plate 101e.

FIG. 6 is an exploded perspective view of the vehicle-mounted power source distributor according to the second embodiment.
For example, it is manufactured as follows. In addition, it is assumed that a single metal plate is punched by press working to form a bus bar circuit, which becomes a power supply system circuit.

First, the input side bus bar 11 formed as described above.
The printed circuit board 114 is bonded to a part of 1 and the upstream side bus bar portion 112a of the output side bus bar 112 (denoted by the reference numeral in FIG. 6).

Next, an FET is added to the input side bus bar 111.
The drain terminal 113a of 113 is soldered, and the gate terminal 113b and the source terminal 113 are attached to the wiring material in which the output side bus bar 112 and the printed board 114 are attached.
Solder c and c respectively. In addition, the printed circuit board 11
4 is mounted by soldering a plurality of chip components 118.

Then, each bridge of the input side bus bar 111 and the output side bus bar 112 (upstream side bus bar portion 112a) on the upstream side of the fuse member 116 is divided by a press or the like to form one wiring member. The output side bus bar 112 on the downstream side of the fuse member 116 (the downstream side bus bar portion 11
2b) is also punched by a press or the like to form another wiring material.

A box body 11 having a double-partitioned interior
At 0, the two wiring members formed as described above are placed vertically. At this time, the wiring material on which the FET 113 is mounted is inserted into the main body cover 101 while being placed on the heat dissipation plate 103 via the insulating heat transfer sheet 115 (denoted by the reference numeral in FIG. 6). When mounting the bus bar 112 on the downstream side of the fuse member 116 (downstream bus bar portion 112b), the partition plate 102f of the main body cover 101 is provided with a bus bar arranging groove 101i.
It is preferable to dispose the bus bar 112 therein (FIG. 6).
Represented by the sign inside).

Then, the wiring material formed on the main body cover 101 as described above is overlapped with the wiring material formed on the heat dissipation plate 103 (denoted by the reference numeral in FIG. 6). The side cover 102 is attached so as to cover the cutout portion of the main body cover 101 (denoted by the reference numeral in FIG. 6).

Finally, as shown in FIG.
Attached to the connector portion 102h (denoted by the reference numeral in FIG. 6).

In the vehicle-mounted power source distributor manufactured in this manner, by connecting a power source to the input side bus bar 111 and an electric load to the output side bus bar 112,
A power distribution circuit that distributes power from the power supply to an appropriate electric load is constructed, and the operation of the FET 113 provided in the middle of the power distribution circuit is controlled by a control circuit incorporated in the printed circuit board 114. On / off control of energization of the power distribution circuit is executed.

At this time, since a current equivalent to the current flowing through the bus bar circuit flows through the FET 113, the FET 11
3 generates heat, but in the second embodiment also, the FE is attached to the box body 110.
A heat dissipation plate 103 for dissipating heat from T113 is attached, and the FET 11 in the input side bus bar 111
Since the surface opposite to the mounting surface of No. 3 is connected to this heat dissipation plate 103 via the heat transfer sheet 115, FE
The heat from T113 is efficiently radiated from the heat dissipation plate 103 via the inlet side bus bar 111 and the heat transfer sheet 115.

As described above, the vehicle-mounted power source distributor according to the second embodiment has substantially the same operational effects as those of the first embodiment, but the manufacturing method of the vehicle-mounted power source distributor is as follows. Unlike the first embodiment, the output-side bus bar 112 (upstream-side bus bar portion 11 having a two-stage structure is provided.
2a, the downstream side bus bar portion 112b) are stored in each compartment of the box body by sequentially stacking them on the heat dissipation plate 103 or the like of the box body 110 in a state where they are separated for each stage. The number of parts is smaller than 1, and the structure is simplified.

The vehicle-mounted power source distributor according to the present invention is not limited to the one manufactured by the above method, and may be manufactured by another method.

Further, the semiconductor switching element used in the present invention is not limited to the FETs 13 and 113, but may be the input side bus bars 11 and 111 and the output side bus bars 12 and 1.
It can be widely applied as long as it includes an energizing terminal connected to the power circuit side formed by 12 and a control terminal connected to the control circuit board side.

[0058]

According to the present invention, not only the thickness dimension,
Since the area itself can also be reduced and the size can be greatly reduced, it is particularly suitable as a vehicle-mounted power source distributor which must be arranged in a narrow space. Also,
In this case, the electronic unit connection side of the output side bus bar and the power supply connection side of the input side bus bar are on the same side of the box, and since the connector parts can be put together on the outer wall of the box, the connector connection becomes easy. As a result, workability at the time of assembling work to the vehicle can be improved.

According to the second aspect of the present invention, since the fuse members can be collectively arranged at exchangeable positions on the outer wall of the box body, the fuse members can be arranged in the box body more than when the fuse members are arranged in the box body. The area can be further reduced, and the maintainability of the vehicle-mounted power distributor can be improved.

According to the third aspect of the present invention, since the control circuit board is directly supported by each bus bar, the thickness dimension of the box body is smaller than that in the case where the bus bar and the control circuit board are separated from each other. It can be further reduced.

According to the fourth aspect of the present invention, the bus bars can be integrated and easily housed in the respective compartments of the box, so that the work efficiency in the assembling work can be improved.

According to the fifth aspect of the present invention, since a reinforcing member or the like for integrating the busbars is not required, the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a diagram showing an external configuration of a vehicle-mounted power source distributor according to a first embodiment of the present invention, in which (a) is a perspective view and (b) is a perspective view.
FIG. 7A is a sectional view taken along line XX in (a).

FIG. 2 is a diagram showing a connection state of each terminal of the FET,
(A) is a plan view, (b) is X'-X 'in (a).
FIG.

FIG. 3 is an exploded perspective view of the vehicle-mounted power source distributor according to the first embodiment of the present invention.

4A and 4B are diagrams showing an external configuration of a vehicle-mounted power source distributor according to the second embodiment of the present invention, in which FIG. 4A is a perspective view and FIG.
FIG. 7A is a sectional view taken along line YY in (a).

FIG. 5 is a diagram showing a connection state of each terminal of the FET,
(A) is a plan view, (b) is Y'-Y 'in (a).
FIG.

FIG. 6 is an exploded perspective view of a vehicle-mounted power source distributor according to the second embodiment of the present invention.

[Explanation of symbols]

1, 101 Main body cover 2, 102 Side cover 3, 103 Heat sink 10, 110 Box body 11, 111 Input side bus bar 12, 112 Output side bus bar 12a, 112a Upstream side bus bar portion 12b, 112b Downstream side bus bar portion 13, 113 FET (Corresponding to semiconductor switching element) 13a, 113a drain terminal 13b, 113b source terminal 13c, 113c gate terminal 14, 114 printed circuit board (corresponding to control circuit board) 15, 115 heat transfer sheet 16, 116 fuse member 17 Reinforced insulation board

Continued front page    (72) Inventor Shigeki Yamane             1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi             Auto Network Technical Laboratory Co., Ltd. (72) Inventor Takahiro Onizuka             1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi             Auto Network Technical Laboratory Co., Ltd. F-term (reference) 5G361 BA04 BB03 BC03

Claims (5)

[Claims] 1. An on-vehicle power source distributor for distributing power from a common power source mounted on a vehicle to a plurality of electronic units, the input side bus bar being connected to the power source, and being connected to each electronic unit. A plurality of output side bus bars, a plurality of semiconductor switching elements provided between the input side bus bar and each output side bus bar, and a control circuit board for controlling the driving of the semiconductor switching elements are arranged in the box body. The output side bus bar is arranged so as to be spaced apart in the thickness direction of the box body and substantially parallel to the upstream side bus bar portion arranged side by side on the substantially same plane as the input side bus bar. And a downstream side bus bar portion, and a fuse member for preventing overcurrent is interposed between both bus bar portions. 2. An end portion of an upstream bus bar portion of the output side bus bar and an end portion of a downstream bus bar portion of the output side bus bar project in substantially the same direction, and the fuse member is straddled across these end portions. 2. The in-vehicle power supply distributor according to claim 1, wherein the power supply is detachably attached. 3. The control circuit board is a sheet, and the input side bus bar and the upstream side bus bar portion of the output side bus bar are adhered to the control circuit board in an insulating state. The in-vehicle power supply distributor according to 1 or 2. 4. The box body is divided into two layers in the thickness direction, and an upstream busbar portion of the input side busbar and the output side busbar and a downstream busbar portion of the output side busbar are integrated in a direction perpendicular to the thickness direction. By moving as
The vehicle-mounted power distributor according to any one of claims 1 to 3, which is configured to be housed in each compartment. 5. The box body is divided into two layers in the thickness direction, and the upstream bus bar portions of the input side bus bar and the output side bus bar and the downstream bus bar portion of the output side bus bar are stacked in this thickness direction in order. The in-vehicle power source distributor according to any one of claims 1 to 3, wherein the in-vehicle power distributor is configured to be housed in each compartment.