JPH0578126U - Electrical junction box - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an electrical junction box that can satisfactorily dissipate heat from an intelligent power switch. [Structure] A printed circuit board 14 is housed in a chamber formed by a lower case and an upper case. The male terminals 16 of the plurality of intelligent power switches 12 having relay and fuse functions are soldered to the circuit pattern 15 of the printed board 14. These intelligent
The power switch 12 is fixed to the bus bar 3 made of copper alloy or the like mounted on the printed circuit board 14 with a screw 17 to perform thermal and mechanical connection.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electrical junction box incorporating an intelligent power switch.

[0002]

[Prior Art]

 As shown in FIG. 10, a conventional electrical junction box has a plurality of bus bars 3 for wiring, which are insulated from each other by an insulating plate 4 in a room formed by a lower case 1 and an upper case 2 in a stacked arrangement. A fuse connection connector 6 for connecting the fuse 5 and a relay connection connector 8 for connecting the relay 7 are provided on the upper surface, and intermediate terminals 9 are incorporated in these connectors 6 and 8, respectively, and The terminal 9 and the bus bar 3 are connected by inserting a tab terminal 3a provided upright at the end of the bus bar 3, and the fuse 5 and the fuse connecting connector 6 connect the terminal 5a of the fuse 5 to the intermediate terminal 9 The relay 7 and the relay-connecting connector 8 are connected by inserting the terminal 7a of the relay 7 into the intermediate terminal 9.

As shown in FIG. 11, such an electric junction box has a circuit structure in which electric currents from a power source (not shown) are supplied to each load 10 via a fuse 5 and a relay 7, respectively. Reference numeral 11 is a multiplexing unit that sends a control signal to each relay 7.

However, in such a conventional electrical junction box, a large number of fuses 5 and relays 7 are used, and thus there is a problem in that the size is increased. In addition, since the number of parts to be incorporated is large, the number of assembling steps is large, which causes a problem of cost increase. Further, when the fuse is blown, the fuse 5 needs to be replaced, which is troublesome.

In order to solve such a problem, recently, in place of the fuse 5 and the relay 7, an intelligent device having a control logic IC and a high output power MOS FET driving a high withstand voltage and a large current on a one-chip chip -Using the power switch (IPS) 12 to construct a circuit of an electric junction box as shown in FIG. 12 is being studied. Reference numeral 13 is a control unit that gives a control signal to each intelligent power switch 12.

The intelligent power switch 12 as described above can directly drive a power load (solenoid, lamp, motor, etc.) from a microcomputer (not shown), and has an intelligent function capable of protection and diagnosis. I have.

[0007]

[Problems to be solved by the device]

 However, since the intelligent power switch 12 generates a large amount of heat, abnormal heat generation locally occurs in the room formed by the lower case 1 and the upper case 2, which makes practical application difficult.

An object of the present invention is to provide an electric connection box that can favorably dissipate heat from an intelligent power switch.

[0009]

[Means for Solving the Problems]

 To explain the structure of the present invention to achieve the above object, the present invention is an electrical junction box using an intelligent power switch to control the energization of a load, wherein the intelligent power switch is a bus bar. It is characterized by being thermally connected.

[0010]

[Action]

 When the intelligent power switch is thermally connected to the bus bar in this manner, the heat of the intelligent power switch can be dispersed and released through the bus bar.

Therefore, it is possible to prevent local abnormal heat generation in the intelligent power switch, improve heat dissipation, and eliminate problems in implementation. Further, since the bus bar in the electric junction box can be used as the heat radiating portion, it is not necessary to provide a special heat radiating portion.

[0012]

【Example】

 FIG. 1 shows a first embodiment of an electrical junction box according to the present invention. In the electric junction box of this embodiment, a printed circuit board 14 is built in, and a plurality of intelligent power switches 12 are electrically connected by soldering a male terminal 16 to a circuit pattern 15 of the printed circuit board 14. ing. The intelligent power switch 12 has a relay and a fuse function as described above. The intelligent power switch 12 is fixed to the bus bar 3 made of copper alloy or the like mounted on the printed circuit board 14 with a screw 17 for thermal and mechanical connection. In this case, the mounting is not limited to the screw 17, but rivets, welding, etc. may be used.

When the intelligent power switch 12 is thermally connected to the bus bar 3 as described above, the heat of the intelligent power switch 12 can be dispersed and radiated through the bus bar 3. Therefore, the local abnormal heat generation in the intelligent power switch 12 can be prevented, the heat radiation is improved, and the problem does not occur in practice. In addition, since the bus bar 3 in the electric connection box can be used as the heat radiating portion, it is not necessary to provide a special heat radiating portion.

The bus bar 3 may also be used as another circuit through which an electric current is passed, or may be provided exclusively for heat radiation.

Further, in this case, when the bus bar 3 is mechanically fixed to the printed circuit board 14, the intelligent power switch 12 can be fixed not only by soldering the male terminal 16 but also by the bus bar 3. Therefore, the fixing reliability of the intelligent power switch 12 can be improved.

2 to 4 show a second embodiment of the electrical junction box according to the present invention. In the electric junction box of this embodiment, the heat sink 20 with the female terminal 19 is built in the molded resin body 18 of the intelligent power switch 12, and the male terminal 16 is led out from the connection port 19a of the female terminal 19. It is arranged so as to face the opening 21 on the surface of the molded resin molded body 18.

In this case, as shown in FIG. 4, the bus bar 3 is connected to the female terminal 19 of the heat sink 20 by inserting the tab terminal 3 a of the bus bar 3 from the opening 21 of the intelligent power switch 12. .

5 to 6 show a third embodiment of the electrical junction box according to the present invention. In the electrical junction box of this embodiment, the tab terminal 3a of the bus bar 3 is inserted from the opening 21 of the intelligent power switch 12 so that the tab terminal 3a of the bus bar 3 becomes an input / output terminal of the intelligent power switch 12. It shows an example of use as a part.

With this configuration, the electric capacity of the intelligent power switch 12 can be improved.

7 to 9 show a fourth embodiment of the electrical junction box according to the present invention. In the electric junction box of this embodiment, the intelligent power switch 12 is provided with a single opening 21, and the tab terminal 3a of the bus bar 3 is inserted into the opening 21 to fix the intelligent power switch 12. And an example in which heat is dissipated. In this case, the bus bar 3 connected to the intelligent power switch 12 is fixed to the insulating plate 4 with rivets 22 so as not to move.

As described above, if the fixing of the intelligent power switch 12 is performed by fixing the male terminal 16 to the insulating plate 4 via the tab terminal 3a in addition to fixing the male terminal 16 to the half pad, the intelligent power switch 12 is fixed. The reliability of can be improved.

[0022]

[Effect of the device]

 As described above, in the electric connection box according to the present invention, the intelligent power switch is thermally connected to the bus bar, so that the heat of the intelligent power switch can be dispersed and radiated through the bus bar. . Therefore, the local abnormal heat generation in the intelligent power switch can be prevented, the heat radiation is improved, and the problem does not occur in the implementation. In addition, since the bus bar in the electric junction box can be used as the heat radiating portion, it is not necessary to provide a special heat radiating portion. Furthermore, it becomes easy to secure the installation space for the heat dissipation part.

[Brief description of drawings]

FIG. 1 is a perspective view showing a relationship among a printed circuit board, an intelligent power switch, and a bus bar in a first embodiment of an electric junction box according to the present invention.

FIG. 2 is a perspective view showing the structure of an intelligent power switch in a second embodiment of the electrical junction box according to the present invention.

FIG. 3 is a perspective view of a heat sink with terminal used in FIG.

FIG. 4 is a perspective view showing a configuration of a main part of a second embodiment of the electrical junction box according to the present invention.

FIG. 5 is a perspective view showing the structure of an intelligent power switch in a third embodiment of the electrical junction box according to the present invention.

6 is a perspective view showing a state in which a tab terminal of a bus bar is inserted in the intelligent power switch shown in FIG.

FIG. 7 is a perspective view showing the structure of an intelligent power switch in a fourth embodiment of the electrical junction box according to the present invention.

FIG. 8 is a perspective view of the intelligent power switch shown in FIG. 7 viewed from another direction.

FIG. 9 is a perspective view showing a main configuration of a fourth embodiment of an electrical junction box according to the present invention.

FIG. 10 is an exploded perspective view of an electrical junction box using a conventional fuse and relay.

11 is an electric circuit diagram of the electric junction box shown in FIG.

FIG. 12 is an electric circuit diagram of an electric junction box using an intelligent power switch.

[Explanation of symbols]

1 ... Lower case, 2 ... Upper case, 3 ... Bus bar, 3a ... Tab terminal, 4 ... Insulation plate, 5 ... Fuse, 7 ...
Relay, 10 ... Load, 12 ... Intelligent power switch, 13 ... Control unit, 14 ... Printed circuit board, 15 ...
Circuit pattern, 16 ... Male terminal, 17 ... Screw, 18 ... Molded resin molding, 19 ... Female terminal, 20 ... Heat sink, 21 ...
Opening, 22 ... Rivet.

Claims (1)

[Scope of utility model registration request] 1. An electrical junction box using an intelligent power switch to control energization of a load, the intelligent power switch being thermally connected to a bus bar. box.