JPH08251763A - Connection box with electronic circuit - Google Patents

Abstract

PURPOSE: To connect a power transistor having a relay function which can deal with a large current to an electronic circuit. CONSTITUTION: A connection box with an electronic circuit comprises an electronic circuit container 10b provided at the part of the housing 10 of a bus bar containing connection box in such a manner that the container contains electronic circuit boards 14, 15 made of a PCB(printed circuit board and an FPC (flexible printed circuit) and a bus bar 13 contained in the box and connected to a circuit made of copper foils of the boards 14, 15, wherein large current circuits of thick conductive materials such as copper foils are formed at the parts of the circuits of the boards 14, 15. Power transistors 18, 19 having relay function and installed on the boards are connected to the large current circuits so that relays are formed of electronic components. A standard circuit and an optical circuit are provided as the electronic circuits, and the optional circuit is detachably contained in the box.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric junction box with an electronic circuit for use in a wire harness for an automobile.
PCB (Printed Circuit Board), FPC
An electronic circuit in which the required circuit is formed of a conductive material such as copper foil on an insulating material such as (flexible printed circuit) is attached to an electrical connection box such as a junction box that houses the bus bar, and The present invention relates to a branch connection box configured to connect electronic circuits, and particularly to simplifying the circuit configuration of a bus bar of an electrical connection box and reliably preventing forgetting to mount relays, fuses, and the like.

[0002]

2. Description of the Related Art Conventionally, an electric connection box with an electronic circuit of this type has been proposed in Japanese Utility Model Publication No. 61-205214.
As shown in FIG. 4, the bus bar 3 is accommodated in the housing 2 of the junction box 1, while the electronic circuit board 4 made of PBC is accommodated in the electronic circuit accommodating portion 2a attached to the housing 2, and the end of the bus bar 3 is accommodated. Tabs 3a formed on the electronic parts are projected into the electronic circuit accommodating part 2a and soldered to a circuit made of copper foil or the like of the electronic circuit board 4 to connect the electronic parts 5 to the circuit. It is installed by connecting with.

In the above-mentioned conventional electric connection box with an electronic circuit, usually, only a small current / signal circuit is constituted by the electronic circuit,
The large current circuit is composed of a bus bar and the like. That is, the circuit configuration is generally as shown in FIG. 5, in which the circuit A surrounded by a solid line in the drawing is a bus bar 3 and the circuit B surrounded by a dotted line in the drawing is an electronic circuit made of copper foil or the like. And the tab 3a are connected to each other, and the relays R1, R2, R3 for the defogger, the power window, etc., which are provided in the large current circuit A, are connected to the bus bar via the relay terminals, so a coil type relay is used. It is configured to be mounted on the relay mounting portion 6 provided on the outer surface of the housing of the junction box.

[0004]

In the above-mentioned conventional configuration, since the circuit requiring a large current is not made into an electronic circuit, it is necessary to mount the relay provided in the large current circuit on the housing side of the junction box. However, there was a problem that the relay was forgotten to be mounted when the junction box was assembled.

Further, when it is necessary to connect the relay mounted on the junction box to an electronic circuit that requires the same signal, it is necessary to route the bus bar circuit and connect the electronic circuit to one relay box. However, there is a problem that the bus bar circuit becomes complicated and the weight of the bus bar increases correspondingly.

Further, since the coil type relay connected to the bus bar is larger and heavier than electronic parts,
There is a problem in that the junction box requires a large mounting space, the junction box becomes large and the weight increases, and the bus bar and the relay are connected via the relay terminal, resulting in an increase in the number of parts.

The present invention is intended to solve the above problems, and an object of the present invention is to prevent an electric junction box with an electronic circuit from simplifying a bus bar circuit, forgetting to mount a relay, and increasing the size and weight of a relay. To do.

[0008]

In order to achieve the above-mentioned object, the present invention provides an electronic circuit housing portion in a part of a housing of an electric junction box such as a junction box according to claim 1, and the electronic circuit housing portion is provided. Contains an electronic circuit board made of PCB (Printed Circuit Board), FPC (flexible printed circuit board), etc., and is housed in the electrical connection box in the circuit part made of copper foil of the electronic circuit board. In the electric connection box with an electronic circuit for connecting the bus bar, in the circuit portion of the electronic circuit board, a conductive material such as copper foil has a large thickness, and a large current circuit for connecting to a power transistor having a relay function is provided. An electric junction box with an electronic circuit, characterized in that the relay is made into an electronic component by forming a power transistor installed on an electronic circuit board to the large current circuit. It is intended to provide.

It is preferable that all the relays attached to the electric junction box are made into electronic parts and housed in an electronic circuit housing part. Further, the electronic circuit board is provided with a small current circuit in which the thickness of the conductive material is equal to or less than a constant value together with the large current circuit, and the small current circuit constitutes a signal system circuit or the like. (Claim 2)

According to a third aspect of the present invention, the electronic circuit board to be housed in the electronic circuit housing part of the electric junction box is an electronic circuit board having a standard circuit and an electronic circuit board having an optional circuit. For the above standard circuit, a large current circuit with a thickness of conductive material above a certain level is provided, and the large current circuit is connected to a power transistor equipped with the function of a relay installed on an electronic circuit board. An electrical connection box with an electronic circuit is provided in which the electronic circuit board for the standard circuit is fixed inside the electronic circuit housing portion, while the electronic circuit board for the option circuit is detachably housed in the electronic circuit housing portion. are doing.

[0011]

In the electric junction box with an electronic circuit according to the first aspect of the present invention, the large current circuit for connecting to the power transistor having the function of a relay has a large thickness of copper foil or the like constituting the circuit portion of the electronic circuit board. Is formed as. Therefore, it becomes possible to connect a relay that requires a large current, which was conventionally connected to a bus bar, to an electronic circuit, and as a result, install the relay on the electronic circuit board and store it in the electronic circuit housing section. It can be made into electronic parts.

In the electric connection box with an electronic circuit according to a second aspect of the present invention, the thickness of the copper foil or the like forming the electronic circuit is different,
Since a large current circuit and a small current circuit are provided, a power transistor having a relay function is connected to the large current circuit, while the small current circuit can be used as a signal system circuit in the same manner as in the past. Since the electronic components installed on the electronic circuit board are connected to the circuit and the small current circuit by soldering, etc., the number of components detachably mounted in the electrical junction box is reduced,
It is possible to prevent forgetting to mount these components.

In the electric connection box with an electronic circuit according to a third aspect, the electronic circuit is provided with a standard circuit and an optional circuit,
Circuits required for all models or vehicles of different grades are permanently fixed in the electronic component housing as standard circuits, while optional circuits required for different vehicle types or grades contain electronic components. Since it can be detachably accommodated in the part, the electric connection box can be made highly versatile.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. In the electric connection box with an electronic circuit of the first embodiment shown in FIG. 1, a housing 10 of an electric connection box composed of a junction box is provided with a bus bar housing portion 10a and an electronic circuit housing portion 10b attached to the bus bar housing portion 10a. ing. Specifically, the housing 10 is the lower case 1.
1 and the upper case 12, the lower case 11 and the upper case 12 are formed with bus bar housing portions 11a and 12a, respectively, and part of the side walls of these bus bar housing portions 11a and 12a are projected to house electronic circuits. The portions 11b and 12b are provided.

Inside the busbar housing portion 11a of the lower case forming the busbar housing portion 10a, the busbars 13 are stacked and arranged, and the tip of the required busbar 13 forms the electronic circuit housing portion 10b. The circuit portions of the electronic circuit boards 14 and 15 housed in the electronic circuit housing portion 10b are connected to the tabs formed at the tips of the bus bars 13 by soldering.

The electronic circuit board 14 is an FPC, and 15 is a PC.
Electronic circuit portions 14b and 15b made of a conductive material such as copper foil are formed on the upper surfaces of the insulating substrates 14a and 15a.

Electronic circuit portion 14b of one electronic circuit board 14
Has a large copper foil thickness and a large current circuit through which a large current flows.These large current circuits provide relay functions for defoggers, power window relays, etc. that were conventionally connected to bus bars. It forms a large current circuit that connects to the power transistor.

The electronic circuit portion 15b of the other electronic circuit board 15
Is a small current circuit in which the thickness of the copper foil is smaller than that of the electronic circuit portion 14b and a small current flows as in the conventional case, and a signal system circuit having a function for forgetting to turn off the lamp, a function for detecting forgetting key, etc. is formed. There is.

The electronic circuit accommodating portion 11b of the lower case includes
A partition wall 11c for vertically partitioning the electronic circuit board 14 and the electronic circuit board 15 is formed in a horizontal direction, and the tip of the electronic circuit board 14 arranged above is turned downward to make a U-turn downward to be arranged below. 15, and the copper foils of the electronic circuit portion 14b for the large current circuit and the electronic circuit portion 15b for the small current circuit are connected by welding or the like.

A power transistor 18 having a function of a defogger relay and a power transistor 19 having a function of a power window relay are installed on the upper surface of the insulating substrate 14a of the electronic circuit board 14 arranged above. Terminals 18a and 19a of the power transistors 18 and 19
Is connected to the electronic circuit portion 14b of the large current circuit by soldering.

Similarly, the required electronic devices 20 and 21 are installed on the insulating substrate 15a of the electronic circuit board 15 arranged below, and these terminals 20a and 21a are soldered to the electronic circuit portion 15b for small current. Connected. Moreover, as shown in FIG. 2, the lamp forgetting detection function 22 and the key forgetting detection function 23 are provided.
In the electronic circuit section 15b. The electronic circuit board 14 to which the power transistors 18 and 19 are fixedly connected and the electronic circuit board 15 to which the electronic devices 20 and 21 are fixedly connected are formed in advance before being housed in the electronic circuit housing portion 10b. The electronic circuit accommodating portion 10 is placed every other
It is housed in b.

After the bus bar 13 and the electronic circuit boards 15 and 14 are housed in the bus bar housing portion 11a and the electronic circuit housing portion 11b of the lower case 11 as described above, the upper case 12 is put on the lower case 11 to form a junction box with an electronic circuit. Is assembling.

The circuit configuration of the electronic circuit boards 14 and 15 accommodated in the electronic circuit accommodating portion 10b is as shown in FIG. 2, in which the power transistors 18 and 19 requiring a large current are connected to the electronic circuit. In addition, the lamp forgetting detection function 22 and the key forgetting detection function 23, which are conventionally installed in the electronic circuit, are also configured in the electronic circuit.

Further, as described above, the relay connected to either the large current circuit or the small current circuit is installed on the electronic circuit side, and the relay connected to the bus bar is eliminated. Therefore, it is not necessary to provide a relay mounting portion in the lower case 11 and the upper case 12 that form the bus bar housing portion 10a, and the connector housing portion 25 that is connected to the load side and the power supply side can be provided in the space for that. Higher density branch connection can be made on the bus bar side.

Although the FPC is used as the electronic circuit board 14 and the PCB is used as the electronic circuit board 15 in the first embodiment, all the circuits are FPC (flexible print.
Circuit) or PBC (print circuit
Needless to say, a board) may be used, and in that case as well, the thickness of the copper foil may be increased to form a large current circuit.

FIG. 3 shows a second embodiment of the present invention in which the electronic circuit is divided into an electronic circuit board 30 provided with a standard circuit and an electronic circuit board 31 provided with an optional circuit, and the electronic circuit board of the standard circuit is provided. The electronic circuit section of 30 is permanently connected to the bus bar by soldering, while the electronic circuit section of the electronic circuit board 31 of the optional circuit is detachably connected.

The electronic circuit boards 30 and 31 are both made of PCB. The standard circuit electronic circuit board 30 is made of copper foil to make a large current circuit, while the optional circuit electronic circuit board 31 is made of copper. The foil is thin to make a small electronic circuit.

In the junction box of the second embodiment, the bus bar 13 and the insulating plate 32 are laminated and arranged on the entire surface of the lower case 11, and a part of the uppermost insulating plate 32 is provided with an electronic circuit board installation portion. . The electronic circuit board installation section installs an electronic circuit board 30 of a standard circuit, and inserts a tab 13a of the bus bar 13 arranged below into a tab hole 30a formed in the electronic circuit board 30, and these tabs 13a and the electronic circuit. The electronic circuit of the plate 30 is permanently connected with solder. Since the standard circuit is a large current circuit, a power transistor having a function of a relay for power supply and a relay for power supply which requires a large current, which is conventionally connected to a bus bar, is provided on the insulating substrate 30a of the electronic circuit board 30. Fix the terminals of these power transistors 18 and 19 to the insulating plate 30a.
It is connected to the electronic circuit made of copper foil formed above by soldering. Further, on the electronic circuit board 30 of the standard circuit, a connector portion 33 for connection with an optional circuit is provided.

As described above, the electronic circuit board 31 of the optional circuit is a small current circuit, and the electronic parts connected to these small current circuits are attached to the electronic circuit board 31 and provided on the electronic circuit board 30. Connector part 3 for connection
A connector 35 that fits into the connector 3 is provided. Therefore, when an optional circuit is required, the connector 35 is fitted into the connecting connector portion 33, and the optional electronic circuit board 31 is detachably attached to the electronic circuit board installation portion on the insulating plate 32. .

The electronic circuit board 30 of the above standard circuit,
If necessary, the upper case (not shown) is installed in the lower case 1 with the electronic circuit board 31 of the optional circuit installed.
The junction box is assembled with the electronic circuit housed on top of 1.

In the second embodiment, the electronic circuit board 30 of the standard circuit is provided with only the large current circuit, while the electronic circuit board 31 of the option circuit is provided with only the small current circuit, but the configuration is limited to this. Not, the standard circuit electronic circuit board 30
On the other hand, a large current circuit and a small current circuit, which are indispensable for any vehicle, may be provided, while the electronic circuit board of the optional circuit may be provided with the large current circuit and the small current circuit required depending on the vehicle type. That is, a large current circuit and a small current circuit may be provided together with both the standard circuit and the option circuit.

[0032]

As is apparent from the above description, in the electric junction box with an electronic circuit according to claim 1 of the present invention, a large current circuit is provided in the electronic circuit, and the relay connected to the large current circuit is Since it is installed on the electronic circuit board instead of the power transistor having the function of the relay and the power transistor is connected to the electronic circuit side, the relay is made into an electronic component,
Eliminating the work of inserting the relay into the electric junction box during vehicle assembly. As a result, it is possible to surely prevent the relay from being forgotten and reduce the assembly work. Furthermore, since a relay that connects to a large current can be converted from a coil-type relay for busbar connection to an electronic component, the relay can be made smaller and lighter, and the busbar circuit can be routed to both the relay and the electronic circuit. It is not necessary, and the number of bus bars can be reduced or the shape can be simplified.

In the electric connection box with an electronic circuit according to claim 2,
Since the electronic circuit is provided with the large current circuit and the small current circuit, the power transistor and the electronic component having the function of the relay corresponding to the large current circuit and the small current circuit can be connected and attached in advance. Therefore, the assembly work of the electric junction box becomes extremely easy.

In the electric connection box with an electronic circuit according to claim 3,
A standard circuit and an optional circuit are provided in the electronic circuit, and the circuit required for all vehicles or vehicles of different grades in the same vehicle type is fixed as a standard circuit in the electrical junction box, while depending on the vehicle type or grade. Necessary optional circuits can be detachably accommodated as needed, so that the electric junction box can be applied regardless of the vehicle type and grade, and has high versatility.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram of the electronic circuit of the first embodiment.

FIG. 3 is an exploded perspective view of a second embodiment of the present invention.

FIG. 4 is a perspective view of a conventional example.

FIG. 5 is a circuit diagram of a conventional example.

[Explanation of symbols]

10 Housing 10a Busbar Housing 10b Electronic Circuit Housing 11 Lower Case 12 Upper Case 13 Busbar 14 Electronic Circuit Board for Large Current Circuit 15 Electronic Circuit Board for Small Current Circuit 18 Power Transistor 19 with Defiga Relay Function Transistor with power relay function 30 Standard circuit electronic circuit board 31 Optional circuit electronic circuit board

Claims (3)

[Claims] 1. An electronic circuit accommodating portion is provided in a part of a housing of an electric connection box for accommodating a bus bar, and the electronic circuit accommodating portion is provided with P.
CB (Printed Circid Board), FPC
In an electric connection box with an electronic circuit for accommodating an electronic circuit board made of (flexible printed sirkid) or the like, and connecting the bus bar accommodated in the electric connection box to a circuit portion made of copper foil or the like of the electronic circuit board , A part of the circuit part of the electronic circuit board is made of a conductive material such as copper foil with a large thickness to form a large current circuit connected to a power transistor having a relay function, and is installed on the electronic circuit board. An electric junction box with an electronic circuit, wherein the power transistor is connected to the large current circuit to make the relay an electronic component. 2. The electronic circuit board is provided with a small current circuit having a thickness of a conductive material equal to or less than a constant value together with the large current circuit, and the small current circuit constitutes a signal system circuit or the like. Item 1. An electrical connection box with an electronic circuit according to Item 1. 3. An electronic circuit accommodating portion is provided in a part of a housing of an electric connection box for accommodating a bus bar, and the electronic circuit accommodating portion is provided with P.
CB (Printed Circid Board), FPC
In an electric connection box with an electronic circuit for accommodating an electronic circuit board made of (flexible printed sirkid) or the like, and connecting the bus bar accommodated in the electric connection box to a circuit portion made of copper foil or the like of the electronic circuit board The electronic circuit board accommodated in the electronic circuit housing portion of the electric junction box is divided into an electronic circuit board forming a standard circuit and an electronic circuit board forming an optional circuit, and a conductive material is used for the standard circuit. A large current circuit having a thickness of a certain value or more is provided, and the large current circuit is connected to a power transistor having a function of a relay installed on the electronic circuit board, and the electronic circuit board for the standard circuit is an electronic circuit housing. An electrical connection box with an electronic circuit, wherein the electronic circuit board for the option circuit is detachably accommodated in the electronic circuit accommodating portion while being fixed inside the portion.