JP2006062599A - Electrical unit control system and electric junction box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical unit control system and an electric junction box capable of reducing the design cost and the manufacturing cost. <P>SOLUTION: An individual electric junction box 5 to store a relay to control connection/disconnection of an individual electrical unit group to be used only in the same vehicle model, and a common electric junction box 4 to store relays 22A, 22B, 22C and 22D to control connection/disconnection of a common electrical unit group to be used even in other vehicle models are stored in a fuse box 12. When the design is changed, only a section related to the relay to control connection/disconnection of the individual electrical unit group may be designed, and the design cost of the individual electric junction box 5 can be reduced. Further, the relays 22A, 22B, 22C and 22D can be used for other vehicle models, the common electric junction box 4 is also used for other vehicle models if once designed, and the design cost can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrical component control system and an electrical junction box for controlling disconnection of electrical components of an automobile.

Conventionally, what was disclosed by patent document 1 is known as an example of this kind of electrical component control system. This device controls electrical disconnection of electrical components such as horns and headlights mounted on automobiles by means of an electrical connection box in which a circuit structure in which switching elements are mounted on a single circuit board is housed in a housing. Is.
JP 2003-164039 A

  There are a group of individual electrical components used only in the same vehicle type and a group of common electrical components used also in other vehicle types. For this reason, when using the electrical junction box for different vehicle types, it is necessary to change the design of the switching elements for controlling the individual electrical component groups and the circuits related thereto for each vehicle type. In this case, it seems that only the design related to the switching element that controls the individual electrical component group needs to be changed.

  However, in the conventional electrical junction box, the switching element for controlling the individual electrical component group and the switching element for controlling the common electrical component group are mounted on a single circuit board without being divided. In order to make a design change related to the switching element that controls the individual electrical component group, it is necessary to redesign the circuit board including the switching element that controls the common electrical component group. Therefore, there is a problem that it is difficult to reduce the design cost.

  In addition, there is a problem that it is difficult to reduce the manufacturing cost because it is necessary to manufacture electrical junction boxes having different specifications for each vehicle type.

  The present invention has been completed based on the above circumstances, and an object thereof is to provide an electrical component control system and an electrical junction box with reduced design costs and manufacturing costs.

As a means for achieving the above object, the invention of claim 1 is an electrical component control system for controlling electrical disconnection of a vehicle electrical component, wherein the electrical component is used only in the same vehicle type. It is divided into an individual electrical component group and a common electrical component group that is also used in other vehicle types. The individual electrical component group and the common electrical component group are each disconnected by a switching element group mounted on a separate circuit board. It is characterized by having a controlled configuration.
Here, the “vehicle type” is a concept including a difference in displacement and a difference in specifications.

  The invention according to claim 2 is an electrical junction box for controlling disconnection of electrical components of an automobile, wherein a switching element for controlling a group of individual electrical components used only in the same vehicle type is mounted on a circuit board. An individual circuit component and a common circuit component on which a switching element for controlling a common electrical component group used also in other vehicle types is mounted on a circuit board different from the circuit board is provided. .

  According to a third aspect of the present invention, in the second aspect, the common circuit configuration body and the individual circuit configuration body are housed in different housings, and the common circuit configuration is separated from the housing of the common circuit configuration body. The terminal group connected to the body switching element is projected.

  According to a fourth aspect of the present invention, the housing for housing the common circuit component and the individual circuit component is accommodated in a main housing that includes them, and the main housing includes the housing. The relay controlled by the said common circuit structure and / or the said separate circuit structure is arrange | positioned, It is characterized by the above-mentioned. Here, the “relay controlled by the common circuit component and / or the individual circuit component” is controlled only by the individual circuit component when the relay is controlled only by the common circuit component. And cases controlled by both the common circuit component and the individual circuit component.

  According to a fifth aspect of the present invention, in the method according to any one of the second to fourth aspects, the common circuit structure is configured by a metal base printed wiring board in which a circuit is formed on a metal substrate through an insulating layer. It is characterized by that.

  According to a sixth aspect of the present invention, in the fifth aspect, the metal base printed wiring board constitutes a part of the outer surface of the housing.

<Invention of Claims 1 and 2>
According to the first and second aspects of the present invention, the switching element that controls the common electrical component group and the switching element that controls the individual electrical component group are mounted on different circuit boards. For this reason, when designing a circuit board on which switching elements for controlling individual electrical component groups are mounted, it is only necessary to change the design related to the switching elements that control individual electrical component groups. Can be reduced. On the other hand, circuit boards equipped with switching elements for controlling the common electrical components group do not need to have different specifications for each vehicle type, so once designed, they can be used for other vehicle types. In contrast, the design man-hours when using the electrical junction box can be reduced. As described above, according to the present invention, the design man-hours can be reduced as the entire electrical component control system, so that the design cost can be reduced.

  In addition, since the circuit board on which the switching element for controlling the common electrical component group is mounted can be used for a plurality of vehicle types, the manufacturing cost can be reduced by mass production.

<Invention of Claim 3>
According to the invention of claim 3, since the terminal groups connected to the switching elements of the common circuit constituting body project from the housing, the connectors connectable to these terminal groups are arranged outside the housing, and this connector And the terminal group can be easily connected to the switching element of the common circuit structure and the circuit outside the housing.

<Invention of Claim 4>
According to the invention of claim 4, since the common circuit component and the individual circuit component are double-enclosed by the housing housing the main circuit component and the main housing, the waterproof property of the electrical junction box is improved. Can do.

  In addition, since the relay controlled by the common circuit component and / or the individual circuit component is arranged in the main housing, the conductive path connecting the common circuit component and / or the individual circuit component and the relay. Can be miniaturized. Thereby, the system related to the electrical junction box can be reduced in size as a whole.

<Invention of Claim 5>
Since the common electrical component group is also used in other vehicle types, it is related to the basic functions for automobiles. According to the fifth aspect of the present invention, the heat generated from the switching elements that control these common electrical component groups can be absorbed by the metal substrate, so that the malfunction of the switching elements due to the heat can be prevented. Thereby, the reliability with respect to the fundamental function of a motor vehicle can be improved.

<Invention of Claim 6>
According to the invention of claim 6, since the metal base printed wiring board constitutes a part of the outer surface of the housing, a part of the outer surface of the housing can be omitted. Thereby, the electrical junction box which accommodates a common circuit structure can be reduced in size.

An embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the electrical component control system of the present embodiment accommodates a common electrical connection box 4 and an individual electrical connection box 5 in a relay box 3 disposed in the engine room 2 of the automobile 1. Is.

  The relay box 3 is formed by forming a relay mounting portion 7 for mounting the relay 40 in a synthetic resin main housing 6. A relay 40 is mounted on the relay mounting portion 7, and the relay 40 is electrically connected to a circuit (not shown) formed in the relay mounting portion 7. In the main housing 6, a relay box side connector (not shown) for fitting with an individual electrical component connector (not shown) and a common electrical component connector 9 which will be described later is formed. A terminal fitting (not shown) is accommodated in the side connector. The terminal fitting and the circuit formed in the relay mounting portion 7 are electrically connected.

  The individual electrical junction box 5 has a circuit board 41 accommodated in a synthetic resin housing 10A. A relay 43 (corresponding to a switching element) is mounted on the circuit board 41 to form an individual circuit component 42. An individual electrical component connector (not shown) is attached to the housing 10 </ b> A of the individual electrical junction box 5. This individual electrical component connector has a fitting portion (not shown) so that the relay box side connector can be fitted. A terminal fitting (not shown) connected to the relay 43 is accommodated in the fitting portion. The individual electrical component connector and the relay box side connector are fitted, and the terminal fittings accommodated in the individual electrical component connector are electrically connected to the terminal fittings accommodated in the relay box side connector.

  As shown in FIG. 2, the common electrical junction box 4 includes a flat rectangular electrical junction box body 11 with a square fuse box 12 attached to an upper side surface in FIG. 2 and a common electrical component on a lower side surface in FIG. 2. The connector 9 is attached.

  The electrical junction box body 11 accommodates a circuit board 13 in a synthetic resin housing 10B having a substantially U-shaped cross section so as to cover an opening surface formed below in FIG. .

  A fuse box fixing portion 14 for screwing the fuse box 12 is formed at a position near both ends of the upper side surface in FIG. 4 in the housing 10B. The fuse box fixing portion 14 includes a fuse box fixing portion 14 in FIG. Two screw holes 15 facing in the vertical direction are formed. Further, in the housing 10B, circuit board fixing portions 16 for screwing the circuit board 13 are formed at the four corners of the lower side surface in FIG. 5, and this circuit board fixing portion 16 has the circuit board fixing portion 16 in FIG. Four screw holes 15 facing in the vertical direction are formed.

  As shown in FIG. 4, the circuit board 13 has a substantially rectangular shape, and through holes 17 are formed at the four corners as shown in FIG. By screwing screws 18 into the insertion holes 17 and the screw holes 15 of the circuit board fixing portion 16, the circuit board 13 is fixed so as to cover the lower opening of the housing 10B in FIG. . In the circuit board 13, for example, an insulating layer (not shown) is formed on one surface of a metal substrate 19 made of aluminum by, for example, anodizing, and the circuit 20 is formed on the surface of the insulating layer by, for example, printed wiring means. The metal base printed wiring board 21 is used. A plurality of (four in this embodiment) relays 22A, 22B, 22C, 22D (corresponding to switching elements) are soldered to the circuit 20 to form a common circuit structure 23. The relays 22A, 22B, 22C, and 22D are juxtaposed in the left-right direction in FIG.

  A common electrical component connector 9 made of synthetic resin is attached to the lower end of the housing 10B in FIG. The common electrical component connector 9 has a hood portion 24 and can be fitted with a relay box side connector (see FIG. 3). A plurality of terminal fittings 25 pass through the bottom wall of the hood portion 24 and are arranged in the left-right direction in FIG. The terminal fitting 25 includes an upright portion 26 extending in the vertical direction in FIG. 6, a soldering portion 27 extending leftward from the lower end portion of the upright portion 26 in FIG. 6, and a right side in FIG. 6 from the upper end portion of the upright portion 26. And a connecting portion 28 (corresponding to a terminal group in claim 3) extending in the direction. The soldering portion 27 is soldered to the circuit 20 at a position near the lower end of FIG. Moreover, the connection part 28 has the form which penetrated the bottom wall of the food | hood part 24, and protruded from the housing 10B. The common electrical component connector 9 and the relay box side connector are fitted together, and the connection portion 28 of the terminal fitting 25 attached to the common electrical component connector 9 is electrically connected to the terminal fitting accommodated in the relay box side connector. Connected. As shown in FIG. 2, the common electrical connection box 4 is accommodated in the relay box 3 with the common electrical component connector 9 facing downward.

  The fuse box 12 is made of synthetic resin, and a recess 29 is formed near the left and right ends of the upper side surface in FIG. 4, and the insertion hole 17 facing the vertical direction in FIG. 4 is formed in the recess 29. Has been. The screw box 18 is screwed into the insertion hole 17 and the screw hole 15 of the fuse box fixing portion 14, whereby the fuse box 12 is fixed to the housing 10B. 4 of the upper side surface of FIG. 4 of the fuse box 12 is formed in a shape recessed downward in FIG. 4, and fuse mounting portions 30, 30 for mounting a fuse 36 to be described later. Two are formed. The fuse terminal fittings 31 penetrate through the bottom walls of the fuse mounting portions 30 and 30 and are arranged in the left-right direction in FIG. The fuse terminal fitting 31 includes an upright portion 32 extending in the vertical direction in FIG. 6, a soldering portion 33 extending from the lower end portion of the upright portion 32 to the right in FIG. 6, and the right end portion of the upright portion 32 in FIG. 4 and a connecting portion 34 extending upward in FIG. The soldering portion 33 is soldered to the circuit 20 at a position near the upper end of FIG. In addition, a slit 35 that opens to the distal end side is formed at the distal end of the connection portion 34, and when the terminal 37 of the fuse 36 is fitted, the terminal 37 of the fuse 36 can be sandwiched. The connecting portion 34 penetrates the bottom wall of the fuse mounting portion 30.

  The fuse 36 includes a substantially rectangular parallelepiped main body 38 and a terminal 37 protruding from the main body 38. The fuse 36 is inserted into the fuse mounting portion 30, and the terminals 37 of the fuse 36 are inserted into the slits 35 formed in the connection portion 34 of the fuse terminal fitting 31, whereby the fuse terminal fittings 31 are electrically connected to each other. It is connected to the.

  Now, the relay 43 accommodated in the individual electric junction box 5 cuts off, for example, a fog lamp (not shown), a radio / audio (not shown), a winker (not shown), a horn (not shown), or the like. Electric control. Since these electrical component groups have different specifications for each vehicle type and are used only in the same vehicle type, they are classified into individual electrical component groups. On the other hand, the relays 22A, 22B, 22C, and 22D accommodated in the common electrical / electrical connection box 4 are a first relay 22A that controls on / off of a wiper motor (not shown) and a second relay that controls the rotation speed of the wiper motor. The relay 22B includes a third relay 22C that controls on / off of the right headlight (not shown), and a fourth relay 22D that controls on / off of the left headlight (not shown). These wiper motors and left and right headlights have the same specifications in different vehicle types, and are also used in other vehicle types, so they are classified into a common electrical component group.

Next, the operation and effect of this embodiment will be described.
When designing the individual electrical junction box 5 and the common electrical junction box 4 according to the present embodiment, the following procedure is performed. First, determine the specifications of the relay 43 that controls switching of individual electrical components used only in the same vehicle type, such as fog lamps, radio / audio, blinkers, horns, etc., and design a circuit that connects these relays 43 . Thereafter, the mechanism design of the individual electrical connection box 5 such as the individual electrical component connector and the housing 10A is performed. At this time, the relays 22A, 22B, 22C, and 22D that control the ON / OFF of the wiper motor, the adjustment of the rotational speed of the wiper motor, and the ON / OFF of the left and right headlights are accommodated in the common electrical connection box 4, It is not necessary to design for 22B, 22C, and 22D. For this reason, when both the circuit related to the relay 43 that controls the individual electrical component group and the circuit related to the relays 22A, 22B, 22C, and 22D that control the common electrical component group are designed for each vehicle type as in the past. Compared with the design man-hours can be reduced.

  Next, specifications of relays 22A, 22B, 22C, and 22D that control ON / OFF of the wiper motor, adjustment of the rotational speed of the wiper motor, and ON / OFF of the left and right headlights are determined, and these relays 22A, 22B, 22C, and 22D are connected. Design the circuit. Thereafter, the mechanism design of the common electrical connection box 4 such as the common electrical component connector 9 and the housing 10B is performed. The relays 22A, 22B, 22C, 22D accommodated in the common electrical junction box 4 can be used in other vehicle types. As a result, when the common electrical junction box 4 is used for different vehicle types, it is not necessary to newly design a circuit or a mechanism, so that the design man-hour can be reduced.

  As described above, according to the present embodiment, the design man-hours can be reduced as the entire electrical component control system, so that the design cost can be reduced.

  Since the common electrical junction box 4 on which the relays 22A, 22B, 22C, and 22D for controlling the wiper motor and the left and right headlights are mounted can be used for a plurality of vehicle types, the manufacturing cost is reduced by mass production. Can be made.

  Further, since the relay 40 controlled by the common circuit component 23 and / or the individual circuit component 42 is disposed in the main housing 6, the common circuit component 23 and / or the individual circuit component 42, The conductive path connecting to the relay 40 can be reduced in size. Thereby, the system related to the electrical junction box can be reduced in size as a whole.

  And according to this embodiment, the opening surface provided in the housing 10 </ b> B of the common electrical junction box 4 is covered with the metal base printed wiring board 21. Thereby, since one side of the housing 10B can be omitted, the common electrical junction box 4 can be reduced in size.

  And since the four relays 22A, 22B, 22C, and 22D are accommodated in the common electrical junction box 4, it is small. Thereby, since the layout of the common electrical junction box 4 in the main housing 6 becomes free, space efficiency can be improved.

  And since the circuit 20 is formed by the printed wiring means, the common electrical junction box 4 can make a wiring density large compared with the case where the circuit 20 is formed by a bus bar.

  In addition, a common electrical component connector 9 is disposed in the housing 10B of the common electrical connection box 4, and the common electrical component connector 9 has terminal fittings connected to the relays 22A, 22B, 22C, and 22D. 25 is housed. Thereby, the relays 22A, 22B, 22C, and 22D accommodated in the common electrical connection box 4 can be obtained by fitting the common electrical component connector 9 and the relay box side connector provided in the relay box 3. The circuit outside the housing 10B can be easily connected.

  Further, since the common circuit component 23 and the individual circuit component 42 are double-enclosed by the housings 10A and 10B that house the common circuit component 42 and the main housing 6, the common electric junction box 4 and the individual electric junction box 5 are included. The waterproofness can be improved.

  The common electrical junction box 4 houses relays 22C and 22D for controlling on / off of the headlights, and relays 22A and 22B for controlling on / off of the wiper motor and rotation speed. The headlight is related to a function for ensuring forward visibility during nighttime travel, and a wiper (not shown) driven by a wiper motor is installed in front or rear during rainy weather. This is related to a function for ensuring visibility, and both are related to the basic function of the automobile 1. In the present embodiment, since the common circuit configuration body 23 is configured by the metal substrate 19, heat generated from the relays 22 </ b> A, 22 </ b> B, 22 </ b> C, and 22 </ b> D can be absorbed by the metal substrate 19. As a result, malfunctions of the relays 22A, 22B, 22C, and 22D due to heat can be prevented, so reliability for a function of ensuring forward visibility during night driving and forward or backward visibility during rainy driving are possible. It is possible to improve the reliability of the function for ensuring the above.

  Moreover, according to this embodiment, the common electrical junction box 4 has four relays 22A, 22B, 22C, and 22D arranged in parallel in the left-right direction of FIG. And the terminal metal fitting 25 of the connector 9 for common electrical components and the terminal metal fitting 31 for fuses are also arranged in parallel in the left-right direction of FIG. As a result, when the relays 22A, 22B, 22C, 22D and the terminal fitting 25 or the fuse terminal fitting 31 are connected by the circuit 20, it is possible to shorten a bypass for bypassing other relays. 20 can be shortened as a whole. Thereby, the power consumption by the circuit 20 can be reduced.

<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) In this embodiment, the relays 22A, 22B, 22C, and 22D mounted on the common electrical junction box 4 are mounted on the circuit board 13 so as to be aligned in the left-right direction in FIG. The relays 22A, 22B, 22C, and 22D can be arranged at any position on the circuit board 13 such as being mounted so as to be aligned in the vertical direction in FIG.

  (2) In the present embodiment, the switching elements mounted on the electrical junction box are the relays 43, 22A, 22B, 22C, and 22D, but are not limited thereto, and may be semiconductor switching elements.

  (3) In the present embodiment, one side of the housing 10B of the common electrical junction box 4 is open, and the metal substrate 19 is attached so as to cover the opening. However, the present invention is not limited to this, and there is no opening. The metal substrate 19 may be housed in the housing 10B.

  (4) In the present embodiment, the circuit board 13 of the common electrical connection box 4 is formed by forming an insulating layer on the metal board 19, but is not limited to this, and the circuit board 13 is accommodated in the housing 10 </ b> B. If it is a form to be used, as the circuit board 13, what hardened | cured the prepreg, a synthetic resin board | substrate, a ceramic substrate etc. can be used, for example.

  (5) In the present embodiment, the connection portion 28 connected to the relays 22A, 22B, 22C, and 22D protrudes from the housing 10B that houses the common circuit structure 23. However, the present invention is not limited thereto. For example, when it is configured to connect to a circuit outside the housing 10B by an electric wire connected to the relays 22A, 22B, 22C, 22D, the connection portion 28 may not be protruded from the housing 10B of the common circuit component 23. Good.

  (6) In the present embodiment, the common circuit configuration body 23 and the individual circuit configuration body 42 are configured to be accommodated in the separate housings 10A and 10B. The individual circuit component 42 may be accommodated in the same housing.

  (7) In the present embodiment, the common electrical junction box 4 and the individual electrical junction box 5 are configured to be accommodated in the relay box 3, but are not limited thereto. For example, the waterproofness of the housings 10 </ b> A and 10 </ b> B is improved. When it raises, it is good also as a structure by which the common electric junction box 4 and the individual electric junction box 5 or either one is arrange | positioned outside the relay box 3. FIG.

  (8) In the present embodiment, the circuit board 13 constituting the common circuit structure 23 has an insulating layer formed on the surface of the aluminum metal substrate 19 by anodizing, and then a conductive pattern is formed by printed wiring means. The circuit 20 may be formed on the surface of the metal substrate 19 made of aluminum by anodizing, and then printed on the surface coated with an epoxy resin by printed wiring means. Alternatively, the circuit 20 may be formed by baking an enamel layer on an iron plate, and printing and baking a thick film conductive ink.

  (9) In the present embodiment, four relays 22A, 22B, 22C, and 22D are mounted on the common circuit configuration body 23. However, the present invention is not limited to this, and one to three or five or more relays are provided. May be implemented.

  (10) In the present embodiment, the terminal fitting 25 attached to the common electrical component connector 9 is soldered to the circuit 20 of the circuit board 13 in the soldering portion 27, but the present invention is not limited thereto. The circuit 20 may be welded or crimped. Alternatively, the terminal fitting 25 may have a substantially L shape when viewed from the side, and the tip end portion thereof penetrates the circuit board 13 and is soldered to the circuit 20 formed on the circuit board 13.

  (11) In this embodiment, the common circuit component 23 is mounted with relays 22A, 22B, 22C, and 22D for controlling the disconnection of the wiper motor and the headlight. However, the present invention is not limited to this. It is good also as a structure which mounts in the common circuit structural body 23 the switching element which carries out the interruption | blocking control of the electrical component or components arbitrarily selected from the product group.

  (12) The common electric junction box 4 and the individual electric junction box 5 may be configured such that the circuit boards 13 and 41 accommodated in the respective housings 10A and 10B are vertically arranged, or horizontally arranged. The circuit boards 13 and 41 can be arranged at an arbitrary angle.

  (13) In this embodiment, the relay box side connector for fitting with the individual electrical component connector and the common electrical component connector 9 is formed in the main housing 6 and is accommodated in the relay box side connector. The common electrical connection box 4, the individual electrical connection box 5, and the relay mounting portion 7 are electrically connected via the terminal fitting. At this time, for example, a conductive path is formed by a bus bar connected to a circuit formed in the relay mounting portion 7, and a common electrical connection is established by connecting the conductive path and a terminal fitting housed in the relay box side connector. It is good also as a structure which connects the box 4, the separate electrical connection box 5, and the relay mounting part 7 electrically. Moreover, it is good also as a structure which connects the relay mounting part 7 and the terminal metal fitting accommodated in the relay box side connector with a wire harness.

  (14) In addition, the common electrical component connector 9 of the common electrical connection box 4 and the individual electrical component connector of the individual electrical connection box 5 are connected by a conductive path or a wire harness formed by a bus bar. The connection box 5 is provided with a second individual electrical component connector for mating with the relay box side connector, and by fitting the relay box side connector with the second individual electrical component connector, The common electrical connection box 4, the individual electrical connection box 5, and the relay mounting portion 7 may be electrically connected.

The top view which shows the state in which the common electric junction box and individual electric junction box which concern on this embodiment were installed in the engine room The perspective view of the common electric junction box concerning this embodiment The perspective view of the common electric junction box concerning this embodiment Plan sectional view of the common electrical junction box according to the present embodiment AA line sectional view in FIG. BB sectional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Automobile 4 ... Common electric junction box 5 ... Individual electric junction box 6 ... Main housing 10A, 10B ... Housing 13 ... Circuit board 19 ... Metal board 21 ... Metal base printed wiring board 22A, 22B, 22C, 22D ... Relay (switching element)
23 ... Common circuit structure 28 ... Connection part (terminal group)
DESCRIPTION OF SYMBOLS 40 ... Relay 41 ... Circuit board 42 ... Individual circuit structure 43 ... Relay (switching element)

Claims (6)

An electrical component control system for controlling electrical disconnection of automobile electrical components,
The electrical components are divided into individual electrical component groups that are used only in the same vehicle type, and common electrical component groups that are also used in other vehicle types,
The electrical component control system, wherein the individual electrical component group and the common electrical component group are each configured to be controlled to be interrupted by a switching element group mounted on separate circuit boards. An electrical junction box for controlling electrical disconnection of automobile electrical components,
An individual circuit component in which a switching element for controlling an individual electrical component group used only in the same vehicle type is mounted on a circuit board, and a switching element for controlling a common electrical component group used also in another vehicle type An electrical connection box comprising a common circuit component mounted on a circuit board different from the circuit board. The common circuit component and the individual circuit component are housed in different housings,
The electrical connection box according to claim 2, wherein a terminal group connected to a switching element of the common circuit constituent is protruded from the housing of the common circuit constituent. Each housing that houses the common circuit structure and the individual circuit structure is housed in a main housing that includes them, and is controlled by the common circuit structure and / or the individual circuit structure in the main housing. The electrical connection box according to claim 3, wherein a relay to be operated is arranged. 5. The electrical junction box according to claim 2, wherein the common circuit component is configured by a metal base printed wiring board in which a circuit is formed on a metal substrate via an insulating layer. 6. The electrical junction box according to claim 5, wherein the metal base printed wiring board constitutes a part of an outer surface of the housing.

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