circuit body

Abstract

Disclosed is a circuit body that, when a blocking section is installed on a pair of busbars and a conductor pattern of a printed board mounted on the busbars, enables suppression of tilting of the blocking section.　The circuit body is provided with: a pair of busbars 12, 14 that form an energization route between two conductive paths; a printed board 24 which is mounted on at least one of surfaces 16, 18 of the pair of busbars 12, 14 and in which a conductor pattern 21, connected to a control circuit, is exposed to a board surface 22; and a blocking section 32 that includes a pair of power terminals 26, 28 installed respectively on the surfaces 16, 18 of the pair of busbars 12, 14 and a control terminal 30 installed on the conductor pattern 21, and that performs conduction and blocking of electricity between the pair of busbars 12, 14. At least one of the pair of power terminals 26, 28 has a mounting section 80 that is mounted on the board surface 22 of the printed board 24.

Description

Technical Field

[0001] The present disclosure relates to a circuit body.

Background Art

[0002] Conventionally, vehicles such as electric vehicles and hybrid vehicles have been equipped with an electrical connection box that is disposed between a high-voltage battery and a high-voltage load and conducts or interrupts power. For example, Patent Document 1 discloses an electrical connection box including a pair of bus bars that constitute an energization path between a power source and a load, and a cutoff portion constituted by a power semiconductor that is mounted on the pair of bus bars and conducts and interrupts power between the bus bars.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the structure of Patent Document 1, a pair of power terminals (drain terminal and source terminal) of the cutoff portion are respectively mounted on a pair of bus bars, and a control terminal (gate terminal) of the cutoff portion is mounted on a conductor pattern of a flexible printed board placed on the bus bar. Therefore, due to the difference in the height positions of the control terminal and the pair of power terminals during mounting, the cutoff portion is mounted obliquely, and there is a risk of connection failure due to displacement of the control terminal from the conductor pattern.

[0005] Therefore, a circuit body is disclosed that can suppress the inclination of the cutoff portion when the cutoff portion is mounted on a pair of bus bars and a conductor pattern of a printed board placed on the bus bar.

Means for Solving the Problems

[0006] The circuit body of the present disclosure comprises a pair of busbars that constitute a current-carrying path between two conductive paths; a printed circuit board mounted on at least one of the surfaces of the pair of busbars and having a conductor pattern connected to a control circuit exposed on the substrate surface; a pair of power terminals mounted on the surfaces of the pair of busbars, respectively; and a circuit breaker that performs current supply and interruption between the pair of busbars, and has a mounting portion mounted on the conductor pattern. At least one of the pair of power terminals has a mounting portion that is mounted on the substrate surface of the printed circuit board.

[0007] A circuit body according to another aspect of the present disclosure comprises a pair of busbars constituting a current-carrying path between two conductive paths; a printed circuit board mounted on at least one of the surfaces of the pair of busbars, with a conductor pattern connected to a control circuit exposed on the substrate surface; and a circuit breaker that performs current supply and interruption between the pair of busbars, the circuit breaker comprising a pair of power terminals mounted on the surfaces of the pair of busbars, and control terminals mounted on the conductor pattern, wherein the housing portion of the main body of the circuit breaker constitutes a mounting portion that is mounted on the substrate surface of the printed circuit board. [Effects of the Invention]

[0008] According to the circuit body of this disclosure, the inclination of the interruption portion can be suppressed when the interruption portion is mounted on a pair of busbars and a conductor pattern of a printed circuit board placed on the busbars. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view showing the circuit assembly according to Embodiment 1 with a portion of the case transparent. [Figure 2] Figure 2 is a partially exploded perspective view showing a portion of the circuit shown in Figure 1 in an disassembled state. [Figure 3] Figure 3 is a perspective view showing the main components of the circuit shown in Figure 1, magnified and with the control board visible. [Figure 4] Figure 4 is a plan view of the main part of the circuit shown in Figure 3. [Figure 5] Figure 5 is a perspective view showing a further enlarged view of the main components of the circuit shown in Figure 3. [Figure 6] Figure 6 is a perspective view showing the circuit breaker portion that constitutes the circuit shown in Figure 1, with the main body visible through it. [Figure 7] Figure 7 is an enlarged perspective view showing the main part of the circuit body according to Embodiment 2, and corresponds to Figure 5. [Figure 8] Figure 8 is a perspective view showing an enlarged view of the main part of the circuit body according to Embodiment 3, and corresponds to Figure 3. [Figure 9] Figure 9 is a perspective view showing a further enlarged view of the main part of the circuit shown in Figure 8, and corresponds to Figure 5. [Figure 10] Figure 10 is an enlarged perspective view showing the main part of the circuit body according to Embodiment 4, and corresponds to Figure 5. [Modes for carrying out the invention]

[0010] <Description of Embodiments in this Disclosure> First, embodiments of this disclosure will be listed and described. The circuit body of this disclosure is (1) A printed circuit board comprising: a pair of busbars constituting a current-carrying path between two conductive paths; a printed circuit board mounted on at least one of the surfaces of the pair of busbars, with a conductor pattern connected to a control circuit exposed on the substrate surface; a pair of power terminals mounted on the surfaces of the pair of busbars, and a control terminal mounted on the conductor pattern, which performs current supply and interruption between the pair of busbars, wherein at least one of the pair of power terminals has a mounting portion mounted on the substrate surface of the printed circuit board.

[0011] According to the circuit of this disclosure, a pair of power terminals of the interruption unit are mounted on the surface of a pair of busbars, and the control terminal of the interruption unit is mounted on a conductor pattern exposed on the surface of a printed circuit board, which is located above the pair of busbars and placed on at least one of the surfaces of the pair of busbars. Thereafter, at least one of the pair of power terminals has a mounting portion that is placed on the substrate surface of the printed circuit board. This makes it possible to suppress the tilt of the interruption unit when it is mounted on the pair of busbars and conductor pattern, which is caused by the difference in height between the surfaces of the conductor pattern and the pair of busbars, compared to the case where only the control terminal is mounted on the printed circuit board. In other words, in the conventional structure, the number of terminals mounted on the busbars at a lower height is greater than the number of terminals mounted on the conductor pattern at a higher height, so the interruption unit tends to be pulled towards the busbars during mounting, and there is a risk that the interruption unit will tilt so that the control terminal side is lifted up. In this disclosure, at least one of the pair of power terminals has a mounting portion that is placed on the substrate surface of the printed circuit board, which is at a higher height than the pair of busbars. Therefore, by increasing the area held at the height of the printed circuit board during mounting, the inclination of the interlocking portion during mounting can be suppressed compared to conventional structures.

[0012] The mounting section only needs to be provided on at least one of the pair of power terminals, and can be provided in any location and shape as appropriate, depending on the routing of the busbars and conductors.

[0013] (2) In (1) above, it is preferable that one of the pair of power terminals is connected to one of the pair of busbars connected to one of the two conductive paths, and the other of the pair of power terminals is connected to the other of the pair of busbars connected to the other of the two conductive paths, and that the other power terminal is configured to include a plurality of terminal fittings, at least one of the terminal fittings constitutes the above-mentioned mounting portion placed on the surface of the substrate, and the other terminal fittings are mounted on the other of the pair of busbars.

[0014] In some cases, the blocking part composed of a power semiconductor or the like constitutes the other power terminal such as a source terminal mounted on the other bus bar connected to the other of the two conductive paths by a plurality of terminal fittings such as a gull-wing shape. In this case, at least one of the plurality of terminal fittings can be advantageously configured as a mounting portion to be placed on the substrate surface of the printed circuit board. In particular, when the energizing current to the pair of bus bars is large, the conduction resistance is reduced by securing a conduction path using a plurality of terminal fittings. By utilizing the existing structure of such a blocking part, it is possible to easily provide the mounting portion without changing the design of the blocking part.

[0015] (3) In the above (2), it is preferable that at least one of the terminal fittings constituting the mounting portion is connected to the conductor pattern. By further connecting at least one terminal fitting used for the mounting portion to the conductor pattern of the printed circuit board, potential information of the blocking part and the like can be sent to an external control circuit and used as vehicle control information. Therefore, further utility value can be added to the mounting portion.

[0016] (4) In the above (2) or (3), it is preferable that at least one of the terminal fittings constituting the mounting portion is not connected to the conductor pattern. Since at least one terminal fitting used for the mounting portion is a so-called dummy terminal that is not connected to the conductor pattern of the printed circuit board, when selecting at least one terminal fitting to be used as the mounting portion, there is no restriction on the wiring portion of the conductor pattern. Therefore, there is an advantage that a terminal fitting arranged at a position that more corrects the inclination of the blocking part during mounting can be advantageously selected. For example, by selecting a terminal fitting provided at the position farthest from the control terminal as the mounting portion, the inclination of the blocking part during mounting can be more advantageously suppressed.

[0017] (5) In any one of (2) to (4) above, a plurality of the terminal fittings are arranged in parallel alongside the control terminal, and the mounting portion is configured to include the terminal fitting that is farthest from the control terminal in the parallel direction. By configuring the mounting portion to include the terminal fitting that is farthest from the control terminal among the terminal fittings arranged in parallel alongside the control terminal, it is possible to more reliably suppress the inclination of the cutoff portion during mounting.

[0018] (6) In any one of (2) to (5) above, the printed circuit board is mounted on the other surface of the pair of busbars, and through a through-hole provided in the printed circuit board, the other surface of the pair of busbars is partially exposed. Around the through-hole in the printed circuit board, the control terminal mounted on the conductor pattern and at least one of the terminal fittings constituting the mounting portion are mounted, and the other terminal fittings are mounted on the surface exposed through the through-hole. It is preferable that By providing a through-hole in the printed circuit board to expose the surface of the other busbar, it is possible to mount the terminal fittings on the other busbar near the conductor pattern and mount the terminal fittings constituting the mounting portion on the surface of the substrate, and the configuration of the present disclosure can be realized while suppressing an increase in size.

[0019] (7) In any one of (1) to (6) above, one of the pair of power terminals is connected to one of the pair of busbars connected to one of the two conductive paths, and the other of the pair of power terminals is connected to the other of the pair of busbars connected to the other of the two conductive paths. One of the power terminals is configured to include a flat terminal fitting, a part of the flat terminal fitting constitutes the mounting portion mounted on the substrate surface, and the other part of the flat terminal fitting is mounted on one of the pair of busbars. It is preferable that

[0020] In some cases, a power circuit breaker, composed of power semiconductors and the like, may have one power terminal, such as a drain terminal mounted on one of the busbars connected to one of the two conductive paths, configured with a flat terminal fitting. In this case, by extending a portion of the flat terminal fitting towards the printed circuit board, and / or by extending the printed circuit board towards the flat terminal fitting, the mounting portion that sits on the surface of the printed circuit board can be configured advantageously. In particular, the flat terminal fitting is often located on the underside of the case of the circuit breaker, and by cleverly utilizing the dead space on the underside of the case, it is possible to easily and efficiently provide the mounting portion by simply extending a portion of the flat terminal fitting towards the printed circuit board, or by extending the printed circuit board towards the flat terminal fitting.

[0021] A circuit body relating to another aspect of this disclosure is: (8) A circuit breaker comprising a pair of busbars that constitute a current-carrying path between two conductive paths, a printed circuit board mounted on at least one of the surfaces of the pair of busbars and having a conductor pattern connected to a control circuit exposed on the substrate surface, and a circuit breaker that performs current supply and interruption between the pair of busbars, the housing portion of the main body of the circuit breaker forming a mounting portion that is mounted on the substrate surface of the printed circuit board.

[0022] According to the circuit body of this embodiment, the housing portion of the main body of the interruption unit constitutes a mounting portion that is placed on the surface of the printed circuit board. Therefore, similar to embodiment (1) above, the area held at the height position of the printed circuit board during mounting is increased, thereby suppressing the tilt of the interruption unit during mounting compared to the conventional structure.

[0023] <Details of the embodiments of this disclosure> Specific examples of the circuits of this disclosure will be described below with reference to the drawings. However, this disclosure is not limited to these examples, and all modifications are intended to be included in the meaning and scope equivalent to the claims, as indicated by the claims.

[0024] <Embodiment 1> The electrical junction box 10 of Embodiment 1 of this disclosure will be described below with reference to Figures 1 to 6. The electrical junction box 10 is an example of a circuit body. This electrical junction box 10 is placed between two conductive paths, a high-voltage battery and a high-voltage load, in a vehicle such as an electric vehicle or a hybrid vehicle, and controls the conduction or interruption of current between them. The electrical junction box 10 can be placed in any orientation, but in the following description, the up and down, front and back, and left and right directions refer to the up and down, front and back, and left and right directions shown in Figure 1, respectively. In addition, for multiple identical components, reference numerals may be assigned to only some of the components, while the reference numerals for other components may be omitted.

[0025] <Electrical junction box 10> The electrical junction box 10 includes a pair of busbars (drain-side busbar 12 and source-side busbar 14) arranged at approximately the same height to form a current flow path between a power source (e.g., a high-voltage battery) as one of two conductive paths (not shown) and a load (e.g., a high-voltage load) as the other of the two conductive paths. The electrical junction box 10 also includes a flexible printed circuit board (FPC) 24 as a printed circuit board, which is mounted on at least one of the surfaces (drain-side surface 16 and source-side surface 18) of the pair of busbars (drain-side busbar 12 and source-side busbar 14) and has a conductor pattern 21 (shown as a dashed line in Figure 5) exposed on the substrate surface 22, which is connected to a control circuit (not shown) provided on the control board 20. Furthermore, the electrical junction box 10 includes a pair of power terminals (drain terminal 26 and source terminal 28) mounted on the surfaces (drain surface 16 and source surface 18) of a pair of busbars (drain busbar 12 and source busbar 14), respectively, and a control terminal 30 mounted on the conductor pattern 21, and a break-off unit 32 that controls and interrupts current between the pair of busbars (drain busbar 12 and source busbar 14).

[0026] In Embodiment 1, a case 34 is provided to house a pair of busbars (drain-side busbar 12 and source-side busbar 14), a control board 20, an FPC 24, and a shutoff unit 32. In particular, in Embodiment 1, the case 34 is composed of an upper case 36 and a lower case 38. In Embodiment 1, a drain-side end busbar 40 is connected to the drain-side busbar 12, and a source-side end busbar 42 is connected to the source-side busbar 14. The end of the drain-side end busbar 40 opposite to the side connected to the drain-side busbar 12 protrudes to the outside of the case 34 as a drain-side external connection part 44. Furthermore, the end of the source-side end busbar 42 opposite to the side connected to the source-side busbar 14 protrudes to the outside of the case 34 as a source-side external connection part 46. Through holes 47 are provided in the drain-side and source-side external connection parts 44 and 46, respectively, penetrating in the thickness direction.

[0027] <Drain-side busbar 12> The drain-side busbar 12, as one of a pair of busbars, is a generally E-shaped metal plate and is made of a metal with excellent conductive properties, such as copper (including copper alloys) or aluminum (including aluminum alloys). In Embodiment 1, as shown in Figure 4, the E-shaped opening of the drain-side busbar 12 is positioned to face forward. That is, a connecting portion 48 extending in the left-right direction is provided at the rear of the drain-side busbar 12, and drain-side connecting portions 50 to which the aforementioned drain terminals 26 are connected extend forward from both left-right ends and the left-right center of the connecting portion 48.

[0028] In short, the drain-side busbar 12 is provided with drain-side connection portions 50 extending in the front-to-back direction at both ends in the left-to-right direction and in the center in the left-to-right direction, and the rear ends of each drain-side connection portion 50 are connected by connecting portions 48. Furthermore, a front opening 52 is formed between the drain-side connection portions 50 at both ends in the left-to-right direction and in the center in the left-to-right direction of the drain-side busbar 12. The aforementioned drain-side end busbar 40 is fixed to the connecting portion 48 of the drain-side busbar 12, for example, by welding. The drain-side external connection portion 44 of the drain-side end busbar 40 is connected to power supply wires, busbars, etc. (not shown) using or without using through holes 47.

[0029] <Source busbar 14> The source busbar 14, as the other of a pair of busbars, is a generally U-shaped metal plate and is made of a metal with excellent conductive properties, such as copper (including copper alloys) or aluminum (including aluminum alloys). In Embodiment 1, as shown in Figure 4, the U-shaped opening of the source busbar 14 is positioned to face rearward. That is, a connecting portion 54 extending in the left-right direction is provided in front of the source busbar 14, and source-side connecting portions 56 to which the aforementioned source terminals 28 are connected extend rearward from both left-right ends of the connecting portion 54.

[0030] In short, the source-side busbar 14 is provided with source-side connection parts 56 extending in the front-rear direction at both left-right ends, and the front ends of each source-side connection part 56 are connected by connecting parts 54. In addition, a rear opening 58 opening toward the rear is formed in the center of the source-side busbar 14 in the left-right direction. The aforementioned source-side end busbar 42 is fixed to the connecting part 54 of the source-side busbar 14, for example, by welding. The source-side external connection part 46 of the source-side end busbar 42 is connected to load-side wires, busbars, etc. (not shown) using or without using through holes 47.

[0031] The drain-side busbar 12 and the source-side busbar 14 have approximately equal thickness dimensions, and when fixed on the adhesive sheet 60 and bottom plate 62 described later, the height positions (vertical positions) of the drain-side surface 16 and the source-side surface 18 are approximately equal.

[0032] These drain-side busbars 12 and source-side busbars 14 are bonded to a metal bottom plate 62 via, for example, a roughly rectangular adhesive sheet 60. On the adhesive sheet 60, the drain-side busbars 12 and source-side busbars 14 are positioned facing each other in the front-to-back direction, with the source-side busbars 14 located in front of the adhesive sheet 60 and the drain-side busbars 12 located behind the adhesive sheet 60. The drain-side connection portion 50 in the left-to-right center of the drain-side busbars 12 is located within the rear opening 58 of the source-side busbars 14. The source-side connection portions 56 at both left-to-right ends of the source-side busbars 14 are located within each front opening 52 of the drain-side busbars 12. As a result, in the middle section of the adhesive sheet 60 in the front-to-back direction, each drain-side connection portion 50 and each source-side connection portion 56 are alternately provided in the left-to-right direction. Each of these drain-side connection portions 50 and each source-side connection portion 56 faces each other at a predetermined distance in the left-to-right direction.

[0033] The adhesive sheet 60 preferably has insulating and thermal conductivity, and for example, a conventionally known thermal conductive sheet can be used. The material of the adhesive sheet 60 can be, for example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polytetrafluoroethylene (PTFE), polycarbonate (PC), polyimide (PI), etc. That is, the adhesive sheet 60 is made of a synthetic resin that has a higher thermal conductivity than air, for example. Specifically, silicone-based resins, non-silicone acrylic resins, ceramic resins, etc. can be used. More specifically, examples include heat dissipation gap fillers, thermal conductive greases, and thermal conductive silicone rubber made of silicone-based resins. In Embodiment 1, the adhesive sheet 60 is in the form of a sheet, but it is not limited to this and any shape can be used.

[0034] Furthermore, the bottom plate 62 is formed to cover the lower opening 92 of the lower case 38, which will be described later, and is fixed to the lower case 38 by screws 64. By making the bottom plate 62 out of metal, the heat generated in the shutoff section 32, etc., can be dissipated through the drain-side and source-side busbars 12, 14, the adhesive sheet 60, and the bottom plate 62, for example, through a metal housing (not shown) on which the electrical connection box 10 is placed. If the bottom plate 62 is made of synthetic resin, the adhesive sheet 60 may not be provided, and the drain-side and source-side busbars 12, 14 and the bottom plate 62 can be fixed together by conventionally known fixing methods, such as bolt fixing.

[0035] <Printed circuit board (FPC24)> An FPC 24, which is a printed circuit board, is placed on the surface (source side surface 18) of the source side busbar 14, which is the other of the pair of busbars. A conductor pattern 21 is printed on the substrate surface 22 of the FPC 24, and this conductor pattern 21 is exposed on the substrate surface 22.

[0036] In Embodiment 1, a pair of FPCs 24, 24 are provided, and each FPC 24 is substantially strip-shaped. One end of each FPC 24 in the longitudinal direction is placed on each source-side connection portion 56 of the source-side busbar 14 and fixed by adhesive or the like. In Embodiment 1, one end of each FPC 24 in the longitudinal direction is overlapped and fixed over substantially the entire surface of each source-side connection portion 56. In the portion of each FPC 24 that overlaps with each source-side connection portion 56 at one end of the longitudinal direction, a substantially rectangular through hole 66 is formed, corresponding to the position of the source terminal 28 in the interruption portion 32. In Embodiment 1, as will be described later, multiple interruption portions 32 are provided, so multiple through holes 66 are formed in each FPC 24, and the source-side surface 18 of the source-side busbar 14 is partially exposed through these through holes 66.

[0037] Furthermore, a folded portion 68 is provided in the middle of the length of each FPC 24, and the other end in the length direction of each FPC 24 is folded upward relative to one end in the length direction of each FPC 24 that is placed on each source-side connection portion 56. A control board 20, for example, on which a control circuit (not shown) is printed, is fixed to the other end in the length direction of each FPC 24, and the conductor pattern 21 on each FPC 24 and the control circuit on the control board 20 are electrically connected. A connector 70 is also mounted on the control board 20, and the control circuit on the control board 20 and the connector 70 are electrically connected. When the electrical connection box 10 is assembled, the connector 70 is exposed to the outside through an opening 72 provided in the case 34. When an external device (not shown) is connected to the connector 70, signals from the external device are transmitted to the disconnection portion 32 through the control circuit on the control board 20 and the conductor pattern 21 on each FPC 24.

[0038] <Blocking section 32> A disconnection unit 32 is connected to the drain-side connection part 50 of the drain-side busbar 12 and the source-side connection part 56 of the source-side busbar 14, which controls the conduction and interruption of current between the drain-side busbar 12 and the source-side busbar 14. In Embodiment 1, the disconnection unit 32 is a power semiconductor, a power MOSFET (Met a It is defined as an l-Oxide-Semiconductor Field-Effect Transistor. In Embodiment 1, a plurality of interruption sections 32 are provided spanning the drain-side connection section 50 and the source-side connection section 56, which are separated by a predetermined distance in the left-right direction and face each other, and these plurality of interruption sections 32 are arranged in parallel in the front-back direction and the left-right direction.

[0039] Each interruption unit 32, as shown in Figure 6, is equipped with a drain terminal 26 and a source terminal 28, which are a pair of power terminals, and a control terminal 30. These drain terminal 26, source terminal 28, and control terminal 30 are provided protruding outward from the roughly rectangular block-shaped main body 74 that constitutes the interruption unit 32. Since conventionally known power MOSFETs can be used as each interruption unit 32, a detailed description of the structure of the main body 74 is omitted. In Figure 6, the main body 74 is shown transparently for clarity.

[0040] In each circuit breaker 32, one of the power terminals, the drain terminal 26, is composed of a roughly plate-shaped flat terminal fitting 75. This drain terminal 26 (flat terminal fitting 75) constitutes a large area on the bottom surface (lower surface) of the main body 74 and protrudes outward from the main body 74 (for example, in the direction of the arrow pointing to the right in each circuit breaker 32 shown in Figure 6).

[0041] Furthermore, in Embodiment 1, the source terminal 28, which is the other power terminal in each circuit breaker 32, is composed of a plurality of terminal fittings 76. The plurality of terminal fittings 76 that constitute this source terminal 28 protrude outward from the main body 74 on the opposite side from the drain terminal 26 (for example, in the direction of the arrow indicating left in each circuit breaker 32 shown in Figure 6), and these plurality of terminal fittings 76 are provided in parallel. For example, in Figure 6, six terminal fittings 76 are provided in a line in the direction of the arrow indicating front and back. The shape of each terminal fitting 76 is not limited, but in Embodiment 1, each terminal fitting 76 is gull-wing shaped, bending in a roughly L-shape, and a vertical portion 78 extending vertically is provided in the middle of the length of each terminal fitting 76. That is, each terminal fitting 76 protrudes outward from the middle of the main body 74 in the vertical direction, passes through the vertical portion 78 extending vertically, and at the protruding tip, extends in the same direction as the protrusion direction from the main body 74 (in the direction of the arrow indicating left in each circuit breaker 32 shown in Figure 6).

[0042] Furthermore, the control terminals 30 in the interruption section 32 are provided in parallel with each terminal fitting 76 that constitutes the source terminal 28. For example, in Figure 6, they are provided behind each terminal fitting 76 in each interruption section 32. The shape of the control terminals 30 is not limited, but in Embodiment 1, they have the same shape as each terminal fitting 76 that constitutes the source terminal 28, and a vertical portion 78 extending vertically is provided in the middle of the length. As a result, the control terminals 30, like each terminal fitting 76, protrude outward from the middle of the main body 74 in the vertical direction, pass through the vertical portion 78 that extends vertically, and at the protruding tip, extend in the same direction as the protrusion from the main body 74.

[0043] Each of the cutoff sections 32, which are shaped in this way, has its drain terminal 26 mounted on the surface (drain-side surface 16) of each drain-side connection section 50 in the drain-side busbar 12. Specifically, the bottom surface (lower surface) of each drain terminal 26 and the drain-side surface 16 of each drain-side connection section 50 are superimposed and electrically connected via solder (not shown).

[0044] Furthermore, the bottom surfaces (lower surfaces) of each control terminal 30 in each interruption section 32 are superimposed on the FPC 24 on each source-side connection section 56 of the source-side busbar 14. Through holes 66 are provided in the FPC 24 on each source-side connection section 56 at positions corresponding to the source terminals 28 (each terminal fitting 76), exposing the source-side surface 18 of the source-side busbar 14. The bottom surfaces (lower surfaces) of each terminal fitting 76 in each interruption section 32 are inserted through the through holes 66 and superimposed on the source-side surface 18 of each source-side connection section 56, and are electrically connected via solder (not shown).

[0045] In Embodiment 1, as shown in Figure 5 and other figures, five of the six terminal fittings 76a that are not adjacent to the control terminal 30 are connected to the source-side connection parts 56 through the through-holes 66 in the FPC 24. The remaining terminal fitting 76b adjacent to the control terminal 30 is placed on the FPC 24 without being connected to the source-side connection part 56. In other words, in Embodiment 1, the terminal fittings 76b adjacent to the control terminal 30 constitute a mounting part 80 that is placed on the substrate surface 22 of the printed circuit board (FPC 24). In addition, the terminal fittings 76a that are not adjacent to the control terminal 30 (each terminal fitting 76a other than the terminal fittings 76b that constitute the mounting part 80) are mounted on the source-side busbar 14, which is the other of a pair of busbars.

[0046] Furthermore, each control terminal 30 in each interruption section 32 is superimposed on the FPC 24 on each source-side connection section 56 and electrically connected to the conductor pattern 21 exposed on the substrate surface 22 of the FPC 24, for example, via solder (not shown). Also, the terminal fittings 76b, which are placed on the substrate surface 22 of the FPC 24 and constitute the mounting section 80, similar to each control terminal 30, are not connected to the conductor pattern 21 of the FPC 24 and are so-called dummy terminals. Therefore, in Embodiment 1, the control terminals 30 mounted on the conductor pattern 21 and the terminal fittings 76b constituting the mounting section 80 are placed on the substrate surface 22 of the FPC 24 around the through-hole 66 of the FPC 24. In addition, the other terminal fittings 76a are mounted on the source-side surface 18 exposed through the through-hole 66.

[0047] <Case 34> The specific shape of case 34 is not limited, but in Embodiment 1, case 34 as a whole has a substantially rectangular box shape, and as described above, case 34 is composed of an upper case 36 and a lower case 38. Case 34 (upper case 36 and lower case 38) can be made of, for example, synthetic resin.

[0048] The upper case 36 is a roughly flat plate shape or a box shape opening downwards, with a roughly rectangular upper bottom wall 82 as a whole. The lower case 38 is a roughly rectangular cylindrical shape with an annular peripheral wall 84 as a whole. Busbar support portions 86 are provided on both sides of the inner surface of the peripheral wall 84 in the front-rear direction. The outwardly extending portions of the drain-side end busbar 40 and the source-side end busbar 42 are placed on these busbar support portions 86, and the drain-side external connection portion 44 and the source-side external connection portion 46 protrude outward from the case 34 in the front-rear direction.

[0049] Furthermore, substrate support portions 88 are provided on both the left and right sides of the inner circumferential surface of the peripheral wall 84. These substrate support portions 88 are provided at two locations on the left and right sides, separated in the front-to-back direction. The control board 20, connected to the ends of each FPC 24 that are folded upward by each folded portion 68, is placed and supported on each substrate support portion 88 at four locations on the outer periphery. As a result, the control board 20 is positioned above and separated from the respective blocking portions 32 located below it, without coming into contact with them.

[0050] Then, the upper opening 90 of the lower case 38 is covered by the upper case 36, and the lower case 38 and the upper case 36 are fixed together in an appropriate manner. Furthermore, as described above, the bottom plate 62 to which the drain-side and source-side busbars 12, 14, each FPC 24, each shut-off section 32, etc. are attached is superimposed over the lower opening 92 of the lower case 38 and fixed with screws 64. This constitutes the case 34.

[0051] <Assembly process for electrical junction box 10> Next, a specific example of the assembly process for the electrical junction box 10 will be described. Note that the assembly process for the electrical junction box 10 is not limited to the description below.

[0052] First, the drain-side and source-side busbars 12 and 14 are fixed to the bottom plate 62 via adhesive sheets 60. Then, each FPC 24, each with a through hole 66, is placed on top of each source-side connection portion 56 of the source-side busbar 14 and fixed in place with adhesive, for example. Next, each disconnection portion 32 is positioned to span across each drain-side connection portion 50 of the drain-side busbar 12 and each source-side connection portion 56 of the source-side busbar 14 (i.e., each FPC 24 on top of them). This causes each drain terminal 26 of each disconnection portion 32 to overlap with each drain-side connection portion 50.

[0053] Furthermore, each terminal fitting 76a that is not adjacent to the control terminal 30 (and does not constitute the mounting portion 80) among the terminal fittings 76 that constitute each source terminal 28 in each interruption section 32 is superimposed on the source-side surface 18 of each source-side connection section 56 through each through-hole 66 in each FPC 24. In addition, the control terminal 30 and the terminal fitting 76b adjacent to the control terminal 30 in each interruption section 32 are superimposed on the substrate surface 22 of each FPC 24. In particular, the control terminal 30 is superimposed on the conductor pattern 21 exposed on the substrate surface 22 of each FPC 24.

[0054] Then, the overlapping points, namely each drain terminal 26 and each drain-side connection part 50, each terminal fitting 76a constituting each source terminal 28 and each source-side connection part 56, and the control terminal 30 and the conductor pattern 21 are soldered together to create electrical conductivity and mount the components. Conventional soldering methods such as reflow soldering can be employed.

[0055] Subsequently, the bottom plate 62, to which the drain-side and source-side busbars 12, 14, each FPC 24, and each shut-off section 32 are attached as described above, is fixed with screws 64 so as to cover the lower opening 92 of the lower case 38. Next, the drain-side and source-side end busbars 40, 42 are inserted through the upper opening 90 of the lower case 38 and placed on the respective busbar support sections 86. The lower ends of the drain-side and source-side end busbars 40, 42 are also fixed to the respective connecting sections 48, 54 of the drain-side and source-side busbars 12, 14.

[0056] Next, each FPC 24 is folded upward at each folded portion 68, and the control board 20, on which the connector 70 is pre-mounted, is fixed to the ends of each folded FPC 24, thereby electrically connecting the conductor patterns 21 on each FPC 24 to the control circuit on the control board 20. Then, this control board 20 is placed on each board support portion 88 of the lower case 38. Finally, the upper opening 90 of the lower case 38 is covered with the upper case 36, and the upper case 36 and the lower case 38 are fixed in an appropriate manner to complete the electrical connection box 10.

[0057] As described above, when the electrical connection box 10 is connected, for example, to an external device via a connector 70, and a power interruption signal is transmitted from the outside, this interruption signal is transmitted to the control terminal 30 of each interruption unit 32 via the control circuit on the control board 20 and the conductor patterns 21 on each FPC 24. Then, when an interruption voltage based on the interruption signal is applied to the control terminal 30, the power supply path is interrupted at each interruption unit 32, and the electrical connection between the drain-side busbar 12 and the source-side busbar 14 is disconnected. The control board 20 may also be equipped with a microcomputer that outputs an interruption signal, and in response to an interruption command input from the outside via the connector 70, the microcomputer may output an interruption signal and transmit it to each interruption unit 32.

[0058] In the electrical connection box 10 of Embodiment 1, one of the multiple terminal fittings 76b constituting the source terminal 28 forms a mounting portion 80 that is placed on the substrate surface 22 of the printed circuit board (FPC 24). This suppresses the tilting of the interruption portion 32 when it is mounted on the drain-side busbar 12, the source-side busbar 14 and the conductor pattern 21, due to the difference in height positions of the surfaces of the conductor pattern 21, the drain-side busbar 12 and the source-side busbar 14. Therefore, in each interruption portion 32, it is possible to avoid or suppress tilting such that the remaining terminal fittings 76a that are not placed on the substrate surface 22 of the FPC 24 sink towards the source-side busbar 14 (and the control terminal 30 side floats up). As a result, problems of connection failure due to tilting of each interruption portion 32 can also be avoided or suppressed.

[0059] The source terminal 28 is composed of multiple terminal fittings 76, one of which terminal fittings 76b constitutes a mounting portion 80 placed on the substrate surface 22, and the other terminal fittings 76a are mounted on the source-side busbar 14. In the case of high-voltage power semiconductors, a structure in which the power terminal is composed of multiple terminal fittings has been conventionally adopted, but by adopting a structure in which at least one of these multiple terminal fittings 76 is mounted on the substrate surface 22 of the FPC 24 as a mounting portion 80, the effect of suppressing the tilt of each interruption portion 32 as described above can be achieved. In other words, without changing the structure of each interruption portion 32, the above effect can be obtained by changing the shape of the FPC 24, which can be more easily modified in shape, while using, for example, power semiconductors available on the market.

[0060] In Embodiment 1, the terminal fittings 76b constituting the mounting portion 80 are not connected to the conductor pattern 21 and are so-called dummy terminals. In particular, in Embodiment 1, through holes 66 are formed in the FPC 24 at positions corresponding to each terminal fitting 76a that does not constitute the mounting portion 80, and each terminal fitting 76a is electrically connected to the source-side busbar 14 through the through holes 66. That is, by changing the formation position of the through holes 66, it is possible to easily select which of the terminal fittings 76 will be used as terminal fittings 76a that are electrically connected to the source-side busbar 14, or which will be used as terminal fittings 76b that constitute the mounting portion 80. The formation position of such through holes 66 can be appropriately set according to the conductor pattern 21 on the FPC 24, and the terminal fittings 76b constituting the mounting portion 80 can be easily selected and provided from among the multiple terminal fittings 76.

[0061] Furthermore, the control terminals 30 and terminal fittings 76b constituting the mounting portion 80 are placed on the substrate surface 22 of the FPC 24 around the through-hole 66 as described above, while the other terminal fittings 76a are mounted on the source-side surface 18 exposed through the through-hole 66. As a result, the tilt of each interruption portion 32 is suppressed by the control terminals 30 and mounting portion 80 placed around the through-hole 66, thereby effectively suppressing the tilt of each interruption portion 32 that would cause the terminal fittings 76a not constituting the mounting portion 80 to fall into the source-side busbar 14 side through the through-hole 66.

[0062] <Embodiment 2> Next, the electrical junction box 100 as a circuit body in Embodiment 2 of this disclosure will be described with reference to Figure 7. Figure 7 shows the main parts of the electrical junction box 100 of Embodiment 2, and the case 34 and other parts are omitted from the illustration. The basic structure of the electrical junction box 100 of Embodiment 2 is the same as that of Embodiment 1, however, in Embodiment 2, the position of the terminal fitting 76c that constitutes the mounting portion 80 is different from that of the multiple terminal fittings 76 that constitute the source terminal 28. In the following description, components or parts that are substantially the same as those in Embodiment 1 are denoted by the same reference numerals as in Embodiment 1 in the figures, and detailed explanations are omitted.

[0063] In Embodiment 1, among the multiple terminal fittings 76, the terminal fitting 76b adjacent to the control terminal 30 constituted the mounting portion 80. In Embodiment 2, however, among the multiple terminal fittings 76 arranged in parallel alongside the control terminal 30, the mounting portion 80 is formed by the terminal fitting 76c that is furthest from the control terminal 30 in the parallel direction (front-to-back direction). That is, in Embodiment 2, among the multiple terminal fittings 76, five terminal fittings 76d located between the control terminal 30 and the terminal fitting 76c that constitute the mounting portion 80 are mounted on the source-side busbar 14 through the through-hole 66. In particular, in Embodiment 2, the terminal fittings 76c that constitute the mounting portion 80 are connected to the conductor pattern 21 exposed on the FPC 24.

[0064] In the electrical connection box 100 of Embodiment 2, the mounting portion 80 is formed by one of the terminal fittings 76c that constitute the source terminal 28, so the same effects as in Embodiment 1 can be achieved. In particular, in Embodiment 2, since the mounting portion 80 is formed by the terminal fitting 76c that is furthest from the control terminal 30, each circuit breaker 32 is supported at three points that are separated from each other by a predetermined distance in the front-rear and left-right directions, and the risk of each circuit breaker 32 being mounted at an angle can be further reduced. In addition, since each circuit breaker 32 is supported by the control terminal 30 and the terminal fitting 76c on both the front-rear and left-right sides of the through-hole 66, it can be more reliably prevented from tilting so that each terminal fitting 76d located between them falls into the source-side busbar 14 side through each through-hole 66.

[0065] Furthermore, in Embodiment 2, the terminal fittings 76c constituting the mounting section 80 are connected to the conductor pattern 21 in the FPC 24. This makes it possible to transmit, for example, potential information obtained in each interruption section 32 to the outside through the conductor pattern 21, the control circuit in the control board 20, and the connector 70. As a result, further control using the potential information obtained in each interruption section 32 becomes possible.

[0066] <Embodiment 3> Next, the electrical junction box 110 as a circuit body in Embodiment 3 of this disclosure will be described with reference to Figures 8 and 9. Figures 8 and 9 show the main parts of the electrical junction box 110 in Embodiment 3, and the case 34 and other parts are omitted from the illustration. In Embodiment 3, each FPC 112 as a printed circuit board has a wide portion 114 in which the width dimension (left-right dimension) of the portion that overlaps with each source-side connection portion 56 of the source-side busbar 14 is increased. As a result, the wide portion 114 of each FPC 112 overlaps not only with each source-side connection portion 56, but also with each drain-side connection portion 50 of the drain-side busbar 12 that is facing each source-side connection portion 56 in the left-right direction.

[0067] Furthermore, in Embodiment 3, as also shown in Figure 9, a portion of the flat terminal fitting 75 constituting the drain terminal 26, which is one of the power terminals, is placed on the substrate surface 116 of the wide portion 114 of the FPC 112, forming a mounting portion 118 (see Figure 6 for the shape of the flat terminal fitting 75). The other portion of the flat terminal fitting 75 is located outward in the left-right direction from the wide portion 114 of the FPC 112 and is mounted on the drain-side busbar 12, which is one of the pair of busbars. In Embodiment 3, the arrangement of each terminal fitting 76 on the source terminal 28 side is the same as in Embodiment 1, for example. That is, a mounting portion 80 is formed by the terminal fitting 76b adjacent to the control terminal 30 and the mounting portion 80 is placed on the substrate surface 116 of the FPC 112, while the remaining terminal fittings 76a may be mounted on the source-side busbar 14 through the through-hole 66 of the FPC 112. In the third embodiment, for example, each blocking section 32 is provided with two mounting sections 80 and 118.

[0068] In the electrical connection box 110 of Embodiment 3, the control terminal 30 and one terminal fitting 76b (mounting portion 80) are mounted on the substrate surface 116 of the FPC 112, and a part of the flat terminal fitting 75 constituting the drain terminal 26 constitutes a mounting portion 118 and is mounted on the substrate surface 116 of the wide portion 114 of the FPC 112. In addition, the remaining part of the flat terminal fitting 75 is mounted on the drain-side surface 16. That is, in Embodiment 3, the main body portion 74 and the drain terminal 26 of each circuit breaker 32 are supported over substantially their entire surface, and in addition, the control terminal 30 and one terminal fitting 76b (mounting portion 80) are also supported, so the risk of each circuit breaker 32 being installed at an angle can be reduced. Note that when the mounting portion 118 is provided on the drain terminal 26 side in this way, a relatively wide area of ​​each circuit breaker 32 is supported, so the mounting portion 80 on the source terminal 28 side is not essential.

[0069] <Embodiment 4> Next, the electrical junction box 120 as a circuit body in Embodiment 4 of this disclosure will be described with reference to Figure 10. Figure 10 shows the main parts of the electrical junction box 120 of Embodiment 4, and the case 34 and other parts are omitted from the illustration. The basic structure of Embodiment 4 is the same as, for example, Embodiment 3 described above, and each FPC 112 as a printed circuit board has a wide portion 114 in which the width dimension (left-right dimension) of the portion that overlaps each source-side connection portion 56 is increased.

[0070] In Embodiment 4, each wide portion 114 is formed to be so small that it does not extend to each drain terminal 26. Unlike Embodiment 3, the drain terminal 26 is not placed on the substrate surface 116 of the wide portion 114, and a part of the housing that constitutes the main body portion 74 is placed on the substrate surface 116. Therefore, in Embodiment 4, the housing portion of the main body portion 74 of each circuit breaker 32 constitutes a mounting portion 122 that is placed on the substrate surface 116 of each FPC 112. Even in the electrical connection box 120 of Embodiment 4 with this structure, the same effects as in Embodiment 3 can be achieved, and the risk of each circuit breaker 32 being installed at an angle can be reduced.

[0071] <Variation> While Embodiments 1 to 4 have been described in detail above as specific examples of the present disclosure, the present disclosure is not limited by these specific descriptions. Modifications, improvements, etc., to the extent that they can achieve the objectives of the present disclosure are included in the present disclosure. For example, the following modifications of embodiments are also included in the technical scope of the present disclosure.

[0072] (1) The pair of power terminals in the circuit breaker are not limited in number or shape of terminal fittings that constitute them, and may be one or more, or they may be flat, straight, or bent in the middle of their length. Similarly, the shape of the control terminal is not limited, and may, for example, extend in a straight line from the main body of the circuit breaker.

[0073] (2) In the above embodiment, the drain terminal 26, source terminal 28, and control terminal 30 each protruded from the main body 74 of each circuit breaker 32 in either the left or right direction, but the embodiment is not limited to this. That is, at least one of the pair of power terminals (drain terminal, source terminal) and control terminal may also protrude from the main body of each circuit breaker in the front-to-back direction, instead of or in addition to the left-to-right direction.

[0074] (3) In the above embodiment, the control terminal 30 was provided outside the parallel direction (front-to-back direction) of each of the multiple terminal fittings 76 constituting the source terminal 28, but the embodiment is not limited to this. For example, multiple terminal fittings constituting the source terminal may be arranged on both sides of the control terminal.

[0075] (4) In the above embodiment, the mounting portion 80 was formed by one of the multiple terminal fittings 76b, 76c among the multiple terminal fittings 76 constituting the source terminal 28, but the embodiment is not limited to this. When the source terminal consists of multiple terminal fittings and the mounting portion is formed by these terminal fittings, the mounting portion may be formed by two or more of the multiple terminal fittings, or it may be formed by at least one terminal fitting. When the mounting portion is formed by two or more of the multiple terminal fittings, some of the terminal fittings constituting the mounting portion may be connected to the conductor pattern, or all of the multiple terminal fittings constituting the mounting portion may be connected to the conductor pattern, or they may not be connected to the conductor pattern.

[0076] (5) In the above embodiment, each of the multiple terminal fittings 76 constituting the source terminal 28, except for one terminal fitting 76b, 76c constituting the mounting portion 80, each terminal fitting 76a, 76d was mounted on the source-side busbar 14 through one through hole 66. However, the number and shape of the through holes are not limited. For example, multiple through holes may be formed corresponding to each of the multiple terminal fittings, or circular (including elliptical, oblong, etc.) through holes may be formed.

[0077] (6) In the above embodiment, the control board 20 was located inside the electrical connection boxes 10, 100, 110, and 120, but it may also be located outside the electrical connection boxes, as long as the conductive patterns on the printed circuit board and the control circuits on the control board are electrically connected.

[0078] (7) In the above embodiment, the printed circuit board was an FPC (flexible printed circuit board) 24, but it may also be a rigid circuit board, for example, and the conductor pattern provided on the rigid circuit board may be electrically connected to the control circuit of the control board provided inside or outside the electrical connection box.

[0079] (8) In the above embodiment 3, the FPC 112 was provided with a wide portion 114 to extend the FPC 112 to the drain terminal 26, but instead of that, or in addition, the drain terminal may be extended to the printed circuit board.

[0080] (9) In the above embodiment, a plurality of blocking units 32 were provided, but there may be only one blocking unit. Even if a plurality of blocking units are provided, it is sufficient if one of them has the structure according to the disclosure.

[0081] (10) The shape of the case 34 described in the above embodiment is merely an example, and the shape of the case is not limited in any way.

[0082] (11) In the above embodiment, electrical connection boxes 10, 100, 110, and 120 as circuit bodies were provided between the power supply and the load, but the embodiment is not limited to this, and the pair of busbars can be provided between two conductive paths to form a current flow path. [Explanation of Symbols]

[0083] 10. Electrical junction box (circuit body, embodiment 1) 12. Drain-side busbar (one of a pair of busbars) 14. Source busbar (the other of a pair of busbars) 16 Drain side surface 18 Source side surface 20 Control board 21 Conductor Pattern 22 Surface of the substrate 24 FPC (Printed Circuit Board) 26 Drain terminal (one of a pair of power terminals) 28 Source terminal (the other of the pair of power terminals) 30 Control terminals 32 Interruption section 34 cases 36 Upper Case 38 Lower Cases 40 Drain-side end busbar 42 Source-side end busbar 44 Drain-side external connection 46 Source-side external connection section 47 Through hole 48 Connecting part 50 Drain side connection 52 Front opening 54 Connecting part 56 Source side connection 58 Rear opening 60 Adhesive Sheets 62 Bottom plate 64 screws 66 Through holes 68 Turning section 70 connectors 72 Opening 74 Main body 75 Flat terminal fittings 76 Terminal fittings 76a, 76b Terminal fittings (Embodiments 1, 3) 76c, 76d Terminal fittings (Embodiment 2) 78 Vertical section 80 Mounting section 82 Upper bottom wall 84 Peripheral wall 86 Busbar support 88 Substrate support section 90 Upper opening 92 Lower opening 100 Electrical junction box (circuit body, embodiment 2) 110 Electrical junction box (circuit body, embodiment 3) 112 FPC (Printed Circuit Board) 114 Wide section 116 Substrate surface 118 Mounting section 120 Electrical junction box (circuit body, embodiment 4) 122 Mounting section

Claims

1. A pair of busbars that constitute the current path between two conductive paths, A printed circuit board is placed on at least one of the surfaces of the pair of busbars, and a conductive pattern connected to the control circuit is exposed on the substrate surface, The device includes a pair of power terminals mounted on the surface of the pair of busbars, and a control terminal mounted on the conductor pattern, and comprises a breaker unit for energizing and interrupting the pair of busbars, A circuit body in which at least one of the pair of power terminals has a mounting portion that is placed on the surface of the printed circuit board.

2. One of the pair of power terminals is connected to one of the pair of busbars connected to one of the two conductive paths. The other of the pair of power terminals is connected to the other of the pair of busbars which is connected to the other of the two conductive paths. The circuit body according to claim 1, wherein the other power terminal is composed of a plurality of terminal fittings, at least one of the terminal fittings constitutes the mounting portion mounted on the surface of the substrate, and the other terminal fittings are mounted on the other of the pair of busbars.

3. The circuit body according to claim 2, wherein at least one of the terminal fittings constituting the mounting portion is connected to the conductor pattern.

4. The circuit body according to claim 2 or 3, wherein at least one of the terminal fittings constituting the mounting portion is not connected to the conductor pattern.

5. The circuit body according to claim 2 or claim 3, wherein a plurality of the terminal fittings are arranged in parallel alongside the control terminal, and the mounting portion is configured including the terminal fitting that is furthest from the control terminal in the parallel direction.

6. The printed circuit board is mounted on the surface of the other of the pair of busbars. The other surface of the pair of busbars is partially exposed through a through-hole provided in the printed circuit board. The control terminal mounted on the conductor pattern and at least one of the terminal fittings constituting the aforementioned mounting portion are placed around the through hole in the printed circuit board. The circuit body according to claim 2 or 3, wherein the other terminal fittings are mounted on the surface exposed through the through hole.

7. One of the pair of power terminals is connected to one of the pair of busbars connected to one of the two conductive paths. The other of the pair of power terminals is connected to the other of the pair of busbars which is connected to the other of the two conductive paths. The circuit body according to any one of claims 1 to 3, wherein one of the power terminals is configured to include a flat terminal fitting, a portion of the flat terminal fitting constitutes a mounting portion placed on the surface of the substrate, and the other portion of the flat terminal fitting is mounted on one of the pair of busbars.

8. A pair of busbars that constitute the current path between two conductive paths, A printed circuit board is placed on at least one of the surfaces of the pair of busbars, and a conductive pattern connected to the control circuit is exposed on the substrate surface, The device includes a pair of power terminals mounted on the surface of the pair of busbars, and a control terminal mounted on the conductor pattern, and comprises a breaker unit for energizing and interrupting the pair of busbars, The housing portion of the main body of the blocking unit constitutes a mounting portion that is placed on the surface of the printed circuit board. The substrate surface on which the conductor pattern is exposed is located above the surface of the pair of busbars. A circuit body in which the surface of at least one of the pair of busbars is partially exposed through through-holes provided in the printed circuit board, and the power terminals are mounted by inserting them through the through-holes.

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