Abstract: Provided is a circuit board structure including a first circuit board having bus bars and a second circuit board arranged spaced apart from the first circuit board, multiple FET being arranged on the bus bars, and terminals of the multiple FETs being connected to the bus bars. The circuit board structure includes a conducting wire group sheet that covers a portion of the bus bar and is provided with multiple conducting wires that allow electricity to flow between gate terminals of the FETs and the second circuit board. The semiconductor element FETs, which are arranged side by side, are provided such that the gates terminals are arranged in the same direction with respect to the direction in which the semiconductor element FETs are arranged side by side.

Abstract: An electrical connection device includes a first conductive plate provided with a cutout in a circumferential edge portion of the first conductive plate and a second conductive plate adjacent to the first conductive plate without contacting the first conductive plate. A switching element includes a first terminal connected to the first conductive plate, a second terminal connected to the second conductive plate, and a control terminal, and that is turned on or off according to a voltage of the control terminal, wherein the electrical connection device further includes an insulator embedded in the cutout. A conductive path is provided on the surface of the insulator and that does not contact the first conductive plate, and to which the control terminal is connected.

Abstract: An electrical junction box includes a first conductive plate, a second conductive plate adjacent to the first conductive plate without contacting the first conductive plate, a switching element including a first terminal connected to the first conductive plate, a second terminal connected to the second conductive plate, and an element body on which the first terminal and the second terminal. A circuit board opposes and is spaced apart from the second conductive plate. A cover has an open side and covers the switching element and the circuit board. The cover includes a partitioning plate that partitions an inside of the cover so as to form a first chamber. The element body of the switching element is arranged in the first chamber, a second chamber is formed inside the cover by the partitioning plate and the second conductive plate, and the circuit board is arranged in the second chamber.

Abstract: A plate-shaped conductor is placed on an upper surface of a plate-shaped heat dissipation member with an insulation member interposed therebetween. A heat insulation member is placed at a location that is different from a location where the conductor is placed, on the upper surface of the heat dissipation member. An FET is electrically connected to the conductor. When current flows through the FET, the FET generates heat. A microcomputer that outputs a control signal for controlling operation of the FET is connected to an upper surface of the circuit board and is located opposite to the heat insulation member with the circuit board interposed therebetween.

Abstract: An electrical connection device includes a first conductive plate provided with a cutout in a circumferential edge portion of the first conductive plate and a second conductive plate adjacent to the first conductive plate without contacting the first conductive plate. A switching element includes a first terminal connected to the first conductive plate, a second terminal connected to the second conductive plate, and a control terminal, and that is turned on or off according to a voltage of the control terminal, wherein the electrical connection device further includes an insulator embedded in the cutout. A conductive path is provided on the surface of the insulator and that does not contact the first conductive plate, and to which the control terminal is connected.

Abstract: Provided is an electrical junction box in which it is possible to prevent a switching element from catching fire. An electrical junction box according to one aspect of the present disclosure is an electrical junction box including: a circuit substrate on which a switching element is mounted on one side of the circuit substrate; and a housing member that houses the circuit substrate. The housing member further houses a thermally expandable expansion material member. When the temperature of the switching element is low, the expansion material member is spaced apart from the circuit substrate and the switching element, and is disposed at a position opposing the one side. When the temperature of the switching element is high, the switching element is embedded in the thermally expanded expansion material member.

Abstract: A conductor is placed on a first placement portion of a heat dissipation member with an insulation member interposed therebetween. An FET is electrically connected to the conductor. When current flows between the drain and the source of the FET, the FET generates heat. A second placement portion of a circuit board is placed on the conductor. The conductor and the insulation member are sandwiched between the first placement portion and the second placement portion. In the heat dissipation member, a first extension portion extends from the first placement portion, and in the circuit board, a second extension portion extends from the second placement portion. The first extension portion is located opposite to and is spaced apart from the second extension portion, and a microcomputer is placed on an upper surface of the second extension portion. The microcomputer outputs a control signal for turning the FET ON or OFF.

Abstract: A conductor is placed on a first placement portion of a heat dissipation member with an insulation member interposed therebetween. An FET is electrically connected to the conductor. When current flows between the drain and the source of the FET, the FET generates heat. A second placement portion of a circuit board is placed on the conductor. The conductor and the insulation member are sandwiched between the first placement portion and the second placement portion. In the heat dissipation member, a first extension portion extends from the first placement portion, and in the circuit board, a second extension portion extends from the second placement portion. The first extension portion is located opposite to and is spaced apart from the second extension portion, and a microcomputer is placed on an upper surface of the second extension portion. The microcomputer outputs a control signal for turning the FET ON or OFF.

Abstract: A circuit assembly includes a circuit board having a control circuit controlling the flow of electric current in a power circuit is integrally formed with a top of a plate-shaped busbar. The circuit assembly includes a busbar that is provided with a first through hole, a circuit board in which both surfaces are provided with circuit patterns and that is provided with a second through hole that is aligned with the first through hole, an insulating sheet that is arranged on one side of the circuit board and is interposed between the busbar and the circuit board, and a conductive rivet that is inserted into the first through hole and the second through hole and fixes the circuit board to a top of the busbar. The rivet includes a body inserted into the first through hole and the second through hole, and a head protruding from the circuit board.

Abstract: A temperature fuse is ring-shaped and includes an insulation portion and a conductive portion arranged on an inner side and an outer side in a radial direction, and the conductive portion is formed of a thermal fuse element. An electrical junction box includes: a circuit board on which a switching element is mounted; a housing body for housing the circuit board; a conductive plate connected to the switching element, a first hole passing through the conductive plate; a terminal that is shaped as a plate and faces the conductive plate, a second hole passing through the terminal; the temperature fuse interposed between the conductive plate and the terminal in an axial direction, and a shaft-like insertion body for being inserted into the temperature fuse, the first hole, and the second hole.

Abstract: A plate-shaped conductor is placed on an upper surface of a plate-shaped heat dissipation member with an insulation member interposed therebetween. A heat insulation member is placed at a location that is different from a location where the conductor is placed, on the upper surface of the heat dissipation member. An FET is electrically connected to the conductor. When current flows through the FET, the FET generates heat. A microcomputer that outputs a control signal for controlling operation of the FET is connected to an upper surface of the circuit board and is located opposite to the heat insulation member with the circuit board interposed therebetween.

Abstract: Provided is an electrical junction box in which it is possible to prevent a switching element from catching fire. An electrical junction box according to one aspect of the present disclosure is an electrical junction box including: a circuit substrate on which a switching element is mounted on one side of the circuit substrate; and a housing member that houses the circuit substrate. The housing member further houses a thermally expandable expansion material member. When the temperature of the switching element is low, the expansion material member is spaced apart from the circuit substrate and the switching element, and is disposed at a position opposing the one side. When the temperature of the switching element is high, the switching element is embedded in the thermally expanded expansion material member.

Abstract: A circuit assembly includes a circuit board including a control circuit for controlling the flow of electric current in a power circuit is integral with the top of a plate-shaped busbar. The circuit assembly includes a circuit board in which both sides are provided with circuit patterns and having a via hole for electrically connecting the circuit patterns to each other, an adhesive sheet is interposed between the busbar and the circuit board and fixes the circuit board to the top of the busbar, a hole filling resin fills the via hole, and a resist layer is formed on at least a side of the circuit board that faces the busbar, covering the via hole filled with the hole filling resin. The adhesive sheet includes a substrate made of an insulating material, and adhesive layers are formed on both sides of the substrate and are sticky at room temperature.

Abstract: An electrical connection box includes: a circuit portion having bus bars including bus bar terminal portions; a case housing a circuit portion with electronic components mounted thereon; a through-hole is formed in each of the bus bar terminal portions; electrical wire terminal portions are connected to electrical wires, a through-hole is formed in each electrical wire terminal portions; stud bolts having a shaft portion and a head portion; and nuts are fastened to the stud bolts. The shaft portion is inserted into the through-holes of both the bus bar terminal portions and the electrical wire terminal portions, the bus bar terminal portions and the electrical wire terminal portions are overlaid on seat surfaces of the stud bolts, and a groove portion is formed over the entire circumference of each of the stud bolts where the seat surface and the outer circumferential surface of the shaft portion intersect.

Abstract: A circuit assembly includes a circuit board having a control circuit controlling the flow of electric current in a power circuit is arranged integrally with a top of a plate-shaped busbar. The circuit assembly includes a busbar that is provided with a first through hole, a circuit board in which both surfaces are provided with circuit patterns and that is provided with a second through hole that is aligned with the first through hole, an insulating sheet that is arranged on one side of the circuit board and is interposed between the busbar and the circuit board, and a conductive rivet that is inserted into the first through hole and the second through hole and fixes the circuit board to a top of the busbar. The rivet includes a body inserted into the first through hole and the second through hole, and a head protruding from the circuit board.

Abstract: A switching board includes: a control circuit board that has, on a first surface thereof, a control circuit, a connection circuit, a first mounting window, and a second mounting window; a circuit structure including an input bus bar and an output bus bar are arranged on a second surface of the control circuit board; and a first and second semiconductor switching element. The first semiconductor switching element is arranged inside the first mounting window. The drain terminal, the source terminal, and the gate terminal of the first semiconductor switching element are connected respectively to the input bus bar, the connection circuit, and the control circuit. The second semiconductor switching element is arranged inside the second mounting window. The drain terminal, the source terminal, and the gate terminal of the second semiconductor switching element are connected respectively to the output bus bar, the connection circuit, and the control circuit.

Abstract: A switching board is provided with a control circuit board including a control circuit, first mounting windows and second mounting windows, a circuit constituent including an input busbar, an output busbar and a connection busbar arranged on one surface of the control circuit board, and first and second semiconductor switching elements. The first semiconductor switching elements are arranged inside the first mounting windows and have drain terminals connected to the input busbar, source terminals connected to the connection busbar and gate terminals connected to the control circuit. The second semiconductor switching elements are arranged inside the second mounting windows and have drain terminals connected to the output busbar, source terminals connected to the connection busbar and gate terminals connected to the control circuit.

Abstract: An electrical connection box includes: a circuit portion having bus bars including bus bar terminal portions; a case housing a circuit portion with electronic components mounted thereon; a through-hole is formed in each of the bus bar terminal portions; electrical wire terminal portions are connected to electrical wires, a through-hole is formed in each electrical wire terminal portions; stud bolts having a shaft portion and a head portion; and nuts are fastened to the stud bolts. The shaft portion is inserted into the through-holes of both the bus bar terminal portions and the electrical wire terminal portions, the bus bar terminal portions and the electrical wire terminal portions are overlaid on seat surfaces of the stud bolts, and a groove portion is formed over the entire circumference of each of the stud bolts where the seat surface and the outer circumferential surface of the shaft portion intersect.

Abstract: An electrical connection box includes: a circuit portion having bus bars as conduction paths, electronic components mounted on the circuit portion; a case housing the circuit portion; Substrate Terminal Portions (“STPs”) are provided on the bus bars, a through-hole formed in the STPs Electric Wire Terminal Portions (“EWTPs”) are connected to electrical wires, a through-hole formed in the EWTPs; stud bolts have shaft portions inserted into the through-holes of the STPs and the EWTPs in a state where the STPs and the EWTPs are overlaid on each other; and nuts are fastened to the stud bolts. The EWTPs or the STPs have contact portions that come into contact with seat surfaces of the stud bolts, and the surface on the seat surface sides of the contact portions are recessed so as to have a reduced thickness dimension.

Abstract: A switching device includes a switching board with busbars, an upper case and stud bolts and nuts for fixing fastening terminals connected to wiring harnesses to the busbars. The upper case includes guide walls for guiding movements of the fastening terminals to fastening positions, and the restriction walls for restricting the rotation of the fastening terminals. The restriction walls are arranged to prevent a contact of the fastening terminal when the fastening terminal is rotated until the wiring harness comes into contact with the restriction wall.