A printed circuit board is housed in a connector. A temperature sensor is mounted on the printed circuit board between two connection pads located on one of the faces of the printed circuit board. A contact housed in the connector is placed in thermal continuity with two thermal conduction lands, one of which is arranged on the same face of the printed circuit board as the connection pads and the other of which is arranged beneath the temperature sensor. Each of the connection pads is connected to a temperature measurement circuit.

A package structure including a circuit board and a heat generating element is provided. The circuit board includes a plurality of circuit layers and a composite material layer. A thermal conductivity of the composite material layer is between 450 W/mK and 700 W/mK. The heat generating element is disposed on the circuit board and electrically connected to the circuit layers. Heat generated by the heat generating element is transmitted to an external environment through the composite material layer.

Provided is an electronic control unit capable of suppressing an increase in size of a board. An electronic control unit of the present invention includes a connector having a power supply terminal, a power supply board 12 (first board), and a control board 13 (second board). The power supply board includes an inner-layer copper foil 55 (inner-layer conductor), and a power conversion circuit that converts input power input via a power supply terminal into predetermined output power is mounted thereon. The control board 13 includes an inner-layer copper foil 55, and mounted with a control circuit is mounted thereon. In addition, a thickness of the inner-layer copper foil 55 of the power supply board 12 is thicker than a thickness of the inner-layer copper foil 55 of the control board 13.

According to an embodiment of the disclosure, a wearable electronic device may include a housing, a first printed circuit board (PCB), a second PCB disposed in parallel with the first PCB, a first interposer, and a second interposer, and the housing may include at least one first opening formed on a first portion, and the first interposer and the second interposer may be disposed between the first PCB and the second PCB, the first interposer and the second interposer may be disposed to have a first end of the first interposer and a second end of the second interposer facing the first end, spaced apart by a designated distance, and a first space between the first end and the second end may be connected to the at least one first opening of the housing. Various other embodiments are possible.

A component carrier includes a stack having at least one electrically conductive layer structure and/or at least one electrically insulating layer structure. A component is embedded in the stack. A first thermally conductive block is located above and thermally connected with the component, and a second thermally conductive block is located below and thermally coupled with the component. Heat generated by the component during operation is removed via at least one of the first thermally conductive block and the second thermally conductive block.

A method for manufacturing a circuit board, includes: stacking a first peelable film on a second peelable film, and disposing fluffy carbon nanotubes between the first peelable film and the second peelable film, thereby obtaining a carbon nanotube layer; pressing the first peelable film, the carbon nanotube layer, and the second peelable film to compact the fluffy carbon nanotubes, thereby obtaining a thermal conductive layer; removing the first peelable film, and disposing a first adhesive layer, a first dielectric layer, and a first circuit layer on a side of the thermal conductive layer away from the second peelable film; removing the second peelable film, and disposing a second adhesive layer, a second dielectric layer, and a second circuit layer on a side of the thermal conductive layer away from the first adhesive layer; mounting an electronic component on the first circuit layer.

An electronic control device includes a board including a heat sink on which a heat generation element is mounted, and a housing that is in contact with the board and dissipates heat of the heat generation element to the outside. A potential of the housing is a ground, and a potential of the heat sink is a non-ground. The board includes a first layer including a first non-ground wiring that is in direct contact with the heat sink, and a second layer including a second ground wiring that is in electrical and thermal contact with the housing. The first non-ground wiring and the second ground wiring overlap each other in plan view from a thickness direction of the board.

An object of the present disclosure is to be able to further reduce the size of a substrate structure including a plurality of elements. The substrate structure includes: a base substrate that includes a first conductive plate and a second conductive plate; a first element connected to the first conductive plate and the second conductive plate; and a second element connected to the first conductive plate and the second conductive plate. The first conductive plate and the second conductive plate are disposed on the same plane on the base substrate in a state of being electrically insulated from each other, the first element is mounted on a first main surface of the base substrate, and the second element is mounted on a second main surface that is on the opposite side to the first main surface relative to the base substrate.

A multilayer circuit board includes a board body including insulator layers stacked upon each other, a first land pattern at the board body to mount a passive component, a second land pattern at the board body to mount an active component, and a heat-dissipation layer between the insulator layers and extending along main surfaces of the insulator layers. The heat-dissipation layer includes a hole extending therethrough in a stacking direction of the insulator layers. In a plan view from the stacking direction, an outer edge of the hole of the heat-dissipation layer is on an outer side of the first land pattern, or overlaps the first land pattern.

A component carrier includes a stack with at least one electrically conductive layer structure, at least one electrically insulating layer structure, a cavity delimited at a bottom side at least partially by a top side of a stepped metal structure of the at least one electrically conductive layer structure, and a component embedded in the cavity and arranged on the stepped metal structure. A bottom side of the stepped metal structure has a flat surface extending continuously along at least one horizontal direction.