Abstract:
In an electronic control unit, high-heat-generating devices are mounted on a first surface or a second surface of a board, a heat-dissipating member is located facing the first surface of the board, and a heat-conducting member is located between the board and the heat-dissipating member. The heat-conducting member is in contact with the high-heat-generating devices to transfer heat of the high-heat-generating devices to the heat-dissipating member. A ratio of the number of the high-heat-generating devices mounted on the board to the number of the high-heat-generating devices arranged inside a first limited region of the first surface or a second limited region of the second surface is greater than a predetermined ratio. The second limited region is located at a position corresponding to the first limited region.
Abstract:
An electronic control unit includes a board, a heat-generating device, a connector, and a heatsink. The board has an insulating layer and a wiring pattern partially exposed outside the insulating layer. The heat-generating device is mounted on the board and electrically connected to the wiring pattern. The connector is located adjacent to the heat-generating device and has a connection terminal connected to the wiring pattern. The heatsink is located opposite to the board across the heat-generating device and in contact with the heat-generating device to dissipate heat of the heat-generating device. The wiring pattern has a land pattern including a mount portion and a connection portion. The heat-generating device is mounted on the mount portion. The connection terminal of the connector is connected to the connection portion.
Abstract:
A substrate of an electronic control unit has a control region on which a control component is disposed and a power region on which a power component is disposed. Substrate-fixing portions of a housing project from a bottom portion, and the substrate is fixed to the substrate-fixing portions. A heat radiating portion extends from the bottom portion. Semiconductor modules are fixed to a first outer surface and a second outer surface of the heat radiating portion, the first outer surface being on a side opposite to the power component. The heat radiating portion is located between the semiconductor modules and the power component. Therefore, heat interference between the semiconductor modules and the power component is reduced, and a heat radiation performance improves.