Air circulation passages connect an accommodation space of an electronic control unit to the outside to circulate air to buffer internal pressure fluctuations. The accommodation space side of the air circulation passages is formed as a divided air circulation passage with a plurality of passages, a cooling object member is arranged to come in thermal contact with air flowing through the divided air circulation passage, and the total cross-sectional area of the divided air circulation passage is smaller than the cross-sectional area of the air circulation passages that are not divided. Because the accommodation space of the electronic control unit is connected to the outside, internal pressure fluctuations can be buffered, and increasing the flow velocity of the air flowing through the divided air circulation passage on the accommodation space side of the air circulation passages allows heat inside the accommodation space to be efficiently radiated to the outside.

In an electrical device, a terminal block includes a mounting hole portion formed so as to be opened in a bottom surface and a mounting bore which is formed so as to be opened in a top surface, and connects the mounting hole portion and an outside of the top surface to each other, the swing-side interlock connector includes a swing-side housing which is mounted inside the mounting hole portion, and protrudes from the mounting bore, a cover is placed on the top surface of the terminal block by fitting a fitting hole to a protruding portion (31a) of the swing-side housing protruding from the mounting bore, and a gap portion which is formed around the protruding portion (31a), and connects the mounting hole portion and the outside of the top surface to each other is covered with the cover as viewed from the side of the housing opening portion.

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.

A single circuit board assembly for forming a vehicle-motor interface, the single circuit board assembly includes a first side of a board with logic modules located thereon. The single circuit board assembly also includes a second side of the board with power modules located thereon. The board comprises a plurality of layers, the plurality of layers having at least one through via and at least one buried via defined therein, wherein the at least one through via extends through all of the plurality of layers, the at least one buried via extending through less than all of the plurality of layers.

An in-vehicle electric device of this disclosure is provided in a front compartment of a vehicle and includes: at least one electronic component; a case in which the electronic component is accommodated; a connector connected to the electronic component inside the case and projecting rearward from a surface of the case; a fastening portion extended from a lower part of the case and fastened to a vehicle body of the vehicle; and a protective wall formed integrally with the fastening portion such that the protective wall extends upward along a first side face of the connector from the lower part of the case and projects further rearward from a rear end surface of the connector.

An inverter apparatus includes a main circuit substrate, an EMC filter substrate, a control substrate, and a panel. The main circuit substrate is configured to convert electric power and includes an output terminal through which the electric power is output from the inverter apparatus. The EMC filter substrate is provided on the main circuit substrate and configured to reduce propagation of electromagnetic noise. The EMC filter substrate includes a first input terminal through which the electric power is input to the inverter apparatus. The control substrate is provided on the EMC filter substrate so that the EMC filter substrate is sandwiched between the main circuit substrate and the control substrate. The control substrate is configured to control the main circuit substrate. The panel is provided on the control substrate so that the control substrate is sandwiched between the EMC filter substrate and the panel.

To improve cooling capability, power conversion apparatus 1 that converts a direct current voltage into an alternating current voltage includes: first substrate 100 on which power conversion circuit 2 is mounted; second substrate 200 on which driving circuit 3 that drives power conversion circuit 2 is mounted; and shield plate 300 that is disposed between first substrate 100 and second substrate 200, and first substrate 100 is a metal substrate.

This power conversion device includes a magnetic core which has a gap formed by cutting out a part of an annular shape, a resin primary molded body configured to hold the magnetic core by covering a first end portion and a second end portion of the magnetic core that are arranged opposite to each other with the gap therebetween from outside of the magnetic core in a radial direction, and a resin secondary molded body which has an exposed portion in which a surface of a portion of the primary molded body that covers the first end portion and the second end portion is exposed, and contains the primary molded body.

An electrical device, e.g., an inverter or converter, includes a first and a second printed circuit board. The first printed circuit board includes protruding tab regions, and a respective tab region protrudes into a respective recess of the second printed circuit board. Contact pins, e.g., of one or more plug connector parts, protrude into holes of the second printed circuit board.

Motor vehicle comprising an electric motor for driving the motor vehicle and a power converter device for supplying an alternating current to the electric motor, the power converter device having a cooling device, and the cooling device comprising at least one coolant connection, which is fluidically connected to a coolant port of the electric motor to form a common cooling circuit.