A first circuit board includes a positive output pin and a negative output pin of a power conversion circuit, each of which has a shape projecting from a second main surface. A second circuit board has a positive through via and a negative through via, each of which has a shape extending between a third main surface and a fourth main surface. The second main surface of the first circuit board and the third main surface of the second circuit board are physically in close contact with each other. The positive output pin is inserted through the positive through via to reach the fourth main surface. The negative output pin is inserted through the negative through via in such a manner as to reach the fourth main surface. The load receives a current supplied from the power conversion circuit through the positive output pin and the negative output pin.

A circuit board module includes a first circuit board having a first main surface on which an electronic component that generates heat when the electronic component operates is mounted and a second main surface, a second circuit board having a third main surface on which the first circuit board is mounted and a fourth main surface, and a first thermally-conductive sheet between the first circuit board and the second circuit board. The first circuit board is mounted such that the second main surface faces the third main surface. The first circuit board includes thermally-conductive vias that extend between the first and second main surfaces, the vias being densely distributed in a region near a mounting terminal of the electronic component, filled with a thermally-conductive member, and physically in contact with the first thermally-conductive sheet that covers the third main surface of the second circuit board.

A low voltage converter includes a transformer controller configured to control at least one switch to supply a high voltage of a main battery to a transformer. The transformer is configured to convert the high voltage of the main battery to a low voltage. An output circuit is configured to output the low voltage to a load or a battery through a capacitor coupled in series with an inductor is provided.

A power conversion apparatus includes a case having a heat-dissipation property, and including a housing part formed to surround a predetermined space, a resin material having a thermal conductivity, the resin material being provided in the predetermined space, a coil disposed in the predetermined space, a coil case having a shape that fits with the housing part, the coil case being configured to house the coil, and a power semiconductor device disposed along a side wall of the coil case. The power semiconductor device is pressed and fixed between a side wall of the housing part and the side wall of the coil case in a state where a heat dissipation surface is in contact with the side wall of the housing part.

The present disclosure provides a module including a circuit board, a first component and a second component. The circuit board includes a first side and a second side opposite to each other and includes a first plane and second plane disposed on the first side. A first height difference is formed between the first plane and the second plane. The first component and the second component are disposed on the first plane and the second plane, respectively. The first component and the second component include a first contact surface and a second contact surface, respectively. The first contact surface and the second contact surface are coplanar with a first surface of the module. It benefits to reduce the design complexity of a heat-transfer component, and enhance the heat dissipation capability and the overall power density of the module simultaneously.

The power conversion device includes: a housing; an electric wiring board stored in the housing; a first heat generating component provided on the one surface of the electric wiring board; a second heat generating component which has a lower heat generation density than the first heat generating component and of which a protruding height from the electric wiring board is equal to or smaller than a protruding height of the first heat generating component, the second heat generating component being provided on the one surface of the electric wiring board; and a third heat generating component which has a lower heat generation density than the first heat generating component and of which a protruding height from the electric wiring board is greater than the protruding height of the first heat generating component, the third heat generating component being provided on another surface of the electric wiring board.

A power converter according to the present disclosure includes a cooling plate and a plurality of circuit elements. The cooling plate includes a first cooling surface and a second cooling surface on an opposite side from the first cooling surface. The cooling plate is provided with a through hole passing through between the first and second cooling surfaces. The circuit elements convert AC power supplied from an external power source into DC power of a certain voltage and output the DC power. The circuit elements at least include first and second circuit elements. The first circuit element includes a first terminal and is thermally connected to the first cooling surface. The second circuit element includes a second terminal electrically connected to the first terminal and inserted into the through hole, and is thermally connected to the second cooling surface.

Disclosed is a semiconductor article including: a metal bus bar and a metal heat sink wherein at least a portion of a first side of the metal bus bar is bonded to at least a portion of the metal heat sink by a polyimide layer without adhesive; and a semiconductor power device disposed on a second side of the metal bus bar.

A fluid circulator including a pump body with an impeller; an electric motor having a rotor connected to the impeller for rotatably driving the impeller; an end portion associated with the motor body for housing at least one electronic board for controlling the circulator. The end portion is monolithically cup-shaped lid fitted onto the motor body in substantial continuity therewith enclosing a housing compartment for said electronic board; an electronic power device mounted onto the electronic board so as to face the end wall of the cup-shaped lid; at least one portion of said end wall being recessed towards the electronic board and being externally provided with at least one cooling fin extending in parallel to the axis of the motor to constitute a heat sink; and a layer of a heat-conductive paste material in contact with the electronic power devices and recessed surface.

In the case where as a communication means among two or more control circuit boards corresponding to an on-vehicle environment, a wire harness is mounted, space-saving efficiency and assembly efficiency pose problems. When a board-to-board connector is utilized, arrangement of the control circuit boards cannot freely be performed, due to restriction of predetermined specific dimensions. An electric-power conversion apparatus includes a cooling device having a first surface, a second surface opposite to the first surface, and a hole penetrating the first surface and the second surface, a first control circuit board provided at the first surface side, a second control circuit board provided at the second surface side, and a pin header having a mold portion that partially wraps a connection pin penetrating the hole so as to connect the first control circuit board with the second control circuit board and that is fixed to the cooling device.