Fuji Electric Co., Ltd.

Yuta Tamai

Hiromichi Gohara

Takafumi Yamada

Toshiyuki Miyasaka

Takeshi Matsushita

Naoyuki Kanai

Takahiro Koyama

Fumihiko Momose

Yuichiro Hinata

Narumi Sato

A cooling apparatus for a semiconductor module including a semiconductor chip includes a top plate having a lower surface a bottom plate disposed to have a refrigerant circulation portion between the bottom plate and the lower surface of the top plate and a side wall configured to surround the refrigerant circulation portion. The side wall includes a fixed portion fixed to the top plate or the bottom plate with a fixing material. The fixed portion includes an edge portion disposed to face the top plate or the bottom plate and a separated portion disposed to be adjacent to the edge portion in a first direction in which the refrigerant circulation portion and the side wall are aligned, the separated portion being disposed farther from the top plate or the bottom plate disposed to face the edge portion than the edge portion.

Cooling apparatus and semiconductor module

Provided is an electronic apparatus including a metal wiring. The metal wiring includes a plurality of first regions covered with a solder layer, a second region provided between two first regions of the plurality of first regions, and a third region having a nitrogen amount of 20 atoms % or more. An oxygen amount is largest in the second region, followed by at least one of the plurality of first regions, and then by the third region. The nitrogen amount may be largest in the third region, followed by at least one of the plurality of first regions, and then by the second region.

Electronic apparatus and method for manufacturing electronic apparatus

A semiconductor apparatus includes first and second semiconductor chips, and a circuit board. The circuit board is a laminated board sequentially including an insulating plate, a circuit layer, and a metal layer. The circuit layer includes a first mounting portion on which the first semiconductor chip is installed, a second mounting portion on which the second semiconductor chip is installed, and a first and second upper surface slit provided between the first and second mounting portion and extending in a first direction. The metal layer includes a first lower surface slit extending in the first direction. In a plan view, the first mounting portion, the first upper surface slit, the second upper surface slit, and the second mounting portion are provided side by side in the second direction. The first lower surface slit is located within a range defined by the first and second upper surface slit.

Semiconductor apparatus and vehicle

A semiconductor module is provided with: a case having a frame that surrounds a substrate and a terminal block formed extending inward from an inner wall surface of the frame; a terminal having one end extending outward from the frame, and another end extending inward from the frame and being secured to a top face of the terminal block; a wiring member that electrically connects the terminal and a semiconductor element on the substrate; and an encapsulating resin that encapsulates the other end of the terminal, the wiring member, and the semiconductor element inside the case. A hole is formed in the top face of the terminal block. The hole is filled with the encapsulating resin, and is positioned closer to the inner wall surface of the frame than a bonding part between the terminal and the wiring member.

Semiconductor module

A power semiconductor module including a cooling apparatus and a power semiconductor device mounted on the cooling apparatus, wherein the cooling apparatus includes: a ceiling plate that; a case; and a cooling fin, a ceiling plate and the case respectively include fastening portions that are used to fasten the ceiling plate and the case to an external apparatus, while the ceiling plate and the outer edge portion are arranged in an overlapping manner, the power semiconductor device includes a circuit substrate and a terminal case, the fastening portions protrude farther outward than a periphery of the ceiling plate, and the terminal case includes a case body arranged along a perimeter of the circuit substrate and reinforcing portions that extend to top surface sides of the fastening portions.

Power semiconductor module and vehicle

A semiconductor device has a U terminal with an internal joint portion at one end that is joined to a circuit board, an intermediate portion that is embedded in a case, and an external joint portion at another end that is exposed from the case, the U terminal being provided with a shock absorbing portion that is positioned between an inner surface of the case and the internal joint portion and absorbing stress that acts upon the internal joint portion. Due to the presence of the shock absorbing portion, even when the entire semiconductor device deforms or there is local deformation such that stress becomes concentrated at the joined surfaces of the internal joint portion and the circuit board, the stress is absorbed by the shock absorbing portion.

Semiconductor device and a method of manufacturing the same

A cooling apparatus for a semiconductor module including a semiconductor chip is provided, including; a ceiling plate having a lower surface; a casing portion having a coolant circulation portion and an outer edge portion surrounding the coolant circulation portion, the coolant circulation portion being arranged to face the lower surface of the ceiling plate, and the casing portion being closely attached, directly or indirectly, to a lower surface of the ceiling plate at the outer edge portion; and a cooling fin arranged in the coolant circulation portion, where the ceiling plate and the casing portion have a fastening portion in which the ceiling plate and the outer edge portion are stacked, and the fastening portion fastens the ceiling plate and the casing portion to an external device, and the cooling apparatus further includes a reinforcing member provided between the ceiling plate and the casing portion at the fastening portion.

Cooling apparatus, semiconductor module, and vehicle

A laser welding method using a laser welding jig having a plurality of pressing parts, includes a step of placing a second member on a first member; a step of pressing the second member with the plurality of pressing parts in a direction toward the first member to thereby form a gap between the first member and the second member at most 300 &#x3bc;m; and a first welding step of laser-welding the first member and the second member by irradiating on a surface of the second member at a location between the pressing parts with laser light while conducting the step of pressing.

Laser welding method

A laser welding machine includes: an elevator that is capable of sliding an elevating platform; a pressing actuator that is fixed to the elevating platform at a base part of the pressing actuator and has a tip slidably connected to the base part and pressing a conductive upper terminal toward a conductive lower terminal; a laser oscillator; a machining optical device that is fixed to the elevating platform and has a lens to focus the laser light emitted from the laser oscillator; a position detector that detects a vertical positioning of the pressing actuator; a counter that receives an output of the position detector and delivers position information; and a control circuit that controls, based on the received signal from the counter, the elevator, the pressing actuator, and the machining optical device, and controls operation of the laser oscillator.

Laser welding machine and laser welding method using the same

A method for producing a semiconductor device includes laser welding to bond an upper terminal and a lower terminal as internal wiring members of the semiconductor device. When the upper terminal is fixed to the lower terminal by the laser welding, a gap between an upper surface of the lower terminal and a lower surface of the upper terminal is equal to or more than 20 &#x3bc;m and equal to or less than 400 &#x3bc;m.

Method for producing semiconductor device

In a laser welding method, a gap between first and second members to be welded is made at most 300 &#x3bc;m by pressing the second member against the first member with claws that are pressing parts of a laser welding jig, and the second member to be welded at a place between the claws is irradiated by laser light to laser-weld the first member and the second member. In a semiconductor device, the gap between the first member and the second member at the portion of laser-welding is at most 300 &#x3bc;m.

Growing community of inventors

Matsumoto, Japan

Yuta Tamai