公开(公告)号：US20170329006A1

公开(公告)日：2017-11-16

申请号：US15529427

申请日：2014-11-25

Applicant: HITACHI, LTD.

Inventor： Daichi KAWAMURA ,  Toru MASUDA ,  Hiroshi KAGEYAMA ,  Ayumu HATANAKA

IPC: G01S15/89 ,  G01N29/14 ,  G01N21/64 ,  H04B10/079 ,  G01H9/00

CPC classification number: G01S15/8968 ,  G01H9/004 ,  G01N21/6402 ,  G01N29/14 ,  G01N29/2418 ,  G01N29/42 ,  H04B10/07957 ,  H04R23/008

Abstract: An acoustic emission wave detector includes a housing, an optical fiber that guides light from a wideband light source into the housing, and an FBG housed in the housing and having a diffractive grating that reflects light guided into the housing. The FBG is fixed on a side of the other end in the housing such that the light guided into the housing is received by one end thereof. An acoustic emission wave from a high-voltage apparatus is received by the other end thereof.

公开(公告)号：US20180026009A1

公开(公告)日：2018-01-25

申请号：US15527089

申请日：2015-03-13

Applicant: HITACHI, LTD.

Inventor： Ryuusei FUJITA ,  Satoru AKIYAMA ,  Hiroshi KAGEYAMA ,  Toru MASUDA ,  Ayumu HATANAKA ,  Akio SHIMA

IPC: H01L25/065 ,  H01L23/498 ,  H01L23/467 ,  H02P27/06 ,  B60L11/18 ,  H02M7/00 ,  H01L27/06

CPC classification number: H01L25/0655 ,  B60L11/1803 ,  B60L11/1812 ,  B60L15/007 ,  H01L23/467 ,  H01L23/49844 ,  H01L25/00 ,  H01L27/0629 ,  H01L2224/0603 ,  H01L2224/49111 ,  H01L2224/49113 ,  H02M7/003 ,  H02P27/06

Abstract: The object of the present invention is to compensate for a difference in threshold voltage between a plurality of switching devices incorporated in a power module.The present invention solves the subject described above by mounting a switching device having a high threshold voltage in comparison with a different switching device at a location at which the temperature of the power module during operation is higher than that at another location at which the different switching device is mounted. Eventually, a power conversion apparatus of a high performance and a vehicle drive apparatus of a high performance can be provided.

公开(公告)号：US20170170157A1

公开(公告)日：2017-06-15

申请号：US15325784

申请日：2014-07-15

Applicant: Hitachi, Ltd.

Inventor： Toru MASUDA ,  Akitoyo KONNO

IPC: H01L25/18 ,  H01L25/07 ,  H01L23/00 ,  H01L23/48

CPC classification number: H01L25/18 ,  H01L23/48 ,  H01L24/48 ,  H01L24/49 ,  H01L25/072 ,  H01L2224/0603 ,  H01L2224/48091 ,  H01L2224/48137 ,  H01L2224/49113 ,  H01L2924/00014 ,  H01L2924/13055 ,  H01L2924/13091 ,  H01L2224/45099

Abstract: A first conductive pattern includes: a first feeding point for supplying a potential to the first conductive pattern located at one end thereof; one or more diode elements located over the first conductive pattern; and a plurality of switching elements over the first conductive pattern on the opposite side to the first feeding point with the diode elements in between. A second conductive pattern includes a second feeding point that is provided in proximity to the first feeding point and supplies a potential different from that for the first conductive pattern to the second conductive pattern. The plurality of the switching elements is electrically connected with the second conductive pattern through a plurality of bonding wires. The second conductive pattern is provided with a slit pattern that defines an area of connection of the plurality of the bonding wires with the second conductive pattern over the second conductive pattern.