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公开(公告)号：US10404178B2
公开(公告)日：2019-09-03
申请号：US16093421
申请日：2017-04-11
发明人： Koji Nakajima , Takashi Kumagai , Yuji Shirakata , Yujiro Kido
摘要： An insulation type step-up converter includes a core, first and second primary-side coils, a secondary-side coil, and a switching element. The core includes a middle leg, and first and second outer legs. The switching element is configured such that it can be controlled to be on/off so that electric currents flowing simultaneously in the first and second primary-side coils are opposite in direction to each other.
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公开(公告)号：US09941044B2
公开(公告)日：2018-04-10
申请号：US15541400
申请日：2016-02-19
发明人： Koji Nakajima , Takashi Kumagai , Yuji Shirakata , Yujiro Kido , Kenji Nishizaka
CPC分类号： H01F27/2804 , H01F27/2876 , H01F27/40 , H01F2027/2809 , H01F2027/2819 , H01F2027/408 , H02M3/335 , H02M3/33507 , H05K1/0298 , H05K1/115
摘要： An insulation type step-down converter includes first and second step-down transformers each of which includes an input-side coil and an output-side coil. An intermediate portion of the output-side coil of the first step-down transformer and an intermediate portion of the output-side coil of the second step-down transformer are connected to each other. First, second, third, and fourth rectifier elements are connected in series with first, second, third, and fourth output-side coils, respectively. Smoothing coils are connected to the first to fourth output-side coils. The first, second, third, and fourth rectifier elements are connected such that electric currents flow simultaneously in the first output-side coil and the third output-side coil, and electric currents flow simultaneously in the second output-side coil and the fourth output-side coil in a manner alternating with the electric currents in the first output-side coil and the third output-side coil.
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公开(公告)号：US11206729B2
公开(公告)日：2021-12-21
申请号：US16094561
申请日：2017-04-25
发明人： Shota Sato , Koji Nakajima , Takashi Kumagai , Yuji Shirakata
摘要： Provided is a highly reliable power circuit device. The power circuit device includes a printed substrate, a power circuit, and a housing. The power circuit is formed on the printed substrate. The housing is connected with the printed substrate. The power circuit includes secondary-side switching elements, at least one smoothing choke coil, and smoothing capacitors. Portions of a smoothing choke coil core serving as a core of the smoothing choke coil are inserted in opening portions formed in the printed substrate. A winding of the smoothing choke coil is formed on the printed substrate. The smoothing choke coil is located between a region C in which the smoothing capacitors are arranged and regions A and B serving as a second region in which primary-side switching elements and the secondary-side switching elements serving as electric elements are arranged.
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公开(公告)号：US11129309B2
公开(公告)日：2021-09-21
申请号：US16982852
申请日：2019-03-18
IPC分类号： H05K7/20
摘要： A cooling device to be provided is capable of being reduced in size, capable of cooling a heating component uniformly, having high radiating performance, and facilitating implementation of a work in a flat state. A first cooler body includes a first base plate and first blades. The first base plate has a first component mounting surface. A second cooler body includes a second base plate and second blades. The second base plate has a second component mounting surface. With the second cooler body maintained connected to the first cooler body, a rotary mechanism allows the second cooler body to rotate relative to the first cooler body between a state in which the first component mounting surface and the second component mounting surface are pointed to the same direction and a state in which the second blades get into gaps between the first blades without interfering with the first blades.
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公开(公告)号：US09960697B2
公开(公告)日：2018-05-01
申请号：US15517619
申请日：2015-11-06
发明人： Koji Nakajima , Takashi Kumagai , Yuji Shirakata , Yujiro Kido
CPC分类号： H02M3/33569 , H01F27/22 , H01F27/24 , H01F27/2804 , H01F27/2847 , H01F27/2876 , H01F2027/2809 , H01F2027/2819 , H02M3/3376 , H02M7/003 , H02M2001/0048 , Y02B70/1491
摘要： An insulation type step-down converter includes first, second, third, and fourth secondary-side coils, and first, second, third, and fourth rectifier elements. The first, second, third, and fourth rectifier elements is capable of performing rectification such that electric currents flow alternately only in one of the first and second secondary-side coils and one of the third and fourth secondary-side coils, and electric currents flowing simultaneously in one of the first and second secondary-side coils and one of the third and fourth secondary-side coils are opposite in direction to each other so as to cancel out a magnetic flux passing through the middle leg each time when electric current flowing in the primary-side coil is changed in direction. Provided is an insulation type step-down converter which can minimize an increase in heat generated by the primary-side coil even at a large step-down ratio of a step-down transformer without raising manufacturing costs.
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公开(公告)号：US10912232B2
公开(公告)日：2021-02-02
申请号：US16462294
申请日：2017-11-29
发明人： Koji Nakajima , Yuji Shirakata , Kenta Fujii , Shota Sato
摘要： In an electronic circuit board of a power conversion device or the like, heat interference between parts mounted on a multi-layer printed circuit board is suppressed in order to place the mounted parts close to each other. The mounted parts include a semiconductor element and a magnetic part formed by a coil pattern, which is made from a copper foil of the printed circuit board, and by a magnetic core. A screw fixing portions is placed in the surroundings of the semiconductor element and the coil pattern. A heat radiation pattern connected to the screw fixing portion is provided between and around the semiconductor element and the coil pattern when viewed from a direction perpendicular to a principal surface of the multi-layer printed circuit board. The screw fixing portion is connected to a cooler in a manner that gives the screw fixing portion heat conductance and electrical conductance.
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公开(公告)号：US10748859B2
公开(公告)日：2020-08-18
申请号：US16029120
申请日：2018-07-06
发明人： Kenta Fujii , Yuji Shirakata , Masahiro Ueno , Tomoaki Shimano
IPC分类号： H01L23/04 , H01L23/62 , H01L23/31 , H01L23/367 , H01L23/495 , H01L23/00 , H02H7/12
摘要： A power converting device such that an overcurrent is interrupted and damage to a power semiconductor element can be prevented is obtained. The power converting device includes a power semiconductor element, a wiring member connected to an electrode of the power semiconductor element, a bus bar that supplies power to the power semiconductor element, and a frame that houses the power semiconductor element, wherein the bus bar has a connection terminal connected to the wiring member, and a fuse portion is provided in the connection terminal.
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公开(公告)号：US11373832B2
公开(公告)日：2022-06-28
申请号：US16634212
申请日：2017-08-30
发明人： Kenta Fujii , Yuji Shirakata , Masahiro Ueno , Tomoaki Shimano
IPC分类号： H01H85/02 , H01H85/08 , H01H85/175 , H01H85/38
摘要： There is provided an electric-power conversion apparatus in which smoke emission, a burnout, and short-circuiting between a melted material and a peripheral member can be suppressed even when a fuse portion is melted by an excessive current. An electric-power conversion apparatus includes an electric power semiconductor device, an electrode wiring member, a case, a fuse portion formed in the electrode wiring member, a fuse resin member disposed between the fuse portion and the case, and a sealing resin member that seals the electric power semiconductor device, the electrode wiring member, the fuse portion, and the fuse resin member in the case.
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公开(公告)号：US11350517B2
公开(公告)日：2022-05-31
申请号：US16963294
申请日：2019-01-18
发明人： Hiroyuki Yahara , Kenta Fujii , Yuji Shirakata , Tomohito Fukuda , Takashi Kumagai , Koji Nakajima
摘要： A circuit device capable of significantly improving heat dissipation performance of a printed circuit board without increasing the size includes a printed circuit board, a mounted component, a non-solid metal spacer, a cooler, and a resin layer. The mounted component is at least partially disposed on at least one main surface of printed circuit board. The non-solid metal spacer is disposed at least on one main surface of the printed circuit board. The cooler is disposed at the non-solid metal spacer on the opposite side to the printed circuit board. The resin layer is disposed between the non-solid metal spacer and the cooler. The non-solid metal spacer has a shape that allows at least one hollow portion to be formed between the printed circuit board and the cooler.
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公开(公告)号：US11049682B2
公开(公告)日：2021-06-29
申请号：US16634687
申请日：2017-08-30
发明人： Yuji Shirakata , Kenta Fujii , Masahiro Ueno , Tomoaki Shimano
摘要： There is provided an electric-power conversion apparatus in which smoke emission, a burnout, and short-circuiting can be suppressed even when a fuse portion is melted by an excessive current and in which it is made possible that heat generated in the fuse portion is less likely to be transferred to the electric power semiconductor device. The electric-power conversion apparatus includes a fuse portion formed in an electrode wiring member, a fuse resin member that covers the fuse portion, and a sealing resin member that seals an electric power semiconductor device and the fuse portion in a case. Along a current-flowing direction, the fuse portion includes an upstream-side first step portion whose cross-sectional area is smaller than that of the portion at the upstream side thereof, a second step portion whose cross-sectional area is smaller than that of the upstream-side first step portion, and a downstream-side first step portion whose cross-sectional area is larger than that of the second step portion but is smaller than that of the portion at the downstream side thereof.
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