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公开(公告)号：US20210217571A1
公开(公告)日：2021-07-15
申请号：US17040966
申请日：2019-02-12
Inventor： Akira KATO , Kazuyuki SAKIYAMA , Takehiko YAMAKAWA , Motohiko FUJIMURA
Abstract: An electromagnet device moves two moving contacts from one of a closed position or an open position to the other position when an electric current flows through a coil. A regenerative current coming from the coil flows through a regeneration unit when the coil makes a transition from an energized state where the coil is supplied with an electric current from a power supply to a non-energized state where the coil is supplied with no electric current from the power supply. The control unit causes the regenerative current to flow through a load by controlling a switch when the coil makes the transition from the energized state to the non-energized state.
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2.发明公开公开(公告)号：US20240071678A1
公开(公告)日：2024-02-29
申请号：US18268126
申请日：2021-12-24
Inventor： Akira KATO , Takehiko YAMAKAWA
CPC classification number: H01F27/263 , H01F27/08 , H02J50/10
Abstract: A transformer device according to the disclosure includes a transformer and a cooling device that cools the transformer. The transformer includes a primary coil, a secondary coil, and a first core and a second core, into which the primary and secondary coils are respectively inserted. The first and second cores are disposed to face each other. The first core includes a first core part and a second core part, each of the first and second core parts formed by dividing the first core in a predetermined division plane. The first and second core parts of the first core are disposed to face each other through a gap, and in which the first core and the cooling device are disposed to face each other.
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公开(公告)号：US20210027964A1
公开(公告)日：2021-01-28
申请号：US17040955
申请日：2019-02-22
Inventor： Takehiko YAMAKAWA , Kazuyuki SAKIYAMA , Akira KATO
Abstract: An electromagnetic relay includes a fixed contact, a moving contact, an electromagnet device, and a second coil. The moving contact moves from a closed position where the moving contact is in contact with the fixed contact to an open position where the moving contact is out of contact with the fixed contact, and vice versa. The electromagnet device includes a first coil and a mover. The mover is actuated on receiving a magnetic flux generated when a current flows through the first coil to move the moving contact from one of the closed position or the open position to the other position. The second coil gives, when a current flows through the second coil, at least a magnetic flux, of which a direction is opposite from a direction of the magnetic flux generated by the first coil, to the mover.
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Patent Agency Ranking
公开(公告)号：US20230028214A1
公开(公告)日：2023-01-26
申请号：US17783561
申请日：2020-12-10
Inventor： Takehiko YAMAKAWA , Hiromu MATSUMOTO , Susumu NAKAMURA , Yutaka MIYAMOTO
Abstract: A transformer includes a primary winding, a secondary winding, a first core, and a second core. The primary winding and the secondary winding are inserted into the first core and the second core, and the first core and the second core are disposed to face each other. The first core includes one first core portion, and the second core includes a plurality of second core portions. The first core is a lower core, and the second core is an upper core. The first core and the second core are disposed to face each other with a gap interposed between the first core and the second core. The first core and the second core include a heat-resistant elastic body in the gap, and are disposed to face each other. Each of the second core portions is disposed with a heat-resistant elastic body interposed between the second core portions.
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公开(公告)号：US20220166329A1
公开(公告)日：2022-05-26
申请号：US17441184
申请日：2020-02-14
Inventor： Akira KATO , Motohiko FUJIMURA , Kazuyuki SAKIYAMA , Takehiko YAMAKAWA , Taiki NISHIMOTO
Abstract: A power conversion device is equipped with at least one leg circuit containing two switching elements connected in series, respectively, a transformer having a primary winding and a secondary winding, a capacitor connected between the leg circuit and one end of the primary winding, a switch circuit, and a rectifier circuit. The switch circuit selectively connects one of a plurality of winding sections of the secondary winding that are different from each other to the rectifier circuit
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6.发明公开公开(公告)号：US20240088793A1
公开(公告)日：2024-03-14
申请号：US18271176
申请日：2021-12-27
Inventor： Takehiko YAMAKAWA , Hiromu MATSUMOTO , Susumu NAKAMURA , Yutaka MIYAMOTO
CPC classification number: H02M3/33573 , H02J7/00712 , H02M1/0067 , H02M1/4233 , H02M3/003 , H05K7/20927 , H02J2207/20
Abstract: A power conversion apparatus is provided with: a plurality of power conversion circuits each provided with a transformer and supplying DC power to a common rechargeable battery; a control circuit configured to control the power conversion circuits; and a cooling device configured to cool the power conversion circuits. The cooling device is provided with at least one flow path for a coolant, the flow path being in thermal contact with the transformers of the power conversion circuits. When a load voltage of the rechargeable battery is equal to or higher than a predetermined threshold, the control circuit operates one power conversion circuit of the plurality of power conversion circuits, the one power conversion circuit provided with the transformer having a largest thermal contact area with the flow path, and stops operations of other power conversion circuits of the plurality of power conversion circuits.
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7.发明公开公开(公告)号：US20240055995A1
公开(公告)日：2024-02-15
申请号：US18271189
申请日：2021-12-27
Inventor： Takehiko YAMAKAWA , Hiromu MATSUMOTO , Susumu NAKAMURA , Yutaka MIYAMOTO
CPC classification number: H02M3/3353 , H02M1/0009 , H02J7/007182 , H02J2207/20
Abstract: A power conversion apparatus is provided with: a plurality of power conversion circuits each provided with a transformer and supplying DC power to a common rechargeable battery; and a control circuit configured to control the plurality of power conversion circuits. When a load voltage of the rechargeable battery is equal to or higher than a first threshold, the control circuit selectively and sequentially operates the plurality of power conversion circuits such that one of the plurality of power conversion circuits is operated, and others of the plurality of power conversion circuits are stopped.
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公开(公告)号：US20180269796A1
公开(公告)日：2018-09-20
申请号：US15982605
申请日：2018-05-17
Inventor： Masahiro YAMAOKA , Takehiko YAMAKAWA , Motohiko FUJIMURA
IPC: H02M3/335
CPC classification number: H02M3/33592 , H02M1/00 , H02M3/337 , H02M2001/0009 , H02M2001/0058 , Y02B70/1433 , Y02B70/1475 , Y02B70/1491
Abstract: An electric power conversion device includes: a transformer including first and second windings magnetically coupled; a bridge circuit including a switch element; a rectifier circuit coupled to an output side of the transformer; a first resonant inductor; a second resonant inductor external to the transformer; and a resonant capacitor, wherein n1≥n2, Cr>C1, and Lr>L2 where Lr is an inductance value of the first resonant inductor and L2 is an inductance value including an inductance value of the second resonant inductor and an inductance value of a parasitic inductance component that is in series with the second winding in the pathway from the second winding to the rectifier circuit.
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