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公开(公告)号：US20240088794A1
公开(公告)日：2024-03-14
申请号：US18517386
申请日：2023-11-22
Inventor： Hiroyuki HOSOI , Hideki NAKATA
IPC: H02M3/335
CPC classification number: H02M3/33573 , H02M3/33576
Abstract: A DC-DC converter includes: a DC-AC conversion circuit that converts a DC input voltage into a primary AC voltage; a transformer including a primary coil to which the primary AC voltage is applied and generates a secondary AC voltage at a secondary coil; a rectifier circuit that outputs a rectified voltage obtained by full-wave rectifying the secondary AC voltage; a smoothing circuit that smooths the rectified voltage; and a control circuit that causes the rectifier circuit to perform rectification by a diode such that, in a free-wheeling period in which power of the input voltage is not transmitted to the transformer, a current does not flow via the rectifier circuit from a first intermediate terminal to a second intermediate terminal, the first and second intermediate terminals connected to the smoothing circuit, and a current flows via the rectifier circuit from the second intermediate terminal to the first intermediate terminal.
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Patent Agency Ranking
公开(公告)号：US20230299667A1
公开(公告)日：2023-09-21
申请号：US18165722
申请日：2023-02-07
Inventor： Hideki NAKATA , Atsushi SEKI , Junichi YUKAWA
CPC classification number: H02M1/44 , H02M3/155 , B60R16/02 , G01R31/282
Abstract: A noise reduction device according to one embodiment includes a noise reduction circuit and a failure diagnosis circuit. The noise reduction circuit generates an offset signal with reverse polarity of a noise component generated in a load. The failure diagnosis circuit detects a level of the offset signal. The failure diagnosis circuit determines whether or not a detected level of the offset signal deviates from an appropriate range. The failure diagnosis circuit diagnoses, on the basis of a determination result, whether or not a failure has occurred in the noise reduction circuit.
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公开(公告)号：US20220069699A1
公开(公告)日：2022-03-03
申请号：US17404229
申请日：2021-08-17
Inventor： Junichi YUKAWA , Zenyou TEI , Hiroyuki HANDA , Hideki NAKATA
Abstract: 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.
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公开(公告)号：US20220255453A1
公开(公告)日：2022-08-11
申请号：US17667324
申请日：2022-02-08
Inventor： Hideki NAKATA , Atsushi SEKI
Abstract: In a switching power supply device, a control circuit controls a first thyristor, a second thyristor, and a switching element according to an input voltage. The control circuit maintains the first thyristor in an on state while maintaining the second thyristor and the switching element in an off state in a first period in which the absolute amplitude value is equal to or less than a first threshold value within the latter half of a first half-cycle of the input voltage at startup, and maintains the second thyristor in an on state while maintaining the first thyristor and the switching element in an off state in a second period in which the absolute amplitude value is equal to or less than a second threshold value within the latter half of a second half-cycle of the input voltage at startup. The second half-cycle is the half-cycle following the first half-cycle.
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公开(公告)号：US20190009889A1
公开(公告)日：2019-01-10
申请号：US16118923
申请日：2018-08-31
Inventor： Masayuki TOYAMA , Hideki NAKATA , Hiroyuki MATSUMOTO
Abstract: An aircraft includes: a plurality of rotor units each of which includes a propeller, and a motor which drives the propeller; and a balloon to which the plurality of rotor units are connected and in which a gas less dense than air is contained. At least one rotor unit among the plurality of rotor units generates downward thrust.
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公开(公告)号：US20230396156A1
公开(公告)日：2023-12-07
申请号：US18453836
申请日：2023-08-22
Inventor： Hideki NAKATA , Atsushi SEKI
CPC classification number: H02M1/4233 , H02M1/36 , H02M7/1555 , H02M1/0085 , H02M7/125
Abstract: In a switching power supply device, a control circuit controls a first thyristor, a second thyristor, and a switching element according to an input voltage. The control circuit maintains the first thyristor in an on state while maintaining the second thyristor and the switching element in an off state in a first period in which the absolute amplitude value is equal to or less than a first threshold value within the latter half of a first half-cycle of the input voltage at startup, and maintains the second thyristor in an on state while maintaining the first thyristor and the switching element in an off state in a second period in which the absolute amplitude value is equal to or less than a second threshold value within the latter half of a second half-cycle of the input voltage at startup. The second half-cycle is the half-cycle following the first half-cycle.
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