公开(公告)号：US20230396100A1

公开(公告)日：2023-12-07

申请号：US18235168

申请日：2023-08-17

Applicant: DENSO CORPORATION

Inventor： Masaya TAKAHASHI ,  Mitsuru SHIBANUMA ,  Kazuyuki KATO ,  Yusei NAKAYASHIKI ,  Eisuke TAKAHASHI ,  Nobuhisa YAMAGUCHI

IPC: H02J50/12 ,  H02J7/00 ,  H02J50/70 ,  H02J50/40

CPC classification number: H02J50/12 ,  H02J7/00712 ,  H02J50/402 ,  H02J7/0047 ,  H02J50/70

Abstract: A primary-side resonant circuit of a power transmission apparatus has an impedance varying element that increases, when supply of electric power is stopped, an input impedance of the primary-side resonant circuit so as to have predetermined standby current flowing through a primary-side coil. A power reception apparatus includes a magnetic flux amplifier circuit configured to amplify magnetic flux generated by the standby current flowing through the primary-side coil of the primary-side resonant circuit. The power transmission apparatus further includes a primary-side detection circuit configured to detect a change in the voltage of the primary-side coil, a change in electric current flowing through the primary-side coil or a change in a magnetic field in the vicinity of the primary-side coil; each of the changes is caused by the magnetic flux amplified by the magnetic flux amplifier circuit.

公开(公告)号：US20230387723A1

公开(公告)日：2023-11-30

申请号：US18232690

申请日：2023-08-10

Applicant: DENSO CORPORATION

Inventor： Masaya TAKAHASHI ,  Mitsuru SHIBANUMA ,  Kazuyuki KATO ,  Yusei NAKAYASHIKI ,  Eisuke TAKAHASHI ,  Nobuhisa YAMAGUCHI

IPC: H02J50/12 ,  H02J50/90 ,  H02J50/40 ,  B60L53/39

CPC classification number: H02J50/12 ,  H02J50/90 ,  H02J50/40 ,  B60L53/39

Abstract: A wireless power transmission system is provided which wirelessly transfer electric power from a power transmitter to a power receiver. The wireless power transmission system works to set a capacitance of a primary capacitor of a primary resonant circuit to undergo resonance with a self-inductance of a primary coil at an angular frequency that is an operating frequency. A tertiary capacitor of a tertiary resonant circuit has a capacitance set to undergo resonance with a self-inductance of a tertiary coil. A secondary capacitor of a secondary resonant circuit has a capacitance set to reduce a reactive component of ac power arising from self-inductances and mutual inductances of the primary coil, the secondary coil, and the tertiary coil.

公开(公告)号：US20220302766A1

公开(公告)日：2022-09-22

申请号：US17837583

申请日：2022-06-10

Applicant: DENSO CORPORATION

Inventor： Yuusei NAKAYASHIKI ,  Masaya TAKAHASHI

IPC: H02J50/50 ,  H02J50/12 ,  H02J50/05 ,  H02J50/40

Abstract: A contactless power supply system includes: a power transmitter including a first capacitor and a power transmission coil, and having a first resonant frequency; a power receiver including a second capacitor and a power reception coil, and having a second resonant frequency; and a repeater that transmits, to the power reception coil, AC power received from the power transmission coil. The repeater may include: a relay power reception coil unit that receives AC power and includes at least one coil that defines a first stray capacitance for forming a first self-resonant frequency having a frequency identical to the first resonant frequency; and a relay power transmission coil unit that transmits AC power and includes at least one coil that defines a second stray capacitance for forming a second self-resonant frequency having a frequency identical to the second resonant frequency.

公开(公告)号：US20220149666A1

公开(公告)日：2022-05-12

申请号：US17585195

申请日：2022-01-26

Applicant: DENSO CORPORATION ,  The University of Tokyo

Inventor： Hayato SUMIYA ,  Eisuke TAKAHASHI ,  Nobuhisa YAMAGUCHI ,  Masaya TAKAHASHI ,  Hiroshi FUJIMOTO ,  Osamu SHIMIZU

IPC: H02J50/50 ,  H02J50/12 ,  H02J50/00 ,  B60C19/00 ,  B60L53/122

Abstract: A dynamic wireless power transfer system includes a power transmission coil, a power transmission circuit, a power reception coil, a power reception circuit, and a relay circuit. The power transmission coil is provided in a road. The power transmission circuit supplies electric power to the power transmission coil. The power reception coil is provided in a vehicle. The power reception circuit is connected to the power reception coil. The relay circuit transfers electric power between the power transmission coil and the power reception coil in a contactless manner.

公开(公告)号：US20220011379A1

公开(公告)日：2022-01-13

申请号：US17483174

申请日：2021-09-23

Applicant: DENSO CORPORATION

Inventor： Kazuyoshi OBAYASHI ,  Masaya TAKAHASHI ,  Naoki KATAYAMA

IPC: G01R31/54 ,  G01R31/52 ,  G01R31/00 ,  H02J7/14

Abstract: A power supply system for moving body includes a first power source, a first current path, a second power source, a second current path. The first power source supplies electric power to a redundant load. The first current path connects the first power source and the redundant load. The second power source supplies electric power to the redundant load. The second current path connects the second power source and the redundant load.

公开(公告)号：US20180212510A1

公开(公告)日：2018-07-26

申请号：US15855168

申请日：2017-12-27

Applicant: DENSO CORPORATION

Inventor： Masaya TAKAHASHI ,  Eisuke TAKAHASHI ,  Takuya KIGUCHI

IPC: H02M1/08 ,  H02M7/5387 ,  H02J7/00

CPC classification number: H02M1/083 ,  H02J7/0065 ,  H02M7/53871 ,  H02M2001/0058 ,  H02M2007/4815 ,  H02P27/08

Abstract: A power conversion device has a main switch connected to a positive electrode side line of a battery, at least one semiconductor power element connected between the main switch and a negative electrode voltage line, and an auxiliary circuit having an auxiliary switch, a resonance reactor and an auxiliary diode connected parallel to the main switch. The device further has a voltage detection part which detects an external side voltage of the main switch and a control circuit part performing a switching control of the main switch and the auxiliary switch based on the detection result of the voltage detection part. During the turned-off state of the main switch, the control circuit part turns off the auxiliary switch before the external side voltage of the main switch reaches an input voltage of the main switch. This external side voltage starts to increase when the auxiliary switch is turned on.