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公开(公告)号：US20210152019A1
公开(公告)日：2021-05-20
申请号：US17092919
申请日：2020-11-09
Applicant: TDK CORPORATION
Inventor： Akihiro II
Abstract: A power supply circuit supplies AC power to a power-transmitting coil. A power-transmitting coil unit includes the power-transmitting coil and transmits AC power to a power receiving device. The power-transmitting coil unit executes first power transmission and second power transmission in which AC power received by the power receiving device is less than the AC power in the first power transmission and executes the second power transmission before executing the first power transmission.
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2.发明申请公开(公告)号：US20180159380A1
公开(公告)日：2018-06-07
申请号：US15830523
申请日：2017-12-04
Applicant: TDK Corporation
Inventor： Akihiro II
Abstract: Disclosed herein is a wireless power receiving device that includes a power receiving coil that takes in AC power via a magnetic field, and a rectifier that converts the AC power to DC power and outputs the DC power to a load. The rectifier includes a plurality of diodes bridge-connected to each other, the plurality of diodes including a first diode whose anode is connected to one input terminal of the rectifier and a second diode whose cathode is connected to the one input terminal of the rectifier; a first capacitor connected in parallel with the first diode; and a second capacitor connected in parallel with the second diode. Capacitances C1 and C2 of the first and second capacitor satisfy C1
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3.发明申请公开(公告)号：US20200286680A1
公开(公告)日：2020-09-10
申请号：US16806270
申请日：2020-03-02
Applicant: TDK CORPORATION
Inventor： Akihiro II
Abstract: A coil unit capable of inhibiting overheating in a magnetic body while the amount of the magnetic body used is reduced includes a magnetic body and a coil with an opening, the magnetic body overlaps the coil in a first direction and includes first, second, and third areas, the first area includes first and second faces, the second area includes third and fourth faces, the third area includes fifth and sixth faces, a first distance between the fifth face and the coil is shorter than a second distance between the second face and the coil and is longer than a third distance between the first face and the coil, a fourth distance between the third face and the coil is shorter than the first distance, and a fifth distance between the fourth face and the coil is longer than the third distance.
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公开(公告)号：US20150001953A1
公开(公告)日：2015-01-01
申请号：US14306659
申请日：2014-06-17
Applicant: TDK CORPORATION
Inventor： Narutoshi FUKUZAWA , Mitsunari SUZUKI , Akihiro II , Hiroshi SAIWAI
Abstract: A wireless power transmission device includes a power feeding unit and a power receiving unit. The power feeding unit and the power receiving unit are disposed so that a principal surface of a primary magnetic core and a principal surface of a secondary magnetic core face each other across a primary winding and a secondary winding. The distance from a surface of a feeding-side shield member which faces a feeding-side coil to a surface of the feeding-side coil which faces the feeding-side shield member, is longer than the distance from a surface of a receiving-side shield member which faces a receiving-side coil to a surface of the receiving-side coil which faces the receiving-side shield member.
Abstract translation: 无线电力传输装置包括供电单元和电力接收单元。 供电单元和受电单元被布置成使得主磁芯的主表面和次级磁芯的主表面在初级绕组和次级绕组上彼此面对。 从供电侧屏蔽部件的面向馈电侧线圈的表面到与馈电侧屏蔽部件相对的馈电侧线圈的表面的距离比从接收侧的面的距离长 屏蔽构件面向接收侧线圈的接收侧线圈的面向接收侧屏蔽构件的表面。
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Patent Agency Ranking
5.发明公开公开(公告)号：US20240128884A1
公开(公告)日：2024-04-18
申请号：US18465227
申请日：2023-09-12
Applicant: TDK CORPORATION
Inventor： Akihiro II
IPC: H02M3/335 , H02M1/00 , H02M7/5387
CPC classification number: H02M3/33592 , H02M1/0009 , H02M7/5387
Abstract: A switching control unit is applicable to an electric power conversion apparatus. The electric power conversion apparatus includes: a transformer; an inverter circuit including first switching devices; a synchronous rectifying circuit including second switching devices serving as rectifying devices; and a smoothing circuit. The switching control unit includes: a first current detection circuit detecting a peak current value of a secondary current; a second current detection circuit detecting an output current value; and a control circuit controlling respective operations of the first switching devices of the inverter circuit and respective operations of the second switching devices of the synchronous rectifying circuit. The control circuit sets a timing of switching from an on-state to an off-state of each of the second switching devices based on the peak current value detected by the first current detection circuit and the output current value detected by the second current detection circuit.
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公开(公告)号：US20180287434A1
公开(公告)日：2018-10-04
申请号：US15926412
申请日：2018-03-20
Applicant: TDK CORPORATION
Inventor： Akihiro II , Ryo Miyazawa
Abstract: Disclosed herein is a wireless power receiving device including a detection circuit that detects a circuit characteristic value of the power receiving circuit and a position detection circuit that detects a state of the relative position between the power receiving coil and the power transmitting coil. The position detection circuit determines that the power receiving coil exists near the periphery of a position suitable for receiving power when the circuit characteristic value exceeds a first threshold value set between the peak value of the second peak and a detection limit value of the detection circuit, and calculates transmittable power from the wireless power transmitting device based on the circuit characteristic value, when the circuit characteristic value detected by the detection circuit exceeds a second threshold value set between the peak value of the second peak and the peak value of the first peak.
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公开(公告)号：US20210001732A1
公开(公告)日：2021-01-07
申请号：US16486766
申请日：2018-03-01
Applicant: TDK CORPORATION
Inventor： Akihiro II , Ryo MIYAZAWA
IPC: B60L53/122 , H02J50/12 , H02J50/80 , H02J50/90
Abstract: A wireless power transmitting device transmits power by wireless to a wireless power receiving device through magnetic coupling between a feeding coil and a receiving coil and includes: a feeding circuit including a power conversion circuit that converts DC power into AC power of a drive frequency and a feeding coil unit including the feeding coil that receives the AC power supplied from the power conversion circuit to generate an AC magnetic field; and a control circuit Stu that controls the amount of magnetic flux generated from the feeding coil. The control circuit Stu calculates a separation distance between the feeding and receiving coils in their opposing direction from the circuit characteristic value of the wireless power transmitting device in a state where the amount of magnetic flux generated from the feeding coil is controlled so as to be constant.
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公开(公告)号：US20190165611A1
公开(公告)日：2019-05-30
申请号：US16202092
申请日：2018-11-28
Applicant: TDK Corporation
Inventor： Ryo MIYAZAWA , Masahide OHNISHI , Akihiro II
Abstract: A wireless power receiver is provided with a power reception unit, a rectifier circuit including first to fourth diodes and first and second capacitors and converting AC power into DC, an anode of the first diode and a cathode of the second diode being connected to one output end of the power reception unit, an anode of the third diode and a cathode of the fourth diode being connected to the other output end thereof, and first and second capacitors being connected in parallel, respectively, to the third and fourth diodes, a protection circuit including a first switching element connected between the other output end of the power reception unit and an output end of the rectifier circuit, and a control circuit that controls the first switching element based on output voltage of the rectifier circuit and inter-terminal voltage of the first or second capacitor.
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公开(公告)号：US20170279310A1
公开(公告)日：2017-09-28
申请号：US15461938
申请日：2017-03-17
Applicant: TDK CORPORATION
Inventor： Akihiro II , Kazunori OSHIMA , Yasuhiro OZAWA , Ken MATSUURA
IPC: H02J50/12
Abstract: A wireless power transmission system includes a power feeding device and a power receiving device, wherein the power feeding device includes: a power feeding coil which receives an electric power to generate an AC magnetic field; an inverter for supplying an alternating-current power under a predetermined driving frequency to the power feeding coil; a current detection circuit for detecting a peak value of an alternating current flowing in the power feeding coil; and a controller for controlling the alternating current flowing in the power feeding coil. The power receiving device includes: a power receiving coil for receiving electric power wirelessly via the AC magnetic field; a power receiving side resonance capacitor which configures a power receiving side LC resonance circuit together with the power receiving coil; and a rectifier for rectifying the electric power received by the power receiving coil.
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