公开(公告)号：US20220266703A1

公开(公告)日：2022-08-25

申请号：US17628700

申请日：2020-12-04

Applicant: TDK CORPORATION

Inventor： Akira GOTANI ,  Kazuki KONDO

IPC: B60L53/124 ,  H02J50/12 ,  H02J50/60 ,  H02J7/02

Abstract: A foreign object detection device includes a detection coil unit including a detection coil substrate (220) and a plurality of coils (242), which are mounted on a surface of the detection coil substrate (220) and each include a conductive pattern turned around the Z axis, and a detector (26) connected to the coils (242) to detect the existence of a foreign object on the basis of a vibration signal output when each of the coils (242) is excited. The coils (242) each define an opening. The detection coil substrate (220) has a through hole (228) extending through the detection coil substrate (220), and a component space for accommodating a switch (248) or a wiring pattern (250), within each of the openings of the coils (242) as seen in the Z-axis direction.

公开(公告)号：US20220037932A1

公开(公告)日：2022-02-03

申请号：US17365308

申请日：2021-07-01

Applicant: TDK CORPORATION

Inventor： Akira GOTANI

IPC: H02J50/60 ,  H02J50/12 ,  B60L53/124

Abstract: The detector of a foreign substance detection device determines the presence or absence of a foreign substance on the basis of the results of comparison between a value for comparison, based on an output value from a sensor, and threshold values. The threshold values include a first threshold value and a second threshold value that is greater than the first threshold value. The detector determines that the foreign substance is present when the number of times at which the value for comparison exceeds the first threshold value reaches the first number of times, and determines that the foreign substance is present when the number of times at which the value for comparison exceeds the second threshold value reaches the second number of times smaller than the first number of times.

公开(公告)号：US20220032792A1

公开(公告)日：2022-02-03

申请号：US17365257

申请日：2021-07-01

Applicant: TDK CORPORATION

Inventor： Akira GOTANI

IPC: B60L53/124 ,  B60L53/38

Abstract: A power transmission device that wirelessly transmits power to a vehicle, the power transmission device including an information emitter that, in a case in which the position of the vehicle acquired by the information acquirer is located in a power transmission range of the power transmission coil and, also, the instruction receiver receives the instruction about power transmission, emits a first type of information that indicates a presence of the foreign object when the detector detects the foreign object, and in a case in which the instruction receiver does not receive the instruction about power transmission even though the position of the vehicle acquired by the position information acquirer is located in the power transmission range of the power transmission coil, does not emit the information that indicates the presence of the foreign object.

公开(公告)号：US20190326787A1

公开(公告)日：2019-10-24

申请号：US16470911

申请日：2017-12-20

Applicant: TDK Corporation

Inventor： Kazuki KONDO ,  Kazunori OSHIMA ,  Akira GOTANI ,  Narutoshi FUKUZAWA

IPC: H02J50/60 ,  G01V3/10 ,  H02J50/12

Abstract: An object of the present invention is to improve the accuracy of detection of the metallic foreign object. A metallic foreign object detector includes a sensor part having at least one antenna coil that receives a magnetic field or current to generate a vibration signal, an integration circuit that acquires the integral value of a waveform of a signal corresponding to the vibration signal, and a determination circuit that determines the presence/absence of a metallic foreign object approaching the antenna coil based on the integral value and a criterion integral value which is the integral value obtained in the absence of the approaching metallic foreign object. The integral value and the criterion integral value are obtained by integrating the waveform having the same wavenumber.

公开(公告)号：US20140054972A1

公开(公告)日：2014-02-27

申请号：US13964179

申请日：2013-08-12

Applicant: TDK CORPORATION

Inventor： Akira GOTANI ,  Mitsunari SUZUKI

IPC: H01F38/14

CPC classification number: H01F38/14 ,  H02J5/005 ,  H02J7/025 ,  H02J50/12

Abstract: In a wireless power transmission system, a wireless power feeder supplies alternating current power from a power supply to a feeding coil at a resonant frequency f0 to generate an alternating current magnetic field of the resonant frequency f0. A receiving coil receives the power with the alternating current magnetic field of the resonant frequency f0. This received power is consumed in a load in a wireless power receiver. The impedance ratio between the receiving coil and the load, the quality factor of the feeding coil, and the quality factor of the receiving coil are appropriately set to keep high power transmission efficiency.

Abstract translation: 在无线电力传输系统中，无线电馈线以共振频率f0从电源向馈电线圈提供交流电力，以产生谐振频率f0的交流磁场。 接收线圈用共振​​频率f0的交流磁场接收电力。 该接收的功率在无线电力接收器中的负载中消耗。 接收线圈和负载之间的阻抗比，馈电线圈的品质因数以及接收线圈的品质因数被适当地设定以保持高功率传输效率。