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公开(公告)号：US20190393732A1
公开(公告)日：2019-12-26
申请号：US16469498
申请日：2017-12-20
Applicant: TDK Corporation
Inventor： Kazunori OSHIMA , Akira GOTANI , Kazuki KONDO , Narutoshi FUKUZAWA
Abstract: An object of the present invention is to suppress deterioration in detection accuracy during power feeding in the detection of the metallic foreign object using the antenna coil. A metallic foreign object detector includes: an antenna coil; a capacitor that constitutes a resonance circuit RC together with the antenna coil; a power supply that applies voltage to the resonance circuit to generate a vibration signal in the resonance circuit; a determination circuit that determines the presence/absence of a metallic foreign object based on the waveform of the vibration signal; a resonance capacitor switch inserted into the resonance circuit; and a control circuit that controls the open/close state of the resonance capacitor switch. The control circuit brings the resonance capacitor switch into a closed state responding to the power supply starting application of voltage to the resonance circuit.
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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
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.
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公开(公告)号：US20140036547A1
公开(公告)日：2014-02-06
申请号：US13956643
申请日：2013-08-01
Applicant: TDK Corporation
Inventor： Ken MATSUURA , Kazunori OSHIMA , Hiroshige YANAGI
IPC: H02M3/335
CPC classification number: H02M3/33507 , H02M3/3376 , H02M2001/0058 , Y02B70/1491
Abstract: A power supply device includes a control unit performing PFM control for a switching element, a voltage detection unit detecting an output voltage of a converter, and a signal generation circuit. The control unit calculates a first control command value based on the output voltage, calculates a new first control command value adjusting the output voltage to a target voltage, calculates a difference value therebetween, and outputs a voltage, which has a polarity corresponding to the difference value, for a first output period corresponding to the difference value. The signal generation circuit generates a pulse signal in which a frequency increases or decreases in accordance with a first command value voltage corresponding to a charged voltage at a storage element according to the new first control command value. The switching element is driven by the pulse signal that has a finer adjustment unit frequency.
Abstract translation: 电源装置包括对开关元件执行PFM控制的控制单元，检测转换器的输出电压的电压检测单元和信号生成电路。 控制单元基于输出电压计算第一控制指令值，计算将输出电压调整为目标电压的新的第一控制指令值，计算出其间的差值，并输出与差值相对应的极性的电压 值，对应于差值的第一输出周期。 根据新的第一控制指令值，信号发生电路根据对应于存储元件的充电电压的第一指令值电压产生频率增加或减小的脉冲信号。 开关元件由具有更精细的调整单位频率的脉冲信号驱动。
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公开(公告)号：US20230305640A1
公开(公告)日：2023-09-28
申请号：US18103197
申请日：2023-01-30
Applicant: TDK CORPORATION
Inventor： Kazunori OSHIMA , Masayuki SUGASAWA , Tatsuya HAYASHI , Kouichi SAKITA
IPC: G06F3/023
CPC classification number: G06F3/0233
Abstract: Provided is an input device capable of facilitating an operation for inputting, a command such as characters. The input device includes an operation unit of which an operation amount is variable and a control unit. The control unit selects one command group among a plurality of command groups and decides on a command on the basis of the command group selected and the operation amount of the operation unit. The control unit switches the command group selected when the operation amount of the operation unit is in a prescribed range.
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公开(公告)号：US20200076246A1
公开(公告)日：2020-03-05
申请号：US16469063
申请日：2017-12-20
Applicant: TDK Corporation
Inventor： Narutoshi FUKUZAWA , Kazunori OSHIMA , Akira GOTANI , Kazuki KONDO
Abstract: A metallic foreign object detector, used in a wireless power transmission system that transmits power using an alternating magnetic field, includes antenna coils that generate a vibration signal by receiving a magnetic field or current, one or more capacitors that constitute a resonance circuit together with each of the antenna coils, and a detection part that detects a metallic foreign object by sequentially using the antenna coils. The detection part has detection modes that detect the presence/absence of the metallic foreign object based on changes in mutually different characteristics of the resonance circuit. The detection part selects one mode from the detection modes in accordance with at least one of the power feeding state of the wireless power transmission system and the position of each of the plurality of antenna coils and performs the detection of the metallic foreign object in the selected detection mode.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20190013691A1
公开(公告)日：2019-01-10
申请号：US16030324
申请日：2018-07-09
Applicant: TDK CORPORATION
Inventor： Kazunori OSHIMA , Hisashi OYAMA
Abstract: Disclosed herein is a wireless power receiving device that wirelessly receives power transmitted from a wireless power transmitting device. The wireless power receiving device comprises: a power receiving coil that receives an AC power through a magnetic field; a power-receiving-side capacitor that constitutes a resonance circuit together with the power receiving coil; a rectifying circuit that rectifies the AC power received by the power receiving coil by a plurality of bridge-connected semiconductor devices each having a rectifying function; and a short-circuit detection circuit that detects a short circuit in the rectifying circuit based on a first AC voltage which is a voltage between a one-side input line of the rectifying circuit and a stable potential and a second AC voltage which is a voltage between the other-side input line of the rectifying circuit and the stable potential.
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7.发明申请公开(公告)号：US20180375387A1
公开(公告)日：2018-12-27
申请号：US16015883
申请日：2018-06-22
Applicant: TDK CORPORATION
Inventor： Kazunori OSHIMA , Masahide OHNISHI
Abstract: Disclosed herein is a leakage detector provided in a device having a conversion circuit that converts a DC voltage and an AC voltage from one to the other and a grounded metal member. The leakage detector comprises: an average voltage detection circuit that detects the average voltage of voltages corresponding to a potential difference between a high-voltage-side terminal or a low-voltage-side terminal on the DC side of the conversion circuit and the metal member; and a leakage detection circuit that detects the presence/absence of a leakage based on the average voltage detected by the average voltage detection circuit.
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公开(公告)号：US20240112865A1
公开(公告)日：2024-04-04
申请号：US18464467
申请日：2023-09-11
Applicant: TDK CORPORATION
Inventor： Toshihiro IGUCHI , Daisuke YOSHIDA , Kazunori OSHIMA
Abstract: An electronic device includes an element body. The element body includes a first internal electrode layer, a second internal electrode layer, and a dielectric layer laminated between the first internal electrode layer and the second internal electrode layer. Ni oxide particles exist at a first boundary between the first internal electrode layer and the dielectric layer. The dielectric layer includes a dielectric large particle in contact with both of the Ni oxide particles at the first boundary and the second internal electrode layer.
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公开(公告)号：US20200091776A1
公开(公告)日：2020-03-19
申请号：US16470451
申请日：2017-12-20
Applicant: TDK Corporation
Inventor： Kazuki KONDO , Kazunori OSHIMA , Akira GOTANI , Narutoshi FUKUZAWA
Abstract: An object of the present invention is to reduce the possibility of failure in the detection of 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 a vibration time length measurement circuit that measures a vibration time length indicating the length of time required for the vibration of the vibration signal output from the sensor part corresponding to a predetermined wavenumber larger than 1, and a determination circuit that determines the presence/absence of a metallic foreign object approaching the antenna coil based on the vibration time length and a criterion vibration time length which is the vibration time length obtained in the absence of the approaching metallic foreign object.
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10.发明申请公开(公告)号：US20190386492A1
公开(公告)日：2019-12-19
申请号：US16469523
申请日：2017-12-20
Applicant: TDK Corporation
Inventor： Narutoshi FUKUZAWA , Akira GOTANI , Kazuki KONDO , Kazunori OSHIMA
Abstract: An object of the present invention is to improve detection accuracy of a metallic foreign object between a feeding coil and a receiving coil during wireless power feeding. A wireless power transmitting device is a device that performs power transmission by wireless using an alternating magnetic field vibrating at a predetermined power transmission frequency and includes a feeding coil, an antenna coil, a capacitor that constitutes a resonance circuit RC together with the antenna coil, a noise detection part that detects noise vibrating at a frequency higher than the power transmission frequency, and a foreign object detection part 140 that detects the presence/absence of a metallic foreign object based on a change in voltage or current generated in the resonance circuit RC and a noise detection result from the noise detection part.
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