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公开(公告)号：US20230155421A1
公开(公告)日：2023-05-18
申请号：US17620377
申请日：2021-01-19
Applicant: TDK CORPORATION
Inventor： Kazuki KONDO , Akira GOTANI , Masahide OHNISHI
IPC: H02J50/60 , H02J50/10 , B60L53/124
CPC classification number: H02J50/60 , H02J50/10 , B60L53/124
Abstract: A power transmission device wirelessly transmits electric power to a power reception device. A power transmission coil is configured by winding a conductive wire. A foreign object detection device detects a foreign object. Sensor coils are placed to cover the power transmission coil. A detector executes determination processing of determining existence of the foreign object on each of the sensor coils, based on a comparison result between a comparison target value based on output voltage output from one sensor coil of the sensor coils and a threshold value set to the one sensor coil. The detector executes threshold value change processing of changing the threshold value set to the one sensor coil on each of the sensor coils, based on induced voltage induced in the one sensor coil by magnetic flux generated by the power transmission coil.
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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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3.发明申请公开(公告)号：US20170288469A1
公开(公告)日：2017-10-05
申请号：US15472739
申请日：2017-03-29
Applicant: TDK CORPORATION
Inventor： Takuya MURASHIGE , Masahide OHNISHI , Masayuki SUGASAWA , Masayuki KOBAYASHI
CPC classification number: H02J50/60 , B60L53/12 , H01F27/02 , H01F27/2823 , H01F27/365 , H01F38/14 , H02J7/025 , H02J50/10 , H02J50/70
Abstract: A coil unit provided on a ground side, including a coil, at least one sensor for detecting an object existing above or around the coil unit, a housing for accommodating the coil and the at least one sensor, wherein, the housing is provided with a dividing plate and at least one pillar for maintaining the internal space of the space for sensor, the dividing plate divides the space into a space for coil and a space for sensor located vertically above the space for coil, the space for coil is for accommodating the coil and the space for sensor is for accommodating the at least one sensor, and the at least one sensor is disposed on the dividing plate without contacting with an upper inner surface portion of the housing in the space for sensor.
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公开(公告)号：US20150145346A1
公开(公告)日：2015-05-28
申请号：US14555188
申请日：2014-11-26
Applicant: TDK CORPORATION
Inventor： Masahide OHNISHI , Takeshi KAMONO
Abstract: The present invention provides a contactless power transmission circuit which is capable of narrowing a fluctuation extent of an output voltage output by a over receiving coil via a rectifier circuit. The contactless power transmission circuit controls a period of an alternating voltage output from a driving circuit based on a smaller one of either of a first command value and a second command value. Here, the first command value is one based on a difference between a detected value of the output voltage from the rectifier circuit and a target value. The second command value is one calculated based on a difference between a detected value of a transmission current flowing through the power transmitting coil and a target value.
Abstract translation: 本发明提供一种能够通过整流电路使由过接收线圈输出的输出电压的波动范围变窄的非接触式电力传输电路。 非接触电力传输电路基于第一命令值和第二命令值中的任一个中的较小的一个来控制从驱动电路输出的交流电压的周期。 这里，第一指令值是基于来自整流电路的输出电压的检测值与目标值之间的差的值。 第二指令值是基于流经电力发送线圈的发送电流的检测值与目标值之间的差计算出的值。
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5.发明申请公开(公告)号：US20150001956A1
公开(公告)日：2015-01-01
申请号：US14315671
申请日：2014-06-26
Applicant: TDK Corporation
Inventor： Tsunehiro SAEN , Masahide OHNISHI , Ryo MIYAZAWA
IPC: H04B5/00
CPC classification number: H04B5/0037 , H02J1/04 , H02J5/005 , H02J7/025 , H02J50/12 , H02J2001/002 , H04B5/0075
Abstract: To provide a wireless power receiving device, and a wireless power transmission device capable of improving the reliability of a protection circuit while preventing breakage of a circuit element upon occurrence of any abnormality, such as overvoltage or overcurrent. A wireless power receiving device includes a power receiving coil; a rectifier unit that performs full-wave rectification of the power received by the power receiving coil and supplies the power to a load; power-receiving-side detecting unit that detects an output voltage value or an output current value from the rectifier unit; and switching unit that short-circuits one of two current paths through the rectifier unit if the value detected by the power-receiving-side detecting unit exceeds a predetermined reference value.
Abstract translation: 提供一种无线电力接收装置和能够提高保护电路的可靠性的无线电力传输装置，同时防止在出现诸如过电压或过电流的任何异常时电路元件断裂。 无线电力接收装置包括：受电线圈; 整流单元，其对由所述受电线圈接收的功率进行全波整流，并向所述负载供电; 电力接收侧检测单元，其从所述整流器单元检测输出电压值或输出电流值; 以及如果由电力接收侧检测单元检测到的值超过预定的参考值，则将通过整流单元的两个电流路径中的一个短路的开关单元。
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Patent Agency Ranking
6.发明申请公开(公告)号：US20190304678A1
公开(公告)日：2019-10-03
申请号：US16367911
申请日：2019-03-28
Applicant: TDK CORPORATION
Inventor： Takuya MURASHIGE , Shoma ASAI , Masahide OHNISHI
Abstract: The coil unit includes a planar coil, a magnetic body and a capacitor module, the capacitor module has a substrate, capacitor elements mounted on the substrate, and a first connecting terminal and a second connecting terminal provided outside an element region on which capacitor elements are mounted, the first connecting terminal is provided inside a winding section as viewed in a plan view, the second connecting terminal is provided outside the winding section as viewed in a plan view, a direction in which the first connecting terminal and the second connecting terminal are connected is perpendicular to a direction in which the conductor extends in the winding section of the planar coil, the coil unit in which the element region is provided in a range overlapping the winding section of the coil as viewed in a plan view is selected.
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公开(公告)号：US20150001954A1
公开(公告)日：2015-01-01
申请号：US14312235
申请日：2014-06-23
Applicant: TDK CORPORATION
Inventor： Kazutaka TAMAKI , Masahide OHNISHI , Tadao SENRIUCHI
IPC: H04B5/00
CPC classification number: H04B5/0037 , B60L3/00 , B60L3/12 , B60L11/182 , H02J7/025 , H02J50/10 , Y02T10/7005 , Y02T10/7072 , Y02T90/122 , Y02T90/14
Abstract: A wireless power receiving device includes a voltage detection unit that detects an output voltage value of a rectifying unit, a power reduction unit that includes a switching element connected to a charging unit in parallel, and a control unit that controls operations of the switching element. In a case where the output voltage value detected by the voltage detection unit exceeds a first reference voltage value set in advance, the control unit controls and turns the switching element on by applying a voltage to the switching element, and controls the value of the voltage to be applied to the switching element so that the difference between the voltage value calculated on the basis of a current flowing in the switching element and a second reference voltage value set in advance decreases.
Abstract translation: 无线电力接收装置包括检测整流单元的输出电压值的电压检测单元，并联包括连接到充电单元的开关元件的功率降低单元和控制开关元件的动作的控制单元。 在由电压检测单元检测出的输出电压值超过预先设定的第一基准电压值的情况下，控制单元通过向开关元件施加电压来控制开关元件而使开关元件导通，并控制电压值 施加到开关元件，使得基于在开关元件中流动的电流计算出的电压值与预先设定的第二参考电压值之间的差异减小。
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公开(公告)号：US20190299800A1
公开(公告)日：2019-10-03
申请号：US16367004
申请日：2019-03-27
Applicant: TDK CORPORATION
Inventor： Ryo MIYAZAWA , Masahide OHNISHI
Abstract: A wireless power transmission device capable of preventing a lifespan of a capacitor that smooths a voltage rectified by a rectification circuit from being shortened, including a power transmission coil magnetically coupled to the power receiving coil, a rectification circuit that rectifies a supplied AC voltage, a first capacitor that smooths a voltage supplied from the rectification circuit into DC voltage, a power transmission circuit that converts the DC voltage smoothed by the first capacitor into AC voltage at a driving frequency, and a second capacitor that bypasses between two transmission paths connecting the circuits, the second capacitor is provided on the power transmission circuit side relative to the first capacitor between the rectification circuit and the power transmission circuit, and the device includes an inductor or rectification element between the first and second capacitor in the high potential side transmission path among the two transmission paths.
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9.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：US20180090995A1
公开(公告)日：2018-03-29
申请号：US15559173
申请日：2016-03-30
Applicant: TDK CORPORATION
Inventor： Kota ARASAKI , Masahide OHNISHI
CPC classification number: H02J50/12 , B60L11/182 , H02H9/041 , H02J7/025 , H02J50/80 , H02M3/33576
Abstract: A wireless power receiving device, for wirelessly receiving electric power from a wireless power feeding device, includes: a power receiving side resonant circuit having a power receiving coil wirelessly receiving power from a power feeding side and a power receiving side resonant capacitor; a rectifier circuit in which the power received by the power receiving coil is rectified to be output to a load; a power receiving side voltage detecting portion for detecting the output voltage of the rectifier circuit; a short circuit having a switching element connected between an output portion of the power receiving side resonant circuit and an output portion of the rectifier circuit, and a rectifying element inserted between the output portion of the power receiving side resonant circuit and the switching element; and a controlling circuit which operates the switching element when a value of the output voltage exceeds a preset reference voltage value.
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