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

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

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.

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。

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.

公开(公告)号：US20190305613A1

公开(公告)日：2019-10-03

申请号：US16365236

申请日：2019-03-26

Applicant: TDK CORPORATION

Inventor： Kazunori OSHIMA ,  Ryo MIYAZAWA ,  Shinya OFUJI

IPC: H02J50/90 ,  H02J50/12

Abstract: A wireless power reception device that can detect a position of a power receiving coil relative to a power transmitting coil irrespective of a connection state of a load is provided. A wireless power reception device includes: a power receiving coil that is magnetically coupled to the power transmitting coil; a first rectifier circuit that rectifies an AC voltage supplied from the power receiving coil and outputs the rectified voltage to a load; a first capacitor connected between an 11th output terminal on the high potential side among output terminals included in the first rectifier circuit and a 12th output terminal on the low potential side among the output terminals included in the first rectifier circuit between the first rectifier circuit and the load; a second rectifier circuit that is connected to the power receiving coil in parallel to the first rectifier circuit and rectifies the AC voltage supplied from the power receiving coil; a second capacitor connected between a 21st output terminal on the high potential side among output terminals included in the second rectifier circuit and a 22nd output terminal on the low potential side among the output terminals included in the second rectifier circuit; a second voltage detecting circuit that detects a voltage between the 21st output terminal and the 22nd output terminal; and a position detecting circuit that detects a position of the power receiving coil relative to the power transmitting coil on the basis of the voltage detected by the second voltage detecting circuit.

公开(公告)号：US20190305612A1

公开(公告)日：2019-10-03

申请号：US16359967

申请日：2019-03-20

Applicant: TDK CORPORATION

Inventor： Kazunori OSHIMA ,  Ryo MIYAZAWA ,  Kenji FURUKAWA ,  Shinya OFUJI

IPC: H02J50/90 ,  H02J50/12

Abstract: A wireless power reception device detects a power receiving coil position relative to a power transmitting coil while curbing an increase in power loss. The wireless power reception device includes: a power receiving coil magnetically coupled to the power transmitting coil; a first rectification and smoothing circuit rectifying an AC voltage supplied from the power receiving coil and outputs the rectified AC voltage to a load; first and second capacitors respectively connected to first and second transmission lines; a first resistor having one terminal connected to the first capacitor and the other terminal is supplied with a predetermined reference potential; a second resistor having one terminal connected to the second capacitor and the other terminal is supplied with the reference potential; and a position detecting circuit detecting the power receiving coil position relative to the power transmitting coil on the basis of first and second junction point potentials.

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

IPC: H02J50/12 ,  H02M7/06 ,  H02M1/32

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.