公开(公告)号：US11264843B1

公开(公告)日：2022-03-01

申请号：US17127419

申请日：2020-12-18

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Yong Seok Lim ,  Hae Yong Jung ,  Tai Gil Kwon ,  Yong Seong Kim ,  Yongju Park

IPC: H02J50/60 ,  H02J50/12 ,  H02J50/40 ,  B60L53/55 ,  B60L53/30 ,  B60L53/124

Abstract: The present invention provides a system tar wireless power transmission, wherein the system is a system for wireless power transmission detecting a foreign object, including a power transmitting coil for transmitting AC power, a power receiving coil for receiving the AC power transmitted from the power transmitting coil wherein the power receiving coil is spaced apart from the power transmitting coil, and a detection circuit for detecting a foreign object located between the power transmitting coil and the power receiving coil wherein a first resistor and a first detection coil connected in series, and a second resistor and a second detection coil connected in series are connected in parallel, and wherein at least one of the first detection coil and the second detection coil is disposed between the power transmitting coil and the power receiving coil.

公开(公告)号：US12199450B2

公开(公告)日：2025-01-14

申请号：US18058688

申请日：2022-11-23

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Yong Ju Park ,  Yong Seok Lim ,  Yong Seong Kim ,  Hae Yong Jung ,  Hye Jung Kim

IPC: G01C3/08 ,  G01V8/18 ,  H02J50/12 ,  H02J50/60

Abstract: A system for foreign object detection (FOD) in wireless power transfer is proposed. The system may include a balanced coil which is disposed between a transmitter coil and a receiver coil and which includes a Maxwell bridge circuit. The system may also include a temperature sensor configured to measure a temperature of the transmitter coil. The system may further include a processor configured to determine whether an FO is present between the transmitter coil and the receiver coil on the basis of voltage values detected at both ends of the bridge circuit. The FOD system can recognize the FO by finding a maximum resonant frequency at which a metal reacts using resonant frequency sweeping in a bridge circuit.

公开(公告)号：US20230387725A1

公开(公告)日：2023-11-30

申请号：US18058688

申请日：2022-11-23

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Yong Ju Park ,  Yong Seok Lim ,  Yong Seong Kim ,  Hae Yong Jung ,  Hye Jung Kim

IPC: H02J50/60 ,  H02J50/12 ,  G01V8/18

CPC classification number: H02J50/60 ,  H02J50/12 ,  G01V8/18

Abstract: A system for foreign object detection (FOD) in wireless power transfer is proposed. The system may include a balanced coil which is disposed between a transmitter coil and a receiver coil and which includes a Maxwell bridge circuit. The system may also include a temperature sensor configured to measure a temperature of the transmitter coil. The system may further include a processor configured to determine whether an FO is present between the transmitter coil and the receiver coil on the basis of voltage values detected at both ends of the bridge circuit. The FOD system can recognize the FO by finding a maximum resonant frequency at which a metal reacts using resonant frequency sweeping in a bridge circuit.