公开(公告)号：US20210351620A1

公开(公告)日：2021-11-11

申请号：US17235207

申请日：2021-04-20

Applicant: Renesas Electronics America Inc.

Inventor： Gustavo Mehas ,  Changjae Kim ,  Nicholaus Smith ,  Pooja Agrawal

IPC: H02J50/10 ,  H02J50/80

Abstract: According to some embodiments, a wireless power transmitter is disclosed. The wireless power transmitter can include a plurality of transmission coils arranged to cover a charging area and coupled with a ferrite; a plurality of local power controllers, each of the plurality of local power controllers coupled to drive a subset of the plurality of transmission coils, each subset of the plurality of transmission coils including a plurality of the plurality of transmission coils; and a microcontroller unit (MCU) coupled to the plurality of local power controllers, the microcontroller unit including a MCU processor executing instructions to designate states of each of the plurality of transmission coils, the states including active, de-active, and selected for receiver detection, and executing instructions to transmit instructions to each of the plurality of local power controllers in accordance with the state designations.

公开(公告)号：US20240429754A1

公开(公告)日：2024-12-26

申请号：US18821148

申请日：2024-08-30

Applicant: Renesas Electronics America Inc.

Inventor： Chan Young Jeong ,  Tao Qi ,  Young Chul Ryu ,  Kwangmuk Choi ,  Pooja Agrawal ,  Krishal Jaswantsinh Solanki ,  Adnan Dzebic

IPC: H02J50/60 ,  H02J50/10 ,  H02J50/80

Abstract: Systems, apparatuses, and methods for detecting a foreign object on a wireless power charging region are described. A circuit can detect an object inductively coupled to a wireless power transmitter. The circuit can further measure an input parameter prior to a power transfer stage, the input parameter can be one of an input current and an input power. The circuit can further compare the measured input parameter with a predetermined value. The circuit can further determine whether the object is a foreign object or the wireless power receiver based on a result of the comparison between the measured input parameter with the predetermined value.

公开(公告)号：US11495996B2

公开(公告)日：2022-11-08

申请号：US17235207

申请日：2021-04-20

Applicant: Renesas Electronics America Inc.

Inventor： Gustavo Mehas ,  Changjae Kim ,  Nicholaus Smith ,  Pooja Agrawal

IPC: H02J50/10 ,  H02J50/80

Abstract: According to some embodiments, a wireless power transmitter is disclosed. The wireless power transmitter can include a plurality of transmission coils arranged to cover a charging area and coupled with a ferrite; a plurality of local power controllers, each of the plurality of local power controllers coupled to drive a subset of the plurality of transmission coils, each subset of the plurality of transmission coils including a plurality of the plurality of transmission coils; and a microcontroller unit (MCU) coupled to the plurality of local power controllers, the microcontroller unit including a MCU processor executing instructions to designate states of each of the plurality of transmission coils, the states including active, de-active, and selected for receiver detection, and executing instructions to transmit instructions to each of the plurality of local power controllers in accordance with the state designations.

公开(公告)号：US20210143688A1

公开(公告)日：2021-05-13

申请号：US17073699

申请日：2020-10-19

Applicant: Renesas Electronics America Inc.

Inventor： Pooja Agrawal ,  Adnan Dzebic ,  Tao Qi ,  Steve Jaycox ,  Chan Young Jeong

IPC: H02J50/80 ,  H02J50/10 ,  H02J7/00

Abstract: A method of over-current protection in a wireless power receiver operating in a high-power mode includes digitally receiving an output current signal, generating an OC INT signal if the output current signal is greater than a current limit value, and if the OC INT signal is generated, transmitting Count A number of End Power Transfer (EPT) packets. If wireless power transmission has not stopped, transmitting Count C number of Control Error Packets (CEPs) with Value B. If wireless power transmission has not reduced such that the output current IL is below the current limit value, then enabling an LDO current limit circuit in a power block of the wireless power receiver. In a low-power mode, the receiver enables a hardware over-current circuit that generates an OC INT signal when the output current exceeds a current limit.