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公开(公告)号：US11218347B2
公开(公告)日：2022-01-04
申请号：US16891619
申请日：2020-06-03
Applicant: Renesas Electronics America Inc.
Inventor： Gustavo Mehas , Nicholaus Smith , Detelin Martchovsky
Abstract: In accordance with some embodiments of the present invention, a wireless power receiver that ramps an ASK impedance is presented. A method of amplitude shift key (ASK) modulation in a wireless power receiver includes initiating transition of an ASK impedance from a first state to a second state, the ASK impedance being coupled to a resonant circuit that includes a wireless power receive coil that receives a time-varying magnetic field; transitioning the ASK impedance from the first state to the second state according to the transition over a plurality of switching cycles of the time-varying magnetic field; and holding the second state.
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公开(公告)号：US11949229B2
公开(公告)日：2024-04-02
申请号：US16894346
申请日：2020-06-05
Applicant: Renesas Electronics America Inc.
Inventor： Gustavo Mehas , Nicholaus Smith , Tao Qi , Jiangjian Huang
Abstract: A wireless transmitter coordinates changes in the transmitter's input or output voltages with changes in the transmitter's operating frequency to counteract the transmitter's output power changes while changing the voltages. When the voltages are being increased, the output frequency is moved away from the resonant frequency. Consequently, the output power increase due to the increased voltages is restrained by the frequency change. Before or after the voltage increase, increased output power can be obtained by changing the output frequency while the input and output voltages are held constant or near constant. Some embodiments follow similar procedures when reducing the transmitter's input or output voltages. Calibration is performed before power transfer to determine suitable voltage and frequency profiles for voltage change operations. Other features are also provided.
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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
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.
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Patent Agency Ranking
4.发明授权公开(公告)号：US11728690B2
公开(公告)日：2023-08-15
申请号：US16915940
申请日：2020-06-29
Applicant: Renesas Electronics America Inc.
Inventor： Nicholaus Smith , Gustavo Mehas , Tao Qi
Abstract: A wireless power transmitter pulses the transmit power level unresponsively to the wireless power receiver's power requests in order to perform foreign object detection (FOD). The FOD is performed by the transmitter analyzing the receiver's responses to the pulsed power. Some embodiments avoid mistaking FOD for coil misalignment. Other features are also provided.
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公开(公告)号：US11228210B2
公开(公告)日：2022-01-18
申请号：US16810737
申请日：2020-03-05
Applicant: Renesas Electronics America Inc.
Inventor： Nicholaus Smith
Abstract: A system and method of transmitting power according to some embodiments includes sequentially pinging each of a plurality of transmit coils to locate a receiver; determining one or more active coils from the plurality of transmit coils based on the location of the receiver; activating the one or more active coils in a full-bridge mode to transfer power to the receiver; determining a base efficiency based on the one or more active coils; monitoring non-active ones of the plurality of transmit coils; determining if the receiver has moved based on the monitoring; if the receiver has moved to a new position, determining secondary coils according to the new position, and transitioning power to provide power from a new active coil configuration.
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公开(公告)号：US20210385114A1
公开(公告)日：2021-12-09
申请号：US16891619
申请日：2020-06-03
Applicant: Renesas Electronics America Inc.
Inventor： Gustavo Mehas , Nicholaus Smith , Detelin Martchovsky
Abstract: In accordance with some embodiments of the present invention, a wireless power receiver that ramps an ASK impedance is presented. A method of amplitude shift key (ASK) modulation in a wireless power receiver includes initiating transition of an ASK impedance from a first state to a second state, the ASK impedance being coupled to a resonant circuit that includes a wireless power receive coil that receives a time-varying magnetic field; transitioning the ASK impedance from the first state to the second state according to the transition over a plurality of switching cycles of the time-varying magnetic field; and holding the second state.
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公开(公告)号：US20210384722A1
公开(公告)日：2021-12-09
申请号：US16894346
申请日：2020-06-05
Applicant: Renesas Electronics America Inc.
Inventor： Gustavo Mehas , Nicholaus Smith , Tao Qi , Jiangjian Huang
Abstract: A wireless transmitter coordinates changes in the transmitter's input or output voltages with changes in the transmitter's operating frequency to counteract the transmitter's output power changes while changing the voltages. When the voltages are being increased, the output frequency is moved away from the resonant frequency. Consequently, the output power increase due to the increased voltages is restrained by the frequency change. Before or after the voltage increase, increased output power can be obtained by changing the output frequency while the input and output voltages are held constant or near constant. Some embodiments follow similar procedures when reducing the transmitter's input or output voltages. Calibration is performed before power transfer to determine suitable voltage and frequency profiles for voltage change operations. Other features are also provided.
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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
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.
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