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公开(公告)号：US20240348104A1
公开(公告)日：2024-10-17
申请号：US18756178
申请日：2024-06-27
Applicant: Apple Inc.
Inventor： Shubha Ramakrishnan , Adam L. Schwartz , Jizhen Fu
Abstract: A wireless power transfer device can include a coil that couples to a corresponding coil of a counterpart device to facilitate wireless power transfer, a power converter coupled to the coil, and controller and communication circuitry that monitors one or more observable parameters associated with the wireless power transfer to detect a presence of a foreign object that is not the counterpart device and control the power converter responsive to detection of a foreign object. The controller and communication circuitry can perform foreign object detection based on power accounting that includes estimating friendly metal losses associated with the counterpart device. The controller and communication circuitry can receive from the counterpart device friendly metal loss modeling parameters associated with the counterpart device, the modeling parameters including one or more coefficients relating to a wireless power transfer current and one or more coefficients relating to a wireless power transfer voltage.
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公开(公告)号：US20230307961A1
公开(公告)日：2023-09-28
申请号：US18327721
申请日：2023-06-01
Applicant: Apple Inc.
Inventor： Adam L. Schwartz , Niloofar Rashidi Mehrabadi , Hossein Sepahvand
Abstract: A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device uses a wireless power transmitting coil to transmit wireless power signals to the wireless power receiving device. The wireless power transmitting device determines whether an external object is present. The external object may be a foreign object such as a coin or paperclip or may be a wireless power receiving device. External objects are detected using quality-factor measurements. Wireless communications are used to discriminate between foreign objects and wireless power receiving devices. Quality factor measurements may be compensated for aging and temperature effects using temperature measurements and compensation factors based on frequency and measured resistance.
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公开(公告)号：US20230170717A1
公开(公告)日：2023-06-01
申请号：US18154383
申请日：2023-01-13
Applicant: Apple Inc.
Inventor： Ye Li , Antoin J. Russell , Stephen C. Terry , Adam L. Schwartz , Sumant Ranganathan , Gianpaolo Lisi
CPC classification number: H02J7/00711 , H02J50/80 , H02J50/70 , H02J50/12
Abstract: A wireless power transmitter can include a coil, an inverter coupled to the coil, and control circuitry coupled to the inverter that, responsive to receiving a burst request pulse from a wireless power receiver, initiates inverter operation, driving the coil and powering the receiver. The control circuitry can operate inverter switches so bandwidth of the wireless power transfer signal falls within a specified range by: (a) extending a minimum on time of the switches, (b) modifying pulse width modulation (PWM) drive signals supplied to the switches to shape a coil current burst envelope, and/or (c) modifying PWM signal amplitude supplied to the switches. Modifying the PWM drive signals can include using a symmetrical PWM scheme in which the positive and negative pulses are symmetrical in width on a cycle-by-cycle basis or using a complementary PWM scheme in which the positive and negative pulse widths are complementary on a cycle-by-cycle basis.
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公开(公告)号：US12278503B2
公开(公告)日：2025-04-15
申请号：US18484885
申请日：2023-10-11
Applicant: Apple Inc.
Inventor： Adam L. Schwartz , Niloofar Rashidi Mehrabadi , Hossein Sepahvand
Abstract: A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device uses a wireless power transmitting coil to transmit wireless power signals to the wireless power receiving device. The wireless power transmitting device determines whether an external object is present. The external object may be a foreign object such as a coin or paperclip or may be a wireless power receiving device. External objects are detected using quality-factor measurements. Wireless communications are used to discriminate between foreign objects and wireless power receiving devices. Quality factor measurements may be compensated for aging and temperature effects using temperature measurements and compensation factors based on frequency and measured resistance.
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公开(公告)号：US20250096614A1
公开(公告)日：2025-03-20
申请号：US18774201
申请日：2024-07-16
Applicant: Apple Inc.
Inventor： Shubha Ramakrishnan , Adam L. Schwartz , Brandon R. Garbus , Herve Grabas , Srinivasa V. Thirumalai Ananthan Pillai
IPC: H02J50/60 , G01R21/133 , H02J50/10
Abstract: Transmitters and/or receivers in a wireless power transfer system predict power losses to account for presence of foreign objects.
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Patent Agency Ranking
公开(公告)号：US11984737B2
公开(公告)日：2024-05-14
申请号：US18336555
申请日：2023-06-16
Applicant: Apple Inc.
Inventor： Adam L. Schwartz , Alireza Safaee , Stephen C. Terry , Zhiyuan Hu
Abstract: A wireless charging system having a power transmitter may wirelessly transfer power to a power receiver. Shield saturation, such as saturation of a ferrite structure, in the wireless power receiver may occur under some operating conditions. Saturation can lead to disruptive oscillations in power transfer. The power transmitting may include control circuitry for detecting and mitigating saturation.
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公开(公告)号：US20230370115A1
公开(公告)日：2023-11-16
申请号：US18160532
申请日：2023-01-27
Applicant: Apple Inc.
Inventor： Adam L. Schwartz , Sriram Narayanan , Xing Zhou
CPC classification number: H04B5/0037 , H02J50/10 , H02J50/80 , H04B5/0031 , H04L27/06
Abstract: A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device may include ASK decoding circuitry. An inverter controller may supply control signals to an inverter based on a clock signal. To improve wireless transmission at various frequencies of interest, the clock signal used by the inverter controller may be dithered using a modulating signal. To mitigate bit errors in ASK decoding caused by the dithering of the clock signal in the wireless power transmitting device, ASK communication receiving circuitry in the wireless power transmitting device may receive information regarding the modulating signal used to dither the clock signal. The ASK communication receiving circuitry may receive a clock signal that has been dithered using the modulating signal, dither an analog-to-digital converter sampling rate using the modulating signal, or include notch filtering circuitry with parameters determined based on the modulating signal.
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公开(公告)号：US20240250561A1
公开(公告)日：2024-07-25
申请号：US18624598
申请日：2024-04-02
Applicant: Apple Inc.
Inventor： Adam L. Schwartz , Alireza Safaee , Stephen C. Terry , Zhiyuan Hu
Abstract: A wireless charging system having a power transmitter may wirelessly transfer power to a power receiver. Shield saturation, such as saturation of a ferrite structure, in the wireless power receiver may occur under some operating conditions. Saturation can lead to disruptive oscillations in power transfer. The power transmitting may include control circuitry for detecting and mitigating saturation.
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公开(公告)号：US20220320911A1
公开(公告)日：2022-10-06
申请号：US17681363
申请日：2022-02-25
Applicant: Apple Inc.
Inventor： Adam L. Schwartz , Ruiyang Lin , Shubha Ramakrishnan , Zaki Moussaoui , Weihong Qiu
Abstract: A wireless power system has a wireless power transmitting device with a wireless power transmitting coil and an inverter. The inverter and wireless power transmitting coil are used to transmit wireless power signals. The wireless power system also has a wireless power receiving device configured to receive the wireless power signals using a wireless power receiving coil. A rectifier in the wireless power receiving device rectifies alternating-current signals from the wireless power receiving coil and produces corresponding direct-current power. Power loss calculations may be used to help determine whether a foreign object might be present in the vicinity of a coupled wireless power transmitter and receiver. In an ecosystem with multiple models of transmitter and multiple models of receiver, model-dependent scaling factors may be maintained and exchanged between a given coupled transmitter and receiver pair to allow accurate power loss estimates to be made.
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公开(公告)号：US20210136550A1
公开(公告)日：2021-05-06
申请号：US16868077
申请日：2020-05-06
Applicant: Apple Inc.
Inventor： Adam L. Schwartz , Ron Rafer C. Floresca , Liang Chen , Zaki Moussaoui
Abstract: An electronic device such as a portable electronic device has wireless power receiving circuitry. A vehicle has a vehicle remote keyless system that transmits beacons. A key receives the beacons and responds with key codes to unlock doors and enable a vehicle ignition in the vehicle. In the presence of wireless power transfer operations there is a risk that wireless power signals will interfere with the reception of the beacons by the key. To ensure that beacons are satisfactorily received, conditions in which there is a risk of interference are detected and corresponding interference mitigation operations are performed.
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