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公开(公告)号：US11967836B2
公开(公告)日：2024-04-23
申请号：US17883372
申请日：2022-08-08
Applicant: Apple Inc.
Inventor： Aiguo Patrick Hu , Bo Long , Qi Zhu , Wynand Malan , Patrin Illenberger , Andrew R Connell
Abstract: Metal object detection may be performed in a wireless power system by monitoring the 5th or other order harmonic current of a dual-frequency power transmitter driven by a voltage-fed inverter with square-wave output. While power transfer is maintained by tuning at the fundamental frequency, the transmitter circuit is tuned simultaneously at the 5th order frequency or other harmonic frequencies to increase or decrease the flow of the harmonic current for when a metal object is present. The receiver circuit may include a notch filter to filter out the 5th order frequency. With the dual-frequency tuning configuration, the presence of a metal object causes a significant drop of the increase in the harmonic current at the transmitter side while the receiver behaves as an open circuit with no effect on power transfer. The harmonic tuning circuit may be switched off as necessary to leave only the fundamental frequency for power transfer.
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公开(公告)号：US20250055325A1
公开(公告)日：2025-02-13
申请号：US18781091
申请日：2024-07-23
Applicant: Apple Inc.
Inventor： Jinqian Yu , William R Walitsch , Mikhal S De Jesus , Patrin Illenberger , Sherjeel Shehzad , Kevin J. Hartnett , Rex Jungho Hwang , Nan Liu , Kumar Modepalli , Kunal Bhargava , Oh Jae Lee
Abstract: A first wireless power system having a first transmit device and a first receive device is operable in close proximity to a second wireless power system having a second transmit device and a second receive device. Each transmit device includes a respective coil driven by an inverter and measurement circuitry that controls the power transmitting devices to promote coexistence of the nearby systems.
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公开(公告)号：US20230072541A1
公开(公告)日：2023-03-09
申请号：US17883372
申请日：2022-08-08
Applicant: Apple Inc.
Inventor： Aiguo Patrick Hu , Bo Long , Qi Zhu , Wynand Malan , Patrin Illenberger , Andrew R Connell
Abstract: Metal object detection may be performed in a wireless power system by monitoring the 5th or other order harmonic current of a dual-frequency power transmitter driven by a voltage-fed inverter with square-wave output. While power transfer is maintained by tuning at the fundamental frequency, the transmitter circuit is tuned simultaneously at the 5th order frequency or other harmonic frequencies to increase or decrease the flow of the harmonic current for when a metal object is present. The receiver circuit may include a notch filter to filter out the 5th order frequency. With the dual-frequency tuning configuration, the presence of a metal object causes a significant drop of the increase in the harmonic current at the transmitter side while the receiver behaves as an open circuit with no effect on power transfer. The harmonic tuning circuit may be switched off as necessary to leave only the fundamental frequency for power transfer.
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公开(公告)号：US10978918B1
公开(公告)日：2021-04-13
申请号：US16782464
申请日：2020-02-05
Applicant: Apple Inc.
Inventor： Saining Ren , Patrin Illenberger , Ho Fai Leung
Abstract: A wireless power transmitting device uses a wireless power transmitting coil to transmit wireless power signals to a wireless power receiving device. The wireless power transmitting coil is located in a housing. The housing has a circular outline and contains one or more magnets that couple to corresponding magnets in the wireless power receiving device to help align a wireless power receiving coil in the wireless power receiving device to the wireless power transmitting coil in the wireless power transmitting device. A circular array of capacitive sensor electrodes is supported by the housing at a location that overlaps the wireless power transmitting coil. Capacitive sensor measurements from the capacitive sensor array are analyzed to determine whether a foreign object such as a coin or paperclip is present between the housing and the wireless power receiving device.
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