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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：US20230198305A1
公开(公告)日：2023-06-22
申请号：US17819668
申请日：2022-08-15
Applicant: Apple Inc.
Inventor： Zonghong Hu , Saining Ren , Shaoge Zang , Ho Fai Leung , Aiguo Hu , Qi Zhu , Botunga Arachchige Rajith Chaminda Abeywardana , Lei Zhao
Abstract: A capacitive power transfer system can include a power transmitter having one or more primary side filter components, a communications modulator, and transmitter capacitive couplers; and a power receiver having receiver capacitive couplers capacitively coupled to the transmitter capacitive couplers, one or more secondary side filter components, and a communication demodulator. The one or more primary side filter components and the one or more secondary side filter components can be selected to provide power amplifier operation at a power delivery frequency and act as a stable gain high pass filter above a communications cutoff frequency that is higher than the power delivery frequency.
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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：US11996698B2
公开(公告)日：2024-05-28
申请号：US17819668
申请日：2022-08-15
Applicant: Apple Inc.
Inventor： Shaoge Zang , Zonghong Hu , Saining Ren , Ho Fai Leung , Aiguo Hu , Qi Zhu , Botunga Arachchige Rajith Chaminda Abeywardana , Lei Zhao
Abstract: A capacitive power transfer system can include a power transmitter having one or more primary side filter components, a communications modulator, and transmitter capacitive couplers; and a power receiver having receiver capacitive couplers capacitively coupled to the transmitter capacitive couplers, one or more secondary side filter components, and a communication demodulator. The one or more primary side filter components and the one or more secondary side filter components can be selected to provide power amplifier operation at a power delivery frequency and act as a stable gain high pass filter above a communications cutoff frequency that is higher than the power delivery frequency.
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