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公开(公告)号：US20240235274A1
公开(公告)日：2024-07-11
申请号：US18403385
申请日：2024-01-03
Inventor： Bruno Tisserand , Oliver Regenfelder , Laurent Regnier , Martin Rampetsreiter , Christoph Chlestil
Abstract: The present disclosure relates to an NFC device configured for wireless power transfer, the NFC device comprising an antenna, a frontend circuit coupled to the antenna, a microcontroller coupled to the frontend circuit, the microcontroller comprising an analog-to-digital converter. The analog-to-digital converter is configured to receive an analog amplitude and/or phase signal from the frontend circuit, and to convert the analog signal into a digital signal. The microcontroller is configured to process the digital signal in order to detect a variation in the amplitude and/or phase of the analog signal, so as to detect a change of impedance within the field of the NFC device.
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2.发明授权公开(公告)号：US11416692B2
公开(公告)日：2022-08-16
申请号：US17332405
申请日：2021-05-27
Applicant: STMicroelectronics Austria GmbH
Abstract: An embodiment method comprises transmitting a reader carrier signal from a contactless reader to a contactless device, receiving by the reader, a device modulated carrier signal from the device, the device modulated carrier signal having a carrier frequency, preferably turning off by the reader, the transmission of the reader carrier signal during reception of the device modulated carrier signal, and after having turned off the transmission of the reader carrier signal, determining by the reader the presence or the absence at the reader's antenna of a modulated carrier signal having at the reader's antenna the carrier frequency with a tolerance, without relying on the data content of the modulated carrier signal.
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3.发明申请公开(公告)号：US20210374365A1
公开(公告)日：2021-12-02
申请号：US17332405
申请日：2021-05-27
Applicant: STMicroelectronics Austria GmbH
Abstract: An embodiment method comprises transmitting a reader carrier signal from a contactless reader to a contactless device, receiving by the reader, a device modulated carrier signal from the device, the device modulated carrier signal having a carrier frequency, preferably turning off by the reader, the transmission of the reader carrier signal during reception of the device modulated carrier signal, and after having turned off the transmission of the reader carrier signal, determining by the reader the presence or the absence at the reader's antenna of a modulated carrier signal having at the reader's antenna the carrier frequency with a tolerance, without relying on the data content of the modulated carrier signal.
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