Wireless Power System With Low Power Mode Switching

    公开(公告)号:US20190312459A1

    公开(公告)日:2019-10-10

    申请号:US16051350

    申请日:2018-07-31

    Applicant: Apple Inc.

    Abstract: A wireless power system has a wireless power transmitting device that uses an inverter to apply alternating-current signals to a coil. In response, the coil generates wireless power signals that are received by a coil in a wireless power receiving circuit of a wireless power receiving device. While wireless power is being transferred to the receiving device, the receiving device communicates with the wireless power transmitting device using in-band communications. The wireless power receiving device can issue a halt-wireless-power-transmission command using in-band communications to direct the wireless power transmitting device to stop transmitting wireless power. When power is not being transferred, the wireless power transmitting device transmits a series of short impulses that are monitored by the receiving device. The receiving device can direct the transmitting device to resume power transmission by adjusting an adjustable impedance circuit coupled to the wireless power receiving circuit.

    Inductive power transmitter
    2.
    发明授权

    公开(公告)号:US11190050B2

    公开(公告)日:2021-11-30

    申请号:US16213852

    申请日:2018-12-07

    Applicant: Apple Inc.

    Abstract: An inductive power transmitter is provided that includes a power transmitting coil which includes transmission circuitry coupled to the power transmitting coil. The inductive power transmitter is configured to produce an inductive power transfer (IPT) signal having an IPT power so that the power transmitting coil generates an IPT field to transfer wireless power to a power receiving coil of an inductive power receiver. The inductive power transmitter includes detection circuitry coupled to the transmission circuitry and is configured to detect one or more indications of a magnetic field strength of a leakage IPT field. The inductive power transmitter includes control circuitry configured to control the transmission circuitry while the transmission circuitry is increasing the IPT power towards a charge level sufficient to charge a battery associated with the inductive power receiver at a target charge rate.

    INDUCTIVE POWER TRANSMITTER
    5.
    发明申请

    公开(公告)号:US20200083746A1

    公开(公告)日:2020-03-12

    申请号:US16213852

    申请日:2018-12-07

    Applicant: Apple Inc.

    Abstract: An inductive power transmitter is provided that includes a power transmitting coil which includes transmission circuitry coupled to the power transmitting coil. The inductive power transmitter is configured to produce an inductive power transfer (IPT) signal having an IPT power so that the power transmitting coil generates an IPT field to transfer wireless power to a power receiving coil of an inductive power receiver. The inductive power transmitter includes detection circuitry coupled to the transmission circuitry and is configured to detect one or more indications of a magnetic field strength of a leakage IPT field. The inductive power transmitter includes control circuitry configured to control the transmission circuitry while the transmission circuitry is increasing the IPT power towards a charge level sufficient to charge a battery associated with the inductive power receiver at a target charge rate.

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