Adaptive on-time generation for three-level power converters

    公开(公告)号:US11870345B2

    公开(公告)日:2024-01-09

    申请号:US17482287

    申请日:2021-09-22

    Applicant: Apple Inc.

    CPC classification number: H02M3/158 G06F1/28 H02M3/157 H02M1/0003

    Abstract: A power converter circuit included in a computer system may include multiple devices and a switch node coupled to a regulated power supply node via an inductor. During a first time period, the power converter charges a capacitor, and the couples the capacitor to the switch node during a second time period. During a third time period the power converter couples the switch node to an input power supply node. To maintain constant charge delivered to the load during each time the switch node is coupled to the input power supply node, the duration of the third time period is adjusted based on a voltage level of the input power supply node, a voltage level of the regulated power supply node, a value of the inductor, and the durations of first and second time periods.

    CAPACITIVE WIRELESS CHARGING FOR WIRELESS EARBUDS

    公开(公告)号:US20200351580A1

    公开(公告)日:2020-11-05

    申请号:US16930033

    申请日:2020-07-15

    Applicant: Apple Inc.

    Abstract: A case for a pair of earbuds including a housing having first and second cavities formed within the housing, the first cavity configured to receive a first earbud in the pair of earbuds and the second cavity configured to receive a second earbud in the pair of earbuds; a lid attached to the housing; a first pair of electrodes positioned within the housing adjacent to the first cavity; a second pair of electrodes positioned within the housing adjacent to the second cavity; and charging circuitry coupled to the first and second pairs of electrodes, the charging circuitry including a high frequency inverter configured to receive a DC power signal and output a high frequency AC signal to each of the first and second pairs of electrodes.

    CYCLE TRANSITIONS FOR BUCK CONVERTER CIRCUITS

    公开(公告)号:US20200280256A1

    公开(公告)日:2020-09-03

    申请号:US16290769

    申请日:2019-03-01

    Applicant: Apple Inc.

    Abstract: A voltage regulator circuit included in a computer system may include multiple devices and a switch node coupled to a regulated power supply node via an inductor. The voltage regulator circuit may charge a capacitor using an input power supply signal, and couple the capacitor to the switch node using respective subsets of the multiple devices, which are selected based on one or more control signals. A control circuit may generate the one or more control signals based on a particular switching sequence, which is selected based on a ratio of a voltage level of the regulated power supply node and a voltage level input power supply signal.

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