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公开(公告)号：US20240204551A1
公开(公告)日：2024-06-20
申请号：US18068338
申请日：2022-12-19
Applicant: Apple Inc.
Inventor： Vijay G Phadke
CPC classification number: H02J7/00714 , H02M3/073 , H02J2207/20
Abstract: A buck-fed current multiplier battery charging circuit can include a buck converter having an input configured to receive an input voltage and an output configured to deliver a regulated current, a current multiplier having an input configured to receive the regulated current from the buck converter and an output configured to deliver a multiple of the regulated current to a battery, wherein the current multiplier comprises one or more flying capacitor stages each including a resonant tank circuit; and controller circuitry coupled to the buck converter that operates switches of the buck converter to produce the regulated current and coupled to the current multiplier that operates switches of the current multiplier to deliver the multiple of the regulated current to the battery.
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公开(公告)号：US20230368961A1
公开(公告)日：2023-11-16
申请号：US17663543
申请日：2022-05-16
Applicant: Apple Inc.
Inventor： Balal Khan , Vijay G Phadke , Prudhvi Mohan Maddineni
CPC classification number: H01F27/2804 , H01F27/263 , H05K1/165 , H01F2027/2819
Abstract: A magnetic core for use with a printed circuit board transformer can include one or more inside corners of the magnetic core formed to include a curved channel that serves as a strain relief and facilitates positioning a printed circuit board within a core window defined by the core. The magnetic core can be an E-core. A center post of the E-core can define a notch configured to receive a complementary tab of a printed circuit board of the printed circuit board transformer. A center post of the E-core can be shorter than outside legs of the E-core, so that when assembled with an I-core a resulting core has an air gap. The core can be made of a ferrite material. A printed circuit board transformer can include a printed circuit board having one or more turns of a conductive trace disposed thereon and a magnetic core as described above.
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公开(公告)号：US20240204658A1
公开(公告)日：2024-06-20
申请号：US18068331
申请日：2022-12-19
Applicant: Apple Inc.
Inventor： Vijay G Phadke
CPC classification number: H02M3/07 , H02J7/007 , H02M1/14 , H02J2207/20
Abstract: A switched capacitor converter battery charging circuit can include an input that receives an input current, an output that delivers an integer multiple of the input current to a battery, a plurality of flying capacitor stages disposed between the input and output, and controller circuitry coupled to the flying capacitor stages that selectively enables or disables one or more of the flying capacitor stages to select the integer multiple responsive to a voltage supplied at the input. The flying capacitor stages can include a first plurality of flying capacitor stages forming a first phase of the converter and a second plurality of flying capacitor stages forming a second phase of the converter. The first and second phases can be operated in an interleaved manner to reduce current or voltage ripple. The converter can include three flying capacitor stages, providing for selection of integer multiples of 4×, 3×, 2×, or 1×.
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公开(公告)号：US20230368963A1
公开(公告)日：2023-11-16
申请号：US17663538
申请日：2022-05-16
Applicant: Apple Inc.
Inventor： Vijay G Phadke , Prudhvi Mohan Maddineni , Balal Khan
CPC classification number: H01F27/2823 , H01F27/24 , H05K1/18 , H05K1/115 , H01F27/2804 , H05K2201/1003
Abstract: A quasi-planar transformer can include a first winding comprising one or more turns of wire, a second winding comprising one or more turns of a conductive trace disposed on a printed circuit board, and a magnetic core positioned with respect to the first and second windings so as to provide a magnetic flux path coupling the first and second windings. The first winding can be a primary winding having a first half wound in a clockwise direction on a first side of the printed circuit board and a second half wound in a counterclockwise direction on a second side of the printed circuit board, wherein the first and second halves are formed of a single continuous wire. The single continuous wire can pass through an opening in the printed circuit board. The first and second halves of the primary winding can be secured to the printed circuit board.
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