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    Symmetric split planar transformer
    3.
    发明授权
    Symmetric split planar transformer 有权

    公开(公告)号：US11631523B2

    公开(公告)日：2023-04-18

    申请号：US17100753

    申请日：2020-11-20

    Applicant: Analog Devices International Unlimited Company

    Inventor： Giovanni Frattini ,  Maurizio Granato ,  Pietro Giannelli ,  Keith W. Bennett

    IPC: H01F27/28 ,  H01F27/29 ,  H01F38/14 ,  H02M3/335

    Abstract: Disclosed herein is a symmetric split planar transformer in the context of a DC-DC isolated converter. The symmetric split planar transformer reduces or eliminates asymmetry in the distribution of parasitic capacitance across the isolation barrier going from one end to another end of a primary coil, and as a result, undesirable electromagnetic interference (EMI) due to common mode dipole emission across the isolation barrier may be reduced. In some embodiments, the primary winding is split into at least a first coil and a second coil, each occupying a different area side-by-side on a substrate. The transformer is symmetric in the sense that a capacitive coupling of the first coil to a secondary winding is the same as a capacitive coupling of the second coil to the secondary winding, such that common mode EMI may be reduced. Each coil may include stacked spiral coil portions in multiple metal planes to increase inductive density across the isolation barrier. Furthermore, in some embodiments the first and second coils may have opposite spiral directions such that far field radiation effect from the transformer may be reduced.

    SYMMETRIC SPLIT PLANAR TRANSFORMER
    4.
    发明申请
    SYMMETRIC SPLIT PLANAR TRANSFORMER 有权

    公开(公告)号：US20220165477A1

    公开(公告)日：2022-05-26

    申请号：US17100753

    申请日：2020-11-20

    Applicant: Analog Devices International Unlimited Company

    Inventor： Giovanni Frattini ,  Maurizio Granato ,  Pietro Giannelli ,  Keith W. Bennett

    IPC: H01F27/28 ,  H01F27/29 ,  H02M3/335 ,  H01F38/14

    Abstract: Disclosed herein is a symmetric split planar transformer in the context of a DC-DC isolated converter. The symmetric split planar transformer reduces or eliminates asymmetry in the distribution of parasitic capacitance across the isolation barrier going from one end to another end of a primary coil, and as a result, undesirable electromagnetic interference (EMI) due to common mode dipole emission across the isolation barrier may be reduced. In some embodiments, the primary winding is split into at least a first coil and a second coil, each occupying a different area side-by-side on a substrate. The transformer is symmetric in the sense that a capacitive coupling of the first coil to a secondary winding is the same as a capacitive coupling of the second coil to the secondary winding, such that common mode EMI may be reduced. Each coil may include stacked spiral coil portions in multiple metal planes to increase inductive density across the isolation barrier. Furthermore, in some embodiments the first and second coils may have opposite spiral directions such that far field radiation effect from the transformer may be reduced.

    SYMMETRIC SPLIT TRANSFORMER FOR EMI REDUCTION
    5.
    发明申请
    SYMMETRIC SPLIT TRANSFORMER FOR EMI REDUCTION 有权

    公开(公告)号：US20220165476A1

    公开(公告)日：2022-05-26

    申请号：US17100716

    申请日：2020-11-20

    Applicant: Analog Devices International Unlimited Company

    Inventor： Maurizio Granato ,  Giovanni Frattini ,  Pietro Giannelli ,  Keith W. Bennett

    IPC: H01F27/28 ,  H01F27/29 ,  H01F27/34 ,  H02M3/335

    Abstract: Disclosed herein is a symmetric transformer in the context of a DC-DC isolated converter. The symmetric transformer reduces or eliminates asymmetry in the distribution of parasitic capacitance across the isolation barrier going from one end to another end of a primary coil, and as a result, undesirable electromagnetic interference (EMI) due to common mode dipole emission across the isolation barrier may be reduced.
    In some embodiments, a primary winding is split into separate first and second coils, with a serial impedance connected in between the first and second coils. The transformer is symmetric in the sense that a capacitive coupling of the first coil to a secondary winding is the same as a capacitive coupling of the second coil to the secondary winding, such that common mode EMI may be reduced.

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