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    ACTIVE ELECTROMAGNETIC INTERFERENCE (EMI) FILTER FOR COMMON-MODE EMI REDUCTION
    1.
    发明申请
    ACTIVE ELECTROMAGNETIC INTERFERENCE (EMI) FILTER FOR COMMON-MODE EMI REDUCTION 有权

    公开(公告)号：US20210313966A1

    公开(公告)日：2021-10-07

    申请号：US17223835

    申请日：2021-04-06

    Applicant: Texas Instruments Incorporated

    Inventor： Ashish KUMAR ,  Yongbin CHU ,  Yogesh Kumar RAMADASS

    IPC: H03H11/12 ,  H03H7/01

    Abstract: A system includes a conductive chassis having a first ground terminal. The conductive chassis couples to a switching circuit having a second ground terminal and having a first switching frequency. The second ground terminal is electrically isolated from the first ground terminal. An active electromagnetic interference (EMI) filter has an output and first and second inputs, and is configured to receive a first AC voltage having a second switching frequency at the first input, receive a second AC voltage having the second switching frequency at the second input referenced to the first ground terminal, sense noise having the first switching frequency on at least one of the first or second inputs, and generate an injection signal at the output based on the detected noise. The output couples to at least one of the first or second inputs.

    COMPENSATED ACTIVE ELECTRO-MAGNETIC INTERFERENCE FILTERS
    4.
    发明申请
    COMPENSATED ACTIVE ELECTRO-MAGNETIC INTERFERENCE FILTERS 审中-公开

    公开(公告)号：US20180295758A1

    公开(公告)日：2018-10-11

    申请号：US15715975

    申请日：2017-09-26

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Yongbin CHU ,  Jeffrey Anthony MORRONI ,  Yogesh Kumar RAMADASS

    IPC: H05K9/00 ,  H02M1/12 ,  H02M1/44

    CPC classification number: H02M1/44 ,  H02M1/12

    Abstract: An active electromagnetic interference (EMI) filter includes an amplifier configured to sense noise signals on a power conductor, and drive a cancellation signal onto the power conductor. The cancellation signal is to reduce the amplitude of the noise signals. Some embodiments of the active EMI filter include a high frequency compensation network that improves the high frequency phase margin of the active EMI filter and improves the stability of the active EMI filter at high frequencies. Some embodiments of the active EMI filter include a low frequency compensation capacitor that increases the phase margin of the active EMI filter at low frequencies. Some embodiments of the active EMI filter include low frequency compensation circuitry that increases the low frequency tolerance of the active EMI filter.

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