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.

公开(公告)号：US20200373831A1

公开(公告)日：2020-11-26

申请号：US16989971

申请日：2020-08-11

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Yongbin CHU ,  Yogesh RAMADASS ,  Saurav BANDYOPADHYAY ,  Todd Allen TOPORSKI ,  Jeffrey Anthony MORRONI

IPC: H02M1/44 ,  H02M1/15

Abstract: An active electromagnetic interference (EMI) filter includes a first amplifier and a second amplifier. The first amplifier is configured to sense noise signals on a power conductor. The second amplifier is coupled to the first amplifier and is configured to drive a cancellation signal onto the power conductor. The cancellation signal is to reduce the amplitude of the noise signals sensed by the first amplifier. An output impedance of the second amplifier is lower than an output impedance of the first amplifier.

公开(公告)号：US20180294714A1

公开(公告)日：2018-10-11

申请号：US15715708

申请日：2017-09-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Yongbin CHU ,  Yogesh RAMADASS ,  Saurav BANDYOPADHYAY ,  Todd Allen TOPORSKI ,  Jeffrey Anthony MORRONI

IPC: H02M1/44 ,  H02M1/12 ,  H05K9/00

Abstract: An active electromagnetic interference (EMI) filter includes a first amplifier and a second amplifier. The first amplifier is configured to sense noise signals on a power conductor. The second amplifier is coupled to the first amplifier and is configured to drive a cancellation signal onto the power conductor. The cancellation signal is to reduce the amplitude of the noise signals sensed by the first amplifier. An output impedance of the second amplifier is lower than an output impedance of the first amplifier.