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    SWITCHING AMPLIFIER HAVING LINEAR TRANSITION TOTEM POLE MODULATION
    2.
    发明申请
    SWITCHING AMPLIFIER HAVING LINEAR TRANSITION TOTEM POLE MODULATION 有权

    公开(公告)号：US20230098806A1

    公开(公告)日：2023-03-30

    申请号：US17491133

    申请日：2021-09-30

    Applicant: Texas Instruments Incorporated

    Inventor： Yinglai XIA ,  Yogesh Kumar RAMADASS

    IPC: H03G3/34 ,  H03F3/217

    Abstract: A switching amplifier includes a first portion of a power stage; a second portion of a power stage; a pulse-width modulation (PWM) control loop coupled to control inputs of the first portion of the power stage; and a linear amplifier coupled to control inputs of the second portion of the power stage. The PWM control loop controls a first switch and a second switch of the first portion of the power stage. Between current terminals of the first switch and the second switch is a first signal output of the switching amplifier. The linear amplifier controls a third switch and a fourth switch of the second portion of the power stage. Between current terminals of the third switch and the fourth switch is a second signal output of the switching amplifier.

    COMPENSATED ACTIVE ELECTRO-MAGNETIC INTERFERENCE FILTERS
    3.
    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.

    ACTIVE ELECTROMAGNETIC INTERFERENCE (EMI) FILTER FOR COMMON-MODE EMI REDUCTION
    4.
    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.

    OUTPUT CURRENT BOOSTING OF CAPACITOR-DROP POWER SUPPLIES
    6.
    发明申请
    OUTPUT CURRENT BOOSTING OF CAPACITOR-DROP POWER SUPPLIES 审中-公开

    公开(公告)号：US20190207513A1

    公开(公告)日：2019-07-04

    申请号：US16224457

    申请日：2018-12-18

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Yogesh Kumar RAMADASS ,  Jeffrey MORRONI

    IPC: H02M3/07 ,  H02M7/219 ,  H02M1/00

    Abstract: A capacitor-drop power supply includes a rectifier and a switched capacitor converter coupled to the rectifier. The rectifier is configured to receive an alternating current (AC) signal at an AC voltage and convert the AC signal into a rectified direct current (DC) signal at a rectified voltage. The switched capacitor converter is configured to receive the rectified DC signal and generate a converter output signal at a converter voltage that is proportional to the rectified voltage and that is less than the AC voltage.

    RAMP GENERATOR FOR MULTILEVEL CLASS-D AMPLIFIERS
    7.
    发明申请
    RAMP GENERATOR FOR MULTILEVEL CLASS-D AMPLIFIERS 审中-公开

    公开(公告)号：US20200304111A1

    公开(公告)日：2020-09-24

    申请号：US16360927

    申请日：2019-03-21

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Yogesh Kumar RAMADASS ,  Bhushan TALELE ,  Shailendra Kumar BARANWAL ,  Yinglai XIA ,  Junmin JIANG

    IPC: H03K4/08 ,  H03F3/217 ,  H02M3/07 ,  H03L7/099 ,  H03L7/081 ,  H03L7/093

    Abstract: A multi-level ramp generator comprises three ramp generators. The first ramp generator generates a first ramp signal, comprising a sawtooth voltage waveform with a first common mode voltage and a first peak to peak voltage. The second ramp generator generates a second ramp signal, comprising a sawtooth voltage waveform with a second common mode voltage and a second peak-to-peak voltage. The third ramp generator generates a third ramp signal, comprising a sawtooth voltage waveform with a third common mode voltage and the second peak-to-peak voltage. The second and third ramp signals are in phase with each other and the first ramp signal is 180° out of phase with the second and third ramp signals. In some implementations, each of the first, second, and third ramp generators comprise a respective delay locked loop and a respective voltage controlled oscillator.

    MAXIMUM POWER DETECTION AND AUTOMATIC GAIN CONTROL FOR CAPACITIVE CLASS-D AMPLIFIERS
    10.
    发明申请
    MAXIMUM POWER DETECTION AND AUTOMATIC GAIN CONTROL FOR CAPACITIVE CLASS-D AMPLIFIERS 有权

    公开(公告)号：US20220263478A1

    公开(公告)日：2022-08-18

    申请号：US17175789

    申请日：2021-02-15

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Junmin JIANG ,  Yinglai XIA ,  Yogesh Kumar RAMADASS ,  Shailendra Kumar BARANWAL

    IPC: H03F3/217 ,  H03G3/30

    Abstract: A system includes a charge pump having an input coupled to a first voltage and an output at a second voltage, the second voltage greater than the first voltage. The system also includes an amplifier having a first input, a second input, and a third input, the first input coupled to the output of the charge pump, the second input coupled to the first voltage, the third input coupled to an input signal, the amplifier having an amplified output signal. The system also includes a maximum power detector coupled to the amplifier, the maximum power detector operable to determine whether the amplified output signal has reached a threshold output level and to reduce a power of the amplified output signal responsive to the determination.

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