公开(公告)号：US20180006559A1

公开(公告)日：2018-01-04

申请号：US15200793

申请日：2016-07-01

Applicant: Texas Instruments Incorporated

Inventor： Chih-Wei Chen ,  Yogesh Kumar Ramadass

IPC: H02M3/158 ,  H02M1/08

CPC classification number: H02M3/158 ,  H02M1/08 ,  H02M1/36 ,  H02M7/483 ,  H02M2001/007

Abstract: A method for operating a multi-level converter is disclosed. A multi-level converter is provided with a plurality of switches connected in series and a flying capacitor connected to switch nodes of the plurality of switches, The switch nodes are biased initially to a fraction of an input voltage when the input voltage is initially applied to the plurality of switches. The flying capacitor is then precharged to a flying capacitor operating voltage. The multi-level converter is then operated after the flying capacitor is precharged by activating control signals to the plurality of switches. Diversion of precharge current by the plurality of switches may be performed while the flying capacitor is being precharged.

公开(公告)号：US20170272116A1

公开(公告)日：2017-09-21

申请号：US15072735

申请日：2016-03-17

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Theodore Ernest Yu ,  Yogesh Kumar Ramadass

IPC: H04B1/69

CPC classification number: H04B1/69 ,  H02M1/44 ,  H02M3/155 ,  H02M3/156

Abstract: A method of generating a spread spectrum signal is disclosed. The method includes selecting a first pseudorandom slope for a modulation curve. A current frequency on the modulation curve is selected. An oscillating signal is produced at the current frequency for a respective time. The current frequency is set to a next frequency on the modulation curve. The steps of producing an oscillating frequency and setting the current frequency to a next frequency are repeated until the current frequency is a final frequency on the modulation curve.

公开(公告)号：US20170126120A1

公开(公告)日：2017-05-04

申请号：US14926555

申请日：2015-10-29

Applicant: Texas Instruments Incorporated

Inventor： Sombuddha Chakraborty ,  Yogesh Kumar Ramadass

IPC: H02M3/158 ,  H02M1/08

CPC classification number: H02M3/158 ,  H02M1/08 ,  H02M3/06 ,  H02M3/156 ,  H02M3/1588 ,  H02M2001/0009 ,  H02M2003/072 ,  H02M2003/1566

Abstract: Switch mode power supplies and integrated circuits are presented to provide a DC output voltage signal using high and low side switches, with a switching control circuit to turn off the high side switch and engage an active shunt circuit to provide a reduced voltage to continue converter operation to accommodate high input voltage transients when the DC input voltage exceeds a threshold voltage without requiring an oversized low side switch for improved efficiency through reduced switching and conduction losses in normal operation.

公开(公告)号：US20240088878A1

公开(公告)日：2024-03-14

申请号：US18512158

申请日：2023-11-17

Applicant: Texas Instruments Incorporated

Inventor： Yinglai Xia ,  Shailendra Kumar Baranwal ,  Yogesh Kumar Ramadass ,  Junmin Jiang

IPC: H03K4/08 ,  H03F3/217 ,  H03L7/081 ,  H03L7/089 ,  H03L7/099

CPC classification number: H03K4/08 ,  H03F3/2173 ,  H03L7/081 ,  H03L7/0891 ,  H03L7/099 ,  H03F2200/03 ,  H03K19/20

Abstract: In one example, an apparatus comprises a power stage having a first power stage input, a second power stage input, and a power stage output. The apparatus also comprises a modulator circuit having a first ramp input, a second ramp input, a modulator input, a first modulator output, and a second modulator output, the first modulator output coupled to the first power stage input, and the second modulator output coupled to the second power stage input. The apparatus also comprises a multi-level ramp generator having a first ramp output and a second ramp output, the first ramp output coupled to the first ramp input, and the second ramp output coupled the second ramp input.

公开(公告)号：US11824543B2

公开(公告)日：2023-11-21

申请号：US17832280

申请日：2022-06-03

Applicant: Texas Instruments Incorporated

Inventor： Yinglai Xia ,  Shailendra Kumar Baranwal ,  Yogesh Kumar Ramadass ,  Junmin Jiang

IPC: H03K4/08 ,  H03L7/089 ,  H03L7/099 ,  H03F3/217 ,  H03L7/081 ,  H03K19/20

CPC classification number: H03K4/08 ,  H03F3/2173 ,  H03L7/081 ,  H03L7/0891 ,  H03L7/099 ,  H03F2200/03 ,  H03K19/20

Abstract: A device includes a first ramp generator having a first ramp generator output configured to provide a first ramp, a second ramp generator having a second ramp generator output configured to provide a second ramp, and a third ramp generator having a third ramp generator output configured to provide a third ramp. The first ramp is a sawtooth voltage waveform having a first common mode voltage and a first peak-to-peak voltage. The second ramp is a sawtooth voltage waveform having a second common mode voltage and a second peak-to-peak voltage. The third ramp is a sawtooth voltage waveform having a third common mode voltage and a third peak-to-peak voltage. A frequency of the second ramp is approximately equal to a frequency of the third ramp, and the frequency of the third ramp is approximately double a frequency of the first ramp.

公开(公告)号：US20230065567A1

公开(公告)日：2023-03-02

申请号：US17461495

申请日：2021-08-30

Applicant: Texas Instruments Incorporated

Inventor： Shailendra Kumar Baranwal ,  Yogesh Kumar Ramadass ,  Yinglai Xia

IPC: H03F3/217 ,  H03F1/02 ,  H04R3/00

Abstract: Described embodiments include an audio amplifier circuit that includes a first amplifier having a differential first amplifier input adapted to be coupled to an audio input source, a multiplexer having first and second mux inputs, a control input and a mux output. The first mux input is coupled to the differential amplifier output. There is a signal generator having a generator input coupled to the mux output. There is also a driver circuit having a driver circuit input and a driver circuit output, the driver circuit input coupled to the generator output, and a second amplifier having a first error input coupled to a current sense terminal that is configured to provide a voltage proportional to a current supplied from a power supply terminal, and a second error input coupled to a current limit terminal configured to provide a reference voltage proportional to a current limit value.

公开(公告)号：US11502619B1

公开(公告)日：2022-11-15

申请号：US17389926

申请日：2021-07-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Orlando Lazaro ,  Yogesh Kumar Ramadass ,  Nan Xing

IPC: H02M7/483 ,  H02M3/07 ,  H02M1/00

Abstract: A method includes charging a capacitor of a power inverter to a direct current (DC) input voltage provided at an input terminal of the power inverter. The capacitor has a first terminal and a second terminal. The method also includes providing a first voltage at an output terminal of the power inverter at a first time by controlling one of either a set of input switches configured to selectively couple the first and second terminals to either the input terminal or to a ground terminal, or an output switch configured to selectively couple the output terminal to either the first terminal or the second terminal. The method further includes providing a second voltage at the output terminal at a second time by controlling the other of the set of input switches and the output switch.

公开(公告)号：US11463000B2

公开(公告)日：2022-10-04

申请号：US17138660

申请日：2020-12-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Ashish Kumar ,  Haoquan Zhang ,  Yogesh Kumar Ramadass

IPC: H02M3/07 ,  G01D11/00 ,  H03M1/12 ,  H02J50/05

Abstract: Capacitively isolated current-loaded or current-driven charge pump circuits and related methods transfer electrical energy from a primary side to a secondary side over a capacitive isolation boundary, using a controlled current source to charge isolation capacitors with constant current, as opposed to current impulses, while maintaining output voltage within tolerance. The charge pump circuits provide DC-to-DC converters that can be used in isolated power supplies, particularly in low-power applications and in such devices as sensor transmitters that have separate electrical ground planes. The devices and methods transfer electrical energy over an isolated capacitive barrier in a manner that is efficient, inexpensive, and reduces electromagnetic interference (EMI).

公开(公告)号：US20210313891A1

公开(公告)日：2021-10-07

申请号：US16840087

申请日：2020-04-03

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sombuddha Chakraborty ,  Hakan Oner ,  Yogesh Kumar Ramadass

IPC: H02M3/158 ,  H02M3/157

Abstract: Described systems, methods, and circuitries use an interleaved multi-level converter to convert an input signal received at an input node into an output signal at an output node. In one example, a power conversion system includes a first multi-level switching circuit, a second multi-level switching circuit, and a control circuit. The first multi-level switching circuit and the second multi-level switching circuit are coupled to a switching node, the input node, and a reference node. The control circuit is configured to generate, based on the output signal, switching control signals as pulse width modulated signals having a duty cycle to control the output signal and provide the switching control signals to the first multi-level switching circuit and the second multi-level switching circuit.

公开(公告)号：US10727758B2

公开(公告)日：2020-07-28

申请号：US16225083

申请日：2018-12-19

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Yogesh Kumar Ramadass ,  Andres Arturo Blanco

IPC: H02M7/219 ,  H02M1/42 ,  H02M1/00

Abstract: A capacitor-drop power supply includes a rectifier and a rectifier controller. 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 rectifier includes a first low side switch. The rectifier controller is configured to generate a switch close signal based on the rectified DC signal. The switch close signal is configured to close the first low side switch shunting the AC signal to ground.