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公开(公告)号：US11616433B2
公开(公告)日：2023-03-28
申请号：US17223786
申请日：2021-04-06
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Ashish Kumar , Yogesh Kumar Ramadass , Manish Bhardwaj
Abstract: In a described example, a circuit includes a sensor, a controller and an amplifier. The sensor has a sensor input and a sensor output. The sensor input is adapted to be coupled to a chassis of a switch-mode power supply (SMPS). The controller has an input, a timing output and a level output. The input of the control circuit is coupled to the sensor output. The amplifier has a timing control input, a level control input and an amplifier output. The level control input is coupled to the level output of the controller. The timing control input is coupled to the timing output, and the amplifier output is coupled to the sensor input. The amplifier is configured to provide compensation pulses at the amplifier output having magnitude and timing to reduce common-mode noise on the chassis.
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公开(公告)号：US20210305893A1
公开(公告)日：2021-09-30
申请号：US17138660
申请日：2020-12-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Ashish Kumar , Haoquan Zhang , Yogesh Kumar Ramadass
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).
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公开(公告)号：US10965279B2
公开(公告)日：2021-03-30
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
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.
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公开(公告)号：US20200241071A1
公开(公告)日：2020-07-30
申请号：US16730047
申请日：2019-12-30
Applicant: Texas Instruments Incorporated
Inventor： Yogesh Kumar Ramadass
IPC: G01R31/3185 , G01R31/28 , G01R1/067 , G01R19/145 , G01R19/252
Abstract: An integrated circuit includes a semiconductor die having conductive pads and an electronic component with a first terminal coupled to a third conductive pad and a second terminal coupled to a fourth conductive pad. A resistor has a first terminal coupled to the fourth conductive pad and a second terminal coupled to the fifth conductive pad, and a first transistor has a first terminal coupled to the first conductive pad, a second terminal coupled to the fifth conductive pad, and a control terminal. A second transistor has a first terminal coupled to the first transistor, a second terminal coupled to the third conductive pad, and a control terminal. A pulse generator has an input coupled to the second conductive pad and an output coupled to the control terminal of the second transistor.
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公开(公告)号：US10581312B2
公开(公告)日：2020-03-03
申请号：US15859039
申请日：2017-12-29
Applicant: Texas Instruments Incorporated
Abstract: In described examples, a system regulates provision of DC-DC electrical power. The system includes a DC-DC converter, an input voltage node to receive an input voltage, a current source, a voltage source node, and a ground switch. The DC-DC converter includes a flying capacitor and multiple converter switches. The current source is coupled between the input voltage node and a top plate of the flying capacitor, to provide current to the top plate when the current source is activated by an activation voltage. The voltage source node is coupled to the input voltage node and to the current source, to provide the activation voltage to the current source, such that the activation voltage is not higher than a selected voltage between: a breakdown voltage of the converter switches; and a maximum value of the input voltage minus the breakdown voltage. The ground switch is coupled between a bottom plate of the flying capacitor and a ground.
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Patent Agency Ranking
公开(公告)号：US10536072B2
公开(公告)日：2020-01-14
申请号：US15944833
申请日：2018-04-04
Applicant: Texas Instruments Incorporated
Inventor： Nachiket Venkappayya Desai , Yogesh Kumar Ramadass
Abstract: A circuit includes a transformer configured with a primary winding and a secondary winding that are driven from a voltage supplied by a thermoelectric generator (TEG). The circuit includes a bipolar startup stage (BSS) coupled to the transformer to generate an intermediate voltage. The BSS includes a first transistor device coupled in series with the primary winding of the transformer to form an oscillator circuit with an inductance of the secondary winding when the voltage supplied by the TEG is positive. A second transistor device coupled to the secondary winding of the transformer enables the oscillator circuit to oscillate when the voltage supplied by the TEG is negative. After startup, a flyback converter stage can be enabled from the intermediate voltage to generate a boosted regulated output voltage.
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公开(公告)号：US10447158B2
公开(公告)日：2019-10-15
申请号：US15200793
申请日：2016-07-01
Applicant: Texas Instruments Incorporated
Inventor： Chih-Wei Chen , Yogesh Kumar Ramadass
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.
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公开(公告)号：US20190207505A1
公开(公告)日：2019-07-04
申请号：US15859039
申请日：2017-12-29
Applicant: Texas Instruments Incorporated
Abstract: In described examples, a system regulates provision of DC-DC electrical power. The system includes a DC-DC converter, an input voltage node to receive an input voltage, a current source, a voltage source node, and a ground switch. The DC-DC converter includes a flying capacitor and multiple converter switches. The current source is coupled between the input voltage node and a top plate of the flying capacitor, to provide current to the top plate when the current source is activated by an activation voltage. The voltage source node is coupled to the input voltage node and to the current source, to provide the activation voltage to the current source, such that the activation voltage is not higher than a selected voltage between: a breakdown voltage of the converter switches; and a maximum value of the input voltage minus the breakdown voltage. The ground switch is coupled between a bottom plate of the flying capacitor and a ground.
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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
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.
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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
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.
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