Patents by Inventor Yogesh Kumar Ramadass
Yogesh Kumar Ramadass has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20200241071Abstract: 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.Type: ApplicationFiled: December 30, 2019Publication date: July 30, 2020Inventor: Yogesh Kumar Ramadass
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Patent number: 10727758Abstract: 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.Type: GrantFiled: December 19, 2018Date of Patent: July 28, 2020Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Yogesh Kumar Ramadass, Andres Arturo Blanco
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Publication number: 20200112246Abstract: 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.Type: ApplicationFiled: December 5, 2019Publication date: April 9, 2020Inventors: Nachiket Venkappayya Desai, Yogesh Kumar Ramadass
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Patent number: 10587206Abstract: A system includes a clamp circuit configured to regulate a converter input supply voltage based on control signals. The system also includes a converter configured to the adjust the converter input supply voltage to a converter output supply voltage. The system also includes a controller configured to adjust the control signals for the clamp circuit using a first mode based on the converter output supply voltage and a second mode based on the converter input supply voltage.Type: GrantFiled: January 25, 2019Date of Patent: March 10, 2020Assignee: Texas Instruments IncorporatedInventors: BoQiang Xiao, Andres Arturo Blanco, Yogesh Kumar Ramadass
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Patent number: 10581312Abstract: 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.Type: GrantFiled: December 29, 2017Date of Patent: March 3, 2020Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Yogesh Kumar Ramadass, Jeff Lee Nilles, Sombuddha Chakraborty, Farzad Sahandiesfanjani
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Publication number: 20200059165Abstract: A system includes a clamp circuit configured to regulate a converter input supply voltage based on control signals. The system also includes a converter configured to the adjust the converter input supply voltage to a converter output supply voltage. The system also includes a controller configured to adjust the control signals for the clamp circuit using a first mode based on the converter output supply voltage and a second mode based on the converter input supply voltage.Type: ApplicationFiled: January 25, 2019Publication date: February 20, 2020Inventors: BoQiang XIAO, Andres Arturo BLANCO, Yogesh Kumar RAMADASS
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Patent number: 10536072Abstract: 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.Type: GrantFiled: April 4, 2018Date of Patent: January 14, 2020Assignee: Texas Instruments IncorporatedInventors: Nachiket Venkappayya Desai, Yogesh Kumar Ramadass
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Patent number: 10447158Abstract: 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.Type: GrantFiled: July 1, 2016Date of Patent: October 15, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Chih-Wei Chen, Yogesh Kumar Ramadass
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Patent number: 10439482Abstract: In an embodiment, an adaptive drive strength switching converter includes a driver and a control loop coupled to the driver. In an embodiment, the control loop includes a peak detector, a comparator coupled to an output of the peak detector, a counter coupled to an output of the comparator, and a digital-to-analog converter (DAC) coupled to an output of the comparator.Type: GrantFiled: September 22, 2017Date of Patent: October 8, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Shailendra Kumar Baranwal, William Todd Harrison, Yogesh Kumar Ramadass
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Patent number: 10404175Abstract: In described examples, a DC-DC converter provides electrical power. In response to an input voltage falling below a high voltage operation threshold, the converter repeatedly performs a first normal (N) phase and a second N phase. The first N phase includes delivering power through an inductor from the input voltage. The second N phase includes coupling an input terminal of the inductor to a ground. In response to the input voltage rising above a normal operation threshold, the converter performs a first high voltage (HV) phase, then a second HV phase, then a third HV phase, then the second HV phase, and then repeats from the first HV phase. The first HV phase includes delivering power through the inductor from the input voltage and charging a flying capacitor. The second HV phase includes coupling the input terminal of the inductor to the ground. The third HV phase includes delivering power through the inductor by discharging the flying capacitor through the inductor.Type: GrantFiled: December 29, 2017Date of Patent: September 3, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Sombuddha Chakraborty, Jeffery Lee Nilles, Mervin John, Farzad Sahandiesfanjani, Yogesh Kumar Ramadass
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Patent number: 10374510Abstract: 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.Type: GrantFiled: September 26, 2017Date of Patent: August 6, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Yongbin Chu, Jeffrey Anthony Morroni, Yogesh Kumar Ramadass
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Publication number: 20190207513Abstract: 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.Type: ApplicationFiled: December 18, 2018Publication date: July 4, 2019Inventors: Yogesh Kumar RAMADASS, Jeffrey MORRONI
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Publication number: 20190207519Abstract: In described examples, a DC-DC converter provides electrical power. In response to an input voltage falling below a high voltage operation threshold, the converter repeatedly performs a first normal (N) phase and a second N phase. The first N phase includes delivering power through an inductor from the input voltage. The second N phase includes coupling an input terminal of the inductor to a ground. In response to the input voltage rising above a normal operation threshold, the converter performs a first high voltage (HV) phase, then a second HV phase, then a third HV phase, then the second HV phase, and then repeats from the first HV phase. The first HV phase includes delivering power through the inductor from the input voltage and charging a flying capacitor. The second HV phase includes coupling the input terminal of the inductor to the ground. The third HV phase includes delivering power through the inductor by discharging the flying capacitor through the inductor.Type: ApplicationFiled: December 29, 2017Publication date: July 4, 2019Inventors: Sombuddha Chakraborty, Jeffery Lee Nilles, Mervin John, Farzad Sahandiesfanjani, Yogesh Kumar Ramadass
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Publication number: 20190207532Abstract: 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.Type: ApplicationFiled: December 19, 2018Publication date: July 4, 2019Inventors: Yogesh Kumar RAMADASS, Andres Arturo BLANCO
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Publication number: 20190207505Abstract: 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.Type: ApplicationFiled: December 29, 2017Publication date: July 4, 2019Inventors: Yogesh Kumar Ramadass, Jeff Lee Nilles, Sombuddha Chakraborty, Farzad Sahandiesfanjani
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Publication number: 20190097517Abstract: In an embodiment, an adaptive drive strength switching converter includes a driver and a control loop coupled to the driver. In an embodiment, the control loop includes a peak detector, a comparator coupled to an output of the peak detector, a counter coupled to an output of the comparator, and a digital-to-analog converter (DAC) coupled to an output of the comparator.Type: ApplicationFiled: September 22, 2017Publication date: March 28, 2019Inventors: Shailendra Kumar BARANWAL, William Todd HARRISON, Yogesh Kumar RAMADASS
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Patent number: 10148312Abstract: 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.Type: GrantFiled: March 17, 2016Date of Patent: December 4, 2018Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Theodore Ernest Yu, Yogesh Kumar Ramadass
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Publication number: 20180295758Abstract: 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.Type: ApplicationFiled: September 26, 2017Publication date: October 11, 2018Inventors: Yongbin CHU, Jeffrey Anthony MORRONI, Yogesh Kumar RAMADASS
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Publication number: 20180226883Abstract: 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.Type: ApplicationFiled: April 4, 2018Publication date: August 9, 2018Inventors: Nachiket Venkappayya Desai, Yogesh Kumar Ramadass
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Patent number: 10009022Abstract: Embodiment of the inventive subject matter include an apparatus comprising a first switch, a second switch, a third switch, and a transistor. The first switch is coupled to a first voltage device and the transistor to selectively electrically connect the first voltage device to the transistor to provide a first charge to the transistor. The second switch is coupled to a second voltage device and the transistor to selectively electrically connect the second voltage device to the transistor to remove charge from the transistor. The third switch is coupled to the third voltage device and the transistor to selectively couple the third voltage device to the transistor to provide a second charge to the transistor.Type: GrantFiled: July 19, 2017Date of Patent: June 26, 2018Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Yogesh Kumar Ramadass