Patents by Inventor Supriya Raveendra HEGDE
Supriya Raveendra HEGDE 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: 20230411928Abstract: An optical element is positioned in a holder over a laser light source. The optical element includes an electrical trace that is coupled between first and second pads. A sensing circuit that is also coupled to the first and second pads performs a voltage/current sensing operation to detect displacement of the optical element and control enablement of the laser light source.Type: ApplicationFiled: June 15, 2022Publication date: December 21, 2023Applicant: STMicroelectronics (Research & Development) LimitedInventors: Steven COLLINS, Graeme STORM, Supriya Raveendra HEGDE
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Patent number: 11658518Abstract: A wireless power circuit operable in transceiver mode and in Q-factor measurement mode includes a bridge rectifier having first and second inputs coupled to first and second terminals of a coil, and an output coupled to a rectified node. An excitation circuit coupled to the first terminal, in Q-factor measurement mode, drives the coil with a pulsed signal. A protection circuit couples the first terminal to a first node when in Q-factor measurement mode and decouples the first terminal when in transceiver mode. A controller causes the bridge rectifier to short the first and second terminals to ground during Q-factor measurement mode. A sensing circuit amplifies voltage at the first node to produce an output voltage, and in response to the voltage at the first node rising to cross a rising threshold voltage, digitizes the output voltage. The digitized output voltage is used in calculating a Q-factor of the coil.Type: GrantFiled: August 23, 2021Date of Patent: May 23, 2023Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Baranidharan Karuppusamy, Thet Mon Sann, Kien Beng Tan, Supriya Raveendra Hegde, Huiqiao He, Teerasak Lee
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Patent number: 11495995Abstract: A wireless power receiving circuit includes a transistor based rectifier receiving an AC input voltage, and control logic receiving an overvoltage signal. The control logic generates control signals for controlling turn on of transistors within the transistor based rectifier based upon the overvoltage signal so as to cause the transistor based rectifier to produce a rectified output voltage from the AC input voltage. A comparator compares the rectified output voltage to a reference voltage and asserts the overvoltage signal if the rectified output voltage is greater than the reference voltage. In response to assertion of the overvoltage signal, the control logic asserts the control signals to simultaneously turn on all transistors of the transistor based rectifier.Type: GrantFiled: August 27, 2020Date of Patent: November 8, 2022Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Supriya Raveendra Hegde, Chee Weng Cheong
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Patent number: 11408923Abstract: A receiver circuit includes a rectifier operable in full-, half-synchronous and asynchronous modes. A measurement circuit, with method, provides for real-time power measurement within the rectifier. The measurements are made based on the average output current from the rectifier delivered to the load and measurements sampled over time of the instantaneous voltage at each input/output node of the rectifier. Equivalent resistance in the rectifier is determined from the measurements and power dissipation calculated from the determined equivalent resistance and the average output current. The instantaneous voltages are synchronously captured through high-voltage AC coupling in order to detect the voltage drop across each element of the rectifier. The sensed voltages are amplified in the low voltage domain and converted by a high-speed analog-to-digital converter in order to produce data useful in computing equivalent resistance values.Type: GrantFiled: September 10, 2020Date of Patent: August 9, 2022Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Yannick Guedon, Teerasak Lee, Supriya Raveendra Hegde
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Publication number: 20220103019Abstract: A wireless power circuit operable in transceiver mode and in Q-factor measurement mode includes a bridge rectifier having first and second inputs coupled to first and second terminals of a coil, and an output coupled to a rectified node. An excitation circuit coupled to the first terminal, in Q-factor measurement mode, drives the coil with a pulsed signal. A protection circuit couples the first terminal to a first node when in Q-factor measurement mode and decouples the first terminal when in transceiver mode. A controller causes the bridge rectifier to short the first and second terminals to ground during Q-factor measurement mode. A sensing circuit amplifies voltage at the first node to produce an output voltage, and in response to the voltage at the first node rising to cross a rising threshold voltage, digitizes the output voltage. The digitized output voltage is used in calculating a Q-factor of the coil.Type: ApplicationFiled: August 23, 2021Publication date: March 31, 2022Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Baranidharan KARUPPUSAMY, Thet Mon SANN, Kien Beng TAN, Supriya Raveendra HEGDE, Huiqiao HE, Teerasak LEE
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Patent number: 11271393Abstract: A wireless-power-system includes a bridge-rectifier having first and second inputs coupled to first and second terminals of a coil, and an output coupled to a rectified voltage node. An excitation circuit is coupled to the first input. A protection circuit has a first connection node capacitively coupled to the first terminal. The protection circuit, in Q-factor measurement mode, clamps the first connection node when the first input is coupled to ground, and connects the first connection node to the rectified voltage node when the first input is coupled to a supply voltage. The protection circuit, in wireless power mode, is acting as one leg of the rectifier. A pass gate circuit is coupled between the first connection node and a sense node, and a sensing circuit is coupled to the sense node and measures a Q-factor of the wireless power system when the protection circuit is in Q-factor measurement mode.Type: GrantFiled: August 31, 2020Date of Patent: March 8, 2022Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Supriya Raveendra Hegde, Yannick Guedon, Huiqiao He
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Publication number: 20220069570Abstract: A wireless-power-system includes a bridge-rectifier having first and second inputs coupled to first and second terminals of a coil, and an output coupled to a rectified voltage node. An excitation circuit is coupled to the first input. A protection circuit has a first connection node capacitively coupled to the first terminal. The protection circuit, in Q-factor measurement mode, clamps the first connection node when the first input is coupled to ground, and connects the first connection node to the rectified voltage node when the first input is coupled to a supply voltage. The protection circuit, in wireless power mode, is acting as one leg of the rectifier. A pass gate circuit is coupled between the first connection node and a sense node, and a sensing circuit is coupled to the sense node and measures a Q-factor of the wireless power system when the protection circuit is in Q-factor measurement mode.Type: ApplicationFiled: August 31, 2020Publication date: March 3, 2022Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Supriya Raveendra HEGDE, Yannick GUEDON, Huiqiao HE
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Patent number: 11251691Abstract: A high-side switching transistor of a rectifier circuit is driven by a high-side driver circuit to supply current to an output node. The high-side driver circuit is powered between a capacitive bootstrap node and the output node. A boot charge circuit charges the bootstrap capacitor by supplying current to the bootstrap node. The boot charge circuit includes: a first current path that selectively supplies a first charging current to the bootstrap node when the rectifier circuit is operating in a switching mode; and a second current path that selectively supplies a second charging current to the bootstrap node when the rectifier circuit is operating in a reset mode.Type: GrantFiled: September 3, 2020Date of Patent: February 15, 2022Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Supriya Raveendra Hegde, Yannick Guedon
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Patent number: 11152822Abstract: A wireless-power-circuit is operable in transceiver-mode and Q-factor-measurement-mode, and includes a bridge coupled to a coil, and having an output coupled to a rectified-voltage node. An excitation circuit, when in Q-factor-measurement-mode, drives the coil with a pulsed signal. A protection circuit couples the coil to a first node when in Q-factor-measurement-mode and decouples the coil from the first node when in transceiver-mode. A Q-factor sensing circuit includes an amplifier having inputs coupled to the first node and a common mode voltage (Vcm), and generating an output signal having an output voltage. A comparator generates a comparison output indicating Vcm crossing of a voltage at the first terminal of the coil, a processing circuit generating an enable signal based upon the comparison output, and an analog-to-digital-converter, when enabled, digitizing the output voltage for use in calculating a Q-factor of the coil.Type: GrantFiled: September 30, 2020Date of Patent: October 19, 2021Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Baranidharan Karuppusamy, Thet Mon Sann, Kien Beng Tan, Supriya Raveendra Hegde, Huiqiao He, Teerasak Lee
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Publication number: 20210091655Abstract: A high-side switching transistor of a rectifier circuit is driven by a high-side driver circuit to supply current to an output node. The high-side driver circuit is powered between a capacitive bootstrap node and the output node. A boot charge circuit charges the bootstrap capacitor by supplying current to the bootstrap node. The boot charge circuit includes: a first current path that selectively supplies a first charging current to the bootstrap node when the rectifier circuit is operating in a switching mode; and a second current path that selectively supplies a second charging current to the bootstrap node when the rectifier circuit is operating in a reset mode.Type: ApplicationFiled: September 3, 2020Publication date: March 25, 2021Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Supriya Raveendra HEGDE, Yannick GUEDON
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Publication number: 20210088567Abstract: A receiver circuit includes a rectifier operable in full-, half-synchronous and asynchronous modes. A measurement circuit, with method, provides for real-time power measurement within the rectifier. The measurements are made based on the average output current from the rectifier delivered to the load and measurements sampled over time of the instantaneous voltage at each input/output node of the rectifier. Equivalent resistance in the rectifier is determined from the measurements and power dissipation calculated from the determined equivalent resistance and the average output current. The instantaneous voltages are synchronously captured through high-voltage AC coupling in order to detect the voltage drop across each element of the rectifier. The sensed voltages are amplified in the low voltage domain and converted by a high-speed analog-to-digital converter in order to produce data useful in computing equivalent resistance values.Type: ApplicationFiled: September 10, 2020Publication date: March 25, 2021Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Yannick GUEDON, Teerasak LEE, Supriya Raveendra HEGDE
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Publication number: 20210091597Abstract: A wireless power receiving circuit includes a transistor based rectifier receiving an AC input voltage, and control logic receiving an overvoltage signal. The control logic generates control signals for controlling turn on of transistors within the transistor based rectifier based upon the overvoltage signal so as to cause the transistor based rectifier to produce a rectified output voltage from the AC input voltage. A comparator compares the rectified output voltage to a reference voltage and asserts the overvoltage signal if the rectified output voltage is greater than the reference voltage. In response to assertion of the overvoltage signal, the control logic asserts the control signals to simultaneously turn on all transistors of the transistor based rectifier.Type: ApplicationFiled: August 27, 2020Publication date: March 25, 2021Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Supriya Raveendra HEGDE, Chee Weng CHEONG
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Patent number: 10790791Abstract: A feedback stage for an integrator circuit is provided. The integrator receives a first input current and a second input current that include respective measurement current components and an offset current component. The integrator integrates the first input current and the second input current and generates a first output voltage and a second output voltage. The feedback stage including a transconductance amplifier detects a difference between the first output voltage and the second output voltage and sinks or sources a first output current and a second output current based on the difference between the first output voltage and the second output voltage. The first output current is additively combined with the first input current and the second output current is additively combined with the second input current to mitigate the offset current component at an input of the integrator.Type: GrantFiled: November 8, 2018Date of Patent: September 29, 2020Assignee: STMicroelectronics Asia Pacific PTE LtdInventors: Supriya Raveendra Hegde, Hugo Gicquel
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Publication number: 20200153399Abstract: A feedback stage for an integrator circuit is provided. The integrator receives a first input current and a second input current that include respective measurement current components and an offset current component. The integrator integrates the first input current and the second input current and generates a first output voltage and a second output voltage. The feedback stage including a transconductance amplifier detects a difference between the first output voltage and the second output voltage and sinks or sources a first output current and a second output current based on the difference between the first output voltage and the second output voltage. The first output current is additively combined with the first input current and the second output current is additively combined with the second input current to mitigate the offset current component at an input of the integrator.Type: ApplicationFiled: November 8, 2018Publication date: May 14, 2020Inventors: Supriya Raveendra HEGDE, Hugo GICQUEL