Patents by Inventor Baranidharan Karuppusamy
Baranidharan Karuppusamy 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: 20240088711Abstract: A method for operating a wireless power transmitter includes: receiving a power control command from a wireless power receiver; computing a potential voltage change for a transmitter voltage of the wireless power transmitter in accordance with a target transmitter power and a present value of a transmitter current of the wireless power transmitter; comparing the potential voltage change with a discrete step size of a supply voltage; and in response to determining that the magnitude of the potential voltage change is equal to or larger than the discrete step size of the supply voltage, adjusting the transmitter power by: adjusting the supply voltage by one or more discrete steps; and controlling a power conversion circuit of the wireless power transmitter using a target current value computed in accordance with the target transmitter power and the adjusted supply voltage.Type: ApplicationFiled: September 9, 2022Publication date: March 14, 2024Inventors: Baranidharan Karuppusamy, Abhay Jaisen Bhanushali
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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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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: 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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Patent number: 10558311Abstract: Disclosed herein is a touch screen controller for controlling touch sensing in a touch screen display, the touch screen display having a display layer controlled as a function of horizontal sync and vertical sync signals and a capacitive touch array comprised of drive lines and sense lines. The touch screen controller includes a driver and control circuitry. The control circuitry is configured to cause the driver to generate a driving signal on the drive lines during assertion of the horizontal sync signal, and cause the driver to generate the driving signal on the drive lines during assertion of the vertical sync signal. Analog touch sensing circuitry is configured to generate analog touch data as a function of signals on the sense lines resulting from generation of the drive signal on the drive lines.Type: GrantFiled: August 30, 2018Date of Patent: February 11, 2020Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Baranidharan Karuppusamy, Chaochao Zhang, Kusuma Adi Ningrat
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Patent number: 10185454Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.Type: GrantFiled: November 15, 2017Date of Patent: January 22, 2019Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Praveesh Chandran, Baranidharan Karuppusamy, Giuseppe Noviello, Chee Weng Cheong, Leonard Liviu Dinu, Dianbo Guo, Kien Beng Tan, Chaochao Zhang
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Publication number: 20180373364Abstract: Disclosed herein is a touch screen controller for controlling touch sensing in a touch screen display, the touch screen display having a display layer controlled as a function of horizontal sync and vertical sync signals and a capacitive touch array comprised of drive lines and sense lines. The touch screen controller includes a driver and control circuitry. The control circuitry is configured to cause the driver to generate a driving signal on the drive lines during assertion of the horizontal sync signal, and cause the driver to generate the driving signal on the drive lines during assertion of the vertical sync signal. Analog touch sensing circuitry is configured to generate analog touch data as a function of signals on the sense lines resulting from generation of the drive signal on the drive lines.Type: ApplicationFiled: August 30, 2018Publication date: December 27, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Baranidharan Karuppusamy, Chaochao Zhang, Kusuma Adi Ningrat
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Patent number: 10088965Abstract: Disclosed herein is a touch screen controller for controlling touch sensing in a touch screen display, the touch screen display having a display layer controlled as a function of horizontal sync and vertical sync signals and a capacitive touch array comprised of drive lines and sense lines. The touch screen controller includes a driver and control circuitry. The control circuitry is configured to cause the driver to generate a driving signal on the drive lines during assertion of the horizontal sync signal, and cause the driver to generate the driving signal on the drive lines during assertion of the vertical sync signal. Analog touch sensing circuitry is configured to generate analog touch data as a function of signals on the sense lines resulting from generation of the drive signal on the drive lines.Type: GrantFiled: December 16, 2016Date of Patent: October 2, 2018Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Baranidharan Karuppusamy, Chaochao Zhang, Kusuma Adi Ningrat
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Publication number: 20180173336Abstract: Disclosed herein is a touch screen controller for controlling touch sensing in a touch screen display, the touch screen display having a display layer controlled as a function of horizontal sync and vertical sync signals and a capacitive touch array comprised of drive lines and sense lines. The touch screen controller includes a driver and control circuitry. The control circuitry is configured to cause the driver to generate a driving signal on the drive lines during assertion of the horizontal sync signal, and cause the driver to generate the driving signal on the drive lines during assertion of the vertical sync signal. Analog touch sensing circuitry is configured to generate analog touch data as a function of signals on the sense lines resulting from generation of the drive signal on the drive lines.Type: ApplicationFiled: December 16, 2016Publication date: June 21, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Baranidharan Karuppusamy, Chaochao Zhang, Kusuma Adi Ningrat
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Publication number: 20180074619Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.Type: ApplicationFiled: November 15, 2017Publication date: March 15, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Praveesh Chandran, Baranidharan Karuppusamy, Giuseppe Noviello, Chee Weng Cheong, Leonard Liviu Dinu, Dianbo Guo, Kien Beng Tan, Chaochao Zhang
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Patent number: 9846520Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.Type: GrantFiled: June 7, 2017Date of Patent: December 19, 2017Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Praveesh Chandran, Baranidharan Karuppusamy, Giuseppe Noviello, Chee Weng Cheong, Leonard Dinu, Dianbo Guo, Kien Beng Tan, Chaochao Zhang
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Publication number: 20170269740Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.Type: ApplicationFiled: June 7, 2017Publication date: September 21, 2017Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Praveesh Chandran, Baranidharan Karuppusamy, Giuseppe Noviello, Chee Weng Cheong, Leonard Dinu, Dianbo Guo, Kien Beng Tan, Chaochao Zhang
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Patent number: 9703433Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.Type: GrantFiled: August 18, 2014Date of Patent: July 11, 2017Assignee: STMICROELECTRONICS ASIA PACIFIC PTE LTDInventors: Praveesh Chandran, Baranidharan Karuppusamy, Giuseppe Noviello, Chee Weng Cheong, Leonard Dinu, Dianbo Guo, Kien Beng Tan, Chaochao Zhang
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Publication number: 20160048234Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.Type: ApplicationFiled: August 18, 2014Publication date: February 18, 2016Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTDInventors: Praveesh Chandran, Baranidharan Karuppusamy, Giuseppe Noviello, Chee Weng Cheong, Leonard Dinu, Dianbo Guo, Kien Beng Tan, Chaochao Zhang