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    Reduction of noise in touch data samples via sampling during porch time of Vsync and Hsync signals
    1.
    发明授权
    Reduction of noise in touch data samples via sampling during porch time of Vsync and Hsync signals 有权

    公开(公告)号：US10558311B2

    公开(公告)日：2020-02-11

    申请号：US16117277

    申请日：2018-08-30

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Baranidharan Karuppusamy ,  Chaochao Zhang ,  Kusuma Adi Ningrat

    IPC: G06F3/044 ,  G06F3/041

    Abstract: 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.

    Foreign objection detection sensing circuit for wireless power transmission systems
    2.
    发明授权
    Foreign objection detection sensing circuit for wireless power transmission systems 有权

    公开(公告)号：US11658518B2

    公开(公告)日：2023-05-23

    申请号：US17408824

    申请日：2021-08-23

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Baranidharan Karuppusamy ,  Thet Mon Sann ,  Kien Beng Tan ,  Supriya Raveendra Hegde ,  Huiqiao He ,  Teerasak Lee

    IPC: H02J50/60 ,  H02J50/12

    CPC classification number: H02J50/60 ,  H02J50/12

    Abstract: 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.

    POWER REGULATION IN WIRELESS POWER TRANSMITTER
    4.
    发明公开
    POWER REGULATION IN WIRELESS POWER TRANSMITTER 审中-公开

    公开(公告)号：US20240088711A1

    公开(公告)日：2024-03-14

    申请号：US17941199

    申请日：2022-09-09

    Applicant: STMicroelectronics Asia Pacific Pte Ltd. ,  STMicroelectronics International N.V.

    Inventor： Baranidharan Karuppusamy ,  Abhay Jaisen Bhanushali

    IPC: H02J50/10 ,  H02J7/00 ,  H02J50/80

    CPC classification number: H02J50/10 ,  H02J7/00711 ,  H02J7/00712 ,  H02J50/80 ,  H02J2207/20

    Abstract: 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.

    Foreign objection detection sensing circuit for wireless power transmission systems
    5.
    发明授权
    Foreign objection detection sensing circuit for wireless power transmission systems 有权

    公开(公告)号：US11152822B1

    公开(公告)日：2021-10-19

    申请号：US17037982

    申请日：2020-09-30

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Baranidharan Karuppusamy ,  Thet Mon Sann ,  Kien Beng Tan ,  Supriya Raveendra Hegde ,  Huiqiao He ,  Teerasak Lee

    IPC: H02J50/60 ,  H02J50/12

    Abstract: 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.

    SYSTEM AND METHOD OF COMMUNICATION BETWEEN A CAPACITIVE TOUCH SCREEN AND AN ACTIVE STYLUS
    7.
    发明申请
    SYSTEM AND METHOD OF COMMUNICATION BETWEEN A CAPACITIVE TOUCH SCREEN AND AN ACTIVE STYLUS 有权
    电容触摸屏和活动板之间的通信系统和方法

    公开(公告)号：US20160048234A1

    公开(公告)日：2016-02-18

    申请号：US14461977

    申请日：2014-08-18

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Praveesh Chandran ,  Baranidharan Karuppusamy ,  Giuseppe Noviello ,  Chee Weng Cheong ,  Leonard Dinu ,  Dianbo Guo ,  Kien Beng Tan ,  Chaochao Zhang

    IPC: G06F3/044 ,  G06F3/0354

    CPC classification number: G06F3/044 ,  G06F3/03545 ,  G06F3/0383 ,  G06F3/0416

    Abstract: 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.

    Abstract translation: 有源触笔电容耦合到用于通信的电容式触摸面板。 活动的笔在等待模式下操作以从面板接收初始通信。 响应于这样的接收，活动触针与实现时分复用的重复通信帧同步。 从活动手写笔到面板的通信包括：信息通信; 专用于面板的列和/或行的同步通信和通信。 从面板到活动手写笔的通信可以唯一地被寻址到手写笔，或者通常被发送到一组触控笔。

    REDUCTION OF NOISE IN TOUCH DATA SAMPLES VIA SAMPLING DURING PORCH TIME OF VSYNC AND HSYNC SIGNALS
    9.
    发明申请
    REDUCTION OF NOISE IN TOUCH DATA SAMPLES VIA SAMPLING DURING PORCH TIME OF VSYNC AND HSYNC SIGNALS 审中-公开

    公开(公告)号：US20180373364A1

    公开(公告)日：2018-12-27

    申请号：US16117277

    申请日：2018-08-30

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Baranidharan Karuppusamy ,  Chaochao Zhang ,  Kusuma Adi Ningrat

    IPC: G06F3/044 ,  G06F3/041

    CPC classification number: G06F3/044 ,  G06F3/0418

    Abstract: 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.

    Reduction of noise in touch data samples via sampling during porch time of Vsync and Hsync signals
    10.
    发明授权
    Reduction of noise in touch data samples via sampling during porch time of Vsync and Hsync signals 有权

    公开(公告)号：US10088965B2

    公开(公告)日：2018-10-02

    申请号：US15381489

    申请日：2016-12-16

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Baranidharan Karuppusamy ,  Chaochao Zhang ,  Kusuma Adi Ningrat

    IPC: G06F3/044 ,  G06F3/041

    Abstract: 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.

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