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公开(公告)号：US11677255B1
公开(公告)日：2023-06-13
申请号：US17644005
申请日：2021-12-13
Applicant: Apple Inc.
Inventor： Ye Li , Antoin J. Russell , Stephen C. Terry , Adam L. Schwartz , Sumant Ranganathan , Gianpaolo Lisi
CPC classification number: H02J7/00711 , H02J50/12 , H02J50/70 , H02J50/80
Abstract: A wireless power transmitter can include a coil, an inverter coupled to the coil, and control circuitry coupled to the inverter that, responsive to receiving a burst request pulse from a wireless power receiver, initiates inverter operation, driving the coil and powering the receiver. The control circuitry can operate inverter switches so bandwidth of the wireless power transfer signal falls within a specified range by: (a) extending a minimum on time of the switches, (b) modifying pulse width modulation (PWM) drive signals supplied to the switches to shape a coil current burst envelope, and/or (c) modifying PWM signal amplitude supplied to the switches. Modifying the PWM drive signals can include using a symmetrical PWM scheme in which the positive and negative pulses are symmetrical in width on a cycle-by-cycle basis or using a complementary PWM scheme in which the positive and negative pulse widths are complementary on a cycle-by-cycle basis.
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公开(公告)号：US20220336143A1
公开(公告)日：2022-10-20
申请号：US17718854
申请日：2022-04-12
Applicant: Apple Inc.
Inventor： Zelin Xu , Sumant Ranganathan , Matthew J. Chabalko , Nan Liu , Eric X. Zhou
Abstract: The disclosure is directed to wireless power systems that include a ferromagnetic core formed of nanocrystalline material disposed on a ferrite. The wireless power systems can have reduced saturation and/or lossiness.
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公开(公告)号：US10310667B2
公开(公告)日：2019-06-04
申请号：US14860364
申请日：2015-09-21
Applicant: Apple Inc.
Inventor： Alexandre Gourevitch , Albert Lin , Isaac Chan , Martin Paul Grunthaner , Prathit Bugnait , Seyed Mohammad Navidpour , Sumant Ranganathan
IPC: G06F3/044 , G06F3/041 , G06F3/0354
Abstract: Electrode configurations for reducing wobble error for a stylus translating on a surface of a touch sensor panel is disclosed. Electrodes associated with a more linear signal profile can correlate to lower wobble error. In some examples, electrodes can be configured such that the signal profile associated with each electrode is spread to be wider, and thus, more linear. In some configurations, electrodes can include two or more bars extending along the length of the electrode with each bar electrically connected to one another at one or both ends. Bars can be of non-uniform width or spacing. Some configurations can include a “split bar,” which can divide a bar lengthwise in order to improve optical uniformity. In some examples, electrodes can include projections which can interleave with corresponding projections in adjacent electrodes.
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公开(公告)号：US10006828B2
公开(公告)日：2018-06-26
申请号：US14749571
申请日：2015-06-24
Applicant: Apple Inc.
Inventor： Manu Agarwal , John Stephen Smith , Sumant Ranganathan
CPC classification number: G01L25/00 , G01L1/2281 , G06F3/0414 , G06F3/0418
Abstract: Systems and methods for accurately and precisely measuring the resistance of a resistive sensor of a matched resistive sensor pair disposed on opposite surfaces of a substrate. Certain embodiments include coupled each sensor of the matched resistive sensors to a thermally-isolated pair of reference resistors contained within an integrated circuit so as to form a Wheatstone bridge. A controller associated with the integrated circuit can adjust the resistance of the thermally-isolated pair of reference resistors until the ratio of resistances matches to the ratio of resistances between the sensors of the matched pair.
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Patent Agency Ranking
公开(公告)号：US09880664B2
公开(公告)日：2018-01-30
申请号：US14864351
申请日：2015-09-24
Applicant: Apple Inc.
Inventor： Manu Agarwal , Jason C. Hu , Dhaval Patel , Shahrooz Shahparnia , Sumant Ranganathan
CPC classification number: G06F3/0418 , G06F3/0414 , G06F3/044 , G06F2203/04106
Abstract: Noise in sensor panel measurements can be reduced using a common pixel correction algorithm. Noise can be introduced into touch or force sensor panel measurements, for example, by circuitry of a transmit (Tx) section or a receive (Rx) section coupled to one or more sensing nodes of a sensor panel. For example, a digital-to-analog converter in the transmit section or an analog-to-digital converter in the receive section can introduce low-frequency correlated noise. Additionally, transmit and receive sections can introduce uncorrelated noise into the system. Reference nodes, coupled between Tx and Rx sections, can sense correlated and uncorrelated noise from the Tx and Rx sections. The noise measured at reference nodes can be subtract from signals measured at other sensing nodes coupled to the same Rx channel. The measurement at the reference node can be scaled using a scaling parameter to account for differences between reference nodes and sensing nodes.
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公开(公告)号：US20160377501A1
公开(公告)日：2016-12-29
申请号：US14749571
申请日：2015-06-24
Applicant: Apple Inc.
Inventor： Manu Agarwal , John Stephen Smith , Sumant Ranganathan
CPC classification number: G01L25/00 , G01L1/2281 , G06F3/0414 , G06F3/0418
Abstract: Systems and methods for accurately and precisely measuring the resistance of a resistive sensor of a matched resistive sensor pair disposed on opposite surfaces of a substrate. Certain embodiments include coupled each sensor of the matched resistive sensors to a thermally-isolated pair of reference resistors contained within an integrated circuit so as to form a Wheatstone bridge. A controller associated with the integrated circuit can adjust the resistance of the thermally-isolated pair of reference resistors until the ratio of resistances matches to the ratio of resistances between the sensors of the matched pair.
Abstract translation: 用于准确和精确地测量布置在基板的相对表面上的匹配电阻传感器对的电阻传感器的电阻的系统和方法。 某些实施例包括将匹配的电阻式传感器的每个传感器耦合到集成电路中包含的热隔离的一对参考电阻器，以便形成惠斯通电桥。 与集成电路相关联的控制器可以调节热隔离的一对参考电阻器的电阻，直到电阻比与匹配对的传感器之间的电阻比匹配。
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公开(公告)号：US20230170717A1
公开(公告)日：2023-06-01
申请号：US18154383
申请日：2023-01-13
Applicant: Apple Inc.
Inventor： Ye Li , Antoin J. Russell , Stephen C. Terry , Adam L. Schwartz , Sumant Ranganathan , Gianpaolo Lisi
CPC classification number: H02J7/00711 , H02J50/80 , H02J50/70 , H02J50/12
Abstract: A wireless power transmitter can include a coil, an inverter coupled to the coil, and control circuitry coupled to the inverter that, responsive to receiving a burst request pulse from a wireless power receiver, initiates inverter operation, driving the coil and powering the receiver. The control circuitry can operate inverter switches so bandwidth of the wireless power transfer signal falls within a specified range by: (a) extending a minimum on time of the switches, (b) modifying pulse width modulation (PWM) drive signals supplied to the switches to shape a coil current burst envelope, and/or (c) modifying PWM signal amplitude supplied to the switches. Modifying the PWM drive signals can include using a symmetrical PWM scheme in which the positive and negative pulses are symmetrical in width on a cycle-by-cycle basis or using a complementary PWM scheme in which the positive and negative pulse widths are complementary on a cycle-by-cycle basis.
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公开(公告)号：US11561647B2
公开(公告)日：2023-01-24
申请号：US16924047
申请日：2020-07-08
Applicant: Apple Inc.
Inventor： Yingxuan Li , Weijun Yao , Vivek Pant , Martin Paul Grunthaner , Marduke Yousefpor , Sumant Ranganathan
IPC: G06F3/041 , G06F3/044 , G06F3/0354
Abstract: A touch sensor panel is disclosed. In some examples, the touch sensor panel comprises a plurality of touch node electrodes. In some examples, the touch sensor panel comprises a touch controller configured to drive and sense the plurality of touch node electrodes in a fully bootstrapped configuration to obtain a fully bootstrapped touch image, drive and sense the plurality of touch node electrodes in a second configuration, different from the fully bootstrapped configuration, to obtain a second touch image, the second touch image including an effect of water on the touch sensor panel, and determine a final touch image based on the fully bootstrapped touch image and the second touch image, the final touch image not including the effect of the water on the touch sensor panel. In some examples, the second configuration comprises a mutual capacitance configuration. In some examples, the second configuration comprises a partially bootstrapped configuration.
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公开(公告)号：US11159054B2
公开(公告)日：2021-10-26
申请号：US16513583
申请日：2019-07-16
Applicant: Apple Inc.
Inventor： Christopher M. Pinciuc , Dmitry Berdnikov , Jukka-pekka J. Sjoeroos , Sumant Ranganathan , Weihong Qiu , Zaki Moussaoui
Abstract: A power system has a wireless power transmitting device and a wireless power receiving device. Coils in the transmitting device may include a circular coil overlapped by first and second rectangular coils at a charging surface. The rectangular coils each include straight segments extending over a central region of the circular coil. Control circuitry can activate the circular coil to transmit wireless power to a first type of wireless power receiving coil using vertical components of the magnetic field generated by the circular coil. The control circuitry can activate the rectangular coils to transmit wireless power to a second type of wireless power receiving coil using horizontal components of the magnetic field generated by the rectangular coils. The circular and rectangular coils wirelessly charge the power receiving device while located at the same position on the charging surface, regardless of the type of wireless power receiving coil that is used.
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