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公开(公告)号：US12125631B2
公开(公告)日：2024-10-22
申请号：US16978924
申请日：2019-08-05
Applicant: Google LLC
Inventor： Chao Fei , Honggang Sheng , Douglas Osterhout , Liang Jia , Srikanth Lakshmikanthan
CPC classification number: H01F27/289 , H01F27/361 , H01F27/38 , H02M1/44 , H02M7/04
Abstract: Shielded electrical transformers and power converters using those transformers are disclosed. In some implementations, a shielded electrical transformer includes a magnetic core, a primary winding, a first secondary winding, and a second secondary winding. The transformer includes a first shielding winding that has a same voltage potential direction as the primary winding and is connected in series with the primary winding to carry current that passes through the primary winding. The transformer also includes a second shielding winding that has a voltage potential direction opposite the primary winding and is connected from primary ground to a floating terminal. The first secondary winding, the second secondary winding, the first shielding winding, and the second shielding winding can each have an approximately equal number of turns.
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公开(公告)号：US11417461B2
公开(公告)日：2022-08-16
申请号：US17176685
申请日：2021-02-16
Applicant: Google LLC
Inventor： Liyu Yang , Liang Jia , Srikanth Lakshmikanthan , Li Wang , Qi Tian , YungChih Chen , Veera Venkata Siva Nagesh Polu , Stefano Saggini , Mario Ursino , Ruben Specogna
Abstract: This document describes techniques and apparatuses directed at reducing inductive-charging power loss. In aspects, a mobile device includes a multi-layer flexible printed circuit board (FPCB) coil that forms a receiver coil having a Litz-wire structure. The FPCB coil includes a multi-trace bundle, having traces systematically routed throughout the different layers of the FPCB coil to reduce eddy current losses.
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公开(公告)号：US11342796B2
公开(公告)日：2022-05-24
申请号：US16125328
申请日：2018-09-07
Applicant: Google LLC
Inventor： Qi Tian , Veera Venkata Siva Nagesh Polu , Liang Jia , Liyu Yang , Jae-won Hwang , Rahul Apte , Srikanth Lakshmikanthan , Srenik Suresh Mehta , Robert Thomas Shone
Abstract: Methods, systems, and techniques for safely controlling wireless charging in the presence of a foreign object are presented. A method includes determining a power difference between a power transmitted by a wireless charger and a power received by an electronic device, determining a level of misalignment of the electronic device with respect to the wireless charger; estimating an amount of power difference due to the level of misalignment of the electronic device with respect to the wireless charger, adjusting a power difference threshold for the wireless charger based on the estimated amount of power difference, and controlling operation of the wireless charger based on the power difference and the adjusted power difference threshold.
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公开(公告)号：US20220115918A1
公开(公告)日：2022-04-14
申请号：US17065595
申请日：2020-10-08
Applicant: Google LLC
Inventor： Qi Tian , Liang Jia , Tressa Christie Scott , Srikanth Lakshmikanthan
Abstract: The present disclosure provides for a wearable device having a wireless power receiving system that may inductively receive or transmit power. The wireless power receiving system includes a receiver coil having a profile that follows a contour of a bottom cover of the wearable device. A transmitter coil from a wireless charging device has a complementary profile that mates with the profile defined by the receiver coil. In one example, the wireless power receiving system includes a shielding, and a receiver coil attached to the shielding. The receiver coil further includes an inner wall and an outer wall connected by a top surface of a coil body. The inner wall defines a center opening in the receiver coil, wherein the receiver coil is conical in shape.
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公开(公告)号：US10386907B2
公开(公告)日：2019-08-20
申请号：US15718546
申请日：2017-09-28
Applicant: Google LLC
Abstract: A computing device is associated with a circuit for sharing and distributing backup power. During normal operating conditions, a main bus bar provides power to each computing device in a rack via a main power bus of the corresponding circuit. In the event of an AC power outage, the main power bus is deactivated and a backup power path of the circuit is activated. Backup power is provided to the device from a battery of the circuit via the backup power path. A shared power path is also activated in the circuit such that backup power may be provided from the battery to the main bus bar. By providing backup power to the main bus bar, the other computing devices in the rack that do not have sufficient backup power may receive backup power from the main bus bar until AC power is restored.
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Patent Agency Ranking
公开(公告)号：US20190281556A1
公开(公告)日：2019-09-12
申请号：US16351639
申请日：2019-03-13
Applicant: Google LLC
Inventor： Enrique Romero Pintado , Liang Jia , Srikanth Lakshmikanthan , Eklavya Singh
Abstract: Methods, systems, and devices, including machine-readable media, for dynamic battery power management are disclosed. In some implementations, an electronic device that is powered by a battery senses a voltage provided by the battery and an electric current provided by the battery. The electronic device determines a present state of the battery. The electronic device determines a current limit for the electronic device based on the sensed voltage and electric current and the determined present state of the battery. The electronic device manages power use of the electronic device to maintain electric current draw from the battery at or below the electric current limit.
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公开(公告)号：US10298138B2
公开(公告)日：2019-05-21
申请号：US15693393
申请日：2017-08-31
Applicant: Google LLC
Inventor： Liang Jia , Honggang Sheng , Srikanth Lakshmikanthan
Abstract: In some implementations, a programmable power adapter includes a first set of switches, a resonant circuit, a transformer, and a second set of switches. The power adapter includes control circuitry configured to provide control signals that change the voltage conversion ratios of the first set of switches and the second set of switches. The control circuitry can provide control signals causing the first set of switches to operate in one of multiple operating modes that each correspond to a different voltage conversion ratio, and the control circuitry can provide control signals causing the second set of switches to operate in one of multiple operating modes that each correspond to a different voltage conversion ratio.
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公开(公告)号：US10277140B2
公开(公告)日：2019-04-30
申请号：US15693055
申请日：2017-08-31
Applicant: Google LLC
Inventor： Liang Jia , Srikanth Lakshmikanthan
Abstract: This specification describes a device that includes a voltage-regulated DC-DC converter comprising a switching network, a resonant circuit, and control circuitry, wherein the switching network has a switching frequency. The DC-DC converter has an output impedance and the control circuity uses a control loop to control the DC-DC converter. The control circuitry implements the control loop using: an output voltage sensor configured to sense an output voltage of the DC-DC converter; and a compensator configured to adjust operation of the DC-DC converter based on the output voltage sensed by the output voltage sensor. The DC-DC converter comprises an output impedance suppression mechanism configured to at least partially suppress increases in the output impedance of the DC-DC converter.
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公开(公告)号：US20250118998A1
公开(公告)日：2025-04-10
申请号：US18909702
申请日：2024-10-08
Applicant: Google LLC
Inventor： Zhenxue Xu , Shuo Wang , Liang Jia , Srikanth Lakshmikanthan , Yirui Yang
Abstract: An electronic device includes a wireless charging receive coil configured to transduce, into an alternating current (AC) power signal, a magnetic field generated by a wireless charging transmit coil of an external device; an active rectifier configured to convert the AC signal received at an AC side of the active rectifier into a direct current (DC) power signal output at a DC side of the active rectifier, the active rectifier comprising a plurality of switches; a first modulation capacitor connected to an upper rail of the AC side; a second modulation capacitor connected to a lower rail of the AC side; and a controller configured to adjust an impedance of the computing device to communicate with the external device by at least controlling the plurality of switches to cause the first modulation capacitor and the second modulation capacitor to charge during separate time periods.
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公开(公告)号：US12008176B2
公开(公告)日：2024-06-11
申请号：US18002192
申请日：2020-08-31
Applicant: Google LLC
Inventor： Liang Jia , Srikanth Lakshmikanthan , Liyu Yang
IPC: G06F3/0354 , H02J7/00 , H02J50/00 , H02J50/90
CPC classification number: G06F3/03545 , H02J7/0044 , H02J50/005 , H02J50/90
Abstract: An example active stylus includes a core comprising: a main cylinder having a first end, a second end; a first supplemental cylinder disposed at the first end of the main cylinder and having a diameter that is larger than a diameter of the main cylinder; a second supplemental cylinder disposed between the first supplemental cylinder and the second end of the main cylinder and having a diameter that is larger than the diameter of the main cylinder; and a wireless charging receive coil configured to transduce flux of a magnetic field generated by a wireless charging transmit coil into electrical current, wherein the wireless charging receive coil is positioned around a longitudinal axis of the main cylinder of the core and between the first supplemental cylinder and the second supplemental cylinder.
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