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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：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：US20240275206A1
公开(公告)日：2024-08-15
申请号：US18643764
申请日：2024-04-23
Applicant: Google LLC
Inventor： Liang Jia
CPC classification number: H02J50/005 , A44C5/0053 , H01F38/14 , H02J7/0042 , H02J50/10 , H02J50/90 , H01F27/36
Abstract: Devices for wireless charging with metal housings. The device comprises a wireless power receiving coil and an associated coil core, wherein the coil core defines a recess and at least a portion of the wireless power receiving coil is disposed in the recess; and a housing comprising one or more metal portions, wherein the housing is configured to receive at least a portion of the wireless power receiving coil and the associated coil core in an opening defined by the one or more metal portions. Alternatively, the device comprises a wireless power receiving coil and an associated coil core; a housing comprising one or more metal portions; and an alignment feature configured to interact with a magnet of a wireless charger to align the device with the wireless charger, wherein the alignment feature comprises a plurality of metal elements that are electrically insulated from each other.
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公开(公告)号：US20240136857A1
公开(公告)日：2024-04-25
申请号：US18546120
申请日：2021-02-23
Applicant: Google LLC
CPC classification number: H02J50/10 , H02J50/402 , H02M7/219
Abstract: An example device (204) includes a wireless charging receive coil (222) configured to transduce, into an alternating current—AC—power signal, a magnetic field generated by a wireless charging transmit coil (218) of an external device (202); an active rectifier (224) configured to convert the AC signal into a direct current—DC—power signal; and circuitry (226) configured to: obtain a target level of the DC power signal; and control the active rectifier (224) to output the DC power signal with the target level.
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Patent Agency Ranking
公开(公告)号：US20220278710A1
公开(公告)日：2022-09-01
申请号：US17746011
申请日：2022-05-17
Applicant: Google LLC
Inventor： Liang Jia , Jae-Won Hwang
Abstract: The technology provides for a wearable device including a body and an accessory adapted to be attached to the body. The body includes a first coil configured to inductively transmit power. The body may further include first power management circuitry configured to control the first coil to transmit power according to a wireless charging standard, and to modulate the power transmitted through the first coil to transmit data according to a wireless communication standard. The accessory may include a second coil configured to inductively receive power. The accessory may further include second power management circuitry configured to control the second coil to receive the power transmitted through the first coil according to the wireless charging standard, and to control the second coil to receive the data transmitted through the first coil according to the wireless communication standard.
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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：US20220123564A1
公开(公告)日：2022-04-21
申请号：US17281524
申请日：2019-12-13
Applicant: Google LLC
Inventor： Liang Jia
IPC: H02J7/00
Abstract: This disclosure describes apparatuses and techniques for a switched multi-cell battery system for electronic devices. In some aspects, a switched multi-cell battery system may transfer, via a plurality of power control switches electrical power from a power adapter to components of the electronic device by charging battery cells in series and by discharging the battery cells in parallel or as a single battery cell. As a result, the switched multi-cell battery system may reduce or eliminate a voltage step-down conversion stage to increase a power-transfer efficiency of an electronic device. By doing so, charging times may be reduced or operating times may be increased, thereby improving users' experience with their electronic devices.
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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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