Patents by Inventor Cheung-Wei Lam
Cheung-Wei Lam 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: 20240072684Abstract: An electronic device may include an inverter. The inverter may convert direct current (DC) power to alternating current (AC) power. The inverter may use a clock signal at a given frequency to output corresponding alternating current signals at the given frequency. The inverter may receive a dithered clock signal that is frequency dithered using a modulating signal. The dithered clock signal may have at least three different frequency levels during a repeated cycle of the modulating signal. The at least three different frequency levels may include a fundamental frequency, a first frequency that is lower than the fundamental frequency, and a second frequency that is higher than the fundamental frequency. The dithered clock signal may be, during the repeated cycle of the modulating signal, at the fundamental frequency for fewer total periods than at the first frequency and for fewer total periods than at the second frequency.Type: ApplicationFiled: June 26, 2023Publication date: February 29, 2024Inventors: Sujeet Milind Patole, Cheung-Wei Lam, Mahmoud N. Mahmoud
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Patent number: 11799565Abstract: A wireless power system has a wireless power transmitting device and a wireless power receiving device. A clock signal may be provided to inverter circuitry in wireless power transmitting circuitry at a power transmission frequency. The clock signal may cause transistors in the inverter circuitry to turn on and off to create AC current signals through the wireless power transmitting coil. The clock signal may be processed to mitigate electromagnetic interference in the system.Type: GrantFiled: July 6, 2022Date of Patent: October 24, 2023Assignee: Apple Inc.Inventors: Sujeet Milind Patole, Cheung-Wei Lam, Vaneet Pathak
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Patent number: 11799329Abstract: A shield for redirecting magnetic field generated from a plurality of transmitter coils includes a ferromagnetic structure divided into segments by a plurality of boundary regions, each segment comprises a first material having a first magnetic permeability and each boundary region comprises a second material having a second magnetic permeability lower than the first magnetic permeability, where the plurality of boundary regions are configured to resist a propagation of magnetic field from a first area of the ferromagnetic structure to a second area of the ferromagnetic structure, where the first area intercepts the magnetic field generated from at least one active transmitter coil of the plurality of transmitter coils.Type: GrantFiled: November 12, 2020Date of Patent: October 24, 2023Assignee: Apple Inc.Inventors: Jouya Jadidian, Vaneet Pathak, Martin Schauer, Cheung-Wei Lam, Darshan R. Kasar, Christopher S. Graham, Andro Radchenko
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Publication number: 20230336253Abstract: A wireless power system has a wireless power transmitting device and a wireless power receiving device. A clock signal may be provided to inverter circuitry in wireless power transmitting circuitry at a power transmission frequency. The clock signal may cause transistors in the inverter circuitry to turn on and off to create AC current signals through the wireless power transmitting coil. The clock signal may be processed to mitigate electromagnetic interference in the system.Type: ApplicationFiled: June 26, 2023Publication date: October 19, 2023Inventors: Sujeet Milind Patole, Cheung-Wei Lam, Vaneet Pathak
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Patent number: 11782668Abstract: Devices for mitigating or stopping noise or surface current on a display are provided. An electronic device including a display may include a display substrate, a mid-support plate that is adjacent to the display substrate, and a lower support plate that is adjacent to the mid-support plate. A space exists between the mid-support plate and the lower support plate. The mid-support plate includes one or more electromagnetic band gap (EBG) structures formed through the mid-support plate, one or more electromagnetic band gap structures mounted onto the mid-support plate, or both. The one or more electromagnetic band gap structures may mitigate or stop surface current flow across the display.Type: GrantFiled: August 31, 2022Date of Patent: October 10, 2023Assignee: Apple Inc.Inventors: Mahmoud N. Mahmoud, Cheung-Wei Lam, Ali Foudazi, Le Wang, Qianyi Zhao, Kedi Zhang, Xingchao C. Yuan, Jon F. Housour, Gary Chung
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Patent number: 11736032Abstract: An electronic device may include an inverter. The inverter may convert direct current (DC) power to alternating current (AC) power. The inverter may use a clock signal at a given frequency to output corresponding alternating current signals at the given frequency. The inverter may receive a dithered clock signal that is frequency dithered using a modulating signal. The dithered clock signal may have at least three different frequency levels during a repeated cycle of the modulating signal. The at least three different frequency levels may include a fundamental frequency, a first frequency that is lower than the fundamental frequency, and a second frequency that is higher than the fundamental frequency. The dithered clock signal may be, during the repeated cycle of the modulating signal, at the fundamental frequency for fewer total periods than at the first frequency and for fewer total periods than at the second frequency.Type: GrantFiled: February 3, 2023Date of Patent: August 22, 2023Assignee: Apple Inc.Inventors: Sujeet Milind Patole, Cheung-Wei Lam, Mahmoud N Mahmoud
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Publication number: 20230047448Abstract: A wireless power system has a wireless power transmitting device and a wireless power receiving device. A clock signal may be provided to inverter circuitry in wireless power transmitting circuitry at a power transmission frequency. The clock signal may cause transistors in the inverter circuitry to turn on and off to create AC current signals through the wireless power transmitting coil. The clock signal may be processed to mitigate electromagnetic interference in the system.Type: ApplicationFiled: July 6, 2022Publication date: February 16, 2023Inventors: Sujeet Milind Patole, Cheung-Wei Lam, Vaneet Pathak
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Patent number: 11561752Abstract: Devices for mitigating or stopping noise or surface current on a display are provided. An electronic device including a display may include a display substrate, a mid-support plate that is adjacent to the display substrate, and a lower support plate that is adjacent to the mid-support plate. A space exists between the mid-support plate and the lower support plate. The mid-support plate includes one or more electromagnetic band gap (EBG) structures formed through the mid-support plate, one or more electromagnetic band gap structures mounted onto the mid-support plate, or both. The one or more electromagnetic band gap structures may mitigate or stop surface current flow across the display.Type: GrantFiled: September 20, 2021Date of Patent: January 24, 2023Assignee: Apple Inc.Inventors: Mahmoud N. Mahmoud, Cheung-Wei Lam, Ali Foudazi, Le Wang, Qianyi Zhao, Kedi Zhang, Xingchao C. Yuan, Jon F. Housour, Gary Chung
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Publication number: 20220413789Abstract: Devices for mitigating or stopping noise or surface current on a display are provided. An electronic device including a display may include a display substrate, a mid-support plate that is adjacent to the display substrate, and a lower support plate that is adjacent to the mid-support plate. A space exists between the mid-support plate and the lower support plate. The mid-support plate includes one or more electromagnetic band gap (EBG) structures formed through the mid-support plate, one or more electromagnetic band gap structures mounted onto the mid-support plate, or both. The one or more electromagnetic band gap structures may mitigate or stop surface current flow across the display.Type: ApplicationFiled: August 31, 2022Publication date: December 29, 2022Inventors: Mahmoud N. Mahmoud, Cheung-Wei Lam, Ali Foudazi, Le Wang, Qianyi Zhao, Kedi Zhang, Xingchao C. Yuan, Jon F. Housour, Gary Chung
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Patent number: 11262966Abstract: Devices for mitigating or stopping noise or surface current on a display are provided. An electronic device including a display may include a display substrate, a mid-support plate that is adjacent to the display substrate, and a lower support plate that is adjacent to the mid-support plate. A space exists between the mid-support plate and the lower support plate. The mid-support plate includes one or more electromagnetic band gap (EBG) structures formed through the mid-support plate, one or more electromagnetic band gap structures mounted onto the mid-support plate, or both. The one or more electromagnetic band gap structures may mitigate or stop surface current flow across the display.Type: GrantFiled: September 27, 2019Date of Patent: March 1, 2022Assignee: Apple Inc.Inventors: Mahmoud N. Mahmoud, Cheung-Wei Lam, Ali Foudazi, Le Wang, Qianyi Zhao, Kedi Zhang, Xingchao C. Yuan, Jon F. Housour, Gary Chung
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Publication number: 20220043621Abstract: Devices for mitigating or stopping noise or surface current on a display are provided. An electronic device including a display may include a display substrate, a mid-support plate that is adjacent to the display substrate, and a lower support plate that is adjacent to the mid-support plate. A space exists between the mid-support plate and the lower support plate. The mid-support plate includes one or more electromagnetic band gap (EBG) structures formed through the mid-support plate, one or more electromagnetic band gap structures mounted onto the mid-support plate, or both. The one or more electromagnetic band gap structures may mitigate or stop surface current flow across the display.Type: ApplicationFiled: September 20, 2021Publication date: February 10, 2022Inventors: Mahmoud N. Mahmoud, Cheung-Wei Lam, Ali Foudazi, Le Wang, Qianyi Zhao, Kedi Zhang, Xingchao C. Yuan, Jon F. Housour, Gary Chung
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Publication number: 20210110969Abstract: Wireless power transmitting devices according to embodiments of the present technology may include a contact surface configured to support one or more wireless power receiving devices. The wireless power transmitting devices may include a plurality of coils. The wireless power transmitting devices may also include a shield positioned between the plurality of coils and the contact surface. The shield may include one or more shield members, each shield member axially aligned with a separate coil of the plurality of coils, and may include a multilayer structure exhibiting various conductivities.Type: ApplicationFiled: November 24, 2020Publication date: April 15, 2021Applicant: Apple Inc.Inventors: Andro Radchenko, Vaneet Pathak, Martin Schauer, Cheung-Wei Lam, Rahul A. Sabnani
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Publication number: 20210098921Abstract: Spring clips that provide a reliable, low-impedance, low-harmonic path between various conductive enclosure components of electronic devices. These spring clips can include a low-impedance connection on each of two ends, where each end physically and electrically connects to an enclosure component of an electronic device. This can reduce an impedance between enclosure components and reduce the amplitude and harmonics of signals coupled onto them from a nearby antenna or other waveguide.Type: ApplicationFiled: September 24, 2020Publication date: April 1, 2021Applicant: Apple Inc.Inventors: Mahmoud N. Mahmoud, Cheung-Wei Lam, Vaneet Pathak, Ali Foudazi
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Publication number: 20210096804Abstract: Devices for mitigating or stopping noise or surface current on a display are provided. An electronic device including a display may include a display substrate, a mid-support plate that is adjacent to the display substrate, and a lower support plate that is adjacent to the mid-support plate. A space exists between the mid-support plate and the lower support plate. The mid-support plate includes one or more electromagnetic band gap (EBG) structures formed through the mid-support plate, one or more electromagnetic band gap structures mounted onto the mid-support plate, or both. The one or more electromagnetic band gap structures may mitigate or stop surface current flow across the display.Type: ApplicationFiled: September 27, 2019Publication date: April 1, 2021Inventors: Mahmoud N. Mahmoud, Cheung-Wei Lam, Ali Foudazi, Le Wang, Qianyi Zhao, Kedi Zhang, Xingchao C. Yuan, Jon F. Housour, Gary Chung
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Publication number: 20210099022Abstract: A wireless power system uses a wireless power transmitting device to transmit wireless power to wireless power receiving devices. The wireless power transmitting device has wireless power transmitting coils that extend under a wireless charging surface. Non-power-transmitting coils and magnetic sensors may be included in the wireless power transmitting device. During wireless power transfer operations, control circuitry in the wireless power transmitting device adjusts drive signals applied to the coils to reduce ambient magnetic fields. The drive signal adjustments are made based on device type information and other information on the wireless power receiving devices and/or magnetic sensor readings from the magnetic sensors. In-phase or out-of-phase drive signals are applied to minimize ambient fields depending on device type.Type: ApplicationFiled: December 11, 2020Publication date: April 1, 2021Inventors: Jouya Jadidian, Martin Schauer, Andro Radchenko, Cheung-Wei Lam, Ketan Shringarpure, Vaneet Pathak
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Publication number: 20210065965Abstract: A shield for redirecting magnetic field generated from a plurality of transmitter coils includes a ferromagnetic structure divided into segments by a plurality of boundary regions, each segment comprises a first material having a first magnetic permeability and each boundary region comprises a second material having a second magnetic permeability lower than the first magnetic permeability, where the plurality of boundary regions are configured to resist a propagation of magnetic field from a first area of the ferromagnetic structure to a second area of the ferromagnetic structure, where the first area intercepts the magnetic field generated from at least one active transmitter coil of the plurality of transmitter coils.Type: ApplicationFiled: November 12, 2020Publication date: March 4, 2021Applicant: Apple Inc.Inventors: Jouya Jadidian, Vaneet Pathak, Martin Schauer, Cheung-Wei Lam, Darshan R. Kasar, Christopher S. Graham, Andro Radchenko
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Patent number: 10855118Abstract: Wireless power transmitting devices according to embodiments of the present technology may include a contact surface configured to support one or more wireless power receiving devices. The wireless power transmitting devices may include a plurality of coils. The wireless power transmitting devices may also include a shield positioned between the plurality of coils and the contact surface. The shield may include one or more shield members, each shield member axially aligned with a separate coil of the plurality of coils, and may include a multilayer structure exhibiting various conductivities.Type: GrantFiled: September 28, 2018Date of Patent: December 1, 2020Assignee: Apple Inc.Inventors: Andro Radchenko, Vaneet Pathak, Martin Schauer, Cheung-Wei Lam, Rahul A. Sabnani
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Patent number: 10840007Abstract: A shield for redirecting magnetic field generated from a plurality of transmitter coils includes a ferromagnetic structure divided into segments by a plurality of boundary regions, each segment comprises a first material having a first magnetic permeability and each boundary region comprises a second material having a second magnetic permeability lower than the first magnetic permeability, where the plurality of boundary regions are configured to resist a propagation of magnetic field from a first area of the ferromagnetic structure to a second area of the ferromagnetic structure, where the first area intercepts the magnetic field generated from at least one active transmitter coil of the plurality of transmitter coils.Type: GrantFiled: July 24, 2017Date of Patent: November 17, 2020Assignee: Apple Inc.Inventors: Jouya Jadidian, Vaneet Pathak, Martin Schauer, Cheung-Wei Lam, Darshan R. Kasar, Christopher S. Graham, Andro Radchenko
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Patent number: 10804584Abstract: Systems, methods, and devices for diverting surface current on a display panel support plate are provided. An electronic transceiver device including a display panel may include a display back plate and a support plate, such that the support plate is disposed beneath the display back plate. The support plate may include an array of slots etched into the support plate, such that the array of slots may be used and positioned to divert an electromagnetic field on the support plate to redirect propagation of the surface current towards ground pins located on the display panel housing.Type: GrantFiled: March 18, 2019Date of Patent: October 13, 2020Assignee: Apple Inc.Inventors: Ali Foudazi, Cheung-Wei Lam, Mahmoud N. Mahmoud
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Publication number: 20200303801Abstract: Systems, methods, and devices for diverting surface current on a display panel support plate are provided. An electronic transceiver device including a display panel may include a display back plate and a support plate, such that the support plate is disposed beneath the display back plate. The support plate may include an array of slots etched into the support plate, such that the array of slots may be used and positioned to divert an electromagnetic field on the support plate to redirect propagation of the surface current towards ground pins located on the display panel housing.Type: ApplicationFiled: March 18, 2019Publication date: September 24, 2020Inventors: Ali Foudazi, Cheung-Wei Lam, Mahmoud N. Mahmoud