Patents by Inventor Fred Wang
Fred Wang 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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Patent number: 11976361Abstract: An apparatus and method for depositing a transition metal nitride film on a substrate by atomic layer deposition in a reaction space defined by an at least one chamber wall and showerhead is disclosed. The apparatus may include, a substrate support disposed within the reaction space, the substrate support configured for supporting at least one substrate and a temperature control system for controlling a temperature of the at least one chamber wall at those portions of the at least one chamber wall that is exposed to a vapor phase reactant. The apparatus may also include a temperature control system for controlling a temperature of the showerhead, wherein the temperature control system for controlling a temperature of the showerhead is configured to control the temperature of the showerhead to a temperature of between approximately 80° C. and approximately 160° C.Type: GrantFiled: April 6, 2022Date of Patent: May 7, 2024Assignee: ASM IP Holding B.V.Inventors: Eric James Shero, Robert Brennan Milligan, William George Petro, Eric Wang, Fred Alokozai, Dong Li, Hao Wang, Melvin Verbaas, Luping Li
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Patent number: 11940361Abstract: The present disclosure provides an integrated collection, filtration, and analysis system which is configured to automatically collect fluid samples from a surrounding open water environment, isolate floating particles of a target size range, and perform analysis on the collected particles in-situ. The particles may also be filtered by one or more parameters other than size, and also provided herein is a two-stage vortex filter specially adapted to isolate floating particles of a desired density range from a fluid.Type: GrantFiled: August 27, 2021Date of Patent: March 26, 2024Inventors: Shiwei Liu, Xiaoge Cheng, Tianye Wang, Ben Hatfield, Fred Lu
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Publication number: 20230025698Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for automating software selection are disclosed. In one aspect, a method includes the actions of receiving, by a computing device, user interaction data that reflects an interaction between a first user and a second user. The actions further include receiving, by the computing device, user summary data that reflects characteristics of the first user. The actions further include, based on the user interaction data and the user summary data, determining, by the computing device, an application that is relevant to the interaction between the first user and the second user. The actions further include, based on determining the application that is relevant to the interaction between the first user and the second user, providing, for output to the second user, an interface of the application.Type: ApplicationFiled: July 26, 2021Publication date: January 26, 2023Inventors: John Oleinik, Fred Wang, Tanmaya Gaur, Madhusri Movva
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Patent number: 10886858Abstract: Circuits and methods for power conversion. In some examples, a modular multi-level converter (MMC) is configured for power conversion between an alternating current (AC) bus and a direct current (DC) bus. The MMC includes submodules arranged into a phase leg for at least one phase of the AC bus. Each submodule includes an energy storage component and a switch configured for bypassing the energy storage component or connecting the energy storage component into the phase leg. The MMC includes a pre-charger circuit configured to pre-charge the energy storage components of the submodules. The pre-charger circuit is configured for providing a first DC voltage that is lower than a second DC voltage on the DC bus, and the pre-charger circuit is coupled to an end submodule of the phase leg.Type: GrantFiled: October 15, 2019Date of Patent: January 5, 2021Assignee: University of Tennessee Research FoundationInventors: Shuoting Zhang, Fred Wang, Leon M. Tolbert
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Patent number: 10884023Abstract: The illustrative embodiments pertain to a test fixture having low insertion inductance for large bandwidth monitoring of current signals. In one exemplary embodiment, the test fixture includes a baseplate with each resistor of a set of resistors embedded inside a respective non-plated through slot in the baseplate. A first terminal of each resistor is soldered to a top metallic zone of the baseplate and a second terminal soldered to a first of two bottom metallic zones of the baseplate. The top metallic zone is connected by plated-through holes to a second of the two bottom metallic zones. When mounted upon a PCB, the test fixture allows current flow from the first bottom metallic zone, upwards through the set of resistors to the top metallic zone, and downwards to the second bottom metallic zone. An observation instrument may be coupled to a coaxial connector that is mounted on the baseplate.Type: GrantFiled: May 1, 2020Date of Patent: January 5, 2021Assignee: Keysight Technologies, Inc.Inventors: Edward Vernon Brush, IV, Neil Martin Forcier, Fei Fred Wang, Zheyu Zhang, Wen Zhang
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Publication number: 20200256890Abstract: The illustrative embodiments pertain to a test fixture having low insertion inductance for large bandwidth monitoring of current signals. In one exemplary embodiment, the test fixture includes a baseplate with each resistor of a set of resistors embedded inside a respective non-plated through slot in the baseplate. A first terminal of each resistor is soldered to a top metallic zone of the baseplate and a second terminal soldered to a first of two bottom metallic zones of the baseplate. The top metallic zone is connected by plated-through holes to a second of the two bottom metallic zones. When mounted upon a PCB, the test fixture allows current flow from the first bottom metallic zone, upwards through the set of resistors to the top metallic zone, and downwards to the second bottom metallic zone. An observation instrument may be coupled to a coaxial connector that is mounted on the baseplate.Type: ApplicationFiled: May 1, 2020Publication date: August 13, 2020Inventors: Edward Vernon Brush, IV, Neil Martin Forcier, Fei Fred Wang, Zheyu Zhang, Wen Zhang
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Patent number: 10670626Abstract: The illustrative embodiments pertain to a test fixture having low insertion inductance for large bandwidth monitoring of current signals. In one exemplary embodiment, the test fixture includes a baseplate with each resistor of a set of resistors embedded inside a respective non-plated through slot in the baseplate. A first terminal of each resistor is soldered to a top metallic zone of the baseplate and a second terminal soldered to a first of two bottom metallic zones of the baseplate. The top metallic zone is connected by plated-through holes to a second of the two bottom metallic zones. When mounted upon a PCB, the test fixture allows current flow from the first bottom metallic zone, upwards through the set of resistors to the top metallic zone, and downwards to the second bottom metallic zone. An observation instrument may be coupled to a coaxial connector that is mounted on the baseplate.Type: GrantFiled: December 15, 2017Date of Patent: June 2, 2020Assignee: Keysight Technologies, Inc.Inventors: Edward Vernon Brush, IV, Neil Martin Forcier, Fei Fred Wang, Zheyu Zhang, Wen Zhang
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Publication number: 20190187175Abstract: The illustrative embodiments pertain to a test fixture having low insertion inductance for large bandwidth monitoring of current signals. In one exemplary embodiment, the test fixture includes a baseplate with each resistor of a set of resistors embedded inside a respective non-plated through slot in the baseplate. A first terminal of each resistor is soldered to a top metallic zone of the baseplate and a second terminal soldered to a first of two bottom metallic zones of the baseplate. The top metallic zone is connected by plated-through holes to a second of the two bottom metallic zones. When mounted upon a PCB, the test fixture allows current flow from the first bottom metallic zone, upwards through the set of resistors to the top metallic zone, and downwards to the second bottom metallic zone. An observation instrument may be coupled to a coaxial connector that is mounted on the baseplate.Type: ApplicationFiled: December 15, 2017Publication date: June 20, 2019Inventors: Edward Vernon Brush, IV, Neil Martin Forcier, Fei Fred Wang, Zheyu Zhang, Wen Zhang
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Patent number: 10177647Abstract: A direct current controller includes a rectifier configured to convert alternating current input into a direct current output. A converter electrically coupled to the rectifier generates a converted direct current voltage that regulates a converted direct current from the direct current output of the rectifier and synthesizes an ac component of an alternating current grid to counteract an induced back-emf. A direct current controller central controller coupled to the converter regulates the converted direct current.Type: GrantFiled: September 9, 2016Date of Patent: January 8, 2019Assignee: UT-BATTELLE, LLCInventors: Fei (Fred) Wang, Burak Ozpineci, Sheng Zheng, Steven L. Campbell, Madhu Sudhan Chinthavali, Aleksandar D. Dimitrovski, Philip R. Irminger, Omer C. Onar, Larry E. Seiber, Leon M. Tolbert, Clifford P. White, Daniel J. Costinett, Zhi Li, Jingxin Wang, Fei Yang
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Publication number: 20170077799Abstract: A direct current controller includes a rectifier configured to convert alternating current input into a direct current output. A converter electrically coupled to the rectifier generates a converted direct current voltage that regulates a converted direct current from the direct current output of the rectifier and synthesizes an ac component of an alternating current grid to counteract an induced back-emf. A direct current controller central controller coupled to the converter regulates the converted direct current.Type: ApplicationFiled: September 9, 2016Publication date: March 16, 2017Inventors: Fei (Fred) Wang, Burak Ozpineci, Sheng Zheng, Steven L. Campbell, Madhu Sudhan Chinthavali, Aleksandar D. Dimitrovski, Philip R. Irminger, Omer C. Onar, Larry E. Seiber, Leon M. Tolbert, Clifford P. White, Daniel J. Costinett, Zhi Li, Jingxin Wang, Fei Yang
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Patent number: 9140731Abstract: A controller and infrastructure for an impedance analyzer measures responses to perturbations to respective phases of a multi-phase system at an interface between stages thereof (which may be considered as a source and load in regard to each other), such as a multi-phase electrical power system, to determine a transfer function for each phase of the multi-phase system from which the impedance of each of the source and load can be calculated, particularly for assessing the stability of the multi-phase system.Type: GrantFiled: September 14, 2012Date of Patent: September 22, 2015Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Gerald Francis, Rolando Burgos, Dushan Boroyevich, Fred Wang, Zhiyu Shen, Paolo Mattavelli, Kamiar Karimi, Sheau-Wei Johnny Fu
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Patent number: 9136773Abstract: Approximating loci of eigenvalues or characteristic gains of a return ratio matrix of a model of a multi-phase power converter circuit by the loci of the d-d and q-q elements of said synchronous frame of reference applied to said model, allows determination and assessment of stability of the circuit or forbidden operational parameters of the combination of an AC power source and a power converter at an interface thereof by application of a standard Nyquist stability criterion.Type: GrantFiled: September 10, 2012Date of Patent: September 15, 2015Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Rolando Burgos, Dushan Boroyevich, Fred Wang, Kamiar Karimi
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Patent number: 9071141Abstract: DC link capacitance in a bi-directional AC/DC power converter using a full-bridge or H-bridge switching circuit can be greatly reduced and the power density of the power converter correspondingly increased by inclusion of a bi-directional synchronous rectifier (SR) DC/DC converter as a second stage of the power converter and controlling the second stage with a control loop having a transfer function common to both buck and boost modes of operation of the bi-directional SR DC/DC converter and a resonant transfer function to increase gain at the ripple voltage frequency (twice the AC line frequency) to control the duty cycle of the switches of the bi-directional SR DC/DC stage and controlling the duty cycle of the switches of the full-bridge or H-bridge switching circuit using a control loop including a notch filter at the ripple voltage frequency.Type: GrantFiled: April 6, 2012Date of Patent: June 30, 2015Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Dong Dong, Dushan Boroyevich, Ruxi Wang, Fred Wang
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Patent number: 8823416Abstract: A phase detector for a phase-locked loop includes a phase detector that is configured to become unstable, oscillate and drift rapidly in frequency in a predictable manner when a reference frequency signal is not available. When applied, for example, to a power converter connected to a power distribution grid, the predictable oscillatory and rapid frequency drift behavior when the phase detector is unstable allows very rapid and reliable detection of disconnection from the grid, referred to as islanding.Type: GrantFiled: July 14, 2011Date of Patent: September 2, 2014Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Timothy N. Thacker, Dushan Boroyevich, Fred Wang, Rolando Burgos
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Patent number: 8570774Abstract: An electrical power system includes an alternating current (AC) power source configured to output an AC signal, a single phase pulse-width modulated (PWM) rectifier coupled to the AC power source and to an electrical load; a DC link capacitor coupled in parallel to the load and the PWM rectifier; and an active ripple energy storage circuit. The active ripple energy storage circuit has a first terminal, a second terminal and a third terminal, the active ripple energy storage circuit being coupled in parallel to the electrical load, the PWM rectifier and the DC link capacitor via the first terminal and the second terminal, the third terminal being coupled to the second terminal, the active ripple energy storage circuit being configured to selectively absorb and discharge at least part of the ripple energy.Type: GrantFiled: July 29, 2009Date of Patent: October 29, 2013Inventors: Ruxi Wang, Fred Wang, Rolando Burgos, Dushan Boroyevich, Kaushik Rajashekara, Stephen A. Long
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Publication number: 20130099800Abstract: A controller and infrastructure for an impedance analyzer measures responses to perturbations to respective phases of a multi-phase system at an interface between stages thereof (which may be considered as a source and load in regard to each other), such as a multi-phase electrical power system, to determine a transfer function for each phase of the multi-phase system from which the impedance of each of the source and load can be calculated, particularly for assessing the stability of the multi-phase system.Type: ApplicationFiled: September 14, 2012Publication date: April 25, 2013Inventors: Gerald FRANCIS, Rolando BURGOS, Dushan BOROYEVICH, Fred WANG, Zhiyu SHEN, Paolo MATTAVELLI, Kamiar KARIMI, Sheau-Wei Johnny FU
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Publication number: 20130076332Abstract: Approximating loci of eigenvalues or characteristic gains of a return ratio matrix of a model of a multi-phase power converter circuit by the loci of the d-d and q-q elements of said synchronous frame of reference applied to said model, allows determination and assessment of stability of the circuit or forbidden operational parameters of the combination of an AC power source and a power converter at an interface thereof by application of a standard Nyquist stability criterion.Type: ApplicationFiled: September 10, 2012Publication date: March 28, 2013Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.Inventors: Rolando Burgos, Dushan Boroyevich, Fred Wang, Kamiar Karimi
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Publication number: 20120257429Abstract: DC link capacitance in a bi-directional AC/DC power converter using a full-bridge or H-bridge switching circuit can be greatly reduced and the power density of the power converter correspondingly increased by inclusion of a bi-directional synchronous rectifier (SR) DC/DC converter as a second stage of the power converter and controlling the second stage with a control loop having a transfer function common to both buck and boost modes of operation of the bi-directional SR DC/DC converter and a resonant transfer function to increase gain at the ripple voltage frequency (twice the AC line frequency) to control the duty cycle of the switches of the bi-directional SR DC/DC stage and controlling the duty cycle of the switches of the full-bridge or H-bridge switching circuit using a control loop including a notch filter at the ripple voltage frequency.Type: ApplicationFiled: April 6, 2012Publication date: October 11, 2012Inventors: Dong Dong, Dushan Boroyevich, Ruxi Wang, Fred Wang
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Publication number: 20120013376Abstract: A phase detector for a phase-locked loop includes a phase detector that is configured to become unstable, oscillate and drift rapidly in frequency in a predictable manner when a reference frequency signal is not available. When applied, for example, to a power converter connected to a power distribution grid, the predictable oscillatory and rapid frequency drift behavior when the phase detector is unstable allows very rapid and reliable detection of disconnection from the grid, referred to as islanding.Type: ApplicationFiled: July 14, 2011Publication date: January 19, 2012Inventors: Timothy N. Thacker, Dusban Boroyevich, Fred Wang
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Publication number: 20100027304Abstract: An electrical power system includes an alternating current (AC) power source configured to output an AC signal, a single phase pulse-width modulated (PWM) rectifier coupled to the AC power source and to an electrical load; a DC link capacitor coupled in parallel to the load and the PWM rectifier; and an active ripple energy storage circuit.Type: ApplicationFiled: July 29, 2009Publication date: February 4, 2010Inventors: Ruxi Wang, Fred Wang, Rolando Burgos, Dushan Boroyevich, Kaushik Rajashekara, Stephen A. Long