Patents by Inventor Haihui Lu
Haihui Lu 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: 9960723Abstract: Disclosed examples include power conversion systems, computer readable mediums and methods for mitigating input filter resonance, in which a controller operates an active front end (AFE) rectifier in a first mode to turn a single rectifier switching device on and off and measures a filter voltage or current signal while all of the rectifier switches are off. The controller determines a resonant frequency based on a transient response of the measured voltage or current signal, and selectively adjusts a rectifier control parameter to mitigate filter resonance based on the resonant frequency.Type: GrantFiled: June 6, 2016Date of Patent: May 1, 2018Assignee: Rockwell Automation Technologies, Inc.Inventors: Shaofeng Zhang, Haihui Lu, Yogesh P. Patel, Ahmed Mohamed Sayed Ahmed, Lixiang Wei, Richard Lukaszewski
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Patent number: 9880223Abstract: A method of estimating stator resistance of an induction motor is provided. The method includes applying voltage pulses through two phase paths of the motor for a plurality of electrical cycles to inject current in the motor, wherein the voltage pulses are applied until rotor flux of the motor is substantially stabilized and measuring stator voltage and stator current in response to the applied voltage pulses for each of the plurality of electrical cycles. The method also includes calculating the stator resistance based upon the measured stator voltages and the stator currents.Type: GrantFiled: June 3, 2014Date of Patent: January 30, 2018Assignee: Rockwell Automation Technologies, Inc.Inventors: David M. Messersmith, Douglas J. Bader, Haihui Lu, Thomas A. Nondahl, Zhenhuan Yuan
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Publication number: 20170353138Abstract: Disclosed examples include power conversion systems, computer readable mediums and methods for mitigating input filter resonance, in which a controller operates an active front end (AFE) rectifier in a first mode to turn a single rectifier switching device on and off and measures a filter voltage or current signal while all of the rectifier switches are off. The controller determines a resonant frequency based on a transient response of the measured voltage or current signal, and selectively adjusts a rectifier control parameter to mitigate filter resonance based on the resonant frequency.Type: ApplicationFiled: June 6, 2016Publication date: December 7, 2017Applicant: Rockwell Automation Technologies, Inc.Inventors: Shaofeng Zhang, Haihui Lu, Yogesh P. Patel, Ahmed Mohamed Sayed Ahmed, Lixiang Wei, Richard Lukaszewski
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Patent number: 9787213Abstract: Multilevel inverters, power cells and bypass methods are presented in which a power cell switching circuit is selectively disconnected from the power cell output, and a bypass which is closed to connect first and second cell output terminals to selectively bypass a power stage of a multilevel inverter, with an optional AC input switch to selectively disconnect the AC input from the power cell switching circuit during bypass.Type: GrantFiled: December 22, 2015Date of Patent: October 10, 2017Assignee: Rockwell Automation Technologies, Inc.Inventors: Lixiang Wei, Yuan Xiao, Haihui Lu, Douglas B. Weber
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Publication number: 20170198040Abstract: The present invention relates to isolated antibodies and antigen-binding fragments thereof which selectively bind human CD32b. Also provided herein are compositions comprising the antibodies or antigen-binding fragments thereof, methods of using the antibodies or antigen-binding fragments thereof, and methods of making the antibodies or antigen-binding fragments thereof.Type: ApplicationFiled: December 16, 2016Publication date: July 13, 2017Applicant: Novartis AGInventors: Nicole BALKE, Thomas CALZASCIA, Stefan EWERT, Alan HARRIS, Heather Adkins HUET, Isabelle ISNARDI, Haihui LU, Matthew John MEYER, Nicholas WILSON, Fangmin WU
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Publication number: 20170178782Abstract: For reducing volume requirements and magnetic flux leakage, a compact inductor includes a first planar core with a first core thickness along a first axis orthogonal to a plane of the first planar core. In addition, the inductor includes a second planar core disposed parallel to the first planar core with a second core thickness along the first axis. The inductor further includes a plurality of electrical windings disposed between and adjacent to an inside plane of the first planar core and an inside plane of the second planar core. The electrical windings may include insulated electrical wires. No magnetic teeth may be disposed between the first planar core and the second planar core. The first axis is parallel to a magnetic axis of each electrical winding.Type: ApplicationFiled: December 17, 2015Publication date: June 22, 2017Inventors: Xikai Sun, Wei Qian, Shaofeng Zhang, Haihui Lu, Lixiang Wei, Yuan Xiao, Jiangang Hu, Richard A. Lukaszewski
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Patent number: 9685898Abstract: An apparatus includes a switch module that selectively turns on a switch to connect an input power conductor connected to a voltage source to a motor in a sequence. The switch for each phase is turned on for a portion of a cycle of a fundamental frequency of the voltage source. A source phase module determines a phase of the AC voltage source, a back-EMF phase module determines a phase of a back-EMF of the motor, and a torque module determines when a phase difference between the phase of the AC voltage source and the phase of the back-EMF is within a phase range indicative of a positive motor torque. A pulse module enables the switches in response to the phase difference having a phase within the phase range and disables the switches in response to the phase difference having a phase not in the phase range.Type: GrantFiled: July 1, 2014Date of Patent: June 20, 2017Assignee: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Kun Wei, HaiHui Lu, Andrew Jaap, David Messersmith, Randall Langer, Ping Lee
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Patent number: 9590547Abstract: A double fed induction generator (DFIG) converter, methods and computer readable mediums are presented in which rotor side current spikes are attenuated by selectively activating at least one series damping circuit to conduct current through a series damping circuit resistance coupled in series between one or more DFIG rotor leads and a grid side converter in response to a grid fault occurrence or a grid fault clearance, and selectively bypassing the series damping circuit resistance after activating the series damping circuit.Type: GrantFiled: April 27, 2015Date of Patent: March 7, 2017Assignee: Rockwell Automation Technologies, Inc.Inventors: Haihui Lu, Zhenhuan Yuan, Lixiang Wei, Russel J. Kerkman, Richard Lukaszewski, Ahmed Mohamed Sayed Anmed
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Patent number: 9350275Abstract: An apparatus for a quasi variable frequency motor controller is includes a DFC module that applies a first frequency to a motor as part of a discrete frequency control (“DFC”) method for motor starting. The first frequency includes a discrete frequency in a plurality of discrete frequencies of the DFC method and each discrete frequency includes a frequency lower than a fundamental frequency of an alternating current (“AC”) voltage source providing power to the motor. The apparatus includes a torque module that determines when motor torque generated by the motor reaches a negative torque threshold and a next frequency module that applies a second frequency to the motor in response to the torque module determining that the motor torque has reached the negative torque threshold. The second frequency is a next frequency in the DFC method.Type: GrantFiled: July 1, 2014Date of Patent: May 24, 2016Assignee: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Kun Wei, HaiHui Lu, Andrew Jaap, David Messersmith, Randall Langer, Ping Lee
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Patent number: 9331487Abstract: Methods and apparatus are presented for unintentional islanding detection for grid tie converters in which the phase angle disturbance is introduced by modification of grid side converter switching control signals and a mismatch of reactive power between generation and the grid load is formed upon the occurrence of unintentional islanding, where the applied phase disturbance is determined according to two pre-defined curves to form an equivalent positive feedback at different frequencies to prevent the converter from forming an island at a new stable frequency after the grid is disconnected.Type: GrantFiled: March 14, 2013Date of Patent: May 3, 2016Assignee: Rockwell Automation Technologies, Inc.Inventors: Zhenhuan Yuan, Shaofeng Zhang, Haihui Lu, Lixiang Wei, Russel J. Kerkman, Richard Lukaszewski, Ahmed Mohamed Sayed Ahmed, Robert J. Breitzmann
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Publication number: 20160111967Abstract: Multilevel inverters, power cells and bypass methods are presented in which a power cell switching circuit is selectively disconnected from the power cell output, and a bypass which is closed to connect first and second cell output terminals to selectively bypass a power stage of a multilevel inverter, with an optional AC input switch to selectively disconnect the AC input from the power cell switching circuit during bypass.Type: ApplicationFiled: December 22, 2015Publication date: April 21, 2016Applicant: Rockwell Automation Technologies, Inc.Inventors: Lixiang Wei, Yuan Xiao, Haihui Lu, Douglas B. Weber
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Patent number: 9240731Abstract: Multilevel inverters, power cells and bypass methods are presented in which a power cell switching circuit is selectively disconnected from the power cell output, and a bypass which is closed to connect first and second cell output terminals to selectively bypass a power stage of a multilevel inverter, with an optional AC input switch to selectively disconnect the AC input from the power cell switching circuit during bypass.Type: GrantFiled: March 18, 2013Date of Patent: January 19, 2016Assignee: Rockwell Automation Technologies, Inc.Inventors: Lixiang Wei, Yuan Xiao, Haihui Lu, Douglas B. Weber
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Publication number: 20150333685Abstract: An apparatus includes a switch module that selectively turns on a switch to connect an input power conductor connected to a voltage source to a motor in a sequence. The switch for each phase is turned on for a portion of a cycle of a fundamental frequency of the voltage source. A source phase module determines a phase of the AC voltage source, a back-EMF phase module determines a phase of a back-EMF of the motor, and a torque module determines when a phase difference between the phase of the AC voltage source and the phase of the back-EMF is within a phase range indicative of a positive motor torque. A pulse module enables the switches in response to the phase difference having a phase within the phase range and disables the switches in response to the phase difference having a phase not in the phase range.Type: ApplicationFiled: July 1, 2014Publication date: November 19, 2015Inventors: Kun Wei, HaiHui Lu, Andrew Jaap, David Messersmith, Randall Langer, Ping Lee
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Publication number: 20150333663Abstract: An apparatus for a quasi variable frequency motor controller is includes a DFC module that applies a first frequency to a motor as part of a discrete frequency control (“DFC”) method for motor starting. The first frequency includes a discrete frequency in a plurality of discrete frequencies of the DFC method and each discrete frequency includes a frequency lower than a fundamental frequency of an alternating current (“AC”) voltage source providing power to the motor. The apparatus includes a torque module that determines when motor torque generated by the motor reaches a negative torque threshold and a next frequency module that applies a second frequency to the motor in response to the torque module determining that the motor torque has reached the negative torque threshold. The second frequency is a next frequency in the DFC method.Type: ApplicationFiled: July 1, 2014Publication date: November 19, 2015Inventors: Kun Wei, HaiHui Lu, Andrew Jaap, David Messersmith, Randall Langer, Ping Lee
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Publication number: 20150229257Abstract: A double fed induction generator (DFIG) converter, methods and computer readable mediums are presented in which rotor side current spikes are attenuated by selectively activating at least one series damping circuit to conduct current through a series damping circuit resistance coupled in series between one or more DFIG rotor leads and a grid side converter in response to a grid fault occurrence or a grid fault clearance, and selectively bypassing the series damping circuit resistance after activating the series damping circuit.Type: ApplicationFiled: April 27, 2015Publication date: August 13, 2015Applicant: Rockwell Automation Technologies, Inc.Inventors: Haihui Lu, Zhenhuan Yuan, Lixiang Wei, Russel J. Kerkman, Richard Lukaszewski, Ahmed Mohamed Sayed Ahmed
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Patent number: 9041234Abstract: A double fed induction generator (DFIG) converter method are presented in which rotor side current spikes are attenuated using series-connected damping resistance in response to grid fault occurrences or grid fault clearances.Type: GrantFiled: March 26, 2012Date of Patent: May 26, 2015Assignee: Rockwell Automation Technologies, Inc.Inventors: Haihui Lu, Zhenhuan Yuan, Lixiang Wei, Russel Kerkman, Richard Lukaszewski, Ahmed Mohamed Sayed Ahmed
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Publication number: 20140285230Abstract: A method of estimating stator resistance of an induction motor is provided. The method includes applying voltage pulses through two phase paths of the motor for a plurality of electrical cycles to inject current in the motor, wherein the voltage pulses are applied until rotor flux of the motor is substantially stabilized and measuring stator voltage and stator current in response to the applied voltage pulses for each of the plurality of electrical cycles. The method also includes calculating the stator resistance based upon the measured stator voltages and the stator currents.Type: ApplicationFiled: June 3, 2014Publication date: September 25, 2014Inventors: David M. Messersmith, Douglas J. Bader, Haihui Lu, Thomas A. Nondahl, Zhenhuan Yuan
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Publication number: 20140265596Abstract: Methods and apparatus are presented for unintentional islanding detection for grid tie converters in which the phase angle disturbance is introduced by modification of grid side converter switching control signals and a mismatch of reactive power between generation and the grid load is formed upon the occurrence of unintentional islanding, where the applied phase disturbance is determined according to two pre-defined curves to form an equivalent positive feedback at different frequencies to prevent the converter from forming an island at a new stable frequency after the grid is disconnected.Type: ApplicationFiled: March 14, 2013Publication date: September 18, 2014Applicant: Rockwell Automation Technologies, Inc.Inventors: Zhenhuan YUAN, Shaofeng ZHANG, Haihui LU, Lixiang WEI, Russel J. Kerkman, Richard Lukaszewski, Ahmed Mohamed Sayed Ahmed, Robert J. Breitzmann
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Publication number: 20140268928Abstract: Multilevel inverters, power cells and bypass methods are presented in which a power cell switching circuit is selectively disconnected from the power cell output, and a bypass which is closed to connect first and second cell output terminals to selectively bypass a power stage of a multilevel inverter, with an optional AC input switch to selectively disconnect the AC input from the power cell switching circuit during bypass.Type: ApplicationFiled: March 18, 2013Publication date: September 18, 2014Applicant: Rockwell Automation Technologies, Inc.Inventors: Lixiang Wei, Yuan Xiao, Haihui Lu, Douglas B. Weber
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Publication number: 20140253055Abstract: The present techniques include methods and systems for operating converter to maintain a lifespan of the converter. In some embodiments, the operating frequency of the converter may be increased such that stress may be reduced on the bond wires of the converter. More specifically, embodiments involve calculating the aging parameters for certain operating conditions of the converter operating in a maximum power point tracking (MPPT) mode and determining whether the MPPT operation results in aging the converter to a point which reduces the converter lifespan below a desired lifespan. If the MPPT operation reduces the converter lifespan below the desired lifespan, the frequency of the converter may be increased such that the converter may be controlled to operate at a percentage of MPPT. Thus, in some embodiments, power output may be optimized with respect to maintaining a desired lifespan of the converter.Type: ApplicationFiled: May 22, 2014Publication date: September 11, 2014Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Lixiang Wei, Russel J. Kerkman, Richard A. Lukaszewski, Haihui Lu, Zhenhuan Yuan