Patents by Inventor Doug D. Deng
Doug D. Deng 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: 6919650Abstract: A hybrid use of a phase-locked-loop controller and a microprocessor-based controller to synchronize the phase angles of a three-phase AC power source, such as a static power converter, with those of a three-phase power grid. The phase-angle synchronization may enable the AC power source to be safely connected to the power grid to provide additional power capacity.Type: GrantFiled: May 31, 2002Date of Patent: July 19, 2005Assignee: Ballard Power Systems CorporationInventor: Doug D. Deng
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Patent number: 6714424Abstract: The present invention relates to a system and method for compensating the voltage distortion and minimizing the available voltage range loss both caused by switching dead-time of solid-state switch components in power conversion devices. As a result, the power quality supplied from the power conversion devices can be improved and the output voltage of such devices can be increased.Type: GrantFiled: November 27, 2002Date of Patent: March 30, 2004Assignee: Ballard Power Systems CorporationInventors: Doug D. Deng, Kon-King M. Wang, Steven J. Kowalec
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Publication number: 20040037097Abstract: The present invention relates to a system and method for compensating the voltage distortion and minimizing the available voltage range loss both caused by switching dead-time of solid switch components in power conversion devices. As a result, the power quality supplied from the power conversion devices can be improved and the output voltage of such devices can be increased.Type: ApplicationFiled: November 27, 2002Publication date: February 26, 2004Applicant: Ballard Power Systems CorporationInventors: Doug D. Deng, Kon-King M. Wang, Steven J. Kowalec
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Publication number: 20030222507Abstract: A hybrid use of a phase-locked-loop controller and a microprocessor-based controller to synchronize the phase angles of a three-phase AC power source, such as a static power converter, with those of a three-phase power grid. The phase-angle synchronization may enable the AC power source to be safely connected to the power grid to provide additional power capacity.Type: ApplicationFiled: May 31, 2002Publication date: December 4, 2003Applicant: Ballard Power Systems CorporationInventor: Doug D. Deng
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Patent number: 6603672Abstract: A power conversion system 10 which comprises a controller 12 and conversion assemblies 46, 48 which selectively rectify and invert an electrical signal. Conversion assemblies 46, 48 respectively comprise a plurality of integrated gate bipolar transistor assemblies. The power conversion system 10 is effective to convert DC current to AC current, convert AC current to DC current, and to control the output frequency of a received electrical signal to a conventional operating range.Type: GrantFiled: November 10, 2000Date of Patent: August 5, 2003Assignee: Ballard Power Systems CorporationInventors: Doug D. Deng, Dumitru Dan Raceu, Kent Michael Harmon
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Patent number: 6362988Abstract: A system 10 for synchronizing the phase angle of an alternating current power source (“APS”) 12 with the phase angle of a power grid 14. The system 10 provides for reliable synchronization between the phase angle of the APS 12 and the phase angle of the power grid 14 during both normal and abnormal operating conditions.Type: GrantFiled: June 29, 2000Date of Patent: March 26, 2002Assignee: Ford Global Tech., Inc.Inventors: Doug D. Deng, Mukunda V. Prema
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Patent number: 6246343Abstract: An error detection method for use with a two channel increment encoder. The error detection method operates to detect errors over a wide range of rotational velocity of a rotating member. The error detection method employs the signal from one or two of the channels of the encoder and determines if pulse edges from the signals deviate from expected normal behavior. When an error is detected, actions can then be taken by the controller for the rotating member to prevent undesired results.Type: GrantFiled: March 5, 1999Date of Patent: June 12, 2001Assignee: Ford Global Technologies, Inc.Inventors: Doug D. Deng, Kenneth James Farkas
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Patent number: 6239997Abstract: A system (10) and method (100) for connecting and synchronizing a supplemental power supply (10) and a power grid. The present invention detects current feedback signals ia and ib and grid phase voltage input signals Ua—g, Ub—g, and Uc—g for controlling and synchronizing the three-phase output voltages Ua—p, Ub—p, and Uc—p, of the supplemental power supply (10) with the power grid. The method (100) of the present invention detects the three-phase voltages of both the supplemental power supply, Ua—p, Ub—p, Uc—p and the power grid Ua—g, Ub—g, Uc—g, and converts the detected voltages into components Ud—com, Uq—com on a d-q plane.Type: GrantFiled: September 1, 2000Date of Patent: May 29, 2001Assignee: Ford Motor CompanyInventor: Doug D. Deng
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Patent number: 6178103Abstract: An inverter circuit (10) has a plurality of voltage source inverters (VSI) coupled in parallel. Each of the voltage source inverters are coupled to a load (14). A synch signal source (12) generates a square wave from a fundamental operating frequency. The square wave generated by the synch signal source (12) is coupled to each voltage source inverter (VSI). Each voltage source inverter VSI has a timer counter (22), a microprocessor (26), and an inverter (32). The timer counter (22) is preferably a triangle wave generator that corresponds to the time since a rising edge of a synch signal (18) The microprocessor (26) samples the cyclic output signal (24) and determines a phase angle for the voltage source inverter. The phase angle and the voltage magnitude are provided to the inverter (32). The inverter (32) provides an output signal to the load that has the same phase angle as the outputs of the other phase inverters.Type: GrantFiled: May 10, 2000Date of Patent: January 23, 2001Assignee: Ford Global Technologies, Inc.Inventors: Doug D. Deng, Kon-King Mike Wang, Vijay Bhavaraju
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Patent number: 6169679Abstract: A method for transmitting phase angle information between inverters in a parallel connected inverter system to synchronize the phase angles of the inverters includes transmitting a common phase angle signal to server inverters. The common phase angle signal is a function of the phase angle of a master inverter. The common phase angle signal is indicative of the absolute phase angle of the master inverter when the phase angle of the master inverter is equal to a phase angle value associated with a new phase cycle. The common phase angle signal is indicative of an incremental phase angle change of the phase angle of the master inverter in a given time period while the phase angle of the master inverter is different from the value associated with a new phase cycle. The server inverters control their phase angles in accordance with the common phase angle signal such that the phase angles of the master inverter and the server inverters are synchronized.Type: GrantFiled: March 21, 2000Date of Patent: January 2, 2001Assignee: Ford Motor CompanyInventors: Doug D. Deng, Kon-King Mike Wang
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Patent number: 6047787Abstract: A method for controlling regenerative energy in a system having an motor and having a power converter for converting regenerative energy from the motor for supply as electrical current to a receiving apparatus includes estimating a resistance to electrical current flow between the electrical power converter and the receiving apparatus and measuring a first voltage at the receiving apparatus. The method further comprises controlling a regenerative current from the power converter to the receiving apparatus in view of the resistance and the first voltage to limit a second voltage at the power converter.Type: GrantFiled: February 3, 1998Date of Patent: April 11, 2000Assignee: Ecostar Electric Drive Systems LLCInventors: Doug D. Deng, Christos Aristotles Kambouris, Kent Michael Harmon
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Patent number: 5994859Abstract: The present invention provides a method for reducing torsional vibration in a vehicle drivetrain. The method comprises detecting a rotational speed of the drivetrain to generate a rotational speed signal. The method also includes generating a vibration compensating torque command which is a function of a frequency content of the rotational speed signal. The present invention further provides a system for reducing torsional vibration in a vehicle drivetrain. The system includes a source of torque, a drivetrain coupled to receive torque from the source of torque and a speed detector adapted to detect a rotational speed of the drivetrain and generate a rotational speed signal. The system additionally includes an electronic controller coupled to the source of torque and programmed to provide operational command signals to the source of torque.Type: GrantFiled: April 30, 1997Date of Patent: November 30, 1999Assignee: Ford Motor CompanyInventors: Doug D. Deng, Jack H. Xu, Mukunda V. Prema
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Patent number: 5821720Abstract: The present invention provides a method for substantially eliminating backlash in drivetrain gears of a vehicle propelled by an electric motor. The method includes detecting whether brakes of the vehicle are applied. The method further comprises only if the brakes are applied, applying a torque from the electric motor to move at least some teeth of the gears into contact with one another. The present invention further provides a system for substantially eliminating backlash in a drivetrain of a motor vehicle. In one embodiment, the system comprises a plurality of wheels and a drivetrain coupled to at least one of said wheels and comprising engaging gears. The embodiment also includes brakes proximate to at least one of the wheels and adapted to selectively apply braking torque to the at least one of the wheels to which the brakes are proximate.Type: GrantFiled: April 30, 1997Date of Patent: October 13, 1998Assignee: Ford Motor CompanyInventors: Doug D. Deng, Jack H. Xu, Kenneth James Farkas