Patents by Inventor Muhammad Hussain Alvi
Muhammad Hussain Alvi 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: 20250050759Abstract: A vehicle includes a system for charging a battery of the vehicle. The system includes an electric motor couplable to a charging station, a capacitor-clamped multi-level inverter, and a processor. The capacitor-clamped multi-level inverter is couples the electric motor to the battery and includes a first leg having a first set of switches and a first AC terminal coupled to the electric motor, a second leg having a second set of switches and a second AC terminal coupled to the electric motor and a third leg having a third set of switches and a third AC terminal coupled to the electric motor. The processor connects one of the third AC terminal and a neutral point of the electric motor to the charging station and control at least one of the first set of switches and the second set of switches to charge the battery through the electric motor.Type: ApplicationFiled: August 11, 2023Publication date: February 13, 2025Inventors: Chandra S. Namuduri, Muhammad Hussain Alvi, Rashmi Prasad, Khorshed Mohammed Alam, Junghoon Kim, Yilun Luo
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Patent number: 12213291Abstract: A power control system for an electric vehicle includes a power inverter comprising a switch module including a plurality of power switches, a controller board, and a gate driver board in communication with the controller board and configured to drive gates of the plurality of switches. A first housing is made of polymer composite, encloses the power inverter, defines a first cooling cavity in thermal communication with a first surface of the switch module, and encapsulates a portion of at least one of the switch module, the controller board and the gate driver board.Type: GrantFiled: August 12, 2022Date of Patent: January 28, 2025Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Anthony Michael Coppola, Erik Brandon Golm, Alireza Fatemi, Ming Liu, Seongchan Pack, Muhammad Hussain Alvi, Ronald O. Grover, Jr.
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Publication number: 20250018808Abstract: A conversion system includes a conversion device including a multilevel inverter configured to generate two alternating current (AC) output currents, a current sensor configured to sample a current through the multilevel inverter, or from the multilevel inverter, during a switching cycle, and a processor configure to estimate both of the two AC output currents based on the sampled current from the current sensor.Type: ApplicationFiled: July 14, 2023Publication date: January 16, 2025Inventors: Muhammad Hussain Alvi, Chandra S. Namuduri, Junghoon Kim, Yilun Luo
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Publication number: 20250015742Abstract: Multi-switch module packaging for a multilevel inverter is provided. A multilevel inverter is connected to the battery. The multilevel inverter includes three levels, each of the three levels having a first module and a second module. The first module is formed on a first insulating substrate material, and the second module is formed on a second insulating substrate material separate from the first insulating substrate material. The first module includes a first switch coupled to the battery via a positive power rail, a second switch coupled to the battery via a negative power rail, and a third switch coupled to the second module. The second module includes another first switch coupled to the battery, another second switch coupled to the battery, and another third switch coupled to the first module. The first module includes four terminals and the second module includes another four terminals.Type: ApplicationFiled: July 6, 2023Publication date: January 9, 2025Inventors: Rashmi Prasad, Chandra S. Namuduri, Muhammad Hussain Alvi, Junghoon Kim, Khorshed Mohammed Alam, Thomas W. Nehl, Yilun Luo
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Publication number: 20250010761Abstract: A multi-level inverter control system includes a power storage system having a high voltage terminal, a low voltage terminal, and an intermediate voltage terminal. The intermediate voltage terminal is at a voltage between the high voltage terminal and the low voltage terminal. A multi-level inverter includes a plurality of switches, a high voltage input connected to the high voltage terminal, a low voltage input connected to the low voltage terminal, and an intermediate voltage input connected to the intermediate voltage terminal. A controller is controllably coupled to the multi-level inverter. The controller includes at least a processor and a memory. The memory stores instructions configured to cause the controller to operate the multi-level inverter in a three-level inverter mode, a full power two-level inverter mode, a first partial power two-level inverter mode and a second partial power two-level inverter mode.Type: ApplicationFiled: July 6, 2023Publication date: January 9, 2025Inventors: Muhammad Hussain Alvi, Chandra S. Namuduri, Suresh Gopalakrishnan, Junghoon Kim, Yilun Luo
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Publication number: 20250007440Abstract: A system includes an inverter configured to output multiphase alternating current (AC) currents to an electric motor, the multiphase AC currents including a first phase current and a second phase current, the inverter including a set of switches for each phase current. The system also includes a switching controller operably connected to each set of switches, the switching controller configured to control a gate driver connected to a switch of the set of switches, the switching controller configured to determine a time difference between a first switching event of a first phase and a second switching event of a second phase during a switching cycle, and control a switching speed of the switch based on the time difference.Type: ApplicationFiled: June 27, 2023Publication date: January 2, 2025Inventors: Muhammad Hussain Alvi, Yilun Luo, Brian A Welchko, Suresh Gopalakrishnan
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Patent number: 12185510Abstract: A cooling system for a drivetrain of an electric vehicle includes a coolant circuit directing a flow of coolant through a first inverter and a second inverter of the drivetrain, and an adjustable flow valve positioned along the coolant circuit to selectably alter proportions of the flow of coolant directed through each of the first inverter and the second inverter. A method of operating a cooling system for a first inverter and a second inverter of a vehicle drivetrain includes commanding a speed and torque of each of the first and second inverter, and estimating losses and temperature of each of the first inverter and the second inverter as a result of the commanded speed and torque. A valve position of an adjustable flow valve operably connected to the first inverter and the second inverter is selected, and a change of the valve position is commanded.Type: GrantFiled: July 20, 2022Date of Patent: December 31, 2024Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Muhammad Hussain Alvi, Ronald O. Grover, Jr., Brian A. Welchko, Chandra S. Namuduri
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Patent number: 12176892Abstract: A system includes an electronic device including a circuit having a semiconductor switch, and a switching control system operably connected to the semiconductor switch. The switching control system is configured to control a switching speed of the semiconductor switch based on a received voltage by altering at least one of a gate resistance and a gate capacitance of the semiconductor switch.Type: GrantFiled: September 30, 2022Date of Patent: December 24, 2024Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Muhammad Hussain Alvi, Khorshed Mohammed Alam, Yilun Luo, Chandra S. Namuduri, Suresh Gopalakrishnan, Junghoon Kim, Mohamed Kamel
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Publication number: 20240421747Abstract: An electric motor circuit includes a motor controller having a plurality of gate drivers and an inverter configured to receive direct current (DC) power from a source and output alternating current (AC) power to an electric motor. The inverter includes a plurality of transistor elements. Each transistor element includes multiple transistors arranged on a transistor board. Multiple temperature sensors are configured to monitor a plurality of temperatures on each transistor element. The motor controller is configured to alter a pulse width modulation (PWM) control of a first subset of transistors on a first transistor element in response to a first subset of temperature sensors detecting a temperature exceeding a threshold temperature and a second subset of temperature sensors not detecting a temperature exceeding the threshold.Type: ApplicationFiled: June 16, 2023Publication date: December 19, 2024Inventors: Muhammad Hussain Alvi, Cherian A. Idicheria, Brian A. Welchko
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Publication number: 20240416796Abstract: A vehicle includes two or more battery packs configured to power a motor. A controller is configured to dynamically activate an operational mode during operation. The operational mode is one of multiple possible operational modes including a first operational mode defining a series connection between the two or more battery packs and second operational mode defining a parallel connection between the two or more battery packs. The connection between the battery packs is controlled by a first plurality of switches. A plurality of low voltage loads are connected to a subset of the battery packs in the battery packs such that a power output of the subset of the battery packs provides full power to the plurality of low voltage loads. The plurality of low voltage loads are connected to only the subset of the battery packs in both the first operational mode and the second operational mode.Type: ApplicationFiled: June 16, 2023Publication date: December 19, 2024Inventors: Chunhao J. Lee, Suresh Gopalakrishnan, Yongjie Zhu, Dongxu Li, Muhammad Hussain Alvi
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Publication number: 20240421681Abstract: A vehicle's electrified powertrain includes a battery pack linked to a traction power inverter module (TPIM) converting DC voltage from the battery pack into AC voltage. A rotary electric machine includes a stator energized by the TPIM's AC voltage, enclosing a rotor core capable of rotation. The rotor core contains slots holding conductive bars and permanent magnets, with conductive bars positioned closer to the rotor core's center. The conductive bars and permanent magnets are separated by gaps within each slot. An annular end ring assembly is present at one end of the rotor core, featuring terminal conductors connected to subsets of conductive bars and a secondary coil of a rotary transformer. When the stator is energized, the rotor shaft, connected to the rotor, rotates. The electric machine powers a transmission, which is coupled to the rotor shaft.Type: ApplicationFiled: June 16, 2023Publication date: December 19, 2024Inventors: Alireza Fatemi, Alan G. Holmes, Shawn H. Swales, Mazharul Chowdhury, Muhammad Hussain Alvi, Peng Peng, Thomas W. Nehl
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Publication number: 20240408974Abstract: A motor system includes a rechargeable energy storage system, an alternating current motor, and a power inverter. Multiple efficiency maps may be provided, each representing a specific combination of control parameters and associated settings. The maps relate the motor's operating space (torque and speed) to corresponding efficiency solutions. The combination of control parameters and settings that yields the highest motor system efficiency at an operating point may be determined from the multiple efficiency maps and used in controlling the motor.Type: ApplicationFiled: June 9, 2023Publication date: December 12, 2024Inventors: Muhammad Hussain Alvi, Suresh Gopalakrishnan, Alireza Fatemi, Renato Amorim Torres, Chunhao J. Lee, Junghoon Kim
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Publication number: 20240413777Abstract: An electric motor configuration includes a dual output multilevel inverter. The inverter includes a first and second set of alternating current (AC) phase outputs. The first set of AC phase outputs provide a current, each phase output of the first set of AC phase outputs corresponds to a phase output of the second set of AC phase outputs, and each phase output of the first set of AC phase outputs is offset from the corresponding phase output of the second set of phase outputs by 180 degrees. An electric motor includes a first and second set of antiparallel motor windings. The first set of motor windings is connected to the first set of AC phase outputs and the second set of motor windings are connected to the second set of AC phase outputs. The electric motor includes a mechanical rotation output.Type: ApplicationFiled: June 7, 2023Publication date: December 12, 2024Inventors: Junghoon Kim, Muhammad Hussain Alvi, Mohammad F. Momen, Yilun Luo
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Patent number: 12155317Abstract: A power conversion device includes an inverter configured to receive direct current (DC) power and convert the DC power to alternating current (AC) power, at least one capacitor having a first capacitance, and a busbar assembly electrically connected to the inverter and configured to electrically connect the inverter to a power source. The busbar assembly includes a positive busbar and a negative busbar, and a first capacitor layer disposed between the positive busbar and the negative busbar. The first capacitor layer is configured provide an amount of capacitance in addition to the first capacitance.Type: GrantFiled: July 18, 2022Date of Patent: November 26, 2024Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Muhammad Hussain Alvi, Chandra S. Namuduri
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Publication number: 20240380334Abstract: A multilevel inverter includes a set of inverter switches arranged in a multilevel inverter topology. The multilevel inverter topology has a high voltage (V) input, a low voltage input and an intermediate voltage input. A first voltage source connects the high voltage input to the intermediate voltage input and a second voltage source connects the intermediate voltage input to the low voltage source.Type: ApplicationFiled: May 10, 2023Publication date: November 14, 2024Inventors: Muhammad Hussain Alvi, Renato Amorim Torres, Chandra S. Namuduri, Rashmi Prasad
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Patent number: 12142960Abstract: A method and apparatus for electrical energy transfer between a pair of series connected batteries coupled between positive and negative DC rails of a power inverter operatively connected to a plurality of stator phase windings of a stator winding of a motor may include coupling a midpoint of the pair of series connected batteries to the stator winding of the motor, and controlling the power inverter to operate the power inverter and the stator winding as a switched-mode power converter to charge at least one of the stator phase windings from one of the pair of series connected batteries and to discharge the at least one of the stator phase windings to the other of the pair of series connected batteries.Type: GrantFiled: June 14, 2022Date of Patent: November 12, 2024Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Mohamed Kamel, Muhammad Hussain Alvi, Alireza Fatemi, Chandra S. Namuduri, Rashmi Prasad
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Patent number: 12139040Abstract: An electric drive system for an electric vehicle is provided. The electric drive system includes a first electric drive, a second electric drive, and a switchable battery including at least two battery packs that are selectively arranged in one of a series configuration and a parallel configuration. The electric drive system also includes a first half-bridge buck converter connecting the first electric drive to a first battery back of the at least two battery packs of the switchable battery and a second half-bridge buck converter connecting the second electric drive to a second battery back of the at least two battery packs of the switchable battery. The electric drive system further includes a controller configured to control the configuration of the switchable battery, an operation of the first half-bridge buck converter, and the second half-bridge buck converter.Type: GrantFiled: December 7, 2022Date of Patent: November 12, 2024Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Muhammad Hussain Alvi, Suresh Gopalakrishnan, Chandra S. Namuduri
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Patent number: 12136805Abstract: A vehicle, arc fault protection device of the vehicle and a method for mitigating an arc fault in an electrical system of the vehicle. The arc fault protection device includes a sensor, a switch, and a processor. The sensor is used for measuring a current in an electrical system. The processor is configured to determine a precursor phase of an arc fault from the current, wherein the precursor phase indicates an onset of an arc flash phase of the arc fault. The processor opens the switch to mitigate the arc fault during the arc flash phase.Type: GrantFiled: August 16, 2022Date of Patent: November 5, 2024Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Suresh Gopalakrishnan, Muhammad Hussain Alvi, Chandra S. Namuduri, Lyall Kenneth Winger, James Morrison, Xinyu Du
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Publication number: 20240361360Abstract: A current sensing apparatus includes a planar current conductor with a current shaping section, designed to carry an alternating current (AC) current with a maximum frequency. The current shaping section of the conductor consists of a pair of adjacent legs separated by a slot, which shapes the AC current to flow around the slot in opposite directions. The legs of the current conductor have a width no greater than twice the skin depth of the AC current at a frequency of at least half of the maximum frequency. The apparatus also includes a differential current sensor that measures the directional components of the AC current on opposite sides of the slot. This configuration allows for accurate current sensing while minimizing the effect of the skin effect at high frequencies, making it suitable for use in various applications where a broad range of fundamental frequencies are expected.Type: ApplicationFiled: April 25, 2023Publication date: October 31, 2024Inventors: Muhammad Hussain Alvi, Suresh Gopalakrishnan, Chunhao J. Lee, Dongxu Li
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Publication number: 20240363288Abstract: Aspects of the disclosure include a symmetric direct current (DC) link capacitor having a low parasitic equivalent series L-inductance (ESL). An exemplary capacitor can include one or more positive-dielectric-negative (PDN) stacks having a positive layer, a negative layer, and a dielectric layer between the positive layer and the negative layer. A first contact layer is electrically coupled to the positive layer on a sidewall of the one or more PDN stacks and a second contact layer is electrically coupled to the negative layer on the sidewall of the one or more PDN stacks. A positive terminal is electrically coupled to the first contact layer and a negative terminal is electrically coupled to the second contact layer.Type: ApplicationFiled: April 27, 2023Publication date: October 31, 2024Inventors: Junghoon Kim, Muhammad Hussain Alvi, Rashmi Prasad, Chandra S. Namuduri, Yilun Luo