Patents by Inventor Rashmi Prasad
Rashmi Prasad 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: 20220285959Abstract: A mobile power source apparatus includes a mobile unit having a platform structure, a frame connected to the platform structure and multiple wheels rotatably connected to the platform structure to promote moving the mobile unit. An electronics power module is connected to a DC power source defining a high voltage DC battery. The electronics power module converts DC energy of the DC battery to at least one of an alternating current (AC) power and a direct current (DC) power. A wireless communication device promotes wireless communication of a battery state-of-charge (SOC) of the high voltage DC battery. A liquid cooling thermal system provides positive cooling of the electronics power module.Type: ApplicationFiled: March 8, 2021Publication date: September 8, 2022Inventors: Chandra S. Namuduri, Benjamin Christian, Thomas W. Nehl, Rashmi Prasad
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Patent number: 11400824Abstract: A method of controlling fast charging of at least one battery pack within a high voltage electrical propulsion system includes identifying an operating condition, wherein the operating condition is one of charging mode and propulsion mode, and, when the electrical system is in charging mode, initiating charging of the at least one battery pack, terminating charging of the at least one battery pack and connecting the at least one battery pack to power components of the electrical propulsion system when there is a request to terminate charging of the at least one battery pack, and terminating charging of the at least one battery pack and connecting the at least one battery pack to power components of the electrical propulsion system when there is no request to terminate charging of the at least one battery pack and the charging of the at least one battery pack is complete.Type: GrantFiled: June 29, 2020Date of Patent: August 2, 2022Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Rashmi Prasad, Chandra S. Namuduri, Suresh Gopalakrishnan, Thomas W. Nehl
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Publication number: 20220239114Abstract: A system for use with a direct current fast-charging (DCFC) station includes a controller and battery system. The battery system includes first and second battery packs, and first, second, and third switches. The switches have ON/OFF conductive states commanded by the controller to connect the battery packs in a parallel-connected (P-connected) or series-connected (S-connected) configuration. An electric powertrain with one or more electric machines is powered via the battery system. First and second charge ports of the system are connectable to the station via a corresponding charging cable. The first charge port receives a low or high charging voltage from the station. The second charge port receives a low charging voltage. When the station can supply the high charging voltage to the first charge port, the controller establishes the S-connected configuration via the switches, and thereafter charges the battery system solely via the first charge port.Type: ApplicationFiled: April 12, 2022Publication date: July 28, 2022Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Lei Hao, Yue-Yun Wang, Suresh Gopalakrishnan, Chandra S. Namuduri, Rashmi Prasad, Madhusudan Raghavan
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Publication number: 20220232723Abstract: A busbar assembly includes a base having a width and a length. The base has a first surface and a second surface and has a first side and a second side. A distance between the first side and the second side comprises the width, and the base defines a slot centered between approximately 75% and approximately 79% of the width.Type: ApplicationFiled: January 20, 2021Publication date: July 21, 2022Inventors: Muhammad H. Alvi, Rashmi Prasad, Chandra S. Namuduri
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Patent number: 11395430Abstract: A busbar assembly includes a base having a width and a length. The base has a first surface and a second surface and has a first side and a second side. A distance between the first side and the second side comprises the width, and the base defines a slot centered between approximately 75% and approximately 79% of the width.Type: GrantFiled: January 20, 2021Date of Patent: July 19, 2022Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Muhammad H. Alvi, Rashmi Prasad, Chandra S. Namuduri
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Patent number: 11383607Abstract: A bi-directional electrical charging system for a motor vehicle includes a rechargeable energy storage system (RESS) configured to store a first voltage. The RESS is adapted for use with an off-board power source that is configured to store a second voltage. The system further includes an electric motor having a plurality of machine windings. The system further includes a power inverter disposed between the RESS and the off-board power source. The system is movable to a forward buck mode, a reverse buck mode, a forward boost mode, and a reverse boost mode for selectively delivering electrical power from one of the RESS and the off-board power source to the other of the RESS and the off-board power source, in response to the power inverter cycling between at least two of the ON state, the RESS OFF state, and the external OFF state.Type: GrantFiled: March 22, 2021Date of Patent: July 12, 2022Assignee: GM Global Technology Operations LLCInventors: Rashmi Prasad, Chandra S. Namuduri
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Publication number: 20220201845Abstract: A bi-directional solid state switch includes: a first bus bar; a second bus bar; a first solid state switch implemented on a first printed circuit board (PCB), the first solid state switch including: a first control terminal; a first terminal electrically connected to the first bus bar; and a second terminal; and a second solid state switch implemented on a second PCB, the second solid state switch including: a second control terminal; a third terminal electrically connected to the second terminal of the first solid state switch; and a fourth terminal electrically connected to the second bus bar.Type: ApplicationFiled: December 23, 2020Publication date: June 23, 2022Inventors: Rashmi PRASAD, Chandra S. NAMUDURI, Muhammad H. ALVI
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Publication number: 20220190395Abstract: A battery system includes a plurality of battery modules electrically connected in series. Each of the battery modules includes: one or more battery cells; a first switch connected between a positive reference potential of the one or more battery cells and a first node; and a second switch connected between the first node and a second node, where a negative reference potential of the one or more battery cells is connected to the second node. A management module is configured to: selectively close the first switches of the battery modules while the second switches are open; and selectively close the second switch of one of the battery modules while the first switch of the one of the battery modules is open.Type: ApplicationFiled: December 15, 2020Publication date: June 16, 2022Inventors: Chandra S. Namuduri, Suresh Gopalakrishnan, Rashmi Prasad
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Patent number: 11349470Abstract: A circuitry includes an electronic solid-state switch including a first power terminal and a second power terminal and a driver and switch protection system electrically connected to the electronic solid-state switch. The driver and switch protection system includes an isolated bias power circuit configured to output a direct current voltage of at least fifteen volts, a current buffer circuit electrically connected between the isolated bias power circuit and the electronic solid-state switch, and a snubber circuit electrically connected to the first power terminal and the second power terminal.Type: GrantFiled: November 7, 2019Date of Patent: May 31, 2022Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Chandra S. Namuduri, Rashmi Prasad
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Patent number: 11336101Abstract: A system for use with a direct current fast-charging (DCFC) station includes a controller and battery system. The battery system includes first and second battery packs, and first, second, and third switches. The switches have ON/OFF conductive states commanded by the controller to connect the battery packs in a parallel-connected (P-connected) or series-connected (S-connected) configuration. An electric powertrain with one or more electric machines is powered via the battery system. First and second charge ports of the system are connectable to the station via a corresponding charging cable. The first charge port receives a low or high charging voltage from the station. The second charge port receives a low charging voltage. When the station can supply the high charging voltage to the first charge port, the controller establishes the S-connected configuration via the switches, and thereafter charges the battery system solely via the first charge port.Type: GrantFiled: February 3, 2020Date of Patent: May 17, 2022Assignee: GM Global Technology Operations LLCInventors: Lei Hao, Yue-Yun Wang, Suresh Gopalakrishnan, Chandra S. Namuduri, Rashmi Prasad, Madhusudan Raghavan
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Patent number: 11316335Abstract: A disconnect device includes a mounting plate having a thermally conductive substrate applied onto the mounting plate. A first layer of an electrically conductive material is applied onto the substrate. A semiconductor switch supported on the first layer connects or disconnects an input power source to or from a load. A second layer of an electrically conductive material applied onto the substrate is electrically isolated from the first layer. An electronic sensing, control and protection circuit is supported on the second layer and is connected to the semiconductor switch to control operation of the semiconductor switch. A control unit in communication with the electronic sensing, control and protection circuit via an electrically isolated control path provides control and communication between the electronic sensing, control and protection circuit and the semiconductor switch.Type: GrantFiled: April 30, 2020Date of Patent: April 26, 2022Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Chandra S. Namuduri, Rashmi Prasad, Thomas W. Nehl, David J. Brooks
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Publication number: 20220089042Abstract: A method for operating an advanced driver assistance (ADAS) system of a motor vehicle includes a vehicle controller receiving, from side and end cameras mounted to the vehicle, camera signals indicative of real-time images of outboard-facing side and end views of the vehicle. The controller determines a region of interest (ROI) inset within each end/side view within which is expected foreign objects and/or hazards. These ROIs are analyzed to detect if a foreign object/hazard is present in the vehicle's end and/or side views. Responsive to detecting the foreign object/hazard, movement of the foreign object/hazard is tracked to determine if the foreign object/hazard moves towards or away from the vehicle's underbody region. If the foreign object/hazard moves to the underbody region, control signals are transmitted to the vehicle's propulsion and/or steering system to automate preventative action that prevents collision of the vehicle with and/or removes the foreign object/hazard from the underbody.Type: ApplicationFiled: December 6, 2021Publication date: March 24, 2022Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Rashmi Prasad, Chandra S. Namuduri, Sai Vishnu Aluru, Christopher A. Stanek
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Patent number: 11225153Abstract: A method for operating an advanced driver assistance (ADAS) system of a motor vehicle includes a vehicle controller receiving, from side and end cameras mounted to the vehicle, camera signals indicative of real-time images of outboard-facing side and end views of the vehicle. The controller determines a region of interest (ROI) inset within each end/side view within which is expected foreign objects and/or hazards. These ROIs are analyzed to detect if a foreign object/hazard is present in the vehicle's end and/or side views. Responsive to detecting the foreign object/hazard, movement of the foreign object/hazard is tracked to determine if the foreign object/hazard moves towards or away from the vehicle's underbody region. If the foreign object/hazard moves to the underbody region, control signals are transmitted to the vehicle's propulsion and/or steering system to automate preventative action that prevents collision of the vehicle with and/or removes the foreign object/hazard from the underbody.Type: GrantFiled: February 3, 2020Date of Patent: January 18, 2022Assignee: GM Global Technology Operations LLCInventors: Rashmi Prasad, Chandra S. Namuduri, Sai Vishnu Aluru, Christopher A. Stanek
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Publication number: 20210402887Abstract: A method of controlling fast charging of at least one battery pack within a high voltage electrical propulsion system includes identifying an operating condition, wherein the operating condition is one of charging mode and propulsion mode, and, when the electrical system is in charging mode, initiating charging of the at least one battery pack, terminating charging of the at least one battery pack and connecting the at least one battery pack to power components of the electrical propulsion system when there is a request to terminate charging of the at least one battery pack, and terminating charging of the at least one battery pack and connecting the at least one battery pack to power components of the electrical propulsion system when there is no request to terminate charging of the at least one battery pack and the charging of the at least one battery pack is complete.Type: ApplicationFiled: June 29, 2020Publication date: December 30, 2021Inventors: Rashmi Prasad, Chandra S. Namuduri, Suresh Gopalakrishnan, Thomas W. Nehl
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Patent number: 11203267Abstract: A dual-voltage charging station system for an alternating current (“AC”) power supply and a mobile platform having a charging port includes a charge coupler, an AC-to-DC conversion stage, a cable, and a controller. The charge coupler has AC pins and direct current (“DC”) pins configured to engage with respective AC and DC receptacles of the charging port. The conversion stage is connected to the charge coupler and the AC power supply, converts the supply voltage to a DC charging voltage, and relays an appropriate AC or DC accessory voltage. The cable connects to the charge coupler such that the AC pins receive the accessory voltage and the DC pins receive the DC charging voltage. The controller simultaneously delivers the accessory voltage and the DC voltage to the mobile platform via the AC pins and the DC pins, respectively.Type: GrantFiled: September 23, 2019Date of Patent: December 21, 2021Assignee: GM Global Technology Operations LLCInventors: Rashmi Prasad, Chandra S. Namuduri
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Patent number: 11171571Abstract: An AC electronic solid-state switch includes an electrically insulating and thermally conductive layer, a first electrically conductive trace, a second electrically conductive trace, and a plurality of semiconductor dies each electrically connected to the first electrically conductive trace and the second electrically conductive trace. Each of the plurality of semiconductor dies forms a MOSFET, IGBT or other types of electronically controllable switch. The AC electronic solid-state switch further includes a common drain conductor that is electrically connected to each drain terminal of the plurality of semiconductor dies. The AC electronic solid-state switch is configured to block between 650 volts and 1700 volts in the off-state in a first direction and a second direction, the second direction being opposite the first direction, and the AC electronic solid-state switch is configured to carry at least 500 A continuously in the on-state with a voltage drop of less than 2V.Type: GrantFiled: November 5, 2019Date of Patent: November 9, 2021Assignee: GM Global Technology Operations LLCInventors: Rashmi Prasad, Chandra S. Namuduri
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Publication number: 20210344187Abstract: A disconnect device includes a mounting plate having a thermally conductive substrate applied onto the mounting plate. A first layer of an electrically conductive material is applied onto the substrate. A semiconductor switch supported on the first layer connects or disconnects an input power source to or from a load. A second layer of an electrically conductive material applied onto the substrate is electrically isolated from the first layer. An electronic sensing, control and protection circuit is supported on the second layer and is connected to the semiconductor switch to control operation of the semiconductor switch. A control unit in communication with the electronic sensing, control and protection circuit via an electrically isolated control path provides control and communication between the electronic sensing, control and protection circuit and the semiconductor switch.Type: ApplicationFiled: April 30, 2020Publication date: November 4, 2021Inventors: Chandra S. Namuduri, Rashmi Prasad, Thomas W. Nehl, David J. Brooks
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Publication number: 20210286418Abstract: A solid-state switch assembly includes a base plate and an electrically insulating layer affixed to the base plate. First, second, third, and fourth power traces are affixed to the electrically insulating layer. First semiconductor devices are arranged on the first power trace to control power flow between the first power trace and the second power trace, second semiconductor devices are arranged on the second power trace to control power flow between the second power trace and the third power trace, and third semiconductor devices are arranged on the third power trace to control power flow between the third and fourth power traces. A first signal conductor communicates with the first semiconductor devices. A second signal conductor communicates with the second semiconductor devices. A third signal conductor communicates with the third semiconductor devices.Type: ApplicationFiled: March 16, 2020Publication date: September 16, 2021Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Chandra S. Namuduri, Rashmi Prasad
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Publication number: 20210237716Abstract: A method for operating an advanced park assist system of a vehicle includes a vehicle controller receiving, from front and side cameras mounted proximate front and side sections of the vehicle, real-time images of the vehicle's forward-facing and side-facing views. These images are analyzed to detect target elements present in the vehicle's forward-facing and/or side-facing views. Responsive to detecting a target element, heading control signals are transmitted to the vehicle's steering system to reposition the vehicle and thereby locate the target element at the center of the forward-facing view and at the top of the side-facing view. Speed control signals are transmitted to the vehicle's propulsion system to propel the vehicle such that the target element disappears from the side-facing view and moves to a calibrated distance from the vehicle body's front end. The control signals are modulated to align the vehicle with a target marker of the target element.Type: ApplicationFiled: February 3, 2020Publication date: August 5, 2021Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Rashmi Prasad, Sai Vishnu Aluru, Chandra S. Namuduri, Christopher A. Stanek
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Publication number: 20210237594Abstract: A method for operating an advanced driver assistance (ADAS) system of a motor vehicle includes a vehicle controller receiving, from side and end cameras mounted to the vehicle, camera signals indicative of real-time images of outboard-facing side and end views of the vehicle. The controller determines a region of interest (ROI) inset within each end/side view within which is expected foreign objects and/or hazards. These ROIs are analyzed to detect if a foreign object/hazard is present in the vehicle's end and/or side views. Responsive to detecting the foreign object/hazard, movement of the foreign object/hazard is tracked to determine if the foreign object/hazard moves towards or away from the vehicle's underbody region. If the foreign object/hazard moves to the underbody region, control signals are transmitted to the vehicle's propulsion and/or steering system to automate preventative action that prevents collision of the vehicle with and/or removes the foreign object/hazard from the underbody.Type: ApplicationFiled: February 3, 2020Publication date: August 5, 2021Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Rashmi Prasad, Chandra S. Namuduri, Sai Vishnu Aluru, Christopher A. Stanek