Patents by Inventor Sayeed Ahmed
Sayeed Ahmed 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).
-
Patent number: 10284129Abstract: A system includes a three phase AC or brushless DC motor, an inverter and a controller. The inverter is electrically coupled to the motor. The controller is -electrically coupled to the inverter. The controller is configured to control the inverter to deliver a three phase pulse width modulated voltage to the AC motor, wherein the three phase pulse width modulation comprises a repeating two-cycle pattern.Type: GrantFiled: August 30, 2016Date of Patent: May 7, 2019Assignee: EATON INTELLIGENT POWER LIMITEDInventors: Sayeed Ahmed Mir, John David Neely, Stan Lawrence Seely, John Mendenhall White
-
Publication number: 20170126224Abstract: A system comprises a power device, a gate driver integrated circuit and an isolated voltage supply. The power device has a gate and is configured to turn on in response to a control voltage applied at the gate. The gate driver integrated circuit is electrically coupled to the gate and is configured to supply the control voltage without the use of a bootstrap circuit. The isolated voltage supply comprises a negative voltage supply that is electrically coupled to the gate of the power device.Type: ApplicationFiled: October 27, 2016Publication date: May 4, 2017Inventors: Stan Lawrence Seely, Sayeed Ahmed Mir
-
Publication number: 20170077856Abstract: A system includes a three phase AC or brushless DC motor, an inverter and a controller. The inverter is electrically coupled to the motor. The controller is -electrically coupled to the inverter. The controller is configured to control the inverter to deliver a three phase pulse width modulated voltage to the AC motor, wherein the three phase pulse width modulation comprises a repeating two-cycle pattern.Type: ApplicationFiled: August 30, 2016Publication date: March 16, 2017Inventors: Sayeed Ahmed Mir, John David Neely, Stan Lawrence Seely, John Mendenhall White
-
Patent number: 9136845Abstract: A level shifter includes a first branch and a second branch. A trigger of the first branch is coupled to a low voltage input, an inverted high voltage output and a ground. A latch of the first branch is coupled to the inverted high voltage output and a high voltage output. A power gate of the first branch is coupled to an inverted low voltage input, the latch of the first branch and a high voltage supply. A trigger of the second branch is coupled to the inverted low voltage input, the high voltage output and the ground. A latch of the second branch is coupled to the high voltage output and the inverted high voltage output. A power gate of the second branch is coupled to the low voltage input, the latch of the second branch and the high voltage supply.Type: GrantFiled: February 13, 2014Date of Patent: September 15, 2015Assignee: Freescale Semiconductor, Inc.Inventors: Sayeed Ahmed Badrudduza, Alexander Bernhard Hoefler
-
Publication number: 20150229307Abstract: A level shifter includes a first branch and a second branch. A trigger of the first branch is coupled to a low voltage input, an inverted high voltage output and a ground. A latch of the first branch is coupled to the inverted high voltage output and a high voltage output. A power gate of the first branch is coupled to an inverted low voltage input, the latch of the first branch and a high voltage supply. A trigger of the second branch is coupled to the inverted low voltage input, the high voltage output and the ground. A latch of the second branch is coupled to the high voltage output and the inverted high voltage output. A power gate of the second branch is coupled to the low voltage input, the latch of the second branch and the high voltage supply.Type: ApplicationFiled: February 13, 2014Publication date: August 13, 2015Inventors: Sayeed Ahmed Badrudduza, Alexander Bernhard Hoefler
-
Patent number: 7920409Abstract: A Static Random Access Memory (SRAM) cell having high stability and low leakage is provided. The SRAM cell includes a pair of cross-coupled inverters providing differential storage of a data bit. Power to the SRAM cell is provided by a read word line (RWL) signal, which is also referred to herein as a read control signal. During read operations, the RWL signal is pulled to a voltage level that forces the SRAM cell to a full-voltage state. During standby, the RWL signal is pulled to a voltage level that forces the SRAM cell to a voltage collapsed state in order to reduce leakage current, or leakage power, of the SRAM cell. A read-transistor providing access to the bit stored by the SRAM cell is coupled to the SRAM cell via a gate of the read transistor, thereby decoupling the stability of the SRAM cell from the read operation.Type: GrantFiled: June 5, 2007Date of Patent: April 5, 2011Assignee: Arizona Board of Regents for and on behalf of Arizona State UniversityInventors: Lawrence T. Clark, Sayeed Ahmed Badrudduza
-
Patent number: 7505294Abstract: A tri-level inverter power module has an architecture employing a high degree of modularity that allows a base power module to be quickly, easily, and cost effectively configured to address a large variety of applications.Type: GrantFiled: September 9, 2003Date of Patent: March 17, 2009Assignee: Continental Automotive Systems US, Inc.Inventors: Sayeed Ahmed, Fred Flett, Ajay V. Patwardhan, Douglas K. Maly
-
Patent number: 7456602Abstract: A system and method for controlling power converters are disclosed. Briefly described, one embodiment is a method comprising communicating at least one first control signal to an alternating current/direct current (AC/DC) power converter from a multi-converter system controller, the AC/DC power converter and the multi-converter system controller residing in a power system electronics housing, and communicating at least one second control signal to a direct current/direct current (DC/DC) power converter from the multi-converter system controller, the DC/DC power converter residing in a power system electronics housing.Type: GrantFiled: November 18, 2005Date of Patent: November 25, 2008Assignee: Continental Automotive Systems US, Inc.Inventors: Richard J. Hampo, John M. Van Dyke, Lizhi Zhu, Sayeed Ahmed
-
Patent number: 7443692Abstract: A power converter utilizes a high frequency capacitor and a bulk capacitor coupled across the DC terminals to reduce high frequency effect and voltage overshoot, leading to space and cost savings in power converter design. Each capacitor may be physically coupled adjacent the gate driver board via clips, clamps, and/or fasteners.Type: GrantFiled: September 17, 2003Date of Patent: October 28, 2008Assignee: Continental Automotive Systems US, Inc.Inventors: Ajay V. Patwardhan, Douglas K. Maly, Sayeed Ahmed, Fred Flett
-
Patent number: 7301755Abstract: Power converters such as power modules configured as inverters employ modularized approaches. In some aspects, semiconductor devices are thermally coupled directly to thermally conductive substrates without intervening dielectric or insulative structures. Additionally, or alternatively, semiconductor devices are thermally coupled to thermally conductive substrates with relatively large surface areas before heat transferred from the semiconductor devices encounters a dielectric or electrically insulating structure with correspondingly high thermal impedance.Type: GrantFiled: December 13, 2004Date of Patent: November 27, 2007Assignee: Siemens VDO Automotive CorporationInventors: Pablo Rodriguez, Douglas K. Maly, Ajay V. Patwardhan, Kanghua Chen, Sayeed Ahmed, Gerardo Jimenez, Fred Flett
-
Patent number: 7292451Abstract: Power converters such as power modules configured as inverters employ modularized approaches. In some aspects, semiconductor devices are thermally coupled directly to thermally conductive substrates without intervening dielectric or insulative structures. Additionally, or alternatively, semiconductor devices are thermally coupled to thermally conductive substrates with relatively large surface areas before heat transferred from the semiconductor devices encounters a dielectric or electrically insulating structure with correspondingly high thermal impedance.Type: GrantFiled: December 13, 2004Date of Patent: November 6, 2007Assignee: Siemens VDO Automotive CorporationInventors: Pablo Rodriguez, Douglas K. Maly, Ajay V. Patwardhan, Kanghua Chen, Sayeed Ahmed, Gerardo Jimenez, Fred Flett
-
Patent number: 7289343Abstract: Power converters such as power modules configured as inverters employ modularized approaches. In some aspects, semiconductor devices are thermally coupled directly to thermally conductive substrates without intervening dielectric or insulative structures. Additionally, or alternatively, semiconductor devices are thermally coupled to thermally conductive substrates with relatively large surface areas before heat transferred from the semiconductor devices encounters a dielectric or electrically insulating structure with correspondingly high thermal impedance.Type: GrantFiled: December 13, 2004Date of Patent: October 30, 2007Assignee: Siemens VDO Automotive CorporationInventors: Pablo Rodriguez, Douglas K. Maly, Ajay V. Patwardhan, Kanghua Chen, Sayeed Ahmed, Gerardo Jimenez, Fred Flett
-
Patent number: 7289329Abstract: A power converter integrates at least one planar transformer comprising a multi-layer transformer substrate and/or at least one planar inductor comprising a multi-layer inductor substrate with a number of power semiconductor switches physically and thermally coupled to a heat sink via one or more multi-layer switch substrates.Type: GrantFiled: October 12, 2004Date of Patent: October 30, 2007Assignee: Siemens VDO Automotive CorporationInventors: Kanghua Chen, Sayeed Ahmed, Lizhi Zhu
-
Publication number: 20070193763Abstract: A DC bus for use in a power module has a positive DC conductor bus plate parallel with a negative DC conductor bus plate. One or more positive leads are connected to the positive bus and are connectable to a positive terminal of a power source. One or more negative leads are connected to the negative bus and are connectable to a negative terminal of a power source. The DC bus has one or more positive connections fastenable from the positive bus to the high side of a power module. The DC bus also has one or more negative connections fastenable from the negative bus to the low side of the power module. The positive bus and negative bus permit counter-flow of currents, thereby canceling magnetic fields and their associated inductances, and the positive and negative bus are connectable to the center portion of a power module.Type: ApplicationFiled: February 9, 2007Publication date: August 23, 2007Inventors: Scott Parkhill, Sayeed Ahmed, Fred Flett
-
Publication number: 20070114954Abstract: A system and method for controlling power converters are disclosed. Briefly described, one embodiment is a method comprising communicating at least one first control signal to an alternating current/direct current (AC/DC) power converter from a multi-converter system controller, the AC/DC power converter and the multi-converter system controller residing in a power system electronics housing, and communicating at least one second control signal to a direct current/direct current (DC/DC) power converter from the multi-converter system controller, the DC/DC power converter residing in a power system electronics housing.Type: ApplicationFiled: November 18, 2005Publication date: May 24, 2007Inventors: Richard Hampo, John Van Dyke, Lizhi Zhu, Sayeed Ahmed
-
Patent number: 7193860Abstract: A DC bus for use in a power module has a positive DC conductor bus plate parallel with a negative DC conductor bus plate. One or more positive leads are connected to the positive bus and are connectable to a positive terminal of a power source. One or more negative leads are connected to the negative bus and are connectable to a negative terminal of a power source. The DC bus has one or more positive connections fastenable from the positive bus to the high side of a power module. The DC bus also has one or more negative connections fastenable from the negative bus to the low side of the power module. The positive bus and negative bus permit counter-flow of currents, thereby canceling magnetic fields and their associated inductances, and the positive and negative bus are connectable to the center portion of a power module.Type: GrantFiled: December 2, 2005Date of Patent: March 20, 2007Assignee: Ballard Power Systems CorporationInventors: Scott Parkhill, Sayeed Ahmed, Fred Flett
-
Patent number: 7187558Abstract: A DC bus for use in a power module has a positive DC conductor bus plate parallel with a negative DC conductor bus plate. One or more positive leads are connected to the positive bus and are connectable to a positive terminal of a power source. One or more negative leads are connected to the negative bus and are connectable to a negative terminal of a power source. The DC bus has one or more positive connections fastenable from the positive bus to the high side of a power module. The DC bus also has one or more negative connections fastenable from the negative bus to the low side of the power module. The positive bus and negative bus permit counter-flow of currents, thereby canceling magnetic fields and their associated inductances, and the positive and negative bus are connectable to the center portion of a power module.Type: GrantFiled: October 6, 2005Date of Patent: March 6, 2007Assignee: Ballard Power Systems CorporationInventors: Scott T. Parkhill, Sayeed Ahmed, Fred Flett
-
Patent number: 7180763Abstract: A power converter comprising a DC/AC bridge circuit electrically coupled between positive and negative DC bus terminals and a set of phase terminals, a DC/DC bridge circuit electrically coupled to the positive and negative DC bus terminals and a set of DC bridge terminals. The power converter may be configured to control the transfer of power to and/or from the DC bridge terminals and to control the transfer of power to and/or from the AC phase terminals.Type: GrantFiled: September 21, 2004Date of Patent: February 20, 2007Assignee: Ballard Power Systems CorporationInventors: Ajay V. Patwardhan, Douglas K. Maly, Fred Flett, Sayeed Ahmed, Pablo Rodriguez, Kanghua Chen, Gerardo Jimenez
-
Publication number: 20060274561Abstract: A tri-level inverter power module has an architecture employing a high degree of modularity that allows a base power module to be quickly, easily, and cost effectively configured to address a large variety of applications.Type: ApplicationFiled: September 9, 2003Publication date: December 7, 2006Applicant: Ballard Power Systems CorporationInventors: Sayeed Ahmed, Fred Flett, Ajay Patwardhan, Douglas Maly
-
Publication number: 20060152085Abstract: Power converter system topologies comprise a first DC/DC converter to pull a positive rail of a high voltage bus up, while a second DC/DC converter pushes a negative rail of the high voltage bus down. One or both the DC/DC converters may be bi-directional. Such topologies are suitable for use with separate primary power sources, and/or auxiliary power sources. Such topologies may include a DC/AC converter, which may be bi-directional. Such topologies may include one or more auxiliary DC/DC converters, which may be bi-directional. Multiple substrates, including at least one stacked above another may enhance packaging.Type: ApplicationFiled: October 20, 2005Publication date: July 13, 2006Inventors: Fred Flett, Lizhi Zhu, Sayeed Ahmed, Ajay Patwardhan, Roy Davis