Patents by Inventor Shailesh N. Joshi

Shailesh N. Joshi 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).

  • Publication number: 20230019971
    Abstract: Embodiments described herein generally relate a multi-mode heat transfer system. The heat transfer system includes an emitter device. The emitter device includes an inner core, a composite material pattern, and a surface coating pattern. The inner core is surrounded by an outer core having a thickness and an outer surface. The composite material pattern extends through at least a portion of the outer surface and at least a portion of the thickness of the outer core and is thermally coupled to the inner core. The surface coating pattern is on the outer surface and is changeable between a low emissivity state and a high emissivity state based on a surface temperature of the emitter device. In the low emissivity state, the emitter device transmits an omni-directional radiation and, in the high emissivity state, the emitter device transmits a focused radiation via the composite material pattern.
    Type: Application
    Filed: July 16, 2021
    Publication date: January 19, 2023
    Applicant: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Shailesh N. Joshi, Ercan M. Dede
  • Patent number: 11545874
    Abstract: An electronic assembly includes a flexible printed circuit board (PCB) circumferentially disposed around a motor and a thermal management assembly (TMA) thermally connected to the flexible PCB. One or more switching semiconductor devices are disposed on a first surface of the flexible PCB. The TMA includes a cooling jacket, at least one jacket manifold formed through the cooling jacket and a thermal compensation base layer thermally coupled to the cooling jacket. The cooling jacket is mounted around a circumference of the motor and has a mounting surface concentric with the circumference of the motor. The mounting surface is coupled to the first surface of the flexible PCB. The at least one jacket manifold has a fluid inlet and a fluid outlet defining a fluid flow area therebetween. The thermal compensation base layer is thermally coupled to the cooling jacket and the one or more switching semiconductor devices.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: January 3, 2023
    Assignee: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC.
    Inventors: Shailesh N. Joshi, Shohei Suenaga
  • Patent number: 11533012
    Abstract: An integrated power control assembly mounted on an axial end of a three-phase motor includes a substrate, two input busbars each of positive and negative polarities alternatively spaced apart on the substrate, a plurality of sets of paired devices, and three output busbars corresponding to the three phases of the motor, wherein a set of paired devices includes a switching semiconductor and a diode. An inner input busbar has edges adjacent to an inner input busbar of opposite polarity and an outer input busbar of opposite polarity and configured to have at least twice as many devices as the outer input busbars. One or more sets of paired devices are disposed axially on outer input busbars and on inner input busbars along the edges. An individual output busbar is disposed over and electrically coupled to one or more sets of paired devices disposed on adjacent input busbars of opposite polarity.
    Type: Grant
    Filed: June 19, 2020
    Date of Patent: December 20, 2022
    Assignee: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC.
    Inventors: Shohei Suenaga, Shailesh N. Joshi, Danny J. Lohan, Yanghe Liu
  • Patent number: 11527458
    Abstract: A 2-in-1 power electronics assembly includes a frame with a lower dielectric layer, an upper dielectric layer spaced apart from the lower dielectric layer, and a sidewall disposed between and coupled to the lower dielectric layer and the upper dielectric layer. The lower dielectric layer includes a lower cooling fluid inlet and the upper dielectric layer includes an upper cooling fluid outlet. A first semiconductor device assembly and a second semiconductor device assembly are included and disposed within the frame. The first semiconductor device is disposed between a first lower metal inverse opal (MIO) layer and a first upper MIO layer, and the second semiconductor device is disposed between a second lower MIO layer and a second upper MIO layer. An internal cooling structure that includes the MIO layers provides double sided cooling for the first semiconductor device and the second semiconductor device.
    Type: Grant
    Filed: September 13, 2019
    Date of Patent: December 13, 2022
    Assignee: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC.
    Inventors: Ercan Mehmet Dede, Shailesh N. Joshi
  • Publication number: 20220361353
    Abstract: Methods, systems, and apparatus for a module electronics package. The modular electronics package includes a main circuit. The first main circuit board is configured to provide electrical interconnections to form an electric circuit. The modular electronics package includes a first power module. The first power module includes a first power device card and a first expansion slot. The first power device card is configured to be inserted into the first expansion slot and to be electrically coupled to the main circuit board via the first expansion slot.
    Type: Application
    Filed: May 5, 2021
    Publication date: November 10, 2022
    Inventors: Danny Lohan, Shailesh N. Joshi
  • Publication number: 20220341668
    Abstract: A cooling system that includes an expandable vapor chamber having a condenser side opposite an evaporator side, a condenser side wick coupled to a condenser side wall, an evaporator side wick coupled to an evaporator side wall, and a vapor core positioned between the evaporator side wick and the condenser side wick. The cooling system also includes a vapor pressure sensor communicatively coupled to a controller and a bellow actuator disposed in the vapor core and communicatively coupled to the controller. The bellow actuator is expandable based on a vapor pressure measurement of the vapor pressure sensor.
    Type: Application
    Filed: July 8, 2022
    Publication date: October 27, 2022
    Applicants: Toyota Motor Engineering & Manufacturing North America, Inc., Purdue Research Foundation
    Inventors: Shailesh N. Joshi, Srivathsan Sudhakar
  • Patent number: 11483951
    Abstract: A method for forming an assembly is provided. The method includes depositing a colloidal template onto a substrate, wherein the colloidal template is porous, depositing a metal layer onto and within the colloidal template, depositing a cap structure onto the colloidal template opposite of the substrate, and removing the colloidal template from between the substrate and the cap structure to form a metal inverse opal structure disposed therebetween. The method continues by depositing an electrical isolation layer in contact with the cap structure opposite the metal inverse opal structure, and attaching the electrical isolation layer to a cooling device.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: October 25, 2022
    Assignees: Toyota Motor Engineering & Manufacturing North America, Inc., The Board of Trustees of the University of Illinois
    Inventors: Shailesh N. Joshi, Paul Braun, Julia Kohanek, Gaurav Singhal
  • Patent number: 11476737
    Abstract: An integrated power control assembly configured as an inverter for a motor is mounted directly on an axial end of the motor. The integrated power control assembly includes one or more power plates, one or more cooling plates coaxially disposed on and thermally connected to the one or more power plates, and one or more circuit boards circumferentially disposed around the one or more power plates. An individual power plate has a power card having one or more switching semiconductor devices corresponding to individual phases of the motor. The individual power card is electrically coupled to the motor through one or more busbars. An individual circuit board is electrically coupled to an individual power card corresponding to an individual phase of the motor. The individual circuit board has a first surface electrically coupled to the one or more power plates and a second surface opposite to the first surface.
    Type: Grant
    Filed: March 13, 2020
    Date of Patent: October 18, 2022
    Assignee: Toyota Motor Engineering & Manufacturing North America. Inc.
    Inventors: Shailesh N. Joshi, Yanghe Liu, Fa Chen
  • Publication number: 20220319956
    Abstract: A power device assembly includes a heat-generating device, one or more porous bonding layers, and one or more cap layers. The one or more porous bonding layers are formed on a surface of the heat-generating device and define a plurality of embedded vapor channels. The one or more cap layers are engaged with a porous bonding layer of the one or more porous bonding layers opposite the heat-generating device. The one or more cap layer comprise a plurality of liquid feed channels for feeding cooling fluid to the heat-generating device via the porous bonding layer.
    Type: Application
    Filed: March 30, 2021
    Publication date: October 6, 2022
    Applicant: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Shailesh N. Joshi, Ercan Mehmet Dede, Feng Zhou, Hiroshi Ukegawa, Danny Lohan
  • Publication number: 20220322582
    Abstract: A system includes a power device unit coupled to a substrate. An upper cooling assembly is thermally coupled to an upper side of the substrate. A lower cooling assembly is thermally coupled to a lower side of the substrate. A gate driver unit is coupled to the upper cooling assembly. At least one upper via is formed through the upper cooling electrically coupling the gate driver unit to the power device unit. A capacitor unit is coupled to the lower cooling assembly. At least one lower via formed through the lower cooling assembly electrically coupling the capacitor unit to the power device unit.
    Type: Application
    Filed: March 31, 2021
    Publication date: October 6, 2022
    Applicant: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Hitoshi Fujioka, Shailesh N. Joshi
  • Publication number: 20220320031
    Abstract: A power electronics module includes a glass layer with one or more vias extending through the glass layer and having an electrically and thermally conductive material disposed within the one or more vias, a power electronic device directly bonded to a first surface of the glass layer, and, a cooling structure thermally coupled to a second surface of the glass layer.
    Type: Application
    Filed: March 31, 2021
    Publication date: October 6, 2022
    Applicant: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Shailesh N. Joshi, Hiroshi Ukegawa
  • Publication number: 20220314211
    Abstract: A method of fabricating a carbon nanotube (“CNT”) array includes providing a substrate with a CNT catalyst disposed on a surface of the substrate, heating the CNT catalyst to an annealing temperature, exposing the CNT catalyst to a CNT precursor for an exposure period to pre-load the CNT catalyst, and exposing the pre-loaded CNT catalyst to a carbon source for a growth period to form the CNT array. The formed CNT array comprises a plurality of CNT bundles that are aligned with one another in an alignment direction. At least one of the plurality of bundles comprises an average structural factor of 1.5 or less along an entirety of the length thereof.
    Type: Application
    Filed: March 31, 2021
    Publication date: October 6, 2022
    Applicants: Toyota Motor Engineering & Manufacturing North America, Inc., Vanderbilt University
    Inventors: Yuyang Song, Shailesh N. Joshi, Piran R. Kidambi, Peifu Cheng
  • Patent number: 11457544
    Abstract: A two-phase cold plate includes an outer enclosure having a fluid inlet and a fluid outlet each fluidly coupled to a fluid pathway, an inner enclosure having a vapor cavity and a vapor outlet, and one or more wicking structures disposed in the outer enclosure. The one or more wicking structures fluidly couple the fluid pathway of the outer enclosure with the vapor cavity of the inner enclosure and the one or more wicking structures comprise a plurality of nucleation sites configured to induce vaporization of a cooling fluid and facilitate vapor flow into the vapor cavity of the inner enclosure.
    Type: Grant
    Filed: February 2, 2021
    Date of Patent: September 27, 2022
    Assignee: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC.
    Inventors: Shailesh N. Joshi, Danny Lohan, Hitoshi Fujioka, Feng Zhou
  • Publication number: 20220297609
    Abstract: A system for using an electrostatic force to cause an object to adhere to a surface of a vehicle can include an electrode and a device. The electrode can be configured to be disposed within a structure of the vehicle. The structure can define the surface. A shape of the electrode can define a shape of a region of the surface. The device can be configured to connect the electrode to a voltage source so that, at a time at which the electrode is connected to the voltage source, an electric charge is produced on the electrode to produce the electrostatic force capable of causing the object to adhere to the surface. For example, the surface can include a dashboard, a dashboard vent frame, a sunglasses holder cover, or the like. For example, the object can include a mobile device, a cup, a pair of sunglasses, or the like.
    Type: Application
    Filed: March 16, 2021
    Publication date: September 22, 2022
    Inventors: Ryohei Tsuruta, Shailesh N. Joshi, Umesh N. Gandhi
  • Patent number: 11415370
    Abstract: A cooling system that includes an expandable vapor chamber having a condenser side opposite an evaporator side, a condenser side wick coupled to a condenser side wall, an evaporator side wick coupled to an evaporator side wall, and a vapor core positioned between the evaporator side wick and the condenser side wick. The cooling system also includes a vapor pressure sensor communicatively coupled to a controller and a bellow actuator disposed in the vapor core and communicatively coupled to the controller. The bellow actuator is expandable based on a vapor pressure measurement of the vapor pressure sensor.
    Type: Grant
    Filed: September 4, 2019
    Date of Patent: August 16, 2022
    Assignees: TOYOTA MOTOR ENGINEERING & MANUTACTURING NORTH AMERICA, INC., PURDUE RESEARCH FOUNDATION
    Inventors: Shailesh N. Joshi, Srivathsan Sudhaker
  • Publication number: 20220246492
    Abstract: A power electronics assembly includes a vapor chamber and a heat-generating device. The vapor chamber includes a housing defining an evaporator side and a condenser side and a pedestal integrally formed with an extending from the evaporator side, the pedestal comprising a non-rectangular shape corresponding to a thermal management objective. The heat-generating device is coupled to the pedestal.
    Type: Application
    Filed: February 2, 2021
    Publication date: August 4, 2022
    Applicant: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Shailesh N. Joshi, Ercan Mehmet Dede
  • Patent number: 11386544
    Abstract: An electronics system may include a substrate, an electronic device bonded to the substrate, a plurality of photoluminescent particles disposed on the electronic device, an illuminator, a sensor, and a control module. The illuminator can illuminate the electronic device. The sensor can capture a first set of positions of the photoluminescent particles on the electronic device when the electronic device is not operating under a load and a second set of positions of the photoluminescent particles when the electronic device is operating under a load. The control module can determine thermomechanical stress on the electronic device based at least in part on a difference between the first set of positions and the second set of positions.
    Type: Grant
    Filed: October 30, 2019
    Date of Patent: July 12, 2022
    Assignee: TOYOTA MOTOR ENGINEEEING & MANUFACTURING NORTH AMERICA, INC.
    Inventors: Shailesh N. Joshi, Umesh Gandhi, Vishnu Sundaresan, Vijay Venkatesh, Srivatsava Krishnan
  • Patent number: 11387506
    Abstract: A thermal management system for removing waste heat from a battery cell. The thermal management system includes a unit cell that includes a vapor chamber including an evaporator surface and a condenser surface. The evaporator surface and the condenser surface are fluidly connected by a wick. The unit cell also includes a phase change material (PCM) shell encapsulating a PCM. The evaporator surface is thermally coupled to the battery cell and absorbs waste heat generated by the battery cell. The condenser surface is thermally coupled to the PCM and rejects waste heat to the PCM.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: July 12, 2022
    Assignee: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC.
    Inventors: Ercan Mehmet Dede, Shailesh N. Joshi
  • Patent number: 11380604
    Abstract: A method of forming a textured surface layer along a substrate that includes disposing a plurality of polymer spheres on a surface of the metal substrate, and electroplating the metal substrate at a current density to deposit a metal layer along a body of each of the plurality of polymer spheres disposed on the surface of the metal substrate. The metal layer does not extend above a top surface of the plurality of polymer spheres. The method further includes removing the plurality of polymer spheres from the metal layer to form the textured surface defined by a size and shape of the plurality of polymer spheres.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: July 5, 2022
    Assignees: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC., THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: Shailesh N. Joshi, Paul Braun, Julia Kohanek, Gaurav Singhal
  • Patent number: 11374273
    Abstract: A battery module including a battery cell and a thermal management system for removing heat from the battery cell. The thermal management system includes two or more unit cells in an array. Each unit cell includes a primary shell comprising a primary phase change material (PCM), and a secondary shell comprising a secondary PCM that is thermally coupled to the primary shell. The battery cell is thermally coupled to the primary shell at a heat transfer interface and the secondary shells of adjacent unit cells in the array are separate.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: June 28, 2022
    Assignee: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Ercan Mehmet Dede, Shailesh N. Joshi