Patents by Inventor Vishwanathan Subramanian

Vishwanathan Subramanian 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).

  • Systems and methods for minimizing power dissipation in a low-power lamp coupled to a trailing-edge dimmer
    Patent number: 9215772
    Abstract: A controller may predict an estimated occurrence of a high-resistance state of a dimmer, wherein the high-resistance state occurs when the dimmer begins phase-cutting an alternating current voltage signal. The controller may also be configured to operate in a trailing-edge exposure mode for a period of time wherein the period of time includes a time of the estimated occurrence of the high-resistance state in order to allow the controller to detect the occurrence of the high-resistance state, wherein energy is transferred from an input to a dissipative element during the trailing-edge exposure mode. The controller may further be configured to minimize a time between a beginning of the period of time and the estimated occurrence of the high-resistance state by modifying the period of time based on an estimated charging time of a capacitor of the dimmer.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: December 15, 2015
    Assignee: Philips International B.V.
    Inventors: Mohit Sood, Vishwanathan Subramanian
  • SYSTEMS AND METHODS FOR MINIMIZING POWER DISSIPATION IN A LOW-POWER LAMP COUPLED TO A TRAILING-EDGE DIMMER
    Publication number: 20150305107
    Abstract: A controller may predict an estimated occurrence of a high-resistance state of a dimmer, wherein the high-resistance state occurs when the dimmer begins phase-cutting an alternating current voltage signal. The controller may also be configured to operate in a trailing-edge exposure mode for a period of time wherein the period of time includes a time of the estimated occurrence of the high-resistance state in order to allow the controller to detect the occurrence of the high-resistance state, wherein energy is transferred from an input to a dissipative element during the trailing-edge exposure mode. The controller may further be configured to minimize a time between a beginning of the period of time and the estimated occurrence of the high-resistance state by modifying the period of time based on an estimated charging time of a capacitor of the dimmer.
    Type: Application
    Filed: July 16, 2014
    Publication date: October 22, 2015
    Inventors: Mohit Sood, Vishwanathan Subramanian