Patents by Inventor Than Quoc Le

Than Quoc Le 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).

  • Switching systems and methods for use in uninterruptible power supplies
    Patent number: 9030045
    Abstract: The present invention may be embodied as an uninterruptible power supply comprising an input section, an output section, an inverter section, and a transformer. The transformer is operatively connected to the input section, the output section, and the inverter section. The uninterruptible power supply operates in a line mode and in a standby mode. In the standby mode, the output section generates an output power signal from a standby signal generated by the inverter section based on the alternative power source and at least one inverter control signal. When the uninterruptible power supply operates in the standby mode, the at least one inverter control signal is pulse-width modulated during at least a first portion of a cycle of the output power signal and not pulse-width modulated during at least a second portion of the cycle of the output power signal.
    Type: Grant
    Filed: January 17, 2012
    Date of Patent: May 12, 2015
    Assignee: Alpha Technologies Inc.
    Inventors: James Patrick Richardson, Than Quoc Le
  • SWITCHING SYSTEMS AND METHODS FOR USE IN UNINTERRUPTIBLE POWER SUPPLIES
    Publication number: 20120217808
    Abstract: The present invention may be embodied as an uninterruptible power supply comprising an input section, an output section, an inverter section, and a transformer. The transformer is operatively connected to the input section, the output section, and the inverter section. The uninterruptible power supply operates in a line mode and in a standby mode. In the standby mode, the output section generates an output power signal from a standby signal generated by the inverter section based on the alternative power source and at least one inverter control signal. When the uninterruptible power supply operates in the standby mode, the at least one inverter control signal is pulse-width modulated during at least a first portion of a cycle of the output power signal and not pulse-width modulated during at least a second portion of the cycle of the output power signal.
    Type: Application
    Filed: January 17, 2012
    Publication date: August 30, 2012
    Applicant: Alpha Technologies Inc.
    Inventors: James Patrick Richardson, Than Quoc Le