Patents by Inventor Gurcharn S. Dang

Gurcharn S. Dang 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: 4916329
    Abstract: An uninterruptible power supply device uses a transformer with a first primary winding and secondary winding tightly coupled to one another to transmit AC input electrical power to a voltage sensitive load. A series regulator switches taps in the first primary to keep the load output voltage within certain limits during minor variations in the AC input voltage. A standby inverter supplies standby power to the load after a loss or large variation in the AC input voltage by driving PWM pulses into a secondary primary winding of the transformer. The transformer loosely couples the second primary winding to the secondary winding to aid in synthesizing the output sinusoidal wave from the PWM pulses. The regulator opens all of the taps to prevent the inverter from supplying power to the AC input.
    Type: Grant
    Filed: October 5, 1987
    Date of Patent: April 10, 1990
    Assignee: Square D Company
    Inventors: Gurcharn S. Dang, Casey Kuzara
  • Patent number: 4410935
    Abstract: Current overload protection is provided for an inverter of an uninterruptible power supply system; a shutdown circuit responds when a current overload is present, and a plurality of at least three comparators having different input threshold and different time delays at their respective outputs operate such that when an extreme overload occurs, the inverter will be shut down immediately, whereas it will be shut down after predetermined longer periods with correspondingly lesser amounts of current overload present.
    Type: Grant
    Filed: March 23, 1981
    Date of Patent: October 18, 1983
    Assignee: General Signal Corporation
    Inventor: Gurcharn S. Dang