Patents Assigned to Albar
  • Uninterruptible power supply with dual level voltage input
    Patent number: 5010469
    Abstract: An uninterruptible power supply is disclosed having an inverter that operates on either high voltage d.c. supplied by a line-powered power supply or on low voltage d.c. batteries. With line power, the inverter operates as an H-bridge inverter. With battery power, the battery voltage is applied to a smaller portion of the inverter's transformer primary. The changeover from line to battery power is determined by when an intermediate voltage tapped from the transformer drops below the battery voltage.
    Type: Grant
    Filed: May 9, 1990
    Date of Patent: April 23, 1991
    Assignee: Albar
    Inventor: Howard H. Bobry