The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 2007
Filed:
Jan. 31, 2005
James Gonzales, Mesa, AZ (US);
Govindasamy Tamizhmani, Gilbert, AZ (US);
Bradley Rogers, Chandler, AZ (US);
Liang-jun Ji, Gilbert, AZ (US);
James Gonzales, Mesa, AZ (US);
Govindasamy Tamizhmani, Gilbert, AZ (US);
Bradley Rogers, Chandler, AZ (US);
Liang-Jun Ji, Gilbert, AZ (US);
Arizona Board of Regents, Tempe, AZ (US);
Abstract
Uninterruptible power supplies (UPSs) are generally discussed herein with particular discussions extended to fuel-cell-based UPSs used in conjunction with DC power supplies for improved operating efficiencies. With a wide voltage DC power supply, a DC-AC inverter may be omitted from the UPS and power from a back up power source, such as a battery or a fuel cell, may be applied directly to the DC power supply without performing two power conversions. The end result is a more efficient system capable of longer operating time.